WO2015090230A1 - Human mesothelin chimeric antigen receptors and uses thereof - Google Patents
Human mesothelin chimeric antigen receptors and uses thereof Download PDFInfo
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- WO2015090230A1 WO2015090230A1 PCT/CN2014/094393 CN2014094393W WO2015090230A1 WO 2015090230 A1 WO2015090230 A1 WO 2015090230A1 CN 2014094393 W CN2014094393 W CN 2014094393W WO 2015090230 A1 WO2015090230 A1 WO 2015090230A1
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Definitions
- the present invention relates generally to the use of T cells engineered to express a Chimeric Antigen Receptor (CAR) to treat a disease associated with expression of mesothelin.
- CAR Chimeric Antigen Receptor
- the mesothelin gene encodes a precursor 71-kDa protein that is processed to yield the 40-kDa protein, mesothelin, which is anchored at the cell membrane by a glycosylphosphatidyl inositol (GPI) linkage and an amino-terminal 31-kDa shed fragment, called megkaryocyte potentiating factor (MPF) . Both fragments contain N-glycosylation sites.
- GPI glycosylphosphatidyl inositol
- MPF megkaryocyte potentiating factor
- Mesothelin is a differentiation antigen that is also present on normal tissues.
- K1 mouse anti-human mesothelin antibody K1 that was developed by the Pastan group, strong K1 reactivity has been demonstrated within mesothelial cells that line the peritoneal, pleural, and pericardial cavities, although at lower levels than usually seen for malignant tissues.
- Weak K1 reactivity has been detected within the Fallopian tube epithelium, tracheal basal epithelium and tonsils epithelium.
- Mesothelin has also been found on all layers of the cornea. Jirsova K, et al. Experimental eye research.
- K1 reactivity has not been detected in the majority of normal tissues including the liver, kidneys, spleen, bone marrow, lymph nodes, thymus, cardiac muscle, tongue, skeletal muscle, skin, cerebral cortex, cerebellum, spinal cord, peripheral nerve, pituitary, adrenal, salivary gland, mammary gland, thyroid, parathyroid, testis, prostate, epididymis, cervical epithelium, lung parenchyma, esophagus, small-bowel epithelium, colon epithelium, bladder epithelium, gall-bladder epithelium. Chang K, et al., Cancer Res. 1992; 52 (1) : 181-186.
- Mesothelin is a target of a natural immune response in ovarian cancer, and has been proposed to be a target for cancer immunotherapy.
- Bracci L et al. Clin Cancer Res. 2007; 13 (2 Pt 1):644-653; Moschella F, et al. Cancer Res. 2011; 71 (10) : 3528-3539; Gross G, et al. FASEB J. 1992; 6 (15) : 3370-3378; Sadelain M, et al. NatRevCancer. 2003; 3 (1) : 35-45; Muul LM, et al. Blood. 2003; 101 (7) : 2563-2569; Yee C, et al. Proc Natl Acad Sci U S A.
- the invention features, e.g., methods of providing an immune response in patients by administering an immune effector cell that is engineered to express a Chimeric Antigen Receptor (CAR) that comprises an antibody (e.g., scFv) that specifically targets mesothelin.
- CAR Chimeric Antigen Receptor
- the invention pertains to the use of an immune effector cell such as, e.g., a T cell or NK cell, engineered to express a CAR that includes an antibody such as antigen binding fragment thereof to treat a cancer associated with expression of mesothelin (or MSLN) .
- the invention pertains to adoptive cell transfer that may be particularly suitable for patients with mesothelin-expressing cancers, such as, e.g., mesothelioma (e.g., malignant pleural mesothelioma, lung cancer (e.g., non-small cell lung cancer, small cell lung cancer, squamous cell lung cancer, or large cell lung cancer) , pancreatic cancer (e.g., pancreatic ductal adenocarcinoma, pancreatic metatstatic) , ovarian cancer, colorectal cancer and bladder cancer, or any combination thereof.
- mesothelioma e.g., malignant pleural mesothelioma
- lung cancer e.g., non-small cell lung cancer, small cell lung cancer, squamous cell lung cancer, or large cell lung cancer
- pancreatic cancer e.g., pancreatic ductal adenocarcinoma, pancreatic metatstatic
- the invention pertains to an isolated nucleic acid molecule encoding a chimeric antigen receptor (CAR) , wherein the CAR comprises an anti-mesothelin binding domain (e.g., a human anti-mesothelin binding domain) , a transmembrane domain, and an intracellular signaling domain comprising a stimulatory domain.
- CAR chimeric antigen receptor
- the encoded anti-mesothelin binding domain comprises one or more (e.g., all three) light chain complementary determining region 1 (LC CDR1) , light chain complementary determining region 2 (LC CDR2) , and light chain complementary determining region 3 (LC CDR3) of a human anti-mesothelin binding domain described herein, and one or more (e.g., all three) heavy chain complementary determining region 1 (HC CDR1) , heavy chain complementary determining region 2 (HC CDR2) , and heavy chain complementary determining region 3 (HC CDR3) of a human anti-mesothelin binding domain described herein.
- LC CDR1 light chain complementary determining region 1
- HC CDR2 light chain complementary determining region 2
- HC CDR3 heavy chain complementary determining region 3
- the encoded human anti-mesothelin binding domain comprises, or consists of, a light chain variable region described herein (e.g., in Table 2, 4 or 5) and/or a heavy chain variable region described herein (e.g., in Table 2, 4, or 5) .
- the encoded anti-mesothelin binding domain is a scFv comprising or consisting of a light chain and a heavy chain of an amino acid sequence of Table 2.
- the anti-mesothelin binding domain (e.g., an scFV) comprises or consists: a light chain variable region comprising an amino acid sequence having at least one, two or three modifications (e.g., substitutions) but not more than 30, 20 or 10 modifications (e.g., substitutions) of an amino acid sequence of a light chain variable region provided in Table 2, or a sequence with 95-99%identity with an amino acid sequence of Table 2; and/or a heavy chain variable region comprising, or consisting of, an amino acid sequence having at least one, two or three modifications (e.g., substitutions) but not more than 30, 20 or 10 modifications (e.g., substitutions) of an amino acid sequence of a heavy chain variable region provided in Table 2, or a sequence with 95-99%identity to an amino acid sequence of Table 2.
- a light chain variable region comprising an amino acid sequence having at least one, two or three modifications (e.g., substitutions) but not more than 30, 20 or 10 modifications (e.g., substitutions) of an
- the human anti-mesothelin binding domain comprises, or consists of, a sequence selected from the group consisting of SEQ ID NO: 39; SEQ ID NO: 40, SEQ ID NO: 41, SEQ ID NO: 42, SEQ ID NO:43, SEQ ID NO: 44, SEQ ID NO: 45, SEQ ID NO: 46, SEQ ID NO: 47, SEQ ID NO: 48, SEQ ID NO: 49, SEQ ID NO: 50, SEQ ID NO: 51, SEQ ID NO: 52, SEQ ID NO: 53, SEQ ID NO: 54, SEQ ID NO: 55, SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, and SEQ ID NO: 62, or a sequence with 95-99%identity thereof.
- the nucleic acid sequence encoding the human anti-mesothelin binding domain comprises, or consists of, a sequence selected from the group consisting of SEQ ID NO: 87; SEQ ID NO: 88, SEQ ID NO: 89, SEQ ID NO: 90, SEQ ID NO: 91, SEQ ID NO: 92, SEQ ID NO: 93, SEQ ID NO: 94, SEQ ID NO: 95, SEQ ID NO: 96, SEQ ID NO: 97, SEQ ID NO: 98, SEQ ID NO: 99, SEQ ID NO: 100, SEQ ID NO: 101, SEQ ID NO: 102, SEQ ID NO: 103, SEQ ID NO: 104, SEQ ID NO: 105, SEQ ID NO: 106, SEQ ID NO: 107, SEQ ID NO: 108, SEQ ID NO: 109, and SEQ ID NO: 110, or a sequence with 95-99%identify thereof.
- the isolated nucleic acid further comprises a sequence encoding a transmembrane domain, e.g., a transmembrane domain described herein.
- the encoded transmembrane domain comprises, or consists of, a transmembrane domain of a protein selected from the alpha, beta or zeta chain of the T-cell receptor, CD28, CD3 epsilon, CD45, CD4, CD5, CD8, CD9, CD16, CD22, CD33, CD37, CD64, CD80, CD86, CD134, CD137 and CD154.
- the encoded transmembrane domain comprises, or consists of, a sequence of SEQ ID NO: 12.
- the transmembrane domain comprises, or consists of, an amino acid sequence having at least one, two or three modifications (e.g., substitutions) but not more than 20, 10 or 5 modifications (e.g., substitutions) of an amino acid sequence of SEQ ID NO: 12, or a sequence with 95-99%identity to an amino acid sequence of SEQ ID NO: 12.
- the encoded CAR includes an anti-mesothelin binding domain, e.g., an anti-mesothelin binding domain described herein, connected to the transmembrane domain by a hinge region, e.g., a hinge region described herein.
- the hinge region comprises, or consists of, SEQ ID NO: 6 or SEQ ID NO: 8.
- the isolated nucleic acid molecule further comprises a sequence encoding a costimulatory domain, e.g., a costimulatory domain described herein.
- the costimulatory domain is a functional signaling domain obtained from a protein selected from the group consisting of OX40, CD27, CD28, CDS, ICAM-1, LFA-1 (CD11a/CD18) , ICOS (CD278) , and 4-1BB (CD137) .
- the encoded costimulatory domain comprises, or consists of, a sequence of SEQ ID NO: 14.
- the costimulatory domain comprises, or consists of, an amino acid sequence having at least one, two or three modifications (e.g., substitutions) but not more than 20, 10 or 5 modifications (e.g., substitutions) of an amino acid sequence of SEQ ID NO: 14, or a sequence with 95-99%identity to an amino acid sequence of SEQ ID NO: 14.
- the isolated nucleic acid comprises a sequence encoding an intracellular signaling domain, e.g., an intracellular signaling domain described herein.
- the isolated nucleic acid encodes a functional signaling domain of 4-1BB and/or a functional signaling domain of CD3 zeta.
- the encoded intracellular signaling domain comprises the sequence of SEQ ID NO: 7 and/or the sequence of SEQ ID NO: 9 or SEQ ID NO: 10.
- the intracellular signaling domain comprises an amino acid sequence having at least one, two or three modifications (e.g., substitutions) but not more than 20, 10 or 5 modifications (e.g., substitutions) of an amino acid sequence of SEQ ID NO: 7 and/or an amino acid sequence of SEQ ID NO: 9 or SEQ ID NO: 10, or a sequence with 95-99%identity to an amino acid sequence of SEQ ID NO: 7 and/or an amino acid sequence of SEQ ID NO: 9 or SEQ ID NO: 10.
- the encoded intracellular signaling domain comprises, or consists of, the sequence of SEQ ID NO: 7 and the sequence of SEQ ID NO: 9 or SEQ ID NO: 10, wherein the sequences comprising the intracellular signaling domain are expressed in the same frame and as a single polypeptide chain.
- the invention pertains to an isolated nucleic acid molecule encoding a CAR construct comprising a leader sequence, e.g., of SEQ ID NO: 1; an anti-mesothelin binding domain described herein, e.g., having an amino acid sequence of Table 2, or a sequence with 95-99%identify thereof; a hinge region, e.g., of SEQ ID NO: 2; a transmembrane domain, e.g., having a sequence of SEQ ID NO: 6; a costimulatory domain, e.g., a 4-1BB costimulatory domain having a sequence of SEQ ID NO: 7; and a primary signaling domain, e.g., CD3 zeta stimulatory domain having a sequence of SEQ ID NO: 9 or 10.
- a leader sequence e.g., of SEQ ID NO: 1
- an anti-mesothelin binding domain described herein described herein, e.g., having an amino acid sequence of Table 2, or
- the isolated nucleic acid molecule comprises (e.g., consists of) a nucleic acid sequence encoding a polypeptide having an amino acid sequence of Table 2. In one embodiment, the isolated nucleic acid molecule comprises (consists of) a nucleic acid encoding a polypeptide having an amino acid sequence having at least one, two or three modifications (e.g., substitutions) but not more than 30, 20 or 10 modifications (e.g., substitutions) of an amino acid sequence of Table 2, or a sequence with 95-99%identity to an amino acid sequence of Table 2.
- the invention pertains to an isolated polypeptide molecule encoded by the nucleic acid sequence, e.g., a nucleic acid described herein.
- the invention pertains to an isolated polypeptide molecule comprising, or consisting of, a sequence selected from the group consisting of Table 2, an amino acid sequence having at least one, two or three modifications (e.g., substitutions) but not more than 30, 20 or 10 modifications (e.g., substitutions) of an amino acid sequence of a heavy chain variable region provided in Table 2, or a sequence with 95-99%identity to an amino acid sequence of Table 2.
- the isolated polypeptide comprises one or more (e.g., all three) light chain complementary determining region 1 (LC CDR1) , light chain complementary determining region 2 (LC CDR2) , and light chain complementary determining region 3 (LC CDR3) of a human anti-mesothelin binding domain described herein, and one or more (e.g., all three) heavy chain complementary determining region 1 (HC CDR1) , heavy chain complementary determining region 2 (HC CDR2) , and heavy chain complementary determining region 3 (HC CDR3) of a human anti-mesothelin binding domain described herein.
- LC CDR1 light chain complementary determining region 1
- HC CDR2 light chain complementary determining region 2
- HC CDR3 heavy chain complementary determining region 3
- the invention pertains to an isolated chimeric antigen receptor (CAR) molecule comprising an anti-mesothelin binding domain described herein, e.g., a human anti-mesothelin binding domain described herein, a transmembrane domain, and an intracellular signaling domain comprising a stimulatory domain.
- CAR chimeric antigen receptor
- the anti-mesothelin binding domain does not compete for binding to human mesothelin with an antigen binding domain comprising a sequence comprising SEQ ID NO: 279.
- the anti-mesothelin binding domain competes for binding to human mesothelin with an antigen binding domain comprising a LC CDR1, LC CDR2 and LC CDR3 of an anti-mesothelin light chain amino acid sequence selected from SEQ ID NO: 43 or SEQ ID NO: 49 and an HC CDR1, HC CDR2, and HC CDR3 of an anti-mesothelin heavy chain amino acid sequence selected from SEQ ID NO: 43 or SEQ ID NO: 49.
- the anti-mesothelin binding domain competes for binding to human mesothelin with an antigen binding domain comprising SEQ ID NO: 43 or SEQ ID NO: 49.
- the anti-mesothelin binding domain binds to a different epitope of human mesothelin than the epitope of human mesothelin targeted by the antigen binding domain comprising a sequence comprising SEQ ID NO: 279.
- the epitope comprises a sequence of amino acids selected from amino acids 314-315, 317-318, 346-349, and 369-375 of SEQ ID NO: 278, or any combination thereof.
- the epitope comprises one or more amino acids selected from amino acids 314-315, 317-318, 346-349, and 369-375 of SEQ ID NO: 278, or any combination thereof.
- the anti-mesothelin binding domain described herein does not bind to the N-terminus of mesothelin as shown in SEQ ID NO: 278. In one embodiment, the anti-mesothelin binding domain binds to the C-terminus of human mesothelin. In one embodiment, the anti-mesothelin binding domain binds an epitope within amino acids 450-588 of SEQ ID NO: 278. In one embodiment, the epitope bound by the anti-mesothelin binding domain comprises a sequence selected from amino acids 485-490, 498-507, 532-537, and 545-572 of SEQ ID NO: 278, or a combination thereof.
- the epitope bound by the anti-mesothelin binding domain comprises one or more amino acids selected from amino acids 485-490, 498-507, 532-537, and 545-572 of SEQ ID NO: 278, or any combination thereof.
- SEQ ID NO: 278 represents amino acids 296-588 of human mesothelin, e.g., the first amino acid of SEQ ID NO: 278 is amino acid 296 and the last amino acid of SEQ ID NO: 278 is amino acid 588.
- the anti-mesothelin binding domain comprises one or more (e.g., all three) light chain complementary determining region 1 (LC CDR1) , light chain complementary determining region 2 (LC CDR2) , and light chain complementary determining region 3 (LC CDR3) of a human anti-mesothelin binding domain described herein, and one or more (e.g., all three) heavy chain complementary determining region 1 (HC CDR1) , heavy chain complementary determining region 2 (HC CDR2) , and heavy chain complementary determining region 3 (HC CDR3) of a human anti-mesothelin binding domain described herein.
- LC CDR1 light chain complementary determining region 1
- HC CDR2 light chain complementary determining region 2
- HC CDR3 heavy chain complementary determining region 3
- the human anti-mesothelin binding domain comprises, or consists of, a light chain variable region described herein (e.g., in Table 2) and/or a heavy chain variable region described herein (e.g., in Table 2) .
- the anti-mesothelin binding domain is a scFv comprising, or consisting of, a light chain variable region and a heavy chain variable region of an amino acid sequence of Table 2.
- the anti-mesothelin binding domain (e.g., an scFV) comprises, or consists of: a light chain variable region comprising an amino acid sequence having at least one, two or three modifications (e.g., substitutions) but not more than 30, 20 or 10 modifications (e.g., substitutions) of an amino acid sequence of a light chain variable region provided in Table 2, or a sequence with 95-99%identity to an amino acid sequence of Table 2; and/or a heavy chain variable region comprising an amino acid sequence having at least one, two or three modifications (e.g., substitutions) but not more than 30, 20 or 10 modifications (e.g., substitutions) of an amino acid sequence of a heavy chain variable region provided in Table 2, or a sequence with 95-99%identity to an amino acid sequence of Table 2.
- a light chain variable region comprising an amino acid sequence having at least one, two or three modifications (e.g., substitutions) but not more than 30, 20 or 10 modifications (e.g., substitutions) of an amino acid sequence of
- the human anti-mesothelin binding domain comprises, or consists of, a sequence selected from the group consisting of SEQ ID NO: 39; SEQ ID NO: 40, SEQ ID NO: 41, SEQ ID NO: 42, SEQ ID NO:43, SEQ ID NO: 44, SEQ ID NO: 45, SEQ ID NO: 46, SEQ ID NO: 47, SEQ ID NO: 48, SEQ ID NO: 49, SEQ ID NO: 50, SEQ ID NO: 51, SEQ ID NO: 52, SEQ ID NO: 53, SEQ ID NO: 54, SEQ ID NO: 55, SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, and SEQ ID NO: 62, or a sequence with 95-99%identity thereof.
- the transmembrane domain is a transmembrane domain of a protein selected from the group consisting of the alpha, beta or zeta chain of the T-cell receptor, CD28, CD3 epsilon, CD45, CD4, CD5, CD8, CD9, CD16, CD22, CD33, CD37, CD64, CD80, CD86, CD134, CD137 and CD154.
- the transmembrane domain comprises a transmembrane domain described herein, e.g., having a sequence of SEQ ID NO: 6, an amino acid sequence having at least one, two or three modifications (e.g., substitutions) but not more than 20, 10 or 5 modifications (e.g., substitutions) of an amino acid sequence of SEQ ID NO: 6, or a sequence with 95-99%identity to an amino acid sequence of SEQ ID NO: 6.
- the anti-mesothelin binding domain is connected to the transmembrane domain by a hinge region.
- the hinge region comprises a hinge region described herein, e.g., a hinge region of SEQ ID NO: 2.
- the isolated CAR molecule further comprises a costimulatory domain, e.g., a costimulatory domain described herein.
- the costimulatory domain is a functional signaling domain obtained from a protein selected from the group consisting of OX40, CD27, CD28, CDS, ICAM-1, LFA-1 (CD11a/CD18) , ICOS (CD278) , and 4-1BB (CD137) or functional variant thereof.
- the costimulatory domain comprises, or consists of, a sequence of SEQ ID NO: 7.
- the costimulatory domain comprises, or consists of, an amino acid sequence having at least one, two or three modifications (e.g., substitutions) but not more than 20, 10 or 5 modifications (e.g., substitutions) of an amino acid sequence of SEQ ID NO: 7, or a sequence with 95-99%identity to an amino acid sequence of SEQ ID NO: 7.
- the isolated CAR molecule comprises an intracellular signaling domain, e.g., an intracellular signaling domain described herein.
- the intracellular signaling domain comprises a functional signaling domain of 4-1BB and/or a functional signaling domain of CD3 zeta.
- the intracellular signaling domain comprises, or consists of, the sequence of SEQ ID NO: 7 and/or the sequence of SEQ ID NO: 9 or SEQ ID NO: 10.
- the intracellular signaling domain comprises, or consists of, an amino acid sequence having at least one, two or three modifications (e.g., substitutions) but not more than 20, 10 or 5modifications (e.g., substitutions) of an amino acid sequence of SEQ ID NO: 7 and/or an amino acid sequence of SEQ ID NO: 9 or SEQ ID NO: 10, or a sequence with 95-99%identity to an amino acid sequence of SEQ ID NO: 7 and/or an amino acid sequence of SEQ ID NO: 9 or SEQ ID NO: 10.
- the intracellular signaling domain comprises, or consists of, the sequence of SEQ ID NO: 9 and the sequence of SEQ ID NO: 9 or SEQ ID NO: 10, wherein the sequences comprising the intracellular signaling domain are expressed in the same frame and as a single polypeptide chain.
- the invention pertains to an isolated CAR molecule comprising a leader sequence, e.g., of SEQ ID NO: 1; an anti-mesothelin binding domain described herein, e.g., having an amino acid sequence of Table 2, or a sequence with 95-99%identify thereof; a hinge region, e.g., of SEQ ID NO: 2; a transmembrane domain, e.g., having a sequence of SEQ ID NO: 6; a costimulatory domain, e.g., a 4-1BB costimulatory domain having a sequence of SEQ ID NO: 7; and a primary signaling domain, e.g., CD3 zeta stimulatory domain having a sequence of SEQ ID NO: 9 or SEQ ID NO: 10.
- a leader sequence e.g., of SEQ ID NO: 1
- an anti-mesothelin binding domain described herein described herein, e.g., having an amino acid sequence of Table 2, or a sequence with 95-
- the isolated CAR molecule comprises (e.g., consists of) a polypeptide having an amino acid sequence of Table 2. In one embodiment, the isolated CAR molecule comprises (consists of) a polypeptide having an amino acid sequence having at least one, two or three modifications (e.g., substitutions) but not more than 30, 20 or 10 modifications (e.g., substitutions) of an amino acid sequence of Table 2, or a sequence with 95-99%identity to an amino acid sequence of Table 2.
- the isolated CAR molecule comprises, or consists of, an amino acid sequence selected from the group consisting of SEQ ID NO: 63; SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO:67, SEQ ID NO: 68, SEQ ID NO: 69, SEQ ID NO: 70, SEQ ID NO: 71, SEQ ID NO: 72, SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO:78, SEQ ID NO: 79, SEQ ID NO: 80, SEQ ID NO: 81, SEQ ID NO: 82, SEQ ID NO: 83, SEQ ID NO: 84, SEQ ID NO: 85, and SEQ ID NO: 86.
- the invention pertains to a vector comprising a nucleic acid sequence described herein.
- the nucleic acid sequence encodes a CAR molecule, e.g., a CAR molecule described herein.
- the vector is selected from the group consisting of a DNA, a RNA, a plasmid, a lentivirus vector, adenoviral vector, or a retrovirus vector.
- the vector is a lentivirus vector, e.g., a lentivirus vector described herein.
- the vector further comprises a promoter.
- the promoter is an EF-1 ⁇ promoter.
- the EF-1 ⁇ promoter comprises a sequence of SEQ ID NO: 11.
- the vector is an in vitro transcribed vector, e.g., a vector that transcribes RNA of a nucleic acid molecule described herein.
- the RNA is transcribed from an in vitro transcription vector, wherein the vector is pD-A. anti-meso BD OF. 2bg. 150A, wherein the anti-meso BD is an anti-mesothelin binding domain described herein.
- the nucleic acid sequence in the vector further comprises a poly (A) tail, e.g., a poly A tail described herein, e.g., comprising about 150 adenosine bases (SEQ ID NO: 271) .
- the nucleic acid sequence in the vector further comprises a 3’UTR, e.g., a 3’UTR described herein, e.g., comprising at least one repeat of a 3’UTR derived from human beta-globulin.
- a 3’UTR e.g., a 3’UTR described herein, e.g., comprising at least one repeat of a 3’UTR derived from human beta-globulin.
- the invention pertains to a cell comprising the vector.
- the cell can be, e.g., a cell described herein.
- the cell is a human T cell, e.g., a T cell described herein, or a human NK cell, e.g., a human NK cell described herein.
- the human T cell is a CD8+ T cell.
- the cell is an autologous T cell.
- the cell is an allogeneic T cell.
- the cell is a T cell and the T cell is diaglycerol kinase (DGK) deficient.
- the cell is a T cell and the T cell is Ikaros deficient.
- the cell is a T cell and the T cell is both DGK and Ikaros deficient.
- the CAR-expressing cell described herein can further comprise a second CAR, e.g., a second CAR that includes a different antigen binding domain, e.g., to the same target (mesothelin) or a different target (e.g., a target other than mesothelin on stroma cells, e.g., FAP; a target other than mesothelin on prostate cancer cells, e.g., androgen receptor, OR51E2, PSMA, PSCA, PDGRF- ⁇ , TARP, GloboH, MAD-CT-1, or MAD-CT-2; a target other than mesothelin on ovararian cancer cells, e.g., Tn, PRSS21, CD171, Lewis Y, folate receptor ⁇ , claudin6, GloboH, or sperm protein 17; e.g., a target other than mesothelin on lung cancer cells, e.g., VEGF
- the CAR-expressing cell comprises a first CAR that targets a first antigen and includes an intracellular signaling domain having a costimulatory signaling domain but not a primary signaling domain, and a second CAR that targets a second, different, antigen and includes an intracellular signaling domain having a primary signaling domain but not a costimulatory signaling domain.
- the CAR expressing cell comprises a first mesothelin CAR that includes a mesothelin binding domain, a transmembrane domain and a costimulatory domain and a second CAR that targets an antigen other than mesothelin (e.g., an antigen expressed on stroma cells, lung cancer cells, prostate cancer cells or ovarian cancer cells) and includes an antigen binding domain, a transmembrane domain and a primary signaling domain.
- an antigen other than mesothelin e.g., an antigen expressed on stroma cells, lung cancer cells, prostate cancer cells or ovarian cancer cells
- the CAR expressing cell comprises a first mesothelin CAR that includes a mesothelin binding domain, a transmembrane domain and a primary signaling domain and a second CAR that targets an antigen other than mesothelin (e.g., an antigen expressed on stroma cells, lung cancer cells, prostate cancer cells or ovarian cancer cells) and includes an antigen binding domain to the antigen, a transmembrane domain and a costimulatory signaling domain.
- an antigen other than mesothelin e.g., an antigen expressed on stroma cells, lung cancer cells, prostate cancer cells or ovarian cancer cells
- the CAR-expressing cell comprises a mesothelin CAR described herein and an inhibitory CAR.
- the inhibitory CAR comprises an antigen binding domain that binds an antigen found on normal cells but not cancer cells, e.g., normal cells that also express mesothelin.
- the inhibitory CAR comprises the antigen binding domain, a transmembrane domain and an intracellular domain of an inhibitory molecule.
- the intracellular domain of the inhibitory CAR can be an intracellular domain of PD1, PD-L1, CTLA4, TIM3, CEACAM (e.g., CEACAM-1, CEACAM-3 and/or CEACAM-5) , LAG3, VISTA, BTLA, TIGIT, LAIR1, CD160, 2B4 and TGFR beta.
- CEACAM e.g., CEACAM-1, CEACAM-3 and/or CEACAM-5
- LAG3, VISTA BTLA
- TIGIT LAIR1, CD160, 2B4 and TGFR beta.
- the CAR-expressing cell described herein can further express another agent, e.g., an agent which enhances the activity or fitness of a CAR-expressing cell, e.g., an agent described herein.
- the agent can be an agent which inhibits a molecule that modulates or regulates, e.g., inhibits, T cell function.
- the molecule that modulates or regulates T cell function is an inhibitory molecule.
- inhibitory molecules include PD1, PD-L1, CTLA4, TIM3, CEACAM (e.g., CEACAM-1, CEACAM-3 and/or CEACAM-5) , LAG3, VISTA, BTLA, TIGIT, LAIR1, CD160, 2B4 and TGFR beta.
- an agent e.g., an inhibitory nucleic acid, e.g., a dsRNA, e.g., an siRNA or shRNA; or e.g., an inhibitory protein or system, e.g., a clustered regularly interspaced short palindromic repeats (CRISPR) , a transcription-activator like effector nuclease (TALEN) , or a zinc finger endonuclease (ZFN) , e.g., as described herein, can be used to inhibit expression of a molecule that modulates or regulates, e.g., inhibits, T-cell function in the CAR-expressing cell.
- CRISPR clustered regularly interspaced short palindromic repeats
- TALEN transcription-activator like effector nuclease
- ZFN zinc finger endonuclease
- the agent is an shRNA, e.g., an shRNA described herein.
- the agent that modulates or regulates, e.g., inhibits, T-cell function is inhibited within a CAR-expressing cell.
- a dsRNA molecule that inhibits expression of a molecule that modulates or regulates, e.g., inhibits, T-cell function is linked to the nucleic acid that encodes a component, e.g., all of the components, of the CAR.
- the agent which inhibits an inhibitory molecule comprises a first polypeptide, e.g., an inhibitory molecule, associated with a second polypeptide that provides a positive signal to the cell, e.g., an intracellular signaling domain described herein.
- the agent comprises a first polypeptide, e.g., of an inhibitory molecule such as PD1, PD-L1, CEACAM (e.g., CEACAM-1, CEACAM-3 and/or CEACAM-5) , LAG3, CTLA4, , VISTA, CD160, BTLA, LAIR1, TIM3, 2B4, TGFR beta and TIGIT, or a fragment of any of these (e.g., at least a portion of the extracellular domain of any of these) , and a second polypeptide which is an intracellular signaling domain described herein (e.g., comprising a costimulatory domain (e.g., 41BB, CD27 or CD28, e.g., as described herein) and/or a primary signaling domain (e.g., a CD3 zeta signaling domain described herein) ) .
- an inhibitory molecule such as PD1, PD-L1, CEACAM (e.g., CEACAM-1, CEA
- the agent comprises a first polypeptide of PD1 or a fragment thereof (e.g., at least a portion of the extracellular domain of PD1) , and a second polypeptide of an intracellular signaling domain described herein (e.g., a CD28 signaling domain described herein and/or a CD3 zeta signaling domain described herein) .
- a first polypeptide of PD1 or a fragment thereof e.g., at least a portion of the extracellular domain of PD1
- a second polypeptide of an intracellular signaling domain described herein e.g., a CD28 signaling domain described herein and/or a CD3 zeta signaling domain described herein
- the invention pertains to a method of making a cell comprising transducing a cell described herein, e.g., a T cell or a NK cell, with a vector of comprising a nucleic acid encoding a CAR molecule, e.g., a CAR molecule described herein.
- the vector is a lentiviral vector described herein.
- the present invention also provides a method of generating a population of RNA-engineered cells, e.g., cells described herein, e.g., T cells or NK cells, transiently expressing exogenous RNA.
- the method comprises introducing an in vitro transcribed RNA or synthetic RNA into a cell, where the RNA comprises a nucleic acid encoding a CAR molecule described herein.
- the invention pertains to a method of providing anti-tumor immunity in a subject comprising administering to the subject an effective amount of a cell comprising a CAR molecule, e.g., a cell expressing a CAR molecule described herein, a cell described herein.
- a cell comprising a CAR molecule, e.g., a cell expressing a CAR molecule described herein, a cell described herein.
- the cell is an autologous T cell or NK cell.
- the cell is an allogeneic T cell or NK cell.
- the subject is a human.
- the invention pertains to a method of treating a subject having a disease associated with expression of mesothelin (e.g., a proliferative disease, a precancerous condition, and a noncancer related indication associated with the expression of mesothelin) comprising administering to the subject an effective amount of a cell comprising a CAR molecule, e.g., as described herein.
- a disease associated with expression of mesothelin e.g., a proliferative disease, a precancerous condition, and a noncancer related indication associated with the expression of mesothelin
- the disease associated with mesothelin is cancer, e.g., a cancer described herein.
- the disease associated with mesothelin is selected from the group consisting of: mesothelioma (e.g., malignant pleural mesothelioma) , lung cancer (e.g., non-small cell lung cancer, small cell lung cancer, squamous cell lung cancer, or large cell lung cancer) , pancreatic cancer (e.g., pancreatic ductal adenocarcinoma) , ovarian cancer, colorectal cancer and bladder cancer or any combination thereof.
- mesothelioma e.g., malignant pleural mesothelioma
- lung cancer e.g., non-small cell lung cancer, small cell lung cancer, squamous cell lung cancer, or large cell lung cancer
- pancreatic cancer e.g., pancreatic ductal adenocarcinoma
- the disease is pancreatic cancer, e.g., metastatic pancreatic ductal adenocarcinoma (PDA) , e.g., in a subject who has progressed on at least one prior standard therapy.
- the disease is mesothelioma (e.g., malignant pleural mesothelioma) , e.g., in a subject who has progressed on at least one prior standard therapy.
- the disease is ovarian cancer, e.g., serous epithelial ovarian cancer, e.g., in a subject who has progressed after at least one prior regimen of standard therapy.
- the mesothelin CAR expressing cell e.g., T cell or NK cell
- the cells expressing a CAR molecule are administered in combination with an agent that enhances the activity or fitness of a cell expressing a CAR molecule, e.g., an agent described herein.
- the cells expressing a CAR molecule are administered in combination with a low, immune enhancing dose of an mTOR inhibitor.
- a low, immune enhancing, dose e.g., a dose that is insufficient to completely suppress the immune system but sufficient to improve immune function
- treatment with a low, immune enhancing, dose is accompanied by a decrease in PD-1 positive T cells or an increase in PD-1 negative cells.
- PD-1 positive T cells, but not PD-1 negative T cells can be exhausted by engagement with cells which express a PD-1 ligand, e.g., PD-L1 or PD-L2.
- this approach can be used to optimize the performance of CAR cells described herein in the subject. While not wishing to be bound by theory, it is believed that, in an embodiment, the performance of endogenous, non-modified immune effector cells, e.g., T cells, is improved. While not wishing to be bound by theory, it is believed that, in an embodiment, the performance of a mesothelin CAR expressing cell is improved.
- cells e.g., T cells or NK cells, which have, or will be engineered to express a CAR
- an mTOR inhibitor that increases the number of PD1 negative immune effector cells, e.g., T cells or increases the ratio of PD1 negative immune effector cells, e.g., T cells/PD1 positive immune effector cells, e.g., T cells.
- administering is initiated prior to administration of an CAR expressing cell described herein, e.g., T cells or NK cells.
- an mTOR inhibitor e.g., an allosteric inhibitor, e.g., RAD001, or a catalytic inhibitor
- the CAR cells are administered after a sufficient time, or sufficient dosing, of an mTOR inhibitor, such that the level of PD1 negative immune effector cells, e.g., T cells, or the ratio of PD1 negative immune effector cells, e.g., T cells/PD1 positive immune effector cells, e.g., T cells, has been, at least transiently, increased.
- the cell e.g., T cell or NK cell, to be engineered to express a CAR
- the cell is harvested after a sufficient time, or after sufficient dosing of the low, immune enhancing, dose of an mTOR inhibitor, such that the level of PD1 negative immune effector cells, e.g., T cells, or the ratio of PD1 negative immune effector cells, e.g., T cells/PD1 positive immune effector cells, e.g., T cells, in the subject or harvested from the subject has been, at least transiently, increased.
- the cells expressing a CAR molecule are administered in combination with an agent that ameliorates one or more side effect associated with administration of a cell expressing a CAR molecule, e.g., an agent described herein.
- the cells expressing a CAR molecule e.g., a CAR molecule
- an agent that treats the disease associated with mesothelin expression e.g., an agent described herein.
- the cells expressing a CAR molecule are administered at a dose and/or dosing schedule described herein.
- the cells expressing a CAR molecule are administered as a first line treatment for the disease, e.g., the cancer, e.g., the cancer described herein.
- the cells expressing a CAR molecule are administered as a second, third, fourth line treatment for the disease, e.g., the cancer, e.g., the cancer described herein.
- a population of cells described herein is administered.
- the CAR molecule is introduced into T cells or NK cells, e.g., using in vitro transcription, and the subject (e.g., human) receives an initial administration of cells comprising a CAR molecule, and one or more subsequent administrations of cells comprising a CAR molecule, wherein the one or more subsequent administrations are administered less than 15 days, e.g., 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, or 2 days after the previous administration.
- more than one administration of cells comprising a CAR molecule are administered to the subject (e.g., human) per week, e.g., 2, 3, or 4 administrations of cells comprising a CAR molecule are administered per week.
- the subject receives more than one administration of cells comprising a CAR molecule per week (e.g., 2, 3 or 4 administrations per week) (also referred to herein as a cycle) , followed by a week of no administration of cells comprising a CAR molecule, and then one or more additional administration of cells comprising a CAR molecule (e.g., more than one administration of the cells comprising a CAR molecule per week) is administered to the subject.
- the subject receives more than one cycle of cells comprising a CAR molecule, and the time between each cycle is less than 10, 9, 8, 7, 6, 5, 4, or 3 days.
- the cells comprising a CAR molecule are administered every other day for 3 administrations per week.
- the cells comprising a CAR molecule are administered for at least two, three, four, five, six, seven, eight or more weeks.
- the invention includes a population of autologous or allogenic cells that are transfected or transduced with a vector comprising a nucleic acid molecule encoding a mesothelin-CAR molecule, e.g., as described herein.
- the vector is a retroviral vector.
- the vector is a self-inactivating lentiviral vector as described elsewhere herein.
- the vector is delivered (e.g., by transfecting or electroporating) to a cell, e.g., a T cell or a NK cell, wherein the vector comprises a nucleic acid molecule encoding a mesothelin CAR molecule as described herein, which is transcribed as an mRNA molecule, and the mesothelin CAR molecule is translated from the RNA molecule and expressed on the surface of the cell.
- a cell e.g., a T cell or a NK cell
- the vector comprises a nucleic acid molecule encoding a mesothelin CAR molecule as described herein, which is transcribed as an mRNA molecule, and the mesothelin CAR molecule is translated from the RNA molecule and expressed on the surface of the cell.
- the present invention provides a population of CAR-expressing cells, e.g., CART cells.
- the population of CAR-expressing cells comprises a mixture of cells expressing different CARs.
- the population of CART cells can include a first cell expressing a CAR having an anti-mesothelin binding domain described herein, and a second cell expressing a CAR having a different anti-mesothelin binding domain, e.g., an anti-mesothelin binding domain described herein that differs from the anti-mesothelin binding domain in the CAR expressed by the first cell.
- the population of CAR-expressing cells can include a first cell expressing a CAR that includes an anti-mesothelin binding domain, e.g., as described herein, and a second cell expressing a CAR that includes an antigen binding domain to a target other than mesothelin (e.g., a target other than mesothelin on stroma cells, e.g., FAP; a target other than mesothelin on prostate cancer cells, e.g., androgen receptor, OR51E2, PSMA, PSCA, PDGRF- ⁇ , TARP, GloboH, MAD-CT-1, or MAD-CT-2; a target other than mesothelin on ovararian cancer cells, e.g., Tn, PRSS21, CD171, Lewis Y, folate receptor ⁇ , claudin6, GloboH, or sperm protein 17; e.g., a target other than mesothelin on a target
- the present invention provides a population of cells wherein at least one cell in the population expresses a CAR having an anti-mesothelin binding domain described herein, and a second cell expressing another agent, e.g., an agent which enhances the activity or function of a CAR-expressing cell.
- the agent can be an agent which inhibits a molecule that modulates or regulates, e.g., inhibits, T cell function.
- the molecule that modulates or regulates T cell function is an inhibitory molecule, e.g., an agent described herein.
- inhibitory molecules include PD1, PD-L1, CTLA4, TIM3, CEACAM (e.g., CEACAM-1, CEACAM-3 and/or CEACAM-5) , LAG3, VISTA, BTLA, TIGIT, LAIR1, CD160, 2B4 and TGFR beta.
- CEACAM e.g., CEACAM-1, CEACAM-3 and/or CEACAM-5
- LAG3, VISTA, BTLA, TIGIT, LAIR1, CD160, 2B4 and TGFR beta examples include PD1, PD-L1, CTLA4, TIM3, CEACAM (e.g., CEACAM-1, CEACAM-3 and/or CEACAM-5) , LAG3, VISTA, BTLA, TIGIT, LAIR1, CD160, 2B4 and TGFR beta.
- an agent e.g., an inhibitory nucleic acid, e.g., a dsRNA, e.g., an siRNA or shRNA; or e.g., an inhibitory protein or system, e.g., a clustered regularly interspaced short palindromic repeats (CRISPR) , a transcription-activator like effector nuclease (TALEN) , or a zinc finger endonuclease (ZFN) , e.g., as described herein, can be used to inhibit expression of a molecule that modulates or regulates, e.g., inhibits, T-cell function in the CAR-expressing cell.
- CRISPR clustered regularly interspaced short palindromic repeats
- TALEN transcription-activator like effector nuclease
- ZFN zinc finger endonuclease
- the agent is an shRNA, e.g., an shRNA described herein.
- the agent that modulates or regulates, e.g., inhibits, T-cell function is inhibited within a CAR-expressing cell.
- a dsRNA molecule that inhibits expression of a molecule that modulates or regulates, e.g., inhibits, T-cell function is linked to the nucleic acid that encodes a component, e.g., all of the components, of the CAR.
- the agent which inhibits an inhibitory molecule comprises a first polypeptide, e.g., an inhibitory molecule, associated with a second polypeptide that provides a positive signal to the cell, e.g., an intracellular signaling domain described herein.
- the agent comprises a first polypeptide, e.g., of an inhibitory molecule such as PD1, PD-L1, CEACAM (e.g., CEACAM-1, CEACAM-3 and/or CEACAM-5) , LAG3, CTLA4, , VISTA, CD160, BTLA, LAIR1, TIM3, 2B4, TGFR beta and TIGIT, or a fragment of any of these (e.g., at least a portion of an extracellular domain of any of these) , and a second polypeptide which is an intracellular signaling domain described herein (e.g., comprising a costimulatory domain (e.g., 41BB, CD27 or CD28, e.g., as described herein) and/or a primary signaling domain (e.g., a CD3 zeta signaling domain described herein) .
- an inhibitory molecule such as PD1, PD-L1, CEACAM (e.g., CEACAM-1, CEACAM-3
- the agent comprises a first polypeptide of PD1 or a fragment thereof (e.g., at least a portion of the extracellular domain of PD1) , and a second polypeptide of an intracellular signaling domain described herein (e.g., a CD28 signaling domain described herein and/or a CD3 zeta signaling domain described herein) .
- a first polypeptide of PD1 or a fragment thereof e.g., at least a portion of the extracellular domain of PD1
- a second polypeptide of an intracellular signaling domain described herein e.g., a CD28 signaling domain described herein and/or a CD3 zeta signaling domain described herein
- the nucleic acid molecule encoding a mesothelin CAR molecule is expressed as an mRNA molecule.
- the genetically modified mesothelin CAR-expressing cells e.g., T cells or NK cells, can be generated by transfecting or electroporating an RNA molecule encoding the desired CARs (e.g., without a vector sequence) into the cell.
- a mesothelin CAR molecule is translated from the RNA molecule once it is incorporated and expressed on the surface of the recombinant cell.
- the invention pertains to the isolated nucleic acid molecule encoding a CAR molecule, e.g., a CAR molecule described herein, a CAR molecule described herein, a vector comprising a CAR molecule described herein, and/or a cell comprising a CAR molecule described herein for use as a medicament.
- a CAR molecule e.g., a CAR molecule described herein, a CAR molecule described herein, a vector comprising a CAR molecule described herein, and/or a cell comprising a CAR molecule described herein for use as a medicament.
- the invention pertains to a the isolated nucleic acid molecule encoding a CAR molecule described herein, a CAR molecule described herein, a vector comprising a CAR molecule described herein, and/or a cell comprising a CAR molecule described herein for use in the treatment of a disease expressing mesothelin, e.g., as described herein.
- FIG. 1 is a schematic of the pD-A. anti-meso BD. OF. BBZ. 2bg. 150A plasmid.
- Figure discloses "150A” as SEQ ID NO: 271.
- FIG. 2 depicts cell manufacturing and treatment schedules that can be used.
- A Autologous cells are obtained by leukocyte apheresis and T cells are enriched by expansion with anti-CD3/CD28 mAb coated magnetic beads. Cells are expanded for 8 to 12 days. On the last day of culture, the beads are removed using a magnetic field and the cells are washed, electroporated with human meso CAR mRNA construct, and cryopreserved in infusible medium.
- B Three treatment infusion schedules are depicted. On Schedule 1, patients receive 1x10 8 human meso bearing CART cells by intravenous (i.v.) infusion on day 0 followed by 1x10 9 human meso bearing CART cells one week later.
- Safety can be monitored for a minimum of one month before patients are eligible for Schedule 2.
- patients receive 1x10 8 human meso bearing CART cells by i.v.infusion three times per week for one week followed by one week of rest and then 1x10 9 human meso bearing CART cells administered three times per week for one week.
- patients receive 3x10 8 /m 2 human meso bearing CART cells by i.v.infusion three times per week for three weeks followed by intra-tumoral injection into a primary lesion of 2x10 8 human meso bearing CART cells on days +35 and +57.
- FIG. 3A and 3B are graphic representations of cytotoxicity as assayed donor 2 (healthy donor) T cell transduced with mouse SS1 CAR or the anti-MSLN CARs M1 to M12 of the invention and cultured with either control K562 cells that do not express MSLN as shown in FIG. 3A, or K562 cells transduced to express MSLN (K562-Meso) as shown in FIG. 3B.
- FIG. 4A and 4B are graphs showing the IFN ⁇ secretion of the mouse SS1and CD19 CART and the anti-MSLN CARTs upon stimulation by MSLN+ cells.
- FIG. 4A shows reactivity to the transduced cell line K562-Meso and its MSLN-negative parental line K562.
- FIG. 4B shows reactivity toward cancer cells naturally expressing MSLN; the ovarian cancer line Ovcar8 and the pancreatic cancer lines SW1990 and Panc0203.
- FIG. 5 shows a clinical trial design for mesothelin CARTs made by transducing a CAR construct with a lentiviral vector.
- FIG. 6A, 6B, 6C, and 6D show anti-tumor activity of CART-meso cells.
- FIG. 7A, 7B, and 7C show the in vivo persistence of CARTmeso cells and trafficking to primary and metastatic tumor sites.
- FIG. 8 shows cytokine and chemokines in the serum after CARTmeso cell infusion.
- FIG. 9A and 9B show CARTmeso cell induction of anti-tumor antibodies.
- Sera was obtained from the MPM patient (FIG. 9A) and the pancreatic cancer patient (FIG. 9B) .
- FIG. 10 shows tumor growth in NSG mice injected with EMMESO tumor cells.After tumors grew to ⁇ 200 mm 3 in size, mesoCAR T cells were injected via tail vein and measured for 39 days post injection.
- FIG. 11A and 11B show the expression of mesoCAR by flow cytometry analysis at the time of injection (FIG. 11A) or after 40 days at the time of harvest from xenograft tumors.
- FIG. 12 shows the functional capacity of mesoCAR T cells with regard to in vitro killing when isolated from the flank of NSG mice after 39 days, or cryo preserved after transduction.
- FIG. 13 shows the expression of inhibitor enzymes DGK and SHP1 in TILs isolated from EMESO flank tumor compared to overnight-rested TILs.
- FIG. 14A, 14B, 14C, 14D, 14E, and 14F show the effect of treatment with inhibitors (anti-PDL1, DGK inhibitor, and SSG) of inhibitory mechanisms that downregulate mesoCART function on tumor cell killing (FIG. 14A, 14C and 14E) and IFNgamma cytokine secretion (FIG. 14B, 14C, and 14F) .
- inhibitors anti-PDL1, DGK inhibitor, and SSG
- FIG. 15A, 15B, 15C, and 15D show cytokine secretion from a small panel of human CART-MSLN after stimulation with various tumor cell lines.
- FIG. 15A shows IFNgamma secretion.
- FIG. 15B shows TNF.
- FIG. 15C shows IL-2.
- FIG. 15D shows IL-4.
- FIG. 16A and 16B show the results of the killing assay of CART-MSLN-5, CART-MSLN-11, CART-MSLN17, and murine CART-MSLN-SS1 against Ovcar3 (FIG. 16A) and U87mg (FIG. 16B) tumor cells.
- FIG. 17A and 17B show the results of the killing assay of the panel of CART-MSLN against Ovcar3 tumor cells.
- FIG. 18 shows the anti-tumor activity of a first set of CART-MSLN (including M5, M11, M17, and M21) in the Ovcar8 xenograft model.
- FIG. 19 shows the anti-tumor activity of a second set of CART-MSLN (including M12, M14, M16, and M23) in the Ovcar8 xenograft model.
- FIG. 20A, 20B, and 20C depicts the loss of fucntionality of mesoCAR T cells in the tumor microenvironment (TILs) over time compared to fresh or thawed mesoCAR T cells.
- FIG. 21 depicts the effect of deletion of DGK on cytotoxicity of mesoCAR T cells. Percent target cell killing is assessed at different effector: target ratios.
- FIG. 22 depicts the effect of deletion of DGK on IFN ⁇ production and release from mesoCAR T cells. Concentration of IFN ⁇ is assessed at different effector: target ratios.
- FIG. 23 depicts the effect of deletion of DGK on ERK signaling, or T cell activation, mesoCAR T cells.
- B albumin
- M mesothelin
- 3/28 CD3/CD28 stimulated cells.
- FIG. 24 depicts the effect of deletion of DGK on TGF ⁇ sensitivity of mesoCAR T cells with regard to cytotoxic activity.
- FIG. 25A and 25B depict the effect of deletion of DGK on therapeutic efficacy of mesoCAR T cells in a tumor mouse model.
- FIG. 26A, 26B, 26C, 26D, 26E, and 26F shows the cytokine production and cytotoxic mediator release in CAR-expressing T cells with reduced levels of Ikaros.
- FIG. 26A shows Ikaros expression in wild-type and Ikzf1+/-CAR T cells as measured by flow cytometry (left panel) and western blot (right panel) .
- PMA/I mesothelin-coated beads
- BSA-coated beads control
- FIG. 27A, 27B, and 27C shows cytokine production and cytotoxic mediator release in CAR-expressing T cells with a dominant negative allele of Ikaros (IkDN) .
- IkDN Ikaros
- FIG. 28A, 28B, 28C, 28D, and 28E shows that the depletion of Ikaros did not augment activation and signaling of CAR T cells following antigen stimulation.
- the levels of CD69 (FIG. 28A) , CD25 (FIG. 28B) , and 4-1BB (FIG. 28C) was determined by flow cytometry at the indicated time points in Ikzf1+/-CAR T cells.
- FIG. 28D the RAS/ERK signaling pathways were examined in wild-type (WT) and Ikaros dominant negative cells (IkDN) after TCR stimulation with CD3/CD28 antibodies.
- the levels of phosphorylated TCR signaling proteins such as phosphorylated PLC ⁇ , phosphorylated Lck, phosphorylated JNK, phosphorylated Akt, phosphorylated ERK, phosphorylated IKK ⁇ , and I ⁇ B ⁇ were assessed by western blot.
- WT and IkDN cells transduced with mesoCAR were stimulated with BSA or mesothelin-coated beads, and downstream signaling pathways were examined by western blot by assessing the levels of phosphorylated ERK and phosphorylated PLC ⁇ .
- FIG. 29A, 29B, 29C, 29D, and 29E shows that the reduction of Ikaros in CAR T cells augments the response against target cells AE17 or mesothelin-expressing AE17 (AE17 meso) in vitro.
- FIG. 29A depicts IFN ⁇ production in WT and Ikzf1+/-meso CART cells at the indicated effector: target cell ratios. Cytolysis of meso CAR-expressing WT and Ikzf1+/- (FIG. 29B) and IkDN (FIG. 29C) was measured at the indicated effector: target cell ratios. IFN ⁇ production (FIG. 29D) and cytolysis (FIG. 29E) of WT and Ikzf1+/-transduced with FAP-CAR was measured at the indicated effector: target cell ratios, where the target cells were FAP-expressing 3T3 cells.
- FIG. 30A, 30B, and 30C shows the efficacy of CAR T cells with depletion of Ikaros against established tumors in vivo.
- CAR T cells were administered to mice bearing established mesothelin-expressing AE17 tumors. Tumor volume was measured after administration with mesoCAR-expressing WT and Ikzf1+/- (FIG. 30A) or IkDN (FIG. 30B) . Tumor volume was measured after administration of FAP-CAR-expressing WT and Ikzf1+/- (FIG. 30C) .
- FIG. 31A, 31B, 31C, 31D, 31E, and 31F shows the increased persistence and resistance of Ikzf1+/-CAR T cells in the immunosuppressive tumor microenvironment compared to WT CAR T cells.
- the percentage of CAR-expressing WT or Ikzf1+/-cells (GFP positive) were detected by flow cytometry from harvested from the spleen (FIG. 31A) and the tumors (FIG. 31B) .
- the functional capacity of the CAR T cells harvested 3 days after infusion from the spleen or tumors was assessed by measuring IFN ⁇ production after stimulation with CD3/CD28 antibodies (FIG. 31C) or PMA/Ionomycin (PMA/I) (FIG. 31D) .
- Regulatory T cells (CD4+FoxP3+ expression) and macrophages (CD206 expression) were assessed by measuring the expression of Treg or macrophage markers on CAR T cells harvested 9 days after infusion from the spleen or tumor
- FIG. 32A and 32B shows that T cells with reduced Ikaros levels are less sensitive to soluble inhibitory factors TGF ⁇ and adenosine.
- MesoCAR-expressing WT, Ikzf1+/-, and IkDN cells were tested for their ability to produce IFN ⁇ (FIG. 32A) and cytotoxicity (FIG. 32B) in response to TGF- ⁇ or adenosine.
- FIG. 33A and 33B are graphs showing an increase in titers to influenza vaccine strains as compared to placebo.
- the increase above baseline in influenza geometric mean titers to each of the 3 influenza vaccine strains H1N1 A/California/07/2009, H3N2 A/Victoria/210/2009, B/Brisbane/60/2008
- the bold black line indicates the 1.2 fold increase in titers relative to placebo that is required to be met for 2 out of 3 influenza vaccine strains to meet the primary endpoint of the study.
- FIG. 34 shows a scatter plot of RAD001 concentration versus fold increase in geometric mean titer to each influenza vaccine strain 4 weeks after vaccination.
- RAD001 concentrations (1 hour post dose) were measured after subjects had been dosed for 4 weeks. All subjects who had pharmacokinetic measurements were included in the analysis set.
- the fold increase in geometric mean titers at 4 weeks post vaccination relative to baseline is shown on the y axis.
- FIG. 35 is a graphic representation showing increase in titers to heterologous influenza strains as compared to placebo.
- the increase above baseline in influenza geometric mean titers to 2 heterologous influenza strains (A/H1N1 strain A/New Jersey/8/76 and A/H3N2 strain A/Victoria/361/11) not contained in the influenza vaccine relative to the increase in the placebo cohort 4 weeks after vaccination is shown for each of the RAD001 dosing cohorts in the intention to treat population.
- *indicates increase in titer relative to placebo exceeds 1 with a posterior probability of at least 80%.
- FIG. 36A and 36B are graphic representations of IgG and IgM levels before and after influenza vaccination. Levels of anti-A/H1N1/California/07/2009 influenza IgG and IgM were measured in serum obtained from subjects before and 4 weeks post influenza vaccination. No significant difference in the change from baseline to 4 weeks post vaccination in anti-H1N1 influenza IgG and IgM levels were detected between the RAD001 and placebo cohorts (all p values > 0.05 by Kruskal-Wallis rank sum test) .
- FIG. 37A, 37B, and 37C are graphic representations of the decrease in percent of PD-1-positive CD4 and CD8 and increase in PD-1-negative CD4 T cells after RAD001 treatment.
- the percent of PD-1-positive CD4, CD8 and PD-1-negative CD4 T cells was determined by FACS analysis of PBMC samples at baseline, after 6 weeks of study drug treatment (Week 6) and 6 weeks after study drug discontinuation and 4 weeks after influenza vaccination (Week 12) .
- FIG. 37A, 37B, and 37C are graphic representations of the decrease in percent of PD-1-positive CD4 and CD8 and increase in PD-1-negative CD4 T cells after RAD001 treatment.
- the percent of PD-1-positive CD4, CD8 and PD-1-negative CD4 T cells was determined by FACS analysis of PBMC samples at baseline, after 6 weeks of study drug treatment (Week 6) and 6 weeks after study drug discontinuation and 4 weeks after influenza vaccination (Week 12) .
- FIG. 38A and 38B are graphic representations of the decrease in percent of PD-1-positive CD4 and CD8 and increase in PD-1-negative CD4 T cells after RAD001 treatment adjusted for differences in baseline PD-1 expression.
- the percent of PD-1-positive CD4, CD8 and PD-1-negative CD4 T cells was determined by FACS analysis of PBMC samples at baseline, after 6 weeks of study drug treatment (Week 6) and 6 weeks after study drug discontinuation and 4 weeks after influenza vaccination (Week 12) .
- FIG. 38A and 38B represent the data in FIG. 37A, 37B, and 37C but with the different RAD001 dosage groups of FIG. 37A, 37B, and 37C pooled into the single RAD001-treated group in FIG. 38A and 38B.
- FIG. 39 depicts increases in exercise and energy in elderly subjects in response to RAD001.
- FIG. 40A and 40B depict the predicted effect of RAD001 on P70 S6K activity in cells.
- FIG. 40A depicts P70 S6 kinase inhibition with higher doses of weekly and daily RAD001;
- FIG. 40B depicts P70 S6 kinase inhibition with lower doses of weekly RAD001.
- FIG. 41A, 41B, and 41C are Biacore T200 SPR sensograms for the scFvs SS1 (FIG. 41A) , M5 (FIG. 41B) , and M11 (FIG. 41C) .
- FIG. 42A, 42B, and 42C are epitope binning SPR sensograms for the anti-human mesothelin scFvs in comparison to the murine SS1 scFv.
- Competitive binding was observed for scFvs M12, M14, M16, M17, M21, and M23 (FIG. 42A) .
- ScFv M5 (FIG. 42B) and M11 (FIG. 42C) bind to a different epitope than SS1.
- FIG. 43 is a graph depicting tumor growth after various mesothelin CAR T treatments in the OVCAR8 tumor model.
- T cells were administered on days 14 and 19.
- Small circles mice treated with 100ul of PBS via the lateral tail vein; black squares: mice treated with Isotype control T cells; gray triangles: mice treated with one dose of SS1 CAR T cells; inverted triangles: mice treated with a double dose of SS1 CAR T cells; diamonds: mice treated with a single dose of M5 CAR T cells; large circles: mice treated with a double dose of M5 CAR T cells; gray squares: mice treated with a single dose of M11 CAR T cells; and black triangles: mice treated with a double dose of M11 CAR T cells.
- FIG. 44 is a schematic representation of the human mesothelin peptide coverage in hydrogen deuterium exchange mass spectrometry analysis. Each black bar represents a peptide.
- FIG. 45A and 45B are graphic representations showing the difference in deuterium uptake of human mesothelin when in complex with SS1 (black bars) and M5 (grey bars) .
- the difference in deuterium uptake upon antibody binding (represented on the y-axis) is depicted for each peptide fragment detected (represented on the x-axis) , with peptides at amino acids 297-464 in FIG. 45A and peptides at amino acids 458-586 in FIG. 45B. All differences are relative to the deuterium uptake of unbound mesothelin (control) .
- FIG. 46 is a schematic representation showing the primary sequence of antigen human mesothelin (amino acids 296-588) and the regions protected by SS1 and M5.
- the black bars designate the amino acids protected when complexed with SS1 (amino acids 314-315, 317-318, 346-349, and 369-375) .
- the grey bars designate the amino acids protected when complexed with M5 (amino acids 485-490, 498-507, 532-537, and 545-572) .
- FIG. 47 shows a generic map showing different configurations of constructs encoding a CAR with a shRNA for coexpression of the CAR and an shRNA. Fig.
- FIG. 47A-47D show the various configurations on a single vector, e.g., where the U6 regulated shRNA is upstream or downstream of the EF1 alpha regulated CAR encoding elements.
- the transcription occurs through the U6 and EF1 alpha promoters in the same direction.
- the transcription occurs through the U6 and EF1 alpha promoters in different directions.
- the shRNA (and corresponding U6 promoter) is on a first vector
- the CAR (and corresponding EF1 alpha promoter) is on a second vector (Fig. 16E) .
- FIG. 48 depicts the structures of two exemplary RCAR configurations.
- the antigen binding members comprise an antigen binding domain, a transmembrane domain, and a switch domain.
- the intracellular binding members comprise a switch domain, a co-stimulatory signaling domain and a primary signaling domain.
- the two configurations demonstrate that the first and second switch domains described herein can be in different orientations with respect to the antigen binding member and the intracellular binding member.
- Other RCAR configurations are further described herein.
- an element means one element or more than one element.
- CAR Chimeric Antigen Receptor
- a CAR refers to a set of polypeptides, typically two in the simplest embodiments, which when in an immune effector cell, provides the cell with specificity for a target cell, typically a cancer cell, and with intracellular signal generation.
- a CAR comprises at least an extracellular antigen binding domain, a transmembrane domain and a cytoplasmic signaling domain (also referred to herein as “an intracellular signaling domain” ) comprising a functional signaling domain derived from a stimulatory molecule and/or costimulatory molecule as defined below.
- the set of polypeptides are contiguous with eachother.
- the set of polypeptides include a dimerization switch that, upon the presence of a dimerization molecule, can couple the polypeptides to one another, e.g., can couple an antigen binding domain to an intracellular signaling domain.
- the stimulatory molecule is the zeta chain associated with the T cell receptor complex.
- the cytoplasmic signaling domain further comprises one or more functional signaling domains derived from at least one costimulatory molecule as defined below.
- the costimulatory molecule is chosen from the costimulatory molecules described herein, e.g., 4-1BB (i.e., CD137) , CD27 and/or CD28.
- the CAR comprises a chimeric fusion protein comprising an extracellular antigen binding domain, a transmembrane domain and an intracellular signaling domain comprising a functional signaling domain derived from a stimulatory molecule. In one aspect, the CAR comprises a chimeric fusion protein comprising an extracellular antigen binding domain, a transmembrane domain and an intracellular signaling domain comprising a functional signaling domain derived from a costimulatory molecule and a functional signaling domain derived from a stimulatory molecule.
- the CAR comprises a chimeric fusion protein comprising an extracellular antigen binding domain, a transmembrane domain and an intracellular signaling domain comprising two functional signaling domains derived from one or more costimulatory molecule (s) and a functional signaling domain derived from a stimulatory molecule.
- the CAR comprises a chimeric fusion protein comprising an extracellular antigen binding domain, a transmembrane domain and an intracellular signaling domain comprising at least two functional signaling domains derived from one or more costimulatory molecule (s) and a functional signaling domain derived from a stimulatory molecule.
- the CAR comprises an optional leader sequence at the amino-terminus (N-ter) of the CAR fusion protein.
- the CAR further comprises a leader sequence at the N-terminus of the extracellular antigen binding domain, wherein the leader sequence is optionally cleaved from the antigen binding domain (e.g., a scFv) during cellular processing and localization of the CAR to the cellular membrane.
- the antigen binding domain e.g., a scFv
- signaling domain refers to the functional portion of a protein which acts by transmitting information within the cell to regulate cellular activity via defined signaling pathways by generating second messengers or functioning as effectors by responding to such messengers.
- mesothelin refers to the 40-kDa protein, mesothelin, which is anchored at the cell membrane by a glycosylphosphatidyl inositol (GPI) linkage and an amino- terminal 31-kDa shed fragment, called megkaryocyte potentiating factor (MPF) . Both fragments contain N-glycosylation sites.
- GPI glycosylphosphatidyl inositol
- MPF megkaryocyte potentiating factor
- Both fragments contain N-glycosylation sites.
- the term also refers to a soluble splice variant of the 40-kDa carboxyl-terminal fragment also called “soluble mesothelin/MPF-related” .
- the term refers to a human mesothelin of GenBank accession number AAH03512.1, and naturally cleaved portions thereof, e.g., as expressed on a cell membrane, e.g., a cancer cell membrane.
- antibody refers to a protein, or polypeptide sequence derived from an immunoglobulin molecule which specifically binds with an antigen.
- Antibodies can be polyclonal or monoclonal, multiple or single chain, or intact immunoglobulins, and may be derived from natural sources or from recombinant sources.
- Antibodies can be tetramers of immunoglobulin molecules.
- antibody fragment refers to at least one portion of an antibody, that retains the ability to specifically interact with (e.g., by binding, steric hinderance, stabilizing/destabilizing, spatial distribution) an epitope of an antigen.
- antibody fragments include, but are not limited to, Fab, Fab', F (ab') 2 , Fv fragments, scFv antibody fragments, disulfide-linked Fvs (sdFv) , a Fd fragment consisting of the VH and CH1 domains, linear antibodies, single domain antibodies such as sdAb (either VL or VH) , camelid VHH domains, multi-specific antibodies formed from antibody fragments such as a bivalent fragment comprising two Fab fragments linked by a disulfide brudge at the hinge region, and an isolated CDR or other epitope binding fragments of an antibody.
- An antigen binding fragment can also be incorporated into single domain antibodies, maxibodies, minibodies, nanobodies, intrabodies, diabodies, triabodies, tetrabodies, v-NAR and bis-scFv (see, e.g., Hollinger and Hudson, Nature Biotechnology 23: 1126-1136, 2005) .
- Antigen binding fragments can also be grafted into scaffolds based on polypeptides such as a fibronectin type III (Fn3) (see U.S. Patent No. : 6, 703, 199, which describes fibronectin polypeptide minibodies) .
- Fn3 fibronectin type III
- scFv refers to a fusion protein comprising at least one antibody fragment comprising a variable region of a light chain and at least one antibody fragment comprising a variable region of a heavy chain, wherein the light and heavy chain variable regions are contiguously linked, e.g., via a synthetic linker, e.g., a short flexible polypeptide linker, and capable of being expressed as a single chain polypeptide, and wherein the scFv retains the specificity of the intact antibody from which it is derived.
- a synthetic linker e.g., a short flexible polypeptide linker
- an scFv may have the VL and VH variable regions in either order, e.g., with respect to the N-terminal and C-terminal ends of the polypeptide, the scFv may comprise VL-linker-VH or may comprise VH-linker-VL.
- the portion of the CAR of the invention comprising an antibody or antibody fragment thereof may exist in a variety of forms where the antigen binding domain is expressed as part of a contiguous polypeptide chain including, for example, a single domain antibody fragment (sdAb) , a single chain antibody (scFv) a humanized antibody or bispecific antibody (Harlow et al., 1999, In: Using Antibodies: A Laboratory Manual, Cold Spring Harbor Laboratory Press, NY; Harlow et al., 1989, In: Antibodies: A Laboratory Manual, Cold Spring Harbor, New York; Houston et al., 1988, Proc. Natl. Acad. Sci. USA 85: 5879-5883; Bird et al., 1988, Science 242: 423-426) .
- the antigen binding domain of a CAR composition of the invention comprises an antibody fragment.
- the CAR comprises an antibody fragment that comprises a scFv.
- antibody heavy chain refers to the larger of the two types of polypeptide chains present in antibody molecules in their naturally occurring conformations, and which normally determines the class to which the antibody belongs.
- antibody light chain refers to the smaller of the two types of polypeptide chains present in antibody molecules in their naturally occurring conformations. Kappa ( ⁇ ) and lambda ( ⁇ ) light chains refer to the two major antibody light chain isotypes.
- recombinant antibody refers to an antibody which is generated using recombinant DNA technology, such as, for example, an antibody expressed by a bacteriophage or yeast expression system.
- the term should also be construed to mean an antibody which has been generated by the synthesis of a DNA molecule encoding the antibody and which DNA molecule expresses an antibody protein, or an amino acid sequence specifying the antibody, wherein the DNA or amino acid sequence has been obtained using recombinant DNA or amino acid sequence technology which is available and well known in the art.
- antigen refers to a molecule that provokes an immune response. This immune response may involve either antibody production, or the activation of specific immunologically-competent cells, or both.
- antigens can be derived from recombinant or genomic DNA. A skilled artisan will understand that any DNA, which comprises a nucleotide sequences or a partial nucleotide sequence encoding a protein that elicits an immune response therefore encodes an “antigen” as that term is used herein.
- an antigen need not be encoded solely by a full length nucleotide sequence of a gene. It is readily apparent that the present invention includes, but is not limited to, the use of partial nucleotide sequences of more than one gene and that these nucleotide sequences are arranged in various combinations to encode polypeptides that elicit the desired immune response. Moreover, a skilled artisan will understand that an antigen need not be encoded by a “gene” at all. It is readily apparent that an antigen can be generated synthesized or can be derived from a biological sample, or might be macromolecule besides a polypeptide. Such a biological sample can include, but is not limited to a tissue sample, a tumor sample, a cell or a fluid with other biological components.
- Compet refers to the ability of an antigen binding domain, e.g., an antibody or fragment thereof, to interfere with binding directly or indirectly of another antigen binding domain, e.g., an antigen binding domain provided herein, e.g., an antibody or fragment thereof provided herein, to the target, e.g., mesothelin.
- the extent to which an antigen binding domain, e.g., an antibody or fragment thereof, is able to interfere with the binding of another antigen binding domain, e.g., an antibody or fragment thereof, to the target, and therefore whether it can be said to compete can be determined using a competition binding assay.
- a competition binding assay is a quantitative competition assay.
- one particularly suitable quantitative competition assay uses a surface plasmon resonance (SPR) -based approach to measure binding, e.g., competition, between one antibody or fragment thereof and another antibody or fragment thereof for binding to an immobilized target.
- SPR surface plasmon resonance
- An exemplary SPR-based competition assay is described in Example 2 herein.
- Another suitable quantitative competition assay uses a FACS-based approach to measure competition between a labelled (e.g., His tagged, biotinylated or radioactively labeled, among others) antibody or fragment thereof and another antibody or fragment thereof for binding to the target.
- anti-cancer effect refers to a biological effect which can be manifested by various means, including but not limited to, e.g., a decrease in tumor volume, a decrease in the number of cancer cells, a decrease in the number of metastases, an increase in life expectancy, decrease in cancer cell proliferation, decrease in cancer cell survival, or amelioration of various physiological symptoms associated with the cancerous condition.
- An “anti-cancer effect” can also be manifested by the ability of the peptides, polynucleotides, cells and antibodies in prevention of the occurrence of cancer in the first place.
- anti-tumor effect refers to a biological effect which can be manifested by various means, including but not limited to, e.g., a decrease in tumor volume, a decrease in the number of tumor cells, a decrease in tumor cell proliferation, or a decrease in tumor cell survival.
- autologous refers to any material derived from the same individual to whom it is later to be re-introduced into the individual.
- allogeneic refers to any material derived from a different animal of the same species as the individual to whom the material is introduced. Two or more individuals are said to be allogeneic to one another when the genes at one or more loci are not identical. In some aspects, allogeneic material from individuals of the same species may be sufficiently unlike genetically to interact antigenically.
- xenogeneic refers to a graft derived from an animal of a different species.
- cancer refers to a disease characterized by the uncontrolled growth of aberrant cells. Cancer cells can spread locally or through the bloodstream and lymphatic system to other parts of the body. Examples of various cancers are described herein and include, but are not limited to, mesothelioma, breast cancer, prostate cancer, ovarian cancer, cervical cancer, skin cancer, pancreatic cancer, colorectal cancer, renal cancer, liver cancer, brain cancer, lymphoma, leukemia, lung cancer and the like.
- disease associated with expression of mesothelin includes, but is not limited to, a disease associated with expression of mesothelin or condition associated with cells which express mesothelin including, e.g., proliferative diseases such as a cancer or malignancy or a precancerous condition such as a mesothelial hyperplasia; or a noncancer related indication associated with cells which express mesothelin.
- proliferative diseases such as a cancer or malignancy or a precancerous condition such as a mesothelial hyperplasia
- a noncancer related indication associated with cells which express mesothelin include but are not limited to, mesothelioma, lung cancer, ovarian cancer, pancreatic cancer, and the like.
- conservative sequence modifications refers to amino acid modifications that do not significantly affect or alter the binding characteristics of the antibody or antibody fragment containing the amino acid sequence. Such conservative modifications include amino acid substitutions, additions and deletions. Modifications can be introduced into an antibody or antibody fragment of the invention by standard techniques known in the art, such as site-directed mutagenesis and PCR-mediated mutagenesis. Conservative amino acid substitutions are ones in which the amino acid residue is replaced with an amino acid residue having a similar side chain. Families of amino acid residues having similar side chains have been defined in the art.
- amino acids with basic side chains e.g., lysine, arginine, histidine
- acidic side chains e.g., aspartic acid, glutamic acid
- uncharged polar side chains e.g., glycine, asparagine, glutamine, serine, threonine, tyrosine, cysteine, tryptophan
- nonpolar side chains e.g., alanine, valine, leucine, isoleucine, proline, phenylalanine, methionine
- beta-branched side chains e.
- one or more amino acid residues within a CAR of the invention can be replaced with other amino acid residues from the same side chain family and the altered CAR can be tested, e.g., for the ability to bind mesothelin using the functional assays described herein.
- stimulation refers to a primary response induced by binding of a stimulatory molecule (e.g., a TCR/CD3 complex or CAR) with its cognate ligand (or tumor antigen in the case of a CAR) thereby mediating a signal transduction event, such as, but not limited to, signal transduction via the TCR/CD3 complex or signal transduction via the appropriate NK receptor or signaling domains of the CAR.
- a stimulatory molecule e.g., a TCR/CD3 complex or CAR
- its cognate ligand or tumor antigen in the case of a CAR
- Stimulation can mediate altered expression of certain molecules.
- the term “stimulatory molecule, ” refers to a molecule expressed by an immune cell (e.g., T cell, NK cell, B cell) that provides the cytoplasmic signaling sequence (s) that regulate activation of the immune cell in a stimulatory way for at least some aspect of the immune cell signaling pathway.
- the signal is a primary signal that is initiated by, for instance, binding of a TCR/CD3 complex with an MHC molecule loaded with peptide, and which leads to mediation of a T cell response, including, but not limited to, proliferation, activation, differentiation, and the like.
- a primary cytoplasmic signaling sequence (also referred to as a “primary signaling domain” ) that acts in a stimulatory manner may contain a signaling motif which is known as immunoreceptor tyrosine-based activation motif or ITAM.
- ITAM immunoreceptor tyrosine-based activation motif
- Examples of an ITAM containing cytoplasmic signaling sequence that is of particular use in the invention includes, but is not limited to, those derived from CD3 zeta, common FcR gamma (FCER1G) , Fc gamma RIIa, , FcR beta (Fc Epsilon R1b) , CD3 gamma, CD3 delta , CD3 epsilon, , CD79a, CD79b, DAP10, and DAP12.
- the intracellular signaling domain in any one or more CARS of the invention comprises an intracellular signaling sequence, e.g., a primary signaling sequence of CD3-zeta.
- the primary signaling sequence of CD3-zeta is the sequence provided as SEQ ID NO: 9, or the equivalent residues from a non-human species, e.g., mouse, rodent, monkey, ape and the like.
- the primary signaling sequence of CD3-zeta is the sequence as provided in SEQ ID NO: 10, or the equivalent residues from a non-human species, e.g., mouse, rodent, monkey, ape and the like.
- an immune system cell such as an accessory cell (e.g., a B-cell, a dendritic cell, and the like) that displays a foreign antigen complexed with major histocompatibility complexes (MHC's ) on its surface.
- MHC's major histocompatibility complexes
- T-cells may recognize these complexes using their T-cell receptors (TCRs) .
- APCs process antigens and present them to T-cells.
- intracellular signaling domain refers to an intracellular portion of a molecule.
- the intracellular signaling domain generates a signal that promotes an immune effector function of the CAR containing cell, e.g., a CART cell.
- immune effector function e.g., in a CART cell, include cytolytic activity and helper activity, including the secretion of cytokines.
- the intracellular signaling domain can comprise a primary intracellular signaling domain.
- Exemplary primary intracellular signaling domains include those derived from the molecules responsible for primary stimulation, or antigen dependent simulation.
- the intracellular signaling domain can comprise a costimulatory intracellular domain.
- Exemplary costimulatory intracellular signaling domains include those derived from molecules responsible for costimulatory signals, or antigen independent stimulation.
- a primary intracellular signaling domain can comprise a cytoplasmic sequence of a T cell receptor
- a costimulatory intracellular signaling domain can comprise cytoplasmic sequence from co-receptor or costimulatory molecule.
- a primary intracellular signaling domain can comprise a signaling motif which is known as an immunoreceptor tyrosine-based activation motif or ITAM.
- ITAM containing primary cytoplasmic signaling sequences include, but are not limited to, those derived from CD3 zeta, common FcR gamma (FCER1G) , Fc gamma RIIa, , FcR beta (Fc Epsilon R1b) , CD3 gamma, CD3 delta , CD3 epsilon, , CD79a, CD79b, DAP10, and DAP12.
- zeta or alternatively “zeta chain” , “CD3-zeta” or “TCR-zeta” is defined as the protein provided as GenBan Acc. No. BAG36664.1, or the equivalent residues from a non-human species, e.g., mouse, rodent, monkey, ape and the like, and a “zeta stimulatory domain” or alternatively a “CD3-zeta stimulatory domain” or a “TCR-zeta stimulatory domain” is defined as the amino acid residues from the cytoplasmic domain of the zeta chain, or functional derivatives thereof, that are sufficient to functionally transmit an initial signal necessary for T cell activation.
- the cytoplasmic domain of zeta comprises residues 52 through 164 of GenBank Acc. No. BAG36664.1 or the equivalent residues from a non-human species, e.g., mouse, rodent, monkey, ape and the like, that are functional orthologs thereof.
- the “zeta stimulatory domain” or a “CD3-zeta stimulatory domain” is the sequence provided as SEQ ID NO: 9.
- the “zeta stimulatory domain” or a “CD3-zeta stimulatory domain” is the sequence provided as SEQ ID NO: 10.
- costimulatory molecule refers to a cognate binding partner on a T cell that specifically binds with a costimulatory ligand, thereby mediating a costimulatory response by the T cell, such as, but not limited to, proliferation.
- Costimulatory molecules are cell surface molecules other than antigen receptors or their ligands that are contribute to an efficient immune response.
- Costimulatory molecules include, but are not limited to an MHC class I molecule, BTLA and a Toll ligand receptor, as well as OX40, CD27, CD28, CDS, ICAM-1, LFA-1 (CD11a/CD18) , ICOS (CD278) , and 4-1BB (CD137) .
- costimulatory molecules include CDS, ICAM-1, GITR, BAFFR, HVEM (LIGHTR) , SLAMF7, NKp80 (KLRF1) , NKp44, NKp30, NKp46, CD160, CD19, CD4, CD8alpha, CD8beta, IL2R beta, IL2R gamma, IL7R alpha, ITGA4, VLA1, CD49a, ITGA4, IA4, CD49D, ITGA6, VLA-6, CD49f, ITGAD, CD11d, ITGAE, CD103, ITGAL, CD11a, LFA-1, ITGAM, CD11b, ITGAX, CD11c, ITGB1, CD29, ITGB2, CD18, LFA-1, ITGB7, NKG2D, NKG2C, TNFR2, TRANCE/RANKL, DNAM1 (CD226) , SLAMF4 (CD244, 2B4) , CD84, CD96 (Tactile)
- a costimulatory intracellular signaling domain can be an intracellular portion of a costimulatory molecule.
- a costimulatory molecule can be represented in the following protein families: TNF receptor proteins, Immunoglobulin-like proteins, cytokine receptors, integrins, signaling lymphocytic activation molecules (SLAM proteins) , and activating NK cell receptors.
- Examples of such molecules include CD27, CD28, 4-1BB (CD137) , OX40, GITR, CD30, CD40, ICOS, BAFFR, HVEM, ICAM-1, lymphocyte function-associated antigen-1 (LFA-1) , CD2, CDS, CD7, CD287, LIGHT, NKG2C, SLAMF7, NKp80, CD160, B7-H3, and a ligand that specifically binds with CD83, and the like.
- LFA-1 lymphocyte function-associated antigen-1
- the intracellular signaling domain can comprise the entire intracellular portion, or the entire native intracellular signaling domain, of the molecule from which it is derived, or a functional fragment or derivative thereof.
- 4-1BB refers to a member of the TNFR superfamily with an amino acid sequence provided as GenBank Acc. No. AAA62478.2, or the equivalent residues from a non-human species, e.g., mouse, rodent, monkey, ape and the like.
- a “4-1BB costimulatory domain” is defined as amino acid residues 214-255 of GenBank Acc. No.. AAA62478.2, or the equivalent residues from a non-human species, e.g., mouse, rodent, monkey, ape and the like.
- the “4-1BB costimulatory domain” is the sequence provided as SEQ ID NO: 7 or the equivalent residues from a non-human species, e.g., mouse, rodent, monkey, ape and the like.
- an “antigen presenting cell, ” as used herein, means an immune system cell such as an accessory cell (e.g., a B-cell, a dendritic cell, and the like) that displays foreign antigens complexed with major histocompatibility complexes (MHC's ) on their surfaces.
- T-cells may recognize these complexes using their T-cell receptors (TCRs) .
- APCs process antigens and present them to T-cells.
- encoding refers to the inherent property of specific sequences of nucleotides in a polynucleotide, such as a gene, a cDNA, or an mRNA, to serve as templates for synthesis of other polymers and macromolecules in biological processes having either a defined sequence of nucleotides (i.e., rRNA, tRNA and mRNA) or a defined sequence of amino acids and the biological properties resulting therefrom.
- a gene, cDNA, or RNA encodes a protein if transcription and translation of mRNA corresponding to that gene produces the protein in a cell or other biological system.
- Both the coding strand the nucleotide sequence of which is identical to the mRNA sequence and is usually provided in sequence listings, and the non-coding strand, used as the template for transcription of a gene or cDNA, can be referred to as encoding the protein or other product of that gene or cDNA.
- nucleotide sequence encoding an amino acid sequence includes all nucleotide sequences that are degenerate versions of each other and that encode the same amino acid sequence.
- the phrase nucleotide sequence that encodes a protein or a RNA may also include introns to the extent that the nucleotide sequence encoding the protein may in some version contain an intron (s) .
- an effective amount or “therapeutically effective amount” is used interchangeably herein, and refer to an amount of a compound, formulation, material, or composition, as described herein effective to achieve a particular biological result.
- endogenous refers to any material from or produced inside an organism, cell, tissue or system.
- exogenous refers to any material introduced from or produced outside an organism, cell, tissue or system.
- expression refers to the transcription and/or translation of a particular nucleotide sequence driven by its promoter.
- transfer vector refers to a composition of matter which comprises an isolated nucleic acid and which can be used to deliver the isolated nucleic acid to the interior of a cell.
- Numerous vectors are known in the art including, but not limited to, linear polynucleotides, polynucleotides associated with ionic or amphiphilic compounds, plasmids, and viruses.
- the term “transfer vector” includes an autonomously replicating plasmid or a virus.
- the term should also be construed to further include non-plasmid and non-viral compounds which facilitate transfer of nucleic acid into cells, such as, for example, a polylysine compound, liposome, and the like.
- Examples of viral transfer vectors include, but are not limited to, adenoviral vectors, adeno-associated virus vectors, retroviral vectors, lentiviral vectors, and the like.
- expression vector refers to a vector comprising a recombinant polynucleotide comprising expression control sequences operatively linked to a nucleotide sequence to be expressed.
- An expression vector comprises sufficient cis-acting elements for expression; other elements for expression can be supplied by the host cell or in an in vitro expression system.
- Expression vectors include all those known in the art, including cosmids, plasmids (e.g., naked or contained in liposomes) and viruses (e.g., lentiviruses, retroviruses, adenoviruses, and adeno-associated viruses) that incorporate the recombinant polynucleotide.
- lentivirus refers to a genus of the Retroviridae family. Lentiviruses are unique among the retroviruses in being able to infect non-dividing cells; they can deliver a significant amount of genetic information into the DNA of the host cell, so they are one of the most efficient methods of a gene delivery vector. HIV, SIV, and FIV are all examples of lentiviruses.
- lentiviral vector refers to a vector derived from at least a portion of a lentivirus genome, including especially a self-inactivating lentiviral vector as provided in Milone et al., Mol. Ther. 17 (8) : 1453–1464 (2009) .
- lentivirus vectors that may be used in the clinic include but are not limited to, e.g., the gene delivery technology from Oxford BioMedica, the LENTIMAX TM vector system from Lentigen and the like. Nonclinical types of lentiviral vectors are also available and would be known to one skilled in the art.
- homologous refers to the subunit sequence identity between two polymeric molecules, e.g., between two nucleic acid molecules, such as, two DNA molecules or two RNA molecules, or between two polypeptide molecules.
- two nucleic acid molecules such as, two DNA molecules or two RNA molecules
- polypeptide molecules between two polypeptide molecules.
- a subunit position in both of the two molecules is occupied by the same monomeric subunit; e.g., if a position in each of two DNA molecules is occupied by adenine, then they are homologous or identical at that position.
- the homology between two sequences is a direct function of the number of matching or homologous positions; e.g., if half (e.g., five positions in a polymer ten subunits in length) of the positions in two sequences are homologous, the two sequences are 50%homologous; if 90%of the positions (e.g., 9 of 10) , are matched or homologous, the two sequences are 90%homologous.
- humanized refers to those forms of non-human (e.g., murine) antibodies are chimeric immunoglobulins, immunoglobulin chains or fragments thereof (such as Fv, Fab, Fab', F (ab') 2 or other antigen-binding subsequences of antibodies) which contain minimal sequence derived from non-human immunoglobulin.
- humanized antibodies and antibody fragments thereof are human immunoglobulins (recipient antibody or antibody fragment) in which residues from a complementary-determining region (CDR) of the recipient are replaced by residues from a CDR of a non-human species (donor antibody) such as mouse, rat or rabbit having the desired specificity, affinity, and capacity.
- CDR complementary-determining region
- Fv framework region (FR) residues of the human immunoglobulin are replaced by corresponding non-human residues.
- a humanized antibody/antibody fragment can comprise residues which are found neither in the recipient antibody nor in the imported CDR or framework sequences. These modifications can further refine and optimize antibody or antibody fragment performance.
- the humanized antibody or antibody fragment thereof will comprise a significant portion of at least one, and typically two, variable domains, in which all or substantially all of the CDR regions correspond to those of a non-human immunoglobulin and all or substantially all of the FR regions are those of a human immunoglobulin sequence.
- the humanized antibody or antibody fragment can also comprise at least a portion of an immunoglobulin constant region (Fc) , typically that of a human immunoglobulin.
- Fc immunoglobulin constant region
- the term “fully human” refers to an immunoglobulin, such as an antibody or antibody fragment, where the whole molecule is of human origin or consists of an amino acid sequence identical to a human form of the antibody or immunoglobulin.
- isolated means altered or removed from the natural state.
- a nucleic acid or a peptide naturally present in a living animal is not “isolated, ” but the same nucleic acid or peptide partially or completely separated from the coexisting materials of its natural state is “isolated. ”
- An isolated nucleic acid or protein can exist in substantially purified form, or can exist in a non-native environment such as, for example, a host cell.
- A refers to adenosine
- C refers to cytosine
- G refers to guanosine
- T refers to thymidine
- U refers to uridine.
- operably linked refers to functional linkage between a regulatory sequence and a heterologous nucleic acid sequence resulting in expression of the latter.
- a first nucleic acid sequence is operably linked with a second nucleic acid sequence when the first nucleic acid sequence is placed in a functional relationship with the second nucleic acid sequence.
- a promoter is operably linked to a coding sequence if the promoter affects the transcription or expression of the coding sequence.
- Operably linked DNA sequences can be contiguous with each other and, where necessary to join two protein coding regions, are in the same reading frame.
- parenteral administration of an immunogenic composition includes, e.g., subcutaneous (s.c.) , intravenous (i.v.) , intramuscular (i.m.) , or intrasternal injection, intratumoral, or infusion techniques.
- nucleic acid refers to deoxyribonucleic acids (DNA) or ribonucleic acids (RNA) and polymers thereof in either single-or double-stranded form. Unless specifically limited, the term encompasses nucleic acids containing known analogues of natural nucleotides that have similar binding properties as the reference nucleic acid and are metabolized in a manner similar to naturally occurring nucleotides. Unless otherwise indicated, a particular nucleic acid sequence also implicitly encompasses conservatively modified variants thereof (e.g., degenerate codon substitutions) , alleles, orthologs, SNPs, and complementary sequences as well as the sequence explicitly indicated.
- DNA deoxyribonucleic acids
- RNA ribonucleic acids
- degenerate codon substitutions may be achieved by generating sequences in which the third position of one or more selected (or all) codons is substituted with mixed-base and/or deoxyinosine residues (Batzer et al., Nucleic Acid Res. 19: 5081 (1991) ; Ohtsuka et al., J. Biol. Chem. 260: 2605-2608 (1985) ; and Rossolini et al., Mol. Cell. Probes 8: 91-98 (1994)) .
- polypeptide, ” and “protein” are used interchangeably, and refer to a compound comprised of amino acid residues covalently linked by peptide bonds.
- a protein or peptide must contain at least two amino acids, and no limitation is placed on the maximum number of amino acids that can comprise a protein’s or peptide’s sequence.
- Polypeptides include any peptide or protein comprising two or more amino acids joined to each other by peptide bonds.
- the term refers to both short chains, which also commonly are referred to in the art as peptides, oligopeptides and oligomers, for example, and to longer chains, which generally are referred to in the art as proteins, of which there are many types.
- Polypeptides include, for example, biologically active fragments, substantially homologous polypeptides, oligopeptides, homodimers, heterodimers, variants of polypeptides, modified polypeptides, derivatives, analogs, fusion proteins, among others.
- a polypeptide includes a natural peptide, a recombinant peptide, a recombinant peptide, or a combination thereof.
- promoter refers to a DNA sequence recognized by the synthetic machinery of the cell, or introduced synthetic machinery, required to initiate the specific transcription of a polynucleotide sequence.
- promoter/regulatory sequence refers to a nucleic acid sequence which is required for expression of a gene product operably linked to the promoter/regulatory sequence. In some instances, this sequence may be the core promoter sequence and in other instances, this sequence may also include an enhancer sequence and other regulatory elements which are required for expression of the gene product.
- the promoter/regulatory sequence may, for example, be one which expresses the gene product in a tissue specific manner.
- constitutive promoter refers to a nucleotide sequence which, when operably linked with a polynucleotide which encodes or specifies a gene product, causes the gene product to be produced in a cell under most or all physiological conditions of the cell.
- inducible promoter refers to a nucleotide sequence which, when operably linked with a polynucleotide which encodes or specifies a gene product, causes the gene product to be produced in a cell substantially only when an inducer which corresponds to the promoter is present in the cell.
- tissue-specific promoter refers to a nucleotide sequence which, when operably linked with a polynucleotide encodes or specified by a gene, causes the gene product to be produced in a cell substantially only if the cell is a cell of the tissue type corresponding to the promoter.
- flexible polypeptide linker refers to a peptide linker that consists of amino acids such as glycine and/or serine residues used alone or in combination, to link variable heavy and variable light chain regions together.
- the flexible polypeptide linkers include, but are not limited to, (Gly 4 Ser) 4 (SEQ ID NO: 27) or (Gly 4 Ser) 3 (SEQ ID NO: 28)
- the linkers include multiple repeats of (Gly 2 Ser) , (GlySer) or (Gly 3 Ser) (SEQ ID NO: 29) . Also included within the scope of the invention are linkers described in WO2012/138475, incorporated herein by reference) .
- a 5'cap (also termed an RNA cap, an RNA 7-methylguanosine cap or an RNA m 7 G cap) is a modified guanine nucleotide that has been added to the “front” or 5'end of a eukaryotic messenger RNA shortly after the start of transcription.
- the 5'cap consists of a terminal group which is linked to the first transcribed nucleotide. Its presence is critical for recognition by the ribosome and protection from RNases. Cap addition is coupled to transcription, and occurs co-transcriptionally, such that each influences the other.
- the 5'end of the mRNA being synthesized is bound by a cap-synthesizing complex associated with RNA polymerase.
- This enzymatic complex catalyzes the chemical reactions that are required for mRNA capping. Synthesis proceeds as a multi-step biochemical reaction.
- the capping moiety can be modified to modulate functionality of mRNA such as its stability or efficiency of translation.
- in vitro transcribed RNA refers to RNA, preferably mRNA, that has been synthesized in vitro.
- the in vitro transcribed RNA is generated from an in vitro transcription vector.
- the in vitro transcription vector comprises a template that is used to generate the in vitro transcribed RNA.
- a “poly (A) ” is a series of adenosines attached by polyadenylation to the mRNA.
- the polyA is between 50 and 5000 (SEQ ID NO: 30) , preferably greater than 64, more preferably greater than 100, most preferably greater than 300 or 400.
- poly (A) sequences can be modified chemically or enzymatically to modulate mRNA functionality such as localization, stability or efficiency of translation.
- polyadenylation refers to the covalent linkage of a polyadenylyl moiety, or its modified variant, to a messenger RNA molecule.
- mRNA messenger RNA
- the 3'poly (A) tail is a long sequence of adenine nucleotides (often several hundred) added to the pre-mRNA through the action of an enzyme, polyadenylate polymerase.
- the poly (A) tail is added onto transcripts that contain a specific sequence, the polyadenylation signal.
- Polyadenylation is also important for transcription termination, export of the mRNA from the nucleus, and translation. Polyadenylation occurs in the nucleus immediately after transcription of DNA into RNA, but additionally can also occur later in the cytoplasm.
- the mRNA chain is cleaved through the action of an endonuclease complex associated with RNA polymerase.
- the cleavage site is usually characterized by the presence of the base sequence AAUAAA near the cleavage site.
- adenosine residues are added to the free 3'end at the cleavage site.
- transient refers to expression of a non-integrated transgene for a period of hours, days or weeks, wherein the period of time of expression is less than the period of time for expression of the gene if integrated into the genome or contained within a stable plasmid replicon in the host cell.
- the terms “treat” , “treatment” and “treating” refer to the reduction or amelioration of the progression, severity and/or duration of a proliferative disorder, or the amelioration of one or more symptoms (preferably, one or more discernible symptoms) of a proliferative disorder resulting from the administration of one or more therapies (e.g., one or more therapeutic agents such as a CAR of the invention) .
- the terms “treat” , “treatment” and “treating” refer to the amelioration of at least one measurable physical parameter of a proliferative disorder, such as growth of a tumor, not necessarily discernible by the patient.
- the terms “treat” , “treatment” and “treating” -refer to the inhibition of the progression of a proliferative disorder, either physically by, e.g., stabilization of a discernible symptom, physiologically by, e.g., stabilization of a physical parameter, or both.
- the terms “treat” , “treatment” and “treating” refer to the reduction or stabilization of tumor size or cancerous cell count.
- signal transduction pathway refers to the biochemical relationship between a variety of signal transduction molecules that play a role in the transmission of a signal from one portion of a cell to another portion of a cell.
- cell surface receptor includes molecules and complexes of molecules capable of receiving a signal and transmitting signal across the membrane of a cell.
- subject is intended to include living organisms in which an immune response can be elicited (e.g., mammals, human) .
- substantially purified cell refers to a cell that is essentially free of other cell types.
- a substantially purified cell also refers to a cell which has been separated from other cell types with which it is normally associated in its naturally occurring state.
- a population of substantially purified cells refers to a homogenous population of cells. In other instances, this term refers simply to cell that have been separated from the cells with which they are naturally associated in their natural state.
- the cells are cultured in vitro. In other aspects, the cells are not cultured in vitro.
- terapéutica as used herein means a treatment.
- a therapeutic effect is obtained by reduction, suppression, remission, or eradication of a disease state.
- prophylaxis means the prevention of or protective treatment for a disease or disease state.
- cancer associated antigen or “tumor antigen” interchangeably refers to a molecule (typically a protein, carbohydrate or lipid) that is expressed on the surface of a cancer cell, either entirely or as a fragment (e.g., MHC/peptide) , and which is useful for the preferential targeting of a pharmacological agent to the cancer cell.
- a tumor antigen is a marker expressed by both normal cells and cancer cells, e.g., a lineage marker, e.g., CD19 on B cells.
- a tumor antigen is a cell surface molecule that is overexpressed in a cancer cell in comparison to a normal cell, for instance, 1-fold over expression, 2-fold overexpression, 3-fold overexpression or more in comparison to a normal cell.
- a tumor antigen is a cell surface molecule that is inappropriately synthesized in the cancer cell, for instance, a molecule that contains deletions, additions or mutations in comparison to the molecule expressed on a normal cell.
- a tumor antigen will be expressed exclusively on the cell surface of a cancer cell, entirely or as a fragment (e.g., MHC/peptide) , and not synthesized or expressed on the surface of a normal cell.
- the CARs of the present invention includes CARs comprising an antigen binding domain (e.g., antibody or antibody fragment) that binds to a MHC presented peptide.
- an antigen binding domain e.g., antibody or antibody fragment
- peptides derived from endogenous proteins fill the pockets of Major histocompatibility complex (MHC) class I molecules, and are recognized by T cell receptors (TCRs) on CD8 + T lymphocytes.
- TCRs T cell receptors
- the MHC class I complexes are constitutively expressed by all nucleated cells.
- virus-specific and/or tumor-specific peptide/MHC complexes represent a unique class of cell surface targets for immunotherapy.
- TCR-like antibodies targeting peptides derived from viral or tumor antigens in the context of human leukocyte antigen (HLA) -A1 or HLA-A2 have been described (see, e.g., Sastry et al., J Virol.
- TCR-like antibody can be identified from screening a library, such as a human scFv phage displayed library.
- transfected or “transformed” or “transduced” refers to a process by which exogenous nucleic acid is transferred or introduced into the host cell.
- a “transfected” or “transformed” or “transduced” cell is one which has been transfected, transformed or transduced with exogenous nucleic acid.
- the cell includes the primary subject cell and its progeny.
- the term “specifically binds, ” refers to an antibody, or a ligand, which recognizes and binds with a binding partner (e.g., tumor antigen) protein present in a sample, but which antibody or ligand does not substantially recognize or bind other molecules in the sample.
- a binding partner e.g., tumor antigen
- Regular chimeric antigen receptor refers to a set of polypeptides, typically two in the simplest embodiments, which when in a RCARX cell, provides the RCARX cell with specificity for a target cell, typically a cancer cell, and with regulatable intracellular signal generation or proliferation, which can optimize an immune effector property of the RCARX cell.
- An RCARX cell relies at least in part, on an antigen binding domain to provide specificity to a target cell that comprises the antigen bound by the antigen binding domain.
- an RCAR includes a dimerization switch that, upon the presence of a dimerization molecule, can couple an intracellular signaling domain to the antigen binding domain.
- Membrane anchor or “membrane tethering domain” , as that term is used herein, refers to a polypeptide or moiety, e.g., a myristoyl group, sufficient to anchor an extracellular or intracellular domain to the plasma membrane.
- Switch domain refers to an entity, typically a polypeptide-based entity, that, in the presence of a dimerization molecule, associates with another switch domain. The association results in a functional coupling of a first entity linked to, e.g., fused to, a first switch domain, and a second entity linked to, e.g., fused to, a second switch domain.
- a first and second switch domain are collectively referred to as a dimerization switch.
- the first and second switch domains are the same as one another, e.g., they are polypeptides having the same primary amino acid sequence, and are referred to collectively as a homodimerization switch. In embodiments, the first and second switch domains are different from one another, e.g., they are polypeptides having different primary amino acid sequences, and are referred to collectively as a heterodimerization switch. In embodiments, the switch is intracellular. In embodiments, the switch is extracellular. In embodiments, the switch domain is a polypeptide-based entity, e.g., FKBP or FRB-based, and the dimerization molecule is small molecule, e.g., a rapalogue.
- the switch domain is a polypeptide-based entity, e.g., an scFv that binds a myc peptide
- the dimerization molecule is a polypeptide, a fragment thereof, or a multimer of a polypeptide, e.g., a myc ligand or multimers of a myc ligand that bind to one or more myc scFvs.
- the switch domain is a polypeptide-based entity, e.g., myc receptor
- the dimerization molecule is an antibody or fragments thereof, e.g., myc antibody.
- the dimerization molecule does not naturally occur in the subject, or does not occur in concentrations that would result in significant dimerization.
- the dimerization molecule is a small molecule, e.g., rapamycin or a rapalogue, e.g, RAD001.
- bioequivalent refers to an amount of an agent other than the reference compound (e.g., RAD001) , required to produce an effect equivalent to the effect produced by the reference dose or reference amount of the reference compound (e.g., RAD001) .
- the effect is the level of mTOR inhibition, e.g., as measured by P70 S6 kinase inhibition, e.g., as evaluated in an in vivo or in vitro assay, e.g., as measured by an assay described herein, e.g., the Boulay assay, or measurement of phosphorylated S6 levels by western blot.
- the effect is alteration of the ratio of PD-1 positive/PD-1 negative T cells, as measured by cell sorting.
- a bioequivalent amount or dose of an mTOR inhibitor is the amount or dose that achieves the same level of P70 S6 kinase inhibition as does the reference dose or reference amount of a reference compound.
- a bioequivalent amount or dose of an mTOR inhibitor is the amount or dose that achieves the same level of alteration in the ratio of PD-1 positive/PD-1 negative T cells as does the reference dose or reference amount of a reference compound.
- low, immune enhancing, dose when used in conjuction with an mTOR inhibitor, e.g., an allosteric mTOR inhibitor, e.g., RAD001 or rapamycin, or a catalytic mTOR inhibitor, refers to a dose of mTOR inhibitor that partially, but not fully, inhibits mTOR activity, e.g., as measured by the inhibition of P70 S6 kinase activity. Methods for evaluating mTOR activity, e.g., by inhibition of P70 S6 kinase, are discussed herein. The dose is insufficient to result in complete immune suppression but is sufficient to enhance the immune response.
- an mTOR inhibitor e.g., an allosteric mTOR inhibitor, e.g., RAD001 or rapamycin, or a catalytic mTOR inhibitor
- the low, immune enhancing, dose of mTOR inhibitor results in a decrease in the number of PD-1 positive T cells and/or an increase in the number of PD-1 negative T cells, or an increase in the ratio of PD-1 negative T cells/PD-1 positive T cells. In an embodiment, the low, immune enhancing, dose of mTOR inhibitor results in an increase in the number of naive T cells. In an embodiment, the low, immune enhancing, dose of mTOR inhibitor results in one or more of the following:
- CD62L high CD127 high , CD27 + , and BCL2
- memory T cells e.g., memory T cell precursors
- KLRG1 a decrease in the expression of KLRG1, e.g., on memory T cells, e.g., memory T cell precursors;
- an increase in the number of memory T cell precursors e.g., cells with any one or combination of the following characteristics: increased CD62L high , increased CD127 high , increased CD27 + , decreased KLRG1, and increased BCL2; wherein any of the changes described above occurs, e.g., at least transiently, e.g., as compared to a non-treated subject.
- a range such as from 1 to 6 should be considered to have specifically disclosed subranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6 etc., as well as individual numbers within that range, for example, 1, 2, 2.7, 3, 4, 5, 5.3, and 6.
- a range such as 95-99%identity includes something with 95%, 96%, 97%, 98%, or 99%identity, and includes subranges such as 96-99%, 96-98%, 96-97%, 97-99%, 97-98%, and 98-99%identity. This applies regardless of the breadth of the range.
- compositions of matter and methods of use for the treatment of a disease such as cancer using anti-mesothelin chimeric antigen receptors (CAR) e.g., human mesothelin CAR.
- CAR anti-mesothelin chimeric antigen receptors
- the invention provides a number of chimeric antigen receptors comprising an antibody or antibody fragment engineered for specific binding to a mesothelin protein.
- the invention provides a cell (e.g., T cell or NK cell) engineered to express a CAR, e.g., wherein the CAR T cell ( “CART” ) exhibits an anticancer property.
- a cell is transformed with the CAR and the CAR is expressed on the cell surface.
- the cell e.g., T cell or NK cell
- the viral vector is a retroviral vector.
- the viral vector is a lentiviral vector.
- the cell may stably express the CAR.
- the cell e.g., T cell or NK cell
- a nucleic acid e.g., mRNA, cDNA, DNA, encoding a CAR.
- the cell may transiently express the CAR.
- the mesothelin protein binding portion of the CAR is a scFv antibody fragment.
- such antibody fragments are functional in that they retain the equivalent binding affinity, i.e., they bind the same antigen with comparable affinity, as the IgG antibody from which it is derived.
- such antibody fragments are functional in that they provide a biological response that can include, but is not limited to, activation of an immune response, inhibition of signal-transduction origination from its target antigen, inhibition of kinase activity, and the like, as will be understood by a skilled artisan.
- the mesothelin antigen binding domain of the CAR is a scFv antibody fragment that is human or humanized compared to the murine sequence of the scFv from which it is derived.
- the human anti-mesothelin scFv antibody fragment comprises a light chain variable region and/or a heavy chain variable region provided in Table 2, or a sequence with substantial identity thereto, e.g., 95-99%identity.
- the antibodies of the invention are incorporated into a chimeric antigen receptor (CAR) .
- the CAR comprises the polypeptide sequence provided herein as SEQ ID NO: 39; SEQ ID NO: 40, SEQ ID NO: 41, SEQ ID NO: 42, SEQ ID NO: 43, SEQ ID NO: 44, SEQ ID NO: 45, SEQ ID NO: 46, SEQ ID NO: 47, SEQ ID NO: 48, SEQ ID NO:49, SEQ ID NO: 50, SEQ ID NO: 51, SEQ ID NO: 52, SEQ ID NO: 53, SEQ ID NO: 54, SEQ ID NO: 55, SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO:60, SEQ ID NO: 61, and SEQ ID NO: 62, or a sequence with 95-99%identify thereof.
- the human scFv portion of a CAR is encoded by a transgene whose sequence has been codon optimized for expression in a mammalian cell.
- entire CAR construct of the invention is encoded by a transgene whose entire sequence has been codon optimized for expression in a mammalian cell.
- Codon optimization refers to the discovery that the frequency of occurrence of synonymous codons (i.e., codons that code for the same amino acid) in coding DNA is biased in different species. Such codon degeneracy allows an identical polypeptide to be encoded by a variety of nucleotide sequences.
- a variety of codon optimization methods is known in the art, and include, e.g., methods disclosed in at least US Patent Numbers 5,786, 464 and 6, 114, 148.
- the human mesothelin CAR molecule comprises the scFv portion provided in SEQ ID NO: 39. In one aspect, the human mesothelin CAR molecule comprises the scFv portion provided in SEQ ID NO: 40. In one aspect, the human mesothelin CAR molecule comprises the scFv portion provided in SEQ ID NO: 41. In one aspect, the human mesothelin CAR molecule comprises the scFv portion provided in SEQ ID NO: 42. In one aspect, the human mesothelin CAR molecule comprises the scFv portion provided in SEQ ID NO: 43.
- the human mesothelin CAR molecule comprises the scFv portion provided in SEQ ID NO: 44. In one aspect, the human mesothelin CAR molecule comprises the scFv portion provided in SEQ ID NO: 45. In one aspect, the human mesothelin CAR molecule comprises the scFv portion provided in SEQ ID NO: 46. In one aspect, the human mesothelin CAR molecule comprises the scFv portion provided in SEQ ID NO: 47. In one aspect, the human mesothelin CAR molecule comprises the scFv portion provided in SEQ ID NO: 48.
- the human mesothelin CAR molecule comprises the scFv portion provided in SEQ ID NO: 49. In one aspect, the human mesothelin CAR molecule comprises the scFv portion provided in SEQ ID NO: 50. In one aspect, the human mesothelin CAR molecule comprises the scFv portion provided in SEQ ID NO: 51. In one aspect, the human mesothelin CAR molecule comprises the scFv portion provided in SEQ ID NO: 52. In one aspect, the human mesothelin CAR molecule comprises the scFv portion provided in SEQ ID NO: 53.
- the human mesothelin CAR molecule comprises the scFv portion provided in SEQ ID NO: 54. In one aspect, the human mesothelin CAR molecule comprises the scFv portion provided in SEQ ID NO: 55. In one aspect, the human mesothelin CAR molecule comprises the scFv portion provided in SEQ ID NO: 56. In one aspect, the human mesothelin CAR molecule comprises the scFv portion provided in SEQ ID NO: 57. In one aspect, the human mesothelin CAR molecule comprises the scFv portion provided in SEQ ID NO: 58.
- the human mesothelin CAR molecule comprises the scFv portion provided in SEQ ID NO: 59. In one aspect, the human mesothelin CAR molecule comprises the scFv portion provided in SEQ ID NO: 60. In one aspect, the human mesothelin CAR molecule comprises the scFv portion provided in SEQ ID NO: 61. In one aspect, the human mesothelin CAR molecule comprises the scFv portion provided in SEQ ID NO: 62.
- the CAR disclosed herein combine an antigen binding domain of a specific antibody with an intracellular signaling molecule.
- the intracellular signaling molecule includes, but is not limited to, CD3-zeta chain, 4-1BB and CD28 signaling modules and combinations thereof.
- the antigen binding domain binds to mesothelin.
- the -mesothelin CAR comprises the sequence provided in Table 2.
- the mesothelin CAR comprises a CAR selected from the sequence provided in one or more of SEQ ID NOS: 63-86.
- themesothelin CAR comprises the sequence provided in SEQ ID NO: 63.
- themesothelin CAR comprises the sequence provided in SEQ ID NO: 64.
- themesothelin CAR comprises the sequence provided in SEQ ID NO: 65.
- themesothelin CAR comprises the sequence provided in SEQ ID NO: 66.
- themesothelin CAR comprises the sequence provided in SEQ ID NO: 67.
- themesothelin CAR comprises the sequence provided in SEQ ID NO: 68.
- themesothelin CAR comprises the sequence provided in SEQ ID NO: 69. In one aspect, themesothelin CAR comprises the sequence provided in SEQ ID NO: 70. In one aspect, themesothelin CAR comprises the sequence provided in SEQ ID NO: 71. In one aspect, themesothelin CAR comprises the sequence provided in SEQ ID NO: 72. In one aspect, themesothelin CAR comprises the sequence provided in SEQ ID NO: 73. In one aspect, themesothelin CAR comprises the sequence provided in SEQ ID NO: 74. In one aspect, themesothelin CAR comprises the sequence provided in SEQ ID NO: 75. In one aspect, themesothelin CAR comprises the sequence provided in SEQ ID NO: 76.
- themesothelin CAR comprises the sequence provided in SEQ ID NO: 77. In one aspect, themesothelin CAR comprises the sequence provided in SEQ ID NO: 78. In one aspect, themesothelin CAR comprises the sequence provided in SEQ ID NO: 79. In one aspect, themesothelin CAR comprises the sequence provided in SEQ ID NO: 80. In one aspect, themesothelin CAR comprises the sequence provided in SEQ ID NO: 81. In one aspect, themesothelin CAR comprises the sequence provided in SEQ ID NO: 82. In one aspect, themesothelin CAR comprises the sequence provided in SEQ ID NO: 83. In one aspect, themesothelin CAR comprises the sequence provided in SEQ ID NO: 84. In one aspect, themesothelin CAR comprises the sequence provided in SEQ ID NO: 85. In one aspect, themesothelin CAR comprises the sequence provided in SEQ ID NO: 86.
- the present invention provides mesothelin CAR compositions and their use in medicaments or methods for treating, among other diseases, cancer or any malignancy or autoimmune diseases involving cells or tissues which express mesothelin.
- the invention provides a cell (e.g., T cell or NK cell) engineered to express a chimeric antigen receptor (CAR) , wherein the CAR T cell ( “CART” ) exhibits an antitumor property.
- a preferred antigen is mesothelin.
- the antigen binding domain of the CAR comprises a human anti-mesothelin antibody fragment.
- the antigen binding domain of the CAR comprises a human anti-mesothelin antibody fragment comprising an scFv. Accordingly, the invention provides an mesothelin CAR that comprises a human anti-mesothelin binding domain and is engineered into a T cell or NK cell and methods of their use for adoptive therapy.
- mesothelin CAR comprises at least one intracellular signaling domain selected from the group consisting of a CD137 (4-1BB) signaling domain, a CD28 signaling domain, a CD3zeta signal domain, and any combination thereof.
- the mesothelin CAR comprises at least one intracellular signaling domain of one or more costimulatory molecule (s) other than a CD137 (4-1BB) or CD28, a CD3zeta signal domain, and any combination thereof.
- the present invention provides mesothelin CAR compositions and their use in medicaments or methods for treating, among other diseases, cancer or any malignancy or autoimmune diseases involving cells or tissues which express mesothelin.
- the present invention encompasses a recombinant nucleic acid construct comprising sequences encoding a CAR, wherein the CAR comprises an antibody that binds specifically to mesothelin, e.g., a human antibody fragment that specifically binds to mesothelin.
- the mesothelin is human mesothelin
- the sequence of the antibody fragment is contiguous with, and in the same reading frame as a nucleic acid sequence encoding an intracellular signaling domain.
- the intracellular signaling domain can comprise a costimulatory signaling domain and/or a primary signaling domain, e.g., a zeta chain.
- the costimulatory signaling domain refers to a portion of the CAR comprising at least a portion of the intracellular domain of a costimulatory molecule.
- a CAR construct of the invention comprises a scFv domain selected from the group consisting of SEQ ID NOS: 39-62, wherein the scFv may be preceded by an optional leader sequence such as provided in SEQ ID NO: 1, and followed by an optional hinge sequence such as provided in SEQ ID NO: 2 or SEQ ID NO: 3 or SEQ ID NO: 4 or SEQ ID NO:5, a transmembrane region such as provided in SEQ ID NO: 6, an intracellular signalling domain that includes SEQ ID NO: 7 or SEQ ID NO: 8 and a CD3 zeta sequence that includes SEQ ID NO: 9 or SEQ ID NO: 10, wherein the domains are contiguous with and in the same reading frame to form a single fusion protein.
- nucleotide sequence that encodes the polypeptide selected from the group consisting of SEQ ID NO: 87; SEQ ID NO: 88, SEQ ID NO: 89, SEQ ID NO: 90, SEQ ID NO: 91, SEQ ID NO: 92, SEQ ID NO:93, SEQ ID NO: 94, SEQ ID NO: 95, SEQ ID NO: 96, SEQ ID NO: 97, SEQ ID NO: 98, SEQ ID NO: 99, SEQ ID NO: 100, SEQ ID NO: 101, SEQ ID NO: 102, SEQ ID NO: 103, SEQ ID NO: 104, SEQ ID NO: 105, SEQ ID NO: 106, SEQ ID NO: 107, SEQ ID NO: 108, SEQ ID NO:109, and SEQ ID NO: 110, or a sequence with 95-99%identify thereof.
- nucleotide sequence that encodes the polypeptide of each of the scFv fragments selected from the group consisting of SEQ ID NO: 39; SEQ ID NO: 40, SEQ ID NO: 41, SEQ ID NO: 42, SEQ ID NO: 43, SEQ ID NO: 44, SEQ ID NO: 45, SEQ ID NO: 46, SEQ ID NO: 47, SEQ ID NO: 48, SEQ ID NO: 49, SEQ ID NO: 50, SEQ ID NO: 51, SEQ ID NO: 52, SEQ ID NO:53, SEQ ID NO: 54, SEQ ID NO: 55, SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, and SEQ ID NO: 62, or a sequence with 95-99%identify thereof, and each of the domains of SEQ ID NOS: 1, 2, and 6-9, plus the encoded mesothelin C
- an exemplary mesothelin CAR constructs comprisean optional leader sequence, an extracellular mesothelin binding domain, a hinge, a transmembrane domain, and an intracellular stimulatory domain.
- the mesothelin CAR construct comprises an optional leader sequence, a mesothelin binding domain, a hinge, a transmembrane domain, an intracellular costimulatory domain and an intracellular stimulatory domain.
- Specific mesothelin CAR constructs containing human scFv domains are provided as SEQ ID NOs: 87-110.
- SEQ ID NO: 63 Full-length CAR sequences are also provided herein as SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, SEQ ID NO: 69, SEQ ID NO: 70, SEQ ID NO: 71, SEQ ID NO: 72, SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, SEQ ID NO: 79, SEQ ID NO: 80, SEQ ID NO:81, SEQ ID NO: 82, SEQ ID NO: 83, SEQ ID NO: 84, SEQ ID NO: 85, or SEQ ID NO: 86.
- An exemplary leader sequence is provided as SEQ ID NO: 1.
- An exemplary hinge/spacer sequence is provided as SEQ ID NO: 2 or SEQ ID NO: 3 or SEQ ID NO: 4 or SEQ ID NO: 5.
- An exemplary transmembrane domain sequence is provided as SEQ ID NO: 6.
- An exemplary sequence of the intracellular signaling domain of the 4-1BB protein is provided as SEQ ID NO: 7.
- An exemplary sequence of the intracellular signaling domain of CD27 is provided as SEQ ID NO:8.
- An exemplary CD3zeta domain sequence is provided as SEQ ID NO: 9 or SEQ ID NO:10.
- the present invention encompasses a recombinant nucleic acid construct comprising a nucleic acid molecule encoding a CAR, wherein the nucleic acid molecule comprises the nucleic acid sequence encoding an anti-mesothelin binding domain, e.g., described herein, that is contiguous with and in the same reading frame as a nucleic acid sequence encoding an intracellular signaling domain.
- the anti-mesothlin binding domain is selected from one or more of SEQ ID NOS: 87-110.
- the anti-mesothelin binding domain comprises SEQ ID NO: 87.
- the anti-mesothelin binding domain comprises SEQ ID NO: 88.
- the anti-mesothelin binding domain comprises SEQ ID NO: 89. In one aspect, the anti-mesothelin binding domain comprises SEQ ID NO: 90. In one aspect, the anti-mesothelin binding domain comprises SEQ ID NO: 91. In one aspect, the anti-mesothelin binding domain comprises SEQ ID NO: 92. In one aspect, the anti-mesothelin binding domain comprises SEQ ID NO: 93. In one aspect, the anti-mesothelin binding domain comprises SEQ ID NO: 94. In one aspect, the anti-mesothelin binding domain comprises SEQ ID NO: 95. In one aspect, the anti-mesothelin binding domain comprises SEQ ID NO: 96.
- the anti-mesothelin binding domain comprises SEQ ID NO: 97. In one aspect, the anti-mesothelin binding domain comprises SEQ ID NO: 98. In one aspect, the anti-mesothelin binding domain comprises SEQ ID NO: 99. In one aspect, the anti-mesothelin binding domain comprises SEQ ID NO: 100. In one aspect, the anti-mesothelin binding domain comprises SEQ ID NO: 101. In one aspect, the anti-mesothelin binding domain comprises SEQ ID NO: 102. In one aspect, the anti-mesothelin binding domain comprises SEQ ID NO: 103. In one aspect, the anti-mesothelin binding domain comprises SEQ ID NO: 104.
- the anti-mesothelin binding domain comprises SEQ ID NO: 105. In one aspect, the anti-mesothelin binding domain comprises SEQ ID NO: 106. In one aspect, the anti-mesothelin binding domain comprises SEQ ID NO: 107. In one aspect, the anti-mesothelin binding domain comprises SEQ ID NO: 108. In one aspect, the anti-mesothelin binding domain comprises SEQ ID NO: 109. In one aspect, the anti-mesothelin binding domain comprises SEQ ID NO: 110.
- the present invention encompasses a recombinant DNA construct comprising a transgene encoding a CAR, wherein the transgene comprises the nucleic acid sequence encoding an anti-mesothelin binding domain described herein, e.g., a human anti-mesothelin binding domain selected from one or more of SEQ ID NOS: 87-110, wherein the sequence is contiguous with and in the same reading frame as the nucleic acid sequence encoding an intracellular signaling domain.
- An exemplary intracellular signaling domain that can be used in the CAR includes, but is not limited to, one or more intracellular signaling domains of, e.g., CD3-zeta, CD28, 4-1BB, and the like.
- the CAR can comprise any combination of CD3-zeta, CD28, 4-1BB, and the like.
- the nucleic acid sequence of a CAR construct of the invention is selected from one or more of SEQ ID NOS: 111-134.
- the nucleic acid sequence of a CAR construct is SEQ ID NO: 111.
- the nucleic acid sequence of a CAR construct is SEQ ID NO: 112.
- the nucleic acid sequence of a CAR construct is SEQ ID NO: 113.
- the nucleic acid sequence of a CAR construct is SEQ ID NO: 114.
- the nucleic acid sequence of a CAR construct is SEQ ID NO: 115.
- nucleic acid sequence of a CAR construct is SEQ ID NO: 116. In one aspect the nucleic acid sequence of a CAR construct is SEQ ID NO: 117. In one aspect the nucleic acid sequence of a CAR construct is SEQ ID NO: 118. In one aspect the nucleic acid sequence of a CAR construct is SEQ ID NO: 119. In one aspect the nucleic acid sequence of a CAR construct is SEQ ID NO: 120. In one aspect the nucleic acid sequence of a CAR construct is SEQ ID NO: 121. In one aspect the nucleic acid sequence of a CAR construct is SEQ ID NO: 122. In one aspect the nucleic acid sequence of a CAR construct is SEQ ID NO: 123.
- nucleic acid sequence of a CAR construct is SEQ ID NO: 124. In one aspect the nucleic acid sequence of a CAR construct is SEQ ID NO: 125. In one aspect the nucleic acid sequence of a CAR construct is SEQ ID NO: 126. In one aspect the nucleic acid sequence of a CAR construct is SEQ ID NO: 127. In one aspect the nucleic acid sequence of a CAR construct is SEQ ID NO: 128. In one aspect the nucleic acid sequence of a CAR construct is SEQ ID NO: 129. In one aspect the nucleic acid sequence of a CAR construct is SEQ ID NO: 130. In one aspect the nucleic acid sequence of a CAR construct is SEQ ID NO: 131.
- nucleic acid sequence of a CAR construct is SEQ ID NO: 132. In one aspect the nucleic acid sequence of a CAR construct is SEQ ID NO: 133. In one aspect the nucleic acid sequence of a CAR construct is SEQ ID NO: 134.
- nucleic acid sequences coding for the desired molecules can be obtained using recombinant methods known in the art, such as, for example by screening libraries from cells expressing the gene, by deriving the gene from a vector known to include the same, or by isolating directly from cells and tissues containing the same, using standard techniques.
- the nucleic acid of interest can be produced synthetically, rather than cloned.
- the present invention includes retroviral and lentiviral vector constructs expressing a CAR that can be directly transduced into a cell.
- the present invention also includes an RNA construct that can be directly transfected into a cell.
- a method for generating mRNA for use in transfection involves in vitro transcription (IVT) of a template with specially designed primers, followed by polyA addition, to produce a construct containing 3’and 5’untranslated sequence ( “UTR” ) , a 5’cap and/or Internal Ribosome Entry Site (IRES) , the nucleic acid to be expressed, and a polyA tail, typically 50-2000 bases in length (SEQ ID NO: 35) .
- RNA so produced can efficiently transfect different kinds of cells.
- the template includes sequences for the CAR.
- an RNA CAR vector is transduced into a T cell by electroporation.
- the CAR of the invention comprises a target-specific binding element otherwise referred to as an antigen binding domain.
- the choice of antigen binding domain depends upon the type and number of antigens that define the surface of a target cell.
- the antigen binding domain may be chosen to recognize a antigen that acts as a cell surface marker on target cells associated with a particular disease state.
- the CAR-mediated immune effector cell response can be directed to cells that express an antigen of interest, where the CAR comprises an antigen binding domain that specifically binds to the antigen of interest.
- the portion of the CAR comprising the antigen binding domain comprises an antigen binding domain that targets mesothelin.
- the antigen binding domain targets human mesothelin.
- the antigen binding domain can be any domain that binds to the antigen including but not limited to a monoclonal antibody, a polyclonal antibody, a recombinant antibody, a human antibody, a humanized antibody, and a functional fragment thereof, including but not limited to a single-domain antibody such as a heavy chain variable domain (VH) , a light chain variable domain (VL) and a variable domain (VHH) of camelid derived nanobody, and to an alternative scaffold known in the art to function as an antigen binding domain, such as a recombinant fibronectin domain, and the like.
- VH heavy chain variable domain
- VL light chain variable domain
- VHH variable domain
- the antigen binding domain of the CAR may comprise human or humanized residues for the antigen binding domain of an antibody or antibody fragment.
- the antigen binding domain comprises a human antibody or an antibody fragment.
- the anti-mesothelin binding domain does not compete, or competes poorly, for binding to human mesothelin with an antigen binding domain comprising an amino acid sequence comprising SEQ ID NO: 279, e.g., murine SS1 scFv, e.g., in a competition assay described herein.
- amino acid sequence of murine SS1 scFv is provided below (SEQ ID NO: 279) :
- the anti-mesothelin binding domain competes for binding to human mesothelin with an antigen binding domain comprising a LC CDR1, LC CDR2 and LC CDR3 of an anti-mesothelin light chain amino acid sequence selected from SEQ ID NO: 43 or SEQ ID NO: 49 and an HC CDR1, HC CDR2, and HC CDR3 of an anti-mesothelin heavy chain amino acid sequence selected from SEQ ID NO: 43 or SEQ ID NO: 49, e.g., in a competition assay described herein.
- the anti-mesothelin binding domain competes for binding to human mesothelin with an antigen binding domain comprising a LC CDR1 selected from SEQ ID NO: 203 or SEQ ID NO: 209, a LC CDR2 selected from SEQ ID NO: 227 or SEQ ID NO: 233, and a LC CDR3 selected from SEQ ID NO: 251 or SEQ ID NO: 257; and a HC CDR1 selected from SEQ ID NO: 138 or SEQ ID NO: 144, a HC CDR2 selected from SEQ ID NO:156 or SEQ ID NO: 162, and a HC CDR3 selected from SEQ ID NO: 179 or SEQ ID NO: 185, e.g., in a competition assay described herein.
- an antigen binding domain comprising a LC CDR1 selected from SEQ ID NO: 203 or SEQ ID NO: 209, a LC CDR2 selected from SEQ ID NO: 227 or SEQ ID NO:
- the anti-mesothelin binding domain competes for binding to human mesothelin with an antigen binding domain comprising a sequence selected from SEQ ID NO:43 or SEQ ID NO: 49, e.g., in a competition assay described herein.
- the competition assay is an SPR-based assay.
- the antigen e.g., human mesothelin
- the antigen layer is immobilized on a surface.
- a reference antibody is injected over the antigen layer.
- an increase in signal typically expressed in response units (RU) is detected, e.g., reference signal.
- RU response units
- an additional increase in signal is detected, e.g., a 5%or more, 10%or more, 15%or more, 20%or more, 25%or more, 30%or more, 35%, or more, 40%or more, 45%or more, 50%or more, 55%of more, 60%or more, 65%or more, 70%or more, 75%or more, 80%or more, 85%or more, 90%or more, or 95%or more increase in signal, e.g., RU, as compared to the highest signal detected upon binding of the reference antibody, e.g., the reference signal.
- test antibody binds to the same region or epitope of the antigen, then little or no increase in signal, e.g., RU, will be detected, e.g., less than 20%, less than 15%, less than 10%, less than 5%, less than 4%, less than 3%, less than 2 %, or less than 1%increase in signal, e.g., RU, as compared to the highest signal detected upon binding of the reference antibody, e.g., the reference signal.
- an antibody is said to compete with the reference antibody when less than 20%, less than 15%, less than 10%, less than 5%, less than 4%, less than 3%, less than 2 %, or less than 1%increase in signal, e.g., RU, is detected when compared to the reference signal detected upon binding of the reference antibody to the antigen.
- An antibody is said to not compete, or compete poorly, with a reference antibody when a 5%or more, 10%or more, 15%or more, 20%or more, 25%or more, 30%or more, 35%, or more, 40%or more, 45%or more, 50%or more, 55%of more, 60%or more, 65%or more, 70%or more, 75%or more, 80%or more, 85%or more, 90%or more, or 95%or more increase in signal, e.g., RU, is detected when compared to the reference signal detected upon binding of the reference antibody to the antigen.
- Identification of the epitope bound by the antigen binding domains described herein can be determined by various methods known in the art. For example, crystal structures can be generated containing the antigen binding domain bound to, or in complex with, the antigen. In another example, assays, e.g., a protection assay, can be performed to identify the regions of the antigen contribute to the epitope, or to identify the epitope.
- a protection assay e.g., a hydrogen/deuterium exchange (HDX) mass spectrometry assay, is described further in Example 18.
- HDX hydrogen/deuterium exchange
- the HDX mass spectrometry was performed to identify the putative epitopes on human MSLN, e.g., hMSLN 296-588 , e.g., SEQ ID NO: 278, for murine SS1, e.g., SEQ ID NO: 279, and the M5 scFv described herein, e.g., SEQ ID NO: 43.
- hMSLN 296-588 e.g., SEQ ID NO: 278, represents amino acids 296-588 of human mesothelin, e.g., the first amino acid of SEQ ID NO: 278 is amino acid 296 and the last amino acid of SEQ ID NO: 278 is amino acid 588.
- the amino acid sequence for human mesothelin, amino acids 296-588 is provided below: (SEQ ID NO: 278)
- results of the HDX mass spectrometry assay indicated that one or more amino acids of 314-315, 317-318, 346-349, and 369-375 of hMSLN 296-588 , e.g., SEQ ID NO: 278 contribute to the epitope recognized by SS1.
- results of the HDX mass spectrometry assay indicated that one or more amino acids of 485-490, 498-507, 532-537, or 545-572 of hMSLN 296- 588 , e.g., SEQ ID NO: 278, contribute to the epitope recognized by an anti-mesothelin antigen binding domain described herein, e.g., M5 scFv, e.g., SEQ ID NO: 43.
- the anti-mesothelin binding domain described herein binds to a different epitope of human mesothelin, e.g., SEQ ID NO: 278, than the epitope of human mesothelin targeted by the antigen binding domain comprising a sequence comprising SEQ ID NO:279, e.g., murine SS1.
- the epitope recognized by SS1 comprises a sequence selected from amino acids 314-315, 317-318, 346-349, or 369-375 of hMSLN 296-588 , e.g., SEQ ID NO: 278, or any combination thereof.
- the epitope recognized by SS1 comprises one or more amino acids selected from amino acids 314-315, 317-318, 346-349, or 369-375 of hMSLN 296-588 , e.g., SEQ ID NO: 278.
- the anti-mesothelin binding domain described herein binds to the C-terminus of human mesothelin. In one embodiment, the anti-mesothelin binding domain described herein binds an epitope within amino acids 450-588 of SEQ ID NO: 278, e.g., wherein the epitope, in part or in whole, can be found within amino acids 450-588, within amino acids 480-580, or within amino acids 485-572 of SEQ ID NO: 278.
- the epitope recognized by an anti-mesothelin binding domain described herein comprises a sequence selected from amino acids 485-490, 498-507, 532-537, or 545-572 of hMSLN 296-588 , e.g., SEQ ID NO: 278, or any combination thereof.
- the epitope recognized by an anti- mesothelin binding domain described herein comprises one or more amino acids selected from 485-490, 498-507, 532-537, or 545-572 of hMSLN 296-588 , e.g., SEQ ID NO: 278, or any combination thereof.
- the anti-mesothelin binding domain comprises one or more (e.g., all three) light chain complementary determining region 1 (LC CDR1) , light chain complementary determining region 2 (LC CDR2) , and light chain complementary determining region 3 (LC CDR3) of a human anti-mesothelin binding domain selected from SEQ ID NOS: 39-62 and one or more (e.g., all three) heavy chain complementary determining region 1 (HC CDR1) , heavy chain complementary determining region 2 (HC CDR2) , and heavy chain complementary determining region 3 (HC CDR3) of a human anti-mesothelin binding domain selected from SEQ ID NOS: 39-62
- the human anti-mesothelin binding domain comprises a light chain variable region described herein (e.g., in Table 2) and/or a heavy chain variable region described herein (e.g., in Table 2) .
- the anti-mesothelin binding domain is a scFv comprising a light chain variable region and a heavy chain variable region of an amino acid sequence of Table 2.
- the anti-mesothelin binding domain (e.g., an scFV) comprises: a light chain variable region comprising an amino acid sequence having at least one, two or three modifications (e.g., substitutions) but not more than 30, 20 or 10 modifications (e.g., substitutions) of an amino acid sequence of a light chain variable region provided in Table 2, or a sequence with 95-99%identity to an amino acid sequence of Table 2; and/or a heavy chain variable region comprising an amino acid sequence having at least one, two or three modifications (e.g., substitutions) but not more than 30, 20 or 10 modifications (e.g., substitutions) of an amino acid sequence of a heavy chain variable region provided in Table 2, or a sequence with 95-99%identity to an amino acid sequence of Table 2.
- the human anti-mesothelin binding domain comprises a sequence selected from a group consisting of SEQ ID NOS: 39-62, or a sequence with 95-99%identify thereof.
- the nucleic acid sequence encoding the human anti-mesothelin binding domain comprises a sequence selected from a group consisting of SEQ ID NO: 87-110, or a sequence with 95-99%identify thereof.
- the human anti-mesothelin binding domain is a scFv, and a light chain variable region comprising an amino acid sequence described herein, e.g., in Table 2 or 3, is attached to a heavy chain variable region comprising an amino acid sequence described herein, e.g., in Table 2 or 3, via a linker, e.g., a linker described herein.
- the humanized anti-mesothelin binding domain includes a (Gly4-Ser) n linker (SEQ ID NO: 26) , wherein n is 1, 2, 3, 4, 5, or 6, preferably 3 or 4.
- the light chain variable region and heavy chain variable region of a scFv can be, e.g., in any of the following orientations: light chain variable region-linker-heavy chain variable region or heavy chain variable region-linker-light chain variable region.
- the antigen binding domain portion comprises one or more sequence selected from SEQ ID NOS: 39-62.
- the CAR is selected from one or more sequence selected from SEQ ID NOS: 63-86.
- the antibodies of the invention may exist in a variety of other forms including, for example, Fab, Fab', F (ab') 2 , Fv fragments, scFv antibody fragments, disulfide-linked Fvs (sdFv) , a Fd fragment consisting of the VH and CH1 domains, linear antibodies, single domain antibodies such as sdAb (either VL or VH) , camelid VHH domains, multi-specific antibodies formed from antibody fragments such as a bivalent fragment comprising two Fab fragments linked by a disulfide brudge at the hinge region, and an isolated CDR or other epitope binding fragments of an antibody.
- the antibody fragment provided herein is a scFv.
- a human scFv may also be derived from a yeast display library.
- a display library is a collection of entities; each entity includes an accessible polypeptide component and a recoverable component that encodes or identifies the polypeptide component.
- the polypeptide component is varied so that different amino acid sequences are represented.
- the polypeptide component can be of any length, e.g. from three amino acids to over 300 amino acids.
- a display library entity can include more than one polypeptide component, for example, the two polypeptide chains of a Fab.
- a display library can be used to identify an anti-mesothelin binding domain.
- the polypeptide component of each member of the library is probed with mesothelin, or a fragment there, and if the polypeptide component binds to the mesothelin, the display library member is identified, typically by retention on a support.
- Retained display library members are recovered from the support and analyzed.
- the analysis can include amplification and a subsequent selection under similar or dissimilar conditions. For example, positive and negative selections can be alternated.
- the analysis can also include determining the amino acid sequence of the polypeptide component, i.e., the anti- mesothelin binding domain, and purification of the polypeptide component for detailed characterization.
- a variety of formats can be used for display libraries. Examples include the phage display.
- the protein component is typically covalently linked to a bacteriophage coat protein.
- the linkage results from translation of a nucleic acid encoding the protein component fused to the coat protein.
- the linkage can include a flexible peptide linker, a protease site, or an amino acid incorporated as a result of suppression of a stop codon.
- Phage display is described, for example, in U.S.
- Bacteriophage displaying the protein component can be grown and harvested using standard phage preparatory methods, e.g. PEG precipitation from growth media. After selection of individual display phages, the nucleic acid encoding the selected protein components can be isolated from cells infected with the selected phages or from the phage themselves, after amplification. Individual colonies or plaques can be picked, the nucleic acid isolated and sequenced.
- Other display formats include cell based display (see, e.g., WO 03/029456) , protein-nucleic acid fusions (see, e.g., US 6, 207, 446) , ribosome display (See, e.g., Mattheakis et al. (1994) Proc. Natl. Acad. Sci. USA 91: 9022 and Hanes et al. (2000) Nat Biotechnol. 18: 1287-92; Hanes et al. (2000) Methods Enzymol. 328: 404-30; and Schaffitzel et al. (1999) J Immunol Methods. 231 (1-2) : 119-35) , and E. coli periplasmic display (J Immunol Methods. 2005 Nov 22; PMID: 16337958) .
- mesothelin or a fragment thereof can be used as an antigen in a non-human animal, e.g., a rodent.
- the non-human animal includes at least a part of a human immunoglobulin gene.
- a human immunoglobulin gene For example, it is possible to engineer mouse strains deficient in mouse antibody production with large fragments of the human Ig loci.
- antigen-specific monoclonal antibodies (Mabs) derived from the genes with the desired specificity may be produced and selected. See, e.g., XENOMOUSE TM , Green et al., 1994, Nat. Gen. 7: 13-21; U.S. 2003-0070185, WO 96/34096, published Oct. 31, 1996, and PCT Application No. PCT/US96/05928, filed Apr. 29, 1996.
- scFvs can be prepared according to method known in the art (see, for example, Bird et al., (1988) Science 242: 423-426 and Huston et al., (1988) Proc. Natl. Acad. Sci. USA 85: 5879-5883) .
- ScFv molecules can be produced by linking VH and VL regions together, e.g., using flexible polypeptide linkers.
- the scFv molecules can comprise a linker (e.g., a Ser-Gly linker) with an optimized length and/or amino acid composition. The linker length can greatly affect how the variable regions of an scFv fold and interact.
- a short polypeptide linker e.g., between 5-10 amino acids
- intrachain folding is prevented.
- Interchain folding is also required to bring the two variable regions together to form a functional epitope binding site.
- linker orientation and size see, e.g., Hollinger et al. 1993 Proc Natl Acad. Sci. U.S.A. 90: 6444-6448, U.S. Patent Application Publication Nos. 2005/0100543, 2005/0175606, 2007/0014794, and PCT publication Nos. WO2006/020258 and WO2007/024715, is incorporated herein by reference.
- An scFv can comprise a linker of at least 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 25, 30, 35, 40, 45, 50, or more amino acid residues between its VL and VH regions.
- the linker sequence may comprise any naturally occurring amino acid.
- the linker sequence comprises amino acids glycine and serine.
- the linker sequence comprises sets of glycine and serine repeats such as (Gly 4 Ser) n , where n is a positive integer equal to or greater than 1. (SEQ ID NO: 135)
- the linker can be (Gly 4 Ser) 4 (SEQ ID NO: 27) or (Gly 4 Ser) 3 (SEQ ID NO: 28) . Variation in the linker length may retain or enhance activity, giving rise to superior efficacy in activity studies.
- an anti-mesothelin binding domain e.g., scFv molecules (e.g., soluble scFv)
- scFv molecules e.g., soluble scFv
- biophysical properties e.g., thermal stability
- the human scFv has a thermal stability that is greater than about 0.1, about 0.25, about 0.5, about 0.75, about 1, about 1.25, about 1.5, about 1.75, about 2, about 2.5, about 3, about 3.5, about 4, about 4.5, about 5, about 5.5, about 6, about 6.5, about 7, about 7.5, about 8, about 8.5, about 9, about 9.5, about 10 degrees, about 11 degrees, about 12 degrees, about 13 degrees, about 14 degrees, or about 15 degrees Celsius than a control binding molecule (e.g. a conventional scFv molecule) in the described assays.
- a control binding molecule e.g. a conventional scFv molecule
- the improved thermal stability of the anti-mesothelin binding domain is subsequently conferred to the entire mesothelin CAR construct, leading to improved therapeutic properties of the mesothelin CAR construct.
- the thermal stability of the anti-mesothelin binding domain, e.g., scFv can be improved by at least about 2°C or 3°C as compared to a conventional antibody.
- the anti-mesothelin binding domain, e.g., scFv has a 1°C improved thermal stability as compared to a conventional antibody.
- the anti-mesothelin binding domain e.g., scFv
- the anti-mesothelin binding domain e.g., scFv
- Comparisons can be made, for example, between the scFv molecules disclosed herein and scFv molecules or Fab fragments of an antibody from which the scFv VH and VL were derived.
- Thermal stability can be measured using methods known in the art. For example, in one embodiment, Tm can be measured. Methods for measuring Tm and other methods of determining protein stability are described in more detail below.
- the anti-mesothelin binding domain comprises at least one mutation such that the mutated anti-mesothelin binding domain, e.g., scFv, confers improved stability to the anti-mesothelin construct.
- the anti-mesothelin binding domain e.g., scFv
- the binding capacity of the mutant scFvs can be determined using assays described in the Examples. Binding Affinity
- An exemplary method for determining binding affinity employs surface plasmon resonance.
- Surface plasmon resonance is an optical phenomenon that allows for the analysis of real-time biospecific interactions by detection of alterations in protein concentrations within a biosensor matrix, for example using the BIAcore system (Pharmacia Biosensor AB, Uppsala, Sweden and Piscataway, N.J. ) .
- BIAcore Phharmacia Biosensor AB, Uppsala, Sweden and Piscataway, N.J.
- the portion of a CAR composition of the invention comprising an antibody or fragment thereof comprises amino acid sequences that are homologous to the amino acid sequences described herein, and wherein the antibody or fragment thereof retains the desired functional properties of the anti-mesothelin antibody fragments of the invention.
- the CAR composition of the invention comprises an antibody fragment.
- that antibody fragment comprises an scFv.
- the portion comprising an antibody or antibody fragment of the CAR composition of the invention is engineered by modifying one or more amino acids within one or both variable regions (i.e., VH and/or VL) , for example within one or more CDR regions and/or within one or more framework regions.
- the CAR composition of the invention comprises an antibody fragment.
- that antibody fragment comprises an scFv.
- the antibody or antibody fragment of the invention may further be modified such that they vary in amino acid sequence (e.g., from wild-type) , but not in desired activity.
- additional nucleotide substitutions leading to amino acid substitutions at "non-essential" amino acid residues may be made to the protein
- a nonessential amino acid residue in a molecule may be replaced with another amino acid residue from the same side chain family.
- a string of amino acids can be replaced with a structurally similar string that differs in order and/or composition of side chain family members, i.e., a conservative substitution, in which an amino acid residue is replaced with an amino acid residue having a similar side chain, may be made.
- Families of amino acid residues having similar side chains have been defined in the art, including basic side chains (e.g., lysine, arginine, histidine) , acidic side chains (e.g., aspartic acid, glutamic acid) , uncharged polar side chains (e.g., glycine, asparagine, glutamine, serine, threonine, tyrosine, cysteine) , nonpolar side chains (e.g., alanine, valine, leucine, isoleucine, proline, phenylalanine, methionine, tryptophan) , beta-branched side chains (e.g., threonine, valine, isoleucine) and aromatic side chains (e.g., tyrosine, phenylalanine, tryptophan, histidine) .
- basic side chains e.g., lysine, arginine, histidine
- acidic side chains
- Percent identity in the context of two or more nucleic acids or polypeptide sequences refers to two or more sequences that are the same. Two sequences are "substantially identical" if two sequences have a specified percentage of amino acid residues or nucleotides that are the same (i.e., 60%identity, optionally 70%, 71%. 72%.
- the identity exists over a region that is at least about 50 nucleotides (or 10 amino acids) in length, or more preferably over a region that is 100 to 500 or 1000 or more nucleotides (or 20, 50, 200 or more amino acids) in length.
- sequence comparison typically one sequence acts as a reference sequence, to which test sequences are compared.
- test and reference sequences are entered into a computer, subsequence coordinates are designated, if necessary, and sequence algorithm program parameters are designated. Default program parameters can be used, or alternative parameters can be designated.
- sequence comparison algorithm then calculates the percent sequence identities for the test sequences relative to the reference sequence, based on the program parameters.
- Methods of alignment of sequences for comparison are well known in the art. Optimal alignment of sequences for comparison can be conducted, e.g., by the local homology algorithm of Smith and Waterman, (1970) Adv. Appl. Math. 2: 482c, by the homology alignment algorithm of Needleman and Wunsch, (1970) J.
- BLAST and BLAST 2.0 algorithms Two examples of algorithms that are suitable for determining percent sequence identity and sequence similarity are the BLAST and BLAST 2.0 algorithms, which are described in Altschul et al., (1977) Nuc. Acids Res. 25: 3389-3402; and Altschul et al., (1990) J. Mol. Biol. 215: 403-410, respectively.
- Software for performing BLAST analyses is publicly available through the National Center for Biotechnology Information.
- the percent identity between two amino acid sequences can also be determined using the algorithm of E. Meyers and W. Miller, (1988) Comput. Appl. Biosci. 4: 11-17) which has been incorporated into the ALIGN program (version 2.0) , using a PAM120 weight residue table, a gap length penalty of 12 and a gap penalty of 4.
- the percent identity between two amino acid sequences can be determined using the Needleman and Wunsch (1970) J. Mol. Biol. 48:444-453) algorithm which has been incorporated into the GAP program in the GCG software package (available at www. gcg. com) , using either a Blossom 62 matrix or a PAM250 matrix, and a gap weight of 16, 14, 12, 10, 8, 6, or 4 and a length weight of 1, 2, 3, 4, 5, or 6.
- the present invention contemplates modifications of the starting antibody or fragment (e.g., scFv) amino acid sequence that generate functionally equivalent molecules.
- the VH or VL of an anti-mesothelin binding domain, e.g., scFv comprised in the CAR can be modified to retain at least about 70%, 71%. 72%.
- the present invention contemplates modifications of the entire CAR construct, e.g., modifications in one or more amino acid sequences of the various domains of the CAR construct in order to generate functionally equivalent molecules.
- the CAR construct can be modified to retain at least about 70%, 71%. 72%.
- a CAR can be designed to comprise a transmembrane domain that is attached to the extracellular domain of the CAR.
- a transmembrane domain can include one or more additional amino acids adjacent to the transmembrane region, e.g., one or more amino acid associated with the extracellular region of the protein from which the transmembrane was derived (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 up to 15 amino acids of the extracellular region) and/or one or more additional amino acids associated with the intracellular region of the protein from which the transmembrane protein is derived (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 up to 15 amino acids of the intracellular region) .
- the transmembrane domain is one that is associated with one of the other domains of the CAR is used, e.g., in one embodiment, the transmembrane domain may be from the same protein that the signaling domain, costimulatory domain or the hinge domain is derived from. In another aspect, the transmembrane domain is not derived from the same protein that any other domain of the CAR is derived from. In some instances, the transmembrane domain can be selected or modified by amino acid substitution to avoid binding of such domains to the transmembrane domains of the same or different surface membrane proteins, e.g., to minimize interactions with other members of the receptor complex.
- the transmembrane domain is capable of homodimerization with another CAR on the cell surface of a CAR-expressing cell.
- the amino acid sequence of the transmembrane domain may be modified or substituted so as to minimize interactions with the binding domains of the native binding partner present in the same CAR-expressing cell.
- the transmembrane domain may be derived either from a natural or from a recombinant source. Where the source is natural, the domain may be derived from any membrane-bound or transmembrane protein. In one aspect, the transmembrane domain is capable of signaling to the intracellular domain (s) whenever the CAR has bound to a target.
- a transmembrane domain of particular use in this invention may include at least the transmembrane domain (s) of, e.g., the alpha, beta or zeta chain of the T-cell receptor, CD28, CD3 epsilon, CD45, CD4, CD5, CD8 (e.g., CD8 alpha, CD8 beta) , CD9, CD16, CD22, CD33, CD37, CD64, CD80, CD86, CD134, CD137, CD154.
- s transmembrane domain of, e.g., the alpha, beta or zeta chain of the T-cell receptor, CD28, CD3 epsilon, CD45, CD4, CD5, CD8 (e.g., CD8 alpha, CD8 beta) , CD9, CD16, CD22, CD33, CD37, CD64, CD80, CD86, CD134, CD137, CD154.
- a transmembrane domain may include at least the transmembrane region (s) of, e.g., KIRDS2, OX40, CD2, CD27, LFA-1 (CD11a, CD18) , ICOS (CD278) , 4-1BB (CD137) , GITR, CD40, BAFFR, HVEM (LIGHTR) , SLAMF7, NKp80 (KLRF1) , NKp44, NKp30, NKp46, CD160, CD19, IL2R beta, IL2R gamma, IL7R ⁇ , ITGA1, VLA1, CD49a, ITGA4, IA4, CD49D, ITGA6, VLA-6, CD49f, ITGAD, CD11d, ITGAE, CD103, ITGAL, CD11a, LFA-1, ITGAM, CD11b, ITGAX, CD11c, ITGB1, CD29, ITGB2, CD18, LFA-1, ITGB7, TN
- s
- the transmembrane domain can be attached to the extracellular region of the CAR, e.g., the antigen binding domain of the CAR, via a hinge, e.g., a hinge from a human protein.
- the hinge can be a human Ig (immunoglobulin) hinge (e.g., an IgG4 hinge, an IgD hinge) , a GS linker (e.g., a GS linker described herein) , a KIR2DS2 hinge or a CD8a hinge.
- the hinge or spacer comprises (e.g., consists of) the amino acid sequence of SEQ ID NO: 2.
- the transmembrane domain comprises (e.g., consists of) a transmembrane domain of SEQ ID NO: 6.
- the hinge or spacer comprises an IgG4 hinge.
- the hinge or spacer comprises a hinge of the amino acid sequence as follows:
- the hinge or spacer comprises a hinge encoded by a nucleotide sequence as follows:
- the hinge or spacer comprises an IgD hinge.
- the hinge or spacer comprises a hinge of the amino acid sequence
- the hinge or spacer comprises a hinge encoded by a nucleotide sequence of
- the transmembrane domain may be recombinant, in which case it will comprise predominantly hydrophobic residues such as leucine and valine.
- a triplet of phenylalanine, tryptophan and valine can be found at each end of a recombinant transmembrane domain.
- a short oligo-or polypeptide linker may form the linkage between the transmembrane domain and the cytoplasmic signaling region of the CAR.
- a glycine-serine doublet provides a particularly suitable linker.
- the linker comprises the amino acid sequence of
- the linker is encoded by a nucleotide sequence of
- the hinge or spacer comprises a KIR2DS2 hinge and portions thereof.
- the cytoplasmic domain or region of the CAR includes an intracellular signaling domain.
- An intracellular signaling domain is generally responsible for activation of at least one of the normal effector functions of the immune cell in which the CAR has been introducede.
- effector function refers to a specialized function of a cell. Effector function of a T cell, for example, may be cytolytic activity or helper activity including the secretion of cytokines.
- intracellular signaling domain refers to the portion of a protein which transduces the effector function signal and directs the cell to perform a specialized function. While usually the entire intracellular signaling domain can be employed, in many cases it is not necessary to use the entire chain.
- intracellular signaling domain is thus meant to include any truncated portion of the intracellular signaling domain sufficient to transduce the effector function signal.
- intracellular signaling domains for use in the CAR of the invention include the cytoplasmic sequences of the T cell receptor (TCR) and co-receptors that act in concert to initiate signal transduction following antigen receptor engagement, as well as any derivative or variant of these sequences and any recombinant sequence that has the same functional capability.
- TCR T cell receptor
- T cell activation can be said to be mediated by two distinct classes of cytoplasmic signaling sequences: those that initiate antigen-dependent primary activation through the TCR (primary intracellular signaling domains) and those that act in an antigen-independent manner to provide a secondary or costimulatory signal (secondary cytoplasmic domain, e.g., a costimulatory domain) .
- a primary cytoplasmic signaling domain regulates primary activation of the TCR complex either in a stimulatory way, or in an inhibitory way.
- Primary intracellular signaling domains that act in a stimulatory manner may contain signaling motifs which are known as immunoreceptor tyrosine-based activation motifs or ITAMs.
- ITAM containing primary intracellular signaling domains examples include those of CD3 zeta, common FcR gamma (FCER1G) , Fc gamma RIIa, , FcR beta (Fc Epsilon R1b) , CD3 gamma, CD3 delta , CD3 epsilon, , CD79a, CD79b, DAP10, and DAP12.
- a CAR of the invention comprises an intracellular signaling domain, e.g., a primary signaling domain of CD3-zeta.
- a primary signaling domain comprises a modified ITAM domain, e.g., a mutated ITAM domain which has altered (e.g., increased or decreased) activity as compared to the native ITAM domain.
- a primary signaling domain comprises a modified ITAM-containing primary intracellular signaling domain, e.g., an optimized and/or truncated ITAM-containing primary intracellular signaling domain.
- a primary signaling domain comprises one, two, three, four or more ITAM motifs.
- molecules containing a primary intracellular signaling domain that are of particular use in the invention include those of DAP10, DAP12, and CD32.
- the intracellular domain of the CAR can comprise the CD3-zeta signaling domain by itself or it can be combined with any other desired intracellular signaling domain (s) useful in the context of a CAR of the invention.
- the intracellular signaling domain of the CAR can comprise a CD3 zeta chain portion and a costimulatory signaling domain.
- the costimulatory signaling domain refers to a portion of the CAR comprising the intracellular domain of a costimulatory molecule.
- a costimulatory molecule is a cell surface molecule other than an antigen receptor or its ligands that is required for an efficient response of lymphocytes to an antigen.
- CD27 costimulation has been demonstrated to enhance expansion, effector function, and survival of human CART cells in vitro and augments human T cell persistence and antitumor activity in vivo (Song et al. Blood. 2012; 119 (3) : 696-706) .
- costimulatory molecules include CDS, ICAM-1, GITR, BAFFR, HVEM (LIGHTR) , SLAMF7, NKp80 (KLRF1) , NKp44, NKp30, NKp46, CD160, CD19, CD4, CD8alpha, CD8beta, IL2R beta, IL2R gamma, IL7R alpha, ITGA4, VLA1, CD49a, ITGA4, IA4, CD49D, ITGA6, VLA-6, CD49f, ITGAD, CD11d, ITGAE, CD103, ITGAL, CD11a, LFA-1, ITGAM, CD11b, ITGAX, CD11c, ITGB1, CD29, ITGB2, CD18, LFA-1, ITGB7, TNFR2, TRANCE/RANKL, DNAM1 (CD226) , SLAMF4 (CD244, 2B4) , CD84, CD96 (Tactile) , NKG2D, CEACAM1,
- the intracellular signaling domains within the cytoplasmic portion of the CAR of the invention may be linked to each other in a random or specified order.
- a short oligo-or polypeptide linker for example, between 2 and 10 amino acids (e.g., 2, 3, 4, 5, 6, 7, 8, 9, or 10 amino acids) in length may form the linkage between intracellular signaling domains.
- a glycine-serine doublet can be used as a suitable linker.
- a single amino acid e.g., an alanine, a glycine, can be used as a suitable linker.
- the intracellular signaling domain is designed to comprise two or more, e.g., 2, 3, 4, 5, or more, costimulatory signaling domains.
- the two or more, e.g., 2, 3, 4, 5, or more, costimulatory signaling domains are separated by a linker molecule, e.g., a linker molecule described herein.
- the intracellular signaling domain comprises two costimulatory signaling domains.
- the linker molecule is a glycine residue. In some embodiments, the linker is an alanine residue.
- the intracellular signaling domain is designed to comprise the signaling domain of CD3-zeta and the signaling domain of CD28. In one aspect, the intracellular signaling domain is designed to comprise the signaling domain of CD3-zeta and the signaling domain of 4-1BB. In one aspect, the signaling domain of 4-1BB is a signaling domain of SEQ ID NO: 16. In one aspect, the signaling domain of CD3-zeta is a signaling domain of SEQ ID NO: 17.
- the intracellular signaling domain is designed to comprise the signaling domain of CD3-zeta and the signaling domain of CD27.
- the signaling domain of CD27 comprises an amino acid sequence of
- the signalling domain of CD27 is encoded by a nucleic acid sequence of
- the CAR-expressing cell described herein can further comprise a second CAR, e.g., a second CAR that includes a different antigen binding domain, e.g., to the same target (mesothelin) or a different target (e.g., a target other than mesothelin on stroma cells, e.g., FAP; a target other than mesothelin on prostate cancer cells, e.g., androgen receptor, OR51E2, PSMA, PSCA, PDGRF- ⁇ , TARP, GloboH, MAD-CT-1, or MAD-CT-2; a target other than mesothelin on ovararian cancer cells, e.g., Tn, PRSS21, CD171, Lewis Y, folate receptor ⁇ , claudin6, GloboH, or sperm protein 17, e.g., a target other than mesothelin on lung cancer cells, e.g., VEGF,
- the CAR-expressing cell comprises a first CAR that targets a first antigen and includes an intracellular signaling domain having a costimulatory signaling domain but not a primary signaling domain, and a second CAR that targets a second, different, antigen and includes an intracellular signaling domain having a primary signaling domain but not a costimulatory signaling domain.
- Placement of a costimulatory signaling domain, e.g., 4-1BB, CD28, CD27 or OX-40, onto the first CAR, and the primary signaling domain, e.g., CD3 zeta, on the second CAR can limit the CAR activity to cells where both targets are expressed.
- the CAR expressing cell comprises a first mesothelin CAR that includes a mesothelin binding domain, a transmembrane domain and a costimulatory domain and a second CAR that targets an antigen other than mesothelin (e.g., a target other than mesothelin on stroma cells, e.g., FAP; a target other than mesothelin on prostate cancer cells, e.g., androgen receptor, OR51E2, PSMA, PSCA, PDGRF- ⁇ , TARP, GloboH, MAD-CT-1, or MAD-CT-2; a target other than mesothelin on ovararian cancer cells, e.g., Tn, PRSS21, CD171, Lewis Y, folate receptor ⁇ , claudin6, GloboH, or sperm protein 17, e.g., a target other than mesothelin on lung cancer cells, e.g.
- the CAR expressing cell comprises a first mesothelin CAR that includes a mesothelin binding domain, a transmembrane domain and a primary signaling domain and a second CAR that targets an antigen other than mesothelin (e.g., a target other than mesothelin on stroma cells, e.g., FAP; a target other than mesothelin on prostate cancer cells, e.g., androgen receptor, OR51E2, PSMA, PSCA, PDGRF- ⁇ , TARP, GloboH, MAD-CT-1, or MAD-CT-2; a target other than mesothelin on ovararian cancer cells, e.g., Tn, PRSS21, CD171, Lewis Y, folate receptor ⁇ , claudin6, GloboH, or sperm protein 17, e.g., a target other than mesothelin on lung cancer cells, e.g.,
- the CAR-expressing cell comprises a mesothelin CAR described herein and an inhibitory CAR.
- the inhibitory CAR comprises an antigen binding domain that binds an antigen found on normal cells but not cancer cells, e.g., normal cells that also express mesothelin.
- the inhibitory CAR comprises the antigen binding domain, a transmembrane domain and an intracellular domain of an inhibitory molecule.
- the intracellular domain of the inhibitory CAR can be an intracellular domain of PD1, PD-L1, CTLA4, TIM3, CEACAM (e.g., CEACAM-1, CEACAM-3 and/or CEACAM-5) , LAG3, VISTA, BTLA, TIGIT, LAIR1, CD160, 2B4 and TGFR beta.
- CEACAM e.g., CEACAM-1, CEACAM-3 and/or CEACAM-5
- LAG3, VISTA BTLA
- TIGIT LAIR1, CD160, 2B4 and TGFR beta.
- the antigen binding domains of the different CARs can be such that the antigen binding domains do not interact with one another.
- a cell expressing a first and second CAR can have an antigen binding domain of the first CAR, e.g., as a fragment, e.g., an scFv, that does not form an association with the antigen binding domain of the second CAR, e.g., the antigen binding domain of the second CAR is a VHH.
- the antigen binding domain comprises a single domain antigen binding (SDAB) molecules include molecules whose complementary determining regions are part of a single domain polypeptide. Examples include, but are not limited to, heavy chain variable domains, binding molecules naturally devoid of light chains, single domains derived from conventional 4-chain antibodies, engineered domains and single domain scaffolds other than those derived from antibodies. SDAB molecules may be any of the art, or any future single domain molecules. SDAB molecules may be derived from any species including, but not limited to mouse, human, camel, llama, lamprey, fish, shark, goat, rabbit, and bovine. This term also includes naturally occurring single domain antibody molecules from species other than Camelidae and sharks.
- SDAB single domain antigen binding
- an SDAB molecule can be derived from a variable region of the immunoglobulin found in fish, such as, for example, that which is derived from the immunoglobulin isotype known as Novel Antigen Receptor (NAR) found in the serum of shark.
- NAR Novel Antigen Receptor
- an SDAB molecule is a naturally occurring single domain antigen binding molecule known as heavy chain devoid of light chains.
- Such single domain molecules are disclosed in WO 9404678 and Hamers-Casterman, C. et al. (1993) Nature 363: 446-448, for example.
- this variable domain derived from a heavy chain molecule naturally devoid of light chain is known herein as a VHH or nanobody to distinguish it from the conventional VH of four chain immunoglobulins.
- a VHH molecule can be derived from Camelidae species, for example in camel, llama, dromedary, alpaca and guanaco. Other species besides Camelidae may produce heavy chain molecules naturally devoid of light chain; such VHHs are within the scope of the invention.
- the SDAB molecules can be recombinant, CDR-grafted, humanized, camelized, de-immunized and/or in vitro generated (e.g., selected by phage display) .
- cells having a plurality of chimeric membrane embedded receptors comprising an antigen binding domain that interactions between the antigen binding domain of the receptors can be undesirable, e.g., because it inhibits the ability of one or more of the antigen binding domains to bind its cognate antigen.
- cells having a first and a second non-naturally occurring chimeric membrane embedded receptor comprising antigen binding domains that minimize such interactions are also disclosed herein.
- nucleic acids encoding a first and a second non-naturally occurring chimeric membrane embedded receptor comprising an antigen binding domains that minimize such interactions, as well as methods of making and using such cells and nucleic acids.
- the antigen binding domain of one of the first and the second non-naturally occurring chimeric membrane embedded receptor comprises an scFv, and the other comprises a single VH domain, e.g., a camelid, shark, or lamprey single VH domain, or a single VH domain derived from a human or mouse sequence.
- the claimed invention comprises a first and second CAR, wherein the antigen binding domain of one of the first and the second CAR does not comprise a variable light domain and a variable heavy domain.
- the antigen binding domain of one of the first and the second CAR is an scFv, and the other is not an scFv.
- the antigen binding domain of one of the first and the second CAR comprises a single VH domain, e.g., a camelid, shark, or lamprey single VH domain, or a single VH domain derived from a human or mouse sequence.
- the antigen binding domain of one of the first and the second CAR comprises a nanobody.
- the antigen binding domain of one of the first and the second CAR comprises a camelid VHH domain.
- the antigen binding domain of one of the first and thesecond CAR comprises an scFv, and the other comprises a single VH domain, e.g., a camelid, shark, or lamprey single VH domain, or a single VH domain derived from a human or mouse sequence.
- the antigen binding domain of one of the first and the second CAR comprises an scFv, and the other comprises a nanobody.
- the antigen binding domain of one of the first and the second CAR comprises comprises an scFv, and the other comprises a camelid VHH domain.
- binding of the antigen binding domain of the first CAR to its cognate antigen is not substantially reduced by the presence of the second CAR. In some embodiments, binding of the antigen binding domain of the first CAR to its cognate antigen in the presence of the second CAR is 85%, 90%, 95%, 96%, 97%, 98%or 99%of binding of the antigen binding domain of the first CAR to its cognate antigen in the absence of the second CAR.
- the antigen binding domains of the first and the second CAR when present on the surface of a cell, associate with one another less than if both were scFv antigen binding domains. In some embodiments, the antigen binding domains of the first and the second CAR, associate with one another 85%, 90%, 95%, 96%, 97%, 98%or 99%less than if both were scFv antigen binding domains.
- the CAR-expressing cell described herein can further express another agent, e.g., an agent which enhances the activity or fitness of a CAR-expressing cell.
- the agent can be an agent which inhibits a molecule that modulates or regulates, e.g., inhibits, T cell function.
- the molecule that modulates or regulates T cell function is an inhibitory molecule.
- Inhibitory molecules, e.g., PD1 can, in some embodiments, decrease the ability of a CAR-expressing cell to mount an immune effector response.
- inhibitory molecules include PD1, PD-L1, CTLA4, TIM3, CEACAM (e.g., CEACAM-1, CEACAM-3 and/or CEACAM-5) , LAG3, VISTA, BTLA, TIGIT, LAIR1, CD 160, 2B4 and TGFR beta.
- CEACAM e.g., CEACAM-1, CEACAM-3 and/or CEACAM-5
- LAG3, VISTA, BTLA, TIGIT, LAIR1, CD 160, 2B4 and TGFR beta examples include PD1, PD-L1, CTLA4, TIM3, CEACAM (e.g., CEACAM-1, CEACAM-3 and/or CEACAM-5) , LAG3, VISTA, BTLA, TIGIT, LAIR1, CD 160, 2B4 and TGFR beta.
- an agent e.g., an inhibitory nucleic acid, e.g., a dsRNA, e.g., an siRNA or shRNA; or e.g., an inhibitory protein or system, e.g., a clustered regularly interspaced short palindromic repeats (CRISPR) , a transcription-activator like effector nuclease (TALEN) , or a zinc finger endonuclease (ZFN) , e.g., as described herein, can be used to inhibit expression of a molecule that modulates or regulates, e.g., inhibits, T-cell function in the CAR-expressing cell.
- CRISPR clustered regularly interspaced short palindromic repeats
- TALEN transcription-activator like effector nuclease
- ZFN zinc finger endonuclease
- the agent is an shRNA, e.g., an shRNA described herein.
- the agent that modulates or regulates, e.g., inhibits, T-cell function is inhibited within a CAR-expressing cell.
- a dsRNA molecule that inhibits expression of a molecule that modulates or regulates, e.g., inhibits, T-cell function is linked to the nucleic acid that encodes a component, e.g., all of the components, of the CAR.
- the agent which inhibits an inhibitory molecule comprises a first polypeptide, e.g., an inhibitory molecule, associated with a second polypeptide that provides a positive signal to the cell, e.g., an intracellular signaling domain described herein.
- the agent comprises a first polypeptide, e.g., of an inhibitory molecule such as PD1, PD-L1, CTLA4, TIM3, CEACAM (e.g., CEACAM-1, CEACAM-3 and/or CEACAM-5) , LAG3, VISTA, BTLA, TIGIT, LAIR1, CD160, 2B4 and TGFR beta T, or a fragment of any of these (e.g., at least a portion of an extracellular domain of any of these) , and a second polypeptide which is an intracellular signaling domain described herein (e.g., comprising a costimulatory domain (e.g., 41BB, CD27 or CD28, e.g., as described herein) and/or a primary signaling domain (e.g., a CD3 zeta signaling domain described herein) .
- an inhibitory molecule such as PD1, PD-L1, CTLA4, TIM3, CEACAM (e.g., CEACAM
- the agent comprises a first polypeptide of PD1 or a fragment thereof (e.g., at least a portion of an extracellular domain of PD1) , and a second polypeptide of an intracellular signaling domain described herein (e.g., a CD28 signaling domain described herein and/or a CD3 zeta signaling domain described herein) .
- PD1 is an inhibitory member of the CD28 family of receptors that also includes CD28, CTLA-4, ICOS, and BTLA.
- PD-1 is expressed on activated B cells, T cells and myeloid cells (Agata et al. 1996 Int. Immunol 8: 765-75) .
- PD-L1 Two ligands for PD1, PD-L1 and PD-L2 have been shown to downregulate T cell activation upon binding to PD1 (Freeman et a. 2000 J Exp Med 192: 1027-34; Latchman et al. 2001 Nat Immunol 2: 261-8; Carter et al. 2002 Eur J Immunol 32: 634-43) .
- PD-L1 is abundant in human cancers (Dong et al. 2003 J Mol Med 81: 281-7; Blank et al. 2005 Cancer Immunol. Immunother 54: 307-314; Konishi et al. 2004 Clin Cancer Res 10: 5094) . Immune suppression can be reversed by inhibiting the local interaction of PD1 with PD-L1.
- the agent comprises the extracellular domain (ECD) of an inhibitory molecule, e.g., Programmed Death 1 (PD1) , can be fused to a transmembrane domain and intracellular signaling domains such as 41BB and CD3 zeta (also referred to herein as a PD1 CAR) .
- the PD1 CAR when used in combinations with a mesothelin CAR described herein, improves the persistence of the T cell.
- the CAR is a PD1 CAR comprising the extracellular domain of PD1 indicated as underlined in SEQ ID NO: 24 and a signal sequence at amino acids 1-21 of SEQ ID NO: 24.
- the PD1 CAR comprises the amino acid sequence of SEQ ID NO: 24.
- the PD1 CAR without the N-terminal signal sequence comprises the amino acid sequence provided below (SEQ ID NO: 22) .
- the agent comprises a nucleic acid sequence encoding the PD1 CAR with the N-terminal signal sequence, e.g., the PD1 CAR described herein.
- the nucleic acid sequence for the PD1 CAR is shown below, with the PD1 ECD underlined below in SEQ ID NO: 23
- the present invention provides a population of CAR-expressing cells, e.g., CART cells.
- the population of CAR-expressing cells comprises a mixture of cells expressing different CARs.
- the population of CART cells can include a first cell expressing a CAR having an anti-CD19 binding domain described herein, and a second cell expressing a CAR having a different anti-CD19 binding domain, e.g., an anti-mesothelin binding domain described herein that differs from the anti-mesothelin binding domain in the CAR expressed by the first cell.
- the population of CAR-expressing cells can include a first cell expressing a CAR that includes an anti-mesothelin binding domain, e.g., as described herein, and a second cell expressing a CAR that includes an antigen binding domain to a target other than mesothelin (e.g., a target other than mesothelin on stroma cells, e.g., FAP; a target other than mesothelin on prostate cancer cells, e.g., androgen receptor, OR51E2, PSMA, PSCA, PDGRF- ⁇ , TARP, GloboH, MAD-CT-1, or MAD-CT-2; a target other than mesothelin on ovararian cancer cells, e.g., Tn, PRSS21, CD171, Lewis Y, folate receptor ⁇ , claudin6, GloboH, or sperm protein 17, e.g., a target other than mesothelin on lung
- the present invention provides a population of cells wherein at least one cell in the population expresses a CAR having an anti-mesothelin binding domain described herein, and a second cell expressing another agent, e.g., an agent which enhances the activity or function of a CAR-expressing cell.
- the agent can be an agent which modulates or regulates, e.g., inhibits, T cell function.
- the molecule that modulates or regulates T cell function is an inhibitory molecule, e.g., an agent described herein.
- Inhibitory molecules e.g., can, in some embodiments, decrease the ability of a CAR-expressing cell to mount an immune effector response.
- inhibitory molecules examples include PD1, PD-L1, CTLA4, TIM3, CEACAM (e.g., CEACAM-1, CEACAM-3 and/or CEACAM-5) , LAG3, VISTA, BTLA, TIGIT, LAIR1, CD160, 2B4 and TGFR beta.
- the agent which inhibits an inhibitory molecule comprises a first polypeptide, e.g., an inhibitory molecule, associated with a second polypeptide that provides a positive signal to the cell, e.g., an intracellular signaling domain described herein.
- the agent comprises a first polypeptide, e.g., of an inhibitory molecule such as PD1, PD-L1, CTLA4, TIM3, CEACAM (e.g., CEACAM-1, CEACAM-3 and/or CEACAM-5) , LAG3, VISTA, BTLA, TIGIT, LAIR1, CD160, 2B4 and TGFR beta, or a fragment of any of these (e.g., at least a portion of an extracellular domain of any of these) , and a second polypeptide which is an intracellular signaling domain described herein (e.g., comprising a costimulatory domain (e.g., 41BB, CD27 or CD28, e.g., as described herein) and/or a primary signaling domain (e.g., a CD3 zeta signaling domain described herein) .
- an inhibitory molecule such as PD1, PD-L1, CTLA4, TIM3, CEACAM (e.g., CEACAM-1
- the agent comprises a first polypeptide of PD1 or a fragment thereof (e.g., at least a portion of the extracellular domain of PD1) , and a second polypeptide of an intracellular signaling domain described herein (e.g., a CD28 signaling domain described herein and/or a CD3 zeta signaling domain described herein) .
- a first polypeptide of PD1 or a fragment thereof e.g., at least a portion of the extracellular domain of PD1
- a second polypeptide of an intracellular signaling domain described herein e.g., a CD28 signaling domain described herein and/or a CD3 zeta signaling domain described herein
- the present invention provides methods comprising administering a population of CAR-expressing cells, e.g., CART cells, e.g., a mixture of cells expressing different CARs, in combination with another agent, e.g., a kinase inhibitor, such as a kinase inhibitor described herein.
- a population of CAR-expressing cells e.g., CART cells, e.g., a mixture of cells expressing different CARs
- another agent e.g., a kinase inhibitor, such as a kinase inhibitor described herein.
- the present invention provides methods comprising administering a population of cells wherein at least one cell in the population expresses a CAR having an anti-mesoothelinbinding domain as described herein, and a second cell expressing another agent, e.g., an agent which enhances the activity or fitness of a CAR-expressing cell, in combination with another agent, e.g., a kinase inhibitor, such as a kinase inhibitor described herein.
- another agent e.g., an agent which enhances the activity or fitness of a CAR-expressing cell
- another agent e.g., a kinase inhibitor, such as a kinase inhibitor described herein.
- a regulatable CAR where the CAR activity can be controlled is desirable to optimize the safety and efficacy of a CAR therapy.
- CAR activities can be regulated. For example, inducible apoptosis using, e.g., a caspase fused to a dimerization domain (see, e.g., Di et al., N Egnl. J. Med. 2011 Nov. 3; 365 (18) : 1673-1683) , can be used as a safety switch in the CAR therapy of the instant invention.
- a RCAR comprises a set of polypeptides, typically two in the simplest embodiments, in which the components of a standard CAR described herein, e.g., an antigen binding domain and an intracellular signaling domain, are partitioned on separate polypeptides or members.
- the set of polypeptides include a dimerization switch that, upon the presence of a dimerization molecule, can couple the polypeptides to one another, e.g., can couple an antigen binding domain to an intracellular signaling domain.
- an RCAR comprises two polypeptides or members: 1) an intracellular signaling member comprising an intracellular signaling domain, e.g., a primary intracellular signaling domain described herein, and a first switch domain; 2) an antigen binding member comprising an antigen binding domain, e.g., that targets mesothelin as described herein, and a second switch domain.
- the RCAR comprises a transmembrane domain described herein.
- a transmembrane domain can be disposed on the intracellular signaling member, on the antigen binding member, or on both.
- the order is as set out in the text, but in other embodiments, the order can be different.
- the order of elements on one side of a transmembrane region can be different from the example, e.g., the placement of a switch domain relative to a intracellular signaling domain can be different, e.g., reversed) .
- the first and second switch domains can form an intracellular or an extracellular dimerization switch.
- the dimerization switch can be a homodimerization switch, e.g., where the first and second switch domain are the same, or a heterodimerization switch, e.g., where the first and second switch domain are different from one another.
- an RCAR can comprise a “multi switch. ”
- a multi switch can comprise heterodimerization switch domains or homodimerization switch domains.
- a multi switch comprises a plurality of, e.g., 2, 3, 4, 5, 6, 7, 8, 9, or 10, switch domains, independently, on a first member, e.g., an antigen binding member, and a second member, e.g., an intracellular signaling member.
- the first member can comprise a plurality of first switch domains, e.g., FKBP-based switch domains
- the second member can comprise a plurality of second switch domains, e.g., FRB-based switch domains.
- the first member can comprise a first and a second switch domain, e.g., a FKBP-based switch domain and a FRB-based switch domain
- the second member can comprise a first and a second switch domain, e.g., a FKBP-based switch domain and a FRB-based switch domain.
- the intracellular signaling member comprises one or more intracellular signaling domains, e.g., a primary intracellular signaling domain and one or more costimulatory signaling domains.
- the antigen binding member may comprise one or more intracellular signaling domains, e.g., one or more costimulatory signaling domains.
- the antigen binding member comprises a plurality, e.g., 2 or 3 costimulatory signaling domains described herein, e.g., selected from 41BB, CD28, CD27, ICOS, and OX40, and in embodiments, no primary intracellular signaling domain.
- the antigen binding member comprises the following costimulatory signaling domains, from the extracellular to intracellular direction: 41BB-CD27; 41BB-CD27; CD27-41BB; 41BB-CD28; CD28-41BB; OX40-CD28; CD28-OX40; CD28-41BB; or 41BB-CD28.
- the intracellular binding member comprises a CD3zeta domain.
- the RCAR comprises (1) an antigen binding member comprising, an antigen binding domain, e.g., described herein, a transmembrane domain, and two costimulatory domains and a first switch domain; and (2) an intracellular signaling domain comprising a transmembrane domain or membrane tethering domain and at least one primary intracellular signaling domain, and a second switch domain.
- An embodiment provides RCARs wherein the antigen binding member is not tethered to the surface of the CAR cell. This allows a cell having an intracellular signaling member to be conveniently paired with one or more antigen binding domains, without transforming the cell with a sequence that encodes the antigen binding member.
- the RCAR comprises: 1) an intracellular signaling member comprising: a first switch domain, a transmembrane domain, an intracellular signaling domain, e.g., a primary intracellular signaling domain, and a first switch domain; and 2) an antigen binding member comprising: an antigen binding domain, e.g., described herein, and a second switch domain, wherein the antigen binding member does not comprise a transmembrane domain or membrane tethering domain, and, optionally, does not comprise an intracellular signaling domain.
- the RCAR may further comprise 3) a second antigen binding member comprising: a second antigen binding domain, e.g., a second antigen binding domain that binds a different antigen than is bound by the antigen binding domain; and a second switch domain.
- the antigen binding member comprises bispecific activation and targeting capacity.
- the antigen binding member can comprise a plurality, e.g., 2, 3, 4, or 5 antigen binding domains, e.g., scFvs, wherein each antigen binding domain binds to a target antigen, e.g. different antigens or the same antigen, e.g., the same or different epitopes on the same antigen.
- the plurality of antigen binding domains are in tandem, and optionally, a linker or hinge region is disposed between each of the antigen binding domains. Suitable linkers and hinge regions are described herein.
- an embodiment provides RCARs having a configuration that allows switching of proliferation.
- the RCAR comprises: 1) an intracellular signaling member comprising: optionally, a transmembrane domain or membrane tethering domain; one or more co-stimulatory signaling domain, e.g., selected from 41BB, CD28, CD27, ICOS, and OX40, and a switch domain; and 2) an antigen binding member comprising: an antigen binding domain, e.g., described herein, a transmembrane domain, and a primary intracellular signaling domain, e.g., a CD3zeta domain, wherein the antigen binding member does not comprise a switch domain, or does not comprise a switch domain that dimerizes with a switch domain on the intracellular signaling member.
- an intracellular signaling member comprising: optionally, a transmembrane domain or membrane tethering domain; one or more co-stimulatory signaling domain, e.g., selected from 41BB, CD28
- the antigen binding member does not comprise a co-stimulatory signaling domain.
- the intracellular signaling member comprises a switch domain from a homodimerization switch.
- the intracellular signaling member comprises a first switch domain of a heterodimerization switch and the RCAR comprises a second intracellular signaling member which comprises a second switch domain of the heterodimerization switch.
- the second intracellular signaling member comprises the same intracellular signaling domains as the intracellular signaling member.
- the dimerization switch is intracellular. In an embodiment, the dimerization switch is extracellular.
- the first and second switch domains comprise a FKBP/FRB-based switch as described herein.
- RCARX cell Any cell that is engineered to express a RCAR can be used as a RCARX cell.
- the RCARX cell is a T cell, and is referred to as a RCART cell.
- the RCARX cell is an NK cell, and is referred to as a RCARN cell.
- nucleic acids and vectors comprising RCAR encoding sequences.
- Sequence encoding various elements of an RCAR can be disposed on the same nucleic acid molecule, e.g., the same plasmid or vector, e.g., viral vector, e.g., lentiviral vector.
- sequence encoding an antigen binding member and sequence encoding an intracellular signaling member can be present on the same nucleic acid, e.g., vector.
- Production of the corresponding proteins can be achieved, e.g., by the use of separate promoters, or by the use of a bicistronic transcription product (which can result in the production of two proteins by cleavage of a single translation product or by the translation of two separate protein products) .
- a sequence encoding a cleavable peptide e.g., a P2A or F2A sequence
- a sequence encoding an IRES e.g., an EMCV or EV71 IRES, is disposed between (i) and (ii) .
- (i) and (ii) are transcribed as a single RNA.
- a first promoter is operably linked to (i) and a second promoter is operably linked to (ii) , such that (i) and (ii) are transcribed as separate mRNAs.
- sequence encoding various elements of an RCAR can be disposed on the different nucleic acid molecules, e.g., different plasmids or vectors, e.g., viral vector, e.g., lentiviral vector.
- the (i) sequence encoding an antigen binding member can be present on a first nucleic acid, e.g., a first vector
- the (ii) sequence encoding an intracellular signaling member can be present on the second nucleic acid, e.g., the second vector.
- Dimerization switches can be non-covalent or covalent.
- the dimerization molecule promotes a non-covalent interaction between the switch domains.
- the dimerization molecule promotes a covalent interaction between the switch domains.
- the RCAR comprises a FKBP/FRAP, or FKBP/FRB, -based dimerization switch.
- FKBP12 FKBP, or FK506 binding protein
- FKBP is an abundant cytoplasmic protein that serves as the initial intracellular target for the natural product immunosuppressive drug, rapamycin. Rapamycin binds to FKBP and to the large PI3K homolog FRAP (RAFT, mTOR) .
- FRB is a 93 amino acid portion of FRAP, that is sufficient for binding the FKBP-rapamycin complex (Chen, J., Zheng, X.F., Brown, E.J. &Schreiber, S.L.
- an FKBP/FRAP e.g., an FKBP/FRB
- a dimerization molecule e.g., rapamycin or a rapamycin analog.
- amino acid sequence of FKBP is as follows:
- an FKBP switch domain can comprise a FRB binding fragment of FKBP, e.g., the underlined portion of SEQ ID NO: 382, which is:
- amino acid sequence of FRB is as follows:
- FKBP/FRAP e.g., an FKPP/FRB, based switch
- a dimerization switch comprising: a first switch domain, comprises an FRB binding fragment or an FKBP analog, e.g., RAD001, and has at least 70, 75, 80, 85, 90, 95, 96, 97, 98, or 99% identity with, or differs by no more than 30, 25, 20, 15, 10, 5, 4, 3, 2, or 1 amino acid residues from, the FKBP sequence of SEQ ID NO: 382 or 383; and a second switch domain, which comprises an FKBP binding fragment or an FRB analog, and has at least 70, 75, 80, 85, 90, 95, 96, 97, 98, or 99% identity with, or differs by no more than 30, 25, 20, 15, 10, 5, 4, 3, 2, or 1 amino acid residues from, the FRB sequence of SEQ ID NO: 384.
- a RCAR described herein comprises one switch domain comprises amino acid
- the FKBP/FRB dimerization switch comprises a modified FRB switch domain that exhibits altered, e.g., increased, affinity for the dimerization molecule, e.g., rapamycin or a rapalogue, e.g., RAD001.
- the modified FRB switch domain comprises one or more mutations, e.g., 2, 3, 4, 5, 6, 7, 8, 9, 10 or more, selected from mutations at amino acid position (s) L2031, E2032, S2035, R2036, F2039, G2040, T2098, W2101, D2102, Y2105, and F2108, where the wild-type amino acid is mutated to any other naturally-occurring amino acid.
- a mutant FRB comprises a mutation at E2032, where E2032 is mutated to phenylalanine (E2032F) , methionine (E2032M) , arginine (E2032R) , valine (E2032V) , tyrosine (E2032Y) , isoleucine (E2032I) , e.g., SEQ ID NO: 385, or leucine (E2032L) , e.g., SEQ ID NO: 386.
- a mutant FRB comprises a mutation at T2098, where T2098 is mutated to phenylalanine (T2098F) or leucine (T2098L) , e.g., SEQ ID NO: 387.
- a mutant FRB comprises a mutation at E2032 and at T2098, where E2032 is mutated to any amino acid, and where T2098 is mutated to any amino acid, e.g., SEQ ID NO: 388.
- a mutant FRB comprises an E2032I and a T2098L mutation, e.g., SEQ ID NO: 389.
- a mutant FRB comprises an E2032L and a T2098L mutation, e.g., SEQ ID NO: 340.
- dimerization switches include a GyrB-GyrB based dimerization switch, a Gibberellin-based dimerization switch, a tag/binder dimerization switch, and a halo-tag/snap- tag dimerization switch. Following the guidance provided herein, such switches and relevant dimerization molecules will be apparent to one of ordinary skill.
- association between the switch domains is promoted by the dimerization molecule.
- association or association between switch domains allows for signal transduction between a polypeptide associated with, e.g., fused to, a first switch domain, and a polypeptide associated with, e.g., fused to, a second switch domain.
- signal transduction is increased by 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 5, 10, 50, 100 fold, e.g., as measured in a system described herein.
- Rapamycin and rapamycin analogs can be used as dimerization molecules in a FKBP/FRB-based dimerization switch described herein.
- the dimerization molecule can be selected from rapamycin (sirolimus) , RAD001 (everolimus) , zotarolimus, temsirolimus, AP-23573 (ridaforolimus) , biolimus and AP21967. Additional rapamycin analogs suitable for use with FKBP/FRB-based dimerization switches are further described in the section entitled “Combination Therapies” , or in the subsection entitled “Exemplary mTOR inhibitors” .
- the present invention also includes a CAR encoding RNA construct that can be directly transfected into a cell.
- a method for generating mRNA for use in transfection can involve in vitro transcription (IVT) of a template with specially designed primers, followed by polyA addition, to produce a construct containing 3' and 5' untranslated sequence ( “UTR” ) , a 5' cap and/or Internal Ribosome Entry Site (IRES) , the nucleic acid to be expressed, and a polyA tail, typically 50-2000 bases in length (SEQ ID NO: 35) .
- RNA so produced can efficiently transfect different kinds of cells.
- the template includes sequences for the CAR.
- the mesothelin CAR is encoded by a messenger RNA (mRNA) .
- mRNA messenger RNA
- the mRNA encoding the mesothelin CAR is introduced into a T cell for production of a CART cell.
- the in vitro transcribed RNA CAR can be introduced to a cell as a form of transient transfection.
- the RNA is produced by in vitro transcription using a polymerase chain reaction (PCR) -generated template.
- DNA of interest from any source can be directly converted by PCR into a template for in vitro mRNA synthesis using appropriate primers and RNA polymerase.
- the source of the DNA can be, for example, genomic DNA, plasmid DNA, phage DNA, cDNA, synthetic DNA sequence or any other appropriate source of DNA.
- the desired temple for in vitro transcription is a CAR of the present invention.
- the template for the RNA CAR comprises an extracellular region comprising a single chain variable domain of an anti-tumor antibody; a hinge region, a transmembrane domain (e.g., a transmembrane domain of CD8a) ; and a cytoplasmic region that includes an intracellular signaling domain, e.g., comprising the signaling domain of CD3-zeta and the signaling domain of 4-1BB.
- the DNA to be used for PCR contains an open reading frame.
- the DNA can be from a naturally occurring DNA sequence from the genome of an organism.
- the nucleic acid can include some or all of the 5' a nd/or 3' untranslated regions (UTRs) .
- the nucleic acid can include exons and introns.
- the DNA to be used for PCR is a human nucleic acid sequence.
- the DNA to be used for PCR is a human nucleic acid sequence including the 5' a nd 3' UTRs.
- the DNA can alternatively be an artificial DNA sequence that is not normally expressed in a naturally occurring organism.
- An exemplary artificial DNA sequence is one that contains portions of genes that are ligated together to form an open reading frame that encodes a fusion protein. The portions of DNA that are ligated together can be from a single organism or from more than one organism.
- PCR is used to generate a template for in vitro transcription of mRNA which is used for transfection.
- Methods for performing PCR are well known in the art.
- Primers for use in PCR are designed to have regions that are substantially complementary to regions of the DNA to be used as a template for the PCR.
- the term “substantially complementary” refers to sequences of nucleotides where a majority or all of the bases in the primer sequence are complementary, or one or more bases are non-complementary, or mismatched. Substantially complementary sequences are able to anneal or hybridize with the intended DNA target under annealing conditions used for PCR.
- the primers can be designed to be substantially complementary to any portion of the DNA template.
- the primers can be designed to amplify the portion of a nucleic acid that is normally transcribed in cells (the open reading frame) , including 5'a nd 3' UTRs.
- the primers can also be designed to amplify a portion of a nucleic acid that encodes a particular domain of interest.
- the primers are designed to amplify the coding region of a human cDNA, including all or portions of the 5' a nd 3' UTRs. Primers useful for PCR can be generated by synthetic methods that are well known in the art.
- Forward primers are primers that contain a region of nucleotides that are substantially complementary to nucleotides on the DNA template that are upstream of the DNA sequence that is to be amplified.
- upstream refers to a location 5’ to the DNA sequence to be amplified relative to the coding strand.
- reverse primers are primers that contain a region of nucleotides that are substantially complementary to a double-stranded DNA template that are downstream of the DNA sequence that is to be amplified.
- downstream refers to a location 3' to the DNA sequence to be amplified relative to the coding strand.
- DNA polymerase useful for PCR can be used in the methods disclosed herein.
- the reagents and polymerase are commercially available from a number of sources.
- the RNA preferably has 5' a nd 3' UTRs.
- the 5' UTR is between one and 3000 nucleotides in length.
- the length of 5' a nd 3' UTR sequences to be added to the coding region can be altered by different methods, including, but not limited to, designing primers for PCR that anneal to different regions of the UTRs. Using this approach, one of ordinary skill in the art can modify the 5' a nd 3' UTR lengths required to achieve optimal translation efficiency following transfection of the transcribed RNA.
- the 5' a nd 3' UTRs can be the naturally occurring, endogenous 5' a nd 3' UTRs for the nucleic acid of interest.
- UTR sequences that are not endogenous to the nucleic acid of interest can be added by incorporating the UTR sequences into the forward and reverse primers or by any other modifications of the template.
- the use of UTR sequences that are not endogenous to the nucleic acid of interest can be useful for modifying the stability and/or translation efficiency of the RNA. For example, it is known that AU-rich elements in 3' UTR sequences can decrease the stability of mRNA. Therefore, 3' UTRs can be selected or designed to increase the stability of the transcribed RNA based on properties of UTRs that are well known in the art.
- the 5' UTR can contain the Kozak sequence of the endogenous nucleic acid.
- a consensus Kozak sequence can be redesigned by adding the 5' UTR sequence.
- Kozak sequences can increase the efficiency of translation of some RNA transcripts, but does not appear to be required for all RNAs to enable efficient translation. The requirement for Kozak sequences for many mRNAs is known in the art.
- the 5' UTR can be 5’ UTR of an RNA virus whose RNA genome is stable in cells.
- various nucleotide analogues can be used in the 3' or 5' UTR to impede exonuclease degradation of the mRNA.
- a promoter of transcription should be attached to the DNA template upstream of the sequence to be transcribed.
- the RNA polymerase promoter becomes incorporated into the PCR product upstream of the open reading frame that is to be transcribed.
- the promoter is a T7 polymerase promoter, as described elsewhere herein.
- Other useful promoters include, but are not limited to, T3 and SP6 RNA polymerase promoters. Consensus nucleotide sequences for T7, T3 and SP6 promoters are known in the art.
- the mRNA has both a cap on the 5' end and a 3' poly (A) tail which determine ribosome binding, initiation of translation and stability mRNA in the cell.
- a 3' poly (A) tail which determine ribosome binding, initiation of translation and stability mRNA in the cell.
- RNA polymerase produces a long concatameric product which is not suitable for expression in eukaryotic cells.
- the transcription of plasmid DNA linearized at the end of the 3' UTR results in normal sized mRNA which is not effective in eukaryotic transfection even if it is polyadenylated after transcription.
- phage T7 RNA polymerase can extend the 3' end of the transcript beyond the last base of the template (Schenborn and Mierendorf, Nuc Acids Res., 13: 6223-36 (1985) ; Nacheva and Berzal-Herranz, Eur. J. Biochem., 270: 1485-65 (2003) .
- the polyA/T segment of the transcriptional DNA template can be produced during PCR by using a reverse primer containing a polyT tail, such as 100T tail (SEQ ID NO: 31) (size can be 50-5000 T (SEQ ID NO: 32) ) , or after PCR by any other method, including, but not limited to, DNA ligation or in vitro recombination.
- Poly (A) tails also provide stability to RNAs and reduce their degradation. Generally, the length of a poly (A) tail positively correlates with the stability of the transcribed RNA. In one embodiment, the poly (A) tail is between 100 and 5000 adenosines (SEQ ID NO: 33) .
- Poly (A) tails of RNAs can be further extended following in vitro transcription with the use of a poly (A) polymerase, such as E. coli polyA polymerase (E-PAP) .
- E-PAP E. coli polyA polymerase
- increasing the length of a poly (A) tail from 100 nucleotides to between 300 and 400 nucleotides (SEQ ID NO: 34) results in about a two-fold increase in the translation efficiency of the RNA.
- the attachment of different chemical groups to the 3' end can increase mRNA stability. Such attachment can contain modified/artificial nucleotides, aptamers and other compounds.
- ATP analogs can be incorporated into the poly (A) tail using poly (A) polymerase. ATP analogs can further increase the stability of the RNA.
- RNAs produced by the methods disclosed herein include a 5' cap.
- the 5' cap is provided using techniques known in the art and described herein (Cougot, et al., Trends in Biochem. Sci., 29: 436-444 (2001) ; Stepinski, et al., RNA, 7: 1468-95 (2001) ; Elango, et al., Biochim. Biophys. Res. Commun., 330: 958-966 (2005)) .
- RNAs produced by the methods disclosed herein can also contain an internal ribosome entry site (IRES) sequence.
- IRES sequence may be any viral, chromosomal or artificially designed sequence which initiates cap-independent ribosome binding to mRNA and facilitates the initiation of translation. Any solutes suitable for cell electroporation, which can contain factors facilitating cellular permeability and viability such as sugars, peptides, lipids, proteins, antioxidants, and surfactants can be included.
- RNA can be introduced into target cells using any of a number of different methods, for instance, commercially available methods which include, but are not limited to, electroporation (Amaxa Nucleofector-II (Amaxa Biosystems, Cologne, Germany) ) , (ECM 830 (BTX) (Harvard Instruments, Boston, Mass. ) or the Gene Pulser II (BioRad, Denver, Colo. ) , Multiporator (Eppendort, Hamburg Germany) , cationic liposome mediated transfection using lipofection, polymer encapsulation, peptide mediated transfection, or biolistic particle delivery systems such as “gene guns” (see, for example, Nishikawa, et al. Hum Gene Ther., 12 (8) : 861-70 (2001) .
- electroporation Amaxa Nucleofector-II (Amaxa Biosystems, Cologne, Germany)
- ECM 830 BTX
- Gene Pulser II Bio
- the present invention provides CAR transgenes comprising nucleic acid sequences encoding one or more CAR constructs of the invention.
- the CAR transgene is provided as a messenger RNA transcript.
- the CAR transgene is provided as a DNA construct.
- the invention pertains to an isolated nucleic acid molecule encoding a chimeric antigen receptor (CAR) , wherein the CAR comprises an anti-mesothelin binding domain (e.g., a human anti-mesothelin binding domain) , a transmembrane domain, and an intracellular signaling domain comprising a stimulatory domain.
- the anti-mesothelin binding domain is an anti-mesothelin binding domain described herein, e.g., an anti-mesothelin binding domain which comprises a sequence selected from a group consisting of SEQ ID NO: 87-111, or a sequence with 95-99% identify thereof.
- the isolated nucleic acid molecule further comprises a sequence encoding a costimulatory domain.
- the transmembrane domain is a transmembrane domain of a protein selected from the group consisting of the alpha, beta or zeta chain of the T-cell receptor, CD28, CD3 epsilon, CD45, CD4, CD5, CD8, CD9, CD16, CD22, CD33, CD37, CD64, CD80, CD86, CD134, CD137 and CD154.
- the transmembrane domain comprises a sequence of SEQ ID NO: 6, or a sequence with 95-99% identity thereof.
- the anti-mesothelin binding domain is connected to the transmembrane domain by a hinge region, e.g., a hinge described herein.
- the hinge region comprises SEQ ID NO: 2 or SEQ ID NO: 3 or SEQ ID NO: 4 or SEQ ID NO: 5, or a sequence with 95-99% identity thereof.
- the isolated nucleic acid molecule further comprises a sequence encoding a costimulatory domain.
- the costimulatory domain is a functional signaling domain of a protein selected from the group consisting of OX40, CD27, CD28, CDS, ICAM-1, LFA-1 (CD11a/CD18) , ICOS (CD278) , and 4-1BB (CD137) .
- costimulatory molecules include CDS, ICAM-1, GITR, BAFFR, HVEM (LIGHTR) , SLAMF7, NKp80 (KLRF1) , NKp44, NKp30, NKp46, CD160, CD19, CD4, CD8alpha, CD8beta, IL2R beta, IL2R gamma, IL7R alpha, ITGA4, VLA1, CD49a, ITGA4, IA4, CD49D, ITGA6, VLA-6, CD49f, ITGAD, CD11d, ITGAE, CD103, ITGAL, CD11a, LFA-1, ITGAM, CD11b, ITGAX, CD11c, ITGB1, CD29, ITGB2, CD18, LFA-1, ITGB7, NKG2D, NKG2C, TNFR2, TRANCE/RANKL, DNAM1 (CD226) , SLAMF4 (CD244, 2B4) , CD84, CD96 (Tactile)
- the costimulatory domain comprises a sequence of SEQ ID NO: 7, or a sequence with 95-99% identity thereof.
- the intracellular signaling domain comprises a functional signaling domain of 4-1BB and a functional signaling domain of CD3 zeta.
- the intracellular signaling domain comprises the sequence of SEQ ID NO: 7 or SEQ ID NO: 8, or a sequence with 95-99% identity thereof, and the sequence of SEQ ID NO: 9 or SEQ ID NO: 10, or a sequence with 95-99% identity thereof, wherein the sequences comprising the intracellular signaling domain are expressed in the same frame and as a single polypeptide chain.
- the invention pertains to an isolated nucleic acid molecule encoding a CAR construct comprising a leader sequence of SEQ ID NO: 1, a scFv domain having a sequence selected from the group consisting of SEQ ID NO: 39; SEQ ID NO: 40, SEQ ID NO: 41, SEQ ID NO: 42, SEQ ID NO: 43, SEQ ID NO: 44, SEQ ID NO: 45, SEQ ID NO: 46, SEQ ID NO: 47, SEQ ID NO:48, SEQ ID NO: 49, SEQ ID NO: 50, SEQ ID NO: 51, SEQ ID NO: 52, SEQ ID NO: 53, SEQ ID NO: 54, SEQ ID NO: 55, SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO:59, SEQ ID NO: 60, SEQ ID NO: 61, and SEQ ID NO: 62, (or a sequence with 95-99% identify thereof) , a hinge region of SEQ ID NO: 2
- the invention pertains to an isolated polypeptide molecule encoded by the nucleic acid molecule.
- the isolated polypeptide molecule comprises a sequence selected from the group consisting of SEQ ID NO: 63; SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO: 67, SEQ ID NO: 68, SEQ ID NO: 69, SEQ ID NO: 70, SEQ ID NO: 71, SEQ ID NO: 72, SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, SEQ ID NO: 79, SEQ ID NO: 80, SEQ ID NO: 81, SEQ ID NO: 82, SEQ ID NO: 83, SEQ ID NO: 84, SEQ ID NO: 85, and SEQ ID NO: 86, or a sequence with 95-99% identity thereof.
- the invention pertains to an isolated nucleic acid molecule encoding a chimeric antigen receptor (CAR) molecule that comprises an anti-mesothelin binding domain, a transmembrane domain, and an intracellular signaling domain comprising a stimulatory domain, and wherein the nucleic acid encoding the anti-mesothelin binding domain comprises a sequence selected from the group consisting of SEQ ID NO: 111; SEQ ID NO: 112, SEQ ID NO: 113, SEQ ID NO: 114, SEQ ID NO: 115, SEQ ID NO: 116, SEQ ID NO: 117, SEQ ID NO: 118, SEQ ID NO: 119, SEQ ID NO: 120, SEQ ID NO: 121, SEQ ID NO: 122, SEQ ID NO: 123, SEQ ID NO:124, SEQ ID NO: 125, SEQ ID NO: 126, SEQ ID NO: 127, SEQ ID NO: 128, SEQ ID NO: 129, SEQ ID NO: 111
- the encoded CAR molecule further comprises a sequence encoding a costimulatory domain.
- the costimulatory domain is a functional signaling domain of a protein selected from the group consisting of OX40, CD27, CD28, CDS, ICAM-1, LFA-1 (CD11a/CD18) and 4-1BB (CD137) .
- the costimulatory domain comprises a sequence of SEQ ID NO: 7.
- the transmembrane domain is a transmembrane domain of a protein selected from the group consisting of the alpha, beta or zeta chain of the T-cell receptor, CD28, CD3 epsilon, CD45, CD4, CD5, CD8, CD9, CD16, CD22, CD33, CD37, CD64, CD80, CD86, CD134, CD137 and CD154.
- the transmembrane domain comprises a sequence of SEQ ID NO: 6.
- the intracellular signaling domain comprises a functional signaling domain of 4-1BB and a functional signaling domain of zeta.
- the intracellular signaling domain comprises the sequence of SEQ ID NO: 7 and the sequence of SEQ ID NO: 9, wherein the sequences comprising the intracellular signaling domain are expressed in the same frame and as a single polypeptide chain.
- the anti-mesothelin binding domain is connected to the transmembrane domain by a hinge region.
- the hinge region comprises SEQ ID NO: 2.
- the hinge region comprises SEQ ID NO: 3, SEQ ID NO: 4, or SEQ ID NO: 5.
- the invention pertains to an isolated CAR molecule comprising a leader sequence of SEQ ID NO: 1, a scFv domain having a sequence selected from the group consisting of SEQ ID NOS: 39-62, or a sequence with 95-99% identify thereof, a hinge region of SEQ ID NO: 2 or SEQ ID NO: 3 or SEQ ID NO: 4 or SEQ ID NO: 5, a transmembrane domain having a sequence of SEQ ID NO: 6, a 4-1BB costimulatory domain having a sequence of SEQ ID NO: 7 or a CD27 costimulatory domain having a sequence of SEQ ID NO: 8, and a CD3 zeta stimulatory domain having a sequence of SEQ ID NO: 9 or SEQ ID NO: 10.
- the encoded CAR molecule comprises a sequence selected from the group consisting of SEQ ID NOS: 63-86, or a sequence with 95-99% identify thereof.
- the present invention further provides vectors comprising CAR transgenes.
- a CAR vectors can be directly transduced into a cell, e.g., a T cell or NK cell.
- the vector is a cloning or expression vector, e.g., a vector including, but not limited to, one or more plasmids (e.g., expression plasmids, cloning vectors, minicircles, minivectors, double minute chromosomes) , retroviral and lentiviral vector constructs.
- the vector is capable of expressing the CAR construct in mammalian T cells or NK cells.
- the mammalian T cell is a human T cell or a human NK cell.
- the present invention also includes a CAR encoding RNA construct that can be directly transfected into a cell, e.g., a T cell or a NK cell.
- a method for generating mRNA for use in transfection involves in vitro transcription (IVT) of a template with specially designed primers, followed by polyA addition, to produce a construct containing 3' a nd 5' untranslated sequence (“UTR” ) , a 5' cap and/or Internal Ribosome Entry Site (IRES) , the gene to be expressed, and a polyA tail, typically 50-2000 bases in length.
- RNA so produced can efficiently transfect different kinds of cells.
- the template includes sequences for the CAR.
- the mesothelin CAR transgene is encoded by a messenger RNA (mRNA) .
- mRNA messenger RNA
- the mRNA encoding the mesothelin CAR transgene is introduced into a T cell for production of a CART cell, or a NK cell.
- the present invention also provides vectors in which a DNA of the present invention is inserted.
- Vectors derived from retroviruses such as the lentivirus are suitable tools to achieve long-term gene transfer since they allow long-term, stable integration of a transgene and its propagation in daughter cells.
- Lentiviral vectors have the added advantage over vectors derived from onco-retroviruses such as murine leukemia viruses in that they can transduce non-proliferating cells, such as hepatocytes. They also have the added advantage of low immunogenicity.
- the vector comprising the nucleic acid encoding the desired CAR of the invention is a DNA, a RNA, a plasmid, an adenoviral vector, a lentivirus vector, or a retrovirus vector.
- the vector comprising the nucleic acid encoding the desired CAR of the invention is an adenoviral vector (A5/35) .
- the expression of nucleic acids encoding CARs can be accomplished using of transposons such as sleeping beauty, CRISPR, CAS9, and zinc finger nucleases. See, e.g., June et al. 2009 Nature Reviews Immunology 9.10: 704-716, incorporated herein by reference in its entirety.
- the expression of natural or synthetic nucleic acids encoding CARs is typically achieved by operably linking a nucleic acid encoding the CAR polypeptide or portions thereof to a promoter, and incorporating the construct into an expression vector.
- the vectors can be suitable for replication and integration eukaryotes.
- Typical cloning vectors contain transcription and translation terminators, initiation sequences, and promoters useful for regulation of the expression of the desired nucleic acid sequence.
- the expression constructs of the present invention may also be used for nucleic acid immunization and gene therapy, using standard gene delivery protocols. Methods for gene delivery are known in the art. See, e.g., U.S. Pat. Nos. 5,399,346, 5,580,859, 5,589,466, incorporated by reference herein in their entireties.
- the invention provides a gene therapy vector.
- the nucleic acid can be cloned into a number of types of vectors.
- the nucleic acid can be cloned into a vector including, but not limited to a plasmid, a phagemid, a phage derivative, an animal virus, and a cosmid.
- Vectors of particular interest include expression vectors, replication vectors, probe generation vectors, and sequencing vectors.
- the expression vector may be provided to a cell in the form of a viral vector.
- Viral vector technology is well known in the art and is described, for example, in Sambrook et al., 2012, MOLECULAR CLONING: A LABORATORY MANUAL, volumes 1 -4, Cold Spring Harbor Press, NY) , and in other virology and molecular biology manuals.
- Viruses, which are useful as vectors include, but are not limited to, retroviruses, adenoviruses, adeno-associated viruses, herpes viruses, and lentiviruses.
- a suitable vector contains an origin of replication functional in at least one organism, a promoter sequence, convenient restriction endonuclease sites, and one or more selectable markers, (e.g., WO 01/96584; WO 01/29058; and U.S. Pat. No. 6,326,193) .
- retroviruses provide a convenient platform for gene delivery systems.
- a selected gene can be inserted into a vector and packaged in retroviral particles using techniques known in the art.
- the recombinant virus can then be isolated and delivered to cells of the subject either in vivo or ex vivo.
- retroviral systems are known in the art.
- adenovirus vectors are used.
- a number of adenovirus vectors are known in the art.
- lentivirus vectors are used.
- promoter elements regulate the frequency of transcriptional initiation.
- these are located in the region 30-110 bp upstream of the start site, although a number of promoters have been shown to contain functional elements downstream of the start site as well.
- the spacing between promoter elements frequently is flexible, so that promoter function is preserved when elements are inverted or moved relative to one another.
- tk thymidine kinase
- the spacing between promoter elements can be increased to 50 bp apart before activity begins to decline.
- individual elements can function either cooperatively or independently to activate transcription.
- Exemplary promoters include the CMV IE gene, EF-1 ⁇ , ubiquitin C, or phosphoglycerokinase (PGK) promoters.
- EF1alpha promoter EF1alpha promoter
- the native EF1a promoter drives expression of the alpha subunit of the elongation factor-1 complex, which is responsible for the enzymatic delivery of aminoacyl tRNAs to the ribosome.
- the EF1a promoter has been extensively used in mammalian expression plasmids and has been shown to be effective in driving CAR expression from transgenes cloned into a lentiviral vector. See, e.g., Milone et al., Mol. Ther. 17 (8) : 1453–1464 (2009) .
- the EF1a promoter comprises the sequence provided as SEQ ID NO: 11.
- CMV immediate early cytomegalovirus
- This promoter sequence is a strong constitutive promoter sequence capable of driving high levels of expression of any polynucleotide sequence operatively linked thereto.
- other constitutive promoter sequences may also be used, including, but not limited to the simian virus 40 (SV40) early promoter, mouse mammary tumor virus (MMTV) , human immunodeficiency virus (HIV) long terminal repeat (LTR) promoter, MoMuLV promoter, an avian leukemia virus promoter, an Epstein-Barr virus immediate early promoter, a Rous sarcoma virus promoter, as well as human gene promoters such as, but not limited to, the actin promoter, the myosin promoter, the elongation factor-1 ⁇ promoter, the hemoglobin promoter, and the creatine kinase promoter.
- SV40 simian virus 40
- MMTV mouse mammary tumor virus
- HSV human immunodeficiency virus
- inducible promoters are also contemplated as part of the invention.
- the use of an inducible promoter provides a molecular switch capable of turning on expression of the polynucleotide sequence which it is operatively linked when such expression is desired, or turning off the expression when expression is not desired.
- inducible promoters include, but are not limited to a metallothionine promoter, a glucocorticoid promoter, a progesterone promoter, and a tetracycline promoter.
- the expression vector to be introduced into a cell can also contain either a selectable marker gene or a reporter gene or both to facilitate identification and selection of expressing cells from the population of cells sought to be transfected or infected through viral vectors.
- the selectable marker may be carried on a separate piece of DNA and used in a co-transfection procedure. Both selectable markers and reporter genes may be flanked with appropriate regulatory sequences to enable expression in the host cells.
- Useful selectable markers include, for example, antibiotic-resistance genes, such as neo and the like.
- Reporter genes are used for identifying potentially transfected cells and for evaluating the functionality of regulatory sequences.
- a reporter gene is a gene that is not present in or expressed by the recipient organism or tissue and that encodes a polypeptide whose expression is manifested by some easily detectable property, e.g., enzymatic activity. Expression of the reporter gene is assayed at a suitable time after the DNA has been introduced into the recipient cells.
- Suitable reporter genes may include genes encoding luciferase, beta-galactosidase, chloramphenicol acetyl transferase, secreted alkaline phosphatase, or the green fluorescent protein gene (e.g., Ui-Tei et al., 2000 FEBS Letters 479: 79-82) .
- Suitable expression systems are well known and may be prepared using known techniques or obtained commercially. In general, the construct with the minimal 5' flanking region showing the highest level of expression of reporter gene is identified as the promoter. Such promoter regions may be linked to a reporter gene and used to evaluate agents for the ability to modulate promoter-driven transcription.
- the vector can further comprise a nucleic acid encoding a second CAR.
- the second CAR includes an antigen binding domain to, e.g., a target other than mesothelin on stroma cells, e.g., FAP; a target other than mesothelin on prostate cancer cells, e.g., androgen receptor, OR51E2, PSMA, PSCA, PDGRF- ⁇ , TARP, GloboH, MAD-CT-1, or MAD-CT-2; a target other than mesothelin on ovararian cancer cells, e.g., Tn, PRSS21, CD171, Lewis Y, folate receptor ⁇ , claudin6, GloboH, or sperm protein 17; e.g., a target other than mesothelin on lung cancer cells, e.g., VEGF, HER3, IGF-1R, EGFR, DLL4, or Trop-2.
- the vector comprises a nucleic acid sequence encoding a first CAR that targets a first antigen and includes an intracellular signaling domain having a costimulatory signaling domain but not a primary signaling domain, and a nucleic acid encoding a second CAR that targets a second, different, antigen and includes an intracellular signaling domain having a primary signaling domain but not a costimulatory signaling domain.
- the vector comprises a nucleic acid encoding a first mesothelin CAR that includes a mesothelin binding domain, a transmembrane domain and a costimulatory domain and a nucleic acid encoding a second CAR that targets an antigen other than mesothelin (e.g., a target other than mesothelin on stroma cells, e.g., FAP; a target other than mesothelin on prostate cancer cells, e.g., androgen receptor, OR51E2, PSMA, PSCA, PDGRF- ⁇ , TARP, GloboH, MAD-CT-1, or MAD-CT-2; a target other than mesothelin on ovararian cancer cells, e.g., Tn, PRSS21, CD171, Lewis Y, folate receptor ⁇ , claudin6, GloboH, or sperm protein 17; e.g., a target other than mesothe
- the vector comprises a nucleic acid encoding a first mesothelin CAR that includes a mesothelin binding domain, a transmembrane domain and a primary signaling domain and a nucleic acid encoding a second CAR that targets an antigen other than mesothelin (e.g., a target other than mesothelin on stroma cells, e.g., FAP; a target other than mesothelin on prostate cancer cells, e.g., androgen receptor, OR51E2, PSMA, PSCA, PDGRF- ⁇ , TARP, GloboH, MAD-CT-1, or MAD-CT-2; a target other than mesothelin on ovararian cancer cells, e.g., Tn, PRSS21, CD171, Lewis Y, folate receptor ⁇ , claudin6, GloboH, or sperm protein 17; e.g., a target other than mesothel
- the vector comprises a nucleic acid encoding a mesothelin CAR described herein and a nucleic acid encoding an inhibitory CAR.
- the inhibitory CAR comprises an antigen binding domain that binds an antigen found on normal cells but not cancer cells, e.g., normal cells that also express CLL.
- the inhibitory CAR comprises the antigen binding domain, a transmembrane domain and an intracellular domain of an inhibitory molecule.
- the intracellular domain of the inhibitory CAR can be an intracellular domain of PD1, PD-L1, CTLA4, TIM3, CEACAM (e.g., CEACAM-1, CEACAM-3 and/or CEACAM-5) , LAG3, VISTA, BTLA, TIGIT, LAIR1, CD160, 2B4 and TGFR beta.
- CEACAM e.g., CEACAM-1, CEACAM-3 and/or CEACAM-5
- LAG3, VISTA BTLA
- TIGIT LAIR1, CD160, 2B4 and TGFR beta.
- the vector comprises a nucleic acid encoding a mesothelin CAR described herein and an inhibitory nucleic acid, e.g., a dsRNA, e.g., an siRNA or shRNA, e.g., as described herein.
- an inhibitory nucleic acid e.g., a dsRNA, e.g., an siRNA or shRNA, e.g., as described herein.
- the vector can be readily introduced into a host cell, e.g., mammalian, bacterial, yeast, or insect cell by any method in the art.
- the expression vector can be transferred into a host cell by physical, chemical, or biological means.
- Physical methods for introducing a polynucleotide into a host cell include calcium phosphate precipitation, lipofection, particle bombardment, microinjection, electroporation, and the like. Methods for producing cells comprising vectors and/or exogenous nucleic acids are well-known in the art. See, for example, Sambrook et al., 2012, MOLECULAR CLONING: A LABORATORY MANUAL, volumes 1 -4, Cold Spring Harbor Press, NY) .
- a preferred method for the introduction of a polynucleotide into a host cell is lipofection, e.g., using Lipofectamine (Life Technologies) .
- Biological methods for introducing a polynucleotide of interest into a host cell include the use of DNA and RNA vectors.
- Viral vectors, and especially retroviral vectors have become the most widely used method for inserting genes into mammalian, e.g., human cells.
- Other viral vectors can be derived from lentivirus, poxviruses, herpes simplex virus I, adenoviruses and adeno-associated viruses, and the like. See, for example, U.S. Pat. Nos. 5,350,674 and 5,585,362.
- Chemical means for introducing a polynucleotide into a host cell include colloidal dispersion systems, such as macromolecule complexes, nanocapsules, microspheres, beads, and lipid-based systems including oil-in-water emulsions, micelles, mixed micelles, and liposomes.
- An exemplary colloidal system for use as a delivery vehicle in vitro and in vivo is a liposome (e.g., an artificial membrane vesicle) .
- Other methods of state-of-the-art targeted delivery of nucleic acids are available, such as delivery of polynucleotides with targeted nanoparticles or other suitable sub-micron sized delivery system.
- an exemplary delivery vehicle is a liposome.
- lipid formulations is contemplated for the introduction of the nucleic acids into a host cell (in vitro, ex vivo or in vivo) .
- the nucleic acid may be associated with a lipid.
- the nucleic acid associated with a lipid may be encapsulated in the aqueous interior of a liposome, interspersed within the lipid bilayer of a liposome, attached to a liposome via a linking molecule that is associated with both the liposome and the oligonucleotide, entrapped in a liposome, complexed with a liposome, dispersed in a solution containing a lipid, mixed with a lipid, combined with a lipid, contained as a suspension in a lipid, contained or complexed with a micelle, or otherwise associated with a lipid.
- Lipid, lipid/DNA or lipid/expression vector associated compositions are not limited to any particular structure in solution.
- Lipids are fatty substances which may be naturally occurring or synthetic lipids.
- lipids include the fatty droplets that naturally occur in the cytoplasm as well as the class of compounds which contain long-chain aliphatic hydrocarbons and their derivatives, such as fatty acids, alcohols, amines, amino alcohols, and aldehydes.
- Lipids suitable for use can be obtained from commercial sources.
- dimyristyl phosphatidylcholine “DMPC”
- DCP dicetyl phosphate
- Choi cholesterol
- DMPG dimyristyl phosphatidylglycerol
- Stock solutions of lipids in chloroform or chloroform/methanol can be stored at about -20°C.
- Liposome is a generic term encompassing a variety of single and multilamellar lipid vehicles formed by the generation of enclosed lipid bilayers or aggregates. Liposomes can be characterized as having vesicular structures with a phospholipid bilayer membrane and an inner aqueous medium. Multilamellar liposomes have multiple lipid layers separated by aqueous medium. They form spontaneously when phospholipids are suspended in an excess of aqueous solution.
- compositions that have different structures in solution than the normal vesicular structure are also encompassed.
- the lipids may assume a micellar structure or merely exist as nonuniform aggregates of lipid molecules.
- lipofectamine-nucleic acid complexes are also contemplated.
- assays include, for example, “molecular biological” assays well known to those of skill in the art, such as Southern and Northern blotting, RT-PCR and PCR; “biochemical” assays, such as detecting the presence or absence of a particular peptide, e.g., by immunological means (ELISAs and Western blots) or by assays described herein to identify agents falling within the scope of the invention.
- molecular biological assays well known to those of skill in the art, such as Southern and Northern blotting, RT-PCR and PCR
- biochemical assays such as detecting the presence or absence of a particular peptide, e.g., by immunological means (ELISAs and Western blots) or by assays described herein to identify agents falling within the scope of the invention.
- the present invention further provides a vector comprising a CAR encoding nucleic acid molecule.
- a CAR vector can be directly transduced into a cell, e.g., a T cell or a NK cell.
- the vector is a cloning or expression vector, e.g., a vector including, but not limited to, one or more plasmids (e.g., expression plasmids, cloning vectors, minicircles, minivectors, double minute chromosomes) , retroviral and lentiviral vector constructs.
- the vector is capable of expressing the CAR construct in mammalian T cells.
- the mammalian T cell is a human T cell.
- the mammalian cell is a human NK cell.
- a source of cells e.g., T cells or NK cells
- T cells e.g., T cells or NK cells
- subject is intended to include living organisms in which an immune response can be elicited (e.g., mammals) . Examples of subjects include humans, dogs, cats, mice, rats, and transgenic species thereof.
- T cells can be obtained from a number of sources, including peripheral blood mononuclear cells, bone marrow, lymph node tissue, cord blood, thymus tissue, tissue from a site of infection, ascites, pleural effusion, spleen tissue, and tumors. In certain aspects of the present invention, any number of T cell lines available in the art, may be used.
- T cells can be obtained from a unit of blood collected from a subject using any number of techniques known to the skilled artisan, such as Ficoll TM separation.
- cells from the circulating blood of an individual are obtained by apheresis.
- the apheresis product typically contains lymphocytes, including T cells, monocytes, granulocytes, B cells, other nucleated white blood cells, red blood cells, and platelets.
- the cells collected by apheresis may be washed to remove the plasma fraction and to place the cells in an appropriate buffer or media for subsequent processing steps.
- the cells are washed with phosphate buffered saline (PBS) .
- PBS phosphate buffered saline
- the wash solution lacks calcium and may lack magnesium or may lack many if not all divalent cations. Initial activation steps in the absence of calcium can lead to magnified activation.
- a washing step may be accomplished by methods known to those in the art, such as by using a semi-automated “flow-through” centrifuge (for example, the Cobe 2991 cell processor, the Baxter CytoMate, or the Haemonetics Cell Saver 5) according to the manufacturer’s instructions.
- the cells may be resuspended in a variety of biocompatible buffers, such as, for example, Ca-free, Mg-free PBS, PlasmaLyte A, or other saline solution with or without buffer.
- the undesirable components of the apheresis sample may be removed and the cells directly resuspended in culture media.
- T cells are isolated from peripheral blood lymphocytes by lysing the red blood cells and depleting the monocytes, for example, by centrifugation through a PERCOLLTM gradient or by counterflow centrifugal elutriation.
- a specific subpopulation of T cells such as CD3+, CD28+, CD4+, CD8+, CD45RA+, and CD45RO+T cells, can be further isolated by positive or negative selection techniques.
- T cells are isolated by incubation with anti-CD3/anti-CD28 (e.g., 3x28) -conjugated beads, such as M-450 CD3/CD28 T, for a time period sufficient for positive selection of the desired T cells.
- the time period is about 30 minutes. In a further aspect, the time period ranges from 30 minutes to 36 hours or longer and all integer values there between. In a further aspect, the time period is at least 1, 2, 3, 4, 5, or 6 hours. In yet another preferred aspect, the time period is 10 to 24 hours. In one aspect, the incubation time period is 24 hours. For isolation of T cells from patients with leukemia, use of longer incubation times, such as 24 hours, can increase cell yield. Longer incubation times may be used to isolate T cells in any situation where there are few T cells as compared to other cell types, such in isolating tumor infiltrating lymphocytes (TIL) from tumor tissue or from immunocompromised individuals.
- TIL tumor infiltrating lymphocytes
- T cells can be preferentially selected for or against at culture initiation or at other time points during the process.
- subpopulations of T cells can be preferentially selected for or against at culture initiation or at other desired time points.
- multiple rounds of selection can also be used in the context of this invention. In certain aspects, it may be desirable to perform the selection procedure and use the “unselected” cells in the activation and expansion process. “Unselected” cells can also be subjected to further rounds of selection.
- Enrichment of a T cell population by negative selection can be accomplished with a combination of antibodies directed to surface markers unique to the negatively selected cells.
- One method is cell sorting and/or selection via negative magnetic immunoadherence or flow cytometry that uses a cocktail of monoclonal antibodies directed to cell surface markers present on the cells negatively selected.
- a monoclonal antibody cocktail typically includes antibodies to CD14, CD20, CD11b, CD16, HLA-DR, and CD8.
- T regulatory cells are depleted by anti-C25 conjugated beads or other similar method of selection.
- a T cell population can be selected that expresses one or more of IFN- ⁇ , TNF ⁇ , IL-17A, IL-2, IL-3, IL-4, GM-CSF, IL-10, IL-13, granzyme B, and perforin, or other appropriate molecules, e.g., other cytokines.
- Methods for screening for cell expression can be determined, e.g., by the methods described in PCT Publication No. : WO 2013/126712.
- a T cell population is diaglycerol kinase (DGK) -deficient.
- DGK-deficient cells include cells that do not express DGK RNA or protein, or have reduced or inhibited DGK activity.
- DGK-deficient cells can be generated by genetic approaches, e.g., administering RNA-interfering agents, e.g., siRNA, shRNA, miRNA, to reduce or prevent DGK expression.
- RNA-interfering agents e.g., siRNA, shRNA, miRNA
- DGK-deficient cells can be generated by treatment with DGK inhibitors described herein.
- a T cell population is Ikaros-deficient.
- Ikaros-deficient cells include cells that do not express Ikaros RNA or protein, or have reduced or inhibited Ikaros activity, Ikaros-deficient cells can be generated by genetic approaches, e.g., administering RNA-interfering agents, e.g., siRNA, shRNA, miRNA, to reduce or prevent Ikaros expression.
- RNA-interfering agents e.g., siRNA, shRNA, miRNA
- Ikaros-deficient cells can be generated by treatment with Ikaros inhibitors, e.g., lenalidomide.
- a T cell population is DGK-deficient and Ikaros-deficient, e.g., does not express DGK and Ikaros, or has reduced or inhibited DGK and Ikaros activity.
- DGK and Ikaros-deficient cells can be generated by any of the methods described herein.
- the concentration of cells and surface can be varied.
- it may be desirable to significantly decrease the volume in which beads and cells are mixed together e.g., increase the concentration of cells
- a concentration of 2 billion cells/ml is used.
- a concentration of 1 billion cells/ml is used.
- greater than 100 million cells/ml is used.
- a concentration of cells of 10, 15, 20, 25, 30, 35, 40, 45, or 50 million cells/ml is used.
- a concentration of cells from 75, 80, 85, 90, 95, or 100 million cells/ml is used. In further aspects, concentrations of 125 or 150 million cells/ml can be used.
- concentrations can result in increased cell yield, cell activation, and cell expansion.
- use of high cell concentrations allows more efficient capture of cells that may weakly express target antigens of interest, such as CD28-negative T cells, or from samples where there are many tumor cells present (e.g., leukemic blood, tumor tissue, etc. ) . Such populations of cells may have therapeutic value and would be desirable to obtain. For example, using high concentration of cells allows more efficient selection of CD8+ T cells that normally have weaker CD28 expression.
- the concentration of cells used is 5 X 10e 6 /ml. In other aspects, the concentration used can be from about 1 X 10 5 /ml to 1 X 10 6 /ml, and any integer value in between.
- the cells may be incubated on a rotator for varying lengths of time at varying speeds at either 2-10°C or at room temperature.
- ]T cells for stimulation can also be frozen after a washing step.
- the freeze and subsequent thaw step provides a more uniform product by removing granulocytes and to some extent monocytes in the cell population.
- the cells may be suspended in a freezing solution.
- one method involves using PBS containing 20%DMSO and 8%human serum albumin, or culture media containing 10%Dextran 40 and 5%Dextrose, 20%Human Serum Albumin and 7.5%DMSO, or 31.25%Plasmalyte-A, 31.25%Dextrose 5%, 0.45%NaCl, 10%Dextran 40 and 5%Dextrose, 20%Human Serum Albumin, and 7.5%DMSO or other suitable cell freezing media containing for example, Hespan and PlasmaLyte A, the cells then are frozen to-80°C at a rate of 1° per minute and stored in the vapor phase of a liquid nitrogen storage tank. Other methods of controlled freezing may be used as well as uncontrolled freezing immediately at-20°C or in liquid nitrogen.
- cryopreserved cells are thawed and washed as described herein and allowed to rest for one hour at room temperature prior to activation using the methods of the present invention.
- a blood sample or an apheresis product is taken from a generally healthy subject.
- a blood sample or an apheresis is taken from a generally healthy subject who is at risk of developing a disease, but who has not yet developed a disease, and the cells of interest are isolated and frozen for later use.
- the T cells may be expanded, frozen, and used at a later time.
- samples are collected from a patient shortly after diagnosis of a particular disease as described herein but prior to any treatments.
- the cells are isolated from a blood sample or an apheresis from a subject prior to any number of relevant treatment modalities, including but not limited to treatment with agents such as natalizumab, efalizumab, antiviral agents, chemotherapy, radiation, immunosuppressive agents, such as cyclosporin, azathioprine, methotrexate, mycophenolate, and FK506, antibodies, or other immunoablative agents such as CAMPATH, anti-CD3 antibodies, cytoxan, fludarabine, cyclosporin, FK506, rapamycin, mycophenolic acid, steroids, FR901228, and irradiation.
- agents such as natalizumab, efalizumab, antiviral agents, chemotherapy, radiation, immunosuppressive agents, such as
- the cells are isolated for a patient and frozen for later use in conjunction with (e.g., before, simultaneously or following) bone marrow or stem cell transplantation, T cell ablative therapy using either chemotherapy agents such as, fludarabine, external-beam radiation therapy (XRT) , cyclophosphamide, or antibodies such as OKT3 or CAMPATH.
- chemotherapy agents such as, fludarabine, external-beam radiation therapy (XRT) , cyclophosphamide, or antibodies such as OKT3 or CAMPATH.
- XRT external-beam radiation therapy
- cyclophosphamide cyclophosphamide
- antibodies such as OKT3 or CAMPATH.
- the cells are isolated prior to and can be frozen for later use for treatment following B-cell ablative therapy such as agents that react with CD20, e.g., Rituxan.
- T cells are obtained from a patient directly following treatment that leaves the subject with functional T cells.
- the quality of T cells obtained may be optimal or improved for their ability to expand ex vivo.
- these cells may be in a preferred state for enhanced engraftment and in vivo expansion.
- mobilization for example, mobilization with GM-CSF
- conditioning regimens can be used to create a condition in a subject wherein repopulation, recirculation, regeneration, and/or expansion of particular cell types is favored, especially during a defined window of time following therapy.
- Illustrative cell types include T cells, B cells, dendritic cells, and other cells of the immune system.
- the NK cells are obtained from the subject.
- the NK cells are an NK cell line, e.g., NK-92 cell line (Conkwest) .
- the immune effector cell can be an allogeneic immune effector cell, e.g., T cell or NK cell.
- the cell can be an allogeneic T cell, e.g., an allogeneic T cell lacking expression of a functional T cell receptor (TCR) and/or human leukocyte antigen (HLA) , e.g., HLA class I and/or HLA class II.
- TCR T cell receptor
- HLA human leukocyte antigen
- a T cell lacking a functional TCR can be, e.g., engineered such that it does not express any functional TCR on its surface, engineered such that it does not express one or more subunits that comprise a functional TCR or engineered such that it produces very little functional TCR on its surface.
- the T cell can express a substantially impaired TCR, e.g., by expression of mutated or truncated forms of one or more of the subunits of the TCR.
- substantially impaired TCR means that this TCR will not elicit an adverse immune reaction in a host.
- a T cell described herein can be, e.g., engineered such that it does not express a functional HLA on its surface.
- a T cell described herein can be engineered such that cell surface expression HLA, e.g., HLA class 1 and/or HLA class II, is downregulated.
- the T cell can lack a functional TCR and a functional HLA, e.g., HLA class I and/or HLA class II.
- a functional TCR e.g., HLA class I and/or HLA class II.
- Modified T cells that lack expression of a functional TCR and/or HLA can be obtained by any suitable means, including a knock out or knock down of one or more subunit of TCR or HLA.
- the T cell can include a knock down of TCR and/or HLA using siRNA, shRNA, clustered regularly interspaced short palindromic repeats (CRISPR) transcription-activator like effector nuclease (TALEN) , or zinc finger endonuclease (ZFN) .
- siRNA siRNA
- shRNA clustered regularly interspaced short palindromic repeats
- CRISPR clustered regularly interspaced short palindromic repeats
- TALEN transcription-activator like effector nuclease
- ZFN zinc finger endonuclease
- the allogeneic cell can be a cell which does not expresses or expresses at low levels an inhibitory molecule, e.g. by any mehod described herein.
- the cell can be a cell that does not express or expresses at low levels an inhibitory molecule, e.g., that can decrease the ability of a CAR-expressing cell to mount an immune effector response.
- inhibitory molecules include PD1, PD-L1, CTLA4, TIM3, CEACAM (e.g., CEACAM-1, CEACAM-3 and/or CEACAM-5) , LAG3, VISTA, BTLA, TIGIT, LAIR1, CD160, 2B4 and TGFR beta.
- an inhibitory nucleic acid e.g., an inhibitory nucleic acid, e.g., a dsRNA, e.g., an siRNA or shRNA, a clustered regularly interspaced short palindromic repeats (CRISPR) , a transcription-activator like effector nuclease (TALEN) , or a zinc finger endonuclease (ZFN) , e.g., as described herein, can be used.
- an inhibitory nucleic acid e.g., an inhibitory nucleic acid, e.g., a dsRNA, e.g., an siRNA or shRNA, a clustered regularly interspaced short palindromic repeats (CRISPR) , a transcription-activator like effector nuclease (TALEN) , or a zinc finger endonuclease (ZFN) , e.g., as described herein, can be used.
- CRISPR cluster
- TCR expression and/or HLA expression can be inhibited using siRNA or shRNA that targets a nucleic acid encoding a TCR and/or HLA in a T cell.
- siRNA and shRNAs in T cells can be achieved using any conventional expression system, e.g., such as a lentiviral expression system.
- shRNAs that downregulate expression of components of the TCR are described, e.g., in US Publication No. : 2012/0321667.
- siRNA and shRNA that downregulate expression of HLA class I and/or HLA class II genes are described, e.g., in U.S. publication No. : US 2007/0036773.
- CRISPR or “CRISPR to TCR and/or HLA” or “CRISPR to inhibit TCR and/or HLA” as used herein refers to a set of clustered regularly interspaced short palindromic repeats, or a system comprising such a set of repeats.
- Cas refers to a CRISPR-associated protein.
- a “CRISPR/Cas” system refers to a system derived from CRISPR and Cas which can be used to silence or mutate a TCR and/or HLA gene.
- CRISPR/Cas systems are found in approximately 40%of sequenced eubacteria genomes and 90%of sequenced archaea. Grissa et al. (2007) BMC Bioinformatics 8: 172. This system is a type of prokaryotic immune system that confers resistance to foreign genetic elements such as plasmids and phages and provides a form of acquired immunity. Barrangou et al. (2007) Science 315: 1709-1712; Marragini et al. (2008) Science 322: 1843-1845.
- the CRISPR/Cas system has been modified for use in gene editing (silencing, enhancing or changing specific genes) in eukaryotes such as mice or primates. Wiedenheft et al. (2012) Nature 482: 331-8. This is accomplished by introducing into the eukaryotic cell a plasmid containing a specifically designed CRISPR and one or more appropriate Cas.
- the CRISPR sequence sometimes called a CRISPR locus, comprises alternating repeats and spacers.
- the spacers usually comprise sequences foreign to the bacterium such as a plasmid or phage sequence; in the TCR and/or HLA CRISPR/Cas system, the spacers are derived from the TCR or HLA gene sequence.
- RNA from the CRISPR locus is constitutively expressed and processed by Cas proteins into small RNAs. These comprise a spacer flanked by a repeat sequence. The RNAs guide other Cas proteins to silence exogenous genetic elements at the RNA or DNA level. Horvath et al. (2010) Science 327: 167-170; Makarova et al. (2006) Biology Direct 1: 7. The spacers thus serve as templates for RNA molecules, analogously to siRNAs. Pennisi (2013) Science 341: 833-836.
- CasA proteins form a functional complex, Cascade, that processes CRISPR RNA transcripts into spacer-repeat units that Cascade retains. Brouns et al. (2008) Science 321: 960-964. In other prokaryotes, Cas6 processes the CRISPR transcript.
- the CRISPR-based phage inactivation in E. coli requires Cascade and Cas3, but not Cas1 or Cas2.
- the Cmr (Cas RAMP module) proteins in Pyrococcus furiosus and other prokaryotes form a functional complex with small CRISPR RNAs that recognizes and cleaves complementary target RNAs.
- a simpler CRISPR system relies on the protein Cas9, which is a nuclease with two active cutting sites, one for each strand of the double helix. Combining Cas9 and modified CRISPR locus RNA can be used in a system for gene editing. Pennisi (2013) Science 341: 833-836.
- the CRISPR/Cas system can thus be used to edit a TCR and/or HLA gene (adding or deleting a basepair) , or introducing a premature stop which thus decreases expression of a TCR and/or HLA.
- the CRISPR/Cas system can alternatively be used like RNA interference, turning off TCR and/or HLA gene in a reversible fashion.
- the RNA can guide the Cas protein to a TCR and/or HLA promoter, sterically blocking RNA polymerases.
- TALEN or “TALEN to HLA and/or TCR” or “TALEN to inhibit HLA and/or TCR” refers to a transcription activator-like effector nuclease, an artificial nuclease which can be used to edit the HLA and/or TCR gene.
- TALENs are produced artificially by fusing a TAL effector DNA binding domain to a DNA cleavage domain.
- Transcription activator-like effects can be engineered to bind any desired DNA sequence, including a portion of the HLA or TCR gene.
- TALEs Transcription activator-like effects
- a restriction enzyme By combining an engineered TALE with a DNA cleavage domain, a restriction enzyme can be produced which is specific to any desired DNA sequence, including a HLA or TCR sequence. These can then be introduced into a cell, wherein they can be used for genome editing. Boch (2011) Nature Biotech. 29: 135-6; and Boch et al. (2009) Science 326: 1509-12; Moscou et al. (2009) Science 326: 3501.
- TALEs are proteins secreted by Xanthomonas bacteria.
- the DNA binding domain contains a repeated, highly conserved 33-34 amino acid sequence, with the exception of the 12th and 13th amino acids. These two positions are highly variable, showing a strong correlation with specific nucleotide recognition. They can thus be engineered to bind to a desired DNA sequence.
- TALEN a TALE protein is fused to a nuclease (N) , which is a wild-type or mutated FokI endonuclease.
- N nuclease
- Several mutations to FokI have been made for its use in TALENs; these, for example, improve cleavage specificity or activity. Cermak et al. (2011) Nucl. Acids Res. 39: e82; Miller et al. (2011) Nature Biotech. 29: 143-8; Hockemeyer et al. (2011) Nature Biotech. 29: 731-734; Wood et al. (2011) Science 333: 307; Doyon et al. (2010) Nature Methods 8: 74-79; Szczepek et al. (2007) Nature Biotech. 25: 786-793; and Guo et al. (2010) J. Mol. Biol. 200: 96.
- the FokI domain functions as a dimer, requiring two constructs with unique DNA binding domains for sites in the target genome with proper orientation and spacing. Both the number of amino acid residues between the TALE DNA binding domain and the FokI cleavage domain and the number of bases between the two individual TALEN binding sites appear to be important parameters for achieving high levels of activity. Miller et al. (2011) Nature Biotech. 29: 143-8.
- a HLA or TCR TALEN can be used inside a cell to produce a double-stranded break (DSB) .
- a mutation can be introduced at the break site if the repair mechanisms improperly repair the break via non-homologous end joining. For example, improper repair may introduce a frame shift mutation.
- foreign DNA can be introduced into the cell along with the TALEN; depending on the sequences of the foreign DNA and chromosomal sequence, this process can be used to correct a defect in the HLA or TCR gene or introduce such a defect into a wt HLA or TCR gene, thus decreasing expression of HLA or TCR.
- TALENs specific to sequences in HLA or TCR can be constructed using any method known in the art, including various schemes using modular components. Zhang et al. (2011) Nature Biotech. 29: 149-53; Geibler et al. (2011) PLoS ONE 6: e19509.
- Zinc finger nuclease to inhibit HLA and/or TCR
- ZFN Zinc Finger Nuclease or “ZFN to HLA and/or TCR” or “ZFN to inhibit HLA and/or TCR” refer to a zinc finger nuclease, an artificial nuclease which can be used to edit the HLA and/or TCR gene.
- a ZFN comprises a FokI nuclease domain (or derivative thereof) fused to a DNA-binding domain.
- the DNA-binding domain comprises one or more zinc fingers.
- a zinc finger is a small protein structural motif stabilized by one or more zinc ions.
- a zinc finger can comprise, for example, Cys2His2, and can recognize an approximately 3-bp sequence.
- Various zinc fingers of known specificity can be combined to produce multi-finger polypeptides which recognize about 6, 9, 12, 15 or 18-bp sequences.
- selection and modular assembly techniques are available to generate zinc fingers (and combinations thereof) recognizing specific sequences, including phage display, yeast one-hybrid systems, bacterial one-hybrid and two-hybrid systems, and mammalian cells.
- a ZFN Like a TALEN, a ZFN must dimerize to cleave DNA. Thus, a pair of ZFNs are required to target non-palindromic DNA sites. The two individual ZFNs must bind opposite strands of the DNA with their nucleases properly spaced apart. Bitinaite et al. (1998) Proc. Natl. Acad. Sci. USA 95: 10570-5.
- a ZFN can create a double-stranded break in the DNA, which can create a frame-shift mutation if improperly repaired, leading to a decrease in the expression and amount of HLA and/or TCR in a cell.
- ZFNs can also be used with homologous recombination to mutate in the HLA or TCR gene.
- ZFNs specific to sequences in HLA AND/OR TCR can be constructed using any method known in the art. See, e.g., Provasi (2011) Nature Med. 18: 807-815; Torikai (2013) Blood 122: 1341-1349; Cathomen et al. (2008) Mol. Ther. 16: 1200-7; and Guo et al. (2010) J. Mol. Biol. 400: 96; U.S. Patent Publication 2011/0158957; U.S. Patent Publication 2012/0060230.
- Cells may be activated and expanded generally using methods as described, for example, in U.S. Patents 6,352,694; 6,534,055; 6,905,680; 6,692,964; 5,858,358; 6,887,466; 6,905,681; 7,144,575; 7,067,318; 7,172,869; 7,232,566; 7,175,843; 5,883,223; 6,905,874; 6,797,514; 6,867,041; and U.S. Patent Application Publication No. 20060121005.
- the T cells of the invention may be expanded by contact with a surface having attached thereto an agent that stimulates a CD3/TCR complex associated signal and a ligand that stimulates a costimulatory molecule on the surface of the T cells.
- T cell populations may be stimulated as described herein, such as by contact with an anti-CD3 antibody, or antigen-binding fragment thereof, or an anti-CD2 antibody immobilized on a surface, or by contact with a protein kinase C activator (e.g., bryostatin) in conjunction with a calcium ionophore.
- a ligand that binds the accessory molecule is used for co-stimulation of an accessory molecule on the surface of the T cells.
- a population of T cells can be contacted with an anti-CD3 antibody and an anti-CD28 antibody, under conditions appropriate for stimulating proliferation of the T cells.
- an anti-CD3 antibody and an anti-CD28 antibody can be used as can other methods commonly known in the art (Berg et al., Transplant Proc. 30 (8) : 3975-3977, 1998; Haanen et al., J. Exp. Med. 190 (9) : 13191328, 1999; Garland et al., J. Immunol Meth. 227 (1-2) :53-63, 1999) .
- the primary stimulatory signal and the costimulatory signal for the T cell may be provided by different protocols.
- the agents providing each signal may be in solution or coupled to a surface.
- the agents may be coupled to the same surface (i.e., in “cis” formation) or to separate surfaces (i.e., in “trans” formation) .
- one agent may be coupled to a surface and the other agent in solution.
- the agent providing the costimulatory signal is bound to a cell surface and the agent providing the primary activation signal is in solution or coupled to a surface.
- both agents can be in solution.
- the agents may be in soluble form, and then cross-linked to a surface, such as a cell expressing Fc receptors or an antibody or other binding agent which will bind to the agents.
- a surface such as a cell expressing Fc receptors or an antibody or other binding agent which will bind to the agents.
- aAPCs artificial antigen presenting cells
- the two agents are immobilized on beads, either on the same bead, i.e., “cis, ” or to separate beads, i.e., “trans. ”
- the agent providing the primary activation signal is an anti-CD3 antibody or an antigen-binding fragment thereof and the agent providing the costimulatory signal is an anti-CD28 antibody or antigen-binding fragment thereof; and both agents are co-immobilized to the same bead in equivalent molecular amounts.
- a 1: 1 ratio of each antibody bound to the beads for CD4+ T cell expansion and T cell growth is used.
- a ratio of anti CD3: CD28 antibodies bound to the beads is used such that an increase in T cell expansion is observed as compared to the expansion observed using a ratio of 1: 1. In one particular aspect an increase of from about 1 to about 3 fold is observed as compared to the expansion observed using a ratio of 1: 1.
- the ratio of CD3: CD28 antibody bound to the beads ranges from 100: 1 to 1: 100 and all integer values there between.
- more anti-CD28 antibody is bound to the particles than anti-CD3 antibody, i.e., the ratio of CD3: CD28 is less than one.
- the ratio of anti CD28 antibody to anti CD3 antibody bound to the beads is greater than 2: 1.
- a 1: 100 CD3: CD28 ratio of antibody bound to beads is used. In one aspect, a 1: 75 CD3: CD28 ratio of antibody bound to beads is used. In a further aspect, a 1: 50 CD3: CD28 ratio of antibody bound to beads is used. In one aspect, a 1: 30 CD3: CD28 ratio of antibody bound to beads is used. In one preferred aspect, a 1: 10 CD3: CD28 ratio of antibody bound to beads is used. In one aspect, a 1: 3 CD3: CD28 ratio of antibody bound to the beads is used. In yet one aspect, a 3: 1 CD3: CD28 ratio of antibody bound to the beads is used.
- Ratios of particles to cells from 1: 500 to 500: 1 and any integer values in between may be used to stimulate T cells or other target cells.
- the ratio of particles to cells may depend on particle size relative to the target cell. For example, small sized beads could only bind a few cells, while larger beads could bind many.
- the ratio of cells to particles ranges from 1: 100 to 100: 1 and any integer values in-between and in further aspects the ratio comprises 1: 9 to 9: 1 and any integer values in between, can also be used to stimulate T cells.
- the ratio of anti-CD3-and anti-CD28-coupled particles to T cells that result in T cell stimulation can vary as noted above, however certain preferred values include 1: 100, 1: 50, 1: 40, 1: 30, 1: 20, 1: 10, 1: 9, 1: 8, 1: 7, 1: 6, 1: 5, 1: 4, 1: 3, 1: 2, 1:1, 2: 1, 3: 1, 4: 1, 5: 1, 6: 1, 7: 1, 8: 1, 9: 1, 10: 1, and 15: 1 with one preferred ratio being at least 1: 1 particles per T cell.
- a ratio of particles to cells of 1: 1 or less is used.
- a preferred particle: cell ratio is 1: 5.
- the ratio of particles to cells can be varied depending on the day of stimulation.
- the ratio of particles to cells is from 1: 1 to 10: 1 on the first day and additional particles are added to the cells every day or every other day thereafter for up to 10 days, at final ratios of from 1: 1 to 1: 10 (based on cell counts on the day of addition) .
- the ratio of particles to cells is 1: 1 on the first day of stimulation and adjusted to 1: 5 on the third and fifth days of stimulation.
- particles are added on a daily or every other day basis to a final ratio of 1: 1 on the first day, and 1: 5 on the third and fifth days of stimulation.
- the ratio of particles to cells is 2: 1 on the first day of stimulation and adjusted to 1: 10 on the third and fifth days of stimulation.
- particles are added on a daily or every other day basis to a final ratio of 1: 1 on the first day, and 1: 10 on the third and fifth days of stimulation.
- ratios will vary depending on particle size and on cell size and type.
- the most typical ratios for use are in the neighborhood of 1: 1, 2: 1 and 3: 1 on the first day.
- the cells such as T cells
- the cells are combined with agent-coated beads, the beads and the cells are subsequently separated, and then the cells are cultured.
- the agent-coated beads and cells prior to culture, are not separated but are cultured together.
- the beads and cells are first concentrated by application of a force, such as a magnetic force, resulting in increased ligation of cell surface markers, thereby inducing cell stimulation.
- cell surface proteins may be ligated by allowing paramagnetic beads to which anti-CD3 and anti-CD28 are attached (3x28 beads) to contact the T cells.
- the cells for example, 10 4 to 10 9 T cells
- beads for example, M-450 CD3/CD28 T paramagnetic beads at a ratio of 1: 1
- a buffer for example PBS (without divalent cations such as, calcium and magnesium)
- the target cell may be very rare in the sample and comprise only 0.01%of the sample or the entire sample (i.e., 100%) may comprise the target cell of interest. Accordingly, any cell number is within the context of the present invention.
- a concentration of about 2 billion cells/ml is used. In one aspect, greater than 100 million cells/ml is used. In a further aspect, a concentration of cells of 10, 15, 20, 25, 30, 35, 40, 45, or 50 million cells/ml is used. In yet one aspect, a concentration of cells from 75, 80, 85, 90, 95, or 100 million cells/ml is used. In further aspects, concentrations of 125 or 150 million cells/ml can be used. Using high concentrations can result in increased cell yield, cell activation, and cell expansion.
- CD28-negative T cells Such populations of cells may have therapeutic value and would be desirable to obtain in certain aspects.
- using high concentration of cells allows more efficient selection of CD8+ T cells that normally have weaker CD28 expression.
- the mixture may be cultured for several hours (about 3 hours) to about 14 days or any hourly integer value in between. In one aspect, the mixture may be cultured for 21 days. In one aspect of the invention the beads and the T cells are cultured together for about eight days. In one aspect, the beads and T cells are cultured together for 2-3 days. Several cycles of stimulation may also be desired such that culture time of T cells can be 60 days or more.
- Conditions appropriate for T cell culture include an appropriate media (e.g., Minimal Essential Media or RPMI Media 1640 or, X-vivo 15, (Lonza) ) that may contain factors necessary for proliferation and viability, including serum (e.g., fetal bovine or human serum) , interleukin-2 (IL-2) , insulin, IFN- ⁇ , IL-4, IL-7, GM-CSF, IL-10, IL-12, IL-15, TGF ⁇ , and TNF- ⁇ or any other additives for the growth of cells known to the skilled artisan.
- Other additives for the growth of cells include, but are not limited to, surfactant, plasmanate, and reducing agents such as N-acetyl-cysteine and 2-mercaptoethanol.
- Media can include RPMI 1640, AIM-V, DMEM, MEM, ⁇ -MEM, F-12, X-Vivo 15, and X-Vivo 20, Optimizer, with added amino acids, sodium pyruvate, and vitamins, either serum-free or supplemented with an appropriate amount of serum (or plasma) or a defined set of hormones, and/or an amount of cytokine (s) sufficient for the growth and expansion of T cells.
- Antibiotics e.g., penicillin and streptomycin, are included only in experimental cultures, not in cultures of cells that are to be infused into a subject.
- the target cells are maintained under conditions necessary to support growth, for example, an appropriate temperature (e.g., 37°C) and atmosphere (e.g., air plus 5%CO 2 ) .
- T cells that have been exposed to varied stimulation times may exhibit different characteristics.
- typical blood or apheresed peripheral blood mononuclear cell products have a helper T cell population (TH, CD4+) that is greater than the cytotoxic or suppressor T cell population (TC, CD8+) .
- TH, CD4+ helper T cell population
- TC, CD8+ cytotoxic or suppressor T cell population
- Ex vivo expansion of T cells by stimulating CD3 and CD28 receptors produces a population of T cells that prior to about days 8-9 consists predominately of TH cells, while after about days 8-9, the population of T cells comprises an increasingly greater population of TC cells. Accordingly, depending on the purpose of treatment, infusing a subject with a T cell population comprising predominately of TH cells may be advantageous.
- an antigen-specific subset of TC cells has been isolated it may be beneficial to expand this subset to a greater degree.
- CD4 and CD8 markers vary significantly, but in large part, reproducibly during the course of the cell expansion process. Thus, such reproducibility enables the ability to tailor an activated T cell product for specific purposes.
- a mesothelin CAR is constructed, various assays can be used to evaluate the activity of the molecule, such as but not limited to, the ability to expand T cells following antigen stimulation, sustain T cell expansion in the absence of re-stimulation, and anti-cancer activities in appropriate in vitro and animal models. Assays to evaluate the effects of a mesothelin CAR are described in further detail below
- T cells (1: 1 mixture of CD4 + and CD8 + T cells) expressing the CARs are expanded in vitro for more than 10 days followed by lysis and SDS-PAGE under reducing conditions.
- CARs containing the full length TCR- ⁇ cytoplasmic domain and the endogenous TCR- ⁇ chain are detected by western blotting using an antibody to the TCR- ⁇ chain.
- the same T cell subsets are used for SDS-PAGE analysis under non-reducing conditions to permit evaluation of covalent dimer formation.
- CAR + T cells following antigen stimulation can be measured by flow cytometry.
- a mixture of CD4 + and CD8 + T cells are stimulated with ⁇ CD3/ ⁇ CD28 aAPCs followed by transduction with lentiviral vectors expressing GFP under the control of the promoters to be analyzed.
- promoters include the CMV IE gene, EF-1 ⁇ , ubiquitin C, or phosphoglycerokinase (PGK) promoters.
- GFP fluorescence is evaluated on day 6 of culture in the CD4 + and/or CD8 + T cell subsets by flow cytometry. See, e.g., Milone et al., Molecular Therapy 17 (8) : 1453-1464 (2009) .
- a mixture of CD4 + and CD8 + T cells are stimulated with ⁇ CD3/ ⁇ CD28 coated magnetic beads on day 0, and transduced with CAR on day 1 using a bicistronic lentiviral vector expressing CAR along with eGFP using a 2A ribosomal skipping sequence.
- Cultures are re-stimulated, e.g., with K562 cells expressing hCD32 and 4-1BBL in the presence of anti-CD3 and anti-CD28 antibody (K562-BBL-3/28) following washing.
- Exogenous IL-2 is added to the cultures every other day at 100 IU/ml.
- GFP + T cells are enumerated by flow cytometry using bead-based counting. See, e.g., Milone et al., Molecular Therapy 17 (8) : 1453-1464 (2009) .
- Sustained CAR + T cell expansion in the absence of re-stimulation can also be measured. See, e.g., Milone et al., Molecular Therapy 17 (8) : 1453-1464 (2009) . Briefly, mean T cell volume (fl) is measured on day 8 of culture using a Coulter Multisizer III particle counter following stimulation with ⁇ CD3/ ⁇ CD28 coated magnetic beads on day 0, and transduction with the indicated CAR on day 1.
- T cells have been previously described, e.g., at Milone et al., Molecular Therapy 17 (8) : 1453-1464 (2009) . Briefly, assessment of CAR-mediated proliferation is performed in microtiter plates by mixing washed T cells with target cells, such as K562-Meso, Ovcar3, Ovcar8, SW1990, Panc02.03 cells expressing mesothelin or CD32 and CD137 (KT32-BBL) for a final T-cell: target cell ratio of 1: 1.
- target cells such as K562-Meso, Ovcar3, Ovcar8, SW1990, Panc02.03 cells expressing mesothelin or CD32 and CD137 (KT32-BBL) for a final T-cell: target cell ratio of 1: 1.
- Anti-CD3 (clone OKT3) and anti-CD28 (clone 9.3) monoclonal antibodies are added to cultures with KT32-BBL cells to serve as a positive control for stimulating T-cell proliferation since these signals support long-term CD8 + T cell expansion ex vivo.
- T cells are enumerated in cultures using CountBright TM fluorescent beads (Invitrogen, Carlsbad, CA) and flow cytometry as described by the manufacturer.
- CAR + T cells are identified by GFP expression using T cells that are engineered with eGFP-2A linked CAR-expressing lentiviral vectors.
- CAR+ T cells not expressing GFP the CAR+ T cells are detected with biotinylated recombinant mesothelin protein and a secondary avidin-PE conjugate.
- CD4+ and CD8 + expression on T cells are also simultaneously detected with specific monoclonal antibodies (BD Biosciences) .
- Cytokine measurements are performed on supernatants collected 24 hours following re-stimulation using the human TH1/TH2 cytokine cytometric bead array kit (BD Biosciences, San Diego, CA) according the manufacturer’s instructions. Fluorescence is assessed using a FACScalibur flow cytometer, and data is analyzed according to the manufacturer’s instructions.
- Cytotoxicity can be assessed by methods described herein, e.g., in the examples, or by a standard 51Cr-release assay. See, e.g., Milone et al., Molecular Therapy 17 (8) : 1453-1464 (2009) . Briefly, target cells (e.g., BHK or CHO cells expressing mesothelin) are loaded with 51Cr (as NaCrO4, New England Nuclear, Boston, MA) at 37°C for 2 hours with frequent agitation, washed twice in complete RPMI and plated into microtiter plates. Effector T cells are mixed with target cells in the wells in complete RPMI at varying ratios of effector cell: target cell (E:T) .
- 51Cr as NaCrO4, New England Nuclear, Boston, MA
- Click beetle red and click beetle green luciferase can be used to simultaneously follow tumor progression and T cell trafficking, as each use the same luciferin substrate but emit light at the opposite ends of the visible light spectrum.
- the present invention provides compositions and methods for treating diseases and disorders associated with mesothelin.
- An example of a disease or disorder associated with mesothelin is mesothelioma.
- Malignant mesothelioma is a type of cancer that occurs in the thin layer of cells lining the body's internal organs, known as the mesothelium.
- mesothelioma There are three recognized types of mesothelioma.
- Pleural mesothelioma e.g., malignant pleural mesothelioma, or MPM
- MPM malignant pleural mesothelioma
- Peritoneal mesothelioma occurs in the lining of the abdominal cavity, known as the peritoneum.
- Pericardial mesothelioma originates in the pericardium, which lines the heart.
- a subject may be at risk to develop mesothelioma if the subject was exposed to asbestos. Exposure to asbestos and the inhalation of asbestos particles can cause mesothelioma. In most cases, mesothelioma symptoms will not appear in a subject exposed to asbestos until many years after the exposure has occurred.
- Symptoms of pleural mesothelioma include, e.g., lower back pain or side chest pain, and shortness of breath. Other symptoms include difficulty swallowing, persistent cough, fever, weight loss or fatigue. Additional symptoms that some patients experience are muscle weakness, loss of sensory capability, coughing up blood, facial and arm swelling, and hoarseness. In the early stages of the disease, such as stage 1 mesothelioma, symptoms may be mild. Patients usually report pain in one area of the chest that never seems to go away, weight loss and fever.
- Peritoneal mesothelioma originates in the abdomen and as a result, symptoms often include abdominal pain, weight loss, nausea, and vomiting. Fluid buildup may occur in the abdomen as well as a result of the cancer. Peritoneal mesothelioma originates in the abdomen and will frequently spread to other organs in area including the liver, spleen or bowel. Severe abdominal pain is the most common complaint that patients first experience. There may also be a discomfort level with fluid buildup in the abdomen as well. Other symptoms of peritoneal mesothelioma may include difficult bowel movements, nausea and vomiting, fever and swollen feet.
- Pericardial mesothelioma is the least common form of mesothelioma. Pericardial mesothelioma, as the name suggests, involves the heart. This rare type of mesothelioma cancer invades the pericardium, the sac that surrounds the heart. As the cancer progresses, the heart is not able to deliver oxygen as efficiently to the body causing further decline in health at an increasingly rapid rate. The symptoms most commonly associated with pericardial mesothelioma mimic those of a heart attack: nausea, pain in the chest and shortness of breath.
- Subjects benefiting from treatment according to the invention include subjects with a mesothelioma, or subjects suspected of having mesothelioma, e.g., as evidenced by the presence of one or more of the symptoms described herein and/or exposure to asbestos.
- the mesothelioma is pleural mesothelioma (e.g., malignant pleural mesothelioma) .
- the subject may be treated that has a precancerous condition such as, e.g., pleural plaques, benign mesothelioma or mesothelial hyperplasia.
- pancreatic cancers that can be treated with methods described herein include, but are not limited to, exocrine pancreatic cancers and endocrine pancreatic cancers.
- Exocrine pancreatic cancers include, but are not limited to, adenocarcinomas, acinar cell carcinomas, adenosquamous carcinomas, colloid carcinomas, undifferentiated carcinomas with osteoclast-like giant cells, hepatoid carcinomas, intraductal papillary-mucinous neoplasms, mucinous cystic neoplasms, pancreatoblastomas, serous cystadenomas, signet ring cell carcinomas, solid and pseuodpapillary tumors, pancreatic ductal carcinomas, and undifferentiated carcinomas.
- the exocrine pancreatic cancer is pancreatic ductal carcinoma.
- Endocrine pancreatic cancers include, but are not limited to, insulinomas and glucagonomas.
- the pancreatic cancer is any of early stage pancreatic cancer, non-metastatic pancreatic cancer, primary pancreatic cancer, resected pancreatic cancer, advanced pancreatic cancer, locally advanced pancreatic cancer, metastatic pancreatic cancer, unresectable pancreatic cancer, pancreatic cancer in remission, recurrent pancreatic cancer, pancreatic cancer in an adjuvant setting, or pancreatic cancer in a neoadjuvant setting.
- the pancreatic cancer is locally advanced pancreatic cancer, unresectable pancreatic cancer, or metastatic pancreatic ductal carcinoma.
- the pancreatic cancer is resistant to the gemcitabine-based therapy.
- the pancreatic cancer is refractory to the gemcitabine-based therapy.
- the disorder associated with mesothelin expression is ovarian cancer.
- Ovarian cancer is classified according to the histology of the tumor.
- Surface epithelial-stromal tumor also known as ovarian epithelial carcinoma, is the most common type of ovarian cancer. It includes serous tumor (including serous papillary cystadenocarcinoma) , endometrioid tumor and mucinous cystadenocarcinoma.
- stage I stage I
- stage II stage III
- stage IV stage IV
- Staging can be performed, e.g., when the ovarian cancer is removed.
- Ovarian cancer is staged as follows:
- Stage I cancer is confined to one or both ovaries.
- the cancer is stage II if either one or both of the ovaries is involved and has spread to the uterus and/or the fallopian tubes or other sites in the pelvis.
- the cancer is stage III cancer if one or both of the ovaries is involved and has spread to lymph nodes or other sites outside of the pelvis but is still within the abdominal cavity, such as the surface of the intestine or liver.
- the cancer is stage IV cancer if one or both ovaries are involved and the cancer has spread outside the abdomen or to the inside of the liver.
- the ovarian cancer is resistant to one or more chemotherapeutic agent. In some embodiments, the ovarian cancer is refractory to the one or more chemotherapeutic agent.
- cancers that can be treated with the CAR compositions described herein include, e.g., brain cancer, bladder cancer, breast cancer, cervical cancer, colorectal cancer, liver cancer, kidney cancer, lymphoma, leukemia, lung cancer (e.g., lung adenocarcinoma) , melanoma, metastatic melanoma, mesothelioma, neuroblastoma, ovarian cancer, prostate cancer, pancreatic cancer, renal cancer, skin cancer, thymoma, sarcoma, non-Hodgkin's lymphoma, Hodgkin’s lymphoma, uterine cancer, and any combination thereof.
- lung cancer e.g., lung adenocarcinoma
- melanoma metastatic melanoma
- mesothelioma neuroblastoma
- ovarian cancer prostate cancer
- pancreatic cancer renal cancer
- skin cancer thymoma
- sarcoma
- the present invention provides methods for inhibiting the proliferation or reducing a mesothelin-expressing cell population, the methods comprising contacting a population of cells comprising a mesothelin expressing cell with a mesothelin CAR-expressing cell of the invention that binds to the mesothelin-expressing cell.
- the invention provides methods for inhibiting the proliferation or reducing the population of cancer cells expressing mesothelin, the methods comprising contacting the mesothelin -expressing cancer cell population with a mesothelin CAR-expressing cell of the invention that binds to the mesothelin-expressing cell.
- the invention provides methods for inhibiting the proliferation or reducing the population of cancer cells expressing mesothelin, the methods comprising contacting the mesothelin -expressing cancer cell population with a mesothelin CAR-expressing cell of the invention that binds to the mesothelin-expressing cell.
- the mesothelin CAR-expressing cell of the invention reduces the quantity, number, amount or percentage of cells and/or cancer cells by at least 25%, at least 30%, at least 40%, at least 50%, at least 65%, at least 75%, at least 85%, at least 95%, or at least 99%in a subject with or animal model of mesothelioma or another cancer associated with mesothelin -expressing cells relative to a negative control.
- the subject is a human.
- the invention also provides methods for preventing, treating and/or managing a disorder associated with mesothelin -expressing cells (e.g., mesothelioma) , the methods comprising administering to a subject in need a mesothelioma CAR-expressing cell of the invention that binds to the mesothelin -expressing cell.
- a disorder associated with mesothelin -expressing cells e.g., mesothelioma
- the methods comprising administering to a subject in need a mesothelioma CAR-expressing cell of the invention that binds to the mesothelin -expressing cell.
- the subject is a human.
- the invention provides methods for preventing relapse of cancer associated with mesothelin-expressing cells, the methods comprising administering to a subject in need thereof a mesothelin CAR-expressing cell of the invention that binds to the mesothelin-expressing cell.
- the methods comprise administering to the subject in need thereof an effective amount of a mesothelin CAR-expressing cell of the invention that binds to the mesothelin-expressing cell in combination with an effective amount of another therapy.
- the invention pertains to a vector comprising a sequence encoding a mesothelin CAR operably linked to promoter for expression in mammalian immune effector cells.
- the invention provides a recombinant immune effector cell expressing the mesothelin CAR for use in treating mesothelin -expressing tumors.
- the mesothelin CAR-expressing cell of the invention is capable of contacting a tumor cell with at least one mesothelin CAR of the invention expressed on its surface such that the mesothelin CAR-expressing cell is activated in response to the antigen and the CAR-expressing cell targets the cancer cell and growth of the cancer is inhibited.
- the invention pertains to a method of inhibiting growth of a mesothelin -expressing cancer cell, comprising contacting the tumor cell with a-mesothelin CAR-expressing cell such that the CAR-expressing cell is activated in response to the antigen and targets the cancer cell, wherein the growth of the cancer is inhibited.
- the activated CART targets and kills the cancer cell.
- the invention pertains to a method of treating cancer in a subject.
- the method comprises administering to the subject a mesothelin CAR-expressing cell such that the cancer is treated in the subject.
- a cancer that is treatable by the mesothelin CAR-expressing cell of the invention is a cancer associated with expression of mesothelin.
- the cancer associated with expression of mesothelin is selected from mesothelioma, pancreatic cancer, ovarian cancer and lung cancer.
- the invention includes a type of cellular therapy where immune effector cells, e.g., T cells or NK cells, are genetically modified to express a chimeric antigen receptor (CAR) and the CAR-expressing cell is infused to a recipient in need thereof.
- the infused cell is able to kill tumor cells in the recipient.
- CAR-modified immune effector cells are able to replicate in vivo resulting in long-term persistence that can lead to sustained tumor control.
- the cells administered to the patient, or their progeny persist in the patient for at least four months, five months, six months, seven months, eight months, nine months, ten months, eleven months, twelve months, thirteen months, fourteen month, fifteen months, sixteen months, seventeen months, eighteen months, nineteen months, twenty months, twenty-one months, twenty-two months, twenty-three months, two years, three years, four years, or five years after administration of the cell to the patient.
- the invention also includes a type of cellular therapy where immune effector cells are modified, e.g., by in vitro transcribed RNA, to transiently express a chimeric antigen receptor (CAR) and the CAR-expressing cell is infused to a recipient in need thereof.
- the infused cell is able to kill cancer cells in the recipient.
- the cells administered to the patient is present for less than one month, e.g., three weeks, two weeks, one week, after administration of the cell to the patient.
- the anti-cancer immunity response elicited by the CAR-modified immune effector cells may be an active or a passive immune response, or alternatively may be due to a direct vs indirect immune response.
- the CAR transduced T cells exhibit specific proinflammatory cytokine secretion and potent cytolytic activity in response to human cancer cells expressing mesothelin, and mediate bystander killing and mediate regression of an established human tumor.
- antigen-less tumor cells within a heterogeneous field of mesothelin-expressing tumor may be susceptible to indirect destruction by mesothelin-redirected T cells that has previously reacted against adjacent antigen-positive cancer cells.
- the fully-human scFv bearing CAR-modified immune effector cells of the invention may be a type of vaccine for ex vivo immunization and/or in vivo therapy in a mammal.
- the mammal is a human.
- cells are isolated from a mammal (e.g., a human) and genetically modified (i.e., transduced or transfected in vitro) with a vector expressing a CAR disclosed herein.
- the CAR-modified cell can be administered to a mammalian recipient to provide a therapeutic benefit.
- the mammalian recipient may be a human and the CAR-modified cell can be autologous with respect to the recipient.
- the cells can be allogeneic, syngeneic or xenogeneic with respect to the recipient.
- ex vivo culture and expansion of T cells comprises: (1) collecting CD34+ hematopoietic stem and progenitor cells from a mammal from peripheral blood harvest or bone marrow explants; and (2) expanding such cells ex vivo.
- other factors such as flt3-L, IL-1, IL-3 and c-kit ligand, can be used for culturing and expansion of the cells.
- the present invention also provides compositions and methods for in vivo immunization to elicit an immune response directed against an antigen in a patient.
- the cells activated and expanded as described herein may be utilized in the treatment and prevention of diseases that arise in individuals who are immunocompromised.
- the CAR-modified immune effector cells of the invention are used in the treatment of diseases, disorders and conditions associated with expression of mesothelin.
- the cells of the invention are used in the treatment of patients at risk for developing diseases, disorders and conditions associated with expression of mesothelin.
- the invention provides methods for the treatment or prevention of diseases, disorders and conditions associated with expression of mesothelin comprising administering to a subject in need thereof, a therapeutically effective amount of the CAR-modified T cells of the invention.
- the CAR-modified T cells of the present invention may be administered either alone, or as a pharmaceutical composition in combination with diluents and/or with other components such as IL-2 or other cytokines or cell populations.
- the present invention also provides methods for inhibiting the proliferation or reducing a mesothelin-expressing cell population, the methods comprising contacting a population of cells comprising a mesothelin-expressing cell with a mesothelin CAR-expressing cell (, e.g., a mesothelin CART also referred to as “CART-MSLN” ) of the invention that binds to the mesothelin-expressing cell.
- a mesothelin CAR-expressing cell e.g., a mesothelin CART also referred to as “CART-MSLN”
- the invention provides methods for inhibiting the proliferation or reducing the population of cancer cells expressing mesothelin, the methods comprising contacting the mesothelin-expressing cancer cell population with a mesothelin CAR-expressing cell of the invention that binds to the mesothelin-expressing cell.
- the present invention provides methods for inhibiting the proliferation or reducing the population of cancer cells expressing mesothelin, the methods comprising contacting the mesothelin-expressing cancer cell population with a mesothelin CAR-expressing cell of the invention that binds to the mesothelin-expressing cell.
- the mesothelin CAR-expressing cell of the invention reduces the quantity, number, amount or percentage of cells and/or cancer cells by at least 25%, at least 30%, at least 40%, at least 50%, at least 65%, at least 75%, at least 85%, at least 95%, or at least 99%in a subject with or animal model for mesothelioma or another cancer associated with mesothelin-expressing cells relative to a negative control.
- the subject is a human.
- the present invention also provides methods for preventing, treating and/or managing a disease associated with mesothelin-expressing cells (e.g., mesothelioma) , the methods comprising administering to a subject in need a mesothelin CAR-expressing cell of the invention that binds to the mesothelin-expressing cell.
- a disease associated with mesothelin-expressing cells e.g., mesothelioma
- the methods comprising administering to a subject in need a mesothelin CAR-expressing cell of the invention that binds to the mesothelin-expressing cell.
- the subject is a human.
- the present invention provides methods for preventing relapse of cancer associated with mesothelin-expressing cells, the methods comprising administering to a subject in need thereof a mesothelin CAR-expressing cell of the invention that binds to the mesothelin-expressing cell.
- the methods comprise administering to the subject in need thereof an effective amount of a mesothelin CAR-expressing cell of the invention that binds to the mesothelin-expressing cell in combination with an effective amount of another therapy.
- a CAR-expressing cell described herein may be used in combination with other known agents and therapies.
- Administered “in combination” means that two (or more) different treatments are delivered to the subject during the course of the subject's affliction with the disorder, e.g., the two or more treatments are delivered after the subject has been diagnosed with the disorder and before the disorder has been cured or eliminated or treatment has ceased for other reasons.
- the delivery of one treatment is still occurring when the delivery of the second begins, so that there is overlap in terms of administration. This is sometimes referred to herein as “simultaneous” or “concurrent delivery” .
- the delivery of one treatment ends before the delivery of the other treatment begins.
- the treatment is more effective because of combined administration.
- the second treatment is more effective, e.g., an equivalent effect is seen with less of the second treatment, or the second treatment reduces symptoms to a greater extent, than would be seen if the second treatment were administered in the absence of the first treatment, or the analogous situation is seen with the first treatment.
- delivery is such that the reduction in a symptom, or other parameter related to the disorder is greater than what would be observed with one treatment delivered in the absence of the other.
- the effect of the two treatments can be partially additive, wholly additive, or greater than additive.
- the delivery can be such that an effect of the first treatment delivered is still detectable when the second is delivered.
- a CAR-expressing cell described herein and the at least one additional therapeutic agent can be administered simultaneously, in the same or in separate compositions, or sequentially.
- the CAR-expressing cell described herein can be administered first, and the additional agent can be administered second, or the order of administration can be reversed.
- a CAR-expressing cell described herein may be used in a treatment regimen in combination with surgery, chemotherapy, radiation, immunosuppressive agents, such as cyclosporin, azathioprine, methotrexate, mycophenolate, and FK506, antibodies, or other immunoablative agents such as CAMPATH, anti-CD3 antibodies or other antibody therapies, cytoxin, fludarabine, cyclosporin, FK506, rapamycin, mycophenolic acid, steroids, FR901228, cytokines, and irradiation.
- peptide vaccine such as that described in Izumoto et al. 2008 J Neurosurg 108: 963-971.
- a CAR-expressing cell described herein can be used in combination with a chemotherapeutic agent.
- chemotherapeutic agents include an anthracycline (e.g., doxorubicin (e.g., liposomal doxorubicin) ) .
- a vinca alkaloid e.g., vinblastine, vincristine, vindesine, vinorelbine
- an alkylating agent e.g., cyclophosphamide, decarbazine, melphalan, ifosfamide, temozolomide
- an immune cell antibody e.g., alemtuzamab, gemtuzumab, rituximab, tositumomab
- an antimetabolite including, e.g., folic acid antagonists, pyrimidine analogs, purine analogs and adenosine deaminase inhibitors (e.g., fludarabine)
- an mTOR inhibitor e.g., TNFR glucocorticoid induced TNFR related protein (GITR) agonist
- a proteasome inhibitor e.g., aclacinomycin A, gliotoxin or bortezomib
- Chemotherapeutic agents considered for use in combination therapies include anastrozole bicalutamide bleomycin sulfate busulfan busulfan injection capecitabine N4- pentoxycarbonyl-5-deoxy-5-fluorocytidine, carboplatin carmustine chlorambucil cisplatin cladribine cyclophosphamide cytarabine, cytosine arabinoside cytarabine liposome injection dacarbazine dactinomycin (Actinomycin D, Cosmegan) , daunorubicin hydrochloride daunorubicin citrate liposome injection dexamethasone, docetaxel doxorubicin hydrochloride etoposide fludarabine phosphate 5-fluorouracil flutamide tezacitibine, Gemcitabine (difluorodeoxycitidine) , hydroxyurea Idarubicin ifosfamide iri
- alkylating agents include, without limitation, nitrogen mustards, ethylenimine derivatives, alkyl sulfonates, nitrosoureas and triazenes) : uracil mustard (Aminouracil Uracil nitrogen chlormethine cyclophosphamide Revimmune TM ) , ifosfamide melphalan Chlorambucil pipobroman triethylenemelamine triethylenethiophosphoramine, Temozolomide thiotepa busulfan carmustine lomustine streptozocin and dacarbazine
- Additional exemplary alkylating agents include, without limitation, Oxaliplatin Temozolomide Dactinomycin (also known as actinomycin-D, Melphalan (also known as L-PAM, L-sarcolysin, and phenylalanine mustard, Altretamine (also known as hexamethylmelamine (HMM) , Carmustine Bendamustine Busulfan Car
- Exemplary mTOR inhibitors include, e.g., temsirolimus; ridaforolimus (formally known as deferolimus, (1R, 2R, 4S) -4- [ (2R) -2 [ (1R, 9S, 12S, 15R, 16E, 18R, 19R, 21R, 23S, 24E, 26E, 28Z, 30S, 32S, 35R) -1, 18-dihydroxy-19, 30-dimethoxy-15, 17, 21, 23, 29, 35-hexamethyl-2, 3, 10, 14, 20-pentaoxo-11, 36-dioxa-4-azatricyclo [30.3.1.0 4,9 ] hexatriaconta-16,24, 26, 28-tetraen-12-yl] propyl] -2-methoxycyclohexyl dimethylphosphinate, also known as AP23573 and MK8669, and described in PCT Publication No.
- immunomodulators include, e.g., afutuzumab (available from pegfilgrastim lenalidomide (CC-5013, thalidomide actimid (CC4047) ; and IRX-2 (mixture of human cytokines including interleukin 1, interleukin 2, and interferon ⁇ , CAS 951209-71-5, available from IRX Therapeutics) .
- afutuzumab available from pegfilgrastim lenalidomide (CC-5013, thalidomide actimid (CC4047)
- IRX-2 mixture of human cytokines including interleukin 1, interleukin 2, and interferon ⁇ , CAS 951209-71-5, available from IRX Therapeutics
- anthracyclines include, e.g., doxorubicin bleomycin daunorubicin (dauorubicin hydrochloride, daunomycin, and rubidomycin hydrochloride, daunorubicin liposomal (daunorubicin citrate liposome, mitoxantrone (DHAD, epirubicin (Ellence TM ) ; idarubicin Idamycin mitomycin C geldanamycin; herbimycin; ravidomycin; and desacetylravidomycin.
- doxorubicin bleomycin daunorubicin daunorubicin hydrochloride, daunomycin, and rubidomycin hydrochloride
- daunorubicin liposomal daunorubicin citrate liposome, mitoxantrone (DHAD, epirubicin (Ellence TM )
- DHAD mitoxantrone
- vinca alkaloids include, e.g., vinorelbine tartrate Vincristine and Vindesine vinblastine (also known as vinblastine sulfate, vincaleukoblastine and VLB, and vinorelbine
- Exemplary proteosome inhibitors include bortezomib carfilzomib (PX-171-007, (S) -4-Methyl-N- ( (S) -1- ( ( (S) -4-methyl-1- ( (R) -2-methyloxiran-2-yl) -1-oxopentan-2-yl)amino) -1-oxo-3-phenylpropan-2-yl) -2- ( (S) -2- (2-morpholinoacetamido) -4-phenylbutanamido) -pentanamide) ; marizomib (NPI-0052) ; ixazomib citrate (MLN-9708) ; delanzomib (CEP-18770) ; and O-Methyl-N- [ (2-methyl-5-thiazolyl) carbonyl] -L-seryl-O-methyl-N- [ (1S) -2- [ (2R) -2-methyl-2-
- a CAR expressing cell described herein is administered to a subject in combination with a molecule targeting GITR and/or modulating GITR functions, such as a GITR agonist and/or a GITR antibody that depletes regulatory T cells (Tregs) .
- a molecule targeting GITR and/or modulating GITR functions such as a GITR agonist and/or a GITR antibody that depletes regulatory T cells (Tregs) .
- the GITR binding molecules and/or molecules modulating GITR functions e.g., GITR agonist and/or Treg depleting GITR antibodies
- the GITR agonist can be administered prior to apheresis of the cells.
- Exemplary GITR agonists include, e.g., GITR fusion proteins and anti-GITR antibodies (e.g., bivalent anti-GITR antibodies) such as, e.g., a GITR fusion protein described in U.S. Patent No. : 6, 111, 090, European Patent No. : 090505B1, U.SPatent No. : 8,586, 023, PCT Publication Nos. : WO 2010/003118 and 2011/090754, or an anti-GITR antibody described, e.g., in U.S. Patent No. : 7, 025, 962, European Patent No. : 1947183B1, U.S. Patent No. : 7,812, 135, U.S. Patent No.
- a CAR expressing cell described herein is administered to a subject in combination with an mTOR inhibitor, e.g., an mTOR inhibitor described herein, e.g., a rapalog such as everolimus.
- an mTOR inhibitor e.g., an mTOR inhibitor described herein, e.g., a rapalog such as everolimus.
- the mTOR inhibitor is administered prior to the CAR-expressing cell.
- the mTOR inhibitor can be administered prior to apheresis of the cells.
- a CAR expressing cell described herein is administered to a subject in combination with a GITR agonist, e.g., a GITR agonist described herein.
- a GITR agonist e.g., a GITR agonist described herein.
- the GITR agonist is administered prior to the CAR-expressing cell.
- the GITR agonist can be administered prior to apheresis of the cells.
- a CAR expressing cell described herein is administered to a subject in combination with a protein tyrosine phosphatase inhibitor, e.g., a protein tyrosine phosphatase inhibitor described herein.
- a protein tyrosine phosphatase inhibitor e.g., a protein tyrosine phosphatase inhibitor described herein.
- the protein tyrosine phosphatase inhibitor is an SHP-1 inhibitor, e.g., an SHP-1 inhibitor described herein, such as, e.g., sodium stibogluconate.
- the protein tyrosine phosphatase inhibitor is an SHP-2 inhibitor, e.g., an SHP-2 inhibitor described herein.
- a CAR-expressing cell described herein can be used in combination with a kinase inhibitor.
- the kinase inhibitor is a CDK4 inhibitor, e.g., a CDK4 inhibitor described herein, e.g., a CDK4/6 inhibitor, such as, e.g., 6-Acetyl-8-cyclopentyl-5-methyl-2- (5-piperazin-1-yl-pyridin-2-ylamino) -8H-pyrido [2, 3-d]pyrimidin-7-one, hydrochloride (also referred to as palbociclib or PD0332991) .
- the kinase inhibitor is a BTK inhibitor, e.g., a BTK inhibitor described herein, such as, e.g., ibrutinib.
- the kinase inhibitor is an mTOR inhibitor, e.g., an mTOR inhibitor described herein, such as, e.g., rapamycin, a rapamycin analog, OSI-027.
- the mTOR inhibitor can be, e.g., an mTORC1 inhibitor and/or an mTORC2 inhibitor, e.g., an mTORC1 inhibitor and/or mTORC2 inhibitor described herein.
- the kinase inhibitor is a MNK inhibitor, e.g., a MNK inhibitor described herein, such as, e.g., 4-amino-5- (4-fluoroanilino) -pyrazolo [3, 4-d] pyrimidine.
- the MNK inhibitor can be, e.g., a MNK1a, MNK1b, MNK2a and/or MNK2b inhibitor.
- the kinase inhibitor is a dual PI3K/mTOR inhibitor described herein, such as, e.g., PF-04695102.
- the kinase inhibitor is a DGK inhibitor, e.g., a DGK inhibitor described herein, such as, e.g., DGKinh1 (D5919) or DGKinh2 (D5794) .
- the kinase inhibitor is a CDK4 inhibitor selected from aloisine A; flavopiridol or HMR-1275, 2- (2-chlorophenyl) -5, 7-dihydroxy-8- [ (3S, 4R) -3-hydroxy-1-methyl-4-piperidinyl] -4-chromenone; crizotinib (PF-02341066; 2- (2-Chlorophenyl) -5, 7-dihydroxy-8-[(2R, 3S) -2- (hydroxymethyl) -1-methyl-3-pyrrolidinyl] -4H-1-benzopyran-4-one, hydrochloride (P276-00) ; 1-methyl-5- [ [2- [5- (trifluoromethyl) -1H-imidazol-2-yl] -4-pyridinyl] oxy] -N- [4-(trifluoromethyl) phenyl] -1H-benzimidazol-2-amine (RAF265) ; indi
- the kinase inhibitor is a CDK4 inhibitor, e.g., palbociclib (PD0332991) , and the palbociclib is administered at a dose of about 50 mg, 60 mg, 70 mg, 75 mg, 80 mg, 90 mg, 100 mg, 105 mg, 110 mg, 115 mg, 120 mg, 125 mg, 130 mg, 135 mg (e.g., 75 mg, 100 mg or 125 mg) daily for a period of time, e.g., daily for 14-21 days of a 28 day cycle, or daily for 7-12 days of a 21 day cycle. In one embodiment, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 or more cycles of palbociclib are administered.
- the kinase inhibitor is a BTK inhibitor selected from ibrutinib (PCI-32765) ; GDC-0834; RN-486; CGI-560; CGI-1764; HM-71224; CC-292; ONO-4059; CNX-774; and LFM-A13.
- the BTK inhibitor does not reduce or inhibit the kinase activity of interleukin-2-inducible kinase (ITK) , and is selected from GDC-0834; RN-486; CGI-560; CGI-1764; HM-71224; CC-292; ONO-4059; CNX-774; and LFM-A13.
- the kinase inhibitor is a BTK inhibitor, e.g., ibrutinib (PCI-32765) , and the ibrutinib is administered at a dose of about 250 mg, 300 mg, 350 mg, 400 mg, 420 mg, 440 mg, 460 mg, 480 mg, 500 mg, 520 mg, 540 mg, 560 mg, 580 mg, 600 mg (e.g., 250 mg, 420 mg or 560 mg) daily for a period of time, e.g., daily for 21 day cycle cycle, or daily for 28 day cycle. In one embodiment, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 or more cycles of ibrutinib are administered.
- PCI-32765 BTK inhibitor
- the ibrutinib is administered at a dose of about 250 mg, 300 mg, 350 mg, 400 mg, 420 mg, 440 mg, 460 mg, 480 mg, 500 mg, 520 mg, 540 mg, 560 mg, 580 mg, 600
- the kinase inhibitor is an mTOR inhibitor selected from temsirolimus; ridaforolimus (1R, 2R, 4S) -4- [ (2R) -2 [ (1R, 9S, 12S, 15R, 16E, 18R, 19R, 21R, 23S, 24E, 26E, 28Z, 30S, 32S, 35R) -1, 18-dihydroxy-19, 30-dimethoxy-15, 17, 21, 23, 29, 35-hexamethyl-2, 3, 10, 14, 20-pentaoxo-11, 36-dioxa-4-azatricyclo [30.3.1.0 4,9 ] hexatriaconta-16,24, 26, 28-tetraen-12-yl] propyl] -2-methoxycyclohexyl dimethylphosphinate, also known as AP23573 and MK8669; everolimus (RAD001) ; rapamycin (AY22989) ; simapimod; (5- ⁇ 2, 4-bis[ (3R, 9
- the kinase inhibitor is an mTOR inhibitor, e.g., rapamycin, and the rapamycin is administered at a dose of about 3 mg, 4 mg, 5 mg, 6 mg, 7 mg, 8 mg, 9 mg, 10 mg (e.g., 6 mg) daily for a period of time, e.g., daily for 21 day cycle cycle, or daily for 28 day cycle. In one embodiment, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 or more cycles of rapamycin are administered.
- the kinase inhibitor is an mTOR inhibitor, e.g., everolimus and the everolimus is administered at a dose of about 2 mg, 2.5 mg, 3 mg, 4 mg, 5 mg, 6 mg, 7 mg, 8 mg, 9 mg, 10 mg, 11 mg, 12 mg, 13 mg, 14 mg, 15 mg (e.g., 10 mg) daily for a period of time, e.g., daily for 28 day cycle. In one embodiment, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 or more cycles of everolimus are administered.
- the kinase inhibitor is an MNK inhibitor selected from CGP052088; 4-amino-3- (p-fluorophenylamino) -pyrazolo [3, 4-d] pyrimidine (CGP57380) ; cercosporamide; ETC-1780445-2; and 4-amino-5- (4-fluoroanilino) -pyrazolo [3, 4-d] pyrimidine.
- the kinase inhibitor is a dual phosphatidylinositol 3-kinase (PI3K) and mTOR inhibitor selected from 2-Amino-8- [trans-4- (2-hydroxyethoxy) cyclohexyl] -6- (6-methoxy-3-pyridinyl) -4-methyl-pyrido [2, 3-d] pyrimidin-7 (8H) -one (PF-04691502) ; N- [4- [ [4-(Dimethylamino) -1-piperidinyl] carbonyl] phenyl] -N'- [4- (4, 6-di-4-morpholinyl-1, 3, 5-triazin-2-yl)phenyl] urea (PF-05212384, PKI-587) ; 2-Methyl-2- ⁇ 4- [3-methyl-2-oxo-8- (quinolin-3-yl) -2, 3- dihydro-1H-imidazo [4, 5-c] qui
- Drugs that inhibit either the calcium dependent phosphatase calcineurin (cyclosporine and FK506) or inhibit the p70S6 kinase that is important for growth factor induced signaling (rapamycin) can also be used.
- the cell compositions of the present invention may be administered to a patient in conjunction with (e.g., before, simultaneously or following) bone marrow transplantation, T cell ablative therapy using chemotherapy agents such as, fludarabine, external-beam radiation therapy (XRT) , cyclophosphamide, and/or antibodies such as OKT3 or CAMPATH.
- chemotherapy agents such as, fludarabine, external-beam radiation therapy (XRT) , cyclophosphamide, and/or antibodies such as OKT3 or CAMPATH.
- the cell compositions of the present invention are administered following B-cell ablative therapy such as agents that react with CD20, e.g., Rituxan.
- subjects may undergo standard treatment with high dose chemotherapy followed by peripheral blood stem cell transplantation.
- subjects receive an infusion of the expanded immune cells of the present invention.
- expanded cells are administered before or following surgery.
- the subject can be administered an agent which reduces or ameliorates a side effect associated with the administration of a CAR-expressing cell.
- Side effects associated with the administration of a CAR-expressing cell include, but are not limited to CRS, and hemophagocytic lymphohistiocytosis (HLH) , also termed Macrophage Activation Syndrome (MAS) .
- HHL hemophagocytic lymphohistiocytosis
- MAS Macrophage Activation Syndrome
- Symptoms of CRS include high fevers, nausea, transient hypotension, hypoxia, and the like.
- CRS may include clinical constitutional signs and symptoms such as fever, fatigue, anorexia, myalgias, arthalgias, nausea, vomiting, and headache.
- CRS may include clinical skin signs and symptoms such as rash.
- CRS may include clinical gastrointestinal signs and symsptoms such as nausea, vomiting and diarrhea.
- CRS may include clinical respiratory signs and symptoms such as tachypnea and hypoxemia.
- CRS may include clinical cardiovascular signs and symptoms such as tachycardia, widened pulse pressure, hypotension, increased cardac output (early) and potentially diminished cardiac output (late) .
- CRS may include clinical coagulation signs and symptoms such as elevated d-dimer, hypofibrinogenemia with or without bleeding.
- CRS may include clinical renal signs and symptoms such as azotemia.
- CRS may include clinical hepatic signs and symptoms such as transaminitis and hyperbilirubinemia.
- CRS may include clinical neurologic signs and symptoms such as headache, mental status changes, confusion, delirium, word finding difficulty or frank aphasia, hallucinations, tremor, dymetria, altered gait, and seizures.
- the methods described herein can comprise administering a CAR-expressing cell described herein to a subject and further administering one or more agents to manage elevated levels of a soluble factor resulting from treatment with a CAR-expressing cell.
- the soluble factor elevated in the subject is one or more of IFN- ⁇ , TNF ⁇ , IL-2 and IL-6.
- the factor elevated in the subject is one or more of IL-1, GM-CSF, IL-10, IL-8, IL-5 and fraktalkine. Therefore, an agent administered to treat this side effect can be an agent that neutralizes one or more of these soluble factors.
- the agent that neutralizes one or more of these soluble forms is an antibody or antigen binding fragment thereof.
- TNF ⁇ inhibitors examples include, but are not limited to a steroid (e.g., corticosteroid) , an inhibitor of TNF ⁇ , and an inhibitor of IL-6.
- a TNF ⁇ inhibitor is an anti-TNF ⁇ antibody molecule such as, infliximab, adalimumab, certolizumab pegol, and golimumab.
- a TNF ⁇ inhibitor is a fusion protein such as entanercept.
- Small molecule inhibitor of TNF ⁇ include, but are not limited to, xanthine derivatives (e.g. pentoxifylline) and bupropion.
- an IL-6 inhibitor is an anti-IL-6 antibody molecule or an anti-IL-6 receptor antibody molecule such as tocilizumab (toc) , sarilumab, elsilimomab, CNTO 328, ALD518/BMS-945429, CNTO 136, CPSI-2364, CDP6038, VX30, ARGX-109, FE301, and FM101.
- the anti-IL-6 antibody molecule is tocilizumab.
- An example of an IL-1R based inhibitor is anakinra.
- the subject is administered a corticosteroid, such as, e.g., methylprednisolone, hydrocortisone, among others.
- a corticosteroid such as, e.g., methylprednisolone, hydrocortisone, among others.
- the subject is administered a vasopressor, such as, e.g., norepinephrine, dopamine, phenylephrine, epinephrine, vasopressin, or a combination thereof.
- a vasopressor such as, e.g., norepinephrine, dopamine, phenylephrine, epinephrine, vasopressin, or a combination thereof.
- the subject can be administered an antipyretic agent. In an embodiment, the subject can be administered an analgesic agent.
- the subject can be administered an agent which enhances the activity or fitness of a CAR-expressing cell.
- the agent can be an agent which inhibits a molecule that modulates or regulates, e.g., inhibits, T cell function.
- the molecule that modulates or regulates T cell function is an inhibitory molecule.
- Inhibitory molecules e.g., Programmed Death 1 (PD1) , can, in some embodiments, decrease the ability of a CAR-expressing cell to mount an immune effector response.
- PD1 Programmed Death 1
- inhibitory molecules examples include PD1, PD-L1, CTLA4, TIM3, CEACAM (e.g., CEACAM-1, CEACAM-3 and/or CEACAM-5) , LAG3, VISTA, BTLA, TIGIT, LAIR1, CD160, 2B4 and TGFR beta.
- Inhibition of a molecule that modulates or regulates, e.g., inhibits, T cell function, e.g., by inhibition at the DNA, RNA or protein level, can optimize a CAR-expressing cell performance. .
- an agent e.g., an inhibitory nucleic acid, e.g., a dsRNA, e.g., an siRNA or shRNA; or e.g., an inhibitory protein or system, e.g., a clustered regularly interspaced short palindromic repeats (CRISPR) , a transcription-activator like effector nuclease (TALEN) , or a zinc finger endonuclease (ZFN) , e.g., as described herein, can be used to inhibit expression of a molecule that modulates or regulates, e.g., inhibits, T-cell function in the CAR-expressing cell.
- the agent is an shRNA.
- the agent that modulates or regulates, e.g., inhibits, T-cell function is inhibited within a CAR-expressing cell.
- a dsRNA molecule that inhibits expression of a molecule that modulates or regulates, e.g., inhibits, T-cell function is linked to the nucleic acid that encodes a component, e.g., all of the components, of the CAR.
- a nucleic acid molecule that encodes a dsRNA molecule that inhibits expression of the molecule that modulates or regulates, e.g., inhibits, T-cell function is operably linked to a promoter, e.g., a H1-or a U6-derived promoter such that the dsRNA molecule that inhibits expression of the molecule that modulates or regulates, e.g., inhibits, T-cell function is expressed, e.g., is expressed within a CAR-expressing cell.
- a promoter e.g., a H1-or a U6-derived promoter
- the dsRNA molecule that inhibits expression of the molecule that modulates or regulates, e.g., inhibits, T-cell function is expressed, e.g., is expressed within a CAR-expressing cell.
- nucleic acid molecule that encodes a dsRNA molecule that inhibits expression of the molecule that modulates or regulates, e.g., inhibits, T-cell function is present on the same vector, e.g., a lentiviral vector, that comprises a nucleic acid molecule that encodes a component, e.g., all of the components, of the CAR.
- the nucleic acid molecule that encodes a dsRNA molecule that inhibits expression of the molecule that modulates or regulates, e.g., inhibits, T-cell function is located on the vector, e.g., the lentiviral vector, 5’ -or 3’ -to the nucleic acid that encodes a component, e.g., all of the components, of the CAR.
- the nucleic acid molecule that encodes a dsRNA molecule that inhibits expression of the molecule that modulates or regulates, e.g., inhibits, T-cell function can be transcribed in the same or different direction as the nucleic acid that encodes a component, e.g., all of the components, of the CAR.
- the nucleic acid molecule that encodes a dsRNA molecule that inhibits expression of the molecule that modulates or regulates, e.g., inhibits, T-cell function is present on a vector other than the vector that comprises a nucleic acid molecule that encodes a component, e.g., all of the components, of the CAR.
- the nucleic acid molecule that encodes a dsRNA molecule that inhibits expression of the molecule that modulates or regulates, e.g., inhibits, T-cell function it transiently expressed within a CAR-expressing cell.
- the nucleic acid molecule that encodes a dsRNA molecule that inhibits expression of the molecule that modulates or regulates, e.g., inhibits, T-cell function is stably integrated into the genome of a CAR-expressing cell.
- Figure 47 depicts examples of vectors for expressing a component, e.g., all of the components, of the CAR with a dsRNA molecule that inhibits expression of the molecule that modulates or regulates, e.g., inhibits, T-cell function.
- dsRNA molecules useful for inhibiting expression of a molecule that modulates or regulates, e.g., inhibits, T-cell function, wherein the molecule that modulates or regulates, e.g., inhibits, T-cell function is PD-1 are provided below.
- PDCD1 RNAi agents
- S sense
- AS antisense
- SEQ ID NOs are indicated in groups of 12 that correspond with “sense 19” SEQ ID NOs: 280- 291; “sense 21” SEQ ID NOs: 292-303; “asense 21” SEQ ID NOs: 304-315; “asense 19” SEQ ID NOs: 316-327.
- PDCD1 PD1
- S sense
- AS antisense
- SEQ ID NOs are indicated in groups of 12 that correspond with “sense 19” SEQ ID NOs: 328-339; “sense 21” SEQ ID NOs: 340-351; “asense 21” SEQ ID NOs: 352-363; “asense 19” SEQ ID NOs: 364-375.
- the inhibitor of an inhibitory signal can be, e.g., an antibody or antibody fragment that binds to an inhibitory molecule.
- the agent can be an antibody or antibody fragment that binds to PD1, PD-L1, PD-L2 or CTLA4 (e.g., ipilimumab (also referred to as MDX-010 and MDX-101, and marketed as Bristol-Myers Squibb; Tremelimumab (IgG2 monoclonal antibody available from Pfizer, formerly known as ticilimumab, CP-675, 206) . ) .
- the agent is an antibody or antibody fragment that binds to TIM3.
- the agent is an antibody or antibody fragment that binds to LAG3.
- PD-1 is an inhibitory member of the CD28 family of receptors that also includes CD28, CTLA-4, ICOS, and BTLA. PD-1 is expressed on activated B cells, T cells and myeloid cells (Agata et al. 1996 Int. Immunol 8: 765-75) . Two ligands for PD-1, PD-L1 and PD-L2 have been shown to downregulate T cell activation upon binding to PD-1 (Freeman et a. 2000 J Exp Med 192: 1027-34; Latchman et al. 2001 Nat Immunol 2: 261-8; Carter et al. 2002 Eur J Immunol 32: 634-43) .
- PD-L1 is abundant in human cancers (Dong et al. 2003 J Mol Med 81: 281-7; Blank et al. 2005 Cancer Immunol. Immunother 54: 307-314; Konishi et al. 2004 Clin Cancer Res 10: 5094) . Immune suppression can be reversed by inhibiting the local interaction of PD-1 with PD-L1. Antibodies, antibody fragments, and other inhibitors of PD-1, PD-L1 and PD-L2 are available in the art and may be used combination with a CAR of the present invention described herein.
- nivolumab also referred to as BMS-936558 or MDX1106; Bristol-Myers Squibb
- BMS-936558 or MDX1106 is a fully human IgG4 monoclonal antibody which specifically blocks PD-1.
- Nivolumab clone 5C4
- Pidilizumab is a humanized IgG1k monoclonal antibody that binds to PD-1.
- Pidilizumab and other humanized anti-PD-1 monoclonal antibodies are disclosed in WO2009/101611.
- Pembrolizumab (formerly known as lambrolizumab, and also referred to as MK03475; Merck) is a humanized IgG4 monoclonal antibody that binds to PD-1. Pembrolizumab and other humanized anti-PD-1 antibodies are disclosed in US 8,354,509 and WO2009/114335.
- MEDI4736 (Medimmune) is a human monoclonal antibody that binds to PDL1, and inhibits interaction of the ligand with PD1.
- MDPL3280A (Genentech /Roche) is a human Fc optimized IgG1 monoclonal antibody that binds to PD-L1.
- MDPL3280A and other human monoclonal antibodies to PD-L1 are disclosed in U.S. Patent No. : 7,943,743 and U. SPublication No. : 20120039906.
- Other anti-PD-L1 binding agents include YW243.55. S70 (heavy and light chain variable regions are shown in SEQ ID NOs 20 and 21 in WO2010/077634) and MDX-1 105 (also referred to as BMS-936559, and, e.g., anti-PD-L1 binding agents disclosed in WO2007/005874) .
- AMP-224 (B7-DCIg; Amplimmune; e.g., disclosed in WO2010/027827 and WO2011/066342) , is a PD-L2 Fc fusion soluble receptor that blocks the interaction between PD-1 and B7-H1.
- Other anti-PD-1 antibodies include AMP 514 (Amplimmune) , among others, e.g., anti-PD-1 antibodies disclosed in US 8,609,089, US 2010028330, and/or US 20120114649.
- TIM3 (T cell immunoglobulin-3) also negatively regulates T cell function, particularly in IFN-g-secreting CD4+T helper 1 and CD8+T cytotoxic 1 cells, and plays a critical role in T cell exhaustion. Inhibition of the interaction between TIM3 and its ligands, e.g., galectin-9 (Gal9) , phosphotidylserine (PS) , and HMGB1, can increase immune response.
- ligands e.g., galectin-9 (Gal9) , phosphotidylserine (PS) , and HMGB1
- Antibodies, antibody fragments, and other inhibitors of TIM3 and its ligands are available in the art and may be used combination with a CD19 CAR described herein.
- antibodies, antibody fragments, small molecules, or peptide inhibitors that target TIM3 binds to the IgV domain of TIM3 to inhibit interaction with its ligands.
- Antibodies and peptides that inhibit TIM3 are disclosed in WO2013/006490 and US20100247521.
- Other anti-TIM3 antibodies include humanized versions of RMT3-23 (disclosed in Ngiow et al., 2011, Cancer Res, 71: 3540-3551) , and clone 8B. 2C12 (disclosed in Monney et al., 2002, Nature, 415: 536-541) .
- Bi-specific antibodies that inhibit TIM3 and PD-1 are disclosed in US20130156774.
- the agent which enhances the activity of a CAR-expressing cell is a CEACAM inhibitor (e.g., CEACAM-1, CEACAM-3, and/or CEACAM-5 inhibitor) .
- the inhibitor of CEACAM is an anti-CEACAM antibody molecule.
- Exemplary anti-CEACAM-1 antibodies are described in WO 2010/125571, WO 2013/082366 WO 2014/059251 and WO 2014/022332, e.g., a monoclonal antibody 34B1, 26H7, and 5F4; or a recombinant form thereof, as described in, e.g., US 2004/0047858, US 7,132,255 and WO 99/052552.
- the anti-CEACAM antibody binds to CEACAM-5 as described in, e.g., Zheng et al. PLoS One. 2010 Sep 2; 5 (9) . pii: e12529 (DOI: 10: 1371/journal. pone. 0021146) , or crossreacts with CEACAM-1 and CEACAM-5 as described in, e.g., WO 2013/054331 and US 2014/0271618.
- carcinoembryonic antigen cell adhesion molecules such as CEACAM-1 and CEACAM-5
- CEACAM-1 and CEACAM-5 are believed to mediate, at least in part, inhibition of an anti-tumor immune response (see e.g., Markel et al. J Immunol. 2002 Mar 15; 168 (6) : 2803-10; Markel et al. J Immunol. 2006 Nov 1; 177 (9) : 6062-71; Markel et al. Immunology. 2009 Feb; 126 (2) : 186-200; Markel et al. Cancer Immunol Immunother. 2010 Feb; 59 (2) : 215-30; Ortenberg et al. Mol Cancer Ther.
- CEACAM-1 has been described as a heterophilic ligand for TIM-3 and as playing a role in TIM-3-mediated T cell tolerance and exhaustion (see e.g., WO 2014/022332; Huang, et al.(2014) Nature doi: 10.1038/nature13848) .
- co-blockade of CEACAM-1 and TIM-3 has been shown to enhance an anti-tumor immune response in xenograft colorectal cancer models (see e.g., WO 2014/022332; Huang, et al. (2014) , supra) .
- co-blockade of CEACAM-1 and PD-1 reduce T cell tolerance as described, e.g., in WO 2014/059251.
- CEACAM inhibitors can be used with the other immunomodulators described herein (e.g., anti-PD-1 and/or anti-TIM-3 inhibitors) to enhance an immune response against a cancer, e.g., a melanoma, a lung cancer (e.g., NSCLC) , a bladder cancer, a colon cancer an ovarian cancer, and other cancers as described herein
- LAG3 lymphocyte activation gene-3 or CD223
- CD223 lymphocyte activation gene-3
- Antibodies, antibody fragments, and other inhibitors of LAG3 and its ligands are available in the art and may be used combination with a CD19 CAR described herein.
- BMS- 986016 Bristol-Myers Squib
- IMP701 is an antagonist LAG3 antibody
- IMP731 is a depleting LAG3 antibody.
- LAG3 inhibitors include IMP321 (Immutep) , which is a recombinant fusion protein of a soluble portion of LAG3 and Ig that binds to MHC class II molecules and activates antigen presenting cells (APC) .
- IMP321 Immutep
- APC antigen presenting cells
- the agent which enhances the activity of a CAR-expressing cell can be, e.g., a fusion protein comprising a first domain and a second domain, wherein the first domain is an inhibitory molecule, or fragment thereof, and the second domain is a polypeptide that is associated with a positive signal, e.g., a polypeptide comrpsing an antracellular signaling domain as described herein.
- the polypeptide that is associated with a positive signal can include a costimulatory domain of CD28, CD27, ICOS, e.g., an intracellular signaling domain of CD28, CD27 and/or ICOS, and/or a primary signaling domain, e.g., of CD3 zeta, e.g., described herein.
- the fusion protein is expressed by the same cell that expressed the CAR. In another embodiment, the fusion protein is expressed by a cell, e.g., a T cell that does not express a mesothelin CAR.
- the agent which enhances activity of a CAR-expressing cell described herein is miR-17-92.
- the cells expressing a CAR molecule are administered in combination with a low, immune enhancing dose of an mTOR inhibitor.
- a dose of an mTOR inhibitor is associated with, or provides, mTOR inhibition of at least 5 but no more than 90%, at least 10 but no more than 90%, at least 15, but no more than 90%, at least 20 but no more than 90%, at least 30 but no more than 90%, at least 40 but no more than 90%, at least 50 but no more than 90%, at least 60 but no more than 90%, or at least 70 but no more than 90%.
- a dose of an mTOR inhibitor is associated with, or provides, mTOR inhibition of at least 5 but no more than 80%, at least 10 but no more than 80%, at least 15, but no more than 80%, at least 20 but no more than 80%, at least 30 but no more than 80%, at least 40 but no more than 80%, at least 50 but no more than 80%, or at least 60 but no more than 80%.
- a dose of an mTOR inhibitor is associated with, or provides, mTOR inhibition of at least 5 but no more than 70%, at least 10 but no more than 70%, at least 15, but no more than 70%, at least 20 but no more than 70%, at least 30 but no more than 70%, at least 40 but no more than 70%, or at least 50 but no more than 70%.
- a dose of an mTOR inhibitor is associated with, or provides, mTOR inhibition of at least 5 but no more than 60%, at least 10 but no more than 60%, at least 15, but no more than 60%, at least 20 but no more than 60%, at least 30 but no more than 60%, or at least 40 but no more than 60%.
- a dose of an mTOR inhibitor is associated with, or provides, mTOR inhibition of at least 5 but no more than 50%, at least 10 but no more than 50%, at least 15, but no more than 50%, at least 20 but no more than 50%, at least 30 but no more than 50%, or at least 40 but no more than 50%.
- a dose of an mTOR inhibitor is associated with, or provides, mTOR inhibition of at least 5 but no more than 40%, at least 10 but no more than 40%, at least 15, but no more than 40%, at least 20 but no more than 40%, at least 30 but no more than 40%, or at least 35 but no more than 40%.
- a dose of an mTOR inhibitor is associated with, or provides, mTOR inhibition of at least 5 but no more than 30%, at least 10 but no more than 30%, at least 15, but no more than 30%, at least 20 but no more than 30%, or at least 25 but no more than 30%.
- a dose of an mTOR inhibitor is associated with, or provides, mTOR inhibition of at least 1, 2, 3, 4 or 5 but no more than 20%, at least 1, 2, 3, 4 or 5 but no more than 30%, at least 1, 2, 3, 4 or 5, but no more than 35, at least 1, 2, 3, 4 or 5 but no more than 40%, or at least 1, 2, 3, 4 or 5 but no more than 45%.
- a dose of an mTOR inhibitor is associated with, or provides, mTOR inhibition of at least 1, 2, 3, 4 or 5 but no more than 90%.
- the extent of mTOR inhibition can be expressed as the extent of P70 S6 inhibition, e.g., the extent of mTOR inhibition can be determined by the level of decrease in P70 S6 activity, e.g., by the decrease in phosphorylation of a P70 S6 substrate.
- the level of mTOR inhibition can be evaluated by a method described herein, e.g. by the Boulay assay.
- mTOR inhibitor refers to a compound or ligand, or a pharmaceutically acceptable salt thereof, which inhibits the mTOR kinase in a cell.
- an mTOR inhibitor is an allosteric inhibitor.
- an mTOR inhibitor is a catalytic inhibitor.
- Allosteric mTOR inhibitors include the neutral tricyclic compound rapamycin (sirolimus) , rapamycin-related compounds, that is compounds having structural and functional similarity to rapamycin including, e.g., rapamycin derivatives, rapamycin analogs (also referred to as rapalogs) and other macrolide compounds that inhibit mTOR activity.
- rapamycin neutral tricyclic compound
- rapamycin-related compounds that is compounds having structural and functional similarity to rapamycin including, e.g., rapamycin derivatives, rapamycin analogs (also referred to as rapalogs) and other macrolide compounds that inhibit mTOR activity.
- Rapamycin is a known macrolide antibiotic produced by Streptomyces hygroscopicus having the structure shown in Formula A.
- Rapamycin analogs useful in the invention are, for example, O-substituted analogs in which the hydroxyl group on the cyclohexyl ring of rapamycin is replaced by OR 1 in which R 1 is hydroxyalkyl, hydroxyalkoxyalkyl, acylaminoalkyl, or aminoalkyl; e.g. RAD001, also known as, everolimus as described in US 5,665,772 and WO94/09010 the contents of which are incorporated by reference.
- Other suitable rapamycin analogs include those substituted at the 26-or 28-position.
- the rapamycin analog may be an epimer of an analog mentioned above, particularly an epimer of an analog substituted in position 40, 28 or 26, and may optionally be further hydrogenated, e.g. as described in US 6,015,815, WO95/14023 and WO99/15530 the contents of which are incorporated by reference, e.g. ABT578 also known as zotarolimus or a rapamycin analog described in US 7, 091, 213, WO98/02441 and WO01/14387 the contents of which are incorporated by reference, e.g. AP23573 also known as ridaforolimus.
- rapamycin analogs suitable for use in the present invention from US 5,665,772 include, but are not limited to, 40-O-benzyl-rapamycin, 40-O- (4’ -hydroxymethyl) benzyl-rapamycin, 40-O- [4’ - (1, 2-dihydroxyethyl) ] benzyl-rapamycin, 40-O-allyl-rapamycin, 40-O- [3’ - (2, 2-dimethyl-1, 3-dioxolan-4 (S) -yl) -prop-2’ -en-1’ -yl] -rapamycin, (2’E, 4’S) -40-O- (4’ , 5’ -dihydroxypent-2’ -en-1’ -yl) -rapamycin, 40-O- (2-hydroxy) ethoxycarbonylmethyl-rapamycin, 40-O- (2-hydroxy) ethyl-rapamycin , 40-O- (3-hydroxy) propyl-rap
- rapamycin analogs useful in the present invention are analogs where the hydroxyl group on the cyclohexyl ring of rapamycin and/or the hydroxy group at the 28 position is replaced with an hydroxyester group are known, for example, rapamycin analogs found in US RE44,768, e.g. temsirolimus.
- rapamycin analogs useful in the preset invention include those wherein the methoxy group at the 16 position is replaced with another substituent, preferably (optionally hydroxy-substituted) alkynyloxy, benzyl, orthomethoxybenzyl or chlorobenzyl and/or wherein the mexthoxy group at the 39 position is deleted together with the 39 carbon so that the cyclohexyl ring of rapamycin becomes a cyclopentyl ring lacking the 39 position methyoxy group; e.g. as described in WO95/16691 and WO96/41807 the contents of which are incorporated by reference.
- the analogs can be further modified such that the hydroxy at the 40-position of rapamycin is alkylated and/or the 32-carbonyl is reduced.
- Rapamycin analogs from WO95/16691 include, but are not limited to, 16-demthoxy-16- (pent-2-ynyl) oxy-rapamycin, 16-demthoxy-16- (but-2-ynyl) oxy-rapamycin, 16-demthoxy-16- (propargyl) oxy-rapamycin, 16-demethoxy-16- (4-hydroxy-but-2-ynyl) oxy-rapamycin, 16-demthoxy-16-benzyloxy-40-O- (2-hydroxyethyl) -rapamycin, 16-demthoxy-16-benzyloxy-rapamycin, 16-demethoxy-16-ortho-methoxybenzyl-rapamycin, 16-demethoxy-40-O- (2-methoxyethyl) -16-pent-2-ynyl) oxy-rapamycin, 39-demethoxy-40-desoxy-39-formyl-42-nor-rapamycin, 39-demethoxy-40
- Rapamycin analogs from WO96/41807 include, but are not limited to, 32-deoxo-rapamycin, 16-O-pent-2-ynyl-32-deoxo-rapamycin, 16-O-pent-2-ynyl-32-deoxo-40-O- (2-hydroxy-ethyl) -rapamycin, 16-O-pent-2-ynyl-32- (S) -dihydro-40-O- (2-hydroxyethyl) - rapamycin, 32 (S) -dihydro-40-O- (2-methoxy) ethyl-rapamycin and 32 (S) -dihydro-40-O- (2-hydroxyethyl) -rapamycin.
- rapamycin analog is umirolimus as described in US2005/0101624 the contents of which are incorporated by reference.
- RAD001 otherwise known as everolimus has the chemical name (1R, 9S, 12S, 15R, 16E, 18R, 19R, 21R, 23S, 24E, 26E, 28E, 30S, 32S, 35R) -1, 18-dihydroxy-12- ⁇ (1R) -2- [ (1S, 3R, 4R) -4- (2-hydroxyethoxy) -3-methoxycyclohexyl] -1-methylethyl ⁇ -19, 30-dimethoxy-15, 17, 21, 23, 29, 35-hexamethyl-11, 36-dioxa-4-aza-tricyclo [30.3.1.04, 9] hexatriaconta-16, 24, 26, 28-tetraene-2, 3, 10, 14, 20-pentaone
- allosteric mTOR inhibitors include sirolimus (rapamycin, AY-22989) , 40- [3-hydroxy-2- (hydroxymethyl) -2-methylpropanoate] -rapamycin (also called temsirolimus or CCI-779) and ridaforolimus (AP-23573/MK-8669) .
- Other examples of allosteric mTor inhibtors include zotarolimus (ABT578) and umirolimus.
- catalytic, ATP-competitive mTOR inhibitors have been found to target the mTOR kinase domain directly and target both mTORC1 and mTORC2. These are also more effective inhibitors of mTORC1 than such allosteric mTOR inhibitors as rapamycin, because they modulate rapamycin-resistant mTORC1 outputs such as 4EBP1-T37/46 phosphorylation and cap-dependent translation.
- Catalytic inhibitors include: BEZ235 or 2-methyl-2- [4- (3-methyl-2-oxo-8-quinolin-3-yl-2, 3-dihydro-imidazo [4, 5-c] quinolin-1-yl) -phenyl] -propionitrile, or the monotosylate salt form.
- catalytic mTOR inhibitors include 8- (6-methoxy-pyridin-3-yl) -3-methyl-1- (4-piperazin-1-yl-3-trifluoromethyl-phenyl) -1, 3-dihydro-imidazo [4, 5-c] quinolin-2-one (WO2006/122806) and Ku-0063794 (Garcia-Martinez JM, et al., Biochem J., 2009, 421 (1) , 29-42.. Ku-0063794 is a specific inhibitor of the mammalian target of rapamycin (mTOR) .
- WYE-354 is another example of a catalytic mTor inhibitor (Yu K, et al. (2009) . Biochemical, Cellular, and In vivo Activity of Novel ATP-Competitive and Selective Inhibitors of the Mammalian Target of Rapamycin. Cancer Res. 69 (15) : 6232-6240) .
- mTOR inhibitors useful according to the present invention also include prodrugs, derivatives, pharmaceutically acceptable salts, or analogs thereof of any of the foregoing.
- mTOR inhibitors such as RAD001
- RAD001 may be formulated for delivery based on well-established methods in the art based on the particular dosages described herein.
- US Patent 6,004,973 (incorporated herein by reference) provides examples of formulations useable with the mTOR inhibitors described herein.
- mTOR phosphorylates the kinase P70 S6, thereby activating P70 S6 kinase and allowing it to phosphorylate its substrate.
- the extent of mTOR inhibition can be expressed as the extent of P70 S6 kinase inhibition, e.g., the extent of mTOR inhibition can be determined by the level of decrease in P70 S6 kinase activity, e.g., by the decrease in phosphorylation of a P70 S6 kinase substrate.
- the level of inhibition of P70 S6 kinase gives the level of mTOR inhibition.
- mTOR activity as measured by P70 S6 kinase activity, is inhibited by 40%.
- the extent or level of inhibition referred to herein is the average level of inhibition over the dosage interval. By way of example, if the inhibitor is given once per week, the level of inhibition is given by the average level of inhibition over that interval, namely a week.
- Boulay et al., Cancer Res, 2004, 64: 252-61, hereby incorporated by reference, teaches an assay that can be used to assess the level of mTOR inhibition (referred to herein as the Boulay assay) .
- the assay relies on the measurement of P70 S6 kinase activity from biological samples before and after administration of an mTOR inhibitor, e.g., RAD001. Samples can be taken at preselected times after treatment with an mTOR ihibitor, e.g., 24, 48, and 72 hours after treatment. Biological samples, e.g., from skin or peripheral blood mononuclear cells (PBMCs) can be used. Total protein extracts are prepared from the samples.
- PBMCs peripheral blood mononuclear cells
- P70 S6 kinase is isolated from the protein extracts by immunoprecipitation using an antibody that specifically recognizes the P70 S6 kinase.
- Activity of the isolated P70 S6 kinase can be measured in an in vitro kinase assay.
- the isolated kinase can be incubated with 40S ribosomal subunit substrates (which is an endogenous substrate of P70 S6 kinase) and gamma- 32 P under conditions that allow phosphorylation of the substrate. Then the reaction mixture can be resolved on an SDS-PAGE gel, and 32 P signal analyzed using a PhosphorImager.
- a 32 P signal corresponding to the size of the 40S ribosomal subunit indicates phosphorylated substrate and the activity of P70 S6 kinase.
- Increases and decreases in kinase activity can be calculated by quantifying the area and intensity of the 32 P signal of the phosphorylated substrate (e.g., using ImageQuant, Molecular Dynamics) , assigning arbitrary unit values to the quantified signal, and comparing the values from after administration with values from before administration or with a reference value.
- percent inhibition of kinase activity can be calculated with the following formula: 1- (value obtained after administration/value obtained before administration) X 100.
- the extent or level of inhibition referred to herein is the average level of inhibition over the dosage interval.
- the level of mTOR inhibition can also be evaluated by a change in the ration of PD1 negative to PD1 positive T cells.
- T cells from peripheral blood can be identified as PD1 negative or positive by art-known methods.
- Methods described herein use low, immune enhancing, dose mTOR inhibitors, doses of mTOR inhibitors, e.g., allosteric mTOR inhibitors, including rapalogs such as RAD001.
- doses of mTOR inhibitors e.g., allosteric mTOR inhibitors, including rapalogs such as RAD001.
- levels of inhibitor that fully or near fully inhibit the mTOR pathway are immunosuppressive and are used, e.g., to prevent organ transplant rejection.
- high doses of rapalogs that fully inhibit mTOR also inhibit tumor cell growth and are used to treat a variety of cancers (See, e.g., Antineoplastic effects of mammalian target of rapamycine inhibitors. Salvadori M. World J Transplant.
- the present invention is based, at least in part, on the surprising finding that doses of mTOR inhibitors well below those used in current clinical settings had a superior effect in increasing an immune response in a subject and increasing the ratio of PD-1 negative T cells/PD-1 positive T cells. It was surprising that low doses of mTOR inhibitors, producing only partial inhibition of mTOR activity, were able to effectively improve immune responses in human subjects and increase the ratio of PD-1 negative T cells/PD-1 positive T cells.
- low, a low, immune enhancing, dose of an mTOR inhibitor can increase naive T cell numbers, e.g., at least transiently, e.g., as compared to a non-treated subject.
- treatment with an mTOR inhibitor after a sufficient amount of time or sufficient dosing results in one or more of the following:
- CD62L high CD127 high , CD27 + , and BCL2
- memory T cells e.g., memory T cell precursors
- KLRG1 a decrease in the expression of KLRG1, e.g., on memory T cells, e.g., memory T cell precursors;
- an increase in the number of memory T cell precursors e.g., cells with any one or combination of the following characteristics: increased CD62L high , increased CD127 high , increased CD27 + , decreased KLRG1, and increased BCL2;
- Memory T cell precursors are memory T cells that are early in the differentiation program.
- memory T cells have one or more of the following characteristics: increased CD62L high , increased CD127 high , increased CD27 + , decreased KLRG1, and/or increased BCL2.
- the invention relates to a composition, or dosage form, of an mTOR inhibitor, e.g., an allosteric mTOR inhibitor, e.g., a rapalog, rapamycin, or RAD001, or a catalytic mTOR inhibitor, which, when administered on a selected dosing regimen, e.g., once daily or once weekly, is associated with: a level of mTOR inhibition that is not associated with complete, or significant immune suppression, but is associated with enhancement of the immune response.
- an mTOR inhibitor e.g., an allosteric mTOR inhibitor, e.g., a rapalog, rapamycin, or RAD001
- a catalytic mTOR inhibitor which, when administered on a selected dosing regimen, e.g., once daily or once weekly, is associated with: a level of mTOR inhibition that is not associated with complete, or significant immune suppression, but is associated with enhancement of the immune response.
- An mTOR inhibitor e.g., an allosteric mTOR inhibitor, e.g., a rapalog, rapamycin, or RAD001, or a catalytic mTOR inhibitor
- a sustained release formulation will have lower bioavailability than an immediate release formulation.
- a sustained release formulation will have from about 2 to about 5, about 2.5 to about 3.5, or about 3 times the amount of inhibitor provided in the immediate release formulation.
- immediate release forms e.g., of RAD001, typically used for one administration per week, having 0.1 to 20, 0.5 to 10, 2.5 to 7.5, 3 to 6, or about 5, mgs per unit dosage form.
- these immediate release formulations correspond to sustained release forms, having, respectively, 0.3 to 60, 1.5 to 30, 7.5 to 22.5, 9 to 18, or about 15 mgs of an mTOR inhibitor, e.g., an allosteric mTOR inhibitor, e.g., rapamycin or RAD001.
- both forms are administered on a once/week basis.
- immediate release forms e.g., of RAD001, typically used for one administration per day, having having 0.005 to 1.5, 0.01 to 1.5, 0.1 to 1.5, 0.2 to 1.5, 0.3 to 1.5, 0.4 to 1.5, 0.5 to 1.5, 0.6 to 1.5, 0.7 to 1.5, 0.8 to 1.5, 1.0 to 1.5, 0.3 to 0.6, or about 0.5 mgs per unit dosage form, are provided.
- these immediate release forms correspond to sustained release forms, having, respectively, 0.015 to 4.5, 0.03 to 4.5, 0.3 to 4.5, 0.6 to 4.5, 0.9 to 4.5, 1.2 to 4.5, 1.5 to 4.5, 1.8 to 4.5, 2.1 to 4.5, 2.4 to 4.5, 3.0 to 4.5, 0.9 to 1.8, or about 1.5 mgs of an mTOR inhibitor, e.g., an allosteric mTOR inhibitor, e.g., rapamycin or RAD001.
- an mTOR inhibitor e.g., an allosteric mTOR inhibitor, e.g., rapamycin or RAD001.
- these immediate release forms correspond to sustained release forms, having, respectively, 0.1 to 30, 0.2 to 30, 2 to 30, 4 to 30, 6 to 30, 8 to 30, 10 to 30, 1.2 to 30, 14 to 30, 16 to 30, 20 to 30, 6 to 12, or about 10 mgs of an mTOR inhibitor, e.g., an allosteric mTOR inhibitor, e.g., rapamycin or RAD001.
- an mTOR inhibitor e.g., an allosteric mTOR inhibitor, e.g., rapamycin or RAD001.
- immediate release forms e.g., of RAD001, typically used for one administration per day, having having 0.01 to 1.0 mgs per unit dosage form.
- these immediate release forms correspond to sustained release forms, having, respectively, 0.03 to 3 mgs of an mTOR inhibitor, e.g., an allosteric mTOR inhibitor, e.g., rapamycin or RAD001.
- these immediate release forms correspond to sustained release forms, having, respectively, 0.2 to 20 mgs of an mTOR inhibitor, e.g., an allosteric mTOR inhibitor, e.g., rapamycin or RAD001.
- immediate release forms e.g., of RAD001, typically used for one administration per week, having having 0.5 to 5.0 mgs per unit dosage form, are provided.
- these immediate release forms correspond to sustained release forms, having, respectively, 1.5 to 15 mgs of an mTOR inhibitor, e.g., an allosteric mTOR inhibitor, e.g., rapamycin or RAD001.
- an mTOR inhibitor e.g., an allosteric mTOR inhibitor, e.g., rapamycin or RAD001.
- one target of the mTOR pathway is the P70 S6 kinase.
- doses of mTOR inhibitors which are useful in the methods and compositions described herein are those which are sufficient to achieve no greater than 80%inhibition of P70 S6 kinase activity relative to the activity of the P70 S6 kinase in the absence of an mTOR inhibitor, e.g., as measured by an assay described herein, e.g., the Boulay assay.
- the invention provides an amount of an mTOR inhibitor sufficient to achieve no greater than 38%inhibition of P70 S6 kinase activity relative to P70 S6 kinase activity in the absence of an mTOR inhibitor.
- the dose of mTOR inhibitor useful in the methods and compositions of the invention is sufficient to achieve, e.g., when administered to a human subject, 90 +/-5 % (i.e., 85-95%) , 89+/-5 %, 88+/-5 %, 87+/-5 %, 86+/-5 %, 85+/-5 %, 84+/-5 %, 83+/-5 %, 82+/-5 %, 81+/-5 %, 80+/-5 %, 79+/-5 %, 78+/-5 %, 77+/-5 %, 76+/-5 %, 75+/-5 %, 74+/-5 %, 73+/-5 %, 72 +/-5%, 71 +/-5%, 70 +/-5%, 69 +/-5%, 68 +/-5%, 67 +/-5%, 66 +/-5%, 65 +/-5%, 64 +/-5%, 63 +/-5%,
- P70 S6 kinase activity in a subject may be measured using methods known in the art, such as, for example, according to the methods described in U.S. Pat. 7,727,950, by immunoblot analysis of phosphoP70 S6K levels and/or phosphoP70 S6 levels or by in vitro kinase activity assays.
- the term “about” in reference to a dose of mTOR inhibitor refers to up to a +/-10%variability in the amount of mTOR inhibitor, but can include no variability around the stated dose.
- the invention provides methods comprising administering to a subject an mTOR inhibitor, e.g., an allosteric inhibitor, e.g., RAD001, at a dosage within a target trough level.
- an mTOR inhibitor e.g., an allosteric inhibitor, e.g., RAD001
- the trough level is significantly lower than trough levels associated with dosing regimens used in organ transplant and cancer patients.
- mTOR inhibitor e.g., RAD001, or rapamycin
- mTOR inhibitor e.g., RAD001, or rapamycin
- a trough level that is less than 1/2, 1/4, 1/10, or 1/20 of the trough level provided on the FDA approved packaging insert for use in immunosuppression or an anticancer indications.
- a method disclosed herein comprises administering to a subject an mTOR inhibitor, e.g., an allosteric inhibitor, e.g., RAD001, at a dosage that provides a target trough level of 0.1 to 10 ng/ml, 0.1 t0 5 ng/ml, 0.1 to 3ng/ml, 0.1 to 2 ng/ml, or 0.1 to 1 ng/ml.
- an mTOR inhibitor e.g., an allosteric inhibitor, e.g., RAD001
- a method disclosed herein comprises administering to a subject an mTOR inhibitor, e.g., an allosteric inhibitor, e.g., RAD001, at a dosage that provides a target trough level of 0.2 to 10 ng/ml, 0.2 to 5 ng/ml, 0.2 to 3ng/ml, 0.2 to 2 ng/ml, or 0.2 to 1 ng/ml.
- an mTOR inhibitor e.g., an allosteric inhibitor, e.g., RAD001
- a method disclosed herein comprises administering to a subject an mTOR inhibitor, e.g.an, allosteric inhibitor, e.g., RAD001, at a dosage that provides a target trough level of 0.3 to 10 ng/ml, 0.3 to 5 ng/ml, 0.3 to 3ng/ml, 0.3 to 2 ng/ml, or 0.3 to 1 ng/ml.
- an mTOR inhibitor e.g.an, allosteric inhibitor, e.g., RAD001
- a method disclosed herein comprises administering to a subject an mTOR inhibitor, e.g., an allosteric inhibitor, e.g., RAD001, at a dosage that provides a target trough level of 0.4 to 10 ng/ml, 0.4 to 5 ng/ml, 0.4 to 3ng/ml, 0.4 to 2 ng/ml, or 0.4 to 1 ng/ml.
- an mTOR inhibitor e.g., an allosteric inhibitor, e.g., RAD001
- a method disclosed herein comprises administering to a subject an mTOR inhibitor, e.g., an allosteric inhibitor, e.g., RAD001, at a dosage that provides a target trough level of 0.5 to 10 ng/ml, 0.5 to 5 ng/ml, 0.5 to 3ng/ml, 0.5 to 2 ng/ml, or 0.5 to 1 ng/ml.
- an mTOR inhibitor e.g., an allosteric inhibitor, e.g., RAD001
- a method disclosed herein comprises administering to a subject an mTOR inhibitor, e.g., an allosteric inhibitor, e.g., RAD001, at a dosage that provides a target trough level of 1 to 10 ng/ml, 1 to 5 ng/ml, 1 to 3ng/ml, or 1 to 2 ng/ml.
- an mTOR inhibitor e.g., an allosteric inhibitor, e.g., RAD001
- trough level refers to the concentration of a drug in plasma just before the next dose, or the minimum drug conce ntration between two doses.
- a target trough level of RAD001 is in a range of between about 0.1 and 4.9 ng/ml. In an embodiment, the target trough level is below 3ng/ml, e.g., is between 0.3 or less and 3 ng/ml. In an embodiment, the target trough level is below 3ng/ml, e.g., is between 0.3 or less and 1 ng/ml.
- the invention can utilize an mTOR inhibitor other than RAD001 in an amount that is associated with a target trough level that is bioequivalent to the specified target trough level for RAD001.
- the target trough level for an mTOR inhibitor other than RAD001 is a level that gives the same level of mTOR inhibition (e.g., as measured by a method described herein, e.g., the inhibition of P70 S6) as does a trough level of RAD001 described herein.
- compositions mTOR Inhibitors
- the present invention relates to pharmaceutical compositions comprising an mTOR inhibitor, e.g., an mTOR inhibitor as described herein, formulated for use in combination with CAR cells described herein.
- an mTOR inhibitor e.g., an mTOR inhibitor as described herein
- the mTOR inhibitor is formulated for administration in combination with an additional, e.g., as described herein.
- compounds of the invention will be administered in therapeutically effective amounts as described above via any of the usual and acceptable modes known in the art, either singly or in combination with one or more therapeutic agents.
- the pharmaceutical formulations may be prepared using conventional dissolution and mixing procedures.
- the bulk drug substance e.g., an mTOR inhibitor or stabilized form of the compound (e.g., complex with a cyclodextrin derivative or other known complexation agent) is dissolved in a suitable solvent in the presence of one or more of the excipients described herein.
- the mTOR inhibitor is typically formulated into pharmaceutical dosage forms to provide an easily controllable dosage of the drug and to give the patient an elegant and easily handleable product.
- Compounds of the invention can be administered as pharmaceutical compositions by any conventional route, in particular enterally, e.g., orally, e.g., in the form of tablets or capsules, or parenterally, e.g., in the form of injectable solutions or suspensions, topically, e.g., in the form of lotions, gels, ointments or creams, or in a nasal or suppository form.
- an mTOR inhibitor is administered in combination with (either simultaneously with or separately from) another agent as described herein, in one aspect, both components can be administered by the same route (e.g., parenterally) .
- another agent may be administered by a different route relative to the mTOR inhibitor.
- an mTOR inhibitor may be administered orally and the other agent may be administered parenterally.
- mTOR inhibitors e.g., allosteric mTOR inhibitors or catalytic mTOR inhibitors, disclosed herein can be provided as pharmaceutical formulations in form of oral solid dosage forms comprising an mTOR inhibitor disclosed herein, e.g., rapamycin or RAD001, which satisfy product stability requirements and/or have favorable pharmacokinetic properties over the immediate release (IR) tablets, such as reduced average plasma peak concentrations, reduced inter-and intra-patient variability in the extent of drug absorption and in the plasma peak concentration, reduced C max /C min ratio and/or reduced food effects.
- IR immediate release
- Provided pharmaceutical formulations may allow for more precise dose adjustment and/or reduce frequency of adverse events thus providing safer treatments for patients with an mTOR inhibitor disclosed herein, e.g., rapamycin or RAD001.
- the present disclosure provides stable extended release formulations of an mTOR inhibitor disclosed herein, e.g., rapamycin or RAD001, which are multi-particulate systems and may have functional layers and coatings.
- an mTOR inhibitor disclosed herein e.g., rapamycin or RAD001
- rapamycin or RAD001 which are multi-particulate systems and may have functional layers and coatings.
- extended release, multi-particulate formulation refers to a formulation which enables release of an mTOR inhibitor disclosed herein, e.g., rapamycin or RAD001, over an extended period of time e.g. over at least 1, 2, 3, 4, 5 or 6 hours.
- the extended release formulation may contain matrices and coatings made of special excipients, e.g., as described herein, which are formulated in a manner as to make the active ingredient available over an extended period of time following ingestion.
- extended release can be interchangeably used with the terms “sustained release” (SR) or “prolonged release” .
- extended release relates to a pharmaceutical formulation that does not release active drug substance immediately after oral dosing but over an extended in accordance with the definition in the pharmacopoeias Ph. Eur. (7 th edition) mongraph for tablets and capsules and USP general chapter ⁇ 1151> for pharmaceutical dosage forms.
- the term “Immediate Release” (IR) as used herein refers to a pharmaceutical formulation which releases 85% of the active drug substance within less than 60 minutes in accordance with the definition of “Guidance for Industry: “Dissolution Testing of Immediate Release Solid Oral Dosage Forms” (FDA CDER, 1997) .
- immediate release means release of everolismus from tablets within the time of 30 minutes, e.g., as measured in the dissolution assay described herein.
- Stable extended release formulations of an mTOR inhibitor disclosed herein can be characterized by an in-vitro release profile using assays known in the art, such as a dissolution assay as described herein: a dissolution vessel filled with 900 mL phosphate buffer pH 6.8 containing sodium dodecyl sulfate 0.2% at 37°C and the dissolution is performed using a paddle method at 75 rpm according to USP by according to USP testing monograph 711, and Ph. Eur. testing monograph 2.9.3. respectively.
- assays known in the art such as a dissolution assay as described herein: a dissolution vessel filled with 900 mL phosphate buffer pH 6.8 containing sodium dodecyl sulfate 0.2% at 37°C and the dissolution is performed using a paddle method at 75 rpm according to USP by according to USP testing monograph 711, and Ph. Eur. testing monograph 2.9.3. respectively.
- 3h >60%, or >65%, e.g., >85%, e.g., >90%.
- stable extended release formulations of an mTOR inhibitor disclosed herein e.g., rapamycin or RAD001, release 50% of the mTOR inhibitor not earlier than 45, 60, 75, 90, 105 min or 120 min in the in-vitro dissolution assay.
- compositions of the present invention may comprise a CAR-expressing cell, e.g., a plurality of CAR-expressing cells, as described herein, in combination with one or more pharmaceutically or physiologically acceptable carriers, diluents or excipients.
- Such compositions may comprise buffers such as neutral buffered saline, phosphate buffered saline and the like; carbohydrates such as glucose, mannose, sucrose or dextrans, mannitol; proteins; polypeptides or amino acids such as glycine; antioxidants; chelating agents such as EDTA or glutathione; adjuvants (e.g., aluminum hydroxide) ; and preservatives.
- Compositions of the present invention are in one aspect formulated for intravenous administration.
- compositions of the present invention may be administered in a manner appropriate to the disease to be treated (or prevented) .
- the quantity and frequency of administration will be determined by such factors as the condition of the patient, and the type and severity of the patient’s disease, although appropriate dosages may be determined by clinical trials.
- the pharmaceutical composition is substantially free of, e.g., there are no detectable levels of a contaminant, e.g., selected from the group consisting of endotoxin, mycoplasma, replication competent lentivirus (RCL) , p24, VSV-G nucleic acid, HIV gag, residual anti-CD3/anti-CD28 coated beads, mouse antibodies, pooled human serum, bovine serum albumin, bovine serum, culture media components, vector packaging cell or plasmid components, a bacterium and a fungus.
- a contaminant e.g., selected from the group consisting of endotoxin, mycoplasma, replication competent lentivirus (RCL) , p24, VSV-G nucleic acid, HIV gag, residual anti-CD3/anti-CD28 coated beads, mouse antibodies, pooled human serum, bovine serum albumin, bovine serum, culture media components, vector packaging cell or plasmid components, a bacterium and a fungus.
- the bacterium is at least one selected from the group consisting of Alcaligenes faecalis, Candida albicans, Escherichia coli, Haemophilus influenza, Neisseria meningitides, Pseudomonas aeruginosa, Staphylococcus aureus, Streptococcus pneumonia, and Streptococcus pyogenes group A.
- an immunologically effective amount, ” “an anti-cancer effective amount, ” “a cancer-inhibiting effective amount, ” or “therapeutic amount” is indicated, the precise amount of the compositions of the present invention to be administered can be determined by a physician with consideration of individual differences in age, weight, tumor size, extent of infection or metastasis, and condition of the patient (subject) . It can generally be stated that a pharmaceutical composition comprising the immune effector cells described herein may be administered at a dosage of 10 4 to 10 9 cells/kg body weight, in some instances 10 5 to 10 6 cells/kg body weight, including all integer values within those ranges. The immune effector cell compositions may also be administered multiple times at these dosages. The cells can be administered by using infusion techniques that are commonly known in immunotherapy (see, e.g., Rosenberg et al., New Eng. J. of Med. 319: 1676, 1988) .
- the cells can be activated from blood draws of from 10cc to 400cc.
- the cells are activated from blood draws of 20cc, 30cc, 40cc, 50cc, 60cc, 70cc, 80cc, 90cc, or 100cc.
- compositions described herein may be administered to a patient trans arterially, subcutaneously, intradermally, intratumorally, intranodally, intramedullary, intramuscularly, by intravenous (i.v. ) injection, or intraperitoneally.
- the T cell compositions of the present invention are administered to a patient by intradermal or subcutaneous injection.
- the immune effector cell compositions of the present invention are administered by i.v. injection.
- the compositions of immune effector cells may be injected directly into a tumor, lymph node, or site of infection.
- subjects may undergo leukapheresis, wherein leukocytes are collected, enriched, or depleted ex vivo to select and/or isolate the cells of interest, e.g., T cells.
- T cell isolates may be expanded by methods known in the art and treated such that one or more CAR constructs of the invention may be introduced, thereby creating a CAR T cell of the invention.
- Subjects in need thereof may subsequently undergo standard treatment with high dose chemotherapy followed by peripheral blood stem cell transplantation.
- subjects receive an infusion of the expanded CAR T cells of the present invention.
- expanded cells are administered before or following surgery.
- the dosage of the above treatments to be administered to a patient will vary with the precise nature of the condition being treated and the recipient of the treatment.
- the scaling of dosages for human administration can be performed according to art-accepted practices.
- the dose for CAMPATH for example, will generally be in the range 1 to about 100 mg for an adult patient, usually administered daily for a period between 1 and 30 days.
- the preferred daily dose is 1 to 10 mg per day although in some instances larger doses of up to 40 mg per day may be used (described in U.S. Patent No. 6, 120, 766) .
- the CAR is introduced into immune effector cells, e.g., using in vitro transcription, and the subject (e.g., human) receives an initial administration of CAR-expressingcells of the invention, and one or more subsequent administrations of the CAR-expressing cells of the invention, wherein the one or more subsequent administrations are administered less than 15 days, e.g., 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, or 2 days after the previous administration.
- more than one administration of the CAR-expressing cells of the invention are administered to the subject (e.g., human) per week, e.g., 2, 3, or 4 administrations of the CAR-expressing cells of the invention are administered per week.
- the subject receives more than one administration of the CAR-expressing cells per week (e.g., 2, 3 or 4 administrations per week) (also referred to herein as a cycle) , followed by a week of no CAR-expressing cells administration, and then one or more additional administration of the CAR-expressing cells (e.g., more than one administration of the CAR-expressing cells per week) is administered to the subject.
- the subject receives more than one cycle of CAR-expressing cells, and the time between each cycle is less than 10, 9, 8, 7, 6, 5, 4, or 3 days.
- the CAR-expressing cells are administered every other day for 3 administrations per week.
- the CAR-expressing cells of the invention are administered for at least two, three, four, five, six, seven, eight or more weeks.
- mesothelin CAR-expressing cells are generated using lentiviral viral vectors, such as lentivirus. CAR-expressing cells generated that way will have stable CAR expression.
- the CAR-expressing cellss transiently express CAR vectors for 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 days after transduction.
- Transient expression of CARs can be effected by RNA CAR vector delivery.
- the CAR RNA is transduced into the T cell by electroporation.
- the dose and/or dosing schedule is one provided in Figure 6.
- a potential issue that can arise in patients being treated using transiently expressing CAR-expressing cells is anaphylaxis after multiple treatments.
- anaphylactic response might be caused by a patient developing humoral anti-CAR response, i.e., anti-CAR antibodies having an anti-IgE isotype. It is thought that a patient’s antibody producing cells undergo a class switch from IgG isotype (that does not cause anaphylaxis) to IgE isotype when there is a ten to fourteen day break in exposure to antigen.
- CAR-expressing cell infusion breaks should not last more than ten to fourteen days.
- CARs with human (instead of murine) scFvs can reduce the likelihood and intensity of a patient having an anti-CAR response.
- Table 2 Amino Acid Sequences of Human scFvs and CARs (bold underline is the leader sequence and grey box is a linker sequence) .
- the remaining amino acids are the heavy chain variable region and light chain variable regions, with each of the HC CDRs (HC CDR1, HC CDR2, HC CDR3) and LC CDRs (LC CDR1, LC CDR2, LCCDR3) underlined) .
- the further remaining amino acids are the remaining amino acids of the CARs.
- ScFv to be used in the final CAR construct were derived from the pannings of human scFV libraries.
- the amino acid sequences of the human scFv fragments are provided above in Table 2 and the nucleic acid sequences of the human scFv fragments are provided above in Table 3.
- Full CAR constructs were generated using the scFv fragments of Table 2 with additional sequences, SEQ ID NOs: 1-2, 6-7, 9-10, 12-13, 17-18, 20-21, and 36-37, shown below, to generate full CAR constructs.
- ⁇ CD8 hinge amino acid sequence
- ⁇ CD8 hinge (nucleic acid sequence) (SEQ ID NO: 13)
- Intracellular domain (amino acid sequence) (SEQ ID NO: 7)
- ⁇ CD3 zeta (nucleic acid sequence) (SEQ ID NO: 20)
- zeta domain amino acid sequence; NCBI Reference Sequence NM_000734.3 (SEQ ID NO: 10)
- ⁇ CD3 zeta nucleic acid sequence; NCBI Reference Sequence NM_000734.3) ; (SEQ ID NO: 21)
- ⁇ IgG4 Hinge (nucleotide sequence) (SEQ ID NO: 37)
- the CAR scFv fragments were then cloned into lentiviral vectors to create a full length CAR construct in a single coding frame, and using the EF1 alpha promoter for expression (SEQ ID NO: 11) .
- Gly/Ser SEQ ID NO: 26
- This sequence may encompass 1-6 "Gly Gly Gly Gly Ser" repeating units
- This sequence may encompass 50-5000 adenines.
- This sequence may encompass 50-5000 thymines.
- This sequence may encompass 100-5000 adenines.
- Gly/Ser SEQ ID NO: 38
- This sequence may encompass 1-10 "Gly Gly Gly Ser" repeating units
- Example 2 Expression and characterization of human anti-mesothelin scFv constructs for CAR therapy
- scFv constructs were transiently produced and purified from HEK293F cells along with human mesothelin extracellular domain (human MSLN ECD) .
- SS1 scFv which is a murine anti-mesothelin scFv, was also produced as a reference.
- the human anti-mesothelin scFvs tested were M5, M11, M12, M14, M16, M17, M21 and M23 (see Table 14) .
- the human scFv constructs (M5, M11, M12, M14, M16, M17, M21, and M23) had a short linker sequence comprising the sequence GS linking the C-terminus of the scFv to the N-terminus of an 8xHis Tag, e.g., Human mesothelin ECD was produced with a C-terminal Avi-Tag (SEQ ID NO: 276) and was site selectively biotinylated in vitro with BirA enzyme from Avidity, LLC. Transient expression and purification in HEK293F cells was performed with standard methodology.
- scFvs For scFvs, briefly, 100ml of HEK293F cells at 3x10 6 cells/ml were transfected with 100 ⁇ g plasmid and 300 ⁇ g polyethylenimine. The cells were incubated at 37°C with 8%CO 2 and rotated at 80 rpm. After six days, the cells were harvested by centrifugation at 3500g for 20 minutes. The supernatant was purified by binding the scFv to 200 ⁇ l Ni-NTA agarose beads (Qiagen) overnight at 4°C. The protein was eluted with 200 ⁇ l 300mM imidazole, and dialyzed against phosphate buffered saline.
- scFvs were analyzed with high-performance liquid chromatography coupled to mass spectrometry (HPLC-MS) . 1 ⁇ g each was injected onto a Poros R1/10 2.1 mm x 100 mm column (Life Technologies) heated to 60°C. Separation was performed on a Waters BioAcquity UPLC. Mobile Phase A was 0.1%formic acid; mobile phase B was 0.1%formic acid in 25%acetonitrile, 75%isopropanol. The scFvs were eluted at 0.5 mL/min using a gradient from 25-50%mobile phase B in 15 minutes.
- Mass spectrometry detection was performed with a Waters Xevo-Tof instrument operating in electrospray positive ion mode scanning from 600-4000 m/z with a cone voltage ramp of 20-50V. The resulting mass spectra were averaged across the width of the peak and deconvoluted using the MaxEnt1 algorithm from Waters to determine the masses of the expressed scFvs.
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Abstract
Description
Group | Day | Delta T/C (%) | Regression (%) |
|
52 | 162.23 | |
Isotype | |||
52 | 100.00 | | |
SS1 Single | |||
52 | 172.05 | | |
SS1 Double | |||
52 | 166.15 | | |
M5 Single | |||
52 | 30.28 | | |
M5 Double | |||
52 | NA | -63.90 | |
|
52 | 52.91 | |
M11 Double | |||
52 | NA | -15.80 |
Claims (110)
- An isolated nucleic acid molecule encoding a chimeric antigen receptor (CAR) , wherein the CAR comprises: i) an antibody or antibody fragment comprising a human anti-mesothelin binding domain, ii) a transmembrane domain, and iii) an intracellular signaling domain comprising a stimulatory domain, and wherein said anti-mesothelin binding domain comprises one or more of light chain complementary determining region 1 (LC CDR1) , light chain complementary determining region 2 (LC CDR2) , and light chain complementary determining region 3 (LC CDR3) comprising an amino acid sequence listed in Table 5 and one or more of heavy chain complementary determining region 1 (HC CDR1) , heavy chain complementary determining region 2 (HC CDR2) , and heavy chain complementary determining region 3 (HC CDR3) comprising an amino acid sequence listed in Table 4.
- The isolated nucleic acid molecule of claim 1, comprising a LC CDR1, LC CDR2 and LC CDR3, wherein LC CDR1, LC CDR2 and LC CDR3 comprise an amino acid sequence listed in Table 5.
- The isolated nucleic acid molecule of claim 1, comprising a HC CDR1, HC CDR2 and HC CDR3, wherein HC CDR1, HC CDR2 and HC CDR3 comprise an amino acid sequence listed in Table 4.
- The isolated nucleic acid molecule of claim 1, comprising LC CDR1, LC CDR2 and LC CDR3, wherein LC CDR1, LC CDR2 and LC CDR3 comprise an amino acid sequence listed in Table 5, and HC CDR1, HC CDR2, and HC CDR3, wherein HC CDR1, HC CDR2 and HC CDR3 comprise an amino acid sequence listed in Table 4.
- The isolated nucleic acid molecule of claim 1, wherein the anti-mesothlin binding domain comprises an amino acid sequence of any one of the light chain variable regions listed in Table 2.
- The isolated nucleic acid molecule of claim 1, wherein the anti-mesothlin binding domain comprises an amino acid sequence of any one of the heavy chain variable region listed in Table 2.
- The isolated nucleic acid molecule of claim 1, wherein the anti-mesothlin binding domain comprises an amino acid sequence of any light chain variable region listed in Table 2 and any heavy chain variable region listed Table 2.
- The isolated nucleic acid molecule of any of the preceding claims, wherein the anti-mesothelin binding domain is a scFv.
- The isolated nucleic acid molecule of any of the preceding claims, wherein the anti-mesothelin binding domain comprises a light chain variable region comprising an amino acid sequence having at least one, two or three modifications but not more than 30, 20 or 10 modifications of an amino acid sequence of a light chain variable region provided in Table 2, or a sequence with 95-99%identity to an amino acid sequence provided in Table 2.
- The isolated nucleic acid molecule of any of the preceding claims, wherein the anti-mesothelin binding domain comprises a heavy chain variable region comprising an amino acid sequence having at least one, two or three modifications but not more than 30, 20 or 10 modifications of an amino acid sequence of a heavy chain variable region provided in Table 2, or a sequence with 95-99%identity to an amino acid sequence provided in Table 2.
- The isolated nucleic acid molecule of any of the preceding claims, wherein the encoded anti-mesothelin binding domain comprises a sequence selected from a group consisting of SEQ ID NO: 39; SEQ ID NO: 40, SEQ ID NO: 41, SEQ ID NO: 42, SEQ ID NO: 43, SEQ ID NO: 44, SEQ ID NO: 45, SEQ ID NO: 46, SEQ ID NO: 47, SEQ ID NO: 48, SEQ ID NO: 49, SEQ ID NO: 50, SEQ ID NO: 51, SEQ ID NO: 52, SEQ ID NO: 53, SEQ ID NO: 54, SEQ ID NO: 55, SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, and SEQ ID NO: 62, or a sequence with 95-99%identify thereof.
- The isolated nucleic acid molecule of any of the preceding claims, wherein the nucleic acid sequence encoding the anti-mesothelin binding domain comprises a sequence selected from a group consisting of SEQ ID NO: 87; SEQ ID NO: 88, SEQ ID NO: 89, SEQ ID NO: 90, SEQ ID NO: 91, SEQ ID NO: 92, SEQ ID NO: 93, SEQ ID NO: 94, SEQ ID NO: 95, SEQ ID NO: 96, SEQ ID NO: 97, SEQ ID NO: 98, SEQ ID NO: 99, SEQ ID NO: 100, SEQ ID NO: 101, SEQ ID NO: 102, SEQ ID NO: 103, SEQ ID NO: 104, SEQ ID NO: 105, SEQ ID NO: 106, SEQ ID NO: 107, SEQ ID NO: 108, SEQ ID NO: 109, and SEQ ID NO: 110, or a sequence with 95-99%identify thereof.
- The isolated nucleic acid molecule of any of the preceding claims, wherein the encoded CAR includes a transmembrane domain that comprises a transmembrane domain of a protein selected from the group consisting of the alpha, beta or zeta chain of the T-cell receptor, CD28, CD3 epsilon, CD45, CD4, CD5, CD8, CD9, CD16, CD22, CD33, CD37, CD64, CD80, CD86, CD134, CD137 and CD154.
- The isolated nucleic acid molecule of any of the preceding claims, wherein the encoded transmembrane domain comprises a sequence of SEQ ID NO: 6.
- The isolated nucleic acid molecule of any of the preceding claims, wherein the encoded transmembrane domain comprises an amino acid sequence that comprises at least one, two or three modifications but not more than 20, 10 or 5 modifications of an amino acid sequence of SEQ ID NO: 6, or a sequence with 95-99%identity to an amino acid sequence of SEQ ID NO: 6.
- The isolated nucleic acid molecule of any of the preceding claims, wherein the nucleic acid sequence encoding the transmembrane domain comprises a sequence of SEQ ID NO: 17, or a sequence with 95-99%identify thereof.
- The isolated nucleic acid molecule of any of the preceding claims, wherein the encoded anti-mesothelin binding domain is connected to the transmembrane domain by a hinge region.
- The isolated nucleic acid molecule of claim 17, wherein the encoded hinge region comprises SEQ ID NO: 2, or a sequence with 95-99%identity thereof.
- The isolated nucleic acid molecule of claim 17, wherein the nucleic acid sequence encoding the hinge region comprises a sequence of SEQ ID NO: 13, or a sequence with 95-99%identify thereof.
- The isolated nucleic acid molecule of any of the preceding claims, further comprising a sequence encoding a costimulatory domain.
- The isolated nucleic acid molecule of claim 20, wherein the costimulatory domain is a functional signaling domain obtained from a protein selected from the group consisting of OX40, CD2, CD27, CD28, CDS, ICAM-1, LFA-1 (CD11a/CD18) , ICOS (CD278) , and 4-1BB (CD137) .
- The isolated nucleic acid molecule of claim 20 or 21, wherein the encoded costimulatory domain comprises a sequence of SEQ ID NO: 7.
- The isolated nucleic acid molecule of claim 20 or claim 21, wherein the encoded costimulatory domain comprises an amino acid sequence having at least one, two or three modifications but not more than 20, 10 or 5 modifications of an amino acid sequence of SEQ ID NO: 7, or a sequence with 95-99%identity to an amino acid sequence of SEQ ID NO: 7.
- The isolated nucleic acid molecule of claim 20 or 21, wherein the nucleic acid sequence encoding the costimulatory domain comprises a sequence of SEQ ID NO: 18, or a sequence with 95-99%identify thereof.
- The isolated nucleic acid molecule of any of the preceding claims, wherein the encoded intracellular signaling domain comprises a functional signaling domain of 4-1BB and/or a functional signaling domain of CD3 zeta.
- The isolated nucleic acid molecule of any of the preceding claims, wherein the encoded intracellular signaling domain comprises the sequence of SEQ ID NO: 7 and/or the sequence of SEQ ID NO: 9 or SEQ ID NO: 10.
- The isolated nucleic acid molecule of any of the preceding claims, wherein the intracellular signaling domain comprises an amino acid sequence having at least one, two or three modifications but not more than 20, 10 or 5 modifications of an amino acid sequence of SEQ ID NO: 7 and/or an amino acid sequence of SEQ ID NO: 9 or SEQ ID NO: 10, or a sequence with 95-99%identity to an amino acid sequence of SEQ ID NO: 7 and/or an amino acid sequence of SEQ ID NO: 9 or SEQ ID NO: 10.
- The isolated nucleic acid molecule of any of the preceding claims, wherein the encoded intracellular signaling domain comprises the sequence of SEQ ID NO: 7 and the sequence of SEQ ID NO: 9 or SEQ ID NO: 10, wherein the sequences comprising the intracellular signaling domain are expressed in the same frame and as a single polypeptide chain.
- The isolated nucleic acid molecule of any of the preceding claims, wherein the nucleic acid sequence encoding the intracellular signaling domain comprises a sequence of SEQ ID NO:18, or a sequence with 95-99%identify thereof, and/or a sequence of SEQ ID NO: 20 or SEQ ID NO: 21, or a sequence with 95-99%identity thereof.
- The isolated nucleic acid molecule of any of the preceding claims, further comprising a leader sequence.
- The isolated nucleic acid molecule of claim 32, wherein the leader sequence comprises SEQ ID NO: 1.
- An isolated polypeptide molecule encoded by the nucleic acid molecule of any one of claims 1-32.
- The isolated polypeptide of claim 32, comprising a sequence selected from the group consisting of SEQ ID NO: 63; SEQ ID NO: 64, SEQ ID NO: 65, SEQ ID NO: 66, SEQ ID NO:67, SEQ ID NO: 68, SEQ ID NO: 69, SEQ ID NO: 70, SEQ ID NO: 71, SEQ ID NO: 72, SEQ ID NO: 73, SEQ ID NO: 74, SEQ ID NO: 75, SEQ ID NO: 76, SEQ ID NO: 77, SEQ ID NO: 78, SEQ ID NO: 79, SEQ ID NO: 80, SEQ ID NO: 81, SEQ ID NO: 82, SEQ ID NO: 83, SEQ ID NO: 84, SEQ ID NO: 85, and SEQ ID NO: 86.
- An isolated chimeric antigen receptor (CAR) molecule comprising a human anti-mesothelin binding domain, a transmembrane domain, and an intracellular signaling domain.
- The isolated CAR molecule of claim 34, comprising i) an antibody or antibody fragment which includes a human anti-mesothelin binding domain, ii) a transmembrane domain, and iii) an intracellular signaling domain.
- The isolated CAR molecule of any of claims 34 or 35, wherein the anti-mesothelin binding domain does not compete for binding to human mesothelin with an antigen binding domain comprising a sequence comprising SEQ ID NO: 279.
- The isolated CAR molecule of any of claims 34-36, wherein the anti-mesothelin binding domain competes with an antigen binding domain comprising:a) one or more light chain complementary determining region 1 (LC CDR1) , light chain complementary determining region 2 (LC CDR2) , and light chain complementary determining region 3 (LC CDR3) of an anti-mesothelin binding domain sequence selected from SEQ ID NO: 43 and SEQ ID NO: 49, and one or more heavy chain complementary determining region 1 (HC CDR1) , heavy chain complementary determining region 2 (HC CDR2) , and heavy chain complementary determining region 3 (HC CDR3) of an anti-mesothelin binding domain sequence selected from SEQ ID NO: 43 and SEQ ID NO: 49;b) a LC CDR1, LC CDR2 and LC CDR3 of an anti-mesothelin light chain amino acid sequence selected from SEQ ID NO: 43 and SEQ ID NO: 49, and an HC CDR1, HC CDR2, and HC CDR3 of an anti-mesothelin heavy chain amino acid sequence selected from SEQ ID NO: 43 and SEQ ID NO: 49; orc) a sequence selected from SEQ ID NO: 43 and SEQ ID NO: 49.
- The isolated CAR molecule of any of claims 34-37, wherein the anti-mesothelin binding domain binds to a different epitope of human mesothelin than the epitope of human mesothelin targeted by the antigen binding domain comprising a sequence comprising SEQ ID NO: 279.
- The isolated CAR molecule of any of claims 34-38, wherein the anti-mesothelin binding domain binds to the C-terminus of human mesothelin.
- The isolated CAR molecule of claim 39, wherein the anti-mesothelin binding domain binds an epitope within amino acids 450-588 of SEQ ID NO: 278.
- The isolated CAR molecule of claim 40, wherein the epitope comprises amino acids 485-490, 498-507, 532-537, or 545-572 of SEQ ID NO: 278, or any subset or a combination thereof.
- The isolated CAR molecule of any of claims 34-41, wherein the human anti-mesothelin binding domain comprises one or more light chain complementary determining region 1 (LC CDR1) , light chain complementary determining region 2 (LC CDR2) , and light chain complementary determining region 3 (LC CDR3) comprising an amino acid sequence listed in Table 5, and one or more heavy chain complementary determining region 1 (HC CDR1) , heavy chain complementary determining region 2 (HC CDR2) , and heavy chain complementary determining region 3 (HC CDR3) comprising an amino acid sequence listed in Table 4.
- The isolated CAR molecule of any of claims 34-42, comprising LC CDR1, LC CDR2 and LC CDR3 comprising an amino acid sequence listed in Table 5.
- The isolated CAR molecule of any of claims 34-43, comprising HC CDR1, HC CDR2, and HC CDR3 comprising an amino acid sequence listed in Table 4.
- The isolated CAR molecule of any of claims 34-44, comprising LC CDR1, LC CDR2 and LC CDR3 comprising an amino acid sequence listed in Table 5, and HC CDR1, HC CDR2, and HC CDR3 comprising an amino acid sequence listed in Table 4.
- The isolated CAR molecule of any of claims 59-45, wherein the anti-mesothelin binding domain is a scFv.
- The isolated CAR molecule of any of claims 34-46, wherein the anti-mesothelin binding domain comprises a light chain and a heavy chain of an amino acid sequence listed in Table 2.
- The isolated CAR molecule of any of claims 34-47, wherein the anti-mesothelin binding domain comprises: a light chain variable region comprising an amino acid sequence having at least one, two or three modifications but not more than 30, 20 or 10 modifications of an amino acid sequence of a light chain variable region provided in Table 2, or a sequence with 95-99%identity with an amino acid sequence provided in Table 2.
- The isolated CAR molecule of any of claims 34-48, wherein the anti-mesothelin binding domain comprises a heavy chain variable region comprising an amino acid sequence having at least one, two or three modifications but not more than 30, 20 or 10 modifications of an amino acid sequence of a heavy chain variable region provided in Table 2, or a sequence with 95-99%identity to an amino acid sequence provided in Table 2.
- The isolated CAR molecule of any of claims 34-49, wherein the anti-mesothelin binding domain comprises a sequence selected from a group consisting of SEQ ID NO: 39, SEQ ID NO:40, SEQ ID NO: 41, SEQ ID NO: 42, SEQ ID NO: 43, SEQ ID NO: 44, SEQ ID NO: 45, SEQ ID NO: 46, SEQ ID NO: 47, SEQ ID NO: 48, SEQ ID NO: 49, SEQ ID NO: 50, SEQ ID NO: 51, SEQ ID NO: 52, SEQ ID NO: 53, SEQ ID NO: 54, SEQ ID NO: 55, SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, and SEQ ID NO: 62, or a sequence with 95-99%identity thereof.
- The isolated CAR molecule of any of claims 34-50, wherein the transmembrane comprises a transmembrane domain of a protein selected from the group consisting of the alpha, beta or zeta chain of the T-cell receptor, CD28, CD3 epsilon, CD45, CD4, CD5, CD8, CD9, CD16, CD22, CD33, CD37, CD64, CD80, CD86, CD134, CD137 and CD154.
- The isolated CAR molecule of claim 51, wherein the transmembrane domain comprises a sequence of SEQ ID NO: 6.
- The isolated CAR molecule of claim 51, wherein the transmembrane domain comprises an amino acid sequence having at least one, two or three modifications but not more than 20, 10 or 5 modifications of an amino acid sequence of SEQ ID NO: 6, or a sequence with 95-99%identity to an amino acid sequence of SEQ ID NO: 6.
- The isolated CAR molecule of any one of claims 34-53, wherein the human anti-mesothelin binding domain is connected to the transmembrane domain by a hinge region.
- The isolated CAR molecule of claim 54, wherein the hinge region comprises SEQ ID NO: 2 or SEQ ID NO: 36, or a sequence with 95-99%identity thereof.
- The isolated CAR molecule of any of claims 34-55, wherein the intracellular signaling domain comprises a sequence encoding a costimulatory domain.
- The isolated CAR molecule of claim 56, wherein the costimulatory domain comprises a functional signaling domain of a protein selected from the group consisting of OX40, CD2, CD27, CD28, CDS, ICAM-1, LFA-1 (CD11a/CD18) , CD278 (also known as “ICOS” ) and 4-1BB (CD137) .
- The isolated CAR molecule of claim 56 or 57, wherein the costimulatory domain comprises a sequence of SEQ ID NO: 7.
- The isolated CAR molecule of claim 56 or 57, wherein the costimulatory domain comprises an amino acid sequence having at least one, two or three modifications but not more than 20, 10 or 5 modifications of an amino acid sequence of SEQ ID NO: 7, or a sequence with 95-99%identity to an amino acid sequence of SEQ ID NO: 7.
- The isolated CAR molecule of claim 34-59, wherein the intracellular signaling domain comprises a functional signaling domain of 4-1BB and/or a functional signaling domain of CD3 zeta.
- The isolated CAR molecule of claim 60, wherein the intracellular signaling domain comprises the sequence of SEQ ID NO: 7 and/or the sequence of SEQ ID NO: 9.
- The isolated CAR molecule of claim 60, wherein the intracellular signaling domain comprises the sequence of SEQ ID NO: 7 and/or the sequence of SEQ ID NO: 10.
- The isolated CAR molecule of any of claims 34-55, wherein the intracellular signaling domain comprises an amino acid sequence having at least one, two or three modifications but not more than 20, 10 or 5 modifications of an amino acid sequence of SEQ ID NO: 7 and/or an amino acid sequence of SEQ ID NO: 9 or SEQ ID NO: 10, or a sequence with 95-99%identity to an amino acid sequence of SEQ ID NO: 7 and/or an amino acid sequence of SEQ ID NO: 9 or SEQ ID NO: 10.
- The isolated CAR molecule of any of claims 34-55, wherein the intracellular signaling domain comprises the sequence of SEQ ID NO: 7 and the sequence of SEQ ID NO: 9 or SEQ ID NO: 10, wherein the sequences comprising the intracellular signaling domain are expressed in the same frame and as a single polypeptide chain.
- The isolated CAR molecule of any of claims 59-64, further comprising a leader sequence.
- The isolated CAR molecule of claim 65, wherein the leader sequence comprises an amino acid sequence of SEQ ID NO: 1, or a sequence with 95-99%identity to an amino acid sequence of SEQ ID NO: 1.
- A human anti-mesothelin binding domain comprising one or more light chain complementary determining region 1 (LC CDR1) , light chain complementary determining region 2 (LC CDR2) , and light chain complementary determining region 3 (LC CDR3) of any anti-mesothelin binding domain in SEQ ID NO: 39, SEQ ID NO: 40, SEQ ID NO: 41, SEQ ID NO: 42, SEQ ID NO: 43, SEQ ID NO: 44, SEQ ID NO: 45, SEQ ID NO: 46, SEQ ID NO: 47, SEQ ID NO: 48, SEQ ID NO: 49, SEQ ID NO: 50, SEQ ID NO: 51, SEQ ID NO: 52, SEQ ID NO: 53, SEQ ID NO: 54, SEQ ID NO: 55, SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, and SEQ ID NO: 62, and one or more heavy chain complementary determining region 1 (HC CDR1) , heavy chain complementary determining region 2 (HC CDR2) , and heavy chain complementary determining region 3 (HC CDR3) of any human anti-mesothelin binding domain in SEQ ID NO:39, SEQ ID NO: 40, SEQ ID NO: 41, SEQ ID NO: 42, SEQ ID NO: 43, SEQ ID NO: 44, SEQ ID NO: 45, SEQ ID NO: 46, SEQ ID NO: 47, SEQ ID NO: 48, SEQ ID NO: 49, SEQ ID NO: 50, SEQ ID NO: 51, SEQ ID NO: 52, SEQ ID NO: 53, SEQ ID NO: 54, SEQ ID NO: 55, SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, and SEQ ID NO: 62.
- The human anti-mesothelin binding domain of claim 67, wherein the human anti-mesothelin binding domain is a scFv comprising a light chain and a heavy chain of an amino acid sequence of SEQ ID NO: 39, SEQ ID NO: 40, SEQ ID NO: 41, SEQ ID NO: 42, SEQ ID NO: 43, SEQ ID NO: 44, SEQ ID NO: 45, SEQ ID NO: 46, SEQ ID NO: 47, SEQ ID NO: 48, SEQ ID NO: 49, SEQ ID NO: 50, SEQ ID NO: 51, SEQ ID NO: 52, SEQ ID NO: 53, SEQ ID NO: 54, SEQ ID NO: 55, SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, and SEQ ID NO: 62.
- The human anti-mesothelin binding domain of claim 67 or 68, wherein the human anti-mesothelin binding domain comprises: a light chain variable region comprising an amino acid sequence having at least one, two or three modifications but not more than 30, 20 or 10 modifications of an amino acid sequence of a light chain variable region provided in SEQ ID NO:39, SEQ ID NO: 40, SEQ ID NO: 41, SEQ ID NO: 42, SEQ ID NO: 43, SEQ ID NO: 44, SEQ ID NO: 45, SEQ ID NO: 46, SEQ ID NO: 47, SEQ ID NO: 48, SEQ ID NO: 49, SEQ ID NO: 50, SEQ ID NO: 51, SEQ ID NO: 52, SEQ ID NO: 53, SEQ ID NO: 54, SEQ ID NO: 55, SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, or SEQ ID NO: 62, or a sequence with 95-99%identity with an amino acid sequence of SEQ ID NO: 39, SEQ ID NO: 40, SEQ ID NO: 41, SEQ ID NO: 42, SEQ ID NO: 43, SEQ ID NO: 44, SEQ ID NO: 45, SEQ ID NO: 46, SEQ ID NO: 47, SEQ ID NO: 48, SEQ ID NO: 49, SEQ ID NO: 50, SEQ ID NO: 51, SEQ ID NO: 52, SEQ ID NO: 53, SEQ ID NO: 54, SEQ ID NO: 55, SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, or SEQ ID NO: 62; and/or a heavy chain variable region comprising an amino acid sequence having at least one, two or three modifications but not more than 30, 20 or 10 modifications of an amino acid sequence of a heavy chain variable region provided in SEQ ID NO: 39, SEQ ID NO: 40, SEQ ID NO: 41, SEQ ID NO: 42, SEQ ID NO: 43, SEQ ID NO: 44, SEQ ID NO: 45, SEQ ID NO: 46, SEQ ID NO: 47, SEQ ID NO: 48, SEQ ID NO: 49, SEQ ID NO: 50, SEQ ID NO: 51, SEQ ID NO: 52, SEQ ID NO: 53, SEQ ID NO: 54, SEQ ID NO: 55, SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, or SEQ ID NO: 62; or a sequence with 95-99%identity to an amino acid sequence in SEQ ID NO: 39, SEQ ID NO: 40, SEQ ID NO: 41, SEQ ID NO: 42, SEQ ID NO: 43, SEQ ID NO: 44, SEQ ID NO: 45, SEQ ID NO: 46, SEQ ID NO: 47, SEQ ID NO: 48, SEQ ID NO: 49, SEQ ID NO: 50, SEQ ID NO: 51, SEQ ID NO: 52, SEQ ID NO: 53, SEQ ID NO: 54, SEQ ID NO: 55, SEQ ID NO: 56, SEQ ID NO: 57, SEQ ID NO: 58, SEQ ID NO: 59, SEQ ID NO: 60, SEQ ID NO: 61, or SEQ ID NO: 62.
- An human anti-mesothelin binding domain, wherein the anti-mesothelin binding domain does not compete for binding to human mesothelin with an antigen binding domain comprising a sequence comprising SEQ ID NO: 279.
- The human anti-mesothelin binding domain of claim 70, wherein the anti-mesothelin binding domain competes with an antigen binding domain comprising:a) one or more light chain complementary determining region 1 (LC CDR1) , light chain complementary determining region 2 (LC CDR2) , and light chain complementary determining region 3 (LC CDR3) of an anti-mesothelin binding domain sequence selected from SEQ ID NO: 43 and SEQ ID NO: 49 and one or more heavy chain complementary determining region 1 (HC CDR1) , heavy chain complementary determining region 2 (HC CDR2) , and heavy chain complementary determining region 3 (HC CDR3) of an anti-mesothelin binding domain sequence selected from SEQ ID NO: 43 and SEQ ID NO: 49b) a LC CDR1, LC CDR2 and LC CDR3 of an anti-mesothelin light chain amino acid sequence selected from SEQ ID NO: 43 and SEQ ID NO: 49 and an HC CDR1, HC CDR2, and HC CDR3 of an anti-mesothelin heavy chain amino acid sequence selected from SEQ ID NO: 43 and SEQ ID NO: 49; orc) a sequence selected from SEQ ID NO: 43 and SEQ ID NO: 49.
- The human anti-mesothelin binding domain any of claims 70 or 71, wherein the anti-mesothelin binding domain binds to a different epitope of human mesothelin than the epitope of human mesothelin targeted by an antigen binding domain comprising a sequence comprising SEQ ID NO: 279.
- The human anti-mesothelin binding domain of any of claims 70-72, wherein the anti-mesothelin binding domain binds to the C-terminus of human mesothelin.
- The human anti-mesothelin binding domain of claim 73, wherein the anti-mesothelin binding domain binds an epitope within amino acids 450-588 of SEQ ID NO: 278.
- The human anti-mesothelin binding domain of claim 74, wherein the epitope comprises amino acids 485-490, 498-507, 532-537, or 545-572 of SEQ ID NO: 278, or any subset or a combination thereof.
- A vector comprising a nucleic acid molecule encoding a CAR of any of the preceding claims.
- The vector of claim 76, wherein the vector is selected from the group consisting of a DNA, a RNA, a plasmid, a lentivirus vector, adenoviral vector, or a retrovirus vector.
- The vector of claim 76 or 77, further comprising a promoter.
- The vector of claim 78, wherein the promoter is an EF-1 promoter.
- The vector of claim 79, wherein the EF-1 promoter comprises a sequence of SEQ ID NO: 11.
- The vector of any of claims 76-78, wherin the vector is an in vitro transcribed vector.
- The vector of claim 81, wherein the, the nucleic acid sequence in the vector further comprises a poly (A) tail.
- The vector of any of claims 81, wwherein the nucleic acid sequence in the vector further comprises a 3’ UTR.
- A cell comprising the vector of any of claims 76-83.
- The cell of claim 84, wherein the cell is a human T cell.
- The cell of claim 85, wherein the T cell is a CD8+ T cell.
- A method of making a cell comprising transducing a T cell with a vector of any of claims 76-83.
- A method of generating a population of RNA-engineered cells comprising introducing an in vitro transcribed RNA or synthetic RNA into a cell, where the RNA comprises a nucleic acid encoding a CAR molecule of any of the preceding claims.
- A method of providing an anti-cancer immunity in a mammal comprising administering to the mammal an effective amount of a cell expressing a CAR molecule of any of the preceding claims.
- The method of claim 89, wherein the cell is an autologous T cell.
- The method of claim 89 or 90, wherein the cell is an allogeneic T cell.
- The method of any of claims 89-91, wherein the mammal is a human.
- A method of treating a mammal having a disease associated with expression of mesothelin comprising administering to the mammal an effective amount of a cell comprising a CAR moleculeof any of the preceding claims.
- The method of claim 93, wherein the disease associated with mesothelin expression is selected from a proliferative disease such as a cancer or malignancy or a precancerous condition, or is a non-cancer related indication associated with expression of mesothelin.
- The method of claim 93-94, wherein the disease is a cancer associated with mesothelin selected from the group consisting of mesothelioma, malignant pleural mesothelioma, non-small cell lung cancer, small cell lung cancer, squamous cell lung cancer, or large cell lung cancer, pancreatic cancer, pancreatic ductal adenocarcinoma, pancreatic metatstatic, ovarian cancer, colorectal cancer and bladder cancer, or any combination thereof.
- The method of any of claims 93-95, wherein the cells expressing a CAR molecule are administered in combination with an agent that increases the efficacy of a cell expressing a CAR molecule.
- The method of any of claims 93-96, wherein the cells expressing a CAR molecule are administered in combination with an agent that ameliorates one or more side effects associated with administration of a cell expressing a CAR molecule.
- The method of any of claims 93-97, wherein the cells expressing a CAR molecule are administered in combination with an agent that treats the disease associated with mesothelin
- The isolated nucleic acid molecule of any of claims 1-31, the isolated polypeptide molecule of any of claims 32-33, the isolated CAR of any of claims 34-66, the anti-mesothelin binding domain of any of claims 67-75, the vector of any of claims 76-83 or the cell of any of claims 84-86 for use as a medicament.
- The isolated nucleic acid molecule of any of claims 1-31, the isolated polypeptide molecule of any of claims 32-33, the isolated CAR of any of claims 34-66, the anti-mesothelin binding domain of any of claims 67-75, the vector of any of claims 76-83 or the cell of any of claims 84-86 for use in the treatment of a disease expressing mesothelin.
- A cell of any of claims 84-86, further expressing an inhibitory molecule that comprises a first polypeptide that comprises at least a portion of an inhibitory molecule, associated with a second polypeptide that comprises a positive signal from an intracellular signaling domain.
- The cell of claim 101, wherein the first polypeptide comprises at least a portion of PD1 and the second polypeptide comprises a costimulatory domain and a intracellular signaling domain.
- The method of claim 96, wherein the agent is an mTOR inhibitor and the subject is administered a low, immune enhnacing, dose of an mTOR inhibitor, e. g. , RAD001 or rapamycin.
- The method of claim 103, wherein the mTOR inhibitor is a RAD001.
- The method of claim 103, wherein the dose comprises an allosteric and a catalytic mTOR inhibitor.
- The method of 103, wherein the mTOR inhibitor is administered for an amount of time sufficient to decrease the proportion of PD-1 positive T cells, increase the proportion of PD- 1 negative T cells, or increase the ratio of PD-1 negative T cells/PD-1 positive T cells, in the peripheral blood of the subject, or in a preparation of T cells isolated from the subject.
- The method of claim 103, wherein the immune effector cell, e. g. , T cell, to be engineered to express a CAR, is harvested after a sufficient time, or after sufficient dosing of the low, immune enhancing, dose of an mTOR inhibitor, such that the level of PD1 negative immune effector cells, e. g. , T cells, or the ratio of PD1 negative immune effector cells, e. g. , T cells/PD1 positive immune effector cells, e. g. , T cells, in the subject or harvested from the subject has been, at least transiently, increased.
- The method of claim 103, wherein the dose of an mTOR inhibitor is associated with mTOR inhibition of at least 5 but no more than 90%, e. g. , as measured by p70 S6 kinase inhibition.
- The method of claim 103, wherein the dose of an mTOR inhibitor is associated with mTOR inhibition of at least 10%but no more than 40%, e. g. , as measured by p70 S6 kinase inhibition.
- A method of treating a subject having a disease associated with expression of mesothelin comprising administering to the subject an effective amount of cells comprising a nucleic acid of any of claims 1-31, wherein the nucleic acid is introduced into T cells or NK cells using in vitro transcription, and the subject receives an initial administration of the cells comprising the nucleic acid, and one or more subsequent administrations of cells comprising the nucleic acid, wherein the one or more subsequent administrations are administered less than 15 days, e. g. , 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, or 2 days after the previous administration.
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