Patent Application
20240150428
This application contains a Sequence Listing which has been submitted electronically in an XML computer readable format (CRF), and is hereby incorporated herein by reference in its entirety. Said Sequence Listing XML was created on Jan. 25, 2024, is named 047563_765089_Replacement_SL.xml and is 759,213 bytes in size.
Disclosed herein are genome-edited invariant natural killer T (iNKT) cells and methods of immunotherapy using them. In particular, the disclosure relates to engineered chimeric antigen receptor (CAR)-bearing INKT cells (CAR-iNKTs) and methods of using the same for the treatment of cancer.
Chimeric antigen receptor T cell (CAR-T) immunotherapy is increasingly well known. T cells are genetically modified to express chimeric antigen receptors (CARs), which are fusion proteins comprised of an antigen recognition moiety and T cell activation domains. The CARs are designed to recognize antigens that are overexpressed on cancer cells. CAR-Ts demonstrate exceptional clinical efficacy against B cell malignancies, and two therapies, Kymriah™ (tisagenlecleucel, Novartis) and Yescarta™ (axicabtagene ciiloleucel, Kite/Gilead), were recently approved by the FDA. However, broad applicability of CAR-T therapy has been limited in two ways. First, the development of CAR-T cell therapy against T cell malignancies has proven problematic, in part due to the shared expression of target antigens between malignant T cells and effector T cells, because expression of target antigens on CAR-T cells may induce fratricide of CAR-T cells and loss of efficacy. Second, the use of T-cells other than an individual patient's own (allogenic) in CAR-T therapy may lead to allogenic reactivity including graft-versus-host disease.
Invariant natural killer T cells, also called iNKT cells or type-I NKT cells, represent a distinct lymphocyte population, characterized by expression of an invariant T cell receptor α-chain and certain TCR β-chains (Vα24-Jα18 combined with Vβ11). iNKT TCR-mediated responses are restricted by CD1d, a member of the non-polymorphic CD1 antigen presenting protein family, which promotes the presentation of endogenous and pathogen-derived lipid antigens to the TCR. The prototypical ligand for invariant receptor is α-Galactosylceramide (αGalCer). Upon binding of the invariant TCR to CD1d-αGalCer, iNKT will expand. The CD1d gene is monomorphic and expressed by only a few cell types, limiting the potential toxicity of NKT cells in the autologous or allogeneic settings.
The following disclosure will detail embodiments, alternatives, and uses of engineered iNKT cells such as genome-edited iNKT cells, CAR-iNKT cells, dual-CAR iNKT cells, and tandem-CAR iNKT cells, as well as the uses of such cells in, for example immunotherapy and adoptive cell transfer for the treatment of diseases. Accordingly, provided herein are the following embodiments.
Disclosed herein are genome-edited invariant natural killer T (iNKT) cells.
Also provided is a population of genome-edited iNKT cells from multiple donors that can be maintained or expanded for at least three weeks without being frozen.
Also provided is an iNKT cell, which comprises at least one chimeric antigen receptor (CAR) targeting one or more antigens, and which is deficient in an antigen to which the CAR specifically binds.
In certain embodiments, the chimeric antigen receptor specifically binds at least one antigen expressed on a malignant T cell.
In certain embodiments, the antigen is selected from BCMA, CS1, CD38, CD138, CD19, CD33, CD123, CD371, CD117, CD135, Tim-3, CD5, CD7, CD2, CD4, CD3, CD79A, CD79B, APRIL, CD56, and CD1a.
In certain embodiments, the chimeric antigen receptor specifically binds at least one antigen expressed on a malignant plasma cell.
In certain embodiments, the antigen is selected from BCMA, CS1, CD38, and CD19.
In certain embodiments, the chimeric antigen receptor(s) specifically binds at least one antigen expressed on a malignant B cell.
In certain embodiments, the antigen expressed on a malignant B cell is chosen from CD19, CD20, CD21, CD22, CD23, CD24, CD25, CD27, CD38, and CD45.
In certain embodiments, the antigen expressed on a malignant B cell is chosen from CD19 and CD20.
In certain embodiments, the chimeric antigen receptor expresses the extracellular portion of the APRIL protein, the ligand for BCMA and TACI, effectively co-targeting both BCMA and TACI.
In certain embodiments, the iNKT cell further comprises a suicide gene.
In certain embodiments, endogenous T cell receptor mediated signaling is blocked in the iNKT cell.
In certain embodiments, the iNKT cells do not induce alloreactivity or graft-versus-host disease.
In certain embodiments, the iNKT cells do not induce fratricide.
Also provided is a dual or tandem iNKT-CAR cell.
Also provided is a therapeutic composition comprising the population of iNKT cells as disclosed herein, and at least one therapeutically acceptable carrier and/or adjuvant.
In certain embodiments, the composition comprises at least one adjuvant chosen from IL-7, IL-15, IL-2, or an analogue of any of the foregoing.
In certain embodiments, the composition comprises IL-2.
In certain embodiments, the composition comprises a combination of any two or more of IL-7, IL-15, IL-2, or an analogue of any of the foregoing.
In certain embodiments, the composition comprises IL-7, IL-15, and IL-2.
Also provided is a method of treatment of a hematologic malignancy in a patient comprising administering genome-edited iNKT cell, population of genome-edited iNKT cells, dual iNKT-CAR cell, or tandem iNKT-CAR cell as disclosed herein, or the therapeutic composition as disclosed herein to a patient in need thereof.
In certain embodiments, the hematologic malignancy is a T-cell malignancy.
In certain embodiments, the T cell malignancy is T-cell acute lymphoblastic leukemia (T-ALL).
In certain embodiments, the T cell malignancy is non-Hodgkins lymphoma.
In certain embodiments, the hematologic malignancy is multiple myeloma.
Also provided is a method of making a gene-edited iNKT cell comprising the steps of:
In certain embodiments, the method includes the step of transducing the iNKT cell with a chimeric antigen receptor that recognizes one or more antigen or cell surface protein targets.
In certain embodiments, the antigen that is the target of the CAR is deleted from the cell.
Also provided is a method of making a population of genome-edited iNKT cells from multiple donors comprising the steps of:
Other embodiments are disclosed below.
Genome-Edited iNKT Cells and iNKT-CARs
Fratricide Resistance. iNKT cells disclosed herein may be deficient in an antigen to which the chimeric antigen receptor specifically binds and are therefore fratricide-resistant. In some embodiments, the antigen of the iNKT cell is modified such that the chimeric antigen receptor no longer specifically binds the modified antigen. For example, the epitope of the antigen recognized by the chimeric antigen receptor may be modified by one or more amino acid changes (e.g., substitutions or deletions) or the epitope may be deleted from the antigen. In other embodiments, expression of the antigen is reduced in the iNKT cell by at least 50%, at least 60%, at least 70%, at least 80%, at least 90% or more. Methods for decreasing the expression of a protein are known in the art and include, but are not limited to, modifying or replacing the promoter operably linked to the nucleic acid sequence encoding the protein. In still other embodiments, the T iNKT cell is modified such that the antigen is not expressed, e.g., by deletion or disruption of the gene encoding the antigen. In each of the above embodiments, the iNKT cell may be deficient in one or preferably all the antigens to which the chimeric antigen receptor specifically binds. Methods for genetically modifying an iNKT cell to be deficient in an antigen are well known in art, and non-limiting examples are provided above. In an exemplary embodiment, CRISPR/cas9 gene editing can be used to modify an iNKT cell to be deficient in an antigen, for example as described below. Alternatively, TALENs may be used to edit genes.
In an variation of the method above, a construct encoding one or more protein expression blocker (PEBL) may be transduced into the cell, either as the editing step or part of the editing step, or as part of CAR transduction. For example, an construct encoding an antibody-derived single-chain variable fragment specific for CD3c may be transduced, e.g. by a lentiviral vector. Once expressed, the PEBL colocalizes intracellularly with CD3ε, blocking surface CD3 and TCRαβ expression. Accordingly, PEBL blockade of surface CD3/TCRαβ expression is an alternative method of preparing allogeneic CAR-T cells. Furthermore, PEBL and CAR expression can be combined in a single construct. Either of these methods may be achieved using the methods disclosed herein, and PEBLs may be produced for blockade of any of the targets of gene suppression disclosed herein.
The methods described above may be adapted to insert a CAR into a locus for a gene encoding an antigen, cell surface protein, or secretable protein, such as a cytokine. In this way, editing of the genome is effected by transfection of CAR. Thereafter, cells may be activated as described herein, removing separate genome editing step in certain embodiments. Ideally, such a step should be performed while cells are actively dividing. Such methods are also expected to result in robust expansion of engineered cells.
In certain circumstances, an iNKT cell may be selected for deficiency in the antigen to which the chimeric antigen receptor specifically binds. Certain iNKT cells will produce and display less of a given surface protein; instead if deleting or non-functionalizing the antigen that will be the target of the iNKT-CAR, the iNKT cell can be selected for deficiency in the antigen, and the population of antigen-deficient cells expanded for transduction of the CAR. Such a cell would also be fratricide-resistant.
CAR Antigens. Suitable antigens to be genome-edited in the iNKT cells disclosed herein, and to be recognized by the CARs of iNKT-CARs disclosed herein, include antigens specific to hematologic malignancies. These can include T cell-specific antigens and/or antigens that are not specific to T cells. The antigen may be specifically bound by the chimeric antigen receptor of an iNKT-CARs cell, and the antigen for which the iNKT-CARs cell is deficient, is an antigen expressed on a malignant T cell, preferably an antigen that is overexpressed on malignant T cell (i.e., a T cell derived from a T-cell malignancy) in comparison to a nonmalignant T cell. Examples of such antigens include BCMA, CS1, CD38, CD138, CD19, CD33, CD123, CD371, CD117, CD135, Tim-3, CD5, CD7, CD2, CD4, CD3ε, CD79A, CD79B, APRIL, CD56, and CD1a, TRAC, and TCRβ.
T-cell malignancies comprise malignancies derived from T-cell precursors, mature T cells, or natural killer cells. Examples of T-cell malignancies include T-cell acute lymphoblastic leukemia/lymphoma (T-ALL), T-cell large granular lymphocyte (LGL) leukemia, human T-cell leukemia virus type 1-positive (HTLV-1+)adult T-cell leukemia/lymphoma (ATL), T-cell prolymphocytic leukemia (T-PLL), and various peripheral T-cell lymphomas (PTCLs), including but not limited to angioimmunoblastic T-cell lymphoma (AITL), ALK-positive anaplastic large cell lymphoma, and ALK-negative anaplastic large cell lymphoma.
Suitable CAR antigens can also include antigens found on the surface of a multiple myeloma cell, i.e., a malignant plasma cell, such as BCMA, CS1, CD38, and CD19. Alternatively, the CAR may be designed to express the extracellular portion of the APRIL protein, the ligand for BCMA and TACI, effectively co-targeting both BCMA and TACI for the treatment of multiple myeloma.
Additional examples of suitable antigens to be genome-edited in the iNKT cells disclosed herein, and to be recognized by the CARs of iNKT-CARs disclosed herein, are given below in Tables 4, 5, 11. These include BCMA, CS1, CD38, CD138, CD19, CD33, CD123, CD371, CD117, CD135, Tim-3, CD5, CD7, CD2, CD4, CD3ε, CD79A, CD79B, APRIL, CD56, and CD1a, CD2, CD3ε, CD4, CD5, CD7, TRAC, and TCRβ.
Suicide Genes. Alternatively, or in addition, genome-edited iNKT cells may further comprise one or more suicide genes. As used herein, “suicide gene” refers to a nucleic acid sequence introduced into an iNKT cell by standard methods known in the art that, when activated, results in the death of the iNKT cell. Suicide genes may facilitate effective tracking and elimination of the iNKT cells in vivo if required. Facilitated killing by activating the suicide gene may occur by methods known in the art. Suitable suicide gene therapy systems known in the art include, but are not limited to, various the herpes simplex virus thymidine kinase (HSVtk)/ganciclovir (GCV) suicide gene therapy systems or inducible caspase 9 protein. In an exemplary embodiment, a suicide gene is a CD34/thymidine kinase chimeric suicide gene.
Methods of CAR and iNKT-CAR Construction
A “chimeric antigen receptor (CAR),” as used herein and generally used in the art, refers to a recombinant fusion protein that has an antigen-specific extracellular domain (antigen recognition domain) coupled to an intracellular domain (signaling domain) that directs the cell to perform a specialized function upon binding of an antigen to the extracellular domain. Chimeric antigen receptors are distinguished from other antigen binding agents by their ability to both bind MHC-independent antigen and transduce activation signals via their intracellular domain.
Methods for CAR design, delivery and expression, and the manufacturing of clinical-grade iNKT cell populations are known in the art. See, for example, Lee et al., Clin. Cancer Res., 2012, 18(10): 2780-90. An engineered chimeric antigen receptor polynucleotide that encodes for a CAR comprises: a signal peptide, an extracellular ligand-binding domain, i.e., an antigen-recognition domain, a transmembrane domain, and a signaling transducing domain.
The extracellular ligand-binding domain of a chimeric antigen receptor recognizes and specifically binds an antigen, typically a surface-expressed antigen of a malignancy. An “antigen-specific extracellular domain” (or, equivalently, “antigen-binding domain”) specifically binds an antigen when, for example, it binds the antigen with an affinity constant or affinity of interaction (KD) between about 0.1 pM to about 10 pM, preferably about 0.1 pM to about 1 pM, more preferably about 0.1 pM to about 100 nM. Methods for determining the affinity of interaction are known in the art. An extracellular ligand-binding domain suitable for use in a CAR of the present disclosure may be any antigen-binding polypeptide, a wide variety of which are known in the art. In some instances, the antigen-binding domain is a single chain Fv (scFv). Other antibody-based recognition domains (cAb VHH (camelid antibody variable domains) and humanized versions thereof, IgNAR VH (shark antibody variable domains) and humanized versions thereof, sdAb VH (single domain antibody variable domains) and “camelized” antibody variable domains are suitable for use. In some instances, T-cell receptor (TCR) based recognition domains such as single chain TCR (scTv, single chain two-domain TCR containing VαVβ) are also suitable for use.
A chimeric antigen receptor of the present disclosure also comprises an “intracellular domain” that provides an intracellular signal to the iNKT cell upon antigen binding to the antigen-specific extracellular domain. The intracellular signaling domain of a chimeric antigen receptor of the present disclosure is responsible for activation of at least one of the effector functions of the iNKT cell in which the chimeric receptor is expressed. The term “effector function” refers to a specialized function of a differentiated cell, such as an iNKT cell. An effector function of an iNKT cell, for example, may be NK transactivation, T cell activation and differentiation, B cell activation, dendritic cell activation and cross-presentation activity, and macrophage activation. Thus, the term “intracellular domain” refers to the portion of a CAR that transduces the effector function signal upon binding of an antigen to the extracellular domain and directs the iNKT cell to perform a specialized function. Non-limiting examples of suitable intracellular domains include the zeta chain of the T-cell receptor or any of its homologs (e.g., eta, delta, gamma, or epsilon) and combinations of signaling molecules, such as CD3 and CD28, CD27, 4-1 BB, DAP-1 0, OX40, and combinations thereof, as well as other similar molecules and fragments. Intracellular signaling portions of other members of the families of activating proteins may be used, such as FcγRIII and FcεRI. While usually the entire intracellular domain will be employed, in many cases it will not be necessary to use the entire intracellular polypeptide. To the extent that a truncated portion of the intracellular signaling domain may find use, such truncated portion may be used in place of the intact chain as long as it still transduces the effector function signal. The term intracellular domain is thus meant to include any truncated portion of the intracellular domain sufficient to transduce the effector function signal.
Typically, the antigen-specific extracellular domain is linked to the intracellular domain of the chimeric antigen receptor by a “transmembrane domain.” A transmembrane domain traverses the cell membrane, anchors the CAR to the T cell surface, and connects the extracellular domain to the intracellular signaling domain, thus impacting expression of the CAR on the T cell surface. Chimeric antigen receptors may also further comprise one or more costimulatory domain and/or one or more spacer. A “costimulatory domain” is derived from the intracellular signaling domains of costimulatory proteins that enhance cytokine production, proliferation, cytotoxicity, and/or persistence in vivo. A “peptide hinge” connects the antigen-specific extracellular domain to the transmembrane domain. The transmembrane domain is fused to the costimulatory domain, optionally a costimulatory domain is fused to a second costimulatory domain, and the costimulatory domain is fused to a signaling domain, not limited to CD3ζ. For example, inclusion of a spacer domain between the antigen-specific extracellular domain and the transmembrane domain, and between multiple scFvs in the case of tandem CAR, may affect flexibility of the antigen-binding domain(s) and thereby CAR function. Suitable transmembrane domains, costimulatory domains, and spacers are known in the art.
Mono iNKT-CAR Cells (miNKT)
In certain embodiments, the disclosure provides an engineered iNKT cell comprising a single CAR, that specifically binds CD7, wherein the iNKT cell is deficient in CD7 (e.g., CD7-iNKT-CAR□CD7 cell). In non-limiting examples, the deficiency in CD7 resulted from (a) modification of CD7 expressed by the iNKT cell such that the chimeric antigen receptors no longer specifically binds the modified CD7, (b) modification of the iNKT cell such that expression of CD7 is reduced in the iNKT cell by at least 50%, at least 60%, at least 70%, at least 80%, at least 90% or more, or (c) modification of the iNKT cell such that CD7 is not expressed (e.g., by deletion or disruption of the gene encoding CD7. In further embodiments, the iNKT cell comprises a suicide gene. In non-limiting examples the suicide gene expressed in the CD7-iNKT-CAR□CD7 cells encodes a modified Human-Herpes Simplex Virus-1-thymidine kinase (TK) gene fused in-frame to the extracellular and transmembrane domains of the human CD34 cDNA.
The CAR for a CD7 specific iNKT-CAR cell may be generated by cloning a commercially synthesized anti-CD7 single chain variable fragment (scFv) into a 3rd generation CAR backbone with CD28 and 4-1BB internal signaling domains. An extracellular hCD34 domain may be added after a P2A peptide to enable both detection of CAR following viral transduction and purification using anti-hCD34 magnetic beads. A similar method may be followed for making CARs specific for other malignant T cell antigens.
Disclosed are embodiments of CAR amino acid sequences that can be expressed on the surface of a genome-edited iNKT cell derived from an iNKT cell.
In a similar manner, other mono-iNKT cells may be constructed and are given below in Table 4.
Tandem iNKT-CAR Cells
In certain embodiments, the disclosure provides an engineered iNKT cell comprising a tandem CAR (tCAR), i.e., two scFv sharing a single intracellular domain, that specifically binds CD7 and CD2, wherein the iNKT cell is deficient in CD7 and CD2 (e.g., CD7xCD2-iNKT-tCAR□CD7□CD2 cell). In non-limiting examples, the deficiency in CD7 and CD2 resulted from (a) modification of CD7 and CD2 expressed by the iNKT cell such that the chimeric antigen receptors no longer specifically binds the modified CD7 or CD2, (b) modification of the iNKT cell such that expression of CD7 and CD2 is reduced in the iNKT cell by at least 50%, at least 60%, at least 70%, at least 80%, at least 90% or more, or (c) modification of the iNKT cell such that CD7 and CD2 is not expressed (e.g., by deletion or disruption of the gene encoding CD7 and/or CD2. In further embodiments, the iNKT cell comprises a suicide gene. In non-limiting examples the suicide gene expressed in the CD7*CD2-iNKT-tCAR□CD7□CD2 cells encodes a modified Human-Herpes Simplex Virus-1-thymidine kinase (TK) gene fused in-frame to the extracellular and transmembrane domains of the human CD34 cDNA.
A tCAR for a genome-edited, tandem iNKT-CAR cell, i.e., CD7*CD2-iNKT-tCAR□CD7□CD2, may be generated by cloning a commercially synthesized anti-CD7 single chain variable fragment (scFv) and an anti-CD2 single chain variable fragment (scFv) into a 3rd generation CAR backbone with CD28 and 4-1BB internal signaling domains. An extracellular hCD34 domain may be added after a P2A peptide to enable both detection of CAR following viral transduction and purification using anti-hCD34 magnetic beads. A similar method may be followed for making tCARs specific for other malignant T cell antigens.
In one embodiment of a linear tandem CAR construct, the first extracellular ligand-binding domain comprises a single chain antibody fragment (scFv), comprising the heavy (VH) and the light (VL) variable fragment, designated VH1 and VL1, and joined by a linker (e.g., GGGGS) 2-6 (SEQ ID NO:447). The second extracellular ligand-binding domain antigen recognition comprises a single chain antibody fragment (scFv), comprising the light (VL) and the heavy (VH) variable fragment, designated VL2 and VH2, and joined by a linker (e.g., GGGGS)2-6 (SEQ ID NO:447).
In a second embodiment of a linear tandem CAR construct, the first extracellular ligand-binding domain comprises a single chain antibody fragment (scFv), comprising the heavy (VH) and the light (VL) variable fragment, designated VH2 and VL2, and joined by a linker (e.g., GGGGS)2-6 (SEQ ID NO:447). The second extracellular ligand-binding domain antigen recognition comprises a single chain antibody fragment (scFv), comprising the light (VL) and the heavy (VH) variable fragment, designated VL1 and VH1, and joined by a linker (e.g., GGGGS)2-6 (SEQ ID NO:447).
In a third embodiment of a linear tandem CAR construct, the first extracellular ligand-binding domain comprises a single chain antibody fragment (scFv), comprising the heavy (VL) and the light (VH) variable fragment, designated VL1 and VH1, and joined by a linker (e.g., GGGGS)2-6 (SEQ ID NO:447). The second extracellular ligand-binding domain antigen recognition comprises a single chain antibody fragment (scFv), comprising the light (VH) and the heavy (VL) variable fragment, designated VH2 and VL2, and joined by a linker (e.g., GGGGS)2-6 (SEQ ID NO:447).
In a fourth embodiment of a linear tandem CAR construct, the first extracellular ligand-binding domain comprises a single chain antibody fragment (scFv), comprising the heavy (VL) and the light (VH) variable fragment, designated VL2 and VH2, and joined by a linker (e.g., GGGGS)2-6 (SEQ ID NO:447). The second extracellular ligand-binding domain antigen recognition comprises a single chain antibody fragment (scFv), comprising the light (VH) and the heavy (VL) variable fragment, designated VH1 and VL1, and joined by a linker (e.g., GGGGS)2-6 (SEQ ID NO:447).
For each of the linear tandem CAR construct embodiments, the first and second extracellular ligand-binding domains targets a surface molecule, i.e., an antigen expressed on a malignant T cell is selected from, but not limited to, BCMA, CS1, CD38, CD138, CD19, CD33, CD123, CD371, CD117, CD135, Tim-3, CD5, CD7, CD2, CD4, CD3ε, CD79A, CD79B, APRIL, CD56, and CD1a, TRAC, and TCRβ.
Further examples of linear tandem CAR are given below in Table 5.
For example, provided herein are linear tandem CAR constructs which may incorporate the VH and VL domains of scFvs targeting any of the antigen pairs provided in the Examples in Table 5 above.
Hairpin Tandem CAR Constructs
In one embodiment of a hairpin tandem CAR construct, the first extracellular ligand-binding domain comprises a single chain antibody fragment (scFv), comprising two heavy chain variable fragments, designated VH1 and VH2, and joined by a linker (e.g., GGGGS)2-6 (SEQ ID NO:447). The second extracellular ligand-binding domain antigen recognition comprises a single chain antibody fragment (scFv), comprising two light chain variable fragments, designated VL2 and VL1, and joined by a linker (e.g., GGGGS)2-6 (SEQ ID NO:447).
In a second embodiment of a hairpin tandem CAR construct, the first extracellular ligand-binding domain comprises a single chain antibody fragment (scFv), comprising two heavy chain variable fragments, designated VH2 and VH1, and joined by a linker (e.g., GGGGS)2-6 (SEQ ID NO:447). The second extracellular ligand-binding domain antigen recognition comprises a single chain antibody fragment (scFv), comprising two light chain variable fragments, designated VL1 and VL2, and joined by a linker (e.g., GGGGS)2-6 (SEQ ID NO:447).
In a third embodiment of a hairpin tandem CAR construct, the first extracellular ligand-binding domain comprises a single chain antibody fragment (scFv), comprising two light chain variable fragments, designated VL1 and VL2, and joined by a linker (e.g., GGGGS)2-6 (SEQ ID NO:447). The second extracellular ligand-binding domain antigen recognition comprises a single chain antibody fragment (scFv), comprising two heavy chain variable fragments, designated VH2 and VH1, and joined by a linker (e.g., GGGGS)2-6 (SEQ ID NO:447).
In a fourth embodiment of a hairpin tandem CAR construct, the first extracellular ligand-binding domain comprises a single chain antibody fragment (scFv), comprising two light chain variable fragments, designated VL2 and VL1, and joined by a linker (e.g., GGGGS)2-6 (SEQ ID NO:447). The second extracellular ligand-binding domain antigen recognition comprises a single chain antibody fragment (scFv), comprising two heavy chain variable fragments, designated VH1 and VH2, and joined by a linker (e.g., GGGGS)2-6 (SEQ ID NO:447).
For each of the hairpin tandem CAR construct embodiments, the first and second extracellular ligand-binding domains targets a surface molecule, i.e., an antigen expressed on a malignant T cell is selected from, but not limited to, BCMA, CS1, CD38, CD138, CD19, CD33, CD123, CD371, CD117, CD135, Tim-3, CD5, CD7, CD2, CD4, CD3ε, CD79A, CD79B, APRIL, CD56, and CD1a, TRAC, and TCRβ.
Additional examples of hairpin tandem CARs are given above in Table 5.
Furthermore, provided herein are CAR constructs and iNKT cells which may incorporate the VH and VL domains of scFvs targeting (1) CD2 and CD3; and (2) CD2 and CD7 and are provided below in Table 7.
Additionally, provided herein are hairpin tandem CAR constructs which may incorporate VH and VL domains of scFvs targeting any of the antigen pairs provided in Table 5.
For example, provided herein in Table 9 are hairpin tandem CAR constructs which incorporate the VH and VL domains of CD2 and CD3 scFvs.
Also provided herein in Table 10 are hairpin tandem CAR constructs with a (Cys=Cys) double-stranded bond (DSB) which may incorporate the VH and VL domains of scFvs targeting any of the antigen pairs provided in Table 5.
Dual iNKT-CAR Cells
In certain embodiments, the disclosure provides an engineered iNKT cell comprising a dual CAR (dCAR), i.e., two CARs expressed from a single lentivirus construct, that specifically binds CD7 and CD2, wherein the iNKT cell is deficient in CD7 and CD2 (e.g., CD7xCD2-iNKT-dCAR□CD7□CD2 cell). In non-limiting examples, the deficiency in CD7 and CD2 resulted from (a) modification of CD7 and CD2 expressed by the iNKT cell such that the chimeric antigen receptors no longer specifically binds the modified CD7 or CD2, (b) modification of the iNKT cell such that expression of CD7 and CD2 is reduced in the iNKT cell by at least 50%, at least 60%, at least 70%, at least 80%, at least 90% or more, or (c) modification of the iNKT cell such that CD7 and CD2 is not expressed (e.g., by deletion or disruption of the gene encoding CD7 and/or CD2. In further embodiments, the iNKT cell comprises a suicide gene. In non-limiting examples the suicide gene expressed in the CD7*CD2-iNKT-dCAR□CD7□CD2 cells encodes a modified Human-Herpes Simplex Virus-1-thymidine kinase (TK) gene fused in-frame to the extracellular and transmembrane domains of the human CD34 cDNA.
In a similar manner, other dual iNKT-CARs may be constructed, and are given below in Table 11.
In a further aspect, an iNKT-CAR cell to be used as a control in certain circumstances may be created. For example, when designing iNKT-CARs binding T-cell antigens, the control iNKT-CAR may include an extracellular domain that binds to an antigen not expressed on a malignant T-cell. The antigen that the control iNKT-CAR cell binds to may be, e.g., CD19. CD19 is an antigen expressed on B cells but not on T cells, so an iNKT-CAR with an extracellular domain adapted to bind to CD19 will not bind to T cells. These iNKT-CARs may be called iNKT-CAR19 cells. These control iNKT-CAR cells may be used as controls to analyze the binding efficiencies and non-specific binding of iNKT-CAR cells targeted to the cancer of interest and/or recognizing the antigen of interest.
CARs may be further designed as disclosed in WO2018027036A1, optionally employing variations which will be known to those of skill in the art. Lentiviral vectors and cell lines can be obtained, and guide RNAs designed, validated, and synthesized, as disclosed therein as well as by methods known in the art and from commercial sources.
Engineered CARs may be introduced into iNKT cells using retroviruses, which efficiently and stably integrate a nucleic acid sequence encoding the chimeric antigen receptor into the target cell genome. Other methods known in the art include, but are not limited to, lentiviral transduction, transposon-based systems, direct RNA transfection, and CRISPR/Cas systems (e.g., type I, type II, or type III systems using a suitable Cas protein such Cas3, Cas4, Cas5, Cas5e (or CasD), Cas6, Cas6e, Cas6f, Cas7, Cas8a1, Cas8a2, Cas8b, Cas8c, Cas9, Cas10, Casl Od, CasF, CasG, CasH, Csy1, Csy2, Csy3, Cse1 (or CasA), Cse2 (or CasB), Cse3 (or CasE), Cse4 (or CasC), Csc1, Csc2, Csa5, Csn2, Csm2, Csm3, Csm4, Csm5, Csm6, Cmr1, Cmr3, Cmr4, Cmr5, Cmr6, Csb1, Csb2, Csb3, Csx17, Csx14, Csx1 0, Csx16, CsaX, Csx3, Csz1, Csx15, Csf1, Csf2, Csf3, Csf4, and Cu1966, etc.). Zinc finger nucleases (ZFNs) and transcription activator-like effector nucleases (TALENs) may also be used. See, e.g., Shearer RF and Saunders DN, “Experimental design for stable genetic manipulation in mammalian cell lines: lentivirus and alternatives,” Genes Cells 2015 January; 20(1):1-10.
In addition to gene-editing the TCR and cell surface proteins and antigens, genes for secretable proteins such as cytokines and chemokines may be edited. Such editing would be done, e.g., to reduce or prevent the development or maintenance of cytokine release syndrome (CRS). CRS is caused by a large, rapid release of cytokines from immune cells in response to immunotherapy (or other immunological stimulus). Modifying, disrupting, or deleting one or more cytokine or chemokine genes can be accomplished using the methods known in the art, such as genetic ablation (gene silencing) in which gene expression is abolished through the alteration or deletion of genetic sequence information. This can be accomplished using known genetic engineering tools in the art, such as Transcription Activator-like Effector Nucleases (TALENs), Zinc Finger Nucleases (ZFNs), CRISPR, by transduction of small hairpin RNAs (shRNAs), by targeted transduction of a CAR into the gene sequence of the cytokine, and the like.
Cytokines or chemokines that can be deleted from immune effector cells as disclosed herein, e.g., using Cas9-CRISPR or by targeted transduction of a CAR into the gene sequence of the cytokine, include without limitation the following: XCL1, XCL2, CCL1, CCL2, CCL3, CCL4, CCL5, CCL7, CCL8, CCL11, CCL13, CCL14, CCL15, CCL16, CCL17, CCL18, CCL19, CCL20, CCL21, CCL22, CCL23, CCL24, CCL25, CCL26, CCL27, CXCL1, CXCL2, CXCL3, CXCL4, CXCL5, CXCL6, CXCL7, CXCL8, CXCL9, CXCL10, CXCL11, CXCL12, CXCL13, CXCL14, CX3CL1, IL-1α, IL-1β, IL-1RA, IL-18, IL-2, IL-4, IL-7, IL-9, IL-13, IL-15, IL-3, IL-5, GM-CSF, IL-6, IL-11, G-CSF, IL-12, LIF, OSM, IL-10, IL-20, IL-14, IL-16, IL-17, IFN-α, IFN-β, IFN-γ, CD154, LT-β, TNF-α, TNF-β, 4-1BBL, APRIL, CD70, CD153, CD178, GITRL, LIGHT, OX40L, TALL-1, TRAIL, TWEAK, TRANCE, TGF-β1, TGF-β2, TGF-β3, Epo, Tpo, Flt-3L, SCF, M-CSF, MSP, A2M, ACKR1, ACKR2, ACKR3, ACVR1, ACVR2B, ACVRL1, ADIPOQ, AGER, AGRN, AIMP1, AREG, BMP1, BMP10, BMP15, BMP2, BMP3, BMP4, BMP5, BMP6, BMP7, BMP8A, BMP8B, BMPR2, C10orf99, C1QTNF4, C5, CCL28, CCR1, CCR2, CCR3, CCR5, CCR6, CCR7, CD109, CD36, CD4, CD40LG, CD74, CER1, CHRD, CKLF, CLCF1, CMTM1, CMTM2, CMTM3, CMTM4, CMTM5, CMTM6, CMTM7, CMTM8, CNTF, CNTFR, COPS5, CRLF1, CSF1, CSF1R, CSF2, CSF3, CSF3R, CTF1, CX3CR1, CXCL16, CXCL17, CXCR1, CXCR2, CXCR3, CXCR4, CXCR6, EBI3, EDN1, ELANE, ENG, FAM3B, FAM3C, FAM3D, FAS, FASLG, FGF2, FLT3LG, FZD4, GBP1, GDF1, GDF10, GDF11, GDF15, GDF2, GDF3, GDF5, GDF6, GDF7, GDF9, GPI, GREM1, GREM2, GRN, HAX1, HFE2, HMGB1, HYAL2, IFNA10, IFNA14, IFNA16, IFNA2, IFNA5, IFNA6, IFNA8, IFNAR1, IFNAR2, IFNB1, IFNE, IFNG, IFNGR1, IFNK, IFNL1, IFNL3, IFNW1, IL10RA, IL11RA, IL12A, IL12B, IL12RB1, IL17A, IL17B, IL17C, IL17D, IL17F, IL18BP, IL-19, IL1F10, IL1R1, IL1R2, IL1RAPL1, IL1RL1, URN, IL20RA, IL20RB, IL21, IL22, IL22RA1, IL22RA2, IL23A, IL23R, IL24, IL25, IL26, IL27, IL2RA, IL2RB, IL2RG, IL31, IL31RA, IL32, IL33, IL34, IL36A, IL36B, IL36G, IL36RN, IL37, IL6R, IL6ST, INHA, INHBA, INHBB, INHBC, INHBE, ITGA4, ITGAV, ITGB1, ITGB3, KIT, KITLG, KLHL20, LEFTY1, LEFTY2, LIFR, LTA, LTB, LTBP1, LTBP3, LTBP4, MIF, MINOS1-, MSTN, NAMPT, NBL1, NDP, NLRP7, NODAL, NOG, NRG1, NRP1, NRP2, OSMR, PARK7, PDPN, PF4, PF4V1, PGLYRP1, PLP2, PPBP, PXDN, SCG2, SCGB3A1, SECTM1, SLURP1, SOSTDC1, SP100, SPP1, TCAP, TGFBR1, TGFBR2, TGFBR3, THBS1, THNSL2, THPO, TIMP1, TNF, TNFRSF11, TNFRSF1A, TNFRSF9, TNFRSF10, TNFSF11, TNFSF12, TNFSF12-, TNFSF13, TNFSF13B, TNFSF14, TNFSF15, TNFSF18, TNFSF4, TNFSF8, TNFSF9, TRIM16, TSLP, TWSG1, TXLNA, VASN, VEGFA, VSTM1, WFIKKN1, WFIKKN2, WNT1, WNT2, WNT5A, WNT7A, and ZFP36.
The sequences of these genes are known and available in the art.
Indications and Standards of Care in ACT (iNKT) Therapy
In some embodiment, the genome-edited immune effector cells disclosed herein, and/or generated using the methods disclosed herein, express one or more chimeric antigen receptors (CARs) and can be used as a medicament, i.e., for the treatment of disease. In many embodiments, the cells are iNKT cells.
Cells disclosed herein, and/or generated using the methods disclosed herein, may be used in immunotherapy and adoptive cell transfer, for the treatment, or the manufacture of a medicament for treatment, of cancers, autoimmune diseases, infectious diseases, and other conditions.
The cancer may be a hematologic malignancy or solid tumor. Hematologic malignancies include leukemias, lymphomas, multiple myeloma, and subtypes thereof. Lymphomas can be classified various ways, often based on the underlying type of malignant cell, including Hodgkin's lymphoma (often cancers of Reed-Sternberg cells, but also sometimes originating in B cells; all other lymphomas are non-Hodgkin's lymphomas), B-cell lymphomas, T-cell lymphomas, mantle cell lymphomas, Burkitt's lymphoma, follicular lymphoma, and others as defined herein and known in the art.
B-cell lymphomas include, but are not limited to, diffuse large B-cell lymphoma (DLBCL), chronic lymphocytic leukemia (CLL)/small lymphocytic lymphoma (SLL), and others as defined herein and known in the art.
T-cell lymphomas include T-cell acute lymphoblastic leukemia/lymphoma (T-ALL), peripheral T-cell lymphoma (PTCL), T-cell chronic lymphocytic leukemia (T-CLL), Sezary syndrome, and others as defined herein and known in the art.
Leukemias include Acute myeloid (or myelogenous) leukemia (AML), chronic myeloid (or myelogenous) leukemia (CML), acute lymphocytic (or lymphoblastic) leukemia (ALL), chronic lymphocytic leukemia (CLL) hairy cell leukemia (sometimes classified as a lymphoma), and others as defined herein and known in the art.
Plasma cell cell malignancies include lymphoplasmacytic lymphoma, plasmacytoma, and multiple myeloma.
In some embodiments, the medicament can be used for treating cancer in a patient, particularly for the treatment of solid tumors such as melanomas, neuroblastomas, gliomas or carcinomas such as tumors of the brain, head and neck, breast, lung (e.g., non-small cell lung cancer, NSCLC), reproductive tract (e.g., ovary), upper digestive tract, pancreas, liver, renal system (e.g., kidneys), bladder, prostate and colorectum.
In another embodiment, the medicament can be used for treating cancer in a patient, particularly for the treatment of hematologic malignancies selected from multiple myeloma and acute myeloid leukemia (AML) and for T-cell malignancies selected from T-cell acute lymphoblastic leukemia (T-ALL), non-Hodgkin's lymphoma, and T-cell chronic lymphocytic leukemia (T-CLL).
In some embodiments, the cells may be used in the treatment of autoimmune diseases such as lupus, autoimmune (rheumatoid) arthritis, multiple sclerosis, transplant rejection, Crohn's disease, ulcerative colitis, dermatitis, and the like. In some embodiments, the cells are chimeric autoantibody receptor T-cells, or iNKT displaying antigens or fragments thereof, instead of antibody fragments; in this version of adoptive cell transfer, the B cells that cause autoimmune diseases will attempt to attack the engineered T cells, which will respond by killing them.
In some embodiments, the cells may be used in the treatment of infectious diseases such as HIV and tuberculosis.
In another embodiment, the iNKT cells of the present disclosure can undergo robust in vivo T cell expansion and can persist for an extended amount of time.
In some embodiments, the treatment of a patient with iNKT cells of the present disclosure can be ameliorating, curative or prophylactic. It may be either part of an autologous immunotherapy or part of an allogenic immunotherapy treatment. By autologous, it is meant that cells, cell line or population of cells used for treating patients are originating from said patient or from a Human Leucocyte Antigen (HLA) compatible donor. By allogeneic, is meant that the cells or population of cells used for treating patients are not originating from the patient but from a donor.
The treatment of cancer with iNKT cells of the present disclosure may be in combination with one or more therapies selected from antibody therapy, chemotherapy, cytokine therapy, dendritic cell therapy, gene therapy, hormone therapy, radiotherapy, laser light therapy, and radiation therapy.
The administration of iNKT cells or a population of iNKT cells of the present disclosure of the present disclosure be carried out by aerosol inhalation, injection, ingestion, transfusion, implantation or transplantation. The iNKT cells compositions described herein, i.e., mono CAR, dual CAR, tandem CARs, may be administered to a patient subcutaneously, intradermally, intratumorally, intranodally, intramedullary, intramuscularly, by intravenous or intralymphatic injection, or intraperitoneally. In one embodiment, the cell compositions of the present disclosure are preferably administered by intravenous injection.
The administration of iNKT cells or a population of iNKT cells can consist of the administration of 104-109 cells per kg body weight, preferably 105 to 106 cells/kg body weight including all integer values of cell numbers within those ranges. The iNKT cells or a population of iNKT cells can be administrated in one or more doses. In another embodiment, the effective amount of iNKT cells or a population of iNKT cells are administrated as a single dose. In another embodiment, the effective amount of cells are administered as more than one dose over a period time. Timing of administration is within the judgment of a health care provider and depends on the clinical condition of the patient. The iNKT cells or a population of iNKT cells may be obtained from any source, such as a blood bank or a donor. While the needs of a patient vary, determination of optimal ranges of effective amounts of a given iNKT cell population(s) for a particular disease or conditions are within the skill of the art. An effective amount means an amount which provides a therapeutic or prophylactic benefit. The dosage administered will be dependent upon the age, health and weight of the patient recipient, type of concurrent treatment, if any, frequency of treatment, and the nature of the effect desired.
In another embodiment, the effective amount of iNKT cells or a population of iNKT cells or composition comprising those iNKT cells are administered parenterally. The administration can be an intravenous administration. The administration of iNKT cells or a population of iNKT cells or composition comprising those iNKT cells can be directly done by injection within a tumor.
In one embodiment of the present disclosure, the iNKT cells or a population of the iNKT cells are administered to a patient in conjunction with, e.g., before, simultaneously or following, any number of relevant treatment modalities, including but not limited to, treatment with cytokines, or expression of cytokines from within the iNKT cells, that enhance iNKT cell proliferation and persistence and, include but not limited to, IL-2, IL-7, and IL-15 or analogues thereof.
In some embodiments, the iNKT cells or a population of iNKT cells of the present disclosure may be used in combination with agents that inhibit immunosuppressive pathways, including but not limited to, inhibitors of TGFβ, interleukin 10 (IL-10), adenosine, VEGF, indoleamine 2,3 dioxygenase 1 (IDO1), indoleamine 2,3-dioxygenase 2 (IDO2), tryptophan 2-3-dioxygenase (TDO), lactate, hypoxia, arginase, and prostaglandin E2.
In another embodiment, the iNKT cells or a population of iNKT cells of the present disclosure may be used in combination with T-cell checkpoint inhibitors, including but not limited to, anti-CTLA4 (Ipilimumab) anti-PD1 (Pembrolizumab, Nivolumab, Cemiplimab), anti-PDL1 (Atezolizumab, Avelumab, Durvalumab), anti-PDL2, anti-BTLA, anti-LAG3, anti-TIM3, anti-VISTA, anti-TIGIT, and anti-KIR.
In another embodiment, the iNKT cells or a population of iNKT cells of the present disclosure may be used in combination with T cell agonists, including but not limited to, antibodies that stimulate CD28, ICOS, OX-40, CD27, 4-1BB, CD137, GITR, and HVEM.
In another embodiment, the iNKT cells or a population of iNKT cells of the present disclosure may be used in combination with therapeutic oncolytic viruses, including but not limited to, retroviruses, picornaviruses, rhabdoviruses, paramyxoviruses, reoviruses, parvoviruses, adenoviruses, herpesviruses, and poxviruses.
In another embodiment, iNKT cells may be co-administered with α-GalCer and IL-12, as both of these compounds work synergistically for iNKT activation.
In another embodiment, the iNKT cells or a population of iNKT cells of the present disclosure may be used in combination with immunostimulatory therapies, such as toll-like receptors agonists, including but not limited to, TLR3, TLR4, TLR7 and TLR9 agonists.
In another embodiment, the iNKT cells or a population of iNKT cells of the present disclosure may be used in combination with stimulator of interferon gene (STING) agonists, such as cyclic GMP-AMP synthase (cGAS).
Immune effector cell aplasia, particularly T cell aplasia is also a concern after adoptive cell transfer therapy. When the malignancy treated is a T-cell malignancy, and iNKT cells target a T cell antigen, normal T cells and their precursors expressing the antigen will become depleted, and the immune system will be compromised.
Accordingly, methods for managing these side effects are attendant to therapy. Such methods include selecting and retaining non-malignant T cells or precursors, either autologous or allogeneic (optionally engineered not to cause rejection or be rejected), for later expansion and re-infusion into the patient, after iNKT cells are exhausted or deactivated. Alternatively, iNKT cells which recognize and kill subsets of TCR-bearing cells, such as normal and malignant TRBC1+, but not TRBC2+ cells, or alternatively, TRBC2+, but not TRBC1+ cells, may be used to eradicate a T cell malignancy while preserving sufficient normal T cells to maintain normal immune system function.
Unless specifically defined herein, all technical and scientific terms used have the same meaning as commonly understood by a skilled artisan in the fields of gene therapy, biochemistry, genetics, and molecular biology. All disclosed compositions and methods similar or equivalent to those described herein can be used in the practice or testing of the present disclosure.
When ranges of values are disclosed, and the notation “from n1 . . . to n2” or “between n1 . . . and n2” is used, where n1 and n2 are the numbers, then unless otherwise specified, this notation is intended to include the numbers themselves and the range between them. This range may be integral or continuous between and including the end values. By way of example, the range “from 2 to 6 carbons” is intended to include two, three, four, five, and six carbons, since carbons come in integer units. Compare, by way of example, the range “from 1 to 3 μM (micromolar),” which is intended to include 1 μM, 3 μM, and everything in between to any number of significant figures (e.g., 1.255 μM, 2.1 μM, 2.9999 μM, etc.).
The term “about,” as used herein, is intended to qualify the numerical values which it modifies, denoting such a value as variable within a margin of error. When no particular margin of error, such as a standard deviation to a mean value given in a chart or table of data, is recited, the term “about” should be understood to mean that range which would encompass the recited value and the range which would be included by rounding up or down to that figure as well, taking into account significant figures.
The term “activation” (and other conjugations thereof) in reference to cells is generally understood to be synonymous with “stimulating” and as used herein refers to treatment of cells that results in expansion of cell populations. In T cells, activation is often accomplished by exposure to CD2 and CD28 (and sometimes CD2 as well) agonists, typically antibodies, optionally coated onto magnetic beads or conjugated to a colloidal polymeric matrix.
The term “antigen” as used herein is a cell surface protein recognized by (i.e., that is the target of) T cell receptor or chimeric antigen receptor. In the classical sense antigens are substances, typically proteins, that are recognized by antibodies, but the definitions overlap insofar as the CAR comprises antibody-derived domains such as light (VL) and heavy (VH) chains recognizing one or more antigen(s).
The term “cancer” refers to a malignancy or abnormal growth of cells in the body. Many different cancers can be characterized or identified by particular cell surface proteins or molecules. Thus, in general terms, cancer in accordance with the present disclosure may refer to any malignancy that may be treated with an immune effector cell, such as a iNKT cell as described herein, in which the immune effector cell recognizes and binds to the cell surface protein on the cancer cell. As used herein, cancer may refer to a hematologic malignancy, such as multiple myeloma, a T-cell malignancy, or a B cell malignancy. T cell malignancies may include, but are not limited to, T-cell acute lymphoblastic leukemia (T-ALL) or non-Hodgkin's lymphoma. A cancer may also refer to a solid tumor, such as including, but not limited to, cervical cancer, pancreatic cancer, ovarian cancer, mesothelioma, and lung cancer.
A “cell surface protein” as used herein is a protein (or protein complex) expressed by a cell at least in part on the surface of the cell. Examples of cell surface proteins include the TCR (and subunits thereof) and CD7.
A “chimeric antigen receptor” or “CAR” as used herein and generally used in the art, refers to a recombinant fusion protein that has an extracellular ligand-binding domain, a transmembrane domain, and a signaling transducing domain that directs the cell to perform a specialized function upon binding of the extracellular ligand-binding domain to a component present on the target cell. For example, a CAR can have an antibody-based specificity for a desired antigen (e.g., tumor antigen) with a T cell receptor-activating intracellular domain to generate a chimeric protein that exhibits specific anti-target cellular immune activity. First-generation CARs include an extracellular ligand-binding domain and signaling transducing domain, commonly CD3 or FccRly. Second generation CARs are built upon first generation CAR constructs by including an intracellular costimulatory domain, commonly 4-1BB or CD28. These costimulatory domains help enhance iNKT cell cytotoxicity and proliferation compared to first generation CARs. The third generation CARs include multiple costimulatory domains, primarily to increase iNKT cell proliferation and persistence. Chimeric antigen receptors are distinguished from other antigen binding agents by their ability both to bind MHC-independent antigens and transduce activation signals via their intracellular domain.
A “CAR-bearing immune effector cell” is an immune effector cell which has been transduced with at least one CAR. A “CAR-iNKT cell” is a iNKT cell which has been transduced with at least one CAR; CAR-iNKT cells can be mono, dual, or tandem CAR-iNKT cells. CAR-iNKT cells can be autologous, meaning that they are engineered from a subject's own cells, or allogeneic, meaning that the cells are sourced from a healthy donor, and in many cases, engineered so as not to provoke a host-vs-graft or graft-vs-host reaction. Donor cells may also be sourced from cord blood or generated from induced pluripotent stem cells.
The term CAR-iNKT cell (equivalently, iNKT-CAR) means an iNKT cell that expresses a chimeric antigen receptor.
A dual iNKT-CAR cell (equivalently, iNKT-dCAR) is an iNKT-CAR cell that expresses two distinct chimeric antigen receptor polypeptides with affinity to different target antigens expressed within the same effector cell, wherein each CAR functions independently. The car may be expressed from a single or multiple polynucleotide sequences.
A tandem iNKT-CAR cell (equivalently, iNKT-tCAR) is an iNKT-CAR cell with a single chimeric antigen polypeptide containing two distinct antigen recognition domains with affinity to different targets, wherein the antigen recognition domains are linked through a peptide linker and share common costimulatory domain(s), and wherein binding of either antigen recognition domain will signal though a common costimulatory domains(s) and signaling domain.
The term “combination therapy” means the administration of two or more therapeutic agents to treat a therapeutic condition or disorder described in the present disclosure. Such administration encompasses co-administration of these therapeutic agents in a substantially simultaneous manner, such as in a single capsule having a fixed ratio of active ingredients or in multiple, separate capsules for each active ingredient. In addition, such administration also encompasses use of each type of therapeutic agent in a sequential manner. In either case, the treatment regimen will provide beneficial effects of the drug combination in treating the conditions or disorders described herein.
The term “composition” as used herein refers to an immunotherapeutic cell population combination with one or more therapeutically acceptable carriers.
The term “disease” as used herein is intended to be generally synonymous, and is used interchangeably with, the terms “disorder,” “syndrome,” and “condition” (as in medical condition), in that all reflect an abnormal condition of the human or animal body or of one of its parts that impairs normal functioning, is typically manifested by distinguishing signs and symptoms, and causes the human or animal to have a reduced duration or quality of life.
The term “fratricide” as used herein means a process which occurs when an iNKT-CAR cell becomes the target of, and is killed by, another iNKT-CAR cell comprising the same chimeric antigen receptor as the target of iNKT-CAR cell, because the targeted cell expresses the antigen specifically recognized by the chimeric antigen receptor on both cells. iNKT-CARs comprising a chimeric antigen receptor which are deficient in an antigen to which the chimeric antigen receptor specifically binds will be “fratricide-resistant.”
The term “genome-edited” as used herein means having a gene added, deleted, or modified to be non-functional. Thus, in certain embodiments, a “gene-edited iNKT cell” is an iNKT cell that has had a gene such as a CAR recognizing at least one antigen added; and/or has had a gene such as the gene(s) to the antigen(s) that are recognized by the CAR deleted.
As used herein, “suicide gene” refers to a nucleic acid sequence introduced to a iNKT cell by standard methods known in the art, that when activated result in the death of the iNKT cell. If required suicide genes may facilitate the tracking and elimination, i.e., killing, of iNKT cells in vivo. Facilitated killing of iNKT cell cells by activating a suicide gene can be accomplished by standard methods known in the art. Suicide gene systems known in the art include, but are not limited to, include (a) herpes simplex virus (HSV)-tk which turns the nontoxic prodrug ganciclovir (GCV) into GCV-triphosphate, leading to cell death by halting DNA replication, (b) iCasp9 can bind to the small molecule AP1903 and result in dimerization, which activates the intrinsic apoptotic pathway, and (c) Targetable surface antigen expressed in the transduced iNKT cells (e.g., CD20 and truncated EGFR), allowing eliminating the modified cells efficiently through complement/antibody-dependent cellular cytotoxicity (CDC/ADCC) after administration of the associated monoclonal antibody.
A “cancer cell”, for example, is a malignant T cell, malignant B cell, or malignant plasma cell.
A “malignant B cell” is a B cell derived from a B-cell malignancy. B cell malignancies include, without limitation, (DLBCL), chronic lymphocytic leukemia (CLL)/small lymphocytic lymphoma (SLL), and B cell-precursor acute lymphoblastic leukemia (ALL).
A “malignant T cell” is a T cell derived from a T-cell malignancy.
The term “T-cell malignancy” refers to a broad, highly heterogeneous grouping of malignancies derived from T-cell precursors, mature T cells, or natural killer cells. Non-limiting examples of T-cell malignancies include T-cell acute lymphoblastic leukemia/lymphoma (T-ALL), human T-cell leukemia virus type 1-positive (HTLV-1+) adult T-cell leukemia/lymphoma (ATL), T-cell prolymphocytic leukemia (T-PLL), Adult T-cell lymphoma/leukemia (HTLV-1 associated), Aggressive NK-cell leukemia, Anaplastic large-cell lymphoma (ALCL), ALK positive, Anaplastic large-cell lymphoma (ALCL), ALK negative, Angioimmunoblastic T-cell lymphoma (AITL), Breast implant-associated anaplastic large-cell lymphoma, Chronic lymphoproliferative disorder of NK cells, Extra nodal NK/T-cell lymphoma, nasal type, Enteropathy-type T-cell lymphoma, Follicular T-cell lymphoma, Hepatosplenic T-cell lymphoma, Indolent T-cell lymphoproliferative disorder of the GI tract, Monomorphic epitheliotrophic intestinal T-cell lymphoma, Mycosis fungoides, Nodal peripheral T-cell lymphoma with TFH phenotype, Peripheral T-cell lymphoma (PTCL), NOS, Primary cutaneous □□T-cell lymphoma, Primary cutaneous CD8+ aggressive epidermotropic cytotoxic T-cell lymphoma, Primary cutaneous acral CD8+ T-cell lymphoma, Primary cutaneous CD4+ small/medium T-cell lymphoproliferative disorders [Primary cutaneous anaplastic large-cell lymphoma (C-ALCL), lymphoid papulosis], Sezary syndrome, Subcutaneous, panniculitis-like T-cell lymphoma, Systemic EBV+ T-cell lymphoma of childhood, and T-cell large granular lymphocytic leukemia (LGL).
A “healthy donor,” as used herein, is one who does not have a hematologic malignancy (e.g. a T-cell malignancy).
The term “therapeutically acceptable” refers to substances which are suitable for use in contact with the tissues of patients without undue toxicity, irritation, and allergic response, are commensurate with a reasonable benefit/risk ratio, and/or are effective for their intended use.
The term “therapeutically effective” is intended to qualify the amount of active ingredients used in the treatment of a disease or disorder or on the effecting of a clinical endpoint.
As used herein, a “secretable protein” is s protein secreted by a cell which has an effect on other cells. By way of example, secretable proteins include ctyokines, chemokines, and transcription factors.
The term “donor template” refers to the reference genomic material that the cell uses as a template to repair the a double-stranded break through the homology-directed repair (HDR) DNA repair pathway. The donor template contains the piece of DNA to be inserted into the genome (containing the gene to be expressed, CAR, or marker) with two homology arms flanking the site of the double-stranded break. In some embodiments, a donor template may be an adeno-associated virus, a single-stranded DNA, or a double-stranded DNA.
The term “exposing to,” as used herein, in the context of bringing compositions of matter (such as antibodies) into intimate contact with other compositions of matter (such as cells), is intended to be synonymous with “incubated with,” and no lengthier period of time in contact is intended by the use of one term instead of the other.
The term “patient” is generally synonymous with the term “subject” and includes all mammals including humans.
The invention is further illustrated by the following examples.
The following steps may be taken to provide the gene-edited iNKT cells disclosed herein. As those of skill in the art will recognize, certain of the steps may be conducted sequentially or out of the order listed below, though perhaps leading to different efficiency.
These steps are shown as flow diagrams in
In a variation of the protocol in Example 1, a tandem CAR-iNKT recognizing two antigens can be made. In Step 4, the two antigens can be deleted from the cell surface, or suppressed as described above, but electroporation with gRNA for each of the two targets and Cas9 mRNA. In Step 5, iNKT is then transduced with a CAR that recognizes two targets. This variation is shown as a flow diagram in
In a variation of the protocol in Example 1, a dual CAR-iNKT cell targeting two antigens can be made. This variation would contain two separate CARs, each recognizing a different antigen. Additional examples of dual iNKT-CARs are given below in Example IV.
Several types of genome-edited iNKT cells may be made using the methods above.
Additional examples of tandem and dual iNKT-CARs are provided below, with and without deletion or suppression of one or more surface proteins that is/are the antigen targets of the CARs. In general, examples with deletion or suppression of more antigens will be more likely to have the benefit of greater fratricide resistance. It should be further noted that the order in which the antigens (scFV) are oriented in the tandem CARs set forth below in Table 3 is not meant to be limiting and includes tandem iNKT-CARs in either orientation. For example, the CD2xCD3c iNKT-tCAR is encompasses a tCAR with the orientation CD2-CD3ε or one with the orientation CD3ε-CD2.
Patients may be treated using cells made by the methods above, as shown in
Patients treated with the iNKT-CARs disclosed herein are expected to demonstrate significantly prolonged survival, reduced tumor burden, improvement in health, and remission.
The following assays, or variations thereon, may be used to assess efficacy of the iNKT-CARs disclosed herein.
iNKT-CAR7 for T-ALL. Testing efficacy of iNKT-CAR7 in a xenogeneic model of T-ALL: 1x105 Click Beetle Red luciferase (CBR) labeled CCRF-CEM T-ALL (99% CD7+ by FACS) cells will be injected I.V. into NSG recipients prior to infusion of 2×106 to 1×107 iNKT-CAR7 or non-targeting iNKT-CAR19 control cells i.v. on day +4. In contrast to mice receiving iNKT-CART19 or mice injected with tumor only, mice receiving iNKT-CAR7 will demonstrate significantly prolonged survival and reduced tumor burden as determined by bioluminescent imaging.
iNKT-CAR(CS1) for MM. Testing efficacy of iNKT-CAR-CS1 in a xenogeneic model of multiple myeloma: 5x105 Click Beetle Red luciferase (CBR) labeled MM.1S (99% CS1+ by FACS) cells will be injected I.V. into NSG recipients prior to infusion of 2x106 to 1x107 iNKT-CAR-CS1 or non-targeting iNKT-CAR19 control cells i.v. on day +4, or +14 or +28. In contrast to mice receiving iNKT-CAR19 or mice injected with tumor only, mice receiving iNKT-CAR-CS1 will demonstrate significantly prolonged survival and reduced tumor burden as determined by bioluminescent imaging.
Guide RNA were designed and validated for activity by Washington University Genome Engineering & iPSC. Guide RNA were designed and validated for activity by Washington University Genome Engineering & iPSC. Sequences complementary to a given gRNA may exist throughout the genome, including but not limited to the target locus. A short sequence is likelier to hybridize off-target. Similarly, some long sequences within the gRNA may have exact matches (long_0) or near matches (long_1, long_2, representing, respectively, a single or two nucleotide difference) throughout the genome. These may also hybridize off-target, in effect leading to editing of the wrong gene and diminishing editing efficiency.
Off target analysis of selected gRNA was performed for 2 exons of hCD2 (CF58 and CF59) to determine the number of sites in human genome which are an exact match or contains up to 1 or 2 mismatches, which may include the target site. The results are listed in Table 14 for Exon CF58 and Table 15 for Exon CF59.
CAAAGAGATTACGAATGCCTNGG
CAAGGCATTCGTAATCTCTTNGG
CTTGATACAGGTTTAATTCGNGG
ACAGCTGACAGGCTCGACACNGG
GATGTTTCCCATCTTGATACNGG
The gRNA sequences in Table 14 and Table 15 were normalized (% Normalization to NHEJ) for gRNA activity via next generation sequencing (NGS). GFP was used as a control. Following sequencing analysis, the following gRNAs were recommended based on off-target profile: CF58.CD2.g1 (41.2%), CF58.CD2.g23 (13.2%), CF59.CD2.g20 (26.6%), CF59.CD2.g13 (66.2%), CF59.CD2.g17 (17.5%). Guide RNA (gRNA) with normalized NHEJ frequencies equal to or greater than 15% are good candidates for cell line and animal model creation projects.
Off target analysis of selected gRNA was performed for hCD3E to determine the number of sites in human genome which are an exact match or contains up to 1 or 2 mismatches, which may include the target site. The results are listed in Table 16 for hCD3E.
GAGATGGAGACTTTATATGCNGG
TATTATGTCTGCTACCCCAGNGG
The gRNA sequences in Table 16 were normalized (% Normalization to NHEJ) for gRNA activity via next generation sequencing (NGS). GFP was used as a control. Following sequencing analysis, the following gRNAs were recommended based on off-target profile: MS1044.CD3E.sp28 (>15%) and MS1044.CD3E.sp12 (>15%). Guide RNA (gRNA) with normalized NHEJ frequencies equal to or greater than 15% are good candidates for cell line and animal model creation projects.
Off target analysis of selected gRNA was performed for 3 exons of hCD5 (Exon 3, Exon 4, and Exon 5) to determine the number of sites in human genome which are an exact match or contains up to 1 or 2 mismatches, which may include the target site. The results are listed in Table 17 for Exon 3, Table 18 for Exon 4, and Table 19 for Exon 5.
AATCATCTGCTACGGACAACNGG
GCAGACTTTTGACGCTTGACNGG
CGTTCCAACTCGAAGTGCCANGG
CCTTGAGGTAGACCTCCAGCNGG
GGCGGGGGCCTTGTCGTTGGNGG
CTCTGGAGTTGTGGTGGGCGNGG
CATAGCTGATGGTACCCCCCNGG
CGGCCAGCACTGTGCCGGCGNGG
CAAGAACTCGGCCACTTTTCNGG
GGCAAGGGCTGGTGTTCCCGNGG
The gRNA sequences in Table 17, Table 18, and Table 19 were normalized (% Normalization to NHEJ) for gRNA activity via next generation sequencing (NGS). GFP was used as a control. Following sequencing analysis, the following gRNAs were recommended based on off-target profile: Exon 3: SP597.hCD5.g2 (76.5%), SP597.hCD5.g22 (36.3%), SP597.hCD5.g39 (16.0%), SP597.hCD5.g46. Exon4: SP598.hCD5.g7, SP598.hCD5.g10 (58.5%). Exon5: SP599.hCD5.g5 (51.0%), SP599.hCD5.g30, SP599.hCD5.g42, SP599.hCD5.g58 (41.0%)
Off target analysis of selected gRNA was performed for hCSF2 to determine the number of sites in human genome which are an exact match or contains up to 1 or 2 mismatches, which may include the target site. The results are listed in Table 20 for hCSF2.
TACTCAGGTTCAGGAGACGCNGG
TCAGGAGACGCCGGGCCTCCNGG
The gRNA sequences in Table 20 were normalized (% Normalization to NHEJ) for gRNA activity via next generation sequencing (NGS). GFP was used as a control. Following sequencing analysis, the following gRNAs were recommended based on off-target profile: MS1086.CSF2.sp8 (>15%) and MS1086.CSF2.sp10 (>15%).
Off target analysis of selected gRNA was performed for 2 exons of hCTLA4 (Exon 1 and Exon 2) to determine the number of sites in human genome which are an exact match or contains up to 1 or 2 mismatches, which may include the target site. The results are listed in Table 21 for Exon 1 and Table 22 for Exon 2 for hCTLA4.
CCTTGGATTTCAGCGGCACANGG
CCTTGTGCCGCTGAAATCCANGG
CCGGGTGACAGTGCTTCGGCNGG
ACACAAAGCTGGCGATGCCTNGG
GGCCCAGCCTGCTGTGGTACNGG
The gRNA sequences in Table 21 and Table 22 were normalized (% Normalization to NHEJ) for gRNA activity via next generation sequencing (NGS). GFP was used as a control. Following sequencing analysis, the following gRNAs were recommended based on off-target profile: Exon 1: SP621.hCTLA4.g2 (>15%) and SP621.hCTLA4.g12 (>15%). Exon 2: SP622.hCTLA4.g2 (>15%), SP622.hCTLA4.g9 (>15%), and SP622.hCTLA4.g33 (>15%).
Off target analysis of selected gRNA was performed for 2 exons of hPDCD1 (CF60 and CF61) to determine the number of sites in human genome which are an exact match or contains up to 1 or 2 mismatches, which may include the target site. The results are listed in Table 23 for Exon CF60 and Table 24 for Exon CF61.
TGTAGCACCGCCCAGACGACNGG
GGCGCCCTGGCCAGTCGTCTNGG
CGGAGAGCTTCGTGCTAAACNGG
GCCCTGCTCGTGGTGACCGANGG
CACGAAGCTCTCCGATGTGTNGG
The gRNA sequences in Table 23 and Table 24 were normalized (% Normalization to NHEJ) for gRNA activity via next generation sequencing (NGS). GFP was used as a control. Following sequencing analysis, the following gRNAs were recommended based on off-target profile: CF60.PDCD1.g12 (65.6%), CF60.PDCD1.g3 (69.2%), CF61.PDCD1.g6, CF61.PDCD1.g2 (72.7%), and CF61.PDCD1.g35 (24.0%).
Off target analysis of selected gRNA was performed for 2 exons of hTIM3 (Exon 2 and Exon 3) to determine the number of sites in human genome which are an exact match or contains up to 1 or 2 mismatches, which may include the target site. The results are listed in Table 25 for Exon 2 and Table 26 for Exon 3.
AATGTGGCAACGTGGTGCTCNGG
CTAAATGGGGATTTCCGCAANGG
GCGGCTGGGGTGTAGAAGCANGG
CCAAGGATGCTTACCACCAGNGG
CCCCTGGTGGTAAGCATCCTNGG
The gRNA sequences in Table 25 and Table 26 were normalized (% Normalization to NHEJ) for gRNA activity via next generation sequencing (NGS). GFP was used as a control. Following sequencing analysis, the following gRNAs were recommended based on off-target profile: Exon 2: SP619.hTIM3.g12 (45.0%), SP619.hTIM3.g20 (60.9%), and SP619.hTIM3.g49 (45.4%). Exon 3: SP620.hTIM3.g5 (58.0%) and SP620.hTIM3.g7 (2.9%).
In a variation of the protocol in Example 1, CAR-iNKT recognizing a single antigen that can be made as in Step 1 and Step 2. Step 3 and Step 4 is omitted in this example. In Step 5, iNKT are transduced with a CAR that recognizes BCMA. CAR-iNKT cells produced by these methods are shown in
Efficacy of BCMA-CAR iNKT was tested in a 4 hr Cr release assay against BCMA+ target cells (MM1.s).
The methods disclosed above can be varied appropriately by those skilled in the art to make and confirm activity of other mono, dual, and tandem iNKT cells disclosed herein.
Although the present invention has been described with reference to specific details of certain embodiments thereof in the above examples, it will be understood that modification and variation are encompassed within the spirit and scope of the invention.
This application is a continuation of U.S. application Ser. No. 16/428,789 filed May 31, 2019, which claims the benefit of priority of U.S. Provisional Application No. 62/678,883, filed May 31, 2018, the disclosure of which is hereby incorporated by reference as if written herein in its entirety.
| Number | Date | Country | |
|---|---|---|---|
| 62678883 | May 2018 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 16428789 | May 2019 | US |
| Child | 18340417 | US |
