Patent Application
20220125846
The instant application contains a Sequence Listing which has been submitted in ASCII format via EFS-Web and is herein hereby incorporated by reference in its entirety. Said ASCII copy, created on Jan. 12, 2022, is named 045009-0053-US-SL.txt and is 24,738 bytes in size.
The present disclosure relates to alloreactive and xenoreactive T cells and methods of limiting their alloreactivity or xenoreactivity to tumor or cancer sites in order to kill tumor cells and tumor stromal cells without significant normal tissue damage for the purpose of immunotherapy against cancer.
T cell-based Immunotherapy against cancer has made major strides in recent years. T cells engrafted with chimeric antigen receptors (CARs) demonstrated remarkable efficacy in treating B cell malignancies (1-5). FDA approval of the first CAR T cell drug for B cell lymphoma in 2017 marked a major milestone in the fight against cancer. In this approach, autologous T cells from the patient are isolated and genetically modified to express CARs that recognizes the pan-B cell marker CD19. CAR T cells infused back to the patient are able to recognize cancer cells through CAR-CD19 interaction. Signals from CARs lead to T cell activation and cytotoxicity towards cancer cells. Significant challenges remain, however, in developing safe and effective T cell-based immunotherapies for a wider range of cancers, especially for solid tumors and non-B-cell hematopoietic malignancies.
A major challenge for T cell therapy against solid tumors is the heterogeneity of tumor antigen expression. To date, the success of CAR T cell therapy is largely limited to treating B cell cancers. Due to the homogeneous expression of CD19 on all cancerous B cells, complete eradication of cancer cells can be achieved. In fact, normal B cells are eliminated as well but the lack of B cell function is easily compensated with immunoglobulin infusion. In contrast, the expression of most solid tumor antigens is much more heterogeneous in terms of the types of tissues they are expressed in and expression levels among tumor cells. Many tumor antigens can be highly expressed in tumors but may also be expressed in certain normal tissues at lower levels than found in tumors (6). Moreover, tumor antigen expression within tumors is rarely uniform, with only a certain percentage of tumor cells expressing any given type of tumor antigen (7-10). Progresses have been made in minimizing “on-target, off-tumor” targeting of normal tissues by designing CARs that mediate T cell responses only to cells expressing tumor antigens at high levels (11) or cells expressing multiple tumor antigens (12-14). Heterogeneity in tumor antigen expression among tumor cells, however, remains a major roadblock. The challenge was highlighted by a recent clinical study targeting EGFRvIII (epithelial growth factor receptor variant III) for glioblastoma (10). CAR T cells infiltrated the tumors, killed EGFRvIII-positive tumor cells but failed to halt glioblastoma progression, most likely due to the expansion of EGFRvIII-negative tumor cells under the selection pressure from the CAR T cells. Similar results were observed in a study targeting IL13Rα2 for glioblastoma in animal models (15).
The challenge of target antigen heterogeneity also exists for non-B cell blood cancers. The lack of cancer-specific antigen has hampered the efforts to develop CAR T therapy for acute myeloid leukemia (AML) (16). Most targets identified today, such as CD33 and CD123, are also expressed on normal myeloid cells and hematopoietic stem cells (17, 18). Targeting these antigens therefore often requires rescue hematopoietic stem cell transplantation. Heterogeneous expression of target antigens among cancer cells is a main contributor to relapse post CAR T cell therapy. The expression of B-cell maturation antigen (BCMA) in myeloma biopsies, for example, varies in terms of both percentage and level of expression (19).
Therefore, an urgent need remains for effective strategies that can overcome antigen-negative immune escape by broadening the target to include tumor antigen-negative tumor cells and stromal cells that support tumor growth. Approaches that target alternative antigens are also needed to overcome the barriers for non-B cell hematopoietic malignancies. This disclosure addresses these needs.
The present disclosure relates to alloreactive and xenoreactive T cells and methods of limiting their alloreactivity or xenoreactivity to tumor sites or sites enriched in cancer cells in order to kill tumor cells, tumor stromal cells, and cancer cells without significant damage to normal tissues outside of the sites for the purpose of immunotherapy against cancer.
The present disclosure provides a tumor-activated alloreactive or xenoreactive T cell. The T cell can be used to kill tumor cells, tumor stromal cells, and cancer cells. Advantageously, the T cell should not cause significant normal tissue damage. Thus, a method of treating a patient having a malignancy, in particular, a solid tumor and a non-B cell hematopoietic malignancy, is also provided. A method of preparing the tumor-activated T cell and related kits are also provided.
The therapeutic methods and compositions used in these methods as described herein can be alternatively considered as a use of genetically-modified tumor-activated alloreactive or xenoreactive T cells for use in treating cancer in a patient in therapeutic need thereof, or for use in the preparation of a medicament for treating cancer. The use of the disclosed genetically-modified tumor-activated T cell can be applied to any of the methods and combinations described above and infra.
Provided is a genetically modified T cell comprising: (i) genetic disruption of expression of at least one endogenous gene encoding a molecule necessary for TCR signaling and T cell activation, (ii) an exogenous nucleotide sequence encoding a tumor-sensing receptor that releases or activates a transcription activator in response to direct or indirect binding to molecules enriched on tumor cells, in the tumor microenvironment or in tissues with blood cancer cell accumulation, and (iii) an exogenous nucleotide sequence comprising an expression cassette that expresses a copy of the disrupted endogenous gene of (i) in response to the released or activated transcription activator of (ii).
In some aspects, the at least one disrupted endogenous gene encoding a molecule necessary for TCR signaling and T cell activation encodes a transmembrane protein selected from, for example, one or more of CD3ε, CD3ζ, CD3γ, CD3δ, CD4, CD8α, CD8β, LAT, TRIM, CD45, CD28, LFA-1, CD2, CD54, CD52, CD148, and CD58. In certain embodiments, the endogenous gene disrupted is selected from CD3ε, CD3ζ, CD3γ, and CD3δ. In an embodiment, the endogenous gene disrupted is CD3ε. In some aspects, the at least one disrupted endogenous gene encoding a molecule necessary for TCR signaling and T cell activation encodes an intracellular signaling molecule chosen from Lck, Zap70, calcineurin, PI3K, Fyn, PLCγ, SLP76, PKCθ, AKT, and PDK1.
In aspects of the genetically modified T cell, the tumor-sensing receptor comprises (i) an extracellular domain that binds directly or indirectly to a target molecule enriched on or in at least one of tumor cells, tumor microenvironment, and tissues with blood cancer cell accumulation; and (ii) an intracellular domain that activates or releases a transcription activator in response to extracellular domain binding to the target molecule. The tumor-sensing receptor can be a Synthetic Notch (SynNotch) receptor, a Modular Extracellular Sensor Architecture (MESA) receptor, a Tango receptor, or a chimeric antigen receptor (CAR).
In some aspects, the target molecule is enriched on tumor cells and/or in the tumor microenvironment and is chosen from, for example. one or more of CD19, CD20, CD38, CD30, Her2/neu, ERBB2, CA125, MUC-1, prostate-specific membrane antigen (PSMA), CD44 surface adhesion molecule, mesothelin, carcinoembryonic antigen (CEA), epidermal growth factor receptor (EGFR), EGFRvIII, vascular endothelial growth factor receptor-2 (VEGFR2), high molecular weight-melanoma associated antigen (HMW-MAA), MAGE-A1, IL-13R-a2, GD2, 4-1BB, 5T4, adenocarcinoma antigen, alpha-fetoprotein, BAFF, B-lymphoma cell, C242 antigen, CA-125, carbonic anhydrase 9 (CA-IX), C-MET, CCR4, CD152, CD19, CD20, CD200, CD22, CD221, CD23 (IgE receptor), CD28, CD30 (TNFRSF8), CD33, CD4, CD40, CD44 v6, CD51, CD52, CD56, CD74, CD80, CEA, CNT0888, CTLA-4, DRS, EGFR, EpCAM, FAP, fibronectin extra domain-B, folate receptor 1, GD2, GD3 ganglioside, glycoprotein 75, GPNMB, HGF, human scatter factor receptor kinase, IGF-1 receptor, IGF-I, IgGl, Ll-CAM, IL-13, IL-6, insulin-like growth factor I receptor, integrin αvβ3, MORAb-009, MS4A1, MUC1, mucin CanAg, N-glycolylneuraminic acid, NPC-IC, PDGF-Ra, PDL192, phosphatidylserine, prostatic carcinoma cells, RANKL, RON, ROR1, SCH 900105, SDC1, SLAMF7, TAG-72, tenascin C, TGF beta 2, TGF-β, TRAIL-R1, TRAIL-R2, tumor antigen CTAA16.88, VEGF-A, VEGFR-1, VEGFR2, mesothelin, NKG2D, CD147, NKR2, B7H3, and vimentin. In certain embodiments, the target molecule is selected from Her2/neu, EGFRvIII, CD19, IL-13RR-a2, mesothelin, MUCI, EpCAM, GD2 and CEA. In certain embodiments, target molecule is selected from Her2/neu, EGFRvIII, CD19, IL-13RR-a2, mesothelin, and MUCI. In certain embodiments, the target molecule is selected from Her2/neu, EGFRvIII, and CD19. In an embodiment, the target molecule is Her2/neu.
In some aspects, the target molecule is enriched in a tissue with blood cancer cell accumulation, and wherein the tissue is lymphoid and/or bone marrow tissue. In certain embodiments, the target molecule can be chosen from CD45, CD19, CD20, CD4, CD8, CD2, CCR4, CD58, CD28, CD23, CD69, CD25, CD33, CD123 and CCL-1.
In some aspects, the extracellular domain of the tumor-sensing receptor is a single chain variable fragment (scFv), a Fab fragment, a designed ankyrin repeat protein (DARPin), a nanobody, a TCR, a Fc receptor, a growth factor receptor, a chemokine receptor, or a hormone receptor.
In some aspects, the tumor-sensing receptor is a chimeric antigen receptor, wherein a downstream transcription factor is activated through signaling pathways activated in response to extracellular domain binding to the target molecule.
In certain embodiments, the expression cassette encoding the copy of the disrupted endogenous gene comprises a transcription control element driving expression of the copy of the disrupted endogenous gene is bound by a transcription activator selected from the group consisting of Gal4-VP64, Notch, tet transactivator, NFAT, AP-1, NFκB/Rel, NR4A1 (Nur77), T-Bet, IRF4, STATs and eomesodermin (Eomes). In certain embodiments, the expression cassette is selected from Gal4-CD3-PGK-BFP, NR4A-CD3-PKG-BFP, and NFAT-CD3-PKG-BFP. In certain embodiments, the tumor sensing receptor and expression cassette are selected from SynNotch and Gal4-CD3-PGK-BFP, CAR and NR4A-CD3-PKG-BFP, and CAR and NFAT-CD3-PKG-BFP.
In certain aspects, the sample of T cells is from a donor individual, and wherein the donor individual has at least one HLA allele mismatch relative to an intended recipient and the at least one HLA allele mismatch is located in a locus selected from the group consisting of: HLA-A, HLA-B, HLA-C, HLA-DRB1, HLA-DQA1, HLA-DQB1, HLA-DPA1 and HLA-DPB1, thereby producing tumor-activated alloreactive T cells. In certain embodiments, the at least one HLA allele mismatch is located in a locus selected from the group consisting of: HLA-A, HLA-B, HLA-C, and HLA-DRB1. In certain embodiments, the HLA allele mismatch comprises four alleles of, HLA-A, HLA-B, HLA-C, and HLA-DRB1, six alleles of, HLA-A, HLA-B, HLA-C, and HLA-DRB1 or all eight alleles of HLA-A, HLA-B, HLA-C, and HLA-DRB1. In an embodiment, the HLA allele mismatch comprises all eight alleles of HLA-A, HLA-B, HLA-C, and HLA-DRB1.
In certain embodiments, the endogenous gene disrupted is CD3c, the target molecule is selected from Her2/neu, EGFRvIII, and CD19, and the tumor sensing receptor is SynNotch or CAR. In certain embodiments, the endogenous gene disrupted is CD3c, the target molecule is selected from Her2/neu, EGFRvIII, and CD19, the tumor sensing receptor is SynNotch, and the expression cassette is Gal4-CD3-PGK-BFP. In an embodiment, the endogenous gene disrupted is CD3ε, the target molecule is Her2/neu, the tumor sensing receptor is SynNotch, and the expression cassette is Gal4-CD3-PGK-BFP. In an embodiment, the endogenous gene disrupted is CD3ε, the target molecule is Her2/neu, the tumor sensing receptor is CAR, and the expression cassette is NFAT-CD3-PGK-BFP. In an embodiment, the endogenous gene disrupted is CD3ε, the target molecule is Her2/neu, the tumor sensing receptor is CAR, and the expression cassette is NFAT-CD3-PGK-BFP. In an embodiment, the endogenous gene disrupted is CD3ε, the target molecule is CD19, the tumor sensing receptor is SynNotch, and the expression cassette is Gal4-CD3-PGK-BFP.
Further provided is a method for producing tumor-activated alloreactive or xenoreactive T cells. The method comprises a) selecting a sample of T cells from a donor individual, or from a donor animal; b) optionally stimulating the sample of T cells to proliferate; c) abrogating the expression or function of at least one molecule necessary for TCR signaling and T cell activation in the T cells to render the T cells activation-incompetent; and d) modifying the T cells to (i) express a recombinant receptor that specifically binds to a target molecule enriched on or in at least one of tumor cells, tumor microenvironment, and a tissue with blood cancer cell accumulation, wherein binding of the recombinant receptor with the target molecule releases or activates a transcription activator; and (ii) introduce an expression cassette that enables the transcription activator in (i) to drive the expression of the molecule abrogated in c), thereby restores the expression or function of the abrogated molecule, and thereby restores the ability of the T cells to activate through antigen recognition by TCR, thereby producing tumor-activated alloreactive or xenoreactive T cells. In the method, step d) is carried out before step c), step c) is carried out before step d), or steps c) and d) are performed at the same time.
In certain aspects of the method, the sample of T cells is from a donor individual, and wherein the donor individual has at least one HLA allele mismatch relative to an intended recipient and the at least one HLA allele mismatch is located in a locus selected from the group consisting of: HLA-A, HLA-B, HLA-C, HLA-DRB1, HLA-DQA1, HLA-DQB1, HLA-DPA1 and HLA-DPB1, thereby producing tumor-activated alloreactive T cells. In certain embodiments, the at least one HLA allele mismatch is located in a locus selected from the group consisting of: HLA-A, HLA-B, HLA-C, and HLA-DRB1. In certain embodiments, the HLA allele mismatch comprises four alleles of, HLA-A, HLA-B, HLA-C, and HLA-DRB1, six alleles of, HLA-A, HLA-B, HLA-C, and HLA-DRB1 or all eight alleles of HLA-A, HLA-B, HLA-C, and HLA-DRB1. In an embodiment, the HLA allele mismatch comprises all eight alleles of HLA-A, HLA-B, HLA-C, and HLA-DRB1.
In certain aspects of the method, step b) comprises: (i) co-culturing donor T cells with cells from an intended recipient; (ii) co-culturing donor T cells with cells from a second donor that has at least one HLA allele matched with the intended recipient, and (ii) is mismatched with the T cell donor; (iii) co-culturing donor T cells with a cell line expressing a least one HLA allele of the intended recipient; (iv) co-culturing donor T cells with an artificial surface coated with at least one protein encoded by at least one HLA allele of the intended recipient.
In certain embodiments of the method, the cells used to stimulate T cells in step b) comprise: (i) tumor cells isolated from the patient; (ii) PMBCs isolated from the patient; and/or (iii) mature monocyte-derived dendritic cells (MoDCs) generated monocytes isolated from PBMCs of the patient. In an embodiment, the MoDCs are pulsed with the lysate of tumor cells isolated from the patient or pulsed with the lysate of a tumor cell line derived from a tumor of the same type from a different individual.
In certain embodiments of making the T cells, the at least one molecule necessary for TCR signaling and T cell activation is a cell surface molecule chosen from CD3ε, CD3, CD3γ, CD3δ, CD4, CD8α, CD8β, LAT, TRIM, CD45, CD28, LFA-1, CD2, CD54, CD52, CD148, and CD58, or an intracellular signaling molecule chosen from Lck, Zap70, calcineurin, PI3K, Fyn, PLCγ, NFAT, SLP76, PKCθ, NFκB, AKT, and PDK1. In certain embodiments, the endogenous gene disrupted is selected from CD3ε, CD3ζ, CD3γ, and CD3δ. In an embodiment, the endogenous gene disrupted is CD3ε.
In In certain embodiments of the method, the molecule necessary for TCR signaling and T cell activation is disrupted in step b) using a method comprising (i) CRISPR-Cas; (ii) transcription activator-like effector nuclease (TALEN), (iii) megaTALS, (iv) a zinc-finger nuclease; and/or (v) homing endonuclease.
In certain aspects of the method, step d) comprises introducing a nucleic acid encoding a tumor-sensing receptor into T cells, wherein the tumor-sensing receptor comprises (i) an extracellular domain that binds directly or indirectly to a target molecule enriched on or in at least one of tumor cells, tumor microenvironment, and tissues with blood cancer cell accumulation; and (ii) an intracellular domain that activates or releases a transcription activator in response to extracellular domain binding to the target molecule.
In certain aspects of the method, step d) comprises introducing a nucleic acid encoding an expression cassette into T cells, wherein the expression cassette comprises (i) a transcription control element (TCE) that can be bound by the transcription activator activated or released by the tumor sensing receptor; and (ii) a DNA sequence that encodes a copy of the gene disrupted in step c), thereby enables the expression of the disrupted gene in response to tumor sensing receptor binding to target molecule enriched on or in at least one of tumor cells, tumor microenvironment, and tissues with cancer cell accumulation. The DNA sequence that encodes a copy of the gene disrupted in step c) contains one or more silent mutations that do not alter the protein sequence that the DNA encodes but render it resistant to the method used to disrupt the endogenous gene.
In certain embodiments of the method, the DNA sequences encoding the tumor-sensing receptor and the expression cassette are introduced to T cells in step d) using a method comprising (i) retroviral vectors; (ii) lentiviral vectors; and/or (iii) transposon vectors such as Sleeping Beauty (Addgene) and piggyBac (VectorBuilder).
In certain embodiments of making the T cells. the target molecule is enriched on tumor cells and/or in the tumor microenvironment and can be chosen, for example, from CD19, CD20, CD38, CD30, Her2/neu, ERBB2, CA125, MUC-1, prostate-specific membrane antigen (PSMA), CD44 surface adhesion molecule, mesothelin, carcinoembryonic antigen (CEA), epidermal growth factor receptor (EGFR), EGFRvIII, vascular endothelial growth factor receptor-2 (VEGFR2), high molecular weight-melanoma associated antigen (HMW-MAA), MAGE-A1, IL-13R-a2, GD2, 4-1BB, 5T4, adenocarcinoma antigen, alpha-fetoprotein, BAFF, B-lymphoma cell, C242 antigen, CA-125, carbonic anhydrase 9 (CA-IX), C-MET, CCR4, CD152, CD19, CD20, CD200, CD22, CD221, CD23 (IgE receptor), CD28, CD30 (TNFRSF8), CD33, CD4, CD40, CD44 v6, CD51, CD52, CD56, CD74, CD80, CEA, CNT0888, CTLA-4, DRS, EGFR, EpCAM, FAP, fibronectin extra domain-B, folate receptor 1, GD2, GD3 ganglioside, glycoprotein 75, GPNMB, HGF, human scatter factor receptor kinase, IGF-1 receptor, IGF-I, IgGl, Ll-CAM, IL-13, IL-6, insulin-like growth factor I receptor, integrin αvβ3, MORAb-009, MS4A1, MUC1, mucin CanAg, N-glycolylneuraminic acid, NPC-IC, PDGF-Ra, PDL192, phosphatidylserine, prostatic carcinoma cells, RANKL, RON, ROR1, SCH 900105, SDC1, SLAMF7, TAG-72, tenascin C, TGF beta 2, TGF-β, TRAIL-R1, TRAIL-R2, tumor antigen CTAA16.88, VEGF-A, VEGFR-1, VEGFR2, mesothelin, NKG2D, CD147, NKR2, B7H3, and vimentin, or wherein the target molecule is enriched in a tissue with blood cancer cell accumulation, wherein the tissue is lymphoid and/or bone marrow tissue, and wherein the target molecule is chosen from CD45, CD19, CD20, CD4, CD8, CD2, CCR4, CD58, CD28, CD23, CD69, CD25, CD33, CD123 and CCL-1. In certain embodiments, the target molecule is selected from Her2/neu, EGFRvIII, CD19, IL-13RR-a2, mesothelin, MUCI, EpCAM, GD2 and CEA. In certain embodiments, the target molecule is selected from Her2/neu, EGFRvIII, CD19, IL-13RR-a2, mesothelin, and MUCI. In certain embodiments, the target molecule is selected from Her2/neu, EGFRvIII, and CD19. In an embodiment, the target molecule is Her2/neu.
In certain embodiments, the expression cassette encoding the copy of the disrupted endogenous gene comprises a transcription control element driving expression of the copy of the disrupted endogenous gene is bound by a transcription activator selected from the group consisting of Gal4-VP64, Notch, tet transactivator, NFAT, AP-1, NFκB/Rel, NR4A1 (Nur77), T-Bet, IRF4, STATs and eomesodermin (Eomes). In certain embodiments, the expression cassette is selected from Gal4-CD3-PGK-BFP, NR4A-CD3-PKG-BFP, and NFAT-CD3-PKG-BFP. In certain embodiments, the tumor sensing receptor and expression cassette are selected from SynNotch and Gal4-CD3-PGK-BFP, CAR and NR4A-CD3-PKG-BFP, and CAR and NFAT-CD3-PKG-BFP.
In certain embodiments, the endogenous gene disrupted is CD3c, the target molecule is selected from Her2/neu, EGFRvIII, and CD19, and the tumor sensing receptor is SynNotch. In certain embodiments, the endogenous gene disrupted is CD3ε, the target molecule is selected from Her2/neu, EGFRvIII, and CD19, the tumor sensing receptor is SynNotch, and the expression cassette is Gal4-CD3-PGK-BFP. In an embodiment, the endogenous gene disrupted is CD3ε, the target molecule is Her2/neu, the tumor sensing receptor is SynNotch, and the expression cassette is Gal4-CD3-PGK-BFP. In certain embodiments, the endogenous gene disrupted is CD3ε, the target molecule is selected from Her2/neu, EGFRvIII, and CD19, and the tumor sensing receptor is CAR. In an embodiment, the endogenous gene disrupted is CD3ε, the target molecule is Her2/neu, the tumor sensing receptor is CAR, and the expression cassette is NFAT-CD3-PGK-BFP.
A method of treating cancer in a patient is also provided. The method comprises administering T cells as described above or herein or prepared by any method described above and herein, to a patient in need thereof. In certain aspects, the T cells are tumor-activated alloreactive T cells which are alloreactive with respect to the patient.
The accompanying drawings are incorporated in and constitute a part of this specification and illustrate various methods and compositions disclosed herein. However, the disclosure not limited to the precise arrangements and instrumentalities of the embodiments depicted in the drawings.
The present disclosure is directed to a tumor-activated alloreactive or xenoreactive T cell, a method of making the tumor-activated alloreactive or xenoreactive T cell, and methods of using the tumor-activated alloreactive or xenoreactive T cell.
Unless defined otherwise, all technical and scientific terms used herein generally have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting.
The following abbreviations/acronyms have the following meanings unless otherwise specified:
cDNA complementary DNA
DNA deoxyribonucleic acid
EDTA ethylenediaminetetraacetic acid
kDa kiloDalton
MW molecular weight
NCBI National Center for Biotechnology Information
PEG polyethyleneglycol
PI isoelectric point
ppm parts per million
PVA poly(vinyl alcohol)
PVP poly(vinylpyrrolidone)
RNA ribonucleic acid
SDS-PAGE sodium dodecyl sulfate polyacrylamide gel electrophoresis
w/v weight/volume
w/w weight/weight
v/v volume/volume
wt % weight percent
° C. degrees Centigrade
H2O water
dH2O or DI deionized water
dIH2O deionized water, Milli-Q filtration
g or gm grams
μg micrograms
mg milligrams
kg kilograms
μL and μl microliters
mL and ml milliliters
mm millimeters
micrometer
M molar
mM millimolar
micromolar
U units
sec seconds
min(s) minute/minutes
hr(s) hour/hours
ETOH ethanol
eq. equivalents
N normal
Generally, the nomenclature used herein and the laboratory procedures in cell culture, molecular genetics, organic chemistry, and nucleic acid chemistry and hybridization are those well known and commonly employed in the art.
Standard techniques are used for nucleic acid and peptide synthesis. The techniques and procedures are generally performed according to conventional methods in the art and various general references (e.g., Sambrook and Russell, 2001, M
The nomenclature used herein and the laboratory procedures used in analytical chemistry and organic syntheses described below are those well known and commonly employed in the art. Standard techniques or modifications thereof, are used for chemical syntheses and chemical analyses.
As used herein, each of the following terms has the meaning associated with it in this section.
The articles “a” and “an” are used herein to refer to one or to more than one (i.e., to at least one) of the grammatical object of the article. By way of example, “an element” means one element or more than one element.
It must be noted that as used herein, the singular forms “a”, “an”, and “the” include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to “an antibody” includes a plurality of such antibodies and reference to “the dosage” includes reference to one or more dosages and equivalents thereof known to those skilled in the art, and so forth.
“About” as used herein when referring to a measurable value such as an amount, a temporal duration, and the like, is meant to encompass variations of +/−20% or +/−10%, more preferably +/−5%, even more preferably +/−1%, and still more preferably +/−0.1% from the specified value, as such variations are appropriate to perform the disclosed methods.
As used herein, the term “autologous” is meant to refer to any material derived from the same individual to which it is later to be re-introduced into the individual.
An “effective amount” as used herein, means an amount of a therapeutic compounds or combination thereof, when administered to a patient suffering from a malignancy provides a therapeutic benefit in alleviating one or more manifestations of the malignancy. It is understood, however, that the full therapeutic effect does not necessarily occur by administration of one dose, and may occur only after administration of a series of doses. Thus, an effective amount may be administered in one or more administrations. In the context of therapeutic or prophylactic applications, the amount of active agent administered to the subject will depend on the type and severity of the disease or condition and on the characteristics of the subject, such as general health, age, sex, body weight and tolerance to drugs. It will also depend on the degree, severity and type of disease or condition. The skilled artisan will be able to determine appropriate dosages depending on these and other factors.
As used herein, the term “individual” or “patient” or “subject” (as in the subject of the treatment) refers to any animal (e.g., a mammal), including, but not limited to humans, non-human primates, rodents, and the like. The individual is, in one embodiment, a human being. Typically, the terms “individual”, “subject” and “patient” are used interchangeably herein in reference to a human subject.
As used herein, the term “donor” refers to the individual person or animal from whom the T cells to be manipulated and used as therapeutics are obtained.
As used herein, a “recipient” refers to an individual, patient, or subject to whom the T-cells of the disclosure are intended to be administered and/or who receives the T-cells of the disclosure. A “recipient” may refer to a category of individual, patient or subject having a common characteristic, such as a particular HLA profile.
The term “HLA mismatched” refers to the condition that the HLA alleles expressed in the tissues of a first individual person are different from those in the tissues of a second individual person. The term specifically refers to the alleles in the highly polymorphic loci HLA-A, HLA-B, HLA-C, DRB1, DPA1, DPB1, DQA1, and DQB1.
The term “allogeneic” refers to the source of T cells used for manipulation and therapy are taken from a person other than the patient.
The term “alloreactive” refers to the ability of certain T cells of an individual person to react to cells and tissues of another individual person with mismatched HLA through TCR recognition of mismatched HLA and antigens presented by the mismatched HLA molecules.
The term “xenogeneic” refers to the source of T cells used for manipulation and therapy are taken from a non-human animal.
The term “xenoreactive” refers to the ability of certain T cells from an individual of a certain species to react to the cells and tissues of an individual of a different species through TCR recognition of mismatched HLA and antigens presented by mismatched HLA molecules.
As used herein, a “normal subject” or “control subject” refers, depending on the context, to a subject not suffering from a malignancy.
As used herein, a “control sample” refers to a sample from a control subject or a sample representative of a population of control subjects.
To “treat” a disease as the term is used herein, means to reduce the frequency or severity of at least one sign or symptom of a disease or disorder experienced by a subject. Treating may include the postponement of further disease progression, or reduction in the severity of symptoms that have or are expected to develop, ameliorating existing symptoms and preventing additional symptoms.
An “antibody” (Ab) shall include, without limitation, an immunoglobulin which binds specifically to an antigen and comprises at least two heavy (H) chains and two light (L) chains interconnected by disulfide bonds, or an antigen-binding portion thereof. Each H chain comprises a heavy chain variable region (abbreviated herein as VH) and a heavy chain constant region. The heavy chain constant region comprises three constant domains, CH1, CH2 and CH3. Each light chain comprises a light chain variable region (abbreviated herein as VL) and a light chain constant region. The light chain constant region comprises one constant domain, CL. The VH and VL regions can be further subdivided into regions of hypervariability, termed complementarity determining regions (CDRs), interspersed with regions that are more conserved, termed framework regions (FR). Each VH and VL comprises three CDRs and four FRs, arranged from amino-terminus to carboxy-terminus in the following order: FR1, CDR1, FR2, CDR2, FR3, CDR3, FR4. The variable regions of the heavy and light chains contain a binding domain that interacts with an antigen. The antibodies may exist in a variety of forms including, for example, polyclonal antibodies, monoclonal antibodies, intracellular antibodies (“intrabodies”), Fv, Fab and F(ab)2, as well as single chain antibodies (scFv), heavy chain antibodies, such as camelid antibodies, and humanized antibodies (Harlow et al., 1999, Using A
An “antigen binding portion” of an Ab (also called an “antigen-binding fragment”) or antigen binding portion thereof refers to one or more sequences of an Ab (full length or fragment of the full length antibody) that retain the ability to bind specifically to the antigen bound by the whole Ab. Examples of an antigen-binding fragment include intrabody, bispecific antibody, Fab, F(ab′)2, scFv (single-chain variable fragment), Fab′, dsFv, sc(Fv)2, and scFv-Fc.
The term “nanobody” (Nb), as used herein, refers to the smallest antigen binding fragment or single variable domain (VHH) derived from naturally-occurring heavy chain antibody and is known to the person skilled in the art. They are derived from heavy chain only antibodies, seen in camelids (Hamers-Casterman et al., 1993; Desmyter et al., 1996). In the family of “camelids” immunoglobulins devoid of light polypeptide chains are found. “Camelids” comprise old world camelids (Camelus bactrianus and Camelus dromedarius) and new world camelids (for example, Llama paccos, Llama glama, Llama guanicoe and Llama vicugna). A single variable domain heavy chain antibody is referred to herein as a nanobody or a VHH antibody
As used herein, the term “variable domain” refers to immunoglobulin variable domains defined by Kabat et al., SEQUENCES OF IMMUNOLOGICAL INTEREST, 5th ed., U.S. Dept. Health & Human Services, Washington, D.C. (1991). The numbering and positioning of CDR amino acid residues within the variable domains is in accordance with the well-known Kabat numbering convention. VH, “variable heavy chain” and “variable heavy chain domain” refer to the variable domain of a heavy chain. VL, “variable light chain” and “variable light chain domain” refer to the variable domain of a light chain.
A “humanized” antibody refers to an Ab in which some, most or all of the amino acids outside the CDR domains of a non-human Ab are replaced with corresponding amino acids derived from human immunoglobulins. In one embodiment of a humanized form of an Ab, some, most or all of the amino acids outside the CDR domains have been replaced with amino acids from human immunoglobulins, whereas some, most or all amino acids within one or more CDR regions are unchanged. Small additions, deletions, insertions, substitutions or modifications of amino acids are permissible as long as they do not abrogate the ability of the Ab to bind to a particular antigen. A “humanized” Ab retains an antigenic specificity similar to that of the original Ab.
By the term “synthetic antibody,” as used herein, is meant an antibody which is generated using recombinant DNA technology, such as, for example, an antibody expressed by a bacteriophage as described herein. The term should also be construed to mean an antibody which has been generated by the synthesis of a DNA molecule encoding the antibody and which DNA molecule expresses an antibody protein, or an amino acid sequence specifying the antibody, wherein the DNA or amino acid sequence has been obtained using synthetic DNA or amino acid sequence technology which is available and well known in the art.
Reference to the wild-type protein is understood to include the mature form of the protein. A “mature” polypeptide means a wild-type polypeptide sequence from which a signal sequence has been cleaved during expression of the polypeptide. The mature protein can be a fusion protein between the mature polypeptide and a signal sequence polypeptide.
The term “variant,” with respect to a polypeptide, refers to a polypeptide that differs from a specified wild-type, parental, or reference polypeptide in that it includes a man-made substitution, insertion, or deletion at one or more amino acid positions. Similarly, the term “variant,” with respect to a polynucleotide, refers to a polynucleotide that differs in nucleotide sequence from a specified wild-type, parental, or reference polynucleotide. The identity of the wild-type, parental, or reference polypeptide or polynucleotide will be apparent from context.
The term “recombinant,” when used in reference to a subject cell, nucleic acid, protein or vector, indicates that the subject has been modified by the introduction of a heterologous nucleic acid or protein or the alteration of a native nucleic acid or protein, or that the cell is derived from a cell so modified. Thus, for example, recombinant cells express genes that are not found within the native (non-recombinant) form of the cell, or express native genes at different levels or under different conditions than found in nature.
As used herein, the term “purified” refers to material (e.g., an isolated polypeptide or polynucleotide) that is in a relatively pure state, e.g., at least about 90% pure, at least about 95% pure, at least about 98% pure, or even at least about 99% pure.
As used herein, the term “amino acid sequence” is synonymous with the terms “polypeptide,” “protein,” and “peptide,” and are used interchangeably. Where such amino acid sequences exhibit activity, they may be referred to as an “enzyme.” The conventional one-letter or three-letter codes for amino acid residues are used, with amino acid sequences being presented in the standard amino-to-carboxy terminal orientation (i.e., N→C).
The term “nucleic acid” encompasses DNA, RNA, heteroduplexes, and synthetic molecules capable of encoding a polypeptide. Nucleic acids may be single stranded or double stranded, and may be chemical modifications. The terms “nucleic acid” and “polynucleotide” are used interchangeably. Because the genetic code is degenerate, more than one codon may be used to encode a particular amino acid, and the present compositions and methods encompass nucleotide sequences that encode a particular amino acid sequence. Unless otherwise indicated, nucleic acid sequences are presented in 5′-to-3′ orientation.
“Encoding” refers to the inherent property of specific sequences of nucleotides in a polynucleotide, such as a gene, a cDNA, or an mRNA, to serve as templates for synthesis of other polymers and macromolecules in biological processes having either a defined sequence of nucleotides (i.e., rRNA, tRNA and mRNA) or a defined sequence of amino acids and the biological properties resulting therefrom. Thus, a gene encodes a protein if transcription and translation of mRNA corresponding to that gene produces the protein in a cell or other biological system. Both the coding strand, the nucleotide sequence of which is identical to the mRNA sequence and is usually provided in sequence listings, and the non-coding strand, used as the template for transcription of a gene or cDNA, can be referred to as encoding the protein or other product of that gene or cDNA.
As used herein, “hybridization” refers to the process by which one strand of nucleic acid forms a duplex with, i.e., base pairs with, a complementary strand, as occurs during blot hybridization techniques and PCR techniques. Stringent hybridization conditions are exemplified by hybridization under the following conditions: 65° C. and 0.1×SSC (where 1×SSC=0.15 M NaCl, 0.015 M Na3 citrate, pH 7.0). Hybridized, duplex nucleic acids are characterized by a melting temperature (Tm), where one half of the hybridized nucleic acids are unpaired with the complementary strand. Mismatched nucleotides within the duplex lower the Tm. A nucleic acid encoding a variant α-amylase may have a Tm reduced by 1° C.-3° C. or more compared to a duplex formed between the nucleotide of SEQ ID NO: 2 and its identical complement.
As used herein, a “synthetic” molecule is produced by in vitro chemical or enzymatic synthesis rather than by an organism.
As used herein, the terms “transformed,” “stably transformed,” and “transgenic,” used with reference to a cell means that the cell contains a non-native (e.g., heterologous) nucleic acid sequence integrated into its genome or carried as an episome that is maintained through multiple generations.
The term “introduced” in the context of inserting a nucleic acid sequence into a cell, means “transfection”, “transformation” or “transduction,” as known in the art.
The term “heterologous” with reference to a polynucleotide or protein refers to a polynucleotide or protein that does not naturally occur in a host cell.
The term “endogenous” with reference to a polynucleotide or protein refers to a polynucleotide or protein that occurs naturally in the host cell.
As used herein, the term “expression” refers to the process by which a polypeptide is produced based on a nucleic acid sequence. The process includes both transcription and translation.
A “selective marker” or “selectable marker” refers to a gene capable of being expressed in a host cell to facilitate selection of host cells carrying the gene. Examples of selectable markers include but are not limited to antimicrobials (e.g., hygromycin, bleomycin, or chloramphenicol) and/or genes that confer a metabolic advantage over cells that lack the metabolic gene, such as a nutritional advantage on the host cell.
A “vector” refers to a polynucleotide sequence designed to introduce nucleic acids into one or more cell types. Examples of vectors include but are not limited to, linear polynucleotides, polynucleotides associated with ionic or amphiphilic compounds, plasmids, and viruses. Thus, the term “vector” includes an autonomously replicating plasmid or a virus. The term is also construed to include non-plasmid and non-viral compounds which facilitate transfer of nucleic acid into cells, such as, for example, polylysine compounds, liposomes, and the like. Vectors include cloning vectors, expression vectors, shuttle vectors, plasmids, phage particles, cassettes and the like.
An “expression vector” refers to a DNA construct comprising a DNA sequence encoding a polypeptide of interest, which coding sequence is operably linked to a suitable control sequence capable of effecting expression of the DNA in a suitable host. Such control sequences may include a promoter to effect transcription, an optional operator sequence to control transcription, a sequence encoding suitable ribosome binding sites on the mRNA, enhancers and sequences which control termination of transcription and translation. A control sequence is also referred to herein as a transcription control element (“TCE”). Expression vectors include all those known in the art, such as cosmids, plasmids (e.g., naked or contained in liposomes) and viruses (e.g., lentiviruses, retroviruses, adenoviruses, and adeno-associated viruses) that incorporate the recombinant polynucleotide.
The term “operably linked” means that specified components are in a relationship (including but not limited to juxtaposition) permitting them to function in an intended manner. For example, a regulatory sequence is operably linked to a coding sequence such that expression of the coding sequence is under control of the regulatory sequences.
Unless otherwise specified, a “nucleotide sequence encoding an amino acid sequence” includes all nucleotide sequences that are degenerate versions of each other and that encode the same amino acid sequence. The phrase nucleotide sequence that encodes a protein or an RNA may also include introns to the extent that the nucleotide sequence encoding the protein may in some version contain an intron(s).
The term “linker”, also referred to as a “spacer” or “spacer domain” as used herein interchangeably, refers to a an amino acid or sequence of amino acids that that is optionally located between two amino acid sequences in a fusion protein.
A “signal sequence” is a sequence of amino acids attached to the N-terminal portion of a protein, which facilitates the secretion of the protein outside the cell. The mature form of an extracellular protein lacks the signal sequence, which is cleaved off during the secretion process.
As used herein, “biologically active” refer to a sequence having a specified biological activity, such an enzymatic activity.
“Percent sequence identity” means that a variant has at least a certain percentage of amino acid residues identical to a wild-type protein, when aligned using the BLAST algorithm with default parameters. A variant with five amino acid substitutions or deletions of a 617 amino acid polypeptide, for example, would have a percent sequence identity of 99% (612/617 identical residues×100, rounded to the nearest whole number) relative to the mature polypeptide. Such a variant would be encompassed by a variant having “at least 99% sequence identity” to the mature polypeptide.
As used herein, the term “fusion protein” or “fusion polypeptide” is a polypeptide comprised of at least two polypeptides, optionally also comprising a linking sequence, and that are operatively linked into one continuous protein. The two polypeptides linked in a fusion protein are typically derived from the at least two independent sources (i.e., not from the same parental polypeptide), and therefore a fusion protein comprises the at least two linked polypeptides not normally found linked in nature. Typically, the at least two polypeptides can be operably attached directly by a peptide bond, or may be connected by a linking group, such as a spacer domain. An example of a fusion polypeptide is a polypeptide that functions as a receptor for an antigen, wherein an antigen binding polypeptide forming an extracellular domain is fused to a different polypeptide, forming a “chimeric antigen receptor”. Also contemplated herein are fusion proteins comprising 3, 4, 5, 6, 7, 8, 9, or 10 or more heterologous polypeptides.
As used herein, “abrogating the expression” of a gene refers to the disruption the expression of the gene.
As used herein “abrogating the function” of a gene product refers to disrupting the function and activity of the gene product.
Ranges: throughout this disclosure, various aspects of the disclosure can be presented in a range format. It should be understood that the description in range format is merely for convenience and brevity and should not be construed as an inflexible limitation on the scope of the disclosure. Accordingly, the description of a range should be considered to have specifically disclosed all the possible subranges as well as individual numerical values within that range. For example, description of a range such as from 1 to 6 should be considered to have specifically disclosed subranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6 etc., as well as individual numbers within that range, for example, 1, 2, 2.7, 3, 4, 5, 5.3, and 6. This applies regardless of the breadth of the range.
An “isolated” compound as used herein means that the compound is removed from at least one component with which the compound is naturally associated with in nature.
As envisioned in the present invention with respect to the disclosed compositions of matter and methods, in one aspect the embodiments of the invention comprise the components and/or steps disclosed herein. In another aspect, the embodiments of the invention consist essentially of the components and/or steps disclosed herein. In yet another aspect, the embodiments of the invention consist of the components and/or steps disclosed herein.
Embodiments of the present invention are described below. It is, however, expressly noted that the present invention is not limited to these embodiments, but rather the intention is that modifications that are apparent to the person skilled in the art and equivalents thereof are also included.
This disclosure exploits the alloreactivity or xenoreactivity of allogeneic T cells to broadly target cancer cells and stromal cells in tumors or tissues with blood cancer cell accumulation. Each T cell naturally expresses a unique type of T cell receptor (TCR) on the cell surface to recognize a specific antigen on target cells. In humans, the antigen is a short peptide (˜10 amino acid residues) in complex with a cell surface protein termed human leukocyte antigen (HLA). HLA class I (HLA-I) proteins comprise an a heavy chain and a (32 microglobulin (β2M). Only the α-chain participates in peptide binding and TCR interaction. The a chain is encoded by three gene loci: HLA-A, B, and C, leading to the expression of three gene products on cell surfaces. All three loci are highly polymorphic, each with hundreds to thousands of different alleles among the human population. HLA-I molecules are expressed on virtually all human cells including many tumor cells. Peptide-HLA-I antigens are recognized by TCRs expressed on CD8+ cytotoxic T cells, which kill antigen-expressing cells upon activation. HLA class II (HLA-II) molecules are αβ heterodimers and both chains take part in peptide presentation and TCR binding. HLA-II molecules are encoded by six gene loci (HLA-DRA1, DRB1, DPA1, DPB1, DQA1 and DQB1), all of which are high polymorphic except DRA1. HLA class II are mostly expressed on B cells and specialized antigen presenting cells (APCs) but can also be induced on epithelial cells and on a variety of solid tumor cells (20). Peptide-HLA-II antigens activate CD4+ helper T cells, which release inflammatory cytokines and help the survival and function of CD8+ T cells. Due to the many polymorphisms in each HLA gene locus in the human population, it is rare for any two individuals to express the same set of HLA genes. A significant proportion (1-10%) of T cells of an individual can recognize and respond to cells from another individual through TCR recognition of mismatched HLAs and the antigen presented by the mismatched HLA molecules (21, 22). T cell alloreaction, i.e., reaction to cells and tissues from a different individual of the same species, plays a critical role in organ transplant rejection through host vs. graft (HvG) activity (23). If the recipient of transplantation is immunocompromised and cannot eliminate T cells from the graft through HvG, the grafted T cells may attack the recipient's tissues and cause severe, sometimes lethal graft vs host (GvH) disease (24). For these reasons, close matches in HLA genes between the organ donor and the recipient are necessary for successful transplantation. Matches at the HLA-A, HLA-B, HLA-C and HLA-DRB1 loci have been found to be most critical for successful transplantation, suggesting their higher degree of involvement in alloreactions than HLA-DP and HLA-DQ (25). Because of the diploid nature of human genome, a match at all eight HLA-A, HLA-B, HLA-C and HLA-DRB1 loci (8/8 match) has the best chance of success in transplantation. T cell reaction to cells from a different species, i.e., xenoreaction, tends to be stronger than alloreaction (26) and is the main roadblock for using animals such as pigs as sources of organs for human transplantation. It should be noted that the term “allogeneic” refers to the source of T cells being from an individual that is different from the recipient. “Alloreactive” may refer to the reactivity of transplanted allogeneic T cells to the recipient's tissues in GvH or the reactivity of the recipient's T cells to transplanted tissues, including transplanted allogeneic T cells, in HvG. Not all allogeneic T cells have alloreactivity to the recipient's tissues. On the other hand, the alloreactive T cells used for cancer treatment in this disclosure are all allogeneic in nature. Since the T cells of this disclosure are administered to a recipient with cancer, the terms “recipient” and “patient” are used interchangeably depending on the context.
Alloreactive T cells have been used for treating cancer in special settings. Donor lymphocyte infusion (DLI) is a well-established treatment for patients who have received an allogeneic stem cell transplant for a hematological malignancy but have residual disease. In such cases, the patient receives strong chemotherapy or radiation therapy to kill cancer cells. Stem cells from a donor with partially matched HLAs are used to restore normal hematopoietic activity damaged by the radiation or chemotherapy. T cells from the same donor are then infused to eliminate residual cancer cells through alloreactions. Approximately 70% of these patients develop GvH diseases, which is correlated with lower risk of relapse of their malignancy (27, 28). A unique factor in this case is that the infused allogeneic T cells are unlikely to be eliminated by the patient through HvG because patient T cells are derived from stem cells of the same donor and tolerated to donor HLAs.
Using alloreactive or xenoreactive T cells to treat tumors therefore must overcome two main hurdles. The first is to avoid or minimize the patient's HvG activities to the allogeneic and xenogeneic T cells in order to allow the cells to survive and execute anti-tumor activities. In this regard, lympho-depletion caused by radiation or chemotherapy received by cancer patients compromises the patients' immune system and may create a window of reduced HvG activities for treatment using allogeneic T cells (29). Progresses have also been made in making allogeneic T cells “stealthy” to the recipient's immune system. Using gene-editing technologies such as CRISPR-Cas9, HLA expression can be knocked out in allogeneic T cells, making them “invisible” to recipients' T cells (30, 31). The cells can be further modified to express non-classical HLA-I molecules such as HLA-E and HLA-G to protect them from natural killer (NK) cells (32), which kill cells that do not express any HLA. The second hurdle is to restrict the destructive alloreactivity or xenoreactivity of T cells to tumor sites so that damages to normal tissues are minimized and severe GvH diseases are avoided.
This disclosure describes a method of generating genetically modified T cells with alloreactivities or xenoreactivities restricted to tumor sites or tissues with blood cancer cell accumulation. The method comprises abrogating the ability of T cells to activate through TCR and introducing a mechanism that restores the ability at the tumor sites in response to molecular cues enriched on tumor cells or in the tumor microenvironment. This disclosure further describes the genetically modified T cells made and therapeutic uses thereof.
The disclosure describes the methods of generating tumor-activated alloreactive or xenoreactive T cells and their use in treating patients with cancer. The T cells are generated in four main steps (
The first step is T cell collection. T cells are isolated from the blood of an HLA mismatched donor. The degree of HLA mismatch is determined by comparing the alleles of the donor and the recipient at the HLA-A, HLA-B, HLA-C, DRB1, DPA1, DPB1, DQA1 and DQB1 loci. Donors with at least one HLA allele mismatched with that of the recipient or patient are selected. Preferably the mismatch allele is at one of the HLA-A, HLA-B, HLA-C, DRB1 loci. Donors with mismatches at higher numbers of loci are preferred for strong T cell alloreactivities. Xenogeneic T cells are isolated from an animal such as a pig. Total T cells as a mixture of CD4+ and CD8+ T cells, CD4+ T cells alone, or CD8+ T cells alone, can be isolated from the donor's blood using conventional methods known in the art or by using commercially available kits using purification columns or magnetic beads.
The second step is stimulation, which activates the T cells and drives them to proliferate (i.e., drive the cells into cell cycle). This step aids genetic manipulation of the T cells in the following steps and expands the T cells. T cells can be stimulated nonspecifically or specifically. For nonspecific stimulation, T cells can be cultured with anti-CD3 and antibody and anti-CD28 antibodies coated on beads or plastic surfaces to activate all T cells regardless of their alloreactivity or xenoreactivity. For specific stimulation, T cells can be co-cultured with cells from the patient, including peripheral blood mononuclear cells (PBMCs), cultured monocyte-derived dendritic cells (DCs), and cells isolated from resected tumors. Alternatively, T cells can be cultured with PBMCs or DCs from another donor who shares at least one common HLA allele with the patient. Alloreactive T cells proliferate in response to PBMC from an HLA-mismatched individual as a result of T cell stimulation by antigen presenting cells (APCs) in PBMCs though TCR-HLA interaction. This is the basis for mixed lymphocyte reaction (MLR), which has been used to determine the alloreactivity of T cells since 1964) (33). To expand alloreactive T cells for the current disclosure, T cells from an HLA-mismatched donor can be labeled with the cell division tracking fluorescent dye carboxyfluorescein succinimidyl ester (CFSE) and cultured with PBMCs from the patient. Prior to the culture, the patient PBMCs are treated with irradiation (2,500 rads) or chemotherapy drugs, such as mitomycin C to abrogate their proliferation potential. Proliferated donor T cells with low CFSE levels are sorted using flow cytometry and used as the source of alloreactive T cells for downstream genetic manipulations. The efficiency of alloreactive T cell expansion can be increased by using DCs. As professional antigen presenting cells (APCs), DCs express high levels of HLA-I, HLA-II and a host of costimulatory molecules such as CD40, CD80 and CD86. T cells expanded by DCs may also strongly activate T cells through engaging TCR and costimulatory receptors such as CD28. Monocyte-derived DCs (MoDCs) have been tested for immunotherapies against cancer, autoimmune and other disease for decades. As of August 2019, 120 human clinical trials were listed on ClinicalTrials.gov. MoDCs have been shown to efficiently stimulate the expansion of alloreactive T cells (34-36). Generation of MoDCs involves culturing enriched monocytes from an apheresis collection of PBMCs in the presence of granulocyte-macrophage colony-stimulation factor (GM-CSF) and interleukin-4 (IL-4) (34-42). The processes of enriching monocyte, generating and cryopreserving MoDCs are well established (43, 44) and a number of commercial kits are available for generating clinical grade MoDCs. To enhance the ability of T cells to recognize and kill tumor cells, T cells may be stimulated by MoDCs in the presence of lysate generated with tumor cells from the patient or with a tumor cell line derived from a tumor of the same type from another individual (45-47).
T cells can also be expanded by culturing with cell lines that express HLA proteins encoded by at least one of the patient's HLA alleles or artificial surfaces such as plastics that are coated with HLA proteins encoded by at least one of the patient's HLA alleles. Specific stimulation leads to selective activation and expansion of T cells that are alloreactive or xenoreactive to patient HLAs. Stimulated and expanded T cells can be cryo-preserved, for instance in DMSO at a suitable percentage, such as 10% DMSO or 7.5% DMSO, and thawed later for downstream genetic manipulations. The activation step may be omitted if genetic manipulations in the following steps can be achieved without T cell activation and T cell activation and expansion after infusion into the patients are preferred.
The third step is to abrogate the ability of T cells to activate through TCR signaling, thus making the T cells activation-incompetent. This is achieved through disrupting the expression or function of at least one molecule that is necessary for TCR signaling and T cell activation (
The fourth step is to generate tumor-activated alloreactive or xenoreactive T cells by equipping the activation-incompetent T cells with the ability to restore activation competency at tumor sites (
The expression cassette comprises DNA sequences of a promoter-like transcriptional control element (TCE) operably linked to a DNA sequence encoding a copy of the disrupted gene (
Two types of engineered receptors can be employed as tumor-sensing receptors. The first type releases a transcription activator from the intracellular domain upon ligand binding. The transcription activator then translocates to the nucleus where it activates the expression cassette. These receptors include, by way of example, synthetic Notch (SynNotch) (14, 55) and (US patent publication US20160264665A1 and U.S. Pat. No. 9,834,608B2), Modular Extracellular Sensor Architecture (MESA) (56) (US patent publication US20140234851A1), and Tango (57). A SynNotch receptor exploits the ability of Notch to, upon ligand binding, cleaves and release its intracellular domain, which acts as a transcription factor after translocating to the nucleus. A SynNotch receptor is constructed by replacing the extracellular recognition domain of the Notch with a binding domain for a specific target and replacing intracellular domain with a transcription activator that can bind to the TCE in the expression cassette and drive the expression of gene of interest. DNA constructs for the patented SynNotch receptors with the Gal4-VP64 transcription activator and extracellular binders for CD19 (Addgene Cat. #79125) and Her2 (Addgene Cat. #85424) can be readily modified to construct SynNotch receptors with other binding specificities and/or transcription activators. DNA construct for the patented expression cassette with the Gal4-VP64 TCE is also available from Addgene (Cat. #79123) and can be used to for expression of gene of interest in response to SynNotch activation. A CD3ε expression cassette (Gal4-CD3-PKG-BFP) with an additional BFP coding sequence controlled by a constitutively active PGK-1 promoter is shown in SEQ ID NO: 1. Since SynNotch activation relies on surface-anchored ligands, it can be used to sense tumor antigens expressed on tumor cell surfaces such as Her2.
MESA can be used to sense soluble factors in the tumor microenvironment such as vascular endothelial growth factor (VEGF) or soluble tumor antigen shed from tumor cells. Target binding leads to receptor dimerization, which brings a protease on the intracellular domain of one monomer close to its substrate sequence on the other monomer. Cleavage of the substrate sequence leads to the release of a transcription activator linked to the cytosolic domain of the second monomer though the substrate sequence.
Tango is similar to MESA except that the protease is linked to an intracellular signaling molecule that is recruited to the receptor intracellular domain upon ligand binding. Therefore, Tango can be used to sense a variety of soluble factors in the tumor microenvironment, including chemokines (53), growth factors, and growth hormone (54).
The second type of engineered tumor sensing receptors activates an endogenous transcription factor in T cells through signaling pathways. For example, a typical CAR with intracellular Immunoreceptor tyrosine-based activation motif (ITAM) domains can, in response to ligand binding, initiate multiple signaling pathways that lead to the activation of transcription factors NFAT, AP-1, NFκB/Rel, or NR4A1 (Nur77) (
DNA sequences for the tumor-sensing receptor and the expression cassette will be introduced into T cells using retroviral or lentiviral vectors, or transposon vectors such as Sleeping Beauty (Addgene) and piggyBac (VectorBuilder), to facilitate their stable integration into the T cell genome. In practice, step three and step four can be carried out at the same time or in reverse order. T cells non-specifically or specifically stimulated may be restimulated. T cells may be cryopreserved after stimulation/expansion, after step 3, or after step 4. The tumor-activated alloreactive T cells can therefore be generated in a number of ways. Three examples are: (i) stimulation/expansion→SynNotch and expression cassette introduction→CD3ε KO→(cryopreservation)→treatment; (ii) stimulation/expansion→cryopreservation→restimulation→SynNotch and expression cassette introduction→CD3ε KO→(cryopreservation)→treatment; and (iii) stimulation/expansion→CD3ε KO→cryopreservation→restimulation with PMA and ionomycin→SynNotch and expression cassette introduction→(cryopreservation)→treatment.
The present disclosure provides a tumor-activated alloreactive or xenoreactive T-cell. The T-cell originates from a healthy donor for whom the genotype of at least one of the HLA-A, B, C and DRB1 loci is known to mismatch that of the patient. The T cell is modified to be activation-incompetent. Specifically, the T cell is genetically modified to disrupt expression of at least one endogenous gene encoding a molecule that is critical for TCR signaling and T cell activation. The gene to be disrupted can encode a transmembrane protein expressed on the plasma membrane. Non-limiting examples of exemplary transmembrane proteins include CD3ε, CD3ζ, CD3γ, CD3δ, CD4, CD8α, CD8β, LAT, TRIM, CD45, CD28, LFA-1, CD2, CD54, CD52, CD148, and CD58. The gene to be disrupted can encode an intracellular signaling molecule involved in TCR signaling and T cell activation. Non-limiting examples of exemplary intracellular signaling molecules include Lck, Zap70, calcineurin, PI3K, Fyn, PLCγ, SLP76, PKCθ, AKT, NcK and PDK1.
The activation-incompetent T cell further comprises an expression cassette comprising a copy of the gene encoding the molecule disrupted in the T cell. The expression vector comprises a transcriptional control element (TCE) operably linked to the gene, wherein binding of a cognate transcription activator to TCE results in expression of the gene encoding the molecule disrupted in the T cell. The T cell further comprises an exogenous tumor-sensing receptor. Binding of the tumor-sensing receptor to its cognate tumor antigen results in the release or activation of a transcriptional activator. A tumor antigen, as used herein, can be a tumor cell surface molecule, such as Her2, or a soluble factor present in a tumor microenvironment, such as vascular endothelial growth factor (VEGF), or a tumor antigen that is shed from tumor cells. In an alternative embodiment, the tumor-sensing receptor recognizes molecules enriched in tissues with accumulation of blood cancer cells. These include molecules expressed on hematopoietic cells that are abundant in bone marrow and lymphoid organs,
The genetically modified T cell comprising the above-described features are contemplated to provide at least one of the following beneficial properties of confined alloreactivity at tumor sites or tissues with blood cancer cell accumulation and being able to target both tumor cells and tumor stromal cells that express HLA.
In certain embodiments of the tumor-activated alloreactive or xenoreactive T-cell and the method of making the same, the endogenous gene disrupted is selected from CD3ε, CD3ζ, CD3γ, CD3δ and CD8α. In an embodiment, the endogenous gene disrupted is CD3ε.
In certain embodiments, the target molecule is selected from Her2/neu, EGFRvIII, CD19, IL-13RR-a2, mesothelin, MUCI, EpCAM, GD2 and CEA. In certain embodiments, target molecule is selected from Her2/neu, EGFRvIII, CD19, IL-13RR-a2, mesothelin, and MUCI. In certain embodiments, the target molecule is selected from Her2/neu, EGFRvIII, and CD19. In an embodiment, the target molecule is Her2/neu. In an embodiment, the target molecule is CD19.
In certain embodiments, the expression cassette is selected from Gal4-CD3-PGK-BFP, NR4A-CD3-PKG-BFP, and NFAT-CD3-PKG-BFP. In certain embodiments, the tumor sensing receptor and expression cassette are selected from SynNotch and Gal4-CD3-PGK-BFP, CAR and NR4A-CD3-PKG-BFP, and CAR and NFAT-CD3-PKG-BFP.
In certain aspects, the sample of T cells is from a donor individual, and wherein the donor individual has at least one HLA allele mismatch relative to an intended recipient and the at least one HLA allele mismatch is located in a locus selected from the group consisting of: HLA-A, HLA-B, HLA-C, HLA-DRB1, HLA-DQA1, HLA-DQB1, HLA-DPA1 and HLA-DPB1, thereby producing tumor-activated alloreactive T cells. In certain embodiments, the at least one HLA allele mismatch is located in a locus selected from the group consisting of: HLA-A, HLA-B, HLA-C, and HLA-DRB1. In certain embodiments, the HLA allele mismatch comprises four alleles of, HLA-A, HLA-B, HLA-C, and HLA-DRB1, six alleles of, HLA-A, HLA-B, HLA-C, and HLA-DRB1 or all eight alleles of HLA-A, HLA-B, HLA-C, and HLA-DRB1. In an embodiment, the HLA allele mismatch comprises all eight alleles of HLA-A, HLA-B, HLA-C, and HLA-DRB1.
In certain embodiments, the endogenous gene disrupted is CD3c, the target molecule is selected from Her2/neu, EGFRvIII, and CD19, and the tumor sensing receptor is SynNotch.
In certain embodiments, the endogenous gene disrupted is CD3c, the target molecule is selected from Her2/neu, EGFRvIII, and CD19, the tumor sensing receptor is SynNotch, and the expression cassette is Gal4-CD3-PGK-BFP. In an embodiment, the endogenous gene disrupted is CD3c, the target molecule is Her2/neu, the tumor sensing receptor is SynNotch, and the expression cassette is Gal4-CD3-PGK-BFP. In an embodiment, the endogenous gene disrupted is CD3c, the target molecule is CD19, the tumor sensing receptor is SynNotch, and the expression cassette is Gal4-CD3-PGK-BFP. In an embodiment, the endogenous gene disrupted is CD3c, the target molecule is Her2/neu, the tumor sensing receptor is CAR, and the expression cassette is NFAT-CD3-PGK-BFP.
Tumor-activated alloreactive or xenoreactive T cells will be expanded in culture supplemented with cytokines such as IL-2 and IL-7. The T cells will be introduced to patients or cryo-preserved for later use. T cells from different donors or stimulations may be used for the same patient to achieve the best results.
A number of additional steps may be taken to reduce HvG and enhance T cell survival in the patient. First, the patient may be conditioned with lympho-depleting radiation or chemotherapy agent prior to infusion to suppress the immune system.
Second, T cells may be obtained from donors with partially matched HLAs to reduce HvG. For example, T cells from a donor with a 5/8 match of the HLA-A, B, C, and DRB1 loci may be stimulated with patient cells or cell lines expressing the patient's alleles at the three mismatched loci to expand T cells that are alloreactive to these alleles. Third, T cells may be additionally modified to become “stealthy” to the patient's immune system. For example, the expression of HLA-A, B or C on T cells may be disrupted using CRISPR-Cas9. It should be noted that only the mismatched HLA gene(s) needs to be disrupted. Alternatively, the expression of all HLA-I molecules on cell surfaces may be abrogated by knocking out the shared β2M component, which is required for HLA-I to reach plasma membrane. This will be followed by introducing the a chain of HLA-E or HLA-G that is fused with β2M in step four (25). HLA-E and HLA-G are non-classical HLA molecules that are not involved in alloreactions but can inhibit attacks from natural killer (NK) cells. Finally, for a patient with blood cancer and have received allogeneic hematopoietic stem cell transplantation, T cells may be obtained from the stem cell donor. In this case, the T cells will be tolerated by the patient's immune system. Moreover, in this case, T cells with restored alloreactivity will target only the patient's cells including cancer cells but avoid hematopoietic cells derived from the donor stem cells.
In the patient, due to deficiencies in critical components for TCR signaling, tumor-activated alloreactive or xenoreactive T cells cannot react to HLAs in normal tissues and should not cause GvH diseases. After migrating into tumors or tissues with blood cancer cell accumulation, however, engagement of tumor-sensing receptors by cue molecules enriched on in the tumor or target tissues will restore the T cells' alloreactivity or xenoreactivity, leading to T cell killing of HLA-expressing tumor cells and stromal cells (
The potency and specificity of tumor-activated alloreactive or xenoreactive T cells can be optimized in a number of ways. First, the potency of the cells may be controlled by selecting the level of HLA-mismatch between the donor and patient. For example, mismatches at all six HLA-I loci are expected to elicit stronger alloreaction than mismatch at only one.
Second, the ability of T cells to selectively target tumors and avoid normal tissues may be optimized by tuning the sensitivity of tumor-sensing receptors so that signals are generated only in response to high levels of tumor cue molecules. This may be achieved by adjusting the expression level, affinity, and extracellular linker length of the receptors.
Third, tumor selectivity of the T cells may be further controlled by using two tumor-sensing receptors, one releasing the DNA-binding domain of the transcription activator and another one releasing the activation domain of the transcription activator. This way, only cells expressing both tumor antigens can restore the expression of the key molecule, thus the reactivity of the T cells. Alternatively, tumor selectivity may be controlled by using multiple tumor-sensing receptors each directing the expression of a distinct component critical for TCR signaling. For instance, both CD3ζ and CD3ε may be knocked out and two tumor-sensing receptors will be introduced: one recognizes Her2 and directs the expression of CD3ζ; another recognizes a different tumor antigen MUC1 and directs the expression of CD3ε. Since both CD3ζ and CD3ε are required for cell surface expression of the TCR/CD3 complex, only cells expressing both tumor antigens can activate the T cells.
Fourth, the balance between tumor cell killing and normal tissue damage may be tweaked by adjusting the duration of alloreactivity. This can be achieved by manipulating the stability of mRNA transcripts for the re-expressed key molecule or by using degrons (65) to control its rate of protein degradation. The balance may also be adjusted by enhancing or reducing T cell survival through controlling the degree of lympho-depletion in the patient, thus the HvG activity against the allogeneic or xenogeneic T cells. Finally, the potency and specificity of tumor-activated alloreactive or xenoreactive T cells may be controlled by using a “universal” tumor-sensing receptor with an extracellular domain that binds to a peptide or chemical tag on a tumor antigen-binding soluble factor or with an extracellular domain derived from an Fc receptor that binds to tumor antigen-specific IgA, IgG or IgE antibodies. The tumor-sensing receptor will be activated by the soluble factor or the antibodies bound on tumor cells. The level of alloreactivity or xenoreactivity of the T cells can be manipulated by controlling the type and dose of the tumor-binding soluble factor or antibody.
Tumor-activated alloreactive or xenoreactive T cells are believed to have a number of advantages over CAR T cells in terms of efficacy and cost. First, once activated at the tumor site, allogenic T cells attack not only tumor cells expressing the tumor antigen, but also other tumor cells expressing HLA-I. Even though HLA-I downregulation is a common mechanism employed by tumor cells to escape immune surveillance, HLA-I expression is well preserved in many cancers. For example, 68% in gastric cancer (66), 57% in esophageal cancer (67), 45% in osteosarcoma (68), 34% in breast cancer (69), and 30% in lung cancer (70).
Second, alloreactive or xenoreactive T cells also attack HLA-I-expressing stromal cells such as carcinoma-associated fibroblasts, angiogenic vascular cells (71) and myeloid-derived suppressor cells (72) that play important roles in supporting tumor growth and in creating an immunosuppressive tumor microenvironment. Stromal cells have been found to strongly and uniformly express HLA-I even when tumor cells are HLA-negative (73-75). These two features make it possible to use tumor-activated alloreactive or xenoreactive T cells to treat tumors with a low percentage of tumor antigen-expressing cells that may be considered unsuitable for CAR T cells. In this sense, tumor antigen-expressing cells not only serve as targets, but also designate the whole tumor for attacks by therapeutic T cells.
Third, since the sources of T cells are healthy donors, tumor-activated alloreactive T cells that recognize certain popular HLA alleles or haplotypes may be produced in large quantities, cryo-preserved and offered as off-the-shelf products. T cell products with alloreactivities to each of the patient's HLA alleles can be selected, combined and administered for treatment. This will lower cost and enable repeated administration for better efficacy.
Taken together, tumor-activated alloreactive or xenoreactive T cells have the potential to be more effective for a broader range of tumors than CAR T cells.
The T cells are administered to a subject in need of treatment for a cellular proliferative disorder, including but not limited to, cancer. The T cells may be administered either alone, or as a pharmaceutical composition in combination with one or more pharmaceutically acceptable carriers, diluents or excipients and/or with other components, such as cytokines or other cell populations. Such compositions may comprise pharmaceutically acceptable buffers such as neutral buffered saline, phosphate buffered saline and the like; pharmaceutically acceptable carbohydrates such as glucose, mannose, sucrose or dextrans, mannitol; proteins; polypeptides or amino acids such as glycine; pharmaceutically acceptable antioxidants; pharmaceutically acceptable chelating agents such as EDTA or glutathione; pharmaceutically acceptable adjuvants (e.g., aluminum hydroxide); and pharmaceutically acceptable preservatives. Compositions are preferably formulated for intravenous administration.
Cancers that may be treated or prevented according to the present disclosure include a broad range of tumor types, including but not limited to: ovarian cancer, cervical cancer, breast cancer, prostate cancer, testicular cancer, lung cancer, renal cancer, colorectal cancer, skin cancer, brain cancer, and tumors that may arise from hematological malignancies such as leukemias, including acute myeloid leukemia (AML), chronic myeloid leukemia (CIVIL), acute lymphoid leukemia and chronic lymphoid leukemia. More particularly, cancers that may be treated by the compounds, compositions and methods of the disclosure include, but are not limited to, the following: cardiac cancers, lung cancers, gastrointestinal cancers, genitourinary tract cancers, liver cancers, bone cancers, nervous system cancers, gynecological cancers, hematologic cancers, skin cancers, and adrenal gland cancers.
Cancers may comprise solid tumors that may or may not be metastatic. Cancers may also occur as a diffuse tissue. Thus, the term “tumor cell,” as provided herein, includes a cell afflicted by any one of the above identified disorders.
The T cells or pharmaceutical composition thereof may be administered by a route that results in the effective delivery of an effective amount of cells to the patient for pharmacological effect. Administration is typically parenteral. Intravenous administration is the preferred route, using infusion techniques that are commonly known in immunotherapy (see, e.g., Rosenberg et al., New Eng. J. Med. 319: 1676, 1988). The quantity of T cells and frequency of administration are determined by such factors as the condition of the patient, and the type and severity of the patient's disease, although appropriate dosages may be determined by clinical trials. An “effective amount” is determined by a physician with consideration of individual differences in age, weight, disease state, and disease severity of the patient. Generally, the amount of T cells given in a single dosage will range from about 106 to 109 cells/kg body weight, including all integer values within those ranges. The T cells may be administered multiple times at these dosages. The optimal dosage and treatment regime for a particular patient can readily be determined by one skilled in the art of medicine by monitoring the patient for signs of disease and adjusting the treatment accordingly.
The T cells or composition comprising the T cells compositions may be provided in a pharmaceutical pack or kit comprising one or more containers or compartments filled with one or more compositions. Optionally associated with such container(s) is a notice in the form prescribed by a governmental agency regulating the manufacture, use or sale of pharmaceuticals or biological products, which notice reflects approval by the agency of manufacture, use or sale for human administration. Also optionally included with such container(s) are instructions for carrying out the methods of the disclosure.
The instructional material may comprise a publication, a recording, a diagram, or any other medium of expression which can be used to communicate the usefulness of the method. The package insert may comprise text housed in any physical medium, e.g., paper, cardboard, film, or may be housed in an electronic medium such as a diskette, chip, memory stick or other electronic storage form. The instructional material of the kit of the disclosure may, for example, be affixed to a container which contains other contents of the kit, or be shipped together with a container which contains the kit. Alternatively, the instructional material may be shipped separately from the container with the intention that the instructional material and the contents of the kit be used cooperatively by the recipient.
Among the embodiments provided herein are:
Embodiment 1. A method for producing tumor-activated alloreactive or xenoreactive T cells, said method comprising:
wherein step c) is performed before step d), step d) is performed before step c), or steps c) and d) are performed at the same time, and
wherein binding of the recombinant receptor with the target molecule restores the expression or function of the abrogated molecule, and thereby restores the ability of the T cells to activate through antigen recognition by TCR,
thereby producing tumor-activated alloreactive or xenoreactive T cells.
Embodiment 2. The method of Embodiment 1, wherein step b) is not performed.
Embodiment 3. The method of Embodiment 1, wherein step b) is performed.
Embodiment 4. The method of any one of Embodiments 1 to 3, wherein step d) is carried out before step c).
Embodiment 5. The method of any one of Embodiments 1 to 3, wherein step c) is carried out before step d).
Embodiment 6. The method of any one of Embodiments 1 to 4, wherein steps c) and d) are performed at the same time.
Embodiment 7. The method of any one of Embodiments 4 to 6, wherein the T cell stimulation step comprises culturing donor T cells with antibodies specific for CD3 and CD28.
Embodiment 8. The method of any one of Embodiments 1 to 7, wherein the sample of T cells is from a donor individual, and wherein the donor individual has at least one HLA allele mismatch relative to an intended recipient and the at least one HLA allele mismatch is located in a locus selected from the group consisting of: HLA-A, HLA-B, HLA-C, HLA-DRB1, HLA-DQA1, HLA-DQB1, HLA-DPA1 and HLA-DPB1, thereby producing tumor-activated alloreactive T cells.
Embodiment 9. The method of any one of Embodiments 1-8, wherein step b) comprises co-culturing donor T cells with cells from an intended recipient.
Embodiment 10. The method of Embodiment 9, where the cells from the intended recipient are peripheral blood mononuclear cells, dendritic cells, tumor cells, or a mixture of thereof.
Embodiment 11. The method of Embodiment 9 and 10, where donor T cells are co-cultured with dendritic cells pulsed with lysate of tumor cells isolated from the patient or pulsed with the lysate of a tumor cell line derived from a tumor of the same type from a different individual.
Embodiment 12. The method of any one of Embodiments 1-8, wherein step b) comprises co-culturing donor T cells with cells from a second donor that (i) has at least one HLA allele matched with the intended recipient, and (ii) is mismatched with the T cell donor.
Embodiment 13. The method of Embodiment 12, where the cells from the second donor are peripheral blood mononuclear cells, dendritic cells, tumor cells, or a mixture of thereof.
Embodiment 14. The method of any one of Embodiments 1-8, wherein step b) comprises co-culturing donor T cells with a cell line expressing a least one HLA allele of the intended recipient.
Embodiment 15. The method of any one of Embodiments 9 to 14, the cells co-cultured with the donor T cells are treated with radiation or chemicals to block cell proliferation. Embodiment 16. The method of any one of Embodiments 1-8, wherein step b) comprises co-culturing donor T cells with an artificial surface.
Embodiment 17. The method of Embodiment 16, wherein the artificial surface is a plastic coated with at least one protein encoded by at least one HLA allele of the intended recipient.
Embodiment 18. The method of any one of Embodiments 1 to 17, wherein step c) comprises abrogating the expression of at least one protein critical for TCR signaling and T cell activation by disrupting the gene encoding the protein.
Embodiment 19. The method of Embodiment 18, wherein disrupting the gene uses a gene editing technology chosen from CRISPR-Cas, a transcription activator-like effector nuclease (TALEN), megaTALS, a zinc-finger nuclease, or a homing endonuclease.
Embodiment 20. The method of any one of Embodiments 1 to 19, wherein the at least one molecule necessary for TCR signaling and T cell activation is a cell surface molecule chosen from CD3ε, CD3ζ, CD3γ, CD3δ, CD4, CD8α, CD8β, LAT, TRIM, CD45, CD28, LFA-1, CD2, CD54, CD52, CD148, and CD58.
Embodiment 21. The method of any one of Embodiments 1 to 19, wherein the at least one molecule necessary for TCR signaling and T cell activation is an intracellular signaling molecule chosen from Lck, Zap70, calcineurin, PI3K, Fyn, PLCγ, NFAT, SLP76, PKCθ, NFκB, AKT, and PDK1.
Embodiment 22. The method of any one Embodiments 1 to 21, wherein the activation-incompetent T cells of step c) are purified by first staining the cells using antibodies specific for the surface molecules, and then isolating the cells lacking antibody binding by flow cytometry, magnetic beads, and/or purification columns.
Embodiment 23. The method of any one Embodiments 1 to 21, wherein the activation-incompetent T cells of step c) are purified by using a live cell-specific DNA imaging technique.
Embodiment 24. The method of Embodiment 23, wherein the live cell-specific DNA imaging technique is CRISPR LiveFish.
Embodiment 25. The method of any one of Embodiments 1 to 21, wherein the activation-incompetent T cells of step c) are purified by selecting T cells unable to activate and proliferate after further stimulation through TCR.
Embodiment 26. The method of any one of Embodiments 1 to 25, wherein step d) comprises introducing a nucleic acid encoding a tumor-sensing receptor into T cells using, for instance, lentiviral vectors, retroviral vectors, or transposon vectors such as Sleeping Beauty and piggyBac.
Embodiment 27. The method of Embodiment 26, wherein the tumor-sensing receptor comprises (i) an extracellular domain that binds directly or indirectly to a target molecule enriched on or in at least one of tumor cells, tumor microenvironment, and tissues with blood cancer cell accumulation; and (ii) an intracellular domain that activates or releases a transcription activator in response to extracellular domain binding to the target molecule.
Embodiment 28. The method of any one of Embodiments 1 to 27, wherein the target molecule is enriched on tumor cells and/or in the tumor microenvironment and is chosen from CD19, CD20, CD38, CD30, Her2/neu, ERBB2, CA125, MUC-1, prostate-specific membrane antigen (PSMA), CD44 surface adhesion molecule, mesothelin, carcinoembryonic antigen (CEA), epidermal growth factor receptor (EGFR), EGFRvIII, vascular endothelial growth factor receptor-2 (VEGFR2), high molecular weight-melanoma associated antigen (HMW-MAA), MAGE-A1, IL-13R-a2, GD2, 4-1BB, 5T4, adenocarcinoma antigen, alpha-fetoprotein, BAFF, B-lymphoma cell, C242 antigen, CA-125, carbonic anhydrase 9 (CA-IX), C-MET, CCR4, CD152, CD19, CD20, CD200, CD22, CD221, CD23 (IgE receptor), CD28, CD30 (TNFRSF8), CD33, CD4, CD40, CD44 v6, CD51, CD52, CD56, CD74, CD80, CEA, CNT0888, CTLA-4, DRS, EGFR, EpCAM, FAP, fibronectin extra domain-B, folate receptor 1, GD2, GD3 ganglioside, glycoprotein 75, GPNMB, HGF, human scatter factor receptor kinase, IGF-1 receptor, IGF-I, IgG1, Ll-CAM, IL-13, IL-6, insulin-like growth factor I receptor, integrin αvβ3, MORAb-009, MS4A1, MUC1, mucin CanAg, N-glycolylneuraminic acid, NPC-IC, PDGF-Ra, PDL192, phosphatidylserine, prostatic carcinoma cells, RANKL, RON, ROR1, SCH 900105, SDC1, SLAMF7, TAG-72, tenascin C, TGF beta 2, TGF-β, TRAIL-R1, TRAIL-R2, tumor antigen CTAA16.88, VEGF-A, VEGFR-1, VEGFR2, mesothelin, NKG2D, CD147, NKR2, B7H3, and vimentin.
Embodiment 29. The method of any one of Embodiments 1 to 27, wherein the target molecule is enriched in a tissue with blood cancer cell accumulation, and wherein the tissue is lymphoid and/or bone marrow tissue.
Embodiment 30. The method of Embodiment 29, wherein the target molecule is chosen from CD45, CD19, CD20, CD4, CD8, CD2, CCR4, CD58, CD28, CD23, CD69, CD25, CD33, CD123 and CCL-1.
Embodiment 31. The method of any one of Embodiments 27 to 30, wherein the extracellular domain of the tumor-sensing receptor is a single chain variable fragment (scFv), a Fab fragment, a designed ankyrin repeat protein (DARPin), a TCR, a nanobody, a Fc receptor, a growth factor receptor, a chemokine receptor, or a hormone receptor.
Embodiment 32. The method of any one of Embodiments 27 to 30, wherein the tumor-sensing receptor is a version of the Synthetic Notch (SynNotch), Modular Extracellular Sensor Architecture (MESA), or Tango technology, wherein a transcription activator is released from the intracellular domain of the receptor in response to extracellular domain binding to the target molecule.
Embodiment 33. The method of any one of Embodiments 27 to 30, wherein the tumor-sensing receptor is a chimeric antigen receptor, wherein a downstream transcription factor is activated through signaling pathways activated in response to extracellular domain binding to the target molecule.
Embodiment 34. The method of any one of Embodiments 26 to 33, the nucleic acid comprises an expression cassette comprising a transcription control element operably linked to a DNA sequence encoding a functional copy of the at least one molecule necessary for TCR signaling and T cell activation abrogated in step c), wherein binding of a transcription activator activates and/or releases from the tumor-sensing receptor to the transcription control element activates transcription of the encoded functional copy of the at least one molecule necessary for TCR signaling and T cell activation.
Embodiment 35. The method of Embodiment 34, wherein the transcription control element is bound by a transcription activator selected from the group consisting of Gal4-VP64, Notch, tet transactivator, NFAT, AP-1, NFκB/Rel, NR4A1 (Nur77), T-Bet, IRF4, STATs and eomesodermin (Eomes).
Embodiment 36. The method of any one of Embodiments 1 to 35, wherein the potency and specificity of the tumor-activated alloreactive or xenoreactive T cells are regulated by controlling the affinity, specificity and expression level of tumor-sensing receptors or controlling the mRNA or protein stability of the critical molecule for T cell activation.
Embodiment 37. The method of any one of Embodiments 1 to 36, further comprising modifying the T cells to reduce the potential of being detected and eliminated through HvG by the patient's immune system.
Embodiment 38. The method of Embodiment 37, wherein modifying the T cells comprises abrogating T cell expression of HLA alleles mismatched with the recipient by disrupting the genes encoding HLA class I a heavy chain.
Embodiment 39. The method of Embodiment 38, wherein disrupting the genes encoding the HLA class I α heavy chain uses a gene editing technology chosen from CRISPR-Cas, a transcription activator-like effector nuclease (TALEN), megaTALS, a zinc-finger nuclease, or a homing endonuclease.
Embodiment 40. The method of Embodiment 37, wherein modifying the T cells comprises abrogating T cell expression of all HLA class Ion cell surface by disrupting the genes encoding beta-2-microglobulin ((32M) thereby.
Embodiment 41. The method of Embodiment 40, wherein disrupting the genes encoding beta-2-microglobulin uses a gene editing technology chosen from CRISPR-Cas, a transcription activator-like effector nuclease (TALEN), megaTALS, a zinc-finger nuclease, or a homing endonuclease, and further comprising introduction of HLA-G or HLA-E a chain fused with β2M using a non-viral or viral vector.
Embodiment 42. The method of any one of Embodiments 1 to 41, further comprising cryopreserving the tumor-activated T cells for later use.
Embodiment 43. A method of treating cancer in a patient by administering T cells prepared by the method of any one of Embodiments 1 to 42.
Embodiment 44. The method of Embodiment 43, wherein T cells generated from different donors or using different stimulations are administered to the same patient.
Embodiment 45. The method of Embodiment 43 or Embodiment 44, wherein prior to the administration of the T cells, the patient is conditioned with IFNγ (interferon gamma) to upregulate the expression of HLA on tumor cells and stromal cells.
Embodiment 46. The method of Embodiment 43 or Embodiment 44, wherein prior to the administration of the T cells, the patient is conditioned with lympho-depleting radiation or chemotherapy agent to suppress the immune system.
Embodiment 47. A genetically modified T cell (or a population thereof) comprising:
The invention is further described in detail by reference to the following experimental examples. These examples are provided for purposes of illustration only, and are not intended to be limiting unless otherwise specified. Thus, the invention should in no way be construed as being limited to the following examples, but rather, should be construed to encompass any and all variations which become evident as a result of the teaching provided herein.
The cytotoxicity of alloreactive T cells to U266 myeloma cells was determined as followed. T cells from a healthy donor were activated with anti-CD3/CD28 beads for 72 hrs and expanded for additional 5 days in medium supplemented with 100 U/ml recombinant human IL2. 2.5×105 T cells were incubated with 2.5×104 U266 cells expressing luciferase at a 10:1 ratio for 16 hrs in the absence or presence of 10 μg/ml CD8-specific monoclonal antibody SK1. Luciferase activities in the remaining live U266-luciferase cells were determined using the Bright-Glo™ luciferase assay system (Promega, Madison, Wis.). The luciferase activities of 2.5×104 U266-luciferase cells cultured without T cells were determined as the maximum activity. Specific killing was calculated as {1−(sample activity)/(max activity)}×100.
The data are shown in
The experiment was carried out as follows. CD3ζ is required for the assembly and cell surface expression of TCR/CD3 complex, which also consists of TCRα, TCRβ, CD3γ and CD3ε chains. Guide RNA (gRNA) designed to target the extracellular domain of mouse CD3ζ was synthesized using a GeneArt™ Precision gRNA Synthesis Kit (Invitrogen). The gRNA and Cas9 ribonucleoproteins (RNPs) were introduced into D10 cells using an electroporation-based Neon Transfection System (Invitrogen). Cells were stained with antibodies specific for TCRβ and CD3ε and analyzed using flow cytometry.
The data are shown in
Five hundred thousand (500,000) purified primary human CD8+ T cells were cultured with human T-activator CD3/CD28 Dynabeads (Life Technologies) at a 1:1 cell to bead ratio in a 48-well plate. The cells were cultured in OpTmizer culture medium (Thermo Fisher; CTS™ OpTmizer™ T cell Expansion SFM, 6 mM GlutaMAX™, and 2% CTS™ Immune Cell SR) supplemented with 10 ng/ml recombinant human IL2 (rhlL-2; R&D Systems). Beads were removed after 3 days of stimulation.
The T cells were maintained at 0.5×106/ml to 2×106/ml with change of medium and rhIL2 every 1 to 2 days.
The human breast cancer cell line MDA-MB-231 (ATCC) expresses relatively high levels of HLA-I (A02:17; A02:01; B41:01; B40:02; C17:01; C02:02) (79). (
To specifically stimulate and expand alloreactive T cells, 0.125×106 MDA-MB-231 cells were seeded in a 48 well plate and cultured overnight. 0.75×106 purified primary human CD8 T cells from a donor with mismatched HLA-I (A 34:02, A 68:02; B 07:02, B 57:03; C 07:01, C 07:02) were added and cultured in OpTmizer™ (Thermo Fisher Scientific) culture medium supplemented with 10 ng/ml rhIL-2 and 1 μg/ml Ultra-LEAF™ purified anti-CD28 monoclonal antibody (Biolegend, clone CD28.2). After 5 days of culture, T cells were moved to a flask and cultured at a density of 0.5×106 to 2×106 cells/ml.
The data are shown in
Lentiviral vectors for anti-CD19 SynNotch were packaged using the transfer vector pHR_PGK_antiCD19_synNotch_Gal4VP64 (Addgene Cat. #79125). The vector drives the expression of anti-CD19 SynNotch receptor downstream of a constitutively active PGK-1 promoter. The anti-CD19 SynNotch receptor comprises a N-terminal MycTag followed by a CD19-specific extracellular single chain variable fragment (scFv), a Notch core sequence including the transmembrane domain, and an intracellular domain containing a cleavable artificial transcription activator Gal4-VP64, which consists of a Gal4 DNA binding domain and a VP64 transcription activation domain (14, 55).
To prepare lentiviral vectors for the CD3ε expression cassette, the transfer vector pHR_Gal4UAS_IRES_mC_pGK_tBFP (Addgene #79123) (14, 55) was modified by inserting a human CD3ε coding sequence downstream the Gal4 binding sites and removing the IRES-mCherry sequence. The human CD3ε coding sequence was codon optimized so that the target-specific sequence of the gRNA for CD3ε knockout no longer functions through recognizing the CD3ε coding sequence in the cassette and working with Cas9 to cleave it. The resulting transfer vector encodes a Gal4-CD3-PKG-BFP cassette (SEQ ID NO: 1) in which CD3ε expression is controlled by the Gal4 binding sequence and the expression of blue fluorescence protein (BFP) is driven by a constitutively active PGK-1 promotor (
Lentiviral vectors were packaged in Lenti-X 293T cells (Takara) and concentrated 100-fold using the Lentivirus Precipitation Solution (ALSTEM). To transduce T cells, 50 μl concentrated lentiviral vectors each for anti-CD19 SynNotch and Gal4-CD3-PKG-BFP cassette were added to T cells stimulated by anti-CD3/CD28 beads or MDA-MB-231 cells at day 1 post stimulation. After 24 hours of incubation in the presence of 10 μg/ml protamine, media were changed to dilute protamine sulfate and 10 ng/ml rhIL-2 was added. For co-culture with MDA-MB-231 cells, anti-human CD28 antibody (Biolegend, clone CD28.2) was added to 1 μg/ml. Anti-CD19 synNotch expression was analyzed by staining with PE-conjugated anti-MycTag (Cell Signaling Technology, clone 9B11). The presence of CD3ε expression cassette in T cells was marked by the expression of BFP.
As shown in
To knock out CD3ε expression, 4 to 5 days after stimulation with anti-CD3/CD28 beads or MDA-MB-231 cells, primary human CD8+ T cells were electroporated using the Neon Transfection System (ThermoFisher). Specifically, ribonucleoprotein (RNP) was formed by incubating 7.5 pmol of hCD3ε Alt-R CRISPR-Cas9 single guide RNA (sgRNA, IDT # Hs.Cas9.CD3E.1.AC, crRNA sequence: 5′-agggcaugtcaauauuacug-3′; SEQ ID NO: 16) and 7.5 pmol of Alt-R S.p Cas9 Nuclease V3 (IDT) in 5 μl Buffer R for 15 mins. The RNP was then mixed with 0.2×106 T cells in Buffer R, loaded into a 10 μl tip and electroporated using the program #24 (1600 v, 10 ms, 3 pulses). As shown in
To determine whether the lack of CD3ε expression impacts the T cells' proliferation potential, CD3ε knockout was performed as described above but without removing CD3+ T cells and the mixed WT and CD3-KO T cells were cultured for 25 days.
As shown in
To determine the cytotoxicity of alloreactive T cells and the impact of CD3 knockout, T cells from an HLA-mismatched donor (A29:02, A30:01; B35:01, B53:01; C04:01) were stimulated with MDA-MB-231 cells and electroporated to knock out CD3ε as in EXAMPLE 6. Wild type (WT; intact CD3c) or purified CD3KO cells were co-cultured with MDA-MB-231 cells expressing firefly luciferase (MDA-MB-231-luci) at a 3:1 ratio for 6 hrs. MDA-MB-231-luci cells cultured alone were used as controls. The luciferase activities of the cultures were determined using the Bright-Glo reagent (Promega) and read on a Victor plate reader (PerkinElmer). The percentages of specific % killing were calculated as 100×[1−(luciferase activity of sample/luciferase activity of control)].
As shown
To generate CD3-KO T cells expressing anti-CD19 SynNotch and Gal4-CD3-PKG-BFP cassette (CD3KO-19SN-εCS T cells), primary human CD8+ T cells were stimulated with MDA-MB-231 cells, transduced with lentiviral vectors encoding the anti-CD19 SynNotch and Gal4-CD3-PKG-BFP cassette, electroporated to knockout CD3c, and CD3-negative T cells were purified as described in EXAMPLES 4, 5 and 6. To test the cells' ability to restore CD3 expression and react to anti-CD3 stimulation, 200,000 CD3KO-19SN-εCS T cells were stimulated for 16 hours with 80,000 WT MDA-MB-231 cells or MDA-MB-231 cells expressing human CD19 (
The data are shown in
To determine the cytotoxicity of alloreactive CD3KO-19SN-εCS T cells against target cells expressing CD19, primary CD8+ T cells from a donor with HLA-I (A11:01, A30:02; B18:01, B51:01; C05:01, C15:02) mismatched with MDA-MB-231 cells were stimulated with MDA-MB-231 cells, transduced and electroporated to knock out CD3ε as described in EXAMPLES 4, 5 and 6. The cells were sorted and CD3ε−BFP+MycTag+ cells were collected as CD3KO-19SN-εCS T cell. T cells were cultured with either MDA-MB-231 expressing firefly luciferase (MDA-MB-231-luci) or MDA-MB-231-CD19 expressing firefly luciferase (MDA-MB-231-CD19-luci) at a 1.5:1 ratio for 16 hrs. MDA-MB-231-luci and MDA-MB-231-CD19-luci cultured alone were used as respective controls. The luciferase activities of the cultures were determined using the Bright-Glo reagent (Promega) and read on a Victor plate reader (PerkinElmer). The percentages of specific % killing were calculated as 100×[1−(luciferase activity of sample/luciferase activity of control)].
As shown
Based on a previously published protocol (80), peripheral blood mononuclear cells (PBMCs) will be isolated from a patient leukapheresis using density-gradient centrifugation over Ficoll-Paque (MP Biomedicals, Aurora, Ohio, USA) and washed in OpTmizer™ culture medium (Thermo Fisher Scientific). To generate MoDCs, PBMCs from the patient will be resuspended in culture medium at a final concentration of 3 to 5×106 cells/mL and incubated in a standard tissue culture flask for 2 hours at 37° C. in a 5% CO2-containing atmosphere. Nonadherent cells will be removed by vigorous pipetting. The remaining adherent cells will be cultured in medium supplemented with 200 ng/mL recombinant human GM-CSF (R&D Systems, Minneapolis, Minn., USA) and 4 ng/mL recombinant human interleukin IL-4 (R&D Systems). Fresh cytokines will be added every 2 to 3 days. For the maturation of DCs, culture medium will be replaced on day 6, and 1100 U/mL recombinant human TNF-α (R&D Systems) is added for 24 hours. The PBMCs and DCs will be irradiated (2500 rads) using a RS2000 irradiator (Radsource) prior to co-culture with T cells. T cells will be purified from the PBMCs of an HLA-mismatched donor using an EasySep human T cell enrichment kit (StemCell Technologies). The T cells will be labeled with 2.5 μM CFSE in labeling buffer (DPBS with 5% FBS) for 5 mins at room temperature and washed with labeling buffer three times. To stimulate and expand alloreactive T cells, CFSE-labeled T cells will be mixed with either PBMCs or matured DCs at a 1:1 ratio and cultured for 4 days in the presence of 10 ng/ml rh IL2 (R&D Systems). The cells will be harvested, stained with anti-CD3-APC and sorted for the CD3+CFSElow w population. The cells will be further expanded in culture, used for downstream genetic manipulations immediately, or cryopreserved for future use.
To study the efficacy and toxicity of tumor activated alloreactive T cells for tumors in vivo, MDA-MB-231 cells will be used to form subcutaneous tumors in severely immunocompromised NSG™ mice (JAX®). To mimic the heterogeneity of TAA expression in tumor tissues, the tumors will be formed with a mixture of MDA-MB-231 expressing firefly luciferase and tumor antigen Her2 and MDA-MB-231 cells expressing luciferase only at varying ratios. Tumor development will be monitored by imaging the luciferase activity of the tumors using a IVIS Lumina LT imager (PerkinElmer). After the tumors become detectable, the mice will be treated with tumor activated alloreactive T cells (CD3KO-Her2SN-εCS T cells), conventional Her2-specific 2nd generation CAR T cells, anti-CD4/CD28 beads-activated but unmodified T cells or left untreated. Tumor activated alloreactive T cells will be prepared using primary human T cells from a donor with HLA-I that mismatches the HLA-I of MDA-MB-231 cells. The T cells will be stimulated with MDA-MB-231 cells, transduced with lentiviral vectors encoding Her2-specific SynNotch and Gal4-CD3-PKG-BFP cassette, and electroporated to knock out CD3ε as described in EXAMPLES 4, 5 and 6. The T cells will be administered through i.v. (intravenous) injection and their efficacy in controlling tumor growth will be monitored by imaging the tumor luciferase activities over time and by comparing the survival curves of each treatment. The CD3KO-Her2SN-εCS T cells are predicted to be the most effective in controlling tumor growth, followed by conventional Her2-specific 2nd generation CAR T cells, and followed by anti-CD3/CD28 beads-activated but unmodified T cells. To monitor GvH side effects caused by the therapeutic T cells, non-tumor tissues from the skin, liver, lung and heart will be examined for T cell infiltration using immunohistochemistry. The GvH side effects will also be compared by treating NSG mice without tumors with tumor activated alloreactive T cells, conventional Her2-specific 2nd generation CAR T cells, anti-CD3/CD28 beads-activated but unmodified T cells or left untreated. Weight loss and survival will be monitored and the levels of serum inflammatory cytokine including INFγ, IL2, IL-12, IL-17, IL5 and TNF-α will be monitored and compared. Mice treated with CD3KO-Her2SN-εCS T cells are predicated to display lower levels of GvH than mice treated with conventional Her2-specific 2nd generation CAR T cells or anti-CD3/CD28 beads-activated but unmodified T cells.
Based on a previously published protocols (34-42), to generate MoDCs, peripheral blood mononuclear cells (PBMCs) isolated from an HLA-A2+ healthy donor using density-gradient centrifugation over Ficoll-Paque (MP Biomedicals, Aurora, Ohio, USA) were culture in AIM V serum-free medium (Thermo Fisher) in a tissue culture dish at the density of 106/cm2 for 2 hours at 37° C. in a humidified atmosphere of 5% CO2. Non-adherent cells were removed by washing with warm DPBS without calcium chloride and without magnesium chloride three times. The adherent cells were cultured in AIM V medium supplemented with 100 ng/mL recombinant human GM-CSF (Peprotech) and 100 ng/ml recombinant human IL-4 (Peprotech) for 3 days and the medium was replaced with fresh AIM V medium with the same concentrations of GM-CSF and IL-4. The cells were cultured for another 2 days and loosely adherent or non-adherent immature DCs were harvested and transferred to another dish and cultured at a concentration of 1×106 cells/ml in AIM V medium supplemented with 100 ng/ml recombinant human GM-CSF and 100 ng/ml recombinant human IL-4. The next day, maturation cocktail was added to the final concentrations of 10 ng/ml TNF-α (Peprotech), 10 ng/ml IL-1β (Peprotech), 10 ng/ml IL-6 (Peprotech), and 1 μg/ml PGE2 (Sigma). In addition, MDA-MB-231 tumor cells lysate was added to DCs at a ratio of 3 tumor cell equivalents to 1 MoDC. To prepare tumor cell lysate, MDA-MB-231 cells were heat-shocked by incubating at 42° C. for 25 minutes (45-47). Cells were harvested, washed with phosphate-buffered saline (PBS), and resuspended in DPBS at 1×107 cells/ml, before 5 cycles of freezing and thawing (ethanol with dry ice and 56° C.). Solid debris was then spun down at 1700 g for 5 minutes and the supernatant was collected to be used as tumor cell lysate immediately or stored at −80° C.
Two days after the addition of maturation cocktail and tumor cell lysate, the mature MoDCs were analyzed for the expression of surface markers CD14, CD83 and CD86 by flow cytometry. As shown in
To determine the ability of tumor lysate-pulsed mature MoDCs to expand alloreactive T cells, MoDCs as described in Example 12 were cultured with carboxyfluorescein diacetate succinimidyl ester (CFSE)-pulsed T cells from an HLA-A2− donor at a 1:3 ratio for 9 days. Significant T cell proliferation was observed (
To determine the ability of the expanded alloreactive T cells to kill HLA-A2+ MDA-MB-231 tumor cells, the T cells were cultured with MDA-MB-231 cells expressing luciferase (MDA-luci) or HLA-I− MDA-MB-231 cells (β2m knocked out which results in the loss of HLA-I surface expression) expressing luciferase (MDA-β2m-KO-luci) at a 3:1 ratio for 16 hrs. The MDA-β2m-KO-luci cells were generated by transducing MDA-MB-231 β2m KO cells (
As shown in
To knock out CD3γ, CDδ, CD3ζ or CD8α expression in human T cells, primary human CD8+ T cells were stimulated with anti-CD3/CD28 beads for 4 to 5 days, and then were electroporated using the Neon Transfection System (ThermoFisher) to prepare four different populations each with a single knock out. Specifically, ribonucleoprotein (RNP) was formed by incubating 7.5 pmol of single guide RNA (sgRNA) and 7.5 pmol of Alt-R S.p Cas9 Nuclease V3 (IDT) in 5 μl Buffer R for 15 mins. The crRNA sequences of the sgRNA sequences used are: for CD3γ, Hs.Cas9.CD3G.1.AH (5′-GUAAUGCCAAGGACCCUCGA-3′; SEQ ID NO: 17); for CDδ, Hs.Cas9.CD3D.1.AB (5′-CCCCUUCAAGAUACCUAUAG-3′; SEQ ID NO: 18); for CD3ζ, Hs.Cas9.CD247.1.AC (5′-GAUGGAAUCCUCUUCAUCUA-3′; SEQ ID NO: 19); and for CD8α, Hs.Cas9.CD8A.1.AA (5′-GCUGCUGUCCAACCCGACGU-3′; SEQ ID NO: 20). The RNP was then mixed with 0.2×106 T cells in Buffer R, loaded into a 10 μl tip and electroporated using the program #24 (1600 v, 10 ms, 3 pulses).
As shown in
To determine the ability of CD3KO-195N-εCS T cells to kill CD19− target cells in the presence of CD19+ target cells, CD3KO-195N-εCS T cells were generated as described in Example 16 except that lentiviral vectors encoding CD19-specific SynNotch, rather than lentiviral vectors encoding Her2-specific SynNotch, were used. Briefly, primary CD8+ T cells from a donor with HLA-I (A11:01, A30:02; B18:01, B51:01; C05:01, C15:02) mismatched with MDA-MB-231 cells were stimulated with MDA-MB-231 cells, transduced and electroporated to knock out CD3ε as described in EXAMPLES 4, 5, and 6. The cells were sorted and CD3ε−BFP+MycTag+ cells were collected as CD3KO-19SN-εCS T cell. To prepare target cells for trans killing, MDA-MB-231 cells or MDA-MB-231 cells expressing CD19 (MDA-MB231-CD19) (
As shown in
The transfer vector pHR_PGK_antiHer24D5-8_synNotch_Gal4VP64 (Addgene Cat. #85425) was used to package lentiviral vectors for Her2-specific SynNotch. The expression of Her2-specific SynNotch receptor was driven by a constitutively active PGK-1 promoter. The Her2-specific SynNotch receptor comprises a N-terminal MycTag followed by a Her2-specific extracellular single chain variable fragment (scFv), a Notch core sequence including the transmembrane domain, and an intracellular domain containing a cleavable artificial transcription activator Gal4-VP64, which consists of a Gal4 DNA binding domain and a VP64 transcription activation domain (14, 55).
To prepare lentiviral vectors for the CD3ε expression cassette, the transfer vector pHR_Gal4UAS_IRES_mC_pGK_tBFP (Addgene #79123) (14, 55) was modified by inserting a human CD3ε coding sequence downstream the Gal4 binding sites and removing the IRES-mCherry sequence. The human CD3ε coding sequence was codon optimized so that the target-specific sequence of the gRNA for CD3ε knockout no longer functions through recognizing the CD3ε coding sequence in the cassette and working with Cas9 to cleave it. The resulting transfer vector encodes a Gal4-CD3-PKG-BFP cassette (SEQ ID NO: 1) in which CD3c expression is controlled by the Gal4 binding sequence and the expression of blue fluorescence protein (BFP) is driven by a constitutively active PGK-1 promotor (
The following steps were used to generate tumor-activated alloreactive T cells based on Her-specific SynNotch, Step 1) T cell activation. On Day 0, 0.75×106 purified primary human CD8+ T cells from a healthy donor with HLA-I (A11:01, A30:02; B18:01, B51:01; C05:01, C15:02) mismatched with MDA-MB-231 cells were co-cultured with 0.125×106 MDA-MB-231 cells in a 48 well plate in OpTmizer™ culture medium supplemented with 10 ng/ml rhIL-2 and 1 μg/ml Ultra-LEAF™ purified anti-CD28 monoclonal antibody (Biolegend, clone CD28.2). Step 2) Transduction. On Day 1, 50 μl concentrated lentiviral vectors each for Her2-specific SynNotch and Gal4-CD3-PKG-BFP cassette were added to the co-culture. Protamine sulfate was also added to the concentration of 10 μg/ml. On day 2, medium was replaced with fresh medium containing 10 ng/ml rhIL-2 and 1 μg/ml anti-human CD28 antibody to dilute protamine sulfate. On Day 5, the expanded T cells were transferred to a 6-well plate at a concentration of 106/ml. Step 3) CD3ε knock out. On Day 6, the T cells were electroporated using the Neon Transfection System (ThermoFisher) to introduce CD3c-targeting sgRNA and Cas9 as described in Example 6. Step 4) Analysis and purification of CD3KO-Her2SN-εCS T cells. On Day 9, the cells were harvested and stained with anti-CD3c antibody for CD3 expression and anti-MycTag (Cell Signaling Technology, clone 9B 11) for SynNotch expression. The presence of CD3ε expression cassette in T cells was marked by the expression of BFP. CD3−MycTag+BFP+ cells were sorted as CD3KO-Her2SN-εCS T cells.
As shown in
To test the ability of CD3KO-Her2SN-εCS T cells to restore CD3 expression and react to anti-CD3 stimulation, 200,000 CD3KO-Her2SN-εCS T cells generated as described in Example 16 were stimulated for 16 hours with 80,000 MDA-MB-231 with the low levels of intrinsic Her2 expression knocked out (MDA-HerKO) or MDA-MB-231 cells transduced to express Her2 at high levels (MDA-Her2) (
The data are shown in
To determine the cytotoxicity of alloreactive CD3KO-Her2SN-εCS T cells to Her2+ target cells, CD3KO-Her2SN-εCS T cells generated as described in Example 16 were cultured with MDA-MB-231 cells expressing firefly luciferase and Her2 (MDA-luci-Her2) (
As shown
To determine the ability of CD3KO-Her2SN-εCS T cells to kill Her2− target cells in the presence of Her2+ target cells, three types of MDA-MB-231 cells were used as target cells: Her2− MDA-luci-Her2KO, Her2− MDA-Her2KO, and Her2+ MDA-Her2 (
As shown in
Lentiviral vectors for Her2-specific CAR were packaged using the transfer vector z368-EF1a-4D5-2gCAR. The vector encodes a Her2-specific second generation CAR (SEQ ID NO: 22) driven by an EF1α promoter. The Her2-specific CAR comprises an N-terminal 4D5 scFv followed by a CD8a linker, a transmembrane domain, a 4-1BB signaling domain and a CD3ζ signaling domain with three ITAMs.
To prepare lentiviral vectors for the NFAT-driven CD3ε expression cassette, the transfer vector pHR_Gal4UAS_IRES_mC_pGK_tBFP (Addgene #79123) (14, 55) was modified by inserting a human CD3ε coding sequence downstream the Gal4 binding sites, removing the IRES-mCherry sequence and then replacing the five Gal4 binding sequences and the minimal promoter with four NFAT (4xNFAT) binding sequences followed by a synthetic minimal promoter. The human CD3ε coding sequence was codon optimized so that the target-specific sequence of the gRNA for CD3ε knockout no longer functions through recognizing the CD3ε coding sequence in the cassette and working with Cas9 to cleave it. The resulting transfer vector encodes a 4xNFAT-CD3-PKG-BFP cassette (SEQ ID NO: 23) in which CD3c expression is controlled by the 4xNFAT binding sequence and the expression of blue fluorescence protein (BFP) is driven by a constitutively active PGK-1 promotor (
The following steps were used to generate tumor-activated alloreactive T cells based on Her-specific CAR, Step 1) T cell activation. On Day 0, 0.75×106 purified primary human CD8+ T cells from a healthy donor with HLA-I (A11:01, A30:02; B18:01, B51:01; C05:01, C15:02) mismatched with MDA-MB-231 cells were co-cultured with 0.125×106 MDA-MB-231 cells in a 48 well pate in OpTmizer™ culture medium supplemented with 10 ng/ml rhIL-2 and 1 μg/ml Ultra-LEAF™ purified anti-CD28 monoclonal antibody (Biolegend, clone CD28.2). Step 2) Transduction. On Day 1, 50 μl concentrated lentiviral vectors each for Her2-specific CAR and 4xNFAT-CD3-PKG-BFP cassette were added to the co-culture. Protamine sulfate was also added to the concentration of 10 μg/ml. On day 2, the medium was replaced with fresh media containing 10 ng/ml rhIL-2 and 1 μg/ml anti-human CD28 antibody to dilute protamine sulfate. On Day 5, the expanded T cells were transferred to a 6-well plate at a concentration of 106/m. Step 3) CD3ε knock out. On Day 6, the T cells were electroporated using the Neon Transfection System (ThermoFisher) to introduce CD3c-targeting sgRNA and Cas9 as described in Example 6. Step 4) Analysis and purification of CD3KO-Her2CAR-εCS T cells. on Day 9, the cells were harvested and stained with anti-CD3ε antibody for CD3 expression. The cells were also stained with recombinant human Her2 followed by anti-Her2/CD340 antibody (Biolegend) for the expression of Her2-specific CAR. The presence of NFAT-driven CD3ε expression cassette in T cells was marked by the expression of BFP. CD3− CAR+BFP+ cells were sorted as CD3KO-Her2CAR-εCS T cells.
As shown in
To test the ability of CD3KO-Her2CAR-εCS T cells to restore CD3 expression and react to anti-CD3 stimulation, 200,000 CD3KO-Her2CAR-εCS T cells generated as described in Example 20 were stimulated for 16 hours with 80,000 MDA-MB-231 with the low levels of intrinsic Her2 expression knocked out (MDA-HerKO) or MDA-MB-231 cells transduced to express Her2 at high levels (MDA-Her2) (
Xenograft mouse tumor models will be used to determine the ability of tumor-activated alloreactive T cells to suppress the growth of tumors with homogenous and heterogeneous tumor antigen expressions. To evaluate potential normal tissue damages by tumor-activated alloreactive T cells, we will establish the models using MDA-MB-231 cells in NSG-HLA-A2/HHD mice (Jax, #014570), which are highly immunodeficient NSG mice expressing human HLA-A02 in addition to mouse MHC class I and class II molecules (81, 82). MD-MB-231 cells form rapidly growing tumors in NSG mice (83) and the xenograft models have been widely used for testing T cell therapies against cancers (84-86). It has been shown that the expression of HLA-A02 enhances GvHD caused by transplanted HLA-A02-human T cells due to the combined alloreactivity and xenoreactivity (87). The models therefore serve as a sensitive platform to investigate the potential normal tissue damages and GvHDs caused by tumor-activated alloreactive T cells, which are generated using T cells from HLA-A02− donors to target HLA-A02+ MDA-MB-231 cells. CD3KO-Her2CAR-εCS and CD3KO-Her2SN-εCS tumor-activated alloreactive T cells generated through MDA-MB-231 stimulation or MoDC stimulation as described in Examples 16 and 20 will be tested.
1) Determine the ability of tumor-activated alloreactive T cells to suppress the growth of tumors with homogenous tumor antigen expression. To establish the xenograft mouse models, a group of NSG-HLA-A2/HHD mice will be injected subcutaneously into the right flank with 5×106 Her2+ MDA-luci-Her2 cells. At day 7 after injection, 1×106 tumor-activated alloreactive T cells will be administered via tail vein injection. As negative controls, a group of mice will be treated with T cells activated with anti-CD3/CD28 beads (ThermoFisher) from the same donor for tumor-activated alloreactive T cells. To confirm that tumor suppression is due to the alloreactivities of tumor-activated alloreactive T cells, mice with tumors established using Her2+HLA− MDA-β2m-KO-luci cells will be treated. Tumor progression will be evaluated weekly by measuring the size of the tumor with a caliper and by measuring luminescence emission on a Lumina LT IVIS in vivo imaging system (Perkin Elmer) after intraperitoneal injection of d-luciferin (GoldBio). The survival of the mice will be recorded over time for Kalan-Meier survival analysis.
2) Determine the ability of tumor-activated alloreactive T cells to suppress the growth of tumors with heterogenous tumor antigen expression and compare tumor-activated alloreactive T cells with CAR T cells for efficacy. Tumors will be established in NSG-HLA-A2/HHD mice using Her2+ NIDA-MB-231 cells and Her2− MDA-luci-Her2KO cells mixed at 10:1, 1:1 and 1:10 ratios. Two groups of mice will be each treated with tumor-activated alloreactive T cells or the Her2-specific CAR T cells and tumor progression and mouse survival will be analyzed.
3) Determine the degree of normal tissue damage and GvHDs in mice treated with tumor-activated alloreactive T cells. A group of tumor-free NSG-HLA-A2/HHD mice and a group of NSG-HLA-A2/HHD mice carrying Her2+ MDA-MB-231 tumors will be treated with tumor-activated alloreactive T cells as described above and monitored for GVHD over 6 months. As positive controls, the mice will be treated with expanded but unmanipulated alloreactive T cells or expanded alloreactive T cells expressing Her2-specific CARs. All tumor-activated alloreactive T cells, unmanipulated alloreactive T cells and CAR T cells will be generated with T cells from the same HLA-A02− donor. The severity of GVHD will be assessed three times a week by a scoring system that incorporates four clinical parameters: weight loss>10% of initial weight, hunching posture, skin lesions, dull fur, and diarrhea (88). Each of the five parameters will be scored 0 (if absent) or 1 (if present). Mice will be sacrificed in case of weight loss>30% of initial weight or upon reaching the maximal clinical grade (i.e., 5/5). In addition, histology analyses will be carried out on small and large bowel, liver, and skin samples of dead or sacrifice mice. Six parameters will be scored for small and large bowel and seven parameters for the liver as described by Cooke et al. (89). Three parameters will be scored for the skin according as described by Ferrara et al. (90). The presence of tumor-activated alloreactive T cells or CAR T cells in these tissues will also be recorded based on BFP expression and anti-CD3 staining, respectively.
The disclosures of each and every patent, patent application, and publication cited herein are hereby incorporated herein by reference in their entirety.
Although the present embodiments have been described in detail with reference to examples above, it is understood that various modifications can be made without departing from the spirit of these embodiments, and would readily be known to the skilled artisan. The appended Embodiments are intended to be construed to include all such embodiments and equivalent variations.
This application is a continuation-in-part of International Application No. PCT/US2021/040765, filed Jul. 7, 2021, which claims the benefit of the filing date of U.S. Provisional Patent Application No. 63/048,881, filed Jul. 7, 2020, each of which is hereby incorporated in its entirety for all purposes.
| Number | Date | Country | |
|---|---|---|---|
| 63048881 | Jul 2020 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | PCT/US2021/040765 | Jul 2021 | US |
| Child | 17574483 | US |
