WO2017159736A1 - 免疫機能制御因子を発現する免疫担当細胞及び発現ベクター - Google Patents
免疫機能制御因子を発現する免疫担当細胞及び発現ベクター Download PDFInfo
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Definitions
- the present invention relates to an immunocompetent cell that expresses a cell surface molecule specifically recognizing a cancer antigen, interleukin 7 (IL-7), and CCL19, an anticancer agent containing such an immunocompetent cell, and such
- the present invention relates to an expression vector for producing immunocompetent cells.
- Cancer is a disease with many affected persons all over the world, and in general, chemotherapy, radiation therapy, or surgical treatment is widely performed. However, there are various problems such as side effects, loss of some functions, and difficulty in treating metastases.
- immune cell therapy is a therapy in which immunocompetent cells are collected from a patient, treated and amplified so as to enhance the immune function of the immunocompetent cells, and transferred to the patient again.
- a therapy see Non-Patent Document 1 is known in which T cells are collected from a patient, a gene encoding CAR is introduced into the T cells, amplified, and transferred again to the patient.
- This therapy is currently undergoing clinical trials around the world, and results showing effectiveness in hematopoietic malignancies such as leukemia and lymphoma have been obtained.
- interleukin 7 is a cytokine essential for the survival of T cells, and is known to be produced by non-hematopoietic cells such as bone marrow, thymus, and stromal cells of lymphoid organs / tissues.
- IL-7 interleukin 7
- a T cell utilizing the function of IL-7 a T cell expressing a chimeric cytokine receptor fused with IL-7 and IL-7Ralpha (see Patent Document 1) is disclosed.
- the chimeric cytokine receptor in such T cells is expressed as a single fusion protein limited to the membrane surface of the introduced T cells, and cytokines such as IL-7R are ligand-independent only for the own cells. It was only a signal transmitter, and the function of T cells into which the receptor was not introduced could not be enhanced.
- Non-Patent Document 2 shows an action on non-activated T cells that are constantly present in the T cell region of the secondary lymphoid tissue, and are directly related to the anti-tumor immune response. It did not indicate.
- the CCL19, CCL21, and IL-7 expressing cells in Non-Patent Documents 2 and 3 were not T cells but reticuloendothelial cells present in secondary lymphoid tissues.
- TCR T cell receptor
- TCR tumor antigens expressed in cancer cells
- a pharmaceutical composition for treating meningiomas containing cells expressing TCR that specifically recognizes WT1-expressing cells is disclosed.
- an object of the present invention is to produce an immunocompetent cell that expresses an immune function regulator of the immunocompetent cell in the immunocompetent cell, and has both proliferation ability, viability, and T cell accumulation ability, and such an immunocompetent cell.
- An object of the present invention is to provide an expression vector for an immune function regulator.
- the inventors have attempted to improve cells that express immune function regulators for the purpose of achieving a better immune induction effect and antitumor activity in cancer immunotherapy using immunocompetent cells.
- cytokines, chemokines, and signal control proteins which are factors that control the immune function of immunocompetent cells
- a vector that expresses the factors that control the immune function of the immunocompetent cells was constructed.
- an expression vector was introduced into an immunocompetent cell, it was found that an immunocompetent cell having an immune induction effect, proliferation ability, viability, and T cell accumulation ability superior to that of a conventional immunocompetent cell could be produced.
- the present invention has been completed.
- the present invention is as disclosed in the following (1) to (9).
- An immunocompetent cell that expresses a cell surface molecule that specifically recognizes a cancer antigen, interleukin 7 (IL-7), and CCL19.
- the cancer antigen is WT1, MART-1, NY-ESO-1, MAGE-A1, MAGE-A3, MAGE-A4, Glypican-3, KIF20A, Survivin, AFP-1, gp100, MUC1, PAP- 10, PAP-5, TRP2-1, SART-1, VEGFR1, VEGFR2, NEIL3, MPHOSPH1, DEPDC1, FOXM1, CDH3, TTK, TOMM34, URLC10, KOC1, UBE2T, TOPK, ECT2, MESOTHELIN, NKG2D1
- the immunocompetent cell according to any one of (1) to (3) above, which is GM2.
- a nucleic acid encoding a cell surface molecule that specifically recognizes and a nucleic acid encoding CCL19, Are linked via a self-cleaving peptide, the expression vector as described in (5) or (6) above.
- IL-7 and CCL19 (hereinafter also referred to as “IL-7 ⁇ CCL19-expressing immunocompetent cell”), It becomes possible to suppress a decrease in the survival rate due to a tumor formed by a cancer cell having tumor activity and having an antigen specifically recognized by a cell surface molecule. Further, by using the expression vector of the present invention, it becomes possible to produce immunocompetent cells having both proliferation ability, viability and T cell accumulation ability.
- the IL-7 ⁇ CCL19-expressing immunocompetent cell of the present invention is not particularly limited as long as it expresses a cell surface molecule specifically recognizing a cancer antigen, interleukin 7 (IL-7), and CCL19.
- Other immune function control factors such as M-CSF, TGF-beta, and TNF-alpha may be expressed.
- a cancer antigen refers to a substance such as a protein or glycolipid that is expressed higher in cancer cells than normal cells or specifically expressed in cancer cells.
- cancer antigens include tumor-related antigens and Examples include cancer testis antigens, angiogenesis-related antigens, and epitope peptides of tumorigenic antigens (neoantigens) due to gene mutations.
- Cell surface molecules that specifically recognize cancer antigens include cell surface receptors that specifically recognize cancer antigens, artificial receptors, and adhesion factors, and specifically recognize cancer antigens.
- a molecule that imparts specific discrimination ability to cancer by being expressed on the cell surface such as a chimeric antigen receptor (CAR) that specifically recognizes a T cell receptor or a cancer antigen.
- CAR chimeric antigen receptor
- TCR can be mentioned more suitably.
- TCR as long as it specifically recognizes a cancer antigen, either a heterodimer consisting of an alpha chain and a beta chain (alpha / beta TCR) or a heterodimer consisting of a gamma chain and a delta chain (gamma / delta TCR) Good.
- the cell surface molecule that specifically recognizes the cancer antigen may be indirectly recognized as long as the cancer antigen is specifically recognized.
- a molecule such as an antibody that specifically recognizes a cancer antigen is administered to a subject simultaneously or sequentially with the immunocompetent cell of the present invention, and the molecule such as the antibody is recognized, or the molecule such as an antibody is labeled.
- the immunocompetent cell of the present invention can indirectly specifically recognize the cancer antigen.
- examples of the case of recognizing an antibody include CD16 as a cell surface molecule, and examples of a tag for labeling a molecule such as an antibody include FITC.
- the type of immunocompetent cell in the IL-7 ⁇ CCL19-expressing immunocompetent cell of the present invention may be any cell that is involved in the immune response, such as T cells, natural killer cells (NK cells), and B cells.
- T cells such as T cells, natural killer cells (NK cells), and B cells.
- NK cells natural killer cells
- B cells include cells, antigen-presenting cells such as monocytes, macrophages, dendritic cells, and granulocytes such as neutrophils, eosinophils, basophils, mast cells, humans, dogs, cats, pigs,
- T cells derived from mammals such as mice, preferably human T cells.
- T cells are isolated from body cells such as blood and bone marrow fluid, immune cells that infiltrate tissues such as spleen, thymus, and lymph nodes, or cancer tissues such as primary tumors, metastatic tumors, and cancerous ascites. It can be obtained by purification, or can be obtained from ES cells or iPS cells. Examples of such T cells include alpha / beta T cells, gamma delta T cells, CD8 + T cells, CD4 + T cells, tumor infiltrating T cells, memory T cells, naive T cells, and NKT cells.
- Examples of the method for preparing the IL-7 ⁇ CCL19-expressing immunocompetent cell of the present invention include a method of preparing the immunocompetent cell by introducing the expression vector of the present invention described later. Alternatively, after introducing a cell surface molecule that specifically recognizes a cancer antigen, interleukin 7 (IL-7), and / or a vector expressing CCL19 into fertilized eggs, ES cells, or iPS cells. If necessary, cancer antigens can be added to the immunocompetent cells obtained by inducing and preparing cells from the transgenic mammals that have expressed cell surface molecules that specifically recognize cancer antigens by gene transfer. A method of introducing a vector expressing a cell surface molecule that specifically recognizes, interleukin 7 (IL-7), and / or CCL19 can also be mentioned.
- IL-7 interleukin 7
- a method for preparing the expression vector of the present invention described later by introducing it into the immunocompetent cells is not particularly limited, but known methods such as virus infection method, calcium phosphate method, lipofection method, microinjection method, electroporation method and the like.
- a method of introduction by a method can be mentioned, and a method of introduction by a virus infection method can be preferably mentioned.
- the expression vector of the present invention and the packaging plasmid are GP2-293 cells (manufactured by Takara Bio Inc.), Plat-GP cells (manufactured by Cosmo Bio), PG13 cells (ATCCRLCRL-10686), PA317 cells.
- GP2-293 cells manufactured by Takara Bio Inc.
- Plat-GP cells manufactured by Cosmo Bio
- PG13 cells ATCCRLCRL-10686
- PA317 cells PA317 cells.
- Retrovirus packagin Kit Eco manufactured by Takara Bio Inc. You may carry out using commercially available kits, such as.
- the immunocompetent cell of the present invention is a cell surface molecule that specifically recognizes a cancer antigen, a polynucleotide containing a nucleotide sequence encoding IL-7, and CCL19, using a known gene editing technique. It may be produced by integrating into the genome of a cell so that it can be expressed under the control of a proper reporter.
- Known gene editing techniques include techniques using endonucleases such as zinc finger nuclease, TALEN (transcriptional activation-like effector nuclease), CRISPR (Clustered Regularly Interspaced Short Palindromic Repeat) -Cas system.
- a gene editing technique is used to express a polynucleotide containing a base sequence encoding another foreign protein under the control of an appropriate reporter. It may be integrated into the cell's genome as possible. Methods for integrating a polynucleotide into the cell genome so that it can be expressed under the control of an appropriate reporter include cell surface molecules that specifically recognize cancer antigens, IL-7, and CCL19 (or other proteins).
- a polynucleotide operably linked downstream of an appropriate promoter that is, a polynucleotide ligated with a coding sequence so that it can be expressed under the control of the promoter
- an appropriate promoter that is, a polynucleotide ligated with a coding sequence so that it can be expressed under the control of the promoter
- a method for incorporating a polynucleotide comprising a base sequence encoding a cell surface molecule specifically recognizing a cancer antigen, IL-7, and CCL19 (or other protein) downstream of an endogenous promoter in the cell genome Etc.
- the endogenous promoter include TCR ⁇ and TCR ⁇ promoters.
- herpes simplex virus thymidine kinase (HSV-TK) and inducible caspase 9 described later may be expressed in the IL-7 ⁇ CCL19-expressing immunocompetent cells of the present invention.
- IL-7 ⁇ CCL19-expressing immunocompetent cells of the present invention express cell surface molecules specifically recognizing cancer antigens, IL-7 and CCL19, proliferative ability, viability, and endogenous T cell It has a high accumulation ability and can be applied to adoptive immunotherapy using various immunocompetent cells.
- adoptive immunotherapy include, but are not limited to, dendritic cell therapy, NK cell therapy, gamma delta T cell therapy, alpha / beta T cell therapy, CTL therapy, TIL therapy and the like.
- Examples include a method in which an expression vector of the present invention described later is introduced into an immunocompetent cell collected from a patient, amplified, and administered to the patient. Although a specific example is given below, it is not limited to this.
- the dendritic cell therapy includes a step of incorporating a cancer tissue or its lysate excised by surgery into a dendritic cell differentiated from monocytes collected from a patient and administering it to the patient's body.
- the expression vector of the present invention May be included in the dendritic cell.
- an epitope peptide of a cancer antigen molecule can be artificially synthesized and used in place of the cancer tissue or lysate.
- the NK cell therapy includes a step of activating NK cells with a plurality of stimulating substances such as IL-2, proliferating the lymphocytes collected from the patient, and administering the lymphocytes to the patient.
- the step of introducing the vector of the present invention into the NK cells. May be included.
- the gamma delta T cell therapy includes a step of culturing and stimulating lymphocytes collected from a patient using IL-2 or zoledronic acid to proliferate and administer gamma delta T cells to the patient.
- a step of introducing an expression vector into gamma delta T cells may be included.
- the alpha / beta T cell therapy includes a step of culturing lymphocytes collected from a patient with an anti-CD3 antibody or IL-2, and administering the activated alpha / beta T cells to the patient.
- a step of introducing into alpha-beta T cells may be included.
- lymphocytes collected from a patient are stimulated with cancer cells collected from the patient, and added with an anti-CD3 antibody or IL-2 and cultured to proliferate CTLs specific to the cancer cells to the patient.
- a step of administering may include a step of introducing the expression vector of the present invention into CTL. Moreover, it can replace with said cancer cell and can also utilize the antigen presentation cell which presents a cancer antigen epitope peptide.
- the TIL therapy includes a step of collecting lymphocytes from cancer tissue collected from a patient, stimulating and culturing with IL-2 or the like, and administering to the patient.
- the TIL therapy includes a step of introducing the expression vector of the present invention into lymphocytes. May be included.
- the expression vector of the present invention is any one of the following (a) to (e) for producing the above-mentioned IL-7 ⁇ CCL19-expressing immunocompetent cell of the present invention.
- A an expression vector containing a nucleic acid encoding a cell surface molecule that specifically recognizes a cancer antigen, a nucleic acid encoding IL-7, and a nucleic acid encoding CCL19:
- B The following two expression vectors (b-1) and (b-2): (B-1) an expression vector containing a nucleic acid encoding a cell surface molecule that specifically recognizes a cancer antigen;
- B-2) an expression vector containing a nucleic acid encoding IL-7 and a nucleic acid encoding CCL19;
- C The following two expression vectors (c-1) and (c-2): (C-1) an expression vector containing a nucleic acid encoding a cell surface molecule that specifically recognizes a cancer antigen, and a
- the expression vector of the present invention further comprises IL-15, CCL21, IL-2, IL-4, IL-12, IL-13, IL-17, IL-18, IP-10, CCL4, Flt3L, Interferon-gamma. , MIP-1alpha, GM-CSF, M-CSF, TGF-beta, TNF-alpha, and other nucleic acid-encoding nucleic acid-encoding nucleic acid may be contained.
- the nucleic acid encoding a cell surface molecule that specifically recognizes the cancer antigen, the nucleic acid encoding interleukin 7 (IL-7), and the nucleic acid encoding CCL19 can each include a nucleic acid derived from a mammal, Preferred examples include human-derived nucleic acids.
- Preferred examples include human-derived nucleic acids.
- Each of the above nucleic acids can be appropriately selected according to the type of cell into which the expression vector of the present invention is introduced, and the sequence information of each of these nucleic acids can be obtained from known literatures and NCBI (http: //www.ncbi.nlm.nih). .gov / guide /) and other databases can be searched and obtained as appropriate.
- a human-derived nucleic acid As a nucleic acid encoding a cell surface molecule that specifically recognizes the cancer antigen, a human-derived nucleic acid can be preferably mentioned.
- the nucleic acid encoding a cell surface molecule that specifically recognizes such a cancer antigen can include a nucleic acid encoding a T cell receptor (TCR) or a nucleic acid encoding a chimeric antigen receptor (CAR). Or an artificially synthesized nucleic acid, which can be appropriately selected according to the type of cell into which the expression vector of the present invention is introduced. Sequence information can be obtained from known literatures and NCBI (http: //www.ncbi.nlm.nih. Gov / guide /) and other databases can be searched and obtained as appropriate.
- a nucleic acid encoding a cell surface molecule that specifically recognizes a cancer antigen, a nucleic acid encoding IL-7, and a nucleic acid encoding CCL19 are chemically synthesized based on the information on the base sequence of the nucleic acid encoding each of them. It can be prepared by a known technique such as a method of amplification by PCR. It should be noted that the codon selected for encoding the amino acid may be modified to optimize the expression of the nucleic acid in the intended host cell.
- the TCR in the nucleic acid encoding the TCR may be a heterodimer consisting of an alpha chain and a beta chain (alpha / beta TCR) or a heterodimer consisting of a gamma chain and a delta chain (gamma / delta TCR).
- the nucleic acid encoding the alpha / beta TCR includes both the nucleic acid encoding the alpha chain of the TCR and the nucleic acid encoding the beta chain.
- the nucleic acid encoding the gamma / delta TCR includes the gamma chain of the TCR. Both encoding nucleic acids and nucleic acids encoding delta chains are included.
- sequence information of the nucleic acid encoding the TCR is identified from the nucleic acid of the alpha chain and the beta chain as the TCR subunit of CTL derived using a specific antigen peptide by using a known method in the art. (WO 2007/032255 and Morgan et al., J Immunol, 171, 3288 (2003)). For example, the PCR method is preferable for analyzing TCR.
- PCR primers for analysis are specific to, for example, a 5′-R primer (5′-gtctaccagcatcatgcttcat-3 ′: SEQ ID NO: 3) as a 5 ′ primer and a TCR alpha chain C region as a 3 ′ primer 3-TRa-C primer (5'-tcagctggaccacagccgcagcgt-3 ': SEQ ID NO: 4), 3-TRb-C1 primer specific for the TCR beta chain C1 region (5'-tcagaatccttttcttctctacac-3': SEQ ID NO: 5) Or a 3-TRbeta-C2 primer specific for the TCR beta chain C2 region (5′-cttagccctctgaatccttttctctttttt-3 ′: SEQ ID NO: 6), but is not limited thereto.
- TCR derivatives can bind with high avidity to target cells presenting antigenic peptides
- Examples of the nucleic acid encoding TCR include MART1-specific TCR (Cancer Res. 54, 5265-5268 (1994)), MAGE-A3-specific TCR (Anticancer Res., 20, 1793-1799 (2000)), gp100 Specific TCR (J. Immunol. 170, 2186-2194 (2003)), NY-ESO-1 specific TCR (J. Immunol., 174, 4415-4423 (2005)), WT1-specific TCR (Blood, 106, 470) -476 (2005)), MAGE-A1-specific TCR (Int. Immunol., 8, 1463-1466 (1996)), P1A-specific TCR (Sarma, S., Y. Guo, Y.
- the nucleotide sequence encoding the TCR described in the above document When 80% or more, preferably 85% or more, more preferably 90% or more, more preferably 95% or more, and most preferably may be a nucleotide sequence having 98% or more identity.
- a sequence encoding CDR is specified, a sequence encoding such CDR is maintained, and a sequence other than the sequence encoding CDR is described in the above-mentioned document. It may be a base sequence having the identity of 60% or more, preferably 70% or more, more preferably 80% or more, still more preferably 90% or more, and most preferably 95% or more with the base sequence encoding the TCR described.
- nucleic acid encoding IL-7 examples include a base sequence encoding the amino acid sequence shown in SEQ ID NO: 1, and as long as it has an effect of enhancing cell proliferation rate or cell viability in IL-7, It may be a base sequence having 80% or more, preferably 85% or more, more preferably 90% or more, still more preferably 95% or more, and most preferably 98% or more identity with the base sequence encoding the amino acid sequence shown.
- nucleic acid encoding CCL19 examples include a base sequence encoding the amino acid sequence shown in SEQ ID NO: 2, and as long as it has a cell migration action in CCL19, a base sequence encoding the amino acid sequence shown in SEQ ID NO: 2 and 80 % Or more, preferably 85% or more, more preferably 90% or more, still more preferably 95% or more, and most preferably 98% or more, may be used.
- the expression vector of the present invention may contain a nucleic acid encoding a suicide gene.
- the suicide gene means a gene having a function of inducing a cytotoxic substance directly or secondaryly by expressing it and causing its own cells to die.
- a nucleic acid encoding a suicide gene in the expression vector of the present invention, for example, a drug that activates the function of the suicide gene when the tumor disappears is administered according to the course of cancer treatment. Immunocompetent cells can be controlled.
- IL-7 or CCL19 is unlikely to cause cytokine release syndrome and tumorigenesis of transgenic cells as side effects.
- the function of the immunocompetent cells into which the expression vector of the present invention has been introduced is enhanced, so that cytokines and the like released when attacking the target cancer tissue may unexpectedly affect the surrounding tissues.
- cytokines and the like released when attacking the target cancer tissue may unexpectedly affect the surrounding tissues.
- by including a nucleic acid encoding a suicide gene in the expression vector of the present invention the risk of cytokine release syndrome can be reliably reduced.
- suicide genes include the herpes simplex virus thymidine kinase (HSV-TK) and inducible caspase-9 genes described in the following documents, and the like.
- drugs to be converted include ganciclovir for the former and AP1903 which is a dimerization compound (chemical) for the latter (Cooper LJ., Et. Al. Cytotherapy. 2006; 8 (2): 105-17., Jensen M. C. et. Al. Biol Blood Marrow Transplant. 2010 Sep; 16 (9): 1245-56., Jones BS. Front Pharmacol.2014 Nov 27; 5 : 254., Minagawa K., Pharmaceuticals (Basel). 2015 May 8; 8 (2): 230-49., Bole-Richard E., Front Pharmacol. 2015 Aug 25; 6: 174).
- the expression vector containing (a) a nucleic acid encoding a cell surface molecule that specifically recognizes a cancer antigen, a nucleic acid encoding IL-7, and a nucleic acid encoding CCL19 in the vector of the present invention is any nucleic acid. May be located upstream or downstream. Specifically, in the case of containing a nucleic acid encoding TCR as a nucleic acid encoding a cell surface molecule that specifically recognizes a cancer antigen, for example, a nucleic acid encoding TCR, IL-7, is encoded in order from upstream.
- the arrangement of the nucleic acid encoding IL-7 and the nucleic acid encoding CCL19 is particularly limited Alternatively, the nucleic acid encoding CCL19 may be located upstream or downstream of the nucleic acid encoding IL-7.
- the cancer antigen is specifically
- the arrangement of the nucleic acid encoding the cell surface molecule to be recognized and the nucleic acid encoding IL-7 is not particularly limited, and it encodes IL-7 to the nucleic acid encoding the cell surface molecule that specifically recognizes the cancer antigen.
- the nucleic acid may be arranged upstream or downstream.
- a cancer antigen is specifically recognized in an expression vector containing a nucleic acid encoding a cell surface molecule that specifically recognizes a cancer antigen and a nucleic acid encoding CCL19.
- the arrangement of the nucleic acid encoding the cell surface molecule and the nucleic acid encoding CCL19 is not particularly limited, and the nucleic acid encoding CCL19 is arranged upstream of the nucleic acid encoding the cell surface molecule that specifically recognizes the cancer antigen. Alternatively, it may be arranged downstream.
- the nucleic acid encoding a cell surface molecule specifically recognizing a cancer antigen, the nucleic acid encoding IL-7, and the nucleic acid encoding CCL19 may be transcribed by different promoters, respectively, and an internal ribosome entry site (IRES) : Internal ribozyme entry site) or self-cleavable 2A peptide may be used for transcription with one promoter.
- IRS internal ribosome entry site
- self-cleavable 2A peptide may be used for transcription with one promoter.
- the internal ribosome entry site (IRES) or self-cleavable 2A peptide is used to transcribe a nucleic acid encoding IL-7 and a nucleic acid encoding CCL19 with a single promoter, between the above nucleic acids, or the above cancer antigen
- IRS internal ribosome entry site
- a nucleic acid encoding a cell surface molecule that specifically recognizes IL-7 and a nucleic acid encoding CCL19 or in the case of containing a nucleic acid encoding alpha / beta TCR
- Any nucleic acid may be included as long as it can express the self-cleaving peptide (2A peptide
- the position of the suicide gene is not particularly limited.
- it encodes IL-7, a nucleic acid encoding a cell surface molecule that specifically recognizes a cancer antigen.
- the nucleic acid or the CCL19-encoding nucleic acid may be arranged downstream of the promoter for expressing the nucleic acid or a sequence encoding the 2A peptide or IRES, or may be arranged downstream of the other promoter. May be.
- the 2A peptide is a self-cleaving peptide derived from a virus, and has a feature that the portion between GP in the amino acid sequence represented by SEQ ID NO: 7 (position of one residue from the C-terminus) is cleaved by the endoplasmic reticulum ( Szymczak et al., Expert Opin. Biol. Ther.5 (5): 627-638 (2005)). Therefore, nucleic acids incorporated before and after the 2A peptide are expressed independently of each other in the cell.
- the 2A peptide is preferably a 2A peptide derived from picornavirus, rotavirus, insect virus, aft virus or trypanosoma virus, and preferably a 2A peptide derived from picornavirus shown in SEQ ID NO: 8 (F2A). More preferred.
- the vector in the expression vector of the present invention may be linear or circular, and may be a non-viral vector such as a plasmid, a viral vector, or a transposon vector. Such vectors may also contain control sequences such as promoters and terminators, and selectable marker sequences such as drug resistance genes and reporter genes. By arranging a nucleic acid encoding IL-7 and a nucleic acid encoding CCL19 operably downstream of the promoter sequence, each nucleic acid can be efficiently transcribed.
- the promoter examples include retrovirus LTR promoter, SV40 early promoter, cytomegalovirus promoter, herpes simplex virus thymidine kinase promoter, and other virus-derived promoters, phosphoglycerate kinase (PGK) promoter, Xist promoter, ⁇ -actin promoter, A mammal-derived promoter such as RNA polymerase II promoter can be mentioned. Further, a tetracycline responsive promoter induced by tetracycline, an Mx1 promoter induced by interferon, or the like may be used. By using a promoter induced by the specific substance in the expression vector of the present invention, it becomes possible to control the induction of IL-7 and CCL19 expression according to the course of cancer treatment.
- the viral vector examples include a retrovirus vector, a lentivirus vector, an adenovirus vector, and an adeno-associated virus vector, preferably a retrovirus vector, and a pMSGV vector (Tamada k et al., Clin Cancer Res 18: 6436-6445 (2002)) and pMSCV vector (manufactured by Takara Bio Inc.) can be mentioned more suitably.
- a retroviral vector is used, the transgene is incorporated into the genome of the host cell and can be stably expressed over a long period of time.
- the expression vector of the present invention Confirmation of the presence of the expression vector of the present invention in immunocompetent cells, for example, in the case of containing a nucleic acid encoding TCR, TCR by PCR, ELISA, Western blotting such as flow cytometry, Northern blotting, Southern blotting, RT-PCR, etc.
- the expression vector of the present invention contains a marker gene, it can be confirmed by examining the expression of the marker gene inserted into the expression vector.
- the variable region of the TCR to be expressed is located outside the cell, and comprises the variable region of the TCR.
- the TCR-expressing immunocompetent cell can recognize the antigen molecule bound to the MHC molecule.
- the anticancer agent of the present invention is not particularly limited as long as it contains the IL-7 ⁇ CCL19-expressing immunocompetent cell of the present invention and a pharmaceutically acceptable additive.
- the additive include physiological saline , Buffered saline, cell culture medium, dextrose, water for injection, glycerol, ethanol and combinations thereof, stabilizers, solubilizers and surfactants, buffers and preservatives, isotonic agents, fillers, and lubricants An agent can be mentioned.
- the anticancer agent of the present invention can be administered to a subject in need of cancer treatment using methods known to those skilled in the art, and includes intravenous, intratumoral, intradermal, Mention may be made of subcutaneous, intramuscular, intraperitoneal, intraarterial, intramedullary, intracardiac, intraarticular, intrasynovial, intracranial, intrathecal, and subarachnoid (spinal fluid) injections.
- the amount of the IL-7 ⁇ CCL19-expressing immunocompetent cell of the present invention contained in the anticancer agent to be administered depends on the type, location, severity, and age, weight and condition of the subject to be treated. Although it can be adjusted as appropriate, it is preferably 1 ⁇ 10 4 to 1 ⁇ 10 10 , preferably 1 ⁇ 10 5 to 1 ⁇ 10 9 , more preferably 5 ⁇ 10 6 to 5 ⁇ 10 8 in one administration. Can be mentioned.
- Anticancer drugs to be administered are 4 times, 3 times, 2 times or 1 day, every other day, every 2 days, every 3 days, every 4 days, every 5 days, once a week, every 7 days, A method of independently administering every 8 days, every 9 days, twice a week, once a month or twice a month can be mentioned.
- the cancer in the anticancer agent of the present invention or the cancer treatment method described later may be solid cancer or blood cancer, and adenocarcinoma, squamous cell carcinoma, adenosquamous cell carcinoma, undifferentiated Cancer, large cell cancer, small cell cancer, skin cancer, breast cancer, prostate cancer, bladder cancer, vaginal cancer, cervical cancer, uterine cancer, liver cancer, kidney cancer, pancreatic cancer , Spleen cancer, lung cancer, tracheal cancer, bronchial cancer, colon cancer, small intestine cancer, stomach cancer, esophageal cancer, gallbladder cancer, testicular cancer, ovarian cancer, etc., bone tissue, cartilage
- sarcomas such as chondrosarcoma, Ewing sarcoma, malignant hemangioendothelioma, malignant schwannoma, osteosarcoma, soft
- the anticancer agent of the present invention can be used in combination with other anticancer agents.
- Other anticancer agents include alkylating agents such as cyclophosphamide, bendamustine, iosfamide, dacarbazine, antimetabolites such as pentostatin, fludarabine, cladribine, methotrexate, 5-fluorouracil, 6-mercaptopurine, and inositabine, Molecular targeting drugs such as rituximab, cetuximab, trastuzumab, kinase inhibitors such as imatinib, getininib, erlotinib, afatinib, dasatinib, sunitinib, trametinib, proteasome inhibitors such as bortezomib, calcidolmycin inhibitors such as cyclosporin, tacrolimine Anti-cancer antibiotics such as C, plant alkaloids such as irinotecan and
- a method of treating with another anticancer agent and then using the anticancer agent of the present invention is used.
- a method using the anticancer agent of the present invention and another anticancer agent at the same time, a method using the anticancer agent of the present invention, and then using another anticancer agent, A method using treatment with another anticancer agent and then using the anticancer agent of the present invention can be preferably mentioned.
- the anticancer agent of the present invention is used in combination with other anticancer agents, the therapeutic effect of cancer is further improved, and the number of administrations or doses of each anticancer agent is reduced. It becomes possible to reduce the side effects caused by the respective anticancer agents.
- an immunocompetent cell expressing a cell surface molecule specifically recognizing a cancer antigen, interleukin 7 (IL-7), and CCL19 is required for cancer treatment.
- a cell surface molecule that specifically recognizes a cancer antigen for use as an anticancer agent, interleukin 7 (IL-7) And an immunocompetent cell that expresses CCL19 is required for cancer treatment.
- a cell surface molecule that specifically recognizes a cancer antigen for use as an anticancer agent, interleukin 7 (IL-7) And an immunocompetent cell that expresses CCL19 3) a cell surface molecule that specifically recognizes a cancer antigen, interleukin 7 (IL-7), and an immunocompetent cell that expresses CCL19. Mention may be made of use in the preparation.
- an immunity expressing a cell surface molecule specifically recognizing a cancer antigen, interleukin 7 (IL-7), and CCL19 comprising the expression vector of the present invention.
- a kit for preparing the responsible cells can be mentioned. Such a kit is not particularly limited as long as it comprises the expression vector of the present invention, and for preparing the IL-7 ⁇ CCL19-expressing immunocompetent cells of the present invention. And a reagent used for introducing the expression vector of the present invention into an immunocompetent cell.
- IL-7 and CCL19 are at least several hundred types of molecules that can control the function of T cells in vivo.
- the inventors first selected IL-7 and CCL19 from among a vast number of combinations based on the knowledge and experience so far, as a control molecule for enhancing further immune function control effects in immunocompetent cells, and Two combinations, ie, a combination of IL-7 and CCL19, were selected instead of each alone, and a vector expressing an immune function regulator of such immunocompetent cells was prepared.
- Anti-FITC CAR DNA fragment (SEQ ID NO: 9) encoding anti-FITC CAR comprising anti-FITC scFv, mouse CD8 transmembrane region, mouse CD28-4-1BB-CD3 ⁇ intracellular signal motif (SEQ ID NO: 9), 2A peptide shown in SEQ ID NO: 8 (F2A ), A F2A-MCS DNA fragment (SEQ ID NO: 10) encoding a restriction enzyme site (MCS) following the peptide, mouse IL-7 (no stop codon), followed by IL-7 encoding F2A and mouse CCL19 -F2A-CCL19 DNA fragment (SEQ ID NO: 11) was artificially synthesized (Life Technologies).
- the anti-FITC CAR-F2A-MCS construct was prepared by ligating the anti-FITC CAR DNA fragment and the F2A-MCS DNA fragment.
- the constructed construct was cloned into a pMSGV retrovirus expression vector (Tamada k et al., Clin Cancer Res18: 6436-6445 (2002)) to prepare a pMSGV vector containing anti-FITC CAR-F2A-MCS.
- IL-7 ⁇ CCL19 expression vector (1) was obtained.
- the map of the obtained vector is shown in FIG.
- the anti-FITC CAR DNA fragment was cloned into the pMSGV retrovirus expression vector to prepare a pMSGV vector (control vector (1)) free of IL-7 and CCL19.
- Retroviruses were generated for transduction of mouse T cells. Using Lipofectamine 2000 or 3000 (Life Technologies), the above-mentioned IL-7 ⁇ CCL19 expression vector (1) or control vector (1) and the pCL-Eco plasmid (Imgenex) were used in the GP2-293 packaging cell line A retrovirus introduced with an IL-7 ⁇ CCL19 expression vector (1) or a control vector (1) was prepared by transfection (Takara Bio Inc.).
- DMEM fetal calf serum
- RPMI-1640 containing 10% FCS, 100 U / ml penicillin, 100 mg / ml streptomycin, 50 mM 2-mercaptoethanol, and 2 mM L-glutamine was added.
- RPMI-1640 containing 10% FCS, 100 U / ml penicillin, 100 mg / ml streptomycin, 50 mM 2-mercaptoethanol, and 2 mM L-glutamine was added.
- mouse T cells (1 ⁇ 10 6 cells / ml) activated with the coated plate were mixed, centrifuged at 1500 rpm for 2 hours, and cultured in the presence of IL-2 (100 IU / ml) for 6 hours.
- mouse T cells were collected, transferred to a new growth medium (RPMI) containing IL-2 (100 IU / ml), and further cultured for 42 hours to express IL-7 ⁇ CCL19
- the anti-FITC scFv region sequence contained in the sequence shown in SEQ ID NO: 9 is the anti-human CD20 scFv (sequence) synthesized by Life Technology based on the sequence of rituximab.
- a vector (IL-7 ⁇ CCL19 expression vector (2)) was prepared.
- control vector (2) the sequence of the anti-FITC scFv region contained in the sequence shown in SEQ ID NO: 9 was replaced with the sequence of the anti-human CD20 scFv (SEQ ID NO: 12).
- a pMSGV vector (control vector (2)) free from IL-7 and CCL19 was prepared in the same manner as in “Preparation of expression vector expressing IL-7 and CCL19-1”.
- Such IL-7 ⁇ CCL19 expression vector (2) or control vector (2) is introduced into mouse T cells using a retrovirus in the same manner as described above, and IL-7 / CCL19-expressing T cells (2) or Control T cells (2) were prepared.
- FIGS. 2A and 2B show the number of cells
- FIG. 2A shows the number of cells
- FIG. 2B shows the survival rate
- black column IL-7 / CCL19-expressing T cells and white column showing control T cells.
- T cell migration test T cell migration test using IL-7 / CCL19 expressing T cells
- the effect of CCL19 to induce migration was examined by a cell migration test using a transwell.
- Responsive T cell migration was measured by migration through a polycarbonate filter with a pore size of 5 ⁇ m using a 96-well Transwell® chamber (Cornig Costar).
- IL-7 / CCL19-expressing T cells (1) or control T cells (1) were cultured in the lower layer of the chamber.
- the above-mentioned culture was performed without antibody stimulation by FITC.
- Responding T cells were prepared from spleen and lymph nodes by negative selection with MACS (Miltenyi Biotec). Responding T cells were labeled with CytoTell blue (manufactured by AAT Bioquest) and cultured in the upper layer for 3 hours. Migration from the upper layer to the lower layer of the chamber was examined by flow cytometry (EC800: manufactured by Sony Corporation), and FlowJo software (manufactured by Tree Star) was used for data analysis. The results are shown in FIG. In FIG. 3, the black column represents IL-7 / CCL19-expressing T cells (1), the white column represents control T cells (1), and the vertical axis represents the absolute number of responding T cells that migrated to the lower chamber. Statistical significance was examined by Student's t-test.
- IL-7 / CCL19-expressing T cells (1) migrated approximately 1.8 times as many T cells to the lower layer as compared to control T cells (1).
- endogenous T cells host side immune cells
- lymphocytes having antitumor activity are not simply transferred from the outside, but by some technique, an active interaction between the transferred T cells and the endogenous T cells is induced, and the endogenous T cells are removed.
- IL-7 / CCL19-expressing T cells (1) have the ability to accumulate endogenous T cells, and thus induce an active interaction between the transferred T cells and the endogenous T cells. It became clear that it was possible.
- IL-7 and CCL19-expressing T cells proliferate effectively by IL-7, have a high survival rate, and accumulate T cells by CCL19. It has an important effect essential for induction, and has been found to have an excellent immune induction effect. That is, by expressing two regulatory molecules “IL-7” and “CCL19” in immunocompetent cells, it is possible to improve the proliferation ability, survival rate, and immune induction effect of such immunocompetent cells. Became clear. Furthermore, as described above, T cells expressing IL-7 and CCL19 have proliferative ability, viability, and T cell accumulation ability. Therefore, the penetration effect of T cells and dendritic cells in cancer tissues It was also suggested that it may have a tumor growth inhibitory effect.
- the immunocompetent cells introduced with the IL-7 ⁇ CCL19 ⁇ HSV-TK expression vector prepared as described above control the immunocompetent cells in the subject by administering ganciclovir to the subject to which the immunocompetent cells have been administered. It becomes possible to do.
- the immunocompetent cells introduced with the TCR ⁇ IL-7 ⁇ CCL19 expression vector prepared as described above are derived not only from cancer antigens existing on the surface of cancer cells but also from cancer antigens in cancer cells.
- the peptide can also specifically bind to the complex presented on the MHC, allowing the induction of specific T cells for a wider range of tumor-associated target molecules.
- the IL-7-F2A-CCL19 DNA fragment synthesized above was transformed into a pMSGV retrovirus expression vector (Tamadaamak et al., Which has F2A-eGFP sequence). Clin Cancer Res 18: 6436-6445 (2002)) inserted by restriction enzyme (NCOI and ECORI) treatment and ligation, and contains IL-7-F2A-CCL19-F2A-eGFP DNA fragment (SEQ ID NO: 13)
- a pMSGV vector (IL-7 ⁇ CCL19 expression vector (3)) was obtained. A map of the obtained vector is shown in FIG.
- a pMSGV vector (control vector (3)) containing eGFP and not containing IL-7 and CCL19 was prepared as a control.
- the 1st to 462nd bases are IL-7 (the 1st to 75th bases are IL-7 signal sequences)
- the 463th to 537th bases are F2A
- the 538th to 861st bases are CCL19.
- the 538th to 612th bases are CCL19 signal sequences
- 868 to 942 are F2A
- the 946th to 1662th bases are nucleic acids encoding eGFP
- the 1663th to 1665th bases are stop codons.
- the amino acid sequence corresponding to the base sequence 13 is shown in SEQ ID NO: 14.
- T cells expressing P815 tumor antigen P1A-specific TCR, IL-7, CCL19, and eGFP Y. Transgenic mice (Sarma, S., Y. Guo, Y. Guilloux, C. Lee, X.-F. Bai expressing H-2L d- restricted P815 tumor antigen P1A-specific TCR obtained from Liu , Y. Liu. 1999. J. Exp. Med. 189: 811.) Spleen cells were collected and spleen cell-derived P815 tumor antigen P1A-specific TCR-expressing mouse T cells (P1A-specific TCR-T Cell).
- a retrovirus having the IL-7 ⁇ CCL19 expression vector (3) and the control vector (3) introduced therein was prepared by the same method as in Example 1, and spleen cells containing the P1A-specific TCR-T cells ( 3 ⁇ 10 6 cells / well) were transduced into cells activated with P1A peptide for 48 hours, and P1A-specific TCR / IL-7 / CCL19 / eGFP-expressing T cells or P1A-specific TCR / eGFP-expressing T cells were Obtained. Transduction of each expression vector was confirmed by flow cytometry analysis detecting eGFP as a surrogate marker. The expression level of eGFP in each of the obtained T cells was 70 to 80% in all experiments.
- ⁇ is the result of an untreated mouse
- ⁇ is a mouse administered with a P1A-specific TCR / eGFP-expressing T cell
- ⁇ is a result of a mouse administered with a P1A-specific TCR / IL-7 / CCL19 / eGFP-expressing T cell.
- the horizontal axis is the number of days after subcutaneous inoculation of P815 mast cytoma (day), and the vertical axis is the survival rate (%).
- Mice administered with P1A-specific TCR / IL-7 / CCL19 / eGFP-expressing T cells survived 80% even at 60 days and 50% survived beyond 100 days. Therefore, it has been clarified that the use of immunocompetent cells expressing P1A-specific TCR, IL-7 and CCL19 exerts an antitumor effect and suppresses a decrease in the survival rate due to the tumor.
- the horizontal axis represents the number of days (day) after subcutaneous inoculation with P815 mast cytoma
- the vertical axis represents the tumor volume (mm 3 ).
- the increase in tumor volume was remarkably suppressed in mice administered with P1A-specific TCR / IL-7 / CCL19 / eGFP-expressing T cells, and P1A-specific TCR / IL-7 / CCL19 / It has been clarified that eGFP-expressing T cells have excellent antitumor activity and exert a therapeutic effect on solid cancer.
- the IL-7 ⁇ CCL19-expressing immunocompetent cell of the present invention has proliferative ability, viability, and lymphocyte accumulation ability, and can be used in the field of immunotherapy.
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Abstract
Description
(1)がん抗原を特異的に認識する細胞表面分子、インターロイキン7(IL-7)、及びCCL19を発現する免疫担当細胞。
(2)がん抗原を特異的に認識する細胞表面分子が、がん抗原を特異的に認識するT細胞受容体であることを特徴とする上記(1)記載の免疫担当細胞。
(3)免疫担当細胞がT細胞であることを特徴とする上記(1)又は(2)記載の免疫担当細胞。
(4)がん抗原が、WT1、MART-1、NY-ESO-1、MAGE-A1、MAGE-A3、MAGE-A4、Glypican-3、KIF20A、Survivin、AFP-1、gp100、MUC1、PAP-10、PAP-5、TRP2-1、SART-1、VEGFR1、VEGFR2、NEIL3、MPHOSPH1、DEPDC1、FOXM1、CDH3、TTK、TOMM34、URLC10、KOC1、UBE2T、TOPK、ECT2、MESOTHELIN、NKG2D、P1A、GD2、又はGM2であることを特徴とする上記(1)~(3)のいずれか1つに記載の免疫担当細胞。
(5)上記(1)~(4)のいずれか1つに記載の免疫担当細胞を作製するための以下の(a)~(e)のいずれかの発現ベクター。
(a)がん抗原を特異的に認識する細胞表面分子をコードする核酸、IL-7をコードする核酸、及びCCL19をコードする核酸を含有する発現ベクター:
(b)以下の(b-1)及び(b-2)の2つの発現ベクター:
(b-1)がん抗原を特異的に認識する細胞表面分子をコードする核酸を含有する発現ベクター;
(b-2)IL-7をコードする核酸、及びCCL19をコードする核酸を含有する発現ベクター;
(c)以下の(c-1)及び(c-2)の2つの発現ベクター:
(c-1)がん抗原を特異的に認識する細胞表面分子をコードする核酸、及びIL-7をコードする核酸を含有する発現ベクター;
(c-2)CCL19をコードする核酸を含有する発現ベクター;
(d)以下の(d-1)及び(d-2)の2つの発現ベクター:
(d-1)IL-7をコードする核酸を含有する発現ベクター;
(d-2)がん抗原を特異的に認識する細胞表面分子をコードする核酸、及びCCL19をコードする核酸を含有する発現ベクター;
(e)以下の(e-1)、(e-2)及び(e-3)の3つの発現ベクター:
(e-1)がん抗原を特異的に認識する細胞表面分子をコードする核酸を含有する発現ベクター;
(e-2)IL-7をコードする核酸を含有する発現ベクター;
(e-3)CCL19をコードする核酸を含有する発現ベクター;
(6)がん抗原を特異的に認識する細胞表面分子が、がん抗原を特異的に認識するT細胞受容体であることを特徴とする上記(5)記載の発現ベクター。
(7)(a)の発現ベクターにおける、がん抗原を特異的に認識する細胞表面分子をコードする核酸、IL-7をコードする核酸、及び、CCL19をコードする核酸、
(b-2)の発現ベクターにおける、IL-7をコードする核酸、及びCCL19をコードする核酸、
(c-1)の発現ベクターにおける、がん抗原を特異的に認識する細胞表面分子をコードする核酸、及びIL-7をコードする核酸、又は
(d-2)の発現ベクターにおける、がん抗原を特異的に認識する細胞表面分子をコードする核酸、及びCCL19をコードする核酸、
が自己切断型ペプチドを介して連結されていることを特徴とする上記(5)又は(6)記載の発現ベクター。
(8)自殺遺伝子をコードする核酸を含有することを特徴とする上記(5)~(7)のいずれか1つに記載の発現ベクター。
(9)上記(1)~(4)のいずれか1つに記載の免疫担当細胞と、薬学的に許容される添加剤とを含有する抗がん剤。
(a)がん抗原を特異的に認識する細胞表面分子をコードする核酸、IL-7をコードする核酸、及びCCL19をコードする核酸を含有する発現ベクター:
(b)以下の(b-1)及び(b-2)の2つの発現ベクター:
(b-1)がん抗原を特異的に認識する細胞表面分子をコードする核酸を含有する発現ベクター;
(b-2)IL-7をコードする核酸、及びCCL19をコードする核酸を含有する発現ベクター;
(c)以下の(c-1)及び(c-2)の2つの発現ベクター:
(c-1)がん抗原を特異的に認識する細胞表面分子をコードする核酸、及びIL-7をコードする核酸を含有する発現ベクター;
(c-2)CCL19をコードする核酸を含有する発現ベクター;
(d)以下の(d-1)及び(d-2)の2つの発現ベクター:
(d-1)IL-7をコードする核酸を含有する発現ベクター;
(d-2)がん抗原を特異的に認識する細胞表面分子をコードする核酸、及びCCL19をコードする核酸を含有する発現ベクター;
(e)以下の(e-1)、(e-2)及び(e-3)の3つの発現ベクター:
(e-1)がん抗原を特異的に認識する細胞表面分子をコードする核酸を含有する発現ベクター;
(e-2)IL-7をコードする核酸を含有する発現ベクター;
(e-3)CCL19をコードする核酸を含有する発現ベクター;
T細胞の機能を制御できる分子は少なくとも生体内に数百種類も存在する。発明者らは、免疫担当細胞における更なる免疫機能制御効果を高めるための制御分子として、これまでの知見や経験に基づき、膨大な組み合わせの中からまずはIL-7とCCL19を選択し、かつ、それぞれ単独ではなく2つの組み合わせ、すなわちIL-7とCCL19との組み合わせを選択し、かかる免疫担当細胞の免疫機能制御因子を発現するベクターを作製した。
抗FITC scFv、マウスCD8膜貫通領域、マウスCD28-4-1BB-CD3ζ細胞内シグナルモチーフからなる抗FITC CARをコードする抗FITC CAR DNA断片(配列番号9)、配列番号8に示す2Aペプチド(F2A)と、該ペプチドに続く制限酵素サイト(MCS)をコードするF2A-MCS DNA断片(配列番号10)、マウスIL-7(ストップコドン無し)と、それに続くF2AとマウスCCL19をコードするIL-7-F2A-CCL19 DNA断片(配列番号11)を人工合成した(ライフテクノロジー社製)。
マウスT細胞の形質導入のために、レトロウイルスを作製した。リポフェクタミン2000又は3000(ライフテクノロジー社製)を用い、上述のIL-7×CCL19発現ベクター(1)又はコントロールベクター(1)と、pCL-Ecoプラスミド(Imgenex社製)をGP2-293パッケージング細胞株(タカラバイオ社製)にトランスフェクションすることで、IL-7×CCL19発現ベクター(1)又はコントロールベクター(1)を導入したレトロウイルスを作製した。
マウスT細胞の形質導入のため、脾臓及びリンパ節由来の3×106個の精製したマウスT細胞を、固層化した抗CD3mAb(3μg/ml)及びIL-2(100IU/ml)で48時間活性化した。次に、上述で作製したIL-7×CCL19発現ベクター(1)又はコントロールベクター(1)を導入したレトロウイルスを含有する上清を、25μg/mlのレトロネクチン(登録商標:タカラバイオ社製)でコートしたプレートで活性化させた上述のマウスT細胞(1×106cells/ml)と混合し、1500rpmで2時間遠心後、IL-2(100IU/ml)の存在下で6時間培養した。培養液からレトロウイルスを除去するため、マウスT細胞を回収し、IL-2(100IU/ml)を含有する新しい増殖培養液(RPMI)に移し、さらに42時間培養し、IL-7×CCL19発現ベクター(1)を導入したマウスT細胞(IL-7/CCL19発現T細胞(1))又はコントロールベクター(1)を導入したマウスT細胞(コントロールT細胞(1))を得た。
上記におけるIL-7×CCL19発現ベクター(1)の作製において、配列番号9に示す配列に含まれる抗FITC scFv領域の配列を、リツキシマブの配列に基づきライフテクノロジー社が合成した抗ヒトCD20 scFv(配列番号12)の配列に置換した以外は上記「IL-7及びCCL19を発現する発現ベクターの作製-1」と同様の方法で、抗ヒトCD20 CAR-F2A-IL-7-F2A-CCL19を含むpMSGVベクター(IL-7×CCL19発現ベクター(2))を作製した。同様に、上記におけるにおけるコントロールベクター(1)の作製において、配列番号9に示す配列に含まれる抗FITC scFv領域の配列を、上記抗ヒトCD20 scFv(配列番号12)の配列に置換した以外は上記「IL-7及びCCL19を発現する発現ベクターの作製-1」と同様の方法で、IL-7及びCCL19を含まないpMSGVベクター(コントロールベクター(2))を作製した。かかるIL-7×CCL19発現ベクター(2)又はコントロールベクター(2)を、上記と同様の方法でレトロウイルスを用いてマウスT細胞へ導入して、IL-7/CCL19発現T細胞(2)又はコントロールT細胞(2)を作製した。
IL-7/CCL19発現T細胞により産生されるIL-7やCCL19が生物的な機能を発揮し、免疫誘導効果を示すか否かについて検討した。作製したIL-7/CCL19発現T細胞(2)(4×105個)又はコントロールT細胞(2)を含有するサンプルを5日間培養した。上記培養は、IL-7及びCCL19の発現においてヒトCD20 CARによる影響を排除するため、CD20による抗原刺激なしで行った。次に、トリパンブルーによって細胞数と生存率を調べた。結果を図2A,図2Bに示す。図2Aは細胞数、図2Bは生存率であり、黒カラムIL-7/CCL19発現T細胞、白カラムはコントロールT細胞を示す。
図2A,図2Bに示すように、IL-7/CCL19発現T細胞(2)においてはコントロールT細胞(2)と比較して細胞数がおよそ5倍、生存率はおよそ2倍高くなっていた。したがって、本発明の発現ベクターをT細胞に導入したIL-7/CCL19発現T細胞を用いることで、IL-7やCCL19が生物的な機能を発揮し、免疫誘導効果を示すことが明らかとなった。
(IL-7/CCL19発現T細胞によるT細胞遊走試験)
トランスウェルを用いた細胞遊走試験により、CCL19の遊走惹起効果を検討した。応答側T細胞の遊走性は96ウェルのトランスウェル(登録商標)チャンバー(Cornig Costar社製)を用い、孔径5μmのポリカーボネートフィルターを通して遊走させることによって測定した。具体的には、チャンバーの下層でIL-7/CCL19発現T細胞(1)又はコントロールT細胞(1)を培養した。上記培養は、IL-7及びCCL19の発現においてFITC CARによる影響を排除するため、FITCによる抗体刺激なしで行った。応答側T細胞は、MACS(Miltenyi Biotec社製)のネガティブ選択によって、脾臓やリンパ節から調製した。応答側T細胞はCytoTell blue(AAT Bioquest社製)でラベルし、上層で3時間培養した。チャンバーの上層から下層への遊走はフローサイトメトリー(EC800:ソニー社製)で調べ、データ解析はFlowJoソフトウェア(Tree Star社製)を用いた。結果を図3に示す。図3中、黒カラムはIL-7/CCL19発現T細胞(1)、白カラムはコントロールT細胞(1)を示し、縦軸は下層のチャンバーに遊走した応答側T細胞の絶対数を示す。また、統計学的有意差はStudent’s t-testにて検討した。
図3に示すように、IL-7/CCL19発現T細胞(1)は、コントロールT細胞(1)と比較しておよそ1.8倍ものT細胞を下層に遊走させた。T細胞等のリンパ球移入療法では、投与したT細胞によるがん細胞傷害はもちろん重要であるが、それに加えて、がん患者に元々存在する内在性T細胞(=宿主側免疫細胞)を活性化し、がん細胞を攻撃する細胞として動員することが重要である。このためには抗腫瘍活性を有するリンパ球を単に外部から移入するだけでなく、何らかの手法で、移入したT細胞と内在性T細胞の能動的な相互作用を惹起し、内在性T細胞をがん局所に集積するようにさせることが免疫治療効果を高める点で好ましい。図3の結果より、IL-7/CCL19発現T細胞(1)は、内因性T細胞を集積させる能力を有することから、移入したT細胞と内在性T細胞の能動的な相互作用を誘導することが可能であることが明らかとなった。
pMSGV1ベクターのマルチクローニングサイトにIL-7、CCL19及び自殺遺伝子であるHSV-TKの各遺伝子をコードする塩基配列を、自己切断型ペプチドである2Aペプチドをコードする塩基配列を挟んでタンデムに並べた塩基配列をクローニングすることでIL-7、CCL19、及びHSV-TKを発現するベクターを作製することができる。かかるベクターのマップを図4に示す。
pMSGV1ベクターのマルチクローニングサイトにTCR、IL-7及びCCL19の各遺伝子をコードする塩基配列を、自己切断型ペプチドである2Aペプチドをコードする塩基配列を挟んでタンデムに並べた塩基配列をクローニングすることでTCR、IL-7及びCCL19を発現するベクターを作製することができる。かかるベクターのマップを図5に示す。
マウスIL-7(ストップコドン無し)と、それに続くF2A、マウスCCL19をコードするIL-7-F2A-CCL19 DNA断片を人工合成した(ライフテクノロジー社製)。
Y.Liuから入手した、H-2Ld拘束性のP815腫瘍抗原P1A特異的なTCRを発現するトランスジェニックマウス(Sarma, S., Y. Guo, Y. Guilloux, C. Lee, X.-F. Bai, Y. Liu. 1999. J. Exp. Med. 189:811.)から脾臓細胞を採取し、脾臓細胞由来のP815腫瘍抗原P1A特異的なTCRを発現するマウスT細胞(P1A特異的TCR-T細胞)を得た。次に、実施例1と同様の方法で、IL-7×CCL19発現ベクター(3)及びコントロールベクター(3)を導入したレトロウイルスを作製し、上記P1A特異的TCR-T細胞を含む脾臓細胞(3×106個/ウェル)をP1Aペプチドで48時間活性化した細胞に形質導入して、P1A特異的TCR/IL-7/CCL19/eGFP発現T細胞又はP1A特異的TCR/eGFP発現T細胞を得た。各発現ベクターの形質導入はサロゲートマーカーとしてeGFPを検出するフローサイトメトリー解析によって確認した。得られたそれぞれのT細胞のeGFPの発現レベルは、いずれの実験においても70~80%であった。
Claims (9)
- がん抗原を特異的に認識する細胞表面分子、インターロイキン7(IL-7)、及びCCL19を発現する免疫担当細胞。
- がん抗原を特異的に認識する細胞表面分子が、がん抗原を特異的に認識するT細胞受容体であることを特徴とする請求項1記載の免疫担当細胞。
- 免疫担当細胞がT細胞であることを特徴とする請求項1又は2記載の免疫担当細胞。
- がん抗原が、WT1、MART-1、NY-ESO-1、MAGE-A1、MAGE-A3、MAGE-A4、Glypican-3、KIF20A、Survivin、AFP-1、gp100、MUC1、PAP-10、PAP-5、TRP2-1、SART-1、VEGFR1、VEGFR2、NEIL3、MPHOSPH1、DEPDC1、FOXM1、CDH3、TTK、TOMM34、URLC10、KOC1、UBE2T、TOPK、ECT2、MESOTHELIN、NKG2D、P1A、GD2、又はGM2であることを特徴とする請求項1~3のいずれか1項に記載の免疫担当細胞。
- 請求項1~4のいずれか1項に記載の免疫担当細胞を作製するための以下の(a)~(e)のいずれかの発現ベクター。
(a)がん抗原を特異的に認識する細胞表面分子をコードする核酸、IL-7をコードする核酸、及びCCL19をコードする核酸を含有する発現ベクター:
(b)以下の(b-1)及び(b-2)の2つの発現ベクター:
(b-1)がん抗原を特異的に認識する細胞表面分子をコードする核酸を含有する発現ベクター;
(b-2)IL-7をコードする核酸、及びCCL19をコードする核酸を含有する発現ベクター;
(c)以下の(c-1)及び(c-2)の2つの発現ベクター:
(c-1)がん抗原を特異的に認識する細胞表面分子をコードする核酸、及びIL-7をコードする核酸を含有する発現ベクター;
(c-2)CCL19をコードする核酸を含有する発現ベクター;
(d)以下の(d-1)及び(d-2)の2つの発現ベクター:
(d-1)IL-7をコードする核酸を含有する発現ベクター;
(d-2)がん抗原を特異的に認識する細胞表面分子をコードする核酸、及びCCL19をコードする核酸を含有する発現ベクター;
(e)以下の(e-1)、(e-2)及び(e-3)の3つの発現ベクター:
(e-1)がん抗原を特異的に認識する細胞表面分子をコードする核酸を含有する発現ベクター;
(e-2)IL-7をコードする核酸を含有する発現ベクター;
(e-3)CCL19をコードする核酸を含有する発現ベクター; - がん抗原を特異的に認識する細胞表面分子が、がん抗原を特異的に認識するT細胞受容体であることを特徴とする請求項5記載の発現ベクター。
- (a)の発現ベクターにおける、がん抗原を特異的に認識する細胞表面分子をコードする核酸、IL-7をコードする核酸、及び、CCL19をコードする核酸、
(b-2)の発現ベクターにおける、IL-7をコードする核酸、及びCCL19をコードする核酸、
(c-1)の発現ベクターにおける、がん抗原を特異的に認識する細胞表面分子をコードする核酸、及びIL-7をコードする核酸、又は
(d-2)の発現ベクターにおける、がん抗原を特異的に認識する細胞表面分子をコードする核酸、及びCCL19をコードする核酸、
が自己切断型ペプチドを介して連結されていることを特徴とする請求項5又は6記載の発現ベクター。 - 自殺遺伝子をコードする核酸を含有することを特徴とする請求項5~7のいずれか1項に記載の発現ベクター。
- 請求項1~4のいずれか1項に記載の免疫担当細胞と、薬学的に許容される添加剤とを含有する抗がん剤。
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| ZA (1) | ZA201805913B (ja) |
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| WO2019219029A1 (zh) | 2018-05-15 | 2019-11-21 | 科济生物医药(上海)有限公司 | 基因工程化的细胞及应用 |
| WO2021085497A1 (ja) | 2019-10-28 | 2021-05-06 | ノイルイミューン・バイオテック株式会社 | がんを治療するための医薬、組み合わせ医薬、医薬組成物、免疫応答性細胞、核酸送達媒体、及び製品 |
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