WO2014144622A2 - Cd123-specific chimeric antigen receptor redirected t cells and methods of their use - Google Patents
Cd123-specific chimeric antigen receptor redirected t cells and methods of their use Download PDFInfo
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- WO2014144622A2 WO2014144622A2 PCT/US2014/029109 US2014029109W WO2014144622A2 WO 2014144622 A2 WO2014144622 A2 WO 2014144622A2 US 2014029109 W US2014029109 W US 2014029109W WO 2014144622 A2 WO2014144622 A2 WO 2014144622A2
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Definitions
- Acute myeloid leukemia is a disease characterized by the rapid proliferation of immature myeloid cells in the bone marrow resulting in dysfunctional hematopoiesis [1 ].
- First-line treatments for acute myeloid leukemia (AML) have remained largely unchanged for nearly 50 years and AML remains a disease of poor prognosis.
- standard induction chemotherapy can induce complete remissions, many patients eventually relapse and succumb to the disease [2].
- Allogeneic hematopoietic cell transplantation can achieve cure of the disease in selected patients and highlights the susceptibility of AML to donor derived immunotherapy. Additionally, the interleukin 3 receptor alpha chain (CD123) has been identified as a potential immunotherapeutic target since it is over-expressed on AML compared to normal hematopoietic stem cells.
- CD123 interleukin 3 receptor alpha chain
- CD123 is expressed on various malignancies including acute and chronic myeloid leukemia, hairy cell leukemia, B-cell lineage acute lymphoblastic leukemia, and blastic plasmacytoid dendritic cell neoplasms.
- CD123 is not typically expressed on normal hematopoietic stem cells, thus making CD123 an ideal immunotherapeutic target. Additionally, two phase I trials for CD123-specific therapeutics have been completed with both drugs displaying good safety profiles (ClinicalTrials.gov I D: NCT00401739 and NCT00397579). Unfortunately, these CD123 targeting drugs had limited efficacy suggesting that alternative, and more potent therapies targeting CD123 may be required to observe anti-leukemic activity.
- a possibly more potent alternative therapy for the treatment of AML is the use of T cells expressing chimeric antigen receptors (CARs) that redirect T cell specificity towards cell surface tumor associated antigens (TAAs) in an MHC- independent manner [5].
- CARs include a single-chain variable fragment (scFv) from a monoclonal antibody fused to the signaling domain of CD3C, and may contain a costimulatory endodomain [5].
- scFv single-chain variable fragment
- Several groups have developed CARs targeting various antigens for the treatment of B-cell malignancies [6-10] and many have gone on to evaluating CAR expressing T cells in phase I clinical trials [1 1 -15]. In contrast, CAR engineered T cells for the treatment of AM L remain scarce [16, 17].
- AM L targeting immunotherapies including antigen specific cytotoxic T lymphocytes, alloreactive natural killer cells, and dendritic cell vaccines are currently being developed. For example, Oka and colleagues have demonstrated that Wilms' Tumor 1 peptide vaccination can lead to clinical and immunological responses in AML patients [33].
- these targeting therapies are HLA-dependent. To this end, it would be desirable to design a targeted therapeutic, such as a CAR, that can redirect T cell specificity to selectively target AML cells in an HLA-independent manner.
- CD123CAR chimeric antigen receptors
- CD123CAR chimeric antigen receptor
- such a CD123 chimeric antigen receptor (CD123CAR) gene includes an anti-CD123 scFv region fused in frame to a modified lgG4 hinge region comprising an alteration of an lgG4 spacer region that would eliminate Fc receptor binding.
- the modified lgG4 hinge region includes an S228P substitution, an L235E substitution, and optionally an N297Q substitution.
- the CD123CAR gene also includes at least one costimulatory signaling domain; and a T cell receptor (TCR) zeta chain signaling domain.
- TCR T cell receptor
- CD123CAR gene includes a nucleotide sequence selected from SEQ ID NO:1 , SEQ ID NO:2, SEQ ID NO:3, or SEQ ID NO:4.
- the CD123CAR gene encodes an amino acid sequence that includes SEQ ID NO:9; SEQ ID NO:10, SEQ ID NO:1 1 , or SEQ ID NO:12.
- the CD123CAR genes may be part of an expression cassette that is inserted within a vector (e.g., a viral vector).
- a vector e.g., a viral vector
- a population of human T cells may be transduced by the vector, resulting the expression of the CD123CAR genes by the T cells.
- CD123CARs redirect T cell specificity and mediated potent effector activity against CD123+ cell lines as well as primary AML patient samples. CD123CAR T cells did not significantly alter
- T cells obtained from patients with active AML can be modified to express CD123CAR genes and are able to lyse autologous AML blasts in vitro.
- CD123CAR-transduced T cells may be used as an immunotherapy for the treatment of high risk AML.
- methods of treating AML in a subject include a step of administering a first population of T cells transduced with a first CD123CAR gene to the subject.
- the methods may further comprise an additional step of administering the first population of T cells transfected with the first CD123CAR gene in combination with a second population of T cells transduced with a second CD123CAR gene to the subject.
- the first population of T cells transfected with the first CD123CAR gene in combination with a second population of T cells transduced with a second CD123CAR gene to the subject.
- CD123CAR gene include a nucleotide sequence selected from SEQ ID NO:3 or SEQ ID NO:4.
- the second CD123CAR gene may also include a nucleotide sequence selected from SEQ ID NO:3 or SEQ ID NO:4, however, the nucleotide sequence of the second CD123CAR gene may not the same as that selected for the first CD123CAR gene. This results in a combination treatment of AM L using two or more different CD123CAR-transduced T cell populations, which may cause a synergistic effect when compared to using s single CD123CAR-transduced T cell population.
- FIG. 1 shows that CD123-specific CARs can be expressed in healthy donor human T cells.
- A Schematic diagram of the CAR containing a modified lgG4 hinge, a modified transmembrane and intracellular signaling domain of CD28, and the CD3C, signaling domain. The T2A ribosomal skip sequence and the truncated EGFR (EGFRt) transduction marker are also indicated.
- B Representative phenotype of mock and lenti-transduced T cells derived from a single healthy donor.
- CAR modified T cells were stained with biotinylated anti-Fc or biotinylated anti-EGFR followed by PE- conjugated streptavidin and anti-TCRa/ ⁇ , anti-CD4, or anti-CD8 and analyzed by flow cytometry. Quadrant placement is based on staining with isotype controls, and the percentage of cells falling in each quadrant is indicated.
- C Expression of indicated cell surface markers from three different health donor T cell lines following immunomagnetic selection and one cycle of expansion. Data represents mean values ⁇ SEM.
- FIG. 2 shows that CD123-specific CAR expressing T cells lyse CD123-expressing tumor cell lines.
- A Flow Anac analysis of 293T cells transiently transfected to express CD123 (top, black line) or CD19 (bottom, black line). Parental mock transduced 293T cells were stained with either anti-CD123 or anti-CD19 antibodies (grey filled, top and bottom) to determine background expression levels.
- B Specific cytotoxicity of CD123-CAR expressing T cells (26292 and 3271 6) against 293T cells expressing either CD123 (293T-CD123) or CD19 (293T-CD19) by chromium release assay. Data represents mean values of triplicate wells + S.D.
- (C) Flow Analogous leukemia of CD123 on the AML cell line KG1 a, the EBV-transformed LCL cell line, and the CML cell line K562. Percentage of cells positive for CD123 staining (black line) over isotype controls (grey filled) are indicated in each histogram.
- FIG. 3 shows that CD123-specific T cells release INF- ⁇ and TNF-a and proliferate in response to CD123 expressing target cells.
- CD123 CAR T cells, or control pairmatched T cells, from three healthy donors were cocultured with the indicated cell lines for 24 hours at an E:T of 10:1 and the release of IFN- ⁇ and TNF-a were quantified by Luminex multiplex bead technology.
- B Pair-matched CFSE labeled CD19 or CD123 specific T cells were cocultured with the indicated stimulator cell lines for 96 hours at an E:T of 2:1 , and analyzed by flow cytometry for CFSE dilution. Unstimulated T cells (filled histograms) were used as baseline T cell proliferation controls.
- Figure 4 shows activation of multiple CD4 and CD8 effector functions by CD123 specific CARs following coculture with primary AML samples. Pair- matched CAR engineered T cells were cocultured for six hours with three different primary AML patient samples (AML 179, 373, and 605) and analyzed for surface CD107a expression and intracellular IFN- ⁇ or TNF-a production.
- A bar graphs
- A pie charts. The fractions of CD3+CD8+ EGFRt+ cells undergoing degranulation and producing IFN- ⁇ and/or TNF-a are plotted in the pie charts.
- C Pair-matched CFSE labeled CD19 or CD123-specific T cells were cocultured with the indicated stimulator cells for 72 hours at an E:T of 2:1 , and analyzed by flow cytometry for CFSE dilution in the DAPICD3+ EGFRt+ population.
- LCL and K562 cell lines serve as positive and negative 27 controls, respectively.
- Pre B-ALL 802 is a primary patient sample double positive for CD19 and CD123. Quadrant placement is based on unstimulated T cells.
- FIG. 5 shows that primary AML cells are specifically targeted by CD123 specific T cells.
- A Pair-matched CD19 or CD123-specific T cells were cocultured for 4 hours with 51 Cr labeled CD34+ primary AML samples at an E:T of 25:1 .
- LCL and K562 cell lines serve as positive and negative controls, respectively.
- Pre B-ALL 802 is a primary patient sample double positive for CD19 and CD123. Data represents mean values of triplicate wells + S.D.
- B Specific lysis of AML blasts from the three primary AML patient samples in (A). Data represents mean values ⁇ SEM. *, p ⁇ 0.05 and **,p ⁇ 0.0005 using the unpaired Student's t-test comparing 26292 and 32716 to CD19R.
- FIG. 6 shows the effect of CD123 CAR expressing T cells on normal and leukemic progenitor cells in vitro.
- the cells were then plated in semisolid methylcellulose progenitor culture for 14-18 days and scored for the presence of granulocyte-macrophage colony forming unit (CFU-GM, A) and burst forming unit erythroid (BFU-E, B) colonies. Percentages are normalized to CD19-specific T cell controls.
- CFU-GM granulocyte-macrophage colony forming unit
- BFU-E burst forming unit erythroid
- Data represents mean values ⁇ SEM for three different CB samples.
- C CD34+ primary AML patient samples (AML 493, 519, or 545) were immunomagnetically selected and cocultured with either CD19 or CD123-specific pairmatched T cells or media alone (untreated) for 4 hours at an E:T of 25:1 . The cells were then plated in semisolid methylcellulose progenitor culture for 14-18 days and scored for the presence of leukemia colony forming units (CFU-L). Percentages are normalized to CD19-specific T cell controls. Data represents mean values ⁇ SEM for three different primary AML patient samples. *, p ⁇ 0.05 using the unpaired Student's t-test comparing 26292 and 32716 to CD19R.
- FIG. 7 shows that CD123 CAR redirected T cells derived from AML patients specifically lyse autologous blasts in vitro.
- A T cells from three AML patients were lentivirally transduced to express either CD19R, 26292, or 32716 CARs. Shown are T cell lines from AML 722 19 days post-transduction.
- B CD123 expression on target cells used in 51 Cr release assay. The percentage of CD123+ cells and the relative fluorescence index (RFI) of each sample is indicated.
- C Results of 4 hour autologous killing assays using T cells engineered from three AML patient samples as effectors and 51 Cr-labeled autologous CD34-enriched blasts as target cells. Data represents mean values of triplicate wells + S.D.
- Figure 8 shows changes in tumor size as shown by bioluminescent imaging of NSG mice that were treated five days after injection of the AML cell line KG 1 a modified to express firefly luciferase (day 5) with CD123CAR-transduced T cells (26292) containing either the S228P+L235E mutations or the S228P+L235E+N297Q mutations.
- Figure 9 shows a schematic diagram of a chimeric antigen receptor (CAR) having an antigen-specific single-chain Fv, a hinge region, a costimulatory signaling domain, and T cell Receptor zeta-chain signaling domain in accordance with some embodiments.
- CAR chimeric antigen receptor
- Figure 10 shows a schematic diagram of the 32716CAR construct having an L235E mutation and an S228P mutation ("32716CAR(S228P+L235E)”) along with the nucleotide sequence of the 32716CAR(S228P+L235E) construct (SEQ ID NO:1 - antisense strand (top numbered strand); SEQ ID NO:5 - sense strand (bottom unnumbered strand)) and the amino acid sequence of the
- Figure 1 1 shows a schematic diagram of the 26292CAR construct having an L235E mutation and an S228P mutation ("26292CAR(S228P+L235E)”) along with the nucleotide sequence of the 26292CAR(S228P+L235E) construct (SEQ ID NO:2 - antisense strand (top numbered strand); SEQ ID NO:6 - sense strand (bottom unnumbered strand)) and the amino acid sequence of the
- 26292CAR(S228P+L235E) construct (SEQ ID NO:10) according to some embodiments. Mutations are shown in bold.
- Figure 12 shows a schematic diagram of the 32716CAR construct having an L235E mutation, an S228P mutation and an N297Q mutation
- 32716CAR(S228P+L235E+N297Q) along with the nucleotide sequence of the 32716CAR(S228P+L235E+N297Q) construct (SEQ ID NO:3 - antisense strand (top numbered strand); SEQ ID NO:7 - sense strand (bottom unnumbered strand)) and the amino acid sequence of the 32716CAR(S228P+L235E+N297Q) construct (SEQ ID NO:1 1 ) according to some embodiments. Mutations are shown highlighted, in bold and underlined. lUPAC base code R corresponds to an A or G, and lUPAC base code Y corresponds to a T or C.
- FIG. 13 shows a schematic diagram of the 26292CAR construct having an L235E mutation, an S228P mutation and an N297Q mutation ("26292CAR(S228P+L235E+N297Q)”) along with the nucleotide sequence of the 26292CAR(S228P+L235E+N297Q) construct (SEQ ID NO:4 - antisense strand (top numbered strand); SEQ ID NO:8 - sense strand (bottom unnumbered strand)) and the amino acid sequence of the 26292CAR(S228P+L235E+N297Q) construct (SEQ ID NO:12) according to some embodiments. Mutations are shown in bold. lUPAC base code R corresponds to an A or G, and lUPAC base code Y corresponds to a T or C.
- Figure 14 shows CD123 expression on primary AML samples and cord blood.
- A Representative example of CD123 expression on primary AML cells. Cells were gated on the DAP iineage " CD34 + population and assessed for CD123 expression (black - isotype control, red - anti-CD123).
- B Percentage of CD123 positive cells expressed in the DAP iineage " CD34 + population. Each point represents an individual sample.
- C CD123 relative fluorescence index (RFI) in the DAP iineage " CD34 + population. RFI is calculated by dividing the median of anti- CD123 cells by the median of isotype control stained cells.
- D Histogram overlay of CD123 expression on AML 605 (red), AML 722 (blue), and a cord blood sample (gray). Isotype control shown in black.
- Figure 15 illustrates a gating strategy used to investigate the activation of multiple effector functions by CD123-specific T cells in response to incubation with primary AML patient samples.
- the gating strategy for polychromatic flow cytometry to identify T cell effector functions is shown for CD123 CAR (26292-based) T cells following co-culture with AML 373.
- A An initial gate is set on CD3 + cells.
- B A secondary gate, established using a fluorescence minus one control, is set on EGFRt + cells.
- C A tertiary gate is set for CD4 + and CD8 + populations.
- D A final gate is set on CD107a + cells.
- Figure 16 shows CFSE that is diluted in both the CD4 and CD8 populations of CAR-expressing T cells.
- the CD4 (A) and CD8 (B) subpopulations of the cells shown in Figure 5C are shown here.
- CD4 and CD8 cells were analyzed for CFSE dilution following co- culture with primary AML patient samples. Quadrant placement is based on unstimulated T cells. DETAILED DESCRIPTION
- a gene encoding a tumor targeting chimeric antigen receptor is provided.
- the gene encodes a CD123-specific CAR (CD123CAR).
- CD123CAR gene includes an anti- CD123 single-chain Fv (scFv) region and one or more of the following domains: a hinge region, a costimulatory signaling domain, an intracellular signaling domain, or a combination thereof.
- a CD123CAR gene may include, but is not limited to, an anti-CD123 single-chain Fv (scFv) region, a hinge region, optionally, at least one costimulatory signaling domain, and optionally, an intracellular signaling domain.
- scFv anti-CD123 single-chain Fv
- a CD123CAR gene may include, but is not limited to, an anti-CD123 single-chain Fv (scFv) region, a hinge region, at least one costimulatory signaling domain, and an intracellular signaling domain (Figure 9).
- scFv anti-CD123 single-chain Fv
- Figure 9 intracellular signaling domain
- the anti-CD123 scFv region may include a nucleotide sequence that, when expressed, may bind an epitope of CD123.
- the scFv anti-CD123 scFv region includes a nucleotide which encodes a VH and a VL domain of recombinant immunotoxins (RITs) 26292 and 32716 [18].
- RITs recombinant immunotoxins
- a CD123CAR gene that targets 26292 and a CD123CAR gene that targets 32716 is also referred to herein as a 26292CAR and a 32716CAR, respectively.
- an anti- CD123 scFv region may include a nucleotide sequence selected from the following: nucleotides 82-814 of SEQ ID NO:1 or SEQ ID NO:3 for a 32716CAR nucleotides 82-792 of SEQ ID NO:2 or SEQ ID NO:4 for a 26292CAR; or
- Said nucleotide sequences encode amino acid sequences selected from the following: residues 23-266 of SEQ ID NO:9 or SEQ ID NO:1 1 when used in a
- the anti-CD123 scFv region may be modified to enhance binding or to reduce immunogenicity.
- the anti-CD123 scFv region may be a humanized anti-CD123 scFv region.
- the hinge region may include at least a portion of an immunoglobulin (e.g., lgG1 , lgG2, lgG3, lgG4) that falls between the CH2-CH3 domains.
- the hinge regions is a modified hinge.
- the modified hinge may have one or more amino acid substitutions or modifications that contribute to reducing the CD123CAR's off-target effects, thereby increasing its specificity and efficacy.
- An "amino acid modification” or an "amino acid substitution” or a “substitution,” as used herein, mean an amino acid substitution, insertion, and/or deletion in a protein or peptide sequence.
- amino acid substitution or “substitution” as used herein, means a replacement of an amino acid at a particular position in a parent peptide or protein sequence with another amino acid.
- substitution S228P refers to a variant protein or peptide, in which the serine at position 228 is replaced with proline.
- Amino acid substitutions can be made by mutation such that a particular codon in the nucleic acid sequence encoding the protein or peptide is changed to a codon which codes for a different amino acid. Such a mutation is generally made by making the fewest nucleotide changes possible.
- a substitution mutation of this sort can be made to change an amino acid in the resulting protein in a non-conservative manner (i.e., by changing the codon from an amino acid belonging to a grouping of amino acids having a particular size or characteristic to an amino acid belonging to another grouping) or in a conservative manner (i.e., by changing the codon from an amino acid belonging to a grouping of amino acids having a particular size or characteristic to an amino acid belonging to the same grouping). Such a conservative change generally leads to less change in the structure and function of the resulting protein.
- Amino acids with nonpolar R groups Alanine, Valine, Leucine, Isoleucine, Proline, Phenylalanine, Tryptophan, Methionine
- Amino acids with uncharged polar R groups Glycine, Serine, Threonine, Cysteine, Tyrosine, Asparagine, Glutamine
- Another grouping may be those amino acids with phenyl groups:
- Another grouping may be according to molecular weight (i.e., size of R groups) as shown below:
- the modified hinge is derived from an lgG1 , lgG2, lgG3, or lgG4 that includes one or more amino acid residues substituted with an amino acid residue different from that present in an unmodified hinge.
- the one or more substituted amino acid residues are selected from, but not limited to one or more amino acid residues at positions 220, 226, 228, 229, 230, 233, 234, 235, 234, 237, 238, 239, 243, 247, 267, 268, 280, 290, 292, 297, 298, 299, 300, 305, 309, 218, 326, 330, 331 , 332, 333, 334, 336, 339, or a combination thereof
- the modified hinge is derived from an lgG1 , lgG2, lgG3, or lgG4 that includes, but is not limited to, one or more of the following amino acid residue substitutions: C220S, C226S, S228P, C229S, P230S, E233P, V234A, L234V, L234F, L234A, L235A, L235E, G236A, G237A, P238S, S239D, F243L, P247I, S267E, H268Q, S280H, K290S, K290E, K290N, R292P, N297A, N297Q, S298A, S298G, S298D, S298V, T299A, Y300L, V305I, V309L, E318A, K326A, K326W, K326E, L328F, A330L, A
- the modified hinge is derived from an lgG4 hinge having the following amino acid sequence:
- the modified hinge is derived from lgG4 that includes one or more amino acid residues substituted with an amino acid residue different from that present in an unmodified hinge.
- the one or more substituted amino acid residues are selected from, but not limited to one or more amino acid residues at positions 220, 226, 228, 229, 230, 233, 234, 235, 234, 237, 238, 239, 243, 247, 267, 268, 280, 290, 292, 297, 298, 299, 300, 305, 309, 218, 326, 330, 331 , 332, 333, 334, 336, 339, or a combination thereof
- the modified hinge is derived from an lgG4 that includes, but is not limited to, one or more of the following amino acid residue substitutions: 220S, 226S, 228P, 229S, 230S, 233P, 234A, 234V, 234F, 234A, 235A, 235E, 236A, 237A, 238S, 239D, 243L, 247I, 267E, 268Q, 280H, 290S, 290E, 290N, 292P, 297A, 297Q, 298A, 298G, 298D, 298V, 299A, 300L, 305I, 309L, 318A, 326A, 326W, 326E, 328F, 330L, 330S, 331 S, 331 S, 332E, 333A, 333S, 333S, 334A, 339D, 339Q, 396L, or a combination thereof
- the modified lgG4 hinge includes, but is not limited to, a substitution of proline (P) in place of serine (S) at position 228 (S228P), a substitution of leucine (L) in place of glutamic acid (E) at position 235 (L235E), a substitution of asparagine (N) in place of glutamine (Q) at position 297 (N297Q).
- a modified lgG4 hinge region may include a nucleotide sequence selected from the following:
- Said nucleotide sequences encode amino acid sequences selected from the following:
- the modified lgG4 hinge region includes an S228P substitution and an L235E substitution ("S228P+L235E") (See Figures 10 and 1 1 ).
- the modified lgG4 hinge region includes an S228P substitution, an L235E substitution, and an N297Q substitution
- the hinge may be modified to substitute the Fc spacer region in the C123CAR for a spacer that has no Fc binding, such as the hinge region of CD8a.
- the Fc spacer region of the hinge may be deleted. Such substitutions would reduce or eliminate Fc binding.
- position is a location in the sequence of a protein. Positions may be numbered sequentially, or according to an established format, for example a Kabat position or an EU position or EU index as in Kabat. For all positions discussed herein, numbering is according to the EU index or EU numbering scheme (Kabat et al., 1991 , Sequences of Proteins of Immunological Interest, 5th Ed., United States Public Health Service, National Institutes of Health, Bethesda, hereby entirely incorporated by reference).
- the EU index or EU index as in Kabat or EU numbering scheme refers to the numbering of the EU antibody (Edelman et al., 1969, Proc Natl Acad Sci USA 63:78-85, which is hereby entirely incorporated by reference).
- Kabat positions while also well known in the art, may vary from the EU position for a given position.
- the S228P and L235E substitutions described above refer to the EU position.
- these substitutions may also correspond to Kabat positions 241 (S241 P) and 248 (L248E) [21 ].
- the costimulatory signaling domain may include any suitable costimulatory domain including, but not limited to a 4-1 BB costimulatory domain, an OX-40 costimulatory domain, a CD27 costimulatory domain, or a CD28 costimulatory domain.
- a CD123CAR may include at least one costimulatory signaling domain.
- the CD123CAR has a single costimulatory signaling domain, or it may include two or more costimulatory signaling domains such as those described above.
- the costimulatory domain may be made up of a single costimulatory domain such as those described above, or alternatively, may be made up of two or more portions of two or more costimulatory domains.
- the CD123CAR does not include a costimulatory signaling domain.
- the CD123CAR includes a costimulatory signaling domain which is a CD28 costimulatory domain.
- the CD28 signaling domain may include a modified CD28 transmembrane domain.
- such a modified CD28 transmembrane domain has one or more amino acid substitutions or modifications including, but not limited to a substitution of leucine-leucine (LL) to glycine-glycine (GG) at amino acid residues 530-531 of SEQ ID NO:10 or SEQ ID NO:12; or residues 523-524 of SEQ ID NO:1 1 or SEQ ID NO: 13 (e.g., RLLH ⁇ RGGH [22]).
- a modified costimulatory signaling domain region may include a nucleotide sequence selected from the following:
- Said nucleotide sequences encode amino acid sequences selected from the following:
- the intracellular signaling domain may include any suitable T cell receptor (TCR) complex, signaling domain portion thereof.
- TCR T cell receptor
- the intracellular signaling domain is a TCR zeta-chain ( ⁇ -chain) signaling domain.
- ⁇ -chain signaling domain may include a nucleotide sequence selected from the following:
- Said nucleotide sequences encode amino acid sequences selected from the following:
- the CD123CAR gene may include a nucleotide sequence selected from SEQ ID NO:1 , SEQ ID NO:2, SEQ ID NO:3 or SEQ ID NO:4.
- the CD123CAR gene may include a nucleotide sequence selected from SEQ ID NO:1 , SEQ ID NO:2, SEQ ID NO:3 or SEQ ID NO:4.
- CD123CAR gene may encode an amino acid sequence selected from SEQ ID NO:9, SEQ ID NO:10, SEQ ID NO:1 1 or SEQ ID NO: 12. ( Figures 10, 1 1 , 12, 13).
- the CD123CAR gene is part of an expression cassette.
- the expression cassette may - in addition to the CD123CAR gene - also include an accessory gene.
- the accessory gene When expressed by a T cell, the accessory gene may serve as a transduced T cell selection marker, an in vivo tracking marker, or a suicide gene for transduced T cells.
- the accessory gene is a truncated EGFR gene (EGFRt).
- EGFRt may be used as a non-immunogenic selection tool (e,g., immunomagnetic selection using biotinylated cetuximab in combination with anti- biotin microbeads for enrichment of T cells that have been lentivirally transduced with EGFRt-containing constructs), tracking marker (e.g., flow cytometric analysis for tracking T cell engraftment), and suicide gene (e.g., via Cetuximab/Erbitux® mediated antibody dependent cellular cytotoxicity (ADCC) pathways).
- EGFRt truncated EGFR gene
- the accessory gene is a truncated CD19 gene (CD19t).
- the accessory gene is an inducible suicide gene.
- a suicide gene is a recombinant gene that will cause the cell that the gene is expressed in to undergo programmed cell death or antibody mediated clearance at a desired time.
- an inducible suicide gene that may be used as an accessory gene is an inducible caspase 9 gene (see Straathof et al. (2005) An inducible caspase 9 safety switch for T-cell therapy. Blood. June 1 ; 105(1 1 ): 4247- 4254, the subject matter of which is hereby incorporated by reference as if fully set forth herein).
- the expression cassette that include a
- CD123CAR gene described above may be inserted into a vector for delivery - via transduction or transfection - of a target cell.
- Any suitable vector may be used, for example, a bacterial vector, a viral vector, or a plasmid.
- the vector is a viral vector selected from a retroviral vector, a lentiviral vector, a poxvirus vector, an adenoviral vector, or an adeno-associated viral vector.
- the vector may transduce a population of healthy T cells.
- Successfully transduced or transfected target cells express the one or more genes that are part of the expression cassette.
- one or more populations of T cells may be transduced with a CD123CAR gene.
- the CD123CAR gene includes a nucleotide sequence selected from SEQ ID NO:1 , SEQ ID NO:2, SEQ ID NO:3 or SEQ ID NO:4.
- the transduced T cells express a CD123CAR gene that encodes an amino acid sequence selected from SEQ ID NO:9, SEQ ID NO:10, SEQ ID NO:1 1 or SEQ ID NO:12. ( Figures 10, 1 1 , 12, 13).
- the transduced T cells may be from a donor, or may be from a subject having AML and who is in need of a treatment for AML.
- the transduced T cells are used in an adoptive immunotherapy treatment for the treatment of AML
- the one or more populations of T cells may be part of a pharmaceutically acceptable composition for delivery for administration to a subject.
- the pharmaceutically effective composition may include one or more pharmaceutically effective carriers.
- pharmaceutically acceptable carrier refers to a pharmaceutically acceptable material, composition, or vehicle that is involved in carrying or
- Such a carrier may comprise, for example, a liquid, solid, or semi-solid filler, solvent, surfactant, diluent, excipient, adjuvant, binder, buffer, dissolution aid, solvent, encapsulating material,
- sequestering agent dispersing agent, preservative, lubricant, disintegrant, thickener, emulsifier, antimicrobial agent, antioxidant, stabilizing agent, coloring agent, or some combination thereof.
- Each component of the carrier is "pharmaceutically acceptable" in that it must be compatible with the other ingredients of the composition and must be suitable for contact with any tissue, organ, or portion of the body that it may encounter, meaning that it must not carry a risk of toxicity, irritation, allergic response, immunogenicity, or any other complication that excessively outweighs its therapeutic benefits.
- Some examples of materials which can serve as pharmaceutically- acceptable carriers include: (1 ) sugars, such as lactose, glucose and sucrose; (2) starches, such as corn starch and potato starch; (3) cellulose, and its derivatives, such as sodium carboxymethyl cellulose, ethyl cellulose and cellulose acetate; (4) powdered tragacanth; (5) malt; (6) natural polymers such as gelatin, collagen, fibrin, fibrinogen, laminin, decorin, hyaluronan, alginate and chitosan; (7) talc; (8) excipients, such as cocoa butter and suppository waxes; (9) oils, such as peanut oil, cottonseed oil, safflower oil, sesame oil, olive oil, corn oil and soybean oil; (10) glycols, such as propylene glycol; (1 1 ) polyols, such as glycerin, sorbitol, mannitol and polyethylene glycol; (12)
- compositions may contain pharmaceutically acceptable auxiliary substances as required to approximate physiological conditions such as pH adjusting and buffering agents, toxicity adjusting agents and the like, for example, sodium acetate, sodium chloride, potassium chloride, calcium chloride, sodium lactate and the like.
- the pharmaceutically acceptable carrier is an aqueous carrier, e.g. buffered saline and the like.
- the pharmaceutically acceptable carrier is a polar solvent, e.g. acetone and alcohol.
- the concentration of CD123CAR-transduced T cells in these formulations can vary widely, and will be selected primarily based on fluid volumes, viscosities, organ size, body weight and the like in accordance with the particular mode of administration selected and the biological system's needs.
- populations of T cells transduced with a CD124CAR gene such as those described herein cells used in the methods for targeting and killing AML cells may be grown in a cell culture.
- the method may be used in an in vitro or research setting to investigate the role of CD123 in the etiology of AML, or to evaluate the targeting abilities of new CD123CAR constructs.
- CD123CAR genes and populations of T cells that are transduced with CD123CAR genes may be used in methods for treating AML in a subject. Such methods may include a step of administering a therapeutically effective amount of at least one population of T cells transduced with at least one CD123CAR gene to the subject.
- the population of CD123CAR-transduced T-cells express one or more CD123CAR genes, such as those described above.
- the T cells are transduced with and express a 32716CAR(S228P+L235E+N297Q) gene construct ( Figure 12) or a 26292CAR(S228P+L235E+N297Q) gene construct ( Figure 13).
- the transduced T cells specifically target and lyse CD123 expressing cells (i.e., AML cells) in vivo, thereby delivering their therapeutic effect of eliminating cancer cells.
- CD123CAR gene constructs having the S228P and L235E mutations in the hinge range provides sufficient protection from off-target effects to generate a sufficient response in cultured cells in vitro.
- CD123CAR(S228P+L235E) gene constructs ( Figures 10-1 1 ) which showed a highly effective anti-tumor cell effect in vitro did not have the same effects in vivo.
- CD123CAR(S228P+L235E) gene constructs administration of these constructs resulted in significant reduction of leukemic burden.
- CD123CAR gene or genes that may be used in accordance with the methods described herein may be administered, by any suitable route of administration, alone or as part of a pharmaceutical composition.
- a route of administration may refer to any administration pathway known in the art, including but not limited to intracranial, parenteral, or transdermal.
- Parenteral refers to a route of administration that is generally associated with injection, including infraorbital, infusion, intraarterial, intracapsular, intracardiac, intradermal, intramuscular, intraperitoneal,
- transduced T cells are administered intravenously or intrathecally.
- an effective amount refers to an amount of an agent, compound, treatment or therapy that produces a desired effect.
- a population of cells may be contacted with an effective amount of an agent, compound, treatment or therapy to study its effect in vitro (e.g., cell culture) or to produce a desired therapeutic effect ex vivo or in vitro.
- An effective amount of an agent, compound, treatment or therapy may be used to produce a therapeutic effect in a subject, such as preventing or treating a target condition, alleviating symptoms associated with the condition, or producing a desired physiological effect.
- the effective amount of a compound is a "therapeutically effective amount,” “therapeutically effective concentration” or “therapeutically effective dose.”
- the precise effective amount or therapeutically effective amount is an amount of the composition that will yield the most effective results in terms of efficacy of treatment in a given subject or population of cells. This amount will vary depending upon a variety of factors, including but not limited to the characteristics of the compound (including activity, pharmacokinetics, pharmacodynamics, and bioavailability), the physiological condition of the subject (including age, sex, disease type and stage, general physical condition, responsiveness to a given dosage, and type of medication) or cells, the nature of the pharmaceutically acceptable carrier or carriers in the formulation, and the route of administration. Further an effective or
- therapeutically effective amount may vary depending on whether the compound is administered alone or in combination with another compound, drug, therapy or other therapeutic method or modality.
- One skilled in the clinical and pharmacological arts will be able to determine an effective amount or therapeutically effective amount through routine experimentation, namely by monitoring a cell's or subject's response to administration of a compound and adjusting the dosage accordingly.
- Remington The Science and Practice of Pharmacy, 21 st Edition, Univ. of Sciences in Philadelphia (USIP), Lippincott Williams & Wilkins, Philadelphia, PA, 2005, which is hereby incorporated by reference as if fully set forth herein.
- Agents, compounds treatments or therapies that may be used in an effective amount or therapeutically effective amount to produce a desired effect in accordance with the embodiments described herein may include, but are not limited to, a
- CD123CAR gene an expression cassette that includes a CD123CAR gene, a vector that delivers an expression cassette that includes a CD123CAR gene to a target cell such as a T cell, and a population of T cells that are transduced with a CD123CAR gene.
- treating may refer to preventing the condition, slowing the onset or rate of development of the condition, reducing the risk of developing the condition, preventing or delaying the development of symptoms associated with the condition, reducing or ending symptoms associated with the condition, generating a complete or partial regression of the condition, or some combination thereof.
- Treatment may also mean a prophylactic or preventative treatment of a condition.
- subject refers to a human or animal, including all mammals such as primates (particularly higher primates), sheep, dog, rodents (e.g., mouse or rat), guinea pig, goat, pig, cat, rabbit, and cow. In some embodiments, the subject is a human.
- the methods for treating AML may include a step of administering a therapeutically effective amount of a first population of T cells transduced with a first CD123CAR gene in combination with a therapeutically effective amount of a second population of T cells transduced with a second
- CD123CAR-transduced T cells may be administered in combination with one or more additional anti-cancer therapies.
- “In combination” or “in combination with,” as used herein, means in the course of treating the same cancer in the same subject using two or more agents, drugs, therapeutics, procedures, treatment regimens, treatment modalities or a combination thereof, in any order. This includes simultaneous administration, as well as in a temporally spaced order of up to several days apart.
- Such combination treatment may also include more than a single administration of any one or more of the agents, drugs, therapeutics, procedures, treatment regimens, and treatment modalities. Further, the administration of the two or more agents, drugs, therapeutics, procedures, treatment regimens, treatment modalities or a combination thereof may be by the same or different routes of administration.
- Additional anti-cancer therapies may include one or more anti-cancer procedures, treatment modalities, anti-cancer therapeutics or a combination thereof.
- the CD123CAR-transduced T cells may be administered in
- the CD123CAR-transduced T cells may be administered in combination with one or more anti-cancer therapeutics or drugs that may be used to treat AML including, but not limited to, chemotherapeutics and other anti-cancer drugs, immunotherapeutics, targeted therapeutics, or a combination thereof.
- Chemotherapeutics and other anti-cancer drugs that may be administered in combination with the CD123CAR-transduced T cells in accordance with the embodiments described herein include, but are not limited to, all-trans- retinoic acid (ATRA), arsenic trioxide, anthracycline antibiotics and pharmaceutically acceptable salts thereof (e.g., doxorubicin hydrochloride, daunorubicin
- hydrochloride idarubicin, mitoxantrone
- alkylating agents e.g., cyclophosphamide, laromustine
- antimetabolite analogs cytarabine, 6-thioguanine, 6-mercaptopurine, methotrexate
- demethylating agents e.g., decitabine, 5-azacytidine
- nucleic acid synthesis inhibitors e.g., hydroxyurea
- topoisomerase inhibitors e.g., etoposide
- vinca alkaloids e.g., vincristine sulfate
- ADE which is a combination treatment that includes a combination of Cytarabine (Ara-C), Daunorubicin Hydrochloride and Etoposide).
- Immunotherapeutics that may be administered in combination with the CD123CAR-transduced T cells in accordance with the embodiments described herein include, but are not limited to, immune modulatory reagents (e.g., STAT3 inhibitors, Lenalidomide) and therapeutic monoclonal antibodies.
- immune modulatory reagents e.g., STAT3 inhibitors, Lenalidomide
- the therapeutic monoclonal antibodies may be designed (i) to target one or more AML antigens including, but not limited to, CD33 (e.g., gemtuzumab, lintuzumab), MUC1 (e.g., cantuzumab ravtansine, clivatuzumab tetraxetan, pemtumomab); (i) a B cell antigen (e.g., rituximab, ofatumumab); or a vasculature modulator such as VEGF or VEGFR (e.g., alacizumab pegol, bevacizumab, icrucumab, ramucirumab, ranibizumab).
- AML antigens including, but not limited to, CD33 (e.g., gemtuzumab, lintuzumab), MUC1 (e.g., cantuzumab ravtansine, clivat
- Targeted therapeutics that may be administered in combination with the CD123CAR-transduced T cells in accordance with the embodiments described herein include, but are not limited to, tyrosine kinase inhibitors (imatinib, dasatinib, nilotinib, sunitinib), farnesyl transferase inhibitors (e.g., tipifarnib), FLT inhibitors, and c-Kit (or CD1 17) inhibitors (imatinib, dasatinib, nilotinib).
- tyrosine kinase inhibitors imatinib, dasatinib, nilotinib, sunitinib
- farnesyl transferase inhibitors e.g., tipifarnib
- FLT inhibitors e.g., tipifarnib
- c-Kit (or CD1 17) inhibitors imatinib, dasatinib, nilotinib
- CM complete media
- PBMCs Peripheral blood mononuclear cells
- LCL-OKT3 cells express membrane bound OKT3 and are grown in CM
- K562 cells were obtained from ATCC and cultured as recommended. KG 1 a cells (kindly provided by Dr. Ravi Bhatia) were maintained in IMDM (Irvine Scientific) with 25mM HEPES, 4mM L- glutamine (Irvine Scientific), and 20% FCS. 293T cells (a kind gift from the Center for Biomedicine and Genetics at City of Hope) were maintained in DMEM + 10% heatinactivated FCS.
- Table 1 Characteristics of primary AML samples.
- aRelative Fluorescence Index is the ratio of the median of the 9F5-stained signal to isotype matched control stain in the CD34 + population
- CD123 cDNA was amplified from CD123-pMD18-T (Sino Biological Inc.) using polymerase chain reaction and primers ⁇ CD123-F: 5'-ATAAGGCCTGCCGCCACCATGGTCCTCCTTTGGCTCACG- 3' and CD123-R 5 '- ATAG CTAG CTC AAG TTTTCTG C ACG AC CTG TACTTC-3 ' ) .
- the PCR product was cloned into pMGPac using Stul and Nhel restriction sites. 293T cells were transfected using Lipofectamine 2000 (Life Technologies) per
- Lentivirus was produced by transfecting 293T cells with a lentivrial vector and the packaging vectors pCMV-Rev2, pCHGP-2, and pCMV-G using CalPhosTM mammalian cell transfection kit (Clontech). These 26292 and 32716 CAR constructs are also referred to herein as 26292CAR(S228P+L235E) or
- CFSE carboxyfluoroscein succinimidyl ester
- Target cells were labeled for 1 hour with 51 Cr (PerkinElmer), washed five times, and aliquoted in triplicate at 5 X 103 cells/well with effector cells at various effector to target (E:T) ratios. Following a 4 hour coculture, supernatants were harvested and radioactivity was measured using a gamma counter or a Topcount (PerkinElmer). Percent- specific lysis was calculated as previously described [24]. Cytokine production following a 24 hour coculture at a 10:1 E:T ratio was measured as previously described [25].
- CD107a degranulation and intracellular cytokine production T cells were cocultured with target cells at an E:T of 2:1 for six hours at 37°C in the presence of GolgiStopTM (BD Biosciences) and anti-CD107a clone H4A3 or isotype matched control antibody. At the completion of the six hour incubation, cells were harvested, washed and stained with anti-CD3, CD4, CD8, and biotinylated cetuximab followed by a secondary stain using PE-conjugated streptavidin.
- GolgiStopTM BD Biosciences
- anti-CD107a clone H4A3 or isotype matched control antibody At the completion of the six hour incubation, cells were harvested, washed and stained with anti-CD3, CD4, CD8, and biotinylated cetuximab followed by a secondary stain using PE-conjugated streptavidin.
- CD34+ cells from cord blood (CB) mononuclear cells or primary AML samples were selected using immunomagnetic column separation (Miltenyi Biotech).
- 103 CD34+ CB cells were cocultured with 25 X 103 effector cells for 4 hours prior to plating in semisolid methylcellulose progenitor culture in duplicate wells [26].
- 14 to 18 days later colonyforming unit granulocyte- macrophage (CFU-GM) and burst-forming unit erythroid (BFUE) colonies were enumerated.
- CFU-GM colonyforming unit granulocyte- macrophage
- BFUE burst-forming unit erythroid
- lentiviral vectors encoding CD123 CARs were developed.
- Each of the CARs includes codon-optimized sequences encoding one of two CD123-specific scFvs, 26292 and 32716 [1 8], respectively.
- the scFvs are fused in-frame to the human lgG4 Fc region, a CD28 costimulatory domain, and the CD3C, signaling domain.
- EGFRt truncated human EGFR
- OKT3 stimulated PBMCs from healthy donors were lenti-transduced and CAR expressing T cells were isolated by immunomagnetic selection using a biotinylated-Erbitux antibody followed by a secondary stain with anti-biotin magnetic beads. Following one REM cycle, the isolated cells were analyzed by flow cytometry for CAR surface expression and T-cell phenotype. Both Fc and EGFRt expression was greater than 90% in the generated T cell lines from three healthy donors and final T cell products consisted of a mixture of CD4 and CD8 positive T cells ( Figure 1 B, 1 C).
- CD123 CAR T cells specifically target CD123 expressing tumor cell lines
- CD123 CAR T cells To confirm the specificity of the CD123 CAR T cells, the ability of the genetically modified T cells to lyse 293T cells transiently transfected to express CD123 was examined (293T-CD123; Figure 2A). Both CD123 CAR T cells generated efficiently lysed 293T-CD123, but not 293T cells transiently transfected to express CD19, demonstrating the specific recognition of CD123 ( Figure 2B). Next, the in vitro cytolytic capacity of CD123-specific T cells was investigated against tumor cell lines endogenously expressing CD123. Expression of CD123 on the cell lines LCL and KG 1 a were confirmed by flow cytometry ( Figure 2C).
- Both CD123-specific T cell lines efficiently lysed LCL and KG 1 a target lines, but not the CD123- K562 cell line ( Figure 2C).
- Pair-matched CD19-specific T cells effectively lysed CD19+ LCL targets, but not CD19- KG1 a or K562 targets ( Figure 2D).
- Mock transduced parental cells lysed only the positive control LCL-OKT3 cell line ( Figure 2D).
- CD123 CAR T cells activate multiple effector functions when cocultured with CD123-positive target cells
- CD123 CAR T cells activate multiple effector functions when cocultured with primary AML samples
- CD107a Cell surface mobilization of CD107a was observed in both the CD4 and CD8 compartments of CD123-specific T cells while pair-matched CD19R T cells no appreciable degranulation against primary AML samples ( Figure 4A, bar graphs). Further, subpopulations of CD107a+ CD123 CAR T cells also produced either IFN- ⁇ , TNF-a, or both cytokines ( Figure 4A, pie charts). This multifunctional response was observed for both CD4 and CD8 populations ( Figure 4A and 4B). Additionally, the ability of CAR engineered T cells to proliferate in response to coculture with primary AML samples was examined. Both CD123-specific T cell lines were capable of proliferating following coculture with AML 813 or pre B-ALL 802 samples ( Figure 4C). Proliferation was observed for in both the CD4 and CD8 populations ( Figure 16). Pair-matched CD19-specific T cells proliferated when cocultured with CD19+ pre B-ALL 802, but not when cocultured with AML 813.
- CD123 CAR expressing T cells target primary AML cells in vitro
- CD123-specific T cells do not eliminate colony formation by cord blood cells in vitro
- CD123 is expressed on common myeloid progenitors (CMPs) [31 ].
- CMPs common myeloid progenitors
- Myeloid and erythroid colony formation by CB samples was not significantly reduced following a 4 hour coculture with CD123-CAR expressing T cells at an E:T of 25:1 when compared to pair-matched CD19R CAR T cells ( Figure 6 A&B).
- the ability of CD123- specific T cells to inhibit the growth of primary clonogenic AML cells was examined in vitro. Both CD123 CAR T cell lines significantly decreased the formation of leukemic colonies compared to pair-matched CD19R T cells ( Figure 6C).
- CD123- specific T cells had a greater impact on leukemic colony formation compared to normal myeloid colony formation ( Figure 6D, 69% reduction vs 31 % reduction, respectively).
- T cells from AML patients can be genetically modified to express CD123 CARs and specifically target autologous tumor cells
- AML patient derived T cells are known to poorly repolarize actin and form defective immune synapses with autologous blasts [32]. Additionally, to the best of our knowledge, CAR expressing T cells derived from AML patients have yet to be described. Therefore, it was determined whether T cells from AML patients could be genetically modified to express CD123 CARs.
- Cryopreserved PBMCs (AML 605 and AML 722) or apheresis product (AML 559) were CD3/CD28 bead stimulated, and lentivirally transduced to express either of the CD123 CARs or a CD19R control CAR.
- FIG. 7A A representative example of the phenotype of AML patient derived CAR T cells is shown in Figure 7A.
- FIG. 7B the cytolytic potential of AML patient derived CAR T cells against autologous CD34- enriched target cells was examined in a 4 hour 51 Cr release assay. All of the autologous CD34-enriched cells expressed CD123, albeit at varying percentages and intensities (Figure 7B).
- T cells derived from AML 605 and 722 efficiently lysed autologous blasts while T cells derived from AML 559 displayed low levels of autologous blast lysis likely due to the low and heterogeneous expression of CD123 on AML 559 blasts ( Figure 7C). Discussion
- the embodiments described herein include the generation of two novel CD123 targeting CARs using scFvs from recombinant immunotoxins (RITs), 26292 and 32716, which bind distinct epitopes and have similar binding affinities for CD123 [18].
- these CD123 targeting CARs redirect T cell specificity against CD123 expressing cells.
- healthy donor T cells that were engineered to express the CD123 CARs efficiently lysed CD123+ cell lines and primary AML patient samples.
- both of the CD123 CAR T cells activated multiple effector functions following coculture with CD123+ cell lines and primary AML patient samples.
- CD123-targeting T cells did not significantly reduce the number of colony-forming unit granulocyte-macrophage (CFU-GM) or burst-forming unit erythroid (BFU-E) colonies from cord blood (CB) when compared to CD19 CAR T cells.
- CD19-specific T cells had little impact on leukemic colony formation of primary AML samples
- CD123-targeting T cells significantly reduced leukemic colony formation in vitro. It was also shown that AML patient derived T cells can express CD123 CARs and lyse autologous blasts in vitro.
- T cells expressing either of the two CD123-specific CARs can specifically lyse CD123 expressing cell lines and primary AML patient samples, and activate multiple effector functions in an antigen specific manner in vitro
- both epitopes are potential targets for treatment.
- No major differences were observed between the CD123 CAR engineered T cell lines with respect to target cell killing, cytokine secretion, or proliferation when cocultured with CD123+ cells.
- One possible explanation for this is the binding affinities of the CD123-specific scFvs used in the CD123-CARs are in the nanomolar range and differ by less than 3-fold and thus offer no significant advantage in target antigen binding is conferred by either scFv [18].
- AML cells have been well documented [4, 27, 34]. Targeting some of these antigens via CAR-expressing T cells may not be feasible.
- the AML associated antigen TIM-3 is expressed on a subset of exhausted T cells [35, 36] and targeting TIM-3 using CAR- engineered T cells may result in the autolysis of genetically modified cells.
- CD47 is ubiquitously expressed [37] and thus unlikely targetable by CAR-engineered T cells.
- the CD33 differentiation antigen is predominately expressed on myeloid cells and immunotherapies targeting CD33 such as
- CD33 is expressed on a subset of T cells making it a non-ideal target for a CAR based therapy [40].
- CD33-targeting therapies was often accompanied with slow recovery of hematopoiesis and cytopenias likely the result of CD33 expression on long-term self-renewing normal hematopoietic stem cells (HSCs) [41 ].
- HSCs normal hematopoietic stem cells
- hepatotoxicities are a common side effect of CD33-targeted treatments and are possibly due to the unintended targeting of CD33+ Kupffer cells [42].
- CD123 is absent on T cells, predominantly restricted to cells of the myeloid lineage [43], and largely absent on HSCs [27]. Together, these observations made CD123 an attractive target for CAR mediated T cell therapy. Therapeutics specific for CD123 have displayed favorable safety profiles in phase I trials (ClinicalTrials.gov ID: NCT00401739 and NCT00397579) . Unfortunately, these therapies have failed to induce responses in the vast majority of treated patients.
- the CD123-CAR expressing T cells generated here displayed potent cytolytic capacity in vitro against CD123+ cell lines and primary AML samples. The studies described below show that primary samples from patients with poor-risk AML were susceptible to CD123 CAR T cell mediated cytotoxicity.
- Multifunctional T cell responses correlate with the control of virus infection and may be important in an anti-tumor CAR T cell response [44]. Indeed, patients responsive to CD19 CAR T cell therapy have detectable T cell responses (i.e. degranulation, cytokine secretion or proliferation) post-therapy in response to CD19+ targets ex vivo [1 1 , 12, 14]. In the Examples below, it was demonstrated that the functionality of CD123-CAR expressing T cells by analyzing the upregulation of CD107a, production of inflammatory cytokines and proliferation of CD123-specific T cells in response to both CD123+ cell lines and primary AML samples.
- CD123-specific T cells do not inhibit normal progenitor colony formation - even at an E:T of 25:1 .
- Expression of CD123 on lineage-CD34+CD38- cells is a hallmark of the common myeloid progenitor cell and thus a likely target of CD123 CAR T cells [31 ]. While a decrease in the relative percentage of myeloid- derived colonies was observed when CB cells were incubated with CD123-specific T cells, the decrease was not significantly less than pair-matched CD19R CAR T cells. It is possible that the limited sample size attributes to this result and further experimentation may reveal a significant decrease in CFU-GM formation in CD123 CAR T cell treated cord blood samples.
- the 4 hour coculture of T cells and CB cells prior to plating may not be a long enough time period to observe an effect on normal myeloid progenitor colony formation and that longer incubation times may decrease the number of observed myeloid derived colonies.
- CB cells using the same methodology as was used for CB cells, a substantial decrease in the number of leukemic colonies formed was observed when primary CD34-enriched AML patient samples were incubated with CD123 CAR T cells, suggesting that the 4 hour incubation time is sufficient to observe an effect between leukemic and normal colony formation.
- the lower relative expression of CD123 on CB cells compared to AML cells may in part result in the inability of CD123 CAR T cells to alter myeloid derived colony formation in vitro. While others have demonstrated that CD123 is expressed only in a small fraction of lineage-CD34+CD38- HSCs, and two phase I trials using agents targeting CD123 revealed no long term
- cryopreserved PBMCs from AML patients with active disease can be genetically modified to express CD123 CARs and exhibit potent cytolytic activity against autologous leukemic blasts in 2/3 of the samples.
- CD123 CAR T cells can distinguish between CD123+ and CD123- cells, and can activate multiple T cell effector functions against a panel of poor-risk primary AML patient samples.
- CD123-specific T cells did not significantly alter normal progenitor colony formation but considerably reduced the growth of clonogenic myeloid leukemic progenitors in vitro.
- T cells derived from AML patients can be genetically modified to express CD123- pecific CARs and lyse autologous blasts in vitro. Therefore, CD123 CAR T cells are a promising candidate for immunotherapy of AML.
- 32716CAR(S228P+L235E) constructs were generated as described in Example 1 above. Two additional CD123CAR constructs were also generated that included an additional mutation in the lgG4 hinge at position 297 (N297Q) for each scFv
- mice implanted with AML tumor cells (day 0), and were treated with 5.0x10 6 CAR+ T cells expressing either the 26292CAR(S228P+L235E) or the 26292CAR(S228P+L235E+N297Q) on day 5, and leukemic progression was monitored by bioluminescent imaging.
- leukemic burden progressed on day 8 as compared to the day of treatment in mice treated with T-cells transduced with 26292CAR(S228P+L235E), indicating that cells transduced with the CD123CAR construct having hinge region mutations at positions S228P and L235E had no effect in vivo.
- 26292CAR(S228P+L235E+N297Q) showed a reduction in tumor size as compared to the day of treatment, indicating that the addition of a hinge region mutation at position 297 (N297Q) results in a CD123CAR construct that is able to delay leukemic progression in vivo.
- TIM-3 is a promising target to selectively kill acute myeloid leukemia stem cells.
- T-cell clones can be rendered specific for CD19: toward the selective augmentation of the graft-versus-B-lineage leukemia effect. Blood, 2003. 101 (4): p. 1637-44.
- T cells with chimeric antigen receptors have potent antitumor effects and can establish memory in patients with advanced Leukemia. Sci Transl Med, 201 1 . 3(95): p. 95ra73.
- the interleukin-3 receptor alpha chain is a unique marker for human acute myelogenous leukemia stem cells. Leukemia, 2000. 14(10): p. 1777-84.
- Tim-3 is overexpressed on T cells in hepatitis C virus infection and its blockade rescues dysfunctional CD4+ and CD8+ T cells. J Virol, 2009. 83(18): p. 9122-30. 36. Jin, H.T., et al., Cooperation of Tim-3 and PD-1 in CD8 T-cell exhaustion during chronic viral infection. Proc Natl Acad Sci U S A, 2010. 107(33): p. 14733-8.
- T lymphocytes can be effectively recruited for ex vivo and in vivo lysis of AML blasts by a novel CD33/CD3-bispecific BiTE((R)) antibody construct.
- Leukemia 2012.
Abstract
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