NZ749028B2 - Chimeric antigen receptors - Google Patents

Abstract

Provided herein are therapeutic polypeptides, e.g., chimeric antigen receptors, able to direct an immune cell, e.g., a T lymphocyte to a target antigen, and able to cause the T cell to proliferate or to kill cells displaying the antigen when the antigen binds to the polypeptide, wherein the polypeptides comprise a transmembrane domain from a T cell co-inhibitory protein such as CTLA4 or PD-1. Also provided herein are T lymphocytes expressing the polypeptides, and use of such T lymphocytes to treat diseases such as cancer. ides comprise a transmembrane domain from a T cell co-inhibitory protein such as CTLA4 or PD-1. Also provided herein are T lymphocytes expressing the polypeptides, and use of such T lymphocytes to treat diseases such as cancer.

Description

CHIMERIC ANTIGEN RECEPTORS This application is a divisional ation of New Zealand Patent Application No. 709253 which is the national phase entry of published as WO2014/003385) dated 19 December 2013 and claims the benefit of and priority to U.S.

Provisional Patent Application No. 61/740,113, filed December 20, 2012, and U.S. Provisional Patent ation No. 61/779,925, filed March 13, 2013, the disclosure of each which is incorporated herein by reference in their ty. 1. FIELD The disclosure herein relates to the field of immunology, and more specifically, to the modification of T cytes or other immune cells. 2. BACKGROUND Cells of the immune system such as T lymphocytes (also referred to as T cells) recognize and interact with specific antigens through receptors or receptor complexes which, upon recognition or an interaction with such antigens, cause activation of the cell. An example of such a receptor is the antigen-specific T lymphocyte receptor complex (TCR/CD3), a complex of eight proteins. The T cell receptor (TCR) is sed on the surface of T lymphocytes. One ent, CD3, which has an invariant structure, is responsible for ellular signaling following occupancy of the TCR by ligand. The T lymphocyte receptor for antigen-CD3 x (TCR/CD3) recognizes nic peptides that are presented to it by the proteins of the major histocompatibility complex (MHC). Complexes of MHC and e are expressed on the surface of n presenting cells and other T lymphocyte s. Stimulation of the TCR/CD3 complex results in activation of the T lymphocyte and a consequent antigen-specific immune response. The TCR/CD3 complex plays a central role in the effector on and regulation of the immune system.

T lymphocytes require a second, co-stimulatory signal to become fully active. Without such a signal, T lymphocytes are either non-responsive to antigen binding to the TCR, or become anergic. Such a co-stimulatory signal, for example, is provided by CD28, a T lymphocyte protein, which interacts with CD80 and CD86 on antigen-producing cells. ICOS (Inducible COStimulator), another T lymphocyte protein, provides a co-stimulatory signal when bound to ICOS ligand. CTLA4 (cytotoxic T-Lymphocyte Antigen 4), also known as CD152, is a receptor expressed on the surface of helper T cells and CD4+ T cells, that downregulates T cell activity.

Binding of CTLA4 to its cognate s, CD80 and CD86, results in reduced T cell activation and proliferation. PD-1 (Programmed Cell Death-1), also known as CD279, is currently understood to vely regulate T Cell Receptor (TCR) signals, and to broadly negatively regulate immune responses.

The essential antigen-binding, signaling, and stimulatory functions of the TCR complex have been reduced by genetic recombination methods to a single polypeptide chain, generally referred to as a Chimeric Antigen Receptor (CAR). See, e.g., Eshhar, U.S. Patent No. 7,741,465; , U.S. Patent Application Publication No. 2012/0093842. T lymphocytes bearing such CARs are generally referred to as CAR-T lymphocytes. CARs are constructed specifically to stimulate T cell activation and proliferation in se to a specific antigen to which the CAR binds. 3. SUMMARY In one aspect, provided herein are polypeptides, e.g., chimeric antigen receptors (see, e.g., Eshhar, U.S. Patent No. 7,741,465), that can be expressed by immune system cells, e.g., T cytes (T , are ne-bound in such immune system cells, and which comprise a transmembrane domain from an immune system protein that normally transmits an inhibitory signal to such immune system cells, e.g., a embrane domain from CTLA4 (Cytotoxic T-Lymphocyte Antigen 4 or Cytotoxic T-Lymphocyte Associated protein 4) or PD-1 (Programmed Cell Death-1). [06a] The present invention particularly s to the use of a polypeptide as ed below, or a T-lymphocyte as provided below, in the manufacture of a medicament for treating cancer in a subject in need thereof.

In one ment, provided herein is a polypeptide comprising (i) a transmembrane domain comprising the transmembrane domain from CTLA4 (e.g., GenBank Accession No.

NM_005214.4 (CTLA4 cytotoxic T-lymphocyte-associated protein 4 (Homo sapiens); Gene ID: 1493)) or PD-1 (e.g., GenBank Accession No. NM_005018.2 (programmed cell death 1 (Homo sapiens ); Gene ID: 5133)), or a portion thereof, (ii) an intracellular domain (e.g., cytoplasmic domain) of an endogenous protein expressed on the surface of cytes that triggers the activation and/or proliferation of said lymphocytes, and (iii) an extracellular domain that binds to an antigen of interest, wherein if the transmembrane domain is from CTLA4, the intracellular domain and extracellular domain of said polypeptide are not from CTLA4; and if the transmembrane domain is from PD-1, the intracellular domain and ellular domain of said polypeptide are not from PD-1. In a specific embodiment, the polypeptide is a chimeric antigen or (CAR). In a specific embodiment, a T cyte expressing said polypeptide, or any of such polypeptides described herein, is activated or stimulated to proliferate when said polypeptide binds to said antigen. In a specific embodiment, the polypeptide, when expressed on the surface of a T cyte, directs the T cyte to kill a cell expressing said antigen.

In a specific embodiment, provided herein is a polypeptide comprising a transmembrane domain from CTLA4, wherein the CTLA4 transmembrane domain is the polypeptide sequence encoded by exon 3 of a human ctla4 gene (e. g., GenBank Accession No. NM_005214.4 (CTLA4 cytotoxic T-lymphocyte-associated protein 4 (Homo sapiens); Gene ID: 1493)).

In another specific embodiment, the CTLA4 transmembrane domain of a polypeptide provided herein is or ses the amino acid sequence PEPCPDSDFLLWILAAVSSGLFFYSFLLTAVSLSKM (in three-letter code, Pro-Glu-Pro-Cys- Pro-Asp-Ser-Asp-Phe-Leu-Leu-Trp-Ile-Leu-Ala-Ala-Val-Ser-Ser-Gly-Leu-Phe-Phe-Tyr-Ser- Phe-Leu-Leu-Thr-Ala-Val-Ser-Leu-Ser-Lys-Met) (SEQ ID NO:1).

In another specific embodiment, the CTLA4 transmembrane domain of a polypeptide provided herein is or comprises the polypeptide sequence encoded by nucleotides 610-722 of GenBank Accession No. NM_005214.4 (CTLA4 cytotoxic hocyte-associated protein 4 (Homo sapiens); Gene ID: 1493).

In another specific embodiment, the CTLA4 embrane domain of a polypeptide provided herein is or comprises the amino acid sequence PDSDFLLWILAAVSSGLFFYSFLLTAVSL (in three-letter code, p-Ser-Asp-Phe-Leu- Leu-Trp-Ile-Leu-Ala-Ala-Val-Ser-Ser-Gly-Leu-Phe-Phe-Tyr-Ser-Phe-Leu-Leu-Thr-Ala-Val- Ser-Leu) (SEQ ID NO:2).

In another specific embodiment, the CTLA4 transmembrane domain of a polypeptide provided herein is or comprises the polypeptide sequence encoded by nucleotides 636-699 of GenBank ion No. NM_005214.4 (CTLA4 cytotoxic hocyte-associated protein 4 (Homo sapiens); Gene ID: 1493).

In another specific embodiment, the CTLA4 transmembrane domain of a polypeptide provided herein is or comprises the amino acid sequence FLLWILAAVSSGLFFYSFLLTAV (in letter code, Phe-Leu-Leu-Trp-Ile-Leu-Ala-Ala-Val-Ser-Ser-Gly-Leu-Phe-Phe-Tyr-Ser- Phe-Leu-Leu-Thr-Ala-Val) (SEQ ID NO:3).

In another specific ment, the CTLA4 transmembrane domain of a polypeptide provided herein is or comprises the polypeptide ce FLLWILAAVSSGLFFYSFLLT (in three-letter code, Phe-Leu-Leu-Trp-Ile-Leu-Ala-Ala-Val-Ser-Ser-Gly-Leu-Phe-Phe-Tyr-Ser- Phe-Leu-Leu-Thr) (SEQ ID NO:4).

In another specific embodiment, the CTLA4 transmembrane domain of a polypeptide provided herein is or comprises the polypeptide ce FLLWILVAVSLGLFFYSFLVSAVSLS (in three-letter code, u-Leu-Trp-Ile-Leu-Val- Ala-Val-Ser-Leu-Gly-Leu-Phe-Phe-Tyr-Ser-Phe-Leu-Val-Ser-Ala-Val-Ser-Leu-Ser) (SEQ ID NO:5).

In another specific embodiment, the CTLA4 transmembrane domain of a polypeptide provided herein is or comprises the polypeptide sequence LGIGNGTQIYVIDPEPSPDSDFLLWILAAVSSGLFFYSFLLTAVSLSKM (in three-letter code, Leu Gly Ile Gly Asn Gly Thr Gln Ile Tyr Val Ile Asp Pro Glu Pro Ser Pro Asp Ser Asp Phe Leu Leu Trp Ile Leu Ala Ala Val Ser Ser Gly Leu Phe Phe Tyr Ser Phe Leu Leu Thr Ala Val Ser Leu Ser Lys Met) (SEQ ID NO:9).

In another specific embodiment, the CTLA4 transmembrane domain of a polypeptide provided herein is or ses the polypeptide sequence FLLWILAAVSSGLFFYSFLLTAVSLSKM (in three-letter code, Phe Leu Leu Trp Ile Leu Ala Ala Val Ser Ser Gly Leu Phe Phe Tyr Ser Phe Leu Leu Thr Ala Val Ser Leu Ser Lys Met) (SEQ ID NO: 10).

In another specific embodiment, the PD-l transmembrane domain of a ptide provided herein is or ses the amino acid sequence TLVVGVVGGLLGSLVLLVWVLAVICSRAA (in three-letter code, Thr-Leu-Val-Val-Gly-Val- y-Gly-Leu-Leu-Gly-Ser-Leu-Val-Leu-Leu-Val-Trp-Val-Leu-Ala-Val-Ile-Cys-Ser-Arg- Ala-Ala) (SEQ ID NO:6).

In another specific embodiment, the PD-l transmembrane domain of a polypeptide provided herein is or comprises the amino acid sequence VGVVGGLLGSLVLLVWVLAVI (in three-letter code, Val-Gly-Val-Val-Gly-Gly-Leu-Leu-Gly-Ser-Leu-Val-Leu-Leu-Val-Trp-Val- Leu-Ala-Val-Ile) (SEQ ID NO:7).

In another c embodiment, the PD-l transmembrane domain of a polypeptide provided herein is or comprises the amino acid sequence FQTLVVGVVGGLLGSLVLLVWVLAVI (in three-letter code, Phe-Glu-Thr-Leu-Val-Val-Gly- Val-Val-Gly-Gly-Leu-Leu-Gly-Ser-Leu-Val-Leu-Leu-Val-Trp-Val-Leu-Ala-Val-Ile) (SEQ ID NO:8).

In another specific embodiment, the PD-l transmembrane domain of a polypeptide provided herein is or comprises the amino acid sequence FQTLVVGVVGGLLGSLVLLVWVLAVICSRAA (in three-letter code, Phe Gln Thr Leu Val Val Gly Val Val Gly Gly Leu Leu Gly Ser Leu Val Leu Leu Val Trp Val Leu Ala Val Ile Cys Ser Arg Ala Ala) (SEQ ID NO:11).

As exemplified by the CTLA-4 and PD-1 transmembrane domain sequences described herein (i.e., SEQ ID NO:1, SEQ ID NO:2, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:5, SEQ ID NO:6, SEQ ID NO:7, SEQ ID NO:8, SEQ ID NO:9, SEQ ID NO:10, and SEQ ID NO:11), the transmembrane domains described herein, in certain ments, comprise one or more amino acids from the extracellular domain and/or one or more amino acids from the intracellular domain of the protein from which they are derived (i.e., CTLA-4 or PD-l). In certain embodiments, the transmembrane domains described herein comprise 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, or 25 amino acids from the extracellular domain of the protein from which they are d (i.e., CTLA-4 or PD-l). In certain embodiments, the transmembrane domains described herein comprise 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, or 25 amino acids from the intracellular domain of the protein from which they are derived (i.e., CTLA-4 or PD-l). In n embodiments, the transmembrane domains described herein se (i) 1, 2, 3, 4, 5, 6, 7, 8, 9, , 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, or 25 amino acids from the extracellular domain of the protein from which they are derived (i.e., CTLA-4 or PD-l) and (ii) 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15,16,17,18,19, 20, 21, 22, 23, 24, or 25 amino acids from the ellular domain of the protein from which they are derived (i.e., CTLA-4 or PD-l).

In another specific embodiment, ed herein is a polypeptide that comprises a transmembrane domain, wherein the transmembrane domain is or comprises at least 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 or 21 consecutive amino acids sed in SEQ ID NO:1, SEQ ID NO:2, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:5, SEQ ID NO:6, SEQ ID NO:7, SEQ ID NO:8, SEQ ID NO:9, SEQ ID NO:10, or SEQ ID NOill. In another specific embodiment, provided herein is a polypeptide that comprises a transmembrane , wherein the transmembrane domain is at least 75%, at least 80%, at least 85%, at least 90%, or at least 95%, identical to SEQ ID NO:1, SEQ ID NO:2, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:5, SEQ ID NO:6, SEQ ID NO:7, SEQ ID NO:8, SEQ ID NO:9, SEQ ID NO:10, or SEQ ID NO:11. In another specific embodiment, the polypeptides ed herein comprise 1, 2, 3, 4, or 5 amino ons, e.g., conservative amino acid mutations (e.g., hydrophobic amino acid mutated to a different hydrophobic amino acid), in the transmembrane domain of the polypeptide.

In certain embodiments, provided herein is a nucleotide sequence that encodes one of the polypeptides disclosed herein. In a specific embodiment, provided herein is a nucleotide sequence that comprises a nucleotide sequence that encodes any of the amino acid sequences disclosed in SEQ ID NO:1, SEQ ID NO:2, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:5, SEQ ID NO:6, SEQ ID NO:7, SEQ ID NO:8, SEQ ID NO:9, SEQ ID NO:10, or SEQ ID NO:11. In another specific embodiment, provided herein is a nucleic acid that encodes a polypeptide described herein, wherein the nucleic acid comprises a nucleotide sequence that encodes at least , 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 or 21 consecutive amino acids disclosed in SEQ ID NO:1, SEQ ID NO:2, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:5, SEQ ID NO:6, SEQ ID NO:7, SEQ ID NO:8, SEQ ID NO:9, SEQ ID NO:10, or SEQ ID NO:11. In another specific embodiment, provided herein is a nucleic acid sequence that encodes a polypeptide that is at least 75%, at least 80%, at least 85%, at least 90%, or at least 95%, identical to SEQ ID NO:1, SEQ ID NO:2, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:5, SEQ ID NO:6, SEQ ID NO:7, SEQ ID NO:8, SEQ ID NO:9, SEQ ID NO:10, or SEQ ID NO:11.

In certain embodiments, the extracellular domain of any of the polypeptides described herein comprises a receptor, or a portion of a receptor, that binds to an antigen. The extracellular domain may be, e.g., a receptor, or a portion of a receptor, that binds to said antigen. In certain embodiments, the extracellular domain comprises, or is, an dy or an n-binding portion thereof. In a c embodiment, the ellular domain comprises, or is, a - chain Fv domain. The single-chain Fv domain can se, for example, a VL linked to VH by a flexible linker, wherein said VL and VH are from an antibody that binds said antigen.

The antigen to which the extracellular domain of the polypeptide binds can be any antigen of interest, e. g., an antigen on a tumor cell. The tumor cell may be, e.g., a cell in a solid tumor, or a cell of non-solid tumor, e. g., a cell of a blood cancer. In certain embodiments, the antigen is a tumor-associated n or a tumor-specific antigen. In a c embodiment, the associated antigen or tumor-specific antigen is, without limitation, Her2, prostate stem cell antigen , alpha-fetoprotein (AFP), carcinoembryonic antigen (CEA), cancer antigen-125 (CA-125), CA19-9, calretinin, MUC-l, lial membrane protein (EMA), epithelial tumor antigen (ETA), tyrosinase, melanoma-associated antigen (MAGE), CD34, CD45, CD99, CD117, granin, cytokeratin, desmin, glial fibrillary acidic protein (GFAP), gross cystic disease fluid protein (GCDFP-lS), HMB-45 antigen, protein melan-A (melanoma antigen recognized by T lymphocytes; MART-1), myo-D1, muscle-specific actin (MSA), neurofilament, neuron- specific enolase (NSE), placental alkaline phosphatase, synaptophysis, lobulin, thyroid transcription factor-1, the dimeric form of the pyruvate kinase isoenzyme type M2 (tumor M2- PK), CD19, CD22, CD27, CD30, CD70, GD2 (ganglioside G2), EGFRvIII (epidermal growth factor t III), sperm protein 17 (Spl7), mesothelin, PAP atic acid phosphatase), prostein, TARP (T cell receptor gamma alternate reading frame protein), Trp-p8, STEAPl (six- transmembrane epithelial antigen of the prostate 1), an abnormal ras protein, or an abnormal p53 n. In another specific embodiment, said tumor-associated antigen or tumor-specific antigen is integrin (va3 (CD61), galactin, K-Ras (V-Ki-ras2 Kirsten rat sarcoma viral oncogene), or Ral-B.

In certain ments, the ellular domain of the polypeptides described herein is joined to the transmembrane domain of the polypeptide by a linker, spacer or hinge polypeptide/peptide sequence, e. g., a CH2CH3 hinge sequence or a sequence from CD8, CD28, CTLA4, or PD-1.

In n embodiments, the intracellular domain of the ptides described herein is or comprises an intracellular domain of a protein that is expressed on the surface of T cells and triggers activation and/or proliferation of said T cells. In a specific embodiment, the intracellular domain is a CD35; intracellular ing domain. In another specific embodiment, the intracellular domain is from a lymphocyte receptor chain, a TCIVCD3 complex protein, an Fc or subunit, or an IL-2 receptor subunit.

In certain embodiments, the polypeptides provided herein additionally comprise one or more mulatory domains, e.g., as part of the ellular domain of the polypeptide. The one or more co-stimulatory domains can be, or can comprise, t limitation, one or more of a co-stimulatory CD27 polypeptide sequence, a co-stimulatory CD28 polypeptide sequence, a co-stimulatory 0X40 (CD134) polypeptide sequence, a co-stimulatory 4-1BB (CD137) polypeptide sequence, or, a co-stimulatory inducible T-cell costimulatory (ICOS) ptide sequence.

In a specific ment, a polypeptide provided herein comprises, in order, from N- terminus to C-terminus: (i) an antigen-binding domain (e.g., an antigen binding domain that binds an antigen on a tumor cell, e.g., an antigen on a tumor cell described above); (ii) a CD28 or CTLA4 hinge polypeptide sequence; (iii) a CTLA4 or PD-l transmembrane domain; (iv) a costimulatory domain; and (V) an ellular signaling . In a specific embodiment, the antigen-binding domain of the polypeptide binds to CD19.

In another specific embodiment, a polypeptide provided herein ses, in order, from N—terminus to C-terminus: (i) an antigen-binding domain (e.g., an antigen binding domain that binds an antigen on a tumor cell, e. g., an antigen on a tumor cell described above); (ii) a CH2CH3 hinge polypeptide sequence; (iii) a CTLA4 or PD-l transmembrane domain; (iv) a CD28 costimulatory domain; and (v) a CD35; intracellular signaling domain.

In another specific embodiment, a polypeptide provided herein comprises, in order, from N—terminus to C-terminus: (i) an antigen-binding domain (e.g., an antigen binding domain that binds an antigen on a tumor cell, e.g., an antigen on a tumor cell described above); (ii) a CD28 hinge polypeptide sequence; (iii) a CTLA4 or PD-l transmembrane domain; (iv) a 4-lBB costimulatory domain; and (v) a CD35; intracellular signaling domain.

In another specific embodiment, a polypeptide provided herein comprises, in order, from inus to C-terminus: (i) a single-chain Fv domain comprising a VL linked to VH by a , wherein said VL and VH are from an antibody that binds an antigen of st (e.g., an antigen on a tumor cell, e.g., an antigen on a tumor cell described above); (ii) a CD28 hinge polypeptide ce; (iii) a CTLA4 transmembrane domain; (iv) a CD28 costimulatory ; and (v) a CD35; ellular signaling domain.

In another specific embodiment, a polypeptide provided herein comprises, in order, from N—terminus to C-terminus: (i) a single-chain Fv domain comprising a VL linked to VH by a linker, wherein said VL and VH are from an antibody that binds an antigen of interest (e.g., an antigen on a tumor cell, e.g., an antigen on a tumor cell described above); (ii) a CTLA4 hinge polypeptide sequence; (iii) a CTLA4 transmembrane domain; (iv) a CD28 costimulatory domain; and (v) a CD35; intracellular signaling domain.

In another specific embodiment, a polypeptide provided herein comprises, in order, from N—terminus to C-terminus: (i) a single-chain Fv domain comprising a VL linked to VH by a linker, wherein said VL and VH are from an antibody that binds an antigen of interest (e.g., an antigen on a tumor cell, e.g., an antigen on a tumor cell described above); (ii) a CD28 hinge polypeptide sequence; (iii) a PD-l transmembrane domain; (iv) a CD28 costimulatory domain; and (V) a CD35; intracellular signaling domain.

In another specific ment, a polypeptide provided herein comprises, in order, from N—terminus to C-terminus: (i) a single-chain Fv domain comprising a VL linked to VH by a , wherein said VL and VH are from an antibody that binds an antigen of interest (e.g., an antigen on a tumor cell, e.g., an antigen on a tumor cell described ; (ii) a CTLA4 hinge polypeptide sequence; (iii) a PD-l transmembrane domain; (iv) a CD28 costimulatory domain; and (v) a CD35; intracellular signaling domain.

In another c embodiment, a ptide provided herein comprises, in order, from N—terminus to C-terminus: (i) an antigen-binding domain (e.g., an antigen binding domain that binds an antigen on a tumor cell, e.g., an antigen on a tumor cell described above); (ii) a PD-l hinge polypeptide sequence; (iii) a CTLA4 or PD-l transmembrane domain; (iv) a costimulatory ; and (v) an intracellular signaling domain.

In another specific embodiment, a polypeptide ed herein comprises, in order, from N—terminus to C-terminus: (i) a single-chain Fv domain comprising a VL linked to VH by a linker, wherein said VL and VH are from an dy that binds an antigen of interest (e.g., an antigen on a tumor cell, e.g., an antigen on a tumor cell described above); (ii) a PD-l hinge polypeptide sequence; (iii) a CTLA4 transmembrane domain; (iv) a CD28 costimulatory domain; and (v) a CD35; intracellular signaling domain.

In another specific embodiment, a polypeptide provided herein comprises, in order, from N—terminus to C-terminus: (i) a single-chain Fv domain sing a VL linked to VH by a linker, wherein said VL and VH are from an dy that binds an antigen of interest (e.g., an n on a tumor cell, e.g., an antigen on a tumor cell described above); (ii) a PD-l hinge ptide sequence; (iii) a PD-l transmembrane domain; (iv) a CD28 costimulatory domain; and (v) a CD35; intracellular signaling domain.

In another aspect, provided herein are T lymphocytes, e. g., T cells, that comprise, e.g., s on their cell e, a membrane-bound polypeptide, wherein said polypeptide comprises (i) a transmembrane domain comprising the transmembrane domain from CTLA4 or PD-l, or a portion thereof, (ii) an intracellular domain of an endogenous protein expressed on the surface of lymphocytes and that triggers the activation and/or proliferation of said lymphocytes, and (iii) an extracellular domain that binds to an antigen of interest, wherein if the transmembrane domain is from CTLA4, the ellular domain and extracellular domain (optionally excluding a CTLA4 linker) of said polypeptide are not from CTLA4; and if the transmembrane domain is from PD-l, the intracellular domain and extracellular domain of said polypeptide are not from PD-l. In a specific embodiment, the polypeptide is a chimeric antigen receptor (CAR).

In a specific embodiment, ed herein is a T lymphocyte comprising a polypeptide that comprises a transmembrane domain from CTLA4, n the CTLA4 transmembrane domain is the polypeptide sequence encoded by exon 3 of a human CTLA4 gene (e.g., GenBank Accession No. NM_005214.4 (CTLA4 xic T-lymphocyte-associated protein 4 (Homo sapiens); Gene ID: 1493)).

In another specific embodiment, ed herein is a T lymphocyte comprising a polypeptide that comprises a embrane domain from CTLA4, wherein the CTLA4 transmembrane domain is or comprises the amino acid sequence PEPCPDSDFLLWILAAVSSGLFFYSFLLTAVSLSKM (in three-letter code, Pro-Glu-Pro-Cys- Pro-Asp-Ser-Asp-Phe-Leu-Leu-Trp-Ile-Leu-Ala-Ala-Val-Ser-Ser-Gly-Leu-Phe-Phe-Tyr-Ser- Phe-Leu-Leu-Thr-Ala-Val-Ser-Leu-Ser-Lys-Met) (SEQ ID N021).

In another specific embodiment, ed herein is a T lymphocyte sing a polypeptide that ses a transmembrane domain from CTLA4, wherein the CTLA4 transmembrane domain is or comprises the polypeptide sequence encoded by nucleotides 610- 722 of GenBank Accession No. NM_005214.4 (CTLA4 cytotoxic T-lymphocyte-associated protein 4 (Homo sapiens); Gene ID: 1493).

In another specific embodiment, provided herein is a T lymphocyte comprising a polypeptide that comprises a transmembrane domain from CTLA4, wherein the CTLA4 transmembrane domain is or comprises the amino acid sequence PDSDFLLWILAAVSSGLFFYSFLLTAVSL (in three-letter code, Pro-Asp-Ser-Asp-Phe-Leu- Leu-Trp-Ile-Leu-Ala-Ala-Val-Ser-Ser-Gly-Leu-Phe-Phe-Tyr-Ser—Phe-Leu-Leu-Thr-Ala-Val- Ser-Leu) (SEQ ID N02).

In another c embodiment, ed herein is a T lymphocyte comprising a polypeptide that comprises a transmembrane domain from CTLA4, wherein the CTLA4 transmembrane domain is or comprises the polypeptide sequence encoded by nucleotides 63 6- 699 of GenBank ion No. NM_005214.4 (CTLA4 xic T-lymphocyte-associated protein 4 (Homo sapiens); Gene ID: 1493).

In another specific embodiment, ed herein is a T lymphocyte comprising a ptide that comprises a transmembrane domain from CTLA4, wherein the CTLA4 transmembrane domain is or ses the amino acid sequence FLLWILAAVSSGLFFYSFLLTAV (in three-letter code, Phe-Leu-Leu-Trp-Ile-Leu-Ala-Ala- Val-Ser-Ser-Gly-Leu-Phe-Phe-Tyr-Ser-Phe-Leu-Leu-Thr-Ala-Val) (SEQ ID N03).

In another specific embodiment, provided herein is a T lymphocyte comprising a polypeptide that comprises a transmembrane domain from CTLA4, wherein the CTLA4 transmembrane domain is or comprises the polypeptide sequence FLLWILAAVSSGLFFYSFLLT (in three-letter code, Phe-Leu-Leu-Trp-Ile-Leu-Ala-Ala-Val- Ser-Ser-Gly-Leu-Phe-Phe-Tyr—Ser-Phe-Leu-Leu-Thr) (SEQ ID NO:4).

In another specific embodiment, provided herein is a T lymphocyte comprising a polypeptide that comprises a transmembrane domain from CTLA4, wherein the CTLA4 transmembrane domain is or comprises the polypeptide sequence FLLWILVAVSLGLFFYSFLVSAVSLS (in three-letter code, u-Leu-Trp-Ile-Leu-Val- Ala-Val-Ser-Leu-Gly-Leu-Phe-Phe-Tyr-Ser-Phe-Leu-Val-Ser-Ala-Val-Ser-Leu-Ser) (SEQ ID NO:5).

In r specific embodiment, provided herein is a T lymphocyte comprising a polypeptide that comprises a transmembrane domain from CTLA4, wherein the CTLA4 transmembrane domain is or comprises the polypeptide sequence LGIGNGTQIYVIDPEPSPDSDFLLWILAAVSSGLFFYSFLLTAVSLSKM (in three-letter code, Leu Gly Ile Gly Asn Gly Thr Gln Ile Tyr Val Ile Asp Pro Glu Pro Ser Pro Asp Ser Asp Phe Leu Leu Trp Ile Leu Ala Ala Val Ser Ser Gly Leu Phe Phe Tyr Ser Phe Leu Leu Thr Ala Val Ser Leu Ser Lys Met) (SEQ ID NO:9).

In another specific embodiment, provided herein is a T lymphocyte comprising a ptide that comprises a transmembrane domain from CTLA4, wherein the CTLA4 transmembrane domain is or comprises the polypeptide sequence FLLWILAAVSSGLFFYSFLLTAVSLSKM (in three-letter code, Phe Leu Leu Trp Ile Leu Ala Ala Val Ser Ser Gly Leu Phe Phe Tyr Ser Phe Leu Leu Thr Ala Val Ser Leu Ser Lys Met) (SEQ ID NO: 10).

In another specific embodiment, provided herein is a T lymphocyte comprising a polypeptide that comprises a transmembrane domain from PD-l, wherein the PD-l transmembrane domain is or comprises the amino acid sequence VGGLLGSLVLLVWVLAVICSRAA (in three-letter code, Thr-Leu-Val-Val-Gly-Val- Val-Gly-Gly-Leu-Leu-Gly-Ser-Leu-Val-Leu-Leu-Val-Trp-Val-Leu-Ala-Val-Ile-Cys-Ser-Arg- Ala-Ala) (SEQ ID NO:6).

In another specific embodiment, provided herein is a T lymphocyte comprising a polypeptide that ses a transmembrane domain from PD-l, wherein the PD-l transmembrane domain is or comprises the amino acid sequence VGVVGGLLGSLVLLVWVLAVI (in three-letter code, Val-Gly-Val-Val-Gly-Gly-Leu-Leu- Gly-Ser-Leu-Val-Leu-Leu-Val-Trp-Val-Leu-Ala-Val-Ile) (SEQ ID NO:7).

In another specific embodiment, provided herein is a T lymphocyte comprising a polypeptide that comprises a transmembrane domain from PD-l, wherein the PD-l transmembrane domain is or ses the amino acid sequence FQTLVVGVVGGLLGSLVLLVWVLAVI (in three-letter code, Phe-Glu-Thr-Leu-Val-Val-Gly- Val-Val-Gly-Gly-Leu-Leu-Gly-Ser-Leu-Val-Leu-Leu-Val-Trp-Val-Leu-Ala-Val-Ile) (SEQ ID NO:8).

In another specific ment, provided herein is a T lymphocyte sing a polypeptide that comprises a transmembrane domain from PD-l, wherein the PD-l embrane domain is or comprises the amino acid sequence FQTLVVGVVGGLLGSLVLLVWVLAVICSRAA (in three-letter code, Phe Gln Thr Leu Val Val Gly Val Val Gly Gly Leu Leu Gly Ser Leu Val Leu Leu Val Trp Val Leu Ala Val Ile Cys Ser Arg Ala Ala) (SEQ ID NO: 1 l).

In certain embodiments, a tide sequence expressed or encoded by a T lymphocyte provided herein (i.e., a T lymphocyte comprising a polypeptide described herein) ses a nucleotide sequence that encodes any of the amino acid sequences disclosed in SEQ ID NO:1, SEQ ID NO:2, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:5, SEQ ID NO:6, SEQ ID NO:7, SEQ ID NO:8, SEQ ID NO:9, SEQ ID NO:lO, or SEQ ID NO:ll.

In another c embodiment, provided herein is a T lymphocyte comprising a polypeptide that comprises a transmembrane domain, wherein the transmembrane domain is or comprises at least 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 or 21 utive amino acids disclosed in SEQ ID NO:1, SEQ ID NO:2, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:5, SEQ ID NO:6, SEQ ID NO:7, SEQ ID NO:8, SEQ ID NO:9, SEQ ID NO:10, or SEQ ID NO:ll. In certain embodiments, provided herein is a T lymphocyte comprising a nucleic acid that encodes a ptide described herein, wherein the nucleic acid comprises a nucleotide sequence that encodes at least 10, ll, 12, l3, 14, 15, l6, l7, 18, 19,20 or 21 consecutive amino acids sed in SEQ ID NO:1, SEQ ID NO:2, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:5, SEQ ID NO:6, SEQ ID NO:7, SEQ ID NO:8, SEQ ID NO:9, SEQ ID NO:10, or SEQ ID NO:ll.

In certain embodiments, the extracellular domain of a ptide sed by the T lymphocytes provided herein comprises a or, or a portion of a receptor, that binds to an antigen of interest. The extracellular domain may be, e.g., a receptor, or a portion of a receptor, that binds to said antigen. In certain embodiments, the ellular domain comprises, or is, an antibody or an n-binding portion thereof. In c embodiments, the extracellular domain comprises, or is, a single-chain Fv domain. The single-chain Fv domain can comprise, for example, a VL linked to VH by a flexible linker, wherein said VL and VH are from an antibody that binds said antigen.

The antigen to which the extracellular domain of the polypeptide expressed by a T lymphocyte provided herein binds, and therefore to which the T cell is directed by the polypeptide, can be any antigen of interest, e.g., an antigen on a tumor cell. The tumor cell may be, e.g., a cell in a solid tumor, or a cell of a non-solid tumor, e.g., a cell of a blood cancer. In certain embodiments, the antigen is a tumor-associated antigen or a tumor-specific antigen. In certain embodiments, the antigen is one or more of Kappa, Lambda, CD19, CD22, CD27, CD30, CD70, GD2, HER2, CEA, EGFRvIII, Sperm Protein17, PSCA, mesothelin, PAP (prostatic acid phosphatase), prostein, TARP (T cell receptor gamma alternate reading frame protein), Trp-p8, STEAP1 (six-transmembrane epithelial antigen of the te 1), and/or MUC-l. In various specific embodiments, without limitation, the tumor-associated antigen or tumor-specific antigen is Her2, prostate stem cell antigen , alpha-fetoprotein (AFP), carcinoembryonic antigen (CEA), cancer antigen-125 (CA-125), CA19-9, inin, MUC-l, epithelial membrane protein (EMA), epithelial tumor antigen (ETA), tyrosinase, melanoma-associated antigen (MAGE), CD34, CD45, CD99, CD117, chromogranin, cytokeratin, desmin, glial fibrillary acidic protein (GFAP), gross cystic disease fluid n (GCDFP-15), HMB-45 antigen, protein melan-A (melanoma antigen recognized by T cytes; MART-1), myo-D1, muscle-specific actin (MSA), neurofilament, neuron-specific enolase (NSE), placental alkaline phosphatase, synaptophysis, thyroglobulin, thyroid transcription factor-1, the dimeric form of the pyruvate kinase isoenzyme type M2 (tumor M2-PK), an abnormal ras protein, or an abnormal p53 protein.

In another specific ment, said tumor-associated antigen or tumor-specific antigen is integrin (va3 (CD61), galactin, K-Ras (V-Ki-ras2 Kirsten rat sarcoma viral ne), or Ral-B.

In certain ments, the extracellular domain of a polypeptide expressed by a T lymphocyte described herein is joined to said transmembrane domain of the polypeptide by a linker, spacer or hinge polypeptide sequence, e.g., a sequence from CD8, CD28, CTLA4 or PD-1.

In certain embodiments, the intracellular domain of a polypeptide expressed by a T lymphocyte bed herein is or comprises an intracellular domain of a protein that is normally expressed on the surface of T cells and which triggers activation and/or proliferation of said T cells. In a specific embodiment, the intracellular domain is a CD35; intracellular signaling domain. In another embodiment, the ellular domain is from a cyte receptor chain, a TCIVCD3 complex protein, an Fc receptor subunit or an IL-2 or subunit.

In n embodiments, a polypeptide expressed by a T lymphocyte described herein additionally comprises one or more co-stimulatory domains, e.g., as part of the intracellular domain of the polypeptide. The one or more co-stimulatory domains can be, or se, one or more of a mulatory CD27 polypeptide sequence, a co-stimulatory CD28 polypeptide sequence, a mulatory 0X40 (CD134) ptide sequence, a co-stimulatory 4-1BB (CD137) polypeptide sequence, or a mulatory inducible T-cell costimulatory (ICOS) polypeptide sequence.

In a specific embodiment, the T lymphocytes provided herein express or comprise a polypeptide that comprises, in order, from N—terminus to C-terminus: (i) an antigen-binding domain (e.g., an antigen binding domain that binds an antigen on a tumor cell, e.g., an antigen on a tumor cell described above); (ii) a CD28 or CTLA4 hinge ptide sequence; (iii) a CTLA4 or PD-l transmembrane domain; (iv) a costimulatory domain; and (v) an intracellular signaling domain. In a specific embodiment, the antigen-binding domain of the polypeptide binds to CD19.

In a specific embodiment, the T lymphocytes provided herein express or comprise a polypeptide that comprises, in order, from N—terminus to C-terminus: (i) an antigen-binding domain (e.g., an antigen binding domain that binds an antigen on a tumor cell, e.g., an antigen on a tumor cell described above); (ii) a CH2CH3 hinge ptide sequence; (iii) a CTLA4 or PD- 1 embrane domain; (iv) a CD28 ulatory domain; and (V) a CD35; intracellular signaling domain. In a specific embodiment, the antigen-binding domain of the polypeptide binds to HER2.

In a c embodiment, the T lymphocytes provided herein express or comprise a polypeptide that comprises, in order, from inus to C-terminus: (i) an antigen-binding domain (e.g., an antigen binding domain that binds an n on a tumor cell, e.g., an antigen on a tumor cell described above); (ii) a CH2CH3 hinge polypeptide sequence; (iii) a CTLA4 or PD- 1 transmembrane domain; (iv) a CD28 costimulatory domain; and (v) a CD35; intracellular ing domain. In a specific embodiment, the n-binding domain of the polypeptide binds to HER2.

In another specific embodiment, the T lymphocytes provided herein express or comprise a polypeptide that ses, in order, from N—terminus to C-terminus: (i) a single-chain Fv domain comprising a VL linked to VH by a , wherein said VL and VH are from an antibody that binds an antigen of interest (e.g., an antigen on a tumor cell, e.g., an antigen on a tumor cell described above); (ii) a CD28 hinge polypeptide sequence; (iii) a CTLA4 transmembrane domain; (iv) a CD28 costimulatory domain; and (v) a CD35; intracellular signaling domain.

In another specific embodiment, the T lymphocytes provided herein express or comprise a polypeptide that comprises, in order, from N—terminus to C-terminus: (i) a single-chain Fv domain comprising a VL linked to VH by a linker, wherein said VL and VH are from an antibody that binds an antigen of interest (e.g., an antigen on a tumor cell, e.g., an antigen on a tumor cell described above); (ii) a CTLA4 hinge polypeptide sequence; (iii) a CTLA4 embrane domain; (iv) a CD28 costimulatory domain; and (v) a CD35; intracellular signaling domain.

In another specific embodiment, the T lymphocytes ed herein express or comprise a polypeptide that comprises, in order, from N—terminus to C-terminus: (i) a single-chain Fv domain comprising a VL linked to VH by a linker, wherein said VL and VH are from an dy that binds an antigen of interest (e.g., an antigen on a tumor cell, e.g., an antigen on a tumor cell described above); (ii) a CD28 hinge polypeptide sequence; (iii) a PD-l transmembrane domain; (iv) a CD28 costimulatory domain; and (V) a CD35; intracellular signaling domain.

In another specific embodiment, the T lymphocytes provided herein express or comprise a polypeptide that comprises, in order, from inus to inus: (i) a single-chain Fv domain comprising a VL linked to VH by a linker, wherein said VL and VH are from an antibody that binds an antigen of interest (e.g., an antigen on a tumor cell, e.g., an antigen on a tumor cell described above); (ii) a CTLA4 hinge polypeptide sequence; (iii) a PD-l transmembrane domain; (iv) a CD28 costimulatory domain; and (v) a CD35; intracellular signaling domain.

In another specific embodiment, the T lymphocytes ed herein express or comprise a polypeptide that comprises, in order, from N—terminus to C-terminus: (i) an antigen-binding domain (e.g., an n binding domain that binds an antigen on a tumor cell, e.g., an antigen on a tumor cell bed above); (ii) a PD-l hinge polypeptide sequence; (iii) a CTLA4 or PD-l transmembrane domain; (iv) a costimulatory domain; and (v) an intracellular ing domain.

In another specific embodiment, the T lymphocytes provided herein express or comprise a polypeptide that comprises, in order, from inus to C-terminus: (i) a single-chain Fv domain comprising a VL linked to VH by a linker, wherein said VL and VH are from an antibody that binds an antigen of interest (e.g., an antigen on a tumor cell, e.g., an antigen on a tumor cell bed above); (ii) a PD-l hinge polypeptide sequence; (iii) a CTLA4 transmembrane domain; (iv) a CD28 costimulatory domain; and (v) a CD35; intracellular signaling domain.

In another specific embodiment, the T lymphocytes provided herein express or comprise a polypeptide that comprises, in order, from N—terminus to C-terminus: (i) a single-chain Fv domain comprising a VL linked to VH by a linker, wherein said VL and VH are from an antibody that binds an antigen of interest (e.g., an n on a tumor cell, e.g., an antigen on a tumor cell described above); (ii) a PD-l hinge polypeptide sequence; (iii) a PD-l transmembrane domain; (iv) a CD28 costimulatory ; and (v) a CD35; intracellular signaling domain.

In a specific embodiment, the T lymphocytes provided herein that express or comprise one or more of the polypeptides provided herein, become activated or stimulated to proliferate when said polypeptide binds to the antigen to which the antigen binding domain or single-chain Fv domain of the polypeptide is specific. In r specific ment, the T lymphocytes ed herein that express or comprise one or more of the ptides provided , kill cells that express or comprise the antigen to which the antigen binding domain or single-chain Fv domain of the polypeptide is specific when the T cytes come in contact with said antigen- expressing cells.

In another , provided herein are methods of ng an dual having a disease or disorder, wherein the disease or disorder is characterized, or is characterizable, by cells expressing an antigen, comprising administering to the individual one or more of the T cytes provided herein, i.e., T lymphocytes that comprise or express a polypeptide described herein. 4. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 depicts expression of CARs by T cells three days after transduction of the T cells with iral vectors that s the CARS.

Figure 2 depicts eukin-2 (IL-2) production by CAR T cells (i) in the resting state (first bar), (ii) after exposure to anti-CD28 (second bar); (iii) after exposure to 0.25 ug/ml HER2- Fc; (iv) after exposure to 0.5 ug/ml HER2-Fc; and (v) after exposure to 1.0 ug/ml HER2-Fc.

Figure 3 depicts GM-CSF production by CAR T cells (i) in the resting state (first bar), (ii) after exposure to aCD28 (second bar); (iii) after exposure to 0.25 ug/ml HER2-Fc; (iv) after exposure to 0.5 ug/ml HER2-Fc; and (v) after exposure to 1.0 ug/ml HER2-Fc.

Figure 4 depicts interferon-gamma (IFN—y) production by CAR T cells (i) in the resting state (first bar), (ii) after exposure to aCD28 (second bar); (iii) after exposure to 0.25 ug/ml HER2-Fc; (iv) after exposure to 0.5 ug/ml HER2-Fc; and (v) after exposure to 1.0 ug/ml HER2- Figure 5 depicts intracellular tumor necrosis factor alpha (TNF-(x) production by CAR T cells after multiple rounds of exposure to 1.0 ug/ml HER2-Fc.

Figure 6 depicts percentages of CAR T cells the express certain anti-HER2 CARs or a mock control in the absence (top ) and presence (bottom panels) of stimulation with HER2-Fc. A) Percentages of anti-HER2 CAR T cells expressing Mock, 8TMC, or HER2-28TM28C. B) Percentages of anti-HER2 CAR T cells expressing HER2-CTLA4TM28C or HER2lBBTM28C.

Figure 7 s expression of CARs by T cells eleven days after transduction of the T cells with lentiviral vectors that express the CARS.

Figure 8 depicts IL-2, TNF-(x, and IFN—y production by CAR T cells (i) in the resting state, (ii) after exposure to 0.25, 0.5, or 1.0 ug/ml HER2-Fc; or (iii) after CD3/CD28 ligation.

First (leftmost) bar in each group: mock-transduced cells (no CAR expressed); second bar in each group: cells transduced with CAR designated HER-PDlTM-CD28-CD3; third bar in each group: cells transduced with CAR designated HER-CTLA4(l 89)TM-4lBB-CD3; fourth bar in each group: cells transduced with CAR designated HER-PDlTM-4lBB-CD3; fifth (rightmost) bar in each group: cells transduced with CAR designated HER2-CD28TM-CD28-CD3.

Figure 9 s GM-CSF, Granzyme B, and IL-l3 production by CAR T cells (i) in the resting state, (ii) after exposure to 0.25, 0.5, or 1.0 ug/ml HER2-Fc; or (iii) after CD3/CD28 ligation. First (leftmost) bar in each group: ransduced cells (no CAR expressed); second bar in each group: cells transduced with CAR ated HER-PDlTM-CD28-CD3; third bar in each group: cells transduced with CAR ated HER-CTLA4(l 89)TM-4lBB-CD3; fourth bar in each group: cells transduced with CAR ated HER-PDlTM-4lBB-CD3; fifth (rightmost) bar in each group: cells transduced with CAR designated HER2-CD28TM-CD28-CD3.

Figure 10 depicts live T cell counts following stimulation with HER2-Fc. First (leftmost) bar: cells transduced with CAR designated HER2-CD28TM-CD28-CD3; second bar: cells transduced with CAR designated lTM-CD28-CD3; third bar: cells transduced with CAR designated HER-CTLA4(l 4lBB-CD3; fourth bar: cells transduced with CAR designated HER-PD lTM-4lBB-CD3; fifth (rightmost) bar: mock-transduced cells (no CAR expressed).

. DETAILED DESCRIPTION In one aspect, provided herein are polypeptides, e.g., chimeric antigen receptors (see, e.g., Eshhar, US. Patent No. 7,741,465), that can be expressed by immune system cells, e.g., T lymphocytes (T cells), are ne-bound in such immune system cells, and which comprise a transmembrane domain from an immune system protein that normally transmits an inhibitory signal to such immune system cells, e. g., a transmembrane domain from CTLA4 (Cytotoxic TLymphocyte Antigen 4 or Cytotoxic T-Lymphocyte Associated protein 4) or PD-l (Programmed Cell Death-l). Further provided herein are nucleic acid sequences encoding the ptides described herein. Also ed herein are immune system cells, e.g., T lymphocytes (e.g., T cells), sing such polypeptides.

The polypeptides provided herein comprise an extracellular domain that binds to an antigen, e. g., an antigen on a cell, a transmembrane domain, and an intracellular (cytoplasmic) signaling domain that transmits a primary activation signal to an immune cell. When the polypeptides provided herein are sed on the surface of, e.g., a T lymphocyte, and when the ellular domain of the CAR binds to an antigen, the intracellular signaling domain transmits a signal to the T lymphocyte to activate and/or proliferate, and, if the antigen is present on a cell surface, to kill the cell expressing the antigen. Because T lymphocytes require two signals in order to fillly activate, a primary activation signal and a costimulatory signal, in certain embodiments, the polypeptides described herein can se a costimulatory domain such that binding of the antigen to the extracellular domain results in transmission of both a primary activation signal and a costimulatory signal.

The polypeptides, e.g., CARs, provided herein are fianctional, immune stimulatory polypeptides that comprise a transmembrane domain from a T cell co-inhibitory n, e.g., CTLA4 or PD-l. In one aspect, provided herein is a polypeptide comprising (i) a transmembrane domain from CTLA4 or PD-l, (ii) an intracellular domain (e.g., cytoplasmic domain) of an endogenous n expressed on the e of lymphocytes and that triggers the tion and/or proliferation of said lymphocytes, and (iii) an extracellular domain that binds to an antigen, wherein if the transmembrane domain is from CTLA4, the intracellular domain and extracellular domain of said polypeptide are not from CTLA4; and if the transmembrane domain is from PD-l, the intracellular domain and extracellular domain of said polypeptide are not from PD-l. In a specific embodiment, a T cyte expressing a polypeptide described herein is activated or stimulated to proliferate when said polypeptide binds to an antigen to which the polypeptide is specific (i.e., an antigen that is bound by the extracellular domain of the polypeptide). In a specific embodiment, the ptide, when expressed on the surface of a T lymphocyte, directs the T lymphocyte to kill a cell expressing said antigen.

In certain ments the polypeptides provided herein comprise a transmembrane domain from CTLA4 or PD-l, or a portion thereof, wherein the CTLA4 or PD-l transmembrane domain is from a ian CTLA4 or PD-l, e.g., human, primate, or rodent, e. g., murine CTLA4 or PD-l. In a specific embodiment, the embrane domain does not se amino acids from the intracellular domain, extracellular domain, or either the intracellular or extracellular domain of CTLA4 or PD-l. Specific, non-limiting examples of CTLA4 or PD-l transmembrane domain sequences are provided below.

In a specific ment, provided herein is a polypeptide comprising a transmembrane domain from CTLA4, wherein the CTLA4 transmembrane domain is the polypeptide sequence encoded by exon 3 of a human ctla4 gene (e.g., GenBank Accession No. NM_005214.4 (CTLA4 cytotoxic T-lymphocyte-associated protein 4 (Homo sapiens); Gene ID: .

In another specific embodiment, the CTLA4 transmembrane domain of a polypeptide provided herein is or ses the amino acid sequence PEPCPDSDFLLWILAAVSSGLFFYSFLLTAVSLSKM (in three-letter code, Pro-Glu-Pro-Cys- Pro-Asp-Ser-Asp-Phe-Leu-Leu-Trp-Ile-Leu-Ala-Ala-Val-Ser-Ser-Gly-Leu-Phe-Phe-Tyr-Ser- Phe-Leu-Leu-Thr-Ala-Val-Ser-Leu-Ser-Lys-Met) (SEQ ID NO:l).

In another specific embodiment, the CTLA4 transmembrane domain of a polypeptide ed herein is or comprises the polypeptide sequence encoded by nucleotides 610-722 of GenBank Accession No. NM_005214.4 (CTLA4 xic T-lymphocyte-associated protein 4 (Homo sapiens); Gene ID: 1493).

In another specific embodiment, the CTLA4 transmembrane domain of a polypeptide provided herein is or comprises the amino acid sequence PDSDFLLWILAAVSSGLFFYSFLLTAVSL (in three-letter code, Pro-Asp-Ser-Asp-Phe-Leu- Leu-Trp-Ile-Leu-Ala-Ala-Val-Ser-Ser-Gly-Leu-Phe-Phe-Tyr-Ser-Phe-Leu-Leu-Thr-Ala-Val- Ser-Leu) (SEQ ID NO:2).

In another specific embodiment, the CTLA4 transmembrane domain of a polypeptide provided herein is or comprises the ptide sequence encoded by tides 636-699 of GenBank Accession No. NM_005214.4 (CTLA4 xic T-lymphocyte-associated protein 4 (Homo sapiens); Gene ID: 1493).

In another specific embodiment, the CTLA4 transmembrane domain of a polypeptide provided herein is or comprises the amino acid sequence FLLWILAAVSSGLFFYSFLLTAV (in three-letter code, Phe-Leu-Leu-Trp-Ile-Leu-Ala-Ala-Val-Ser-Ser-Gly-Leu-Phe-Phe-Tyr-Ser- Phe-Leu-Leu-Thr-Ala-Val) (SEQ ID NO:3).

In another specific embodiment, the CTLA4 transmembrane domain of a polypeptide provided herein is or ses the polypeptide sequence FLLWILAAVSSGLFFYSFLLT (in three-letter code, Phe-Leu-Leu-Trp-Ile-Leu-Ala-Ala-Val-Ser-Ser-Gly-Leu-Phe-Phe-Tyr-Ser- Phe-Leu-Leu-Thr) (SEQ ID NO:4).

In r c embodiment, the CTLA4 transmembrane domain of a polypeptide provided herein is or comprises the polypeptide sequence VAVSLGLFFYSFLVSAVSLS (in three-letter code, Phe-Leu-Leu-Trp-Ile-Leu-Val- Ala-Val-Ser-Leu-Gly-Leu-Phe-Phe-Tyr-Ser-Phe-Leu-Val-Ser-Ala-Val-Ser-Leu-Ser) (SEQ ID NO:5).

In another specific embodiment, the CTLA4 transmembrane domain of a polypeptide provided herein is or comprises the polypeptide sequence LGIGNGTQIYVIDPEPSPDSDFLLWILAAVSSGLFFYSFLLTAVSLSKM (in three-letter code, Leu Gly Ile Gly Asn Gly Thr Gln Ile Tyr Val Ile Asp Pro Glu Pro Ser Pro Asp Ser Asp Phe Leu Leu Trp Ile Leu Ala Ala Val Ser Ser Gly Leu Phe Phe Tyr Ser Phe Leu Leu Thr Ala Val Ser Leu Ser Lys Met) (SEQ ID NO:9).

In another specific embodiment, the CTLA4 transmembrane domain of a polypeptide provided herein is or comprises the ptide sequence AAVSSGLFFYSFLLTAVSLSKM (in three-letter code, Phe Leu Leu Trp Ile Leu Ala Ala Val Ser Ser Gly Leu Phe Phe Tyr Ser Phe Leu Leu Thr Ala Val Ser Leu Ser Lys Met) (SEQ ID NO: 10).

In r specific embodiment, the PD-l transmembrane domain of a ptide provided herein is or ses the amino acid sequence TLVVGVVGGLLGSLVLLVWVLAVICSRAA (in three-letter code, Thr-Leu-Val-Val-Gly-Val- Val-Gly-Gly-Leu-Leu-Gly-Ser-Leu-Val-Leu-Leu-Val-Trp-Val-Leu-Ala-Val-Ile-Cys-Ser-Arg- Ala-Ala) (SEQ ID NO:6).

In another specific embodiment, the PD-l transmembrane domain of a polypeptide provided herein is or comprises the amino acid sequence VGVVGGLLGSLVLLVWVLAVI (in three-letter code, Val-Gly-Val-Val-Gly-Gly-Leu-Leu-Gly-Ser-Leu-Val-Leu-Leu-Val-Trp-Val- Leu-Ala-Val-Ile) (SEQ ID NO:7).

In another specific embodiment, the PD-l transmembrane domain of a ptide provided herein is or comprises the amino acid sequence FQTLVVGVVGGLLGSLVLLVWVLAVI (in three-letter code, Phe-Glu-Thr-Leu-Val-Val-Gly- Val-Val-Gly-Gly-Leu-Leu-Gly-Ser-Leu-Val-Leu-Leu-Val-Trp-Val-Leu-Ala-Val-Ile) (SEQ ID NO:8).

In r specific embodiment, the PD-l transmembrane domain of a polypeptide provided herein is or comprises the amino acid sequence FQTLVVGVVGGLLGSLVLLVWVLAVICSRAA (in three-letter code, Phe Gln Thr Leu Val Val Gly Val Val Gly Gly Leu Leu Gly Ser Leu Val Leu Leu Val Trp Val Leu Ala Val Ile Cys Ser Arg Ala Ala) (SEQ ID NO:11).

As exemplified by the CTLA-4 and PD-1 transmembrane domain ces described herein (i.e., SEQ ID NO:1, SEQ ID NO:2, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:5, SEQ ID NO:6, SEQ ID NO:7, SEQ ID NO:8, SEQ ID NO:9, SEQ ID NO:10, and SEQ ID NO:11), the transmembrane domains described herein, in certain embodiments, comprise one or more amino acids from the ellular domain and/or one or more amino acids from the intracellular domain of the protein from which they are derived (i.e., CTLA-4 or PD-l). In certain ments, the transmembrane domains described herein comprise 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, or 25 amino acids from the extracellular domain of the protein from which they are derived (i.e., CTLA-4 or PD-l). In certain embodiments, the embrane domains described herein comprise 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, or 25 amino acids from the intracellular domain of the protein from which they are derived (i.e., CTLA-4 or PD-l). In certain embodiments, the transmembrane domains bed herein comprise (i) 1, 2, 3, 4, 5, 6, 7, 8, 9, , 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, or 25 amino acids from the extracellular domain of the protein from which they are derived (i.e., CTLA-4 or PD-l) and (ii) 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15,16,17,18,19, 20, 21, 22, 23, 24, or 25 amino acids from the intracellular domain of the n from which they are derived (i.e., CTLA-4 or PD-l).

In another specific embodiment, provided herein is a polypeptide that comprises a transmembrane domain, wherein the transmembrane domain is or ses at least 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 or 21 utive amino acids disclosed in SEQ ID NO:1, SEQ ID NO:2, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:5, SEQ ID NO:6, SEQ ID NO:7, SEQ ID NO:8, SEQ ID NO:9, SEQ ID NOilO, or SEQ ID NOill. In another specific embodiment, provided herein is a polypeptide that comprises a transmembrane domain, wherein the transmembrane domain is at least 75%, at least 80%, at least 85%, at least 90%, or at least 95%, identical to SEQ ID NO:1, SEQ ID NO:2, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:5, SEQ ID NO:6, SEQ ID NO:7, SEQ ID NO:8, SEQ ID NO:9, SEQ ID NO:10, or SEQ ID NO:11.

In certain embodiments, provided herein is a nucleotide sequence that encodes one of the polypeptides disclosed herein. In a specific embodiment, provided herein is a nucleotide sequence that comprises a tide sequence that encodes any of the amino acid sequences disclosed in SEQ ID NO:1, SEQ ID NO:2, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:5, SEQ ID NO:6, SEQ ID NO:7, SEQ ID NO:8, SEQ ID NO:9, SEQ ID NO:10, or SEQ ID NO:11. In another specific embodiment, provided herein is a nucleic acid that encodes a polypeptide bed herein, wherein the c acid comprises a nucleotide sequence that encodes at least , 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 or 21 utive amino acids disclosed in SEQ ID NO:1, SEQ ID NO:2, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:5, SEQ ID NO:6, SEQ ID NO:7, SEQ ID NO:8, SEQ ID NO:9, SEQ ID NO:10, or SEQ ID NO:11. In another specific ment, provided herein is a nucleic acid sequence that encodes a polypeptide that is at least 75%, at least 80%, at least 85%, at least 90%, or at least 95%, identical to SEQ ID NO:1, SEQ ID NO:2, SEQ ID NO:3, SEQ ID NO:4, SEQ ID NO:5, SEQ ID NO:6, SEQ ID NO:7, SEQ ID NO:8, SEQ ID NO:9, SEQ ID NO:10, or SEQ ID NO:11.

In constructing the polypeptides provided herein, in certain embodiments, human sequences may be combined with non-human ces. For example, a polypeptide comprising human extracellular and intracellular domain amino acid sequences may se a transmembrane domain from a non-human species; e.g., may comprise a murine CTLA4 transmembrane domain or a murine PD-l transmembrane . In a more c embodiment, the polypeptide comprises human amino acid sequences for the extracellular and intracellular domains, and comprises a transmembrane domain having, or consisting of, the amino acid sequence of SEQ ID NO:5.

The extracellular domains of the polypeptides provided herein bind to an antigen of interest. In certain embodiments, the extracellular domain of a polypeptide provided herein comprises a receptor, or a portion of a receptor, that binds to said antigen. The extracellular domain may be, e.g., a receptor, or a portion of a receptor, that binds to said antigen. In certain embodiments, the extracellular domain comprises, or is, an antibody or an antigen-binding portion thereof. In specific ments, the ellular domain comprises, or is, a single- chain Fv domain. The single-chain Fv domain can comprise, for example, a VL linked to VH by a flexible linker, wherein said VL and VH are from an antibody that binds said antigen.

The n to which the extracellular domain of the polypeptides provided herein binds/recognizes can be any antigen of interest, e.g., can be an antigen on a tumor cell. The tumor cell may be, e.g., a cell in a solid tumor, or cell of a non-solid tumor, e.g., a cell of a blood . The antigen can be any antigen that is expressed on a cell of any tumor or cancer type, e.g., cells of a lymphoma, a lung cancer, a breast cancer, a prostate cancer, an adrenocortical carcinoma, a d carcinoma, a nasopharyngeal carcinoma, a melanoma, e.g., a malignant melanoma, a skin oma, a colorectal carcinoma, a desmoid tumor, a desmoplastic small round cell tumor, an endocrine tumor, an Ewing sarcoma, a peripheral primitive neuroectodermal tumor, a solid germ cell tumor, a hepatoblastoma, a neuroblastoma, a non-rhabdomyosarcoma soft tissue sarcoma, an osteosarcoma, a retinoblastoma, a rhabdomyosarcoma, a Wilms tumor, a glioblastoma, a myxoma, a fibroma, a lipoma, or the like. In more specific embodiments, said lymphoma can be chronic lymphocytic ia (small lymphocytic lymphoma), B-cell prolymphocytic leukemia, lymphoplasmacytic lymphoma, Waldenstrom macroglobulinemia, splenic marginal zone lymphoma, plasma cell myeloma, plasmacytoma, extranodal marginal zone B cell lymphoma, MALT lymphoma, nodal marginal zone B cell lymphoma, follicular lymphoma, mantle cell lymphoma, diffuse large B cell lymphoma, mediastinal (thymic) large B cell lymphoma, ascular large B cell lymphoma, primary effusion lymphoma, Burkitt’s lymphoma, T lymphocyte prolymphocytic leukemia, T lymphocyte large granular lymphocytic leukemia, aggressive NK cell leukemia, adult T lymphocyte leukemia/lymphoma, extranodal NK/T lymphocyte ma, nasal type, enteropathy-type T lymphocyte lymphoma, splenic T lymphocyte lymphoma, blastic NK cell lymphoma, mycosis fungoides, Sezary syndrome, primary cutaneous anaplastic large cell lymphoma, lymphomatoid papulosis, mmunoblastic T lymphocyte lymphoma, peripheral T lymphocyte lymphoma (unspecified), anaplastic large cell lymphoma, Hodgkin lymphoma, or a non-Hodgkin lymphoma. Antigens specific to n cancers, as well as methods for fying such antigens, are known in the art.

In a specific embodiment, in which the cancer is chronic lymphocytic leukemia (CLL), the B cells of the CLL have a normal karyotype. In other specific embodiments, in which the cancer is chronic lymphocytic ia (CLL), the B cells of the CLL carry a l7p deletion, an llq deletion, a 12q y, a l3q deletion or a p53 deletion.

In certain embodiments, the antigen recognized by the extracellular domain of a polypeptide described herein is a associated antigen (TAA) or a tumor-specific n (TSA). In various specific ments, the tumor-associated antigen or tumor-specific antigen is, without tion, Her2, prostate stem cell antigen (PSCA), alpha-fetoprotein (AFP), carcinoembryonic antigen (CEA), cancer antigen-125 (CA-125), CAl9-9, calretinin, MUC-l, epithelial membrane protein (EMA), epithelial tumor antigen (ETA), nase, melanoma- associated antigen (MAGE), CD19, CD22, CD27, CD30, CD34, CD45, CD70, CD99, CD117, EGFRVIII (epidermal growth factor variant III), mesothelin, PAP (prostatic acid atase), prostein, TARP (T cell receptor gamma alternate reading frame protein), Trp-p8, STEAPl (six- transmembrane epithelial antigen of the prostate 1), chromogranin, cytokeratin, desmin, glial fibrillary acidic n (GFAP), gross cystic disease fluid protein (GCDFP-15), HMB-45 antigen, protein melan-A (melanoma antigen recognized by T cytes; MART-1), myo-D1, muscle-specific actin (MSA), ilament, neuron-specific enolase (NSE), placental alkaline atase, synaptophysis, thyroglobulin, thyroid transcription factor-1, the dimeric form of the pyruvate kinase isoenzyme type M2 (tumor M2-PK), an abnormal ras protein, or an abnormal p53 protein.

In certain embodiments, the TAA or TSA recognized by the extracellular domain of a ptide described herein is integrin owB3 (CD61), galactin, or Ral-B.

In certain embodiments, the TAA or TSA recognized by the extracellular domain of a polypeptide described herein is a cancer/testis (CT) antigen, e.g., BAGE, CAGE, CTAGE, FATE, GAGE, HCA661, S-85, MAGEA, MAGEB, NA88,NY-ESO-1,NY-SAR- , OY-TES-l, SPANXBl, SPA17, SSX, SYCPl, or TPTE.

In certain other embodiments, the TAA or TSA recognized by the extracellular domain of a ptide described herein is a carbohydrate or ganglioside, e.g., filC-GMl, GM2 (oncofetal antigen-immunogenic-l; OFA-I-l); GD2 (OFA-I-2), GM3, GD3, and the like.

In certain other embodiments, the TAA or TSA recognized by the extracellular domain of a polypeptide described herein is alpha-actinin-4, Bage-l, BCR—ABL, Bcr-Abl fiasion protein, beta-catenin, CA 125, CA 15-3 (CA 27.29\BCAA), CA 195, CA 242, CA-50, CAM43, , cdc27, cdk4, cdkn2a, CEA, coa-1, dek-can fiasion protein, EBNA, EF2, n Barr Virus antigens, ETV6-AML1 fusion protein, HLA-A2, HLA-A11, 2, KIAAO205, Mart2, Mum- 1, 2, and 3, neo-PAP, myosin class I, OS-9, pml-RARu fusion protein, PTPRK, K-ras, N—ras, triosephosphate isomerase, Gage 3,4,5,6,7, GnTV, -mel, Lage-l, NA-88, NY-Eso- 1/Lage-2, SP17, SSX-2, TRP2-Int2, , gp100 (Pmel 17), tyrosinase, TRP-1, TRP-2, MAGE-l, MAGE-3, RAGE, , GAGE-2, p15(58), RAGE, H- , SCP-l, Hom/Mel-40, PRAME, p53, Ras, HER-2/neu, E2A-PRL, H4-RET, IGH-IGK, MYL-RAR, human papillomaVirus (HPV) antigens E6 and E7, TSP-180, MAGE-4, MAGE-5, MAGE-6, p185erbB2, p180erbB-3, c-met, 1, PSA, TAG4, CA 19-9, CA 72-4, CAM 17.1, NuMa, K-ras, 13-Catenin, Mum-1, p16, TAGE, PSMA, CT7, telomerase, 43-9F, 5T4, 79ngp72, l3HCG, BCA225, BTAA, , CD68\KPl, CO-029, FGF-S, G250, Ga733 (EpCAM), HTgp-l75, M344, MA-SO, MG7-Ag, MOV18, NB\70K, NY-CO-l, RCAS l, SDCCAGl6, TA-90, TAAL6, TAG72, TLP, or TPS.

Other associated and tumor-specific antigens are known to those in the art.

Antibodies, and scFvs, that bind to TSAs and TAAs are known in the art, as are nucleotide sequences that encode them.

In certain specific ments, the antigen recognized by the extracellular domain of a polypeptide described herein is an antigen not considered to be a TSA or a TAA, but which is nevertheless associated with tumor cells, or damage caused by a tumor. In certain embodiments, for example, the antigen is, e. g., a growth factor, cytokine or interleukin, e. g., a growth factor, cytokine, or interleukin associated with angiogenesis or vasculogenesis. Such growth factors, cytokines, or interleukins can include, e.g., vascular endothelial growth factor (VEGF), basic fibroblast growth factor (bFGF), platelet-derived growth factor (PDGF), cyte growth factor (HGF), insulin-like growth factor (IGF), or interleukin-8 . Tumors can also create a hypoxic environment local to the tumor. As such, in other specific embodiments, the n is a hypoxia-associated factor, e.g., HIF-lu, HIF-lB, HIF-20L, , HIP-30L, or HIF-3B. Tumors can also cause localized damage to normal tissue, causing the release of molecules known as damage associated lar pattern molecules (DAMPs; also known as alarmins). In certain other ic embodiments, therefore, the antigen is a DAMP, e.g., a heat shock protein, chromatin-associated protein high ty group box 1 (HMGB l), SlOOA8 (MRP8, nulin A), SlOOA9 (MRPl4, calgranulin B), serum amyloid A (SAA), or can be a deoxyribonucleic acid, adenosine triphosphate, uric acid, or heparin sulfate.

In certain ments, the extracellular domain of the polypeptides described herein is joined to the transmembrane domain of the polypeptide by a linker, spacer or hinge polypeptide sequence, e.g., a ce from CD28 or a sequence from CTLA4.

In n embodiments, the intracellular domain of a polypeptide described herein is or comprises an intracellular domain or motif of a protein that is expressed on the surface of T cells and triggers activation and/or proliferation of said T cells. Such a domain or motif is able to transmit a primary antigen-binding signal that is necessary for the activation of a T lymphocyte in response to the antigen’s binding to the CAR’s extracellular portion. lly, this domain or motif comprises, or is, an ITAM (immunoreceptor tyrosine-based activation motif). ITAM- containing polypeptides suitable for CARS e, for example, the zeta CD3 chain (CD35;) or ITAM-containing portions thereof. In a specific embodiment, the intracellular domain is a CD35; intracellular signaling domain. In other specific embodiments, the intracellular domain is from a lymphocyte receptor chain, a TCIVCD3 complex protein, an Fc receptor subunit or an IL-2 receptor subunit.

In certain embodiments, the polypeptides provided herein additionally comprise one or more co-stimulatory domains or motifs, e.g., as part of the intracellular domain of the ptide. The one or more co-stimulatory domains or motifs can be, or comprise, one or more of a co-stimulatory CD27 polypeptide sequence, a co-stimulatory CD28 ptide sequence, a co-stimulatory 0X40 ) polypeptide sequence, a co-stimulatory 4-1BB (CD137) polypeptide sequence, or a co-stimulatory inducible T-cell costimulatory (ICOS) polypeptide sequence, or other costimulatory domain or motif.

In a specific embodiment, a polypeptide provided herein comprises, in order, from N- terminus to inus: (i) an antigen-binding domain (e.g., an n binding domain that binds an antigen on a tumor cell, e.g., an antigen on a tumor cell described above); (ii) a CD28 or CTLA4 hinge polypeptide sequence; (iii) a CTLA4 or PD-l transmembrane domain; (iv) a ulatory domain; and (v) an intracellular signaling .

In another specific ment, a polypeptide provided herein comprises, in order, from N—terminus to C-terminus: (i) an antigen-binding domain (e.g., an antigen binding domain that binds an antigen on a tumor cell, e. g., an antigen on a tumor cell described above); (ii) a CH2CH3 hinge ptide sequence; (iii) a CTLA4 or PD-l transmembrane domain; (iv) a CD28 ulatory domain; and (v) a CD35; ellular signaling domain.

In another specific embodiment, a polypeptide provided herein comprises, in order, from N—terminus to C-terminus: (i) an antigen-binding domain (e.g., an antigen binding domain that binds an antigen on a tumor cell, e.g., an antigen on a tumor cell described ; (ii) a CD28 hinge polypeptide sequence; (iii) a CTLA4 or PD-l transmembrane domain; (iv) a 4-lBB costimulatory ; and (v) a CD35; intracellular signaling domain.

In another specific embodiment, a polypeptide provided herein comprises, in order, from N—terminus to C-terminus: (i) an antigen-binding domain (e.g., an antigen binding domain that binds an antigen on a tumor cell, e.g., an antigen on a tumor cell described above); (ii) a PD-l hinge polypeptide sequence; (iii) a CTLA4 or PD-l transmembrane domain; (iv) a costimulatory domain; and (V) an intracellular ing domain.

In another specific embodiment, a polypeptide provided herein comprises, in order, from N—terminus to C-terminus: (i) a single-chain Fv domain comprising a VL linked to VH by a , wherein said VL and VH are from an antibody that binds an antigen of interest (e.g., an antigen on a tumor cell, e.g., an antigen on a tumor cell described above); (ii) a CD28 hinge polypeptide sequence; (iii) a CTLA4 transmembrane domain; (iv) a CD28 costimulatory domain; and (v) a CD35; intracellular ing domain.

In r specific embodiment, a polypeptide provided herein comprises, in order, from N—terminus to C-terminus: (i) a single-chain Fv domain comprising a VL linked to VH by a linker, wherein said VL and VH are from an antibody that binds an antigen of interest (e.g., an antigen on a tumor cell, e.g., an antigen on a tumor cell described above); (ii) a CTLA4 hinge polypeptide sequence; (iii) a CTLA4 transmembrane domain; (iv) a CD28 costimulatory domain; and (v) a CD35; intracellular signaling domain.

In r specific embodiment, a polypeptide provided herein ses, in order, from N—terminus to inus: (i) a single-chain Fv domain comprising a VL linked to VH by a linker, wherein said VL and VH are from an antibody that binds an antigen of interest (e.g., an antigen on a tumor cell, e.g., an antigen on a tumor cell described above); (ii) a CD28 hinge polypeptide sequence; (iii) a PD-l embrane domain; (iv) a CD28 costimulatory domain; and (v) a CD35; intracellular signaling domain.

In another specific ment, a ptide provided herein comprises, in order, from N—terminus to C-terminus: (i) a single-chain Fv domain sing a VL linked to VH by a linker, wherein said VL and VH are from an antibody that binds an antigen of interest (e.g., an antigen on a tumor cell, e.g., an antigen on a tumor cell described above); (ii) a CTLA4 hinge polypeptide sequence; (iii) a PD-l transmembrane domain; (iv) a CD28 costimulatory domain; and (v) a CD35; intracellular signaling domain.

In another specific embodiment, a polypeptide ed herein comprises, in order, from N—terminus to C-terminus: (i) a single-chain Fv domain comprising a VL linked to VH by a linker, wherein said VL and VH are from an dy that binds an antigen of interest (e.g., an antigen on a tumor cell, e.g., an antigen on a tumor cell described above); (ii) a CTLA4 hinge polypeptide sequence; (iii) a PD-l transmembrane domain; (iv) a CD28 costimulatory domain; and (V) a CD35; intracellular signaling domain.

In another specific ment, a polypeptide ed herein comprises, in order, from N—terminus to C-terminus: (i) an antigen-binding domain (e.g., an antigen binding domain that binds an antigen on a tumor cell, e.g., an n on a tumor cell described above); (ii) a PD-l hinge polypeptide sequence; (iii) a CTLA4 or PD-l transmembrane domain; (iv) a costimulatory domain; and (v) an intracellular signaling domain.

In another specific embodiment, a polypeptide provided herein comprises, in order, from N—terminus to C-terminus: (i) a -chain Fv domain comprising a VL linked to VH by a linker, wherein said VL and VH are from an antibody that binds an antigen of interest (e.g., an antigen on a tumor cell, e.g., an antigen on a tumor cell described above); (ii) a PD-l hinge polypeptide sequence; (iii) a CTLA4 transmembrane domain; (iv) a CD28 costimulatory domain; and (v) a CD35; intracellular signaling .

In another specific embodiment, a ptide provided herein comprises, in order, from N—terminus to C-terminus: (i) a single-chain Fv domain comprising a VL linked to VH by a linker, wherein said VL and VH are from an antibody that binds an antigen of st (e.g., an antigen on a tumor cell, e.g., an antigen on a tumor cell described above); (ii) a PD-l hinge polypeptide sequence; (iii) a PD-l embrane domain; (iv) a CD28 costimulatory domain; and (v) a CD35; ellular signaling domain.

In another specific embodiment, a polypeptide provided herein comprises, in order, from N—terminus to C-terminus: (i) a single-chain Fv domain comprising a VL linked to VH by a linker, wherein said VL and VH are from an antibody that binds an n of interest (e.g., an antigen on a tumor cell, e.g., an antigen on a tumor cell described above); (ii) a CTLA4 hinge polypeptide sequence; (iii) a CTLA4 transmembrane domain; (iv) a 4-lBB costimulatory domain; and (v) a CD35; intracellular signaling domain.

In another specific embodiment, the polypeptide comprises, in order, from N—terminus to C-terminus: (i) a single-chain Fv domain comprising a VL linked to VH by a linker, wherein said VL and VH are from an antibody that binds an antigen of st (e.g., an antigen on a tumor cell, e. g., an antigen on a tumor cell described above); (ii) a CD28 hinge polypeptide sequence; (iii) a PD-l transmembrane ; (iv) a 4-lBB costimulatory domain; and (v) a CD35; intracellular signaling domain.

In another c embodiment, the polypeptide ses, in order, from N—terminus to C-terminus: (i) a single-chain Fv domain comprising a VL linked to VH by a linker, wherein said VL and VH are from an dy that binds an antigen of interest (e.g., an antigen on a tumor cell, e. g., an antigen on a tumor cell described above); (ii) a CTLA4 hinge polypeptide sequence; (iii) a PD-l transmembrane domain; (iv) a 4-lBB costimulatory domain; and (V) a CD35; intracellular signaling domain.

In another specific embodiment, the ptide comprises, in order, from N—terminus to inus: (i) a single-chain Fv domain comprising a VL linked to VH by a linker, wherein said VL and VH are from an antibody that binds an antigen of interest (e.g., an antigen on a tumor cell, e. g., an antigen on a tumor cell described above); (ii) a PD-l hinge polypeptide sequence; (iii) a CTLA4 transmembrane domain; (iv) a 4-lBB costimulatory domain; and (V) a CD35; intracellular signaling domain. .1. Isolated Polypeptides [Chimeric Antigen Receptors] The T lymphocyte-stimulatory ptides provided herein, which comprise a CTLA4 or PD-l transmembrane domain, may be d by, e. g., acylation, amidation, glycosylation, methylation, phosphorylation, sulfation, sumoylation, ubiquitylation, or the like. The polypeptides may be labeled with a label capable of providing a detectable signal, e. g., with sotopes and fluorescent compounds. One or more side chains of the first or second ptides may be derivatized, e.g., derivatization of lysinyl and amino terminal residues with succinic or other carboxylic acid anhydrides, or derivatization with, e.g., imidoesters such as methyl picolinimidate; pyridoxal phosphate; pyridoxal; chloroborohydride; trinitrobenzenesulfonic acid; O-methylisourea; 2,4 pentanedione; and transaminase-catalyzed on with glyoxylate. Carboxyl side groups, aspartyl or glutamyl, may be selectively modified by reaction with carbodiimides (R—N=C=N—R') such as l-cyclohexyl(2- morpholinyl-(4-ethyl)carbodiimide or l-ethyl(4-azonia-4,4-dimethylpentyl)carbodiimide. .2. Isolated Nucleic Acids Provided herein are nucleic acid ces (polynucleotides) that encode one or more of the polypeptides provided herein. The polynucleotides may be ned within any polynucleotide vector suitable for the transformation of immune cells, e.g., T lymphocytes. For example, T lymphocytes may be transformed using synthetic vectors, lentiviral or retroviral vectors, autonomously ating plasmids, a virus (e.g., a retrovirus, lentivirus, adenovirus, or herpes virus), or the like, containing polynucleotides encoding the first and second polypeptides (e. g., chimeric receptors). Lentiviral vectors suitable for transformation of T lymphocytes include, but are not limited to, e. g., the iral s described in US. Patent Nos. 5,994,136; 6,165,782; 6,428,953; 7,083,981; and 7,250,299, the sures of which are hereby incorporated by reference in their entireties. HIV vectors suitable for transformation of T lymphocytes include, but are not limited to, e.g., the vectors described in US. Patent No. ,665,577, the disclosure of which is hereby incorporated by reference in its entirety.

Nucleic acids useful in the tion of the first and second ptides, e.g., within a modified T lymphocyte, include DNA, RNA, or nucleic acid analogs. Nucleic acid analogs can be modified at the base , sugar moiety, or phosphate backbone, and can include deoxyuridine tution for deoxythymidine, 5-methyl-2'-deoxycytidine or 5-bromo-2'- deoxycytidine substitution for deoxycytidine. Modifications of the sugar moiety can include modification of the 2' hydroxyl of the ribose sugar to form 2'-O-methyl or 2'-O-allyl sugars. The deoxyribose phosphate backbone can be d to produce morpholino nucleic acids, in which each base moiety is linked to a six membered, lino ring, or peptide nucleic acids, in which the deoxyphosphate backbone is ed by a pseudopeptide backbone and the four bases are retained. See, for example, Summerton and Weller (1997) Antisense Nucleic Acid Drug Dev. 7:187-195; and Hyrup et al. (1996) Bioorgan. Med. Chain. 4:5-23. In addition, the deoxyphosphate backbone can be ed with, for example, a orothioate or phosphorodithioate ne, a phosphoroamidite, or an alkyl phosphotriester backbone. .3. T Lymphocytes Provided herein are immune cells, e. g., T lymphocytes, comprising the ptides provided herein. The T lymphocytes provided herein may be naive T lymphocytes or MHC- restricted T lymphocytes. In certain embodiments, the T lymphocytes provided herein are tumor infiltrating lymphocytes (TILs). In certain embodiments, the T lymphocytes provided herein have been isolated from a tumor biopsy, or have been expanded from T lymphocytes isolated from a tumor biopsy. In certain other embodiments, the T lymphocytes provided herein have been isolated from, or expanded fiom, T lymphocytes expanded from, peripheral blood, cord blood, or lymph.

In certain embodiments, the immune cells provided herein that comprise a ptide provided herein, e.g., modified T lymphocytes, are autologous to an individual to whom the modified T lymphocytes are to be administered. In certain embodiments, the d T lymphocytes provided herein are allogeneic to an individual to Whom the modified T lymphocytes are to be administered. Where neic T lymphocytes are used to prepare modified T lymphocytes, T lymphocytes can be selected that will reduce the possibility of graft- -host disease (GVHD) in the individual. For example, in n embodiments, virus- c T lymphocytes can be selected for preparation of modified T lymphocytes; such lymphocytes will be ed to have a greatly reduced native capacity to bind to, and thus become ted by, any recipient antigens. In certain ments, recipient-mediated rejection of allogeneic T lymphocytes can be reduced by co-administration to the host of one or more immunosuppressive agents, e.g., cyclosporine, tacrolimus, sirolimus, cyclophosphamide, or the like.

In one embodiment, T lymphocytes are obtained from an individual, optionally expanded, and then transformed with a polynucleotide encoding a CTLA4 or PD-l transmembrane domain- containing polypeptide described herein, and optionally expanded. In another embodiment, T lymphocytes are obtained from an individual, optionally then expanded, and then transformed with a cleotide encoding a CTLA4 or PD-l transmembrane -containing polypeptide described herein, and optionally then ed at least one more time. Cells ning the polynucleotides may be selected using a selectable marker.

In certain embodiments, the modified T lymphocytes described herein express or comprise native TCR proteins, e.g., TCR-0t and TCR-B that are capable of forming native TCR complexes, in addition to the CTLA4 or PD-l transmembrane domain-containing polypeptide.

In certain other embodiments, either or both of the native genes encoding TCR-0t and TCR-B in the modified T lymphocytes are modified to be non-functional, e.g., a portion or all are d, a mutation is inserted, etc.

In certain embodiments, the T lymphocytes described herein are isolated from a tumor lesion, e.g., are tumor-infiltrating lymphocytes; such T lymphocytes are expected to be specific for a TSA or TAA.

In certain embodiments, the ing motifs of the CTLA4 or PD-l transmembrane domain-containing ptide, e.g., CAR, can be used to promote proliferation and expansion of the modified T lymphocytes described herein. For example, unmodified T lymphocytes, and T lymphocytes comprising a polypeptide comprising a CD35; signaling domain and a CD28 co- stimulatory domain can be expanded using antibodies to CD3 and CD28, e.g., antibodies attached to beads, or to the surface of a cell culture plate; see, e.g., US. Patent Nos. 5,948,893; 6,534,055; 694; 6,692,964; 6,887,466; and 6,905,681. In certain embodiments, the antigen, to which the extracellular domain of the CTLA4 or PD-l transmembrane domain-containing polypeptide binds, can be used to promote selective expansion of T lymphocytes expressing the polypeptide. For example, in one embodiment, in which the antigen is a TSA, T lymphocytes comprising the polypeptide cultured in the presence of the TSA, e.g., a e form of the TSA, resulting in increased eration as compared to culturing in the absence of the TSA.

In certain embodiments, T lymphocytes comprising a CTLA4 or PD-l transmembrane domain-containing polypeptide described herein are stimulated to proliferate using an antibody that binds to a signaling domain on the polypeptide d with the antigen that can be bound by the extracellular antigen-binding domain of the polypeptide. For example, in embodiments in which the polypeptide’s signaling domain is CD35; and the antigen that binds to the polypeptide is a TSA, T lymphocytes sing the polypeptide are stimulated to proliferate by ing the cells in the presence of the TSA (e. g., a soluble form of the TSA) in combination with an antibody that binds to CD35; In any of the above embodiments, the antigen and/or antibody can exist free in the medium in which the T lymphocytes are cultures, or either or both can be attached to a solid t, e.g., tissue culture plastic surface, beads, or the like.

The T lymphocytes comprising a CTLA4 or PD-l transmembrane domain-containing ptide bed herein can optionally comprise a "suicide gene" or "safety " that enables killing of all or substantially all of the T lymphocytes when desired. For example, the modified T lymphocytes bed herein, in certain ments, can comprise an HSV thymidine kinase gene (HSV-TK), which causes death of the d T lymphocytes upon t with gancyclovir. In another embodiment, the modified T lymphocytes express or comprise an inducible caspase, e. g., an inducible caspase 9 (icaspase9), e. g., a fusion protein between caspase 9 and human FK506 binding protein allowing for dimerization using a specific small molecule pharmaceutical. See Straathof et al., Blood 105(11):4247-4254 (2005). .4. Methods of Using Modified T Lymphocytes The modified immune cells, e. g., the modified T lymphocytes, provided herein that comprise a CTLA4 or PD-l transmembrane domain-containing polypeptide, e.g., CAR, can be used to treat an individual having one or more types of cells desired to be targeted by T cytes, e.g., one or more types of cells to be . In certain embodiments, the cells to be killed are cancer cells, e.g., tumor cells. In certain embodiments, the cancer cells are cells of a solid tumor. In certain embodiments, the cells are cells of a ma, a lung cancer, a breast cancer, a prostate cancer, an adrenocortical carcinoma, a thyroid carcinoma, a nasopharyngeal carcinoma, a melanoma, e. g., a malignant melanoma, a skin carcinoma, a colorectal carcinoma, a d tumor, a desmoplastic small round cell tumor, an endocrine tumor, an Ewing a, a peripheral primitive neuroectodermal tumor, a solid germ cell tumor, a hepatoblastoma, a lastoma, a non-rhabdomyosarcoma soft tissue sarcoma, an osteosarcoma, a retinoblastoma, a rhabdomyosarcoma, a Wilms tumor, a glioblastoma, a myxoma, a fibroma, a , or the like. In more specific embodiments, said lymphoma can be chronic lymphocytic leukemia (small lymphocytic lymphoma), B-cell prolymphocytic leukemia, lymphoplasmacytic lymphoma, Waldenstrom macroglobulinemia, splenic marginal zone lymphoma, plasma cell myeloma, plasmacytoma, odal marginal zone B cell lymphoma, MALT lymphoma, nodal marginal zone B cell lymphoma, follicular ma, mantle cell lymphoma, diffuse large B cell lymphoma, mediastinal (thymic) large B cell lymphoma, intravascular large B cell lymphoma, primary effilsion lymphoma, Burkitt’s ma, T lymphocyte prolymphocytic leukemia, T cyte large granular lymphocytic leukemia, aggressive NK cell leukemia, adult T lymphocyte leukemia/lymphoma, extranodal NK/T lymphocyte lymphoma, nasal type, enteropathy-type T lymphocyte lymphoma, hepatosplenic T lymphocyte lymphoma, blastic NK cell lymphoma, mycosis filngoides, Sezary me, primary ous stic large cell lymphoma, lymphomatoid papulosis, angioimmunoblastic T lymphocyte lymphoma, peripheral T lymphocyte lymphoma (unspecified), anaplastic large cell lymphoma, Hodgkin lymphoma, or a non-Hodgkin lymphoma.

Efficacy of the modified T cytes described herein, after administration to an individual having a disease or disorder remediable by T lymphocytes, e.g., an individual having cancer, can be assessed by one or more criteria, specific to the particular disease or disorder, known to those of ordinary skill in the art, to be indicative of progress of the disease or disorder.

Generally, administration of the modified T lymphocytes described herein to such an individual is ive when one or more of said criteria detectably, e.g., significantly, moves from a disease state value or range to, or towards, a normal value or range.

The modified T lymphocytes described herein may be ated in any pharmaceutically-acceptable solution, preferably a solution suitable for the delivery of living cells, e.g., saline solution (such as 's on), gelatins, carbohydrates (e.g., lactose, amylose, starch, or the like), fatty acid , hydroxymethylcellulose, polyvinyl pyrolidine, etc.

Such preparations are preferably sterilized prior to addition of the modified T lymphocytes, and may be mixed with auxiliary agents such as lubricants, preservatives, stabilizers, emulsifiers, salts for influencing osmotic pressure, buffers, and coloring. Pharmaceutical carriers suitable for use in ating the modified T lymphocytes are known in the art and are described, for example, in WO 96/05309.

In certain embodiments, the modified T lymphocytes described herein are formulated into individual doses, wherein said individual doses comprise at least, at most, or about 1x104, 5x104, 1x105,5x105,1x106,5x106,1x107,5x107,1x108,5x108,1x109,5x109,1x101°,5><101°,or IX 1011 modified T lymphocytes. In certain embodiments, the modified T lymphocytes are formulated for intravenous, intraarterial, parenteral, intramuscular, subcutaneous, intrathecal, or intraocular administration, or stration within a particular organ or . 6. EXAMPLES 6.1. Example 1: Treatment of B Cell Lymphoma An individual presents with B-cell chronic lymphocytic leukemia, a B cell lymphoma.

Testing of B cells from the individual determines that the B cells carry a 17p deletion. T lymphocytes are obtained from the individual, transfected with a lentiviral vector comprising a nucleotide sequence that encodes a chimeric antigen receptor (CAR), and expanded using CD3+CD28-coated beads to sufficient numbers for administration. The chimeric or comprises an ellular antigen-binding region that binds to CD19; a transmembrane domain from CTLA4; an intracellular co-stimulatory domain from CD28; and an ellular CD35; domain. The individual is administered between 109 and 1010 of the T cytes in a 200 ml saline solution by intravenous infusion over 30 minutes. The dual is monitored for two weeks afterwards to establish a reduction of at least 90% of CD19+ B cells in the dual’s blood. 6.2. Example 2: Treatment of a B Cell Lymphoma An individual presents with B-cell chronic lymphocytic leukemia, a B cell lymphoma.

Testing of B cells from the individual ines that the B cells carry a 17p deletion. About 106 T lymphocytes are obtained from the individual, transfected with a lentiviral vector comprising a nucleotide sequence that encodes a CAR. The CAR comprises an extracellular antigen-binding region that binds to CD19; a transmembrane domain from PD-l; an intracellular co-stimulatory domain from CD28; and an intracellular CD35; domain. pressing T cells are administered to the individual without prior expansion of the T cells. The individual is stered between 105 and 106 of the T lymphocytes in 200 ml saline on by intravenous infusion over 30 minutes. The individual is monitored for two weeks afterwards to establish a reduction of at least 90% of CD19+ B cells in the individual’s blood. 6.3. Example 3: Treatment of B Cell Lymphoma An individual presents with B-cell chronic cytic leukemia, a B cell lymphoma.

Testing of B cells from the individual determines that the B cells carry a p53 on. T lymphocytes are obtained from the dual, transfected with a lentiviral vector comprising a tide sequence that encodes a CAR, and expanded using CD3+CD28-coated beads to sufficient numbers for administration. The CAR comprises an extracellular antigen-binding region that binds to CD19; a transmembrane domain from CTLA4; ellular co-stimulatory domains from each of CD28, 4-lBB, and 0X40; and an intracellular CD35; domain. The individual is administered between 109 and 1010 of the T lymphocytes in 200 ml saline solution by intravenous infusion over 30 minutes. The individual is monitored for two weeks afterwards to ish a reduction of at least 90% of CD19+ B cells in the individual’s blood. 6.4. Example 4: Treatment of a B Cell Lymphoma An dual presents with B-cell chronic lymphocytic leukemia, a B cell lymphoma. Testing of B cells from the individual determines that the B cells carry a p53 deletion. About 106 T lymphocytes are obtained from the individual, transfected with a iral vector comprising a nucleotide sequence that encodes a CAR. The CAR comprises an extracellular antigen-binding region that binds to CD19; a transmembrane domain from PD-l; intracellular co-stimulatory domains from each of CD28, 4-lBB, and 0X40; and an intracellular CD35; domain. CAR- expressing T cells are administered to the individual without prior expansion of the T cells. The individual is administered between 105 and 106 of the T lymphocytes in 200 ml saline solution by enous infiJsion over 30 minutes. The individual is monitored for two weeks afterwards to establish a reduction of at least 90% of CD19+ B cells in the individual’s blood. 6.5. Example 5: ent of Prostate Cancer An individual presents with stage T2 prostate cancer, with no spread to regional or other lymph nodes (N0, M0). Histological grade is determined to be G2. Overall, the individual is determined to have Stage 11 prostate cancer. The individual is administered between 109 and 1010 modified T lymphocytes that se a CAR, in 200 ml saline solution by enous infusion over 30 minutes. The CAR comprises an extracellular antigen-binding region that binds to PSCA, a embrane domain from CTLA4, an intracellular co-stimulatory domain from CD28, and an intracellular CD35; domain. The individual is re-assessed for prostate cancer stage and spread to lymph nodes, and histology of ed prostate tissue is performed, at 30, 60 and 90 days post-administration. 6.6. Example 6: Treatment of Prostate Cancer An individual presents with stage T2 prostate , with no spread to regional or other lymph nodes (N0, M0). Histological grade is determined to be G2. Overall, the individual is determined to have Stage 11 prostate cancer. The individual is administered between 109 and 1010 modified T lymphocytes that comprise a CAR, in 200 ml saline on by intravenous on over 30 minutes. The CAR comprises an extracellular antigen-binding region that binds to PSCA, a transmembrane domain from PD-l an intracellular co-stimulatory domain from CD28, and an intracellular CD35; domain. The individual is essed for prostate cancer stage and spread to lymph nodes, and histology of biopsied prostate tissue is performed, at 30, 60 and 90 days post-administration. 6.7. Example 7: Treatment of Prostate Cancer An individual presents with stage T2 prostate cancer, with no spread to regional or other lymph nodes (N0, M0). Histological grade is determined to be G2. Overall, the individual is determined to have Stage 11 te cancer. The individual is administered between 109 and 1010 modified T lymphocytes that comprise a CAR, in 200 ml saline on by intravenous infusion over 30 minutes. The CAR comprises an extracellular antigen-binding region that binds to PSCA, a transmembrane domain from CTLA-4, intracellular co-stimulatory domains from each of CD28, 4-lBB, and 0X40, and an ellular CD35; domain. The individual is re- assessed for prostate cancer stage and spread to lymph nodes, and histology of biopsied prostate tissue is med, at 30, 60 and 90 days post-administration. 6.8. Example 8: Treatment of Prostate Cancer An individual presents with stage T2 prostate cancer, with no spread to regional or other lymph nodes (N0, M0). Histological grade is determined to be G2. l, the individual is determined to have Stage 11 te cancer. The individual is administered between 109 and 1010 modified T lymphocytes that se a CAR, in 200 ml saline solution by intravenous infusion over 30 minutes. The CAR ses an extracellular antigen-binding region that binds to PSCA, a transmembrane domain from PD-l intracellular co-stimulatory domains from each of CD28, 4-1BB, and 0X40, and an intracellular CD35; domain. The individual is essed for prostate cancer stage and spread to lymph nodes, and histology of biopsied prostate tissue is performed, at 30, 60 and 90 days post-administration. 6.9. Example 9: CARS Comprising a CTLA-4 or PD-l Transmembrane Domain This example demonstrates that a chimeric antigen receptor comprising a CTLA-4 or PD- 1 transmembrane domain is functional and active in T cells. 6.9.1 CARS Comprising a CTLA-4 Transmembrane Domain CARs comprising an extracellular domain (anti-HER2 scFV) that binds the antigen HER2 were generated. cally, the following CARs were generated: (i) HER-28TMC, comprising an Anti-HER2 scFV, a CD28 transmembrane domain, and a CD35; intracellular domain; (ii) HER-28TM28C, comprising an Anti-HER2 scFV, a CD28 embrane domain, and a CD28-CD3C intracellular domain; (iii) HER2-CTLA4TM28C, sing an Anti-HER2 scFV, a CH2CH3 hinge, a CTLA-4 transmembrane domain (SEQ ID NO: 10), and a CD28-CD3C intracellular domain; and (iv) HER2-41BBTM28C, sing an Anti-HER2 scFV, a CD8 hinge, a 4-lBB transmembrane domain, and a D3C intracellular domain.

The ability of human T cells to express the CARs described above was assessed. Pan T cells and naive Pan T cells were isolated from buffy coat of donor sample blood by negative selection using a human Pan T isolation Kit 11 and human na'ive Pan T isolation kit, respectively (Miltenyi, Cambridge, MA). Isolated T cells were cultured in RPMI complete media in the presence of 10 ng/ml IL-7 for 11 days, and then transduced with lentivirus expressing CAR constructs at MOI of 5.

Three days after transduction, CAR T cell phenotype was characterized staining the cells with a HER2-Fc fusion protein (R&D Systems, Minneapolis, MN), ed by staining with a polyclonal goat anti-human IgG-Fc antibody conjugated with FITC or APC) on ImmunoRessearch, West Grove, PA). On the same day, T cells were stimulated with HER2-Fc fusion protein at a gradient of concentrations g from 0.25 ug/ml to l ug/ml. Supernatant was collected 48 hours timulation for cytometric beads array (CBA) analysis, to assess cytokine production by the T cells, using a customized CBA flex set (BD Biosciences, San Jose, CA). The cells from the culture after supernatant removal were stained for measurement of T cell activation surface markers CD69, 4-lBB, CD71, HLA-DR, and CD25 using anti-human onal antibodies with fluorochrome conjugates (BD Biosciences). Flow cytometric analysis for both CBA and surface markers was med on a FACS Canto 11 machine and data were acquired with FACSDiva software (BD Biosciences). The CBA data were analyzed with FCAP Assay software (Soft Flow Ltd., Pecs, Hungary). e marker flow data were analyzed using FlowJo flow cytometry software (Tree Star, Ashland, OR).

As shown in Figure 1, three of the CARs generated, including the CAR having a CTLA-4 transmembrane domain, were highly expressed by the T cells. T cell activation surface markers CD69, 4-lBB, and HLA-DR each were upregulated upon CAR ligation, i.e., when the CAR T cells were stimulated with HER2-Fc fusion protein. In each case, the highest levels were observed in CAR T cells expressing the construct HER2-CTLA4TM28C.

As shown in Figures 2-4, two of the four sets of CAR T cells demonstrated cytokine production in response to HER2 stimulation. Specifically, T cells expressing the CAR designated HER2-28TM28C and T cells expressing the CAR designated HER2-CTLA4TM28C produced the cytokines interleukin-2 (IL-2) e 2), GM-CSF (Figure 3), and eron- gamma (IFN—y) (Figure 4) in a dose-dependent manner in response to HER2 stimulation. singly, T cells expressing a CAR comprising a embrane domain from a protein that normally transmits an inhibitory signal to immune system cells (i.e., CTLA-4 transmembrane domain) produced a much higher level of each cytokine as compared to T cells expressing each of the other CARs, including T cells expressing the CAR ated HER2-28TM28C. See Figures 2-4.

It further was examined whether stimulation of T cells expressing the CARs described above with HER2 induces intracellular tumor necrosis factor-alpha (TNF-(x) tion by the T cells. The CAR T cells were stimulated with HER2-Fc (l ug/ml) for 2 days in medium containing IL-2 (50 . The HER2 stimulation was performed two more times, separated by seven days each time. After the third stimulation, intracellular TNF-(x was examined by flow cytometry. As shown in Figure 5, T cells expressing the CAR designated HER2-28TM28C, T cells expressing the CAR designated HER2-CTLA4TM28C, and T cells expressing the CAR designated HER2-28TME; produced TNF-u, with the highest amount of TNF-u produced by T cells expressing a CAR comprising a transmembrane domain from a protein that ly its an inhibitory signal to immune system cells (i.e., CTLA-4 transmembrane domain).

Finally, it was determined whether ation of T cells expressing the CARs bed above with HER2 results in enrichment of the CAR T cell populations. CAR T cells expressing the CARs described above were stimulated with HER2-Fc fusion protein. Thirteen days post- stimulation with HER2, CAR T cells were analyzed by flow cytometry, as described above.

Surprisingly, as shown in Figure 6, only CAR T cells expressing the CAR designated HER2- CTLA4TM28<‘; were enriched following HER2 stimulation. 6.9.2 CARS Comprising a PD-1 or CTLA-4 Transmembrane Domain This example trates that a chimeric antigen receptor comprising a CTLA-4 transmembrane domain or a PD-l transmembrane domain is fianctional and active in T cells.

CARs sing an extracellular domain (anti-HER2 scFV) that binds the antigen HER2 were generated. cally, the following CARs were generated: (i) HER-PDlTM- CD28-CD3, comprising an Anti-HER2 scFV, a CH2CH3 hinge, a PD-l transmembrane domain (SEQ ID NO: 1 l), and a CD28-CD3 intracellular domain; (ii) HER-CTLA4(l89)TM-4lBB-CD3, comprising an Anti-HER2 scFV, a CD28 hinge, a CTLA-4 transmembrane domain (SEQ ID NO: 10), and a 4-lBB-CD3 intracellular domain; (iii) HER-PDlTM-4lBB-CD3, comprising an Anti-HER2 scFV, a CD28 hinge, a PD-l transmembrane domain (SEQ ID NO: 1 l), and a 4-lBB- CD3 intracellular domain; and (iv) HER2-CD28TM-CD28-CD3, comprising an Anti-HER2 scFV, a CD28 hinge, a CD28 transmembrane domain, and a CD28-CD3 intracellular domain.

Pan T cells and naive Pan T cells were isolated from buffy coat of donor sample blood by negative selection using a human Pan T isolation Kit II and human na'ive Pan T ion kit, respectively (Miltenyi, Cambridge, MA). Isolated T cells were cultured in RPMI te media in the presence of 10 ng/ml IL-7 for 11 days, and then transduced with lentivirus expressing CAR constructs at MOI of 7.

Three days after transduction, CAR T cell phenotype was terized staining the cells with a HER2-Fc fusion protein (R&D Systems, Minneapolis, MN), ed by staining with a onal goat anti-human IgG-Fc antibody conjugated with FITC or APC) (Jackson ImmunoRessearch, West Grove, PA). On the same day, T cells were stimulated with HER2-Fc fusion protein at a gradient of concentrations ranging from 0.25 ug/ml to l ug/ml. Supernatant was collected 48 hours post-stimulation for tric beads array (CBA) analysis, to assess cytokine production by the T cells, using a customized CBA flex set (BD Biosciences, San Jose, CA). The cells from the e after supernatant l were stained for measurement of T cell activation surface markers CD69, 4-lBB, CD71, HLA-DR, and CD25 using uman monoclonal antibodies with fluorochrome conjugates (BD Biosciences). Flow cytometric analysis for both CBA and surface markers was performed on a FACS Canto 11 machine and data were acquired with FACSDiva software (BD Biosciences). The CBA data were analyzed with FCAP Assay software (Soft Flow Ltd., Pecs, Hungary). Surface marker flow data were analyzed using FlowJo flow cytometry software (Tree Star, d, OR).

As shown in Figure 7, each of the CARs generated were highly expressed by the T cells.

T cell activation surface markers CD69, CD71, and HLA-DR each were upregulated upon stimulation of the above-described CAR T cells with HER2. In each case, the observed levels of upregulation were highest in CAR T cells expressing CARs with either a PD-l or a CTLA-4 embrane domain.

As shown in Figures 8-9, the CAR T cells demonstrated cytokine production in response to HER2 stimulation. Specifically, T cells expressing the CARs described above produced the cytokines IL-2 (Figure 8), TNF-(x (Figure 8), and IFN—y (Figure 8), GM-CSF (Figure 9), Granzyme B e 9), and IL-l3 (Figure 9) in a dose-dependent manner in response to HER2 stimulation. In each case, T cells expressing CARs comprising a PD-l or CTLA-4 transmembrane domain exhibited the highest levels of cytokine production, with T cells expressing the CAR designated HER-PDlTM-CD28-CD3 consistently ing the highest levels of each cytokine (see Figs. 8 and 9).

Finally, it was determined r stimulation of T cells expressing the CARs described above with HER2 s in enrichment of the CAR T cell populations. CAR T cells expressing the CARs bed above were stimulated with HER2-Fc fusion protein. Eleven days post- ation with HER2, CAR T cells were analyzed by flow cytometry, as described above. As shown in Figure 10, CAR T cells expressing the CAR designated HER-PDlTM-CD28-CD3 were enriched following HER2 stimulation, with T cells expressing the other CARs described showing modest levels of increase in live cells over the initial cell number. 6.9.3 Conclusion In conclusion, generation of T cells expressing a CAR that comprises a transmembrane domain from a protein that normally transmits an inhibitory signal to immune system cells has been demonstrated. Further, it has been shown that such CAR T cells possess surprising characteristics. In particular, such T cells (i) demonstrate elevated levels of cytokine production in response to stimulation with the antigen to which the extracellular domain of the CAR they express is directed, as compared to T cells expressing CARs that comprise a transmembrane domain from a protein that normally transmits a stimulatory signal to immune system cells; and (ii) are ed when cultured in the presence of the antigen to which the extracellular domain of the CAR they s is directed, s T cells expressing CARs that comprise a transmembrane domain from a protein that normally transmits a atory signal to immune system cells are not enriched to the same extent, when stimulated with the antigen.

EQUIVALENTS The present disclosure is not to be limited in scope by the specific embodiments described herein. Indeed, various modifications of the t matter provided herein, in addition to those described, will become apparent to those skilled in the art from the ing description.

Such ations are intended to fall within the scope of the appended claims.

Various publications, patents and patent applications are cited herein, the disclosures of which are orated by reference in their entireties.

Claims (82)

WHAT WE CLAIM IS:

1. Use of a polypeptide in the manufacture of a medicament for treating cancer in a subject in need thereof, wherein the ptide comprises (i) a transmembrane domain from CTLA4 or PD-1, (ii) an intracellular domain of an endogenous protein expressed on the surface of lymphocytes that triggers the activation and/or proliferation of said lymphocytes, and (iii) an extracellular domain that binds to an antigen, wherein if the transmembrane domain is from CTLA4, the intracellular domain and extracellular domain of said polypeptide are not from CTLA4; and if the transmembrane domain is from PD-1, the intracellular domain and extracellular domain of said polypeptide are not from PD-1.

2. The use of claim 1, wherein said polypeptide is a chimeric antigen or (CAR).

3. The use of claim 1 or claim 2, wherein a T lymphocyte sing said polypeptide is activated or ated to proliferate when said polypeptide binds to said antigen.

4. The use of any one of claims 1-3, wherein said polypeptide, when expressed on the surface of a T lymphocyte, directs the T cyte to kill a cell expressing said antigen.

5. The use of any one of claims 1-4, wherein the CTLA4 transmembrane domain is the polypeptide sequence encoded by exon 3 of a human CTLA4 gene.

6. The use of any one of claims 1-4, wherein the CTLA4 transmembrane domain is or comprises the amino acid sequence of SEQ ID NO:1.

7. The use of any one of claims 1-4, wherein the CTLA4 transmembrane domain is or ses the amino acid ce of SEQ ID NO:2.

8. The use of any one of claims 1-4, wherein the CTLA4 transmembrane domain is or comprises the amino acid sequence of SEQ ID NO:3.

9. The use of any one of claims 1-4, wherein the CTLA4 transmembrane domain is or comprises the amino acid sequence of SEQ ID NO:4.

10. The use of any one of claims 1-4, wherein the CTLA4 transmembrane domain is or comprises the amino acid sequence of SEQ ID NO:5.

11. The use of any one of claims 1-4, wherein the PD-1 embrane domain is or comprises the polypeptide ce of SEQ ID NO:6.

12. The use of any one of claims 1-4, wherein the PD-1 transmembrane domain is or comprises the polypeptide sequence of SEQ ID NO:7.

13. The use of any one of claims 1-4, wherein the PD-1 transmembrane domain is or comprises the polypeptide sequence of SEQ ID NO:8.

14. The use of any one of claims 1-13, wherein said extracellular domain comprises a receptor, or a portion of a receptor, that binds to said antigen.

15. The use of any one of claims 1-13, wherein said extracellular domain is a receptor, or a portion of a receptor, that binds to said antigen.

16. The use of any one of claims 1-13, wherein said extracellular domain comprises an antibody or an antigen-binding portion thereof.

17. The use of any one of claims 1-13, wherein said extracellular domain is an antibody or an n-binding portion thereof.

18. The use of any one of claims 1-13, n said extracellular domain comprises a -chain Fv .

19. The use of claim 18, wherein said single-chain Fv domain comprises a VL linked to VH by a flexible linker, n said VL and VH are from an antibody that binds said antigen.

20. The use of any one of claims 1-19, wherein said antigen is an antigen on a tumor cell.

21. The use of claim 20, wherein said tumor cell is a cell in a solid tumor.

22. The use of claim 20, n said tumor cell is a cell of a blood cancer.

23. The use of any one of claims 1-22, wherein said antigen is a tumor-associated antigen or a tumor-specific antigen.

24. The use of claim 23, wherein said tumor-associated antigen or tumor-specific antigen is Her2, prostate stem cell antigen (PSCA), alpha-fetoprotein (AFP), carcinoembryonic antigen (CEA), cancer antigen-125 (CA-125), CA19-9, calretinin, MUC-1, epithelial membrane protein (EMA), epithelial tumor antigen (ETA), tyrosinase, melanoma-associated antigen , CD34, CD45, CD99, CD117, chromogranin, cytokeratin, desmin, glial fibrillary acidic protein , gross cystic disease fluid n (GCDFP-15), HMB-45 antigen, protein melan-A (melanoma antigen recognized by T lymphocytes; MART-1), , muscle-specific actin (MSA), neurofilament, neuron-specific enolase (NSE), placental alkaline phosphatase, synaptophysis, thyroglobulin, thyroid transcription factor-1, the dimeric form of the pyruvate kinase isoenzyme type M2 (tumor M2-PK), CD19, CD22, CD27, CD30, CD70, GD2 ioside G2), EGFRvIII (epidermal growth factor variant III), sperm n 17 (Sp17), mesothelin, PAP (prostatic acid phosphatase), prostein, TARP (T cell receptor gamma alternate reading frame protein), Trp-p8, STEAP1 (six-transmembrane epithelial antigen of the prostate 1), an al ras protein, an abnormal p53 protein, integrin αvβ3 (CD61), in, K-Ras (VKi-ras2 Kirsten rat sarcoma viral oncogene), or Ral-B.

25. The use of any one of claims 1-24, wherein said extracellular domain is joined to said transmembrane domain by a linker, spacer or hinge ptide sequence.

26. The use of claim 25, wherein said linker, spacer or hinge polypeptide sequence is from CD28.

27. The use of claim 25, wherein said linker, spacer or hinge polypeptide sequence is from CTLA4.

28. The use of claim 25, wherein said linker, spacer or hinge polypeptide is from PD-

29. The use of any one of claims 1-28, wherein said intracellular domain is an intracellular domain of a n that is expressed on the surface of T cells and triggers activation and/or proliferation of said T cells.

30. The use of claim 29, wherein said intracellular domain is a CD3ζ intracellular signaling domain.

31. The use of claim 29, wherein said intracellular domain is from a lymphocyte receptor chain, a 3 complex protein, an Fc receptor subunit or an IL-2 receptor subunit.

32. The use of any one of claims 1-31, wherein said polypeptide additionally comprises one or more co-stimulatory domains.

33. The use of claim 32, wherein said one or more co-stimulatory domains comprises one or more of a co-stimulatory CD27 ptide sequence, a co-stimulatory CD28 polypeptide sequence, a co-stimulatory OX40 (CD134) polypeptide sequence, a co-stimulatory 4-1BB (CD137) polypeptide sequence, or a co-stimulatory inducible T-cell costimulatory (ICOS) polypeptide sequence.

34. The use of any one of claims 1-33, wherein said polypeptide comprises, in order, from N-terminus to C-terminus: (i) the ellular domain that binds to an antigen-; (ii) a CD28 or CTLA4 hinge polypeptide sequence; (iii) the transmembrane domain from CTLA4 or PD-1; (iv) a costimulatory domain; and (v) the CD3ζ intracellular signaling domain.

35. The use of claim 34, wherein said ptide comprises, in order, from N- terminus to C-terminus: (i) the extracellular domain comprising a single-chain Fv domain comprising a VL linked to VH by a flexible , wherein said VL and VH are from an antibody that binds said antigen; (ii) a CD28 hinge ptide sequence; (iii) the transmembrane domain from CTLA4; (iv) a CD28 costimulatory domain; and (v) the CD3ζ intracellular signaling domain.

36. The use of claim 34, wherein said polypeptide comprises, in order, from N- terminus to inus: (i) the extracellular domain comprising a single-chain Fv domain comprising a VL linked to VH by a flexible linker, wherein said VL and VH are from an antibody that binds said antigen; (ii) a CTLA4 hinge polypeptide ce; (iii) the transmembrane domain from CTLA4; (iv) a CD28 costimulatory domain; and (v) the CD3ζ intracellular ing domain.

37. The use of claim 34, wherein said polypeptide comprises, in order, from N- terminus to C-terminus: (i) the extracellular domain comprising a single-chain Fv domain comprising a VL linked to VH by a flexible linker, wherein said VL and VH are from an antibody that binds said antigen; (ii) a CD28 hinge polypeptide sequence; (iii) the transmembrane domain from PD-1; (iv) a CD28 ulatory domain; and (v) the CD3ζ intracellular signaling domain.

38. The use of claim 34, n said polypeptide comprises, in order, from N- terminus to C-terminus: (i) the extracellular domain comprising a single-chain Fv domain comprising a VL linked to VH by a flexible linker, wherein said VL and VH are from an antibody that binds said antigen; (ii) a CTLA4 hinge polypeptide sequence; (iii) the transmembrane domain from PD-1; (iv) a CD28 costimulatory domain; and (v) the CD3ζ intracellular signaling domain.

39. The use of claim 34, wherein said polypeptide comprises, in order, from N- terminus to C-terminus: (i) the extracellular domain comprising a single-chain Fv domain comprising a VL linked to VH by a flexible linker, n said VL and VH are from an antibody that binds said antigen; (ii) a PD-1 hinge polypeptide sequence; (iii) the transmembrane domain from CTLA4; (iv) a CD28 costimulatory domain; and (v) the CD3ζ ellular signaling domain.

40. The use of claim 34, wherein said polypeptide ses, in order, from N- terminus to C-terminus: (i) the extracellular domain comprising a single-chain Fv domain comprising a VL linked to VH by a flexible linker, wherein said VL and VH are from an antibody that binds said antigen; (ii) a PD-1 hinge polypeptide sequence; (iii) the transmembrane domain from PD-1; (iv) a CD28 costimulatory ; and (v) the CD3ζ intracellular signaling domain.

41. Use of a T lymphocyte comprising a membrane-bound polypeptide in the manufacture of a medicament for treating cancer in a subject in need thereof, wherein said polypeptide ses (i) a transmembrane domain from CTLA4 or PD-1 ammed Cell Death 1), (ii) an intracellular domain of an endogenous protein expressed on the e of lymphocytes and that triggers the activation and/or proliferation of said cytes, and (iii) an extracellular domain that binds to an antigen, wherein if the transmembrane domain is from CTLA4, the intracellular domain and extracellular domain of said polypeptide are not from CTLA4; and if the transmembrane domain is from PD-1, the ellular domain and extracellular domain of said polypeptide are not from PD-1.

42. The use of claim 41, wherein said polypeptide is a chimeric antigen receptor (CAR).

43. The use of claim 41 or claim 42, wherein a T lymphocyte expressing said polypeptide is activated or stimulated to proliferate when said polypeptide binds to said antigen.

44. The use of any one of claims 41-43, wherein said polypeptide, when expressed on the surface of the T lymphocyte, directs the T lymphocyte to kill a cell expressing said antigen.

45. The use of any one of claims 41-44, wherein the CTLA4 transmembrane domain is the polypeptide ce encoded by exon 3 of a human CTLA4 gene.

46. The use of any one of claims 41-44, wherein the CTLA4 transmembrane domain is or comprises the amino acid sequence of SEQ ID NO:1.

47. The use of any one of claims 41-44, wherein the CTLA4 transmembrane domain is or comprises the amino acid sequence of SEQ ID NO:2.

48. The use of any one of claims 41-44, wherein the CTLA4 transmembrane domain is or comprises the amino acid sequence of SEQ ID NO:3.

49. The use of any one of claims 41-44, wherein the CTLA4 transmembrane domain is or comprises the amino acid sequence of SEQ ID NO:4.

50. The use of any one of claims 41-44, wherein the CTLA4 transmembrane domain is or ses the amino acid sequence of SEQ ID NO:5.

51. The use of any one of claims 41-44, wherein the PD-1 transmembrane domain is or comprises the polypeptide sequence of SEQ ID NO:6.

52. The use of any one of claims 41-44, wherein the PD-1 transmembrane domain is or comprises the polypeptide sequence of SEQ ID NO:7.

53. The use of any one of claims 41-44, wherein the PD-1 transmembrane domain is or comprises the polypeptide ce of SEQ ID NO:8.

54. The use of any one of claims 41-53, wherein said extracellular domain comprises a receptor, or a portion of a receptor, that binds to said n.

55. The use of any one of claims 41-53, wherein said ellular domain is a receptor, or a portion of a receptor, that binds to said antigen.

56. The use of any one of claims 41-53, wherein said ellular domain comprises an antibody or an antigen-binding portion thereof.

57. The use of any one of claims 41-53, wherein said extracellular domain is an antibody or an antigen-binding portion thereof.

58. The use of any one of claims 41-53, wherein said extracellular domain comprises a single-chain Fv domain.

59. The use of claim 58, wherein said single-chain Fv domain comprises a VL linked to VH by a flexible linker, wherein said VL and VH are from an antibody that binds said antigen.

60. The use of any one of claims 41-59, wherein said antigen is an antigen on a tumor cell.

61. The use of claim 60, wherein said tumor cell is a cell in a solid tumor.

62. The use of claim 60, wherein said tumor cell is a cell of a blood cancer.

63. The use of any one of claims 41-62, wherein said antigen is a tumor-associated antigen or a tumor-specific antigen.

64. The use of claim 63, wherein said tumor-associated antigen or tumor-specific antigen is Her2, te stem cell antigen (PSCA), alpha-fetoprotein (AFP), oembryonic antigen (CEA), cancer antigen-125 (CA-125), CA19-9, calretinin, MUC-1, epithelial membrane protein (EMA), epithelial tumor antigen (ETA), tyrosinase, melanoma-associated antigen (MAGE), CD34, CD45, CD99, CD117, chromogranin, cytokeratin, desmin, glial fibrillary acidic n (GFAP), gross cystic disease fluid protein (GCDFP-15), HMB-45 n, protein melan-A (melanoma antigen recognized by T lymphocytes; MART-1), , muscle-specific actin (MSA), neurofilament, neuron-specific enolase (NSE), placental alkaline phosphatase, synaptophysis, thyroglobulin, thyroid transcription factor-1, the dimeric form of the pyruvate kinase isoenzyme type M2 (tumor M2-PK), an al ras protein, an abnormal p53 protein, CD19, CD22, CD27, CD30, CD70, GD2 (ganglioside G2), EGFRvIII (epidermal growth factor variant III), sperm n 17 (Sp17), mesothelin, PAP (prostatic acid phosphatase), prostein, TARP (T cell or gamma alternate reading frame protein), Trp-p8, STEAP1 (sixtransmembrane lial antigen of the prostate 1), an abnormal ras protein, an abnormal p53 protein, integrin αvβ3 (CD61), galactin, K-Ras ras2 Kirsten rat sarcoma viral oncogene), or Ral-B.

65. The use of any one of claims 41-64, wherein said extracellular domain is joined to said transmembrane domain by a linker, spacer or hinge ptide sequence.

66. The use of claim 65, wherein said linker, spacer or hinge polypeptide sequence is from CD28.

67. The use of claim 65, wherein said linker, spacer or hinge polypeptide sequence is from CTLA4.

68. The use of claim 65, wherein said linker, spacer or hinge polypeptide sequence is from PD-1.

69. The use of any one of claims 41-68, wherein said intracellular domain is an intracellular domain of a protein that is expressed on the surface of T cells and triggers tion and/or proliferation of said T cells.

70. The use of claim 69, wherein said intracellular domain is a CD3ζ intracellular signaling domain.

71. The use of claim 69, wherein said intracellular domain is from a lymphocyte or chain, a 3 complex protein, an Fc receptor subunit or an IL-2 receptor subunit.

72. The use of any one of claims 41-71, wherein said ptide additionally comprises one or more co-stimulatory s.

73. The use of claim 72, wherein said one or more co-stimulatory domains comprises one or more of a co-stimulatory CD27 polypeptide sequence, a co-stimulatory CD28 polypeptide sequence, a co-stimulatory OX40 (CD134) polypeptide sequence, a co-stimulatory 4-1BB (CD137) polypeptide ce, or a co-stimulatory inducible T-cell costimulatory (ICOS) polypeptide ce.

74. The use of any one of claims 41-73, wherein said polypeptide comprises, in order, from N-terminus to C-terminus: (i) the extracellular domain that binds to an antigen; (ii) a CD28 or CTLA4 hinge polypeptide sequence; (iii) the transmembrane domain from CTLA4 or PD-1; (iv) a costimulatory domain; and (v) the CD3ζ intracellular signaling domain.

75. The use of claim 74, n said polypeptide comprises, in order, from N- us to C-terminus: (i) the extracellular domain comprising a single-chain Fv domain comprising a VL linked to VH by a flexible linker, wherein said VL and VH are from an antibody that binds said antigen; (ii) a CD28 hinge polypeptide sequence; (iii) the transmembrane domain from CTLA4; (iv) a CD28 costimulatory domain; and (v) the CD3ζ intracellular signaling domain.

76. The use of claim 74, wherein said polypeptide comprises, in order, from N- terminus to C-terminus: (i) the extracellular domain comprising a single-chain Fv domain comprising a VL linked to VH by a flexible linker, wherein said VL and VH are from an antibody that binds said antigen; (ii) a CTLA4 hinge polypeptide sequence; (iii) the transmembrane domain from CTLA4; (iv) a CD28 costimulatory domain; and (v) the CD3ζ intracellular signaling domain.

77. The use of claim 74, wherein said polypeptide comprises, in order, from N- terminus to C-terminus: (i) the ellular domain comprising a single-chain Fv domain comprising a VL linked to VH by a flexible linker, wherein said VL and VH are from an antibody that binds said antigen; (ii) a CD28 hinge polypeptide ce; (iii) the transmembrane domain from PD-1; (iv) a CD28 costimulatory domain; and (v) the CD3ζ intracellular signaling domain.

78. The use of claim 74, wherein said polypeptide comprises, in order, from N- terminus to C-terminus: (i) the extracellular domain comprising a single-chain Fv domain sing a VL linked to VH by a flexible linker, wherein said VL and VH are from an antibody that binds said n; (ii) a CTLA4 hinge polypeptide sequence; (iii) the embrane domain from PD-1; (iv) a CD28 costimulatory domain; and (v) the CD3ζ intracellular signaling domain.

79. The use of claim 74, wherein said polypeptide comprises, in order, from N- terminus to C-terminus: (i) the extracellular domain comprising a single-chain Fv domain comprising a VL linked to VH by a flexible linker, wherein said VL and VH are from an antibody that binds said antigen; (ii) a PD-1 hinge polypeptide sequence; (iii) the transmembrane domain from CTLA4; (iv) a CD28 costimulatory domain; and (v) the CD3ζ intracellular signaling domain.

80. The use of claim 74, n said polypeptide comprises, in order, from N- terminus to C-terminus: (i) the ellular domain sing a -chain Fv domain comprising a VL linked to VH by a flexible linker, wherein said VL and VH are from an antibody that binds said antigen; (ii) a PD-1 hinge polypeptide sequence; (iii) the transmembrane domain from PD-1; (iv) a CD28 costimulatory domain; and (v) the CD3ζ intracellular signaling domain.

81. The use according to claim 1, substantially as herein described or exemplified.

82. The use according to claim 41, substantially as herein bed or exemplified. 1/