WO2015020212A1 - 癌の治療及び/又は予防用医薬組成物 - Google Patents
癌の治療及び/又は予防用医薬組成物 Download PDFInfo
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Classifications
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-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2317/00—Immunoglobulins specific features
- C07K2317/50—Immunoglobulins specific features characterized by immunoglobulin fragments
- C07K2317/56—Immunoglobulins specific features characterized by immunoglobulin fragments variable (Fv) region, i.e. VH and/or VL
- C07K2317/565—Complementarity determining region [CDR]
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2317/00—Immunoglobulins specific features
- C07K2317/70—Immunoglobulins specific features characterized by effect upon binding to a cell or to an antigen
- C07K2317/73—Inducing cell death, e.g. apoptosis, necrosis or inhibition of cell proliferation
- C07K2317/732—Antibody-dependent cellular cytotoxicity [ADCC]
Definitions
- the present invention relates to a novel pharmaceutical use of an antibody against CAPRIN-1 or a fragment thereof as a therapeutic and / or prophylactic agent for cancer.
- Cancer is a disease that occupies the top cause of all deaths, and the current treatment is a combination of radiation therapy and chemotherapy, mainly surgery. Despite the recent development of new surgical methods and the discovery of new anti-cancer drugs, the therapeutic results of cancer have not improved much except for some cancers. In recent years, advances in molecular biology and cancer immunology have identified antibodies that react specifically with cancer, cancer antigens that are recognized by cytotoxic T cells, genes that encode cancer antigens, etc. There is a growing expectation for specific cancer treatments targeting cancer antigens.
- Cytoplasma-activation and association-associated protein 1 (CAPRIN-1) is expressed when quiescent normal cells are activated or undergo cell division, and forms intracellular stress granules with RNA in the cells. It was known as an intracellular protein known to be involved in the control of transport and translation, but it was found to be specifically expressed on the surface of cancer cells, and is a target for antibody drugs for cancer treatment (Patent Documents 1 to 19).
- An object of the present invention is to produce an antibody having antitumor activity superior to conventional antibodies targeting CAPRIN-1 that is specifically expressed on the surface of cancer cells, and as an agent for treating and / or preventing cancer. Is to provide a use.
- the present invention has the following features.
- an antibody comprising a heavy chain variable region comprising SEQ ID NOs: 1, 2, and 3 and a light chain variable region comprising SEQ ID NOs: 4, 5, and 6, and having immunological reactivity with a CAPRIN-1 protein
- the present invention provides a pharmaceutical composition for treating and / or preventing cancer, comprising a fragment thereof as an active ingredient.
- the cancer is breast cancer, renal cancer, pancreatic cancer, colon cancer, lung cancer, brain cancer, stomach cancer, uterine cancer, ovarian cancer, prostate cancer, bladder cancer, esophageal cancer, leukemia, lymphoma, liver cancer, gallbladder cancer.
- the antibody is a human antibody, a humanized antibody, a chimeric antibody, a single chain antibody, or a multispecific antibody (eg, bispecific antibody).
- the antibody against CAPRIN-1 according to the present invention damages cancer cells. Therefore, the antibody against CAPRIN-1 according to the present invention is useful for the treatment and prevention of cancer.
- the antibody against CAPRIN-1 may be a monoclonal antibody or a polyclonal antibody, but is preferably a monoclonal antibody and may be any kind of antibody as long as it can exhibit antitumor activity, for example, Recombinant antibodies (eg, synthetic antibodies, multispecific antibodies (eg, bispecific antibodies), humanized antibodies, chimeric antibodies, single chain antibodies (scFv), etc.), human antibodies, antibody fragments thereof (eg, Fab, F (ab ′) 2 , Fv, etc.). These antibodies and fragments thereof can also be prepared by methods known to those skilled in the art. Moreover, when a test subject is a human, in order to avoid or suppress rejection, it is desirable that it is a human antibody or a humanized antibody.
- Recombinant antibodies eg, synthetic antibodies, multispecific antibodies (eg, bispecific antibodies), humanized antibodies, chimeric antibodies, single chain antibodies (scFv), etc.
- human antibodies antibody fragments thereof (eg, Fab, F (ab
- Specifically binds to CAPRIN-1 protein means that it specifically binds to CAPRIN-1 protein and does not substantially bind to other proteins.
- the subject who is the target of treatment and / or prevention of cancer in the present invention is a mammal such as a human, a pet animal, livestock, a sporting animal, etc., and a preferred subject is a human.
- the protein or fragment thereof used as a sensitizing antigen for obtaining an antibody against CAPRIN-1 according to the present invention is a human, dog, cat, cow, horse, mouse, rat, chicken, or other animal species derived from it. Not limited to. However, it is preferable to select in consideration of compatibility with the parent cell used for cell fusion. In general, a protein derived from a mammal is preferable, and a protein derived from a human is particularly preferable. For example, when CAPRIN-1 is human CAPRIN-1, human CAPRIN-1 protein, a partial peptide thereof, cells expressing human CAPRIN-1 and the like can be used.
- GenBank GenBank
- FASTA Altschul et al., Nucleic Acids Res. 25: 3389-3402, 1997.
- a nucleic acid or protein having a sequence identity of 5% to 100% becomes the target CAPRIN-1 (when the amino acid sequences of SEQ ID NO: 17 and SEQ ID NO: 19 are compared, the amino acid residues after position 690 are different.
- % sequence identity means that when two sequences are aligned (aligned) with the maximum similarity (or coincidence) with or without gaps, amino acids ( Or the percentage of the same amino acid (or base) relative to the total number of bases (including the number of gaps).
- the CAPRIN-1 protein fragment has a length less than the total length of the protein from the amino acid length of the epitope (antigenic determinant), which is the smallest unit recognized by the antibody.
- An epitope refers to a polypeptide fragment having antigenicity or immunogenicity in a mammal, preferably a human, and its minimum unit consists of about 7 to 12 amino acids, for example, 8 to 11 amino acids.
- polypeptide fragments containing human CAPRIN-1 protein and its partial peptides are synthesized according to chemical synthesis methods such as Fmoc method (fluorenylmethyloxycarbonyl method) and tBoc method (t-butyloxycarbonyl method), for example.
- Fmoc method fluorenylmethyloxycarbonyl method
- tBoc method t-butyloxycarbonyl method
- the polynucleotide encoding the above-mentioned polypeptide can be easily prepared by a known genetic engineering technique or a conventional method using a commercially available nucleic acid synthesizer.
- DNA containing the base sequence of the human CAPRIN-1 gene is prepared by performing PCR using a pair of primers designed to amplify the base sequence using human chromosomal DNA or cDNA library as a template. can do.
- PCR reaction conditions can be set as appropriate. For example, using a heat-resistant DNA polymerase (eg, Taq polymerase, Pfu polymerase, etc.) and a Mg 2+ -containing PCR buffer at 94 ° C. for 30 seconds (denaturation), at 55 ° C.
- a heat-resistant DNA polymerase eg, Taq polymerase, Pfu polymerase, etc.
- Mg 2+ -containing PCR buffer at 94 ° C. for 30 seconds (denaturation), at 55 ° C.
- a reaction process consisting of 30 seconds to 1 minute (annealing) and 2 minutes (elongation) at 72 ° C. is defined as one cycle.
- the conditions include a reaction for 7 minutes at 72 ° C. after 30 cycles. It is not limited to this.
- the PCR method, conditions, etc. see, for example, Ausubel et al., Short Protocols in Molecular Biology, 3rd edition, A compendium of Methods from Current Protocols in Molecular Biology (1995 & 1995). Has been.
- the cDNA library is preferably prepared from cells, organs or tissues expressing the CAPRIN-1 protein.
- Examples of such cells and tissues include testis, leukemia, breast cancer, lymphoma, brain tumor, lung cancer, pancreatic cancer, colon cancer, kidney cancer, stomach cancer, uterine cancer, ovarian cancer, prostate cancer, bladder cancer, esophageal cancer, Derived from a cancer or tumor such as sarcoma, mastocytoma, liver cancer, gallbladder cancer, melanoma, adrenocortical cancer, Ewing tumor, Hodgkin lymphoma, mesothelioma, multiple myeloma, testicular cancer, thyroid cancer or head and neck cancer A cell or tissue.
- a cancer or tumor such as sarcoma, mastocytoma, liver cancer, gallbladder cancer, melanoma, adrenocortical cancer, Ewing tumor, Hodgkin lymphoma, mesothelioma, multiple myeloma, testicular cancer, thyroid cancer or head and neck cancer A cell or tissue.
- the host cell into which the expression vector is introduced may be any cell as long as it can express the polypeptide.
- prokaryotic cells include Escherichia coli
- examples of eukaryotic cells include monkey kidney cells COS1.
- Mammalian cells such as Chinese hamster ovary cell CHO, human fetal kidney cell line HEK293, mouse embryonic skin cell line NIH3T3, budding yeast, yeast cells such as fission yeast, silkworm cells, Xenopus egg cells, etc. It is not limited.
- an expression vector having an origin, a promoter, a ribosome binding site, a multicloning site, a terminator, a drug resistance gene, an auxotrophic complementary gene, etc. that can be replicated in the prokaryotic cell is used.
- Examples of the expression vector for E. coli include pUC, pBluescript II, pET expression system, pGEX expression system and the like.
- an expression vector for a eukaryotic cell having a promoter, a splicing region, a poly (A) addition site and the like is used as an expression vector.
- expression vectors include pKA1, pCDM8, pSVK3, pMSG, pSVL, pBK-CMV, pBK-RSV, EBV vector, pRS, pcDNA3, pYES2, and the like.
- pIND / V5-His pFLAG-CMV-2, pEGFP-N1, pEGFP-C1, etc.
- a His tag for example, (His) 6 to (His) 10
- FLAG tag myc
- the polypeptide can be expressed as a fusion protein to which various tags such as a tag, HA tag, and GFP are added.
- the introduction of the expression vector into the host cell may be carried out using a well-known method such as electroporation, calcium phosphate method, liposome method, DEAE dextran method, microinjection, virus infection, lipofection, binding to a cell membrane-permeable peptide.
- the target polypeptide from the host cell can be performed by combining known separation operations. For example, treatment with denaturing agents and surfactants such as urea, ultrasonic treatment, enzyme digestion, salting out and solvent fractional precipitation, dialysis, centrifugation, ultrafiltration, gel filtration, SDS-PAGE, isoelectric focusing , Ion exchange chromatography, hydrophobic chromatography, affinity chromatography, reverse phase chromatography and the like, but are not limited thereto.
- denaturing agents and surfactants such as urea, ultrasonic treatment, enzyme digestion, salting out and solvent fractional precipitation, dialysis, centrifugation, ultrafiltration, gel filtration, SDS-PAGE, isoelectric focusing , Ion exchange chromatography, hydrophobic chromatography, affinity chromatography, reverse phase chromatography and the like, but are not limited thereto.
- the antigen prepared as described above can be used as a sensitizing antigen as described later.
- Antibodies are usually heteromultimeric glycoproteins containing at least two heavy chains and two light chains. Apart from IgM, immunoglobulins are approximately 150 kDa heterotetrameric glycoproteins composed of two identical light (L) chains and two identical heavy (H) chains. Typically, each light chain is linked to a heavy chain by one disulfide covalent bond, but the number of disulfide bonds varies between the heavy chains of different immunoglobulin isotypes. Each heavy and light chain also has an intrachain disulfide bond. Each heavy chain has at one end a variable domain (VH region) followed by several constant regions. Each light chain has a variable domain (VL region) and one constant region at the opposite end.
- VH region variable domain
- VL region variable domain
- the constant region of the light chain is aligned with the first constant region of the heavy chain, and the light chain variable domain is aligned with the variable domain of the heavy chain.
- the variable domain of an antibody confers binding specificity on the antibody, with certain regions exhibiting certain variability, termed complementarity determining regions (CDRs).
- CDRs complementarity determining regions
- a portion that is relatively stored in the variable area is called a framework area (FR).
- the complete heavy and light chain variable domains have a structure in which three complementarity-determining regions are linked by four framework regions, ie, FR1, CDR1, FR2, CDR2, FR3, CDR3, and FR4 in order from the N-terminus. Consists of a connected structure.
- CDRH1, CDRH2, and CDRH3 are called CDRH1, CDRH2, and CDRH3 in order from the N terminus in the heavy chain, and similarly CDRL1, CDRL2, and CDRL3 in the light chain.
- CDRH3 is most important for the binding specificity of the antibody to the antigen.
- the CDRs of each chain are held together in a state closer to the framework region, and contribute to the formation of an antigen binding site of the antibody together with the complementarity determining region derived from the other chain.
- the constant region does not contribute directly to the binding of the antibody to the antigen, but is involved in a variety of effector functions such as participation in antibody-dependent cellular cytotoxicity (ADCC), phagocytosis via binding to Fc ⁇ receptors ( ADCP), half-life / clearance rate via neonatal Fc receptor (FcRn), complement dependent cytotoxicity (CDC) via the C1q component of the complement cascade.
- ADCC antibody-dependent cellular cytotoxicity
- ADCP phagocytosis via binding to Fc ⁇ receptors
- FcRn half-life / clearance rate via neonatal Fc receptor
- CDC complement dependent cytotoxicity
- the anti-CAPRIN-1 antibody in the present invention means an antibody having immunological reactivity with the full length of a CAPRIN-1 protein or a fragment thereof.
- immunological reactivity means the property that an antibody binds to CAPRIN-1 antigen (full length of CAPRIN-1 protein or a partial polypeptide thereof) in vivo.
- the function of damaging (eg, killing, suppressing, or regressing) tumor cells through such binding of the antibody of the present invention to CAPRIN-1 is exhibited.
- the antibody of the present invention binds to a CAPRIN-1 protein and is used for tumors such as breast cancer, renal cancer, pancreatic cancer, colon cancer (for example, colon cancer), lung cancer, brain tumor, stomach cancer, uterine cancer, ovarian cancer, prostate cancer, Bladder cancer, esophageal cancer, leukemia, lymphoma, liver cancer, gallbladder cancer, sarcoma, mastocytoma, melanoma, adrenal cortex cancer, Ewing tumor, Hodgkin lymphoma, mesothelioma, multiple myeloma, testicular cancer, thyroid cancer or head and neck Can damage the cancer of the head.
- tumors such as breast cancer, renal cancer, pancreatic cancer, colon cancer (for example, colon cancer), lung cancer, brain tumor, stomach cancer, uterine cancer, ovarian cancer, prostate cancer, Bladder cancer, esophageal cancer, leukemia, lymphoma, liver cancer, gallbladder cancer, sarcoma,
- the antibody of the present invention is not particularly limited as long as it is preferably a monoclonal antibody, a synthetic antibody, a multispecific antibody (eg, diabody, triabody, etc.), a human antibody, a humanized antibody, a chimeric antibody, a single chain antibody, Antibody fragments (eg, Fab, F (ab ′) 2 , Fv) and the like are included.
- the antibody may be any class of immunoglobulin molecule, such as IgG, IgE, IgM, IgA, IgD, and IgY, or any subclass such as IgG1, IgG2, IgG3, IgG4, IgA1, IgA2, and the like.
- the antibody may be further modified by deglycosylation, acetylation, formylation, amidation, phosphorylation, PEGylation, or the like.
- a breast cancer cell line SK-BR-3 expressing CAPRIN-1 is administered to a mouse for immunization, the spleen is extracted from the mouse, the cells are separated, and the cells are fused with mouse myeloma cells. From the obtained fused cells (hybridomas), a clone producing an antibody having a cancer cell growth inhibitory action is selected.
- the antibody of the present invention can be prepared by isolating a monoclonal antibody-producing hybridoma having cancer cell growth inhibitory activity, culturing the hybridoma, and purifying the antibody from the culture supernatant by a general affinity purification method. is there.
- a hybridoma producing a monoclonal antibody can also be produced, for example, as follows.
- a sensitizing antigen is injected into a mammal intraperitoneally or subcutaneously.
- the sensitizing antigen is diluted to an appropriate amount with PBS (Phosphate-Buffered Saline), physiological saline, or the like, and then mixed with an appropriate amount of an ordinary adjuvant, for example, Freund's complete adjuvant, if necessary, and emulsified.
- an appropriate carrier can be used during immunization with the sensitizing antigen.
- immune cells are collected from the mammal and subjected to cell fusion. Can be mentioned.
- Mammalian myeloma cells are used as the other parent cell to be fused with the immune cells.
- the myeloma cells include various known cell lines such as P3U1 (P3-X63Ag8U1), P3 (P3x63Ag8.653) (J. Immunol. (1979) 123, 1548-1550), P3x63Ag8U. 1 (Current Topics in Microbiology and Immunology (1978) 81, 1-7), NS-1 (Kohler. G. and Milstein, C. Eur. J. Immunol. (1976) 6, 511-511) (Margulies.
- the cell fusion between the immune cells and myeloma cells is basically performed by a known method, for example, the method of Kohler and Milstein (Kohler, G. and Milstein, C. Methods Enzymol. (1981) 73, 3-46). It can carry out according to etc.
- the cell fusion is performed, for example, in a normal nutrient culture medium in the presence of a cell fusion promoter.
- a cell fusion promoter for example, polyethylene glycol (PEG), Sendai virus (HVJ) or the like is used, and an auxiliary agent such as dimethyl sulfoxide can be added and used to increase the fusion efficiency as desired.
- the usage ratio of immune cells and myeloma cells can be arbitrarily set.
- As the culture solution used for the cell fusion for example, RPMI1640 culture solution suitable for growth of the myeloma cell line, MEM culture solution, and other normal culture solutions used for this kind of cell culture can be used. Serum replacement fluid such as fetal calf serum (FCS) can be used in combination.
- FCS fetal calf serum
- a predetermined amount of the immune cells and myeloma cells are mixed well in the culture medium, and a PEG solution (for example, an average molecular weight of about 1000 to 6000) preliminarily heated to about 37 ° C. is usually 30 to 60%.
- the target hybridoma is formed by adding and mixing at a concentration of (w / v). Subsequently, it is preferable to remove cell fusion agents and the like which are undesirable for the growth of hybridomas by repeatedly adding an appropriate culture medium and centrifuging to remove the supernatant.
- the hybridoma thus obtained is selected by culturing in a normal selective culture solution, for example, a HAT culture solution (a culture solution containing hypoxanthine, aminopterin and thymidine). Culturing with the HAT culture solution is continued for a sufficient time (usually several days to several weeks) for cells other than the target hybridoma (non-fusion cells) to die. Subsequently, the usual limiting dilution method is performed, and the hybridoma producing the target antibody is screened and single-cloned.
- a normal selective culture solution for example, a HAT culture solution (a culture solution containing hypoxanthine, aminopterin and thymidine). Culturing with the HAT culture solution is continued for a sufficient time (usually several days to several weeks) for cells other than the target hybridoma (non-fusion cells) to die. Subsequently, the usual limiting dilution method is performed, and the hybridoma producing the target antibody is screened
- human lymphocytes such as human lymphocytes infected with EB virus are sensitized in vitro with proteins, protein-expressing cells or lysates thereof. It is also possible to obtain a hybridoma that produces a human antibody having a desired activity (for example, cell growth inhibitory activity) by fusing the lymphocytes with a myeloma cell having permanent mitotic activity derived from human, for example, U266 (registration number TIB196). it can.
- a desired activity for example, cell growth inhibitory activity
- the hybridoma producing the monoclonal antibody thus produced can be subcultured in a normal culture solution and can be stored for a long time in liquid nitrogen.
- a desired antigen or a cell that expresses the desired antigen is used as a sensitizing antigen, and this is immunized according to a normal immunization method, and the resulting immune cell is fused with a known parent cell by a normal cell fusion method. It can be prepared by screening monoclonal antibody-producing cells (hybridoma) by a normal screening method.
- the antigen can be prepared, for example, according to a method using animal cells (Special Table 2007-530068), a method using baculovirus (for example, International Publication No. WO 98/46777).
- immunization may be performed by binding to an immunogenic macromolecule such as albumin.
- the antigen may be immunized by administration with an adjuvant.
- the antibody of the present invention can also be obtained as a recombinant antibody produced by cloning the antibody gene from a hybridoma, incorporating it into an appropriate vector, introducing it into a host, and using a gene recombination technique.
- a gene recombination technique for example, Carl, AK Borrebaeck, James, W. Larrick, THERAPEUTIC MONOCLONAL ANTIBODIES, Published in the United KingdomISBL by 19M
- V region antibody variable region
- cDNA of an antibody variable region (V region) is synthesized from hybridoma mRNA using reverse transcriptase. If DNA encoding the V region of the target antibody is obtained, it is ligated with DNA encoding the desired antibody constant region (C region) and incorporated into an expression vector.
- DNA encoding the V region of the antibody may be incorporated into an expression vector containing DNA of the antibody C region. It is incorporated into an expression vector so as to be expressed under the control of an expression control region such as an enhancer or promoter.
- host cells can be transformed with this expression vector to express the antibody.
- the anti-CAPRIN-1 antibody of the present invention is preferably a monoclonal antibody, and examples of the monoclonal antibody include human monoclonal antibodies, non-human animal monoclonal antibodies (eg, mouse monoclonal antibodies, rat monoclonal antibodies, rabbits). Monoclonal antibodies, chicken monoclonal antibodies, etc.), chimeric monoclonal antibodies, and the like. Monoclonal antibodies are cultured hybridomas obtained by fusion of spleen cells and myeloma cells from non-human mammals (eg, mice, human antibody-producing mice, chickens, rabbits, etc.) immunized with the CAPRIN-1 protein or fragments thereof. Can be made.
- non-human mammals eg, mice, human antibody-producing mice, chickens, rabbits, etc.
- a chimeric antibody is an antibody produced by combining sequences derived from different animals, for example, an antibody comprising a mouse antibody heavy chain, light chain variable region and human antibody heavy chain, light chain constant region, and the like.
- a chimeric antibody can be prepared using a known method. For example, a DNA encoding an antibody V region and a DNA encoding a human antibody C region are ligated, incorporated into an expression vector, and introduced into a host. It is obtained by producing.
- a plurality of humanized monoclonal antibodies and human-rabbit chimeric monoclonal antibodies were produced, and a strong antitumor effect was confirmed.
- These monoclonal antibodies are all represented by the CDR1 represented by the amino acid sequence of SEQ ID NO: 1, the CDR2 represented by the amino acid sequence of SEQ ID NO: 2, and the amino acid sequence of SEQ ID NO: 3 in the heavy chain variable region (VH region).
- CDR3 comprising CDR3, CDR1 represented by the amino acid sequence of SEQ ID NO: 4, CDR2 represented by the amino acid sequence of SEQ ID NO: 5 and CDR3 represented by the amino acid sequence of SEQ ID NO: 6 in the light chain variable region (VL region) Including.
- These monoclonal antibodies are respectively humanized antibody # 0 comprising a VH region having the amino acid sequence of SEQ ID NO: 7 and a VL region having the amino acid sequence of SEQ ID NO: 11, a VH region having the amino acid sequence of SEQ ID NO: 8 and SEQ ID NO: 11.
- Humanized antibody # 1 consisting of VL region having amino acid sequence
- humanized antibody # 2 consisting of VH region having amino acid sequence of SEQ ID NO: 8 and VL region having amino acid sequence of SEQ ID NO: 12, amino acid sequence of SEQ ID NO: 8
- a humanized antibody # 3 comprising a VH region having the amino acid sequence of SEQ ID NO: 13 and a humanized antibody # 4 comprising a VH region having the amino acid sequence of SEQ ID NO: 7 and a VL region having the amino acid sequence of SEQ ID NO: 12
- Humanized antibody # 5 humanized antibody # 6 consisting of a VH region having the amino acid sequence of SEQ ID NO: 7 and a VL region having the amino acid sequence of SEQ ID NO: 15, VH region having the amino acid sequence of SEQ ID NO: 8 and SEQ ID NO: 15
- Humanized antibody # 7 consisting of VL region having amino acid sequence
- humanized antibody # 8 consisting of VH region having amino acid sequence of SEQ ID NO: 9 and VL region having amino acid sequence of SEQ ID NO: 15, amino acid sequence of SEQ ID NO: 10
- a humanized antibody # 9 comprising a VH region having the amino acid sequence of SEQ ID NO: 14 and a humanized antibody # 10 comprising a VH region having the amino acid sequence of SEQ ID NO: 10 and a VL region having the amino acid sequence of SEQ ID NO: 15
- a human comprising a VH region having the amino acid sequence of SEQ ID NO: 20 and a VL region having the amino acid sequence of SEQ ID NO: 21 Including the rabbit
- a humanized antibody is a modified antibody also called a reshaped human antibody.
- Humanized antibodies are constructed by transplanting the complementarity determining regions of antibodies derived from immunized animals into the complementarity determining regions of human antibodies. The general gene recombination technique is also known.
- a DNA sequence designed to link the complementarity determining region of a mouse antibody, rabbit antibody or chicken antibody and the framework region of a human antibody is prepared so as to have a portion overlapping the terminal portion. It is synthesized by PCR method from several oligonucleotides. The obtained DNA is obtained by ligating with the DNA encoding the human antibody constant region, then incorporating it into an expression vector, introducing it into a host and producing it (European Patent Application Publication No. EP239400, International Publication No. WO96). No. 02576).
- a region in which the complementarity determining region forms a favorable antigen binding site is selected.
- the amino acid of the framework region in the variable region of the antibody may be substituted so that the complementarity determining region of the reshaped human antibody forms an appropriate antigen binding site (Sato K. et al., Cancer Research). 1993, 53: 851-856). Moreover, you may substitute by the framework area
- variable region e.g, FR
- constant region amino acids in the variable region or constant region may be substituted with other amino acids.
- the amino acid substitution is one or more, for example, less than 15, less than 10, 8 or less, 7 or less, 6 or less, 5 or less, 4 or less, 3 or less, or 2 or less amino acids, preferably 1 to 9 amino acids.
- the substituted antibody should be functionally equivalent to the unsubstituted antibody.
- “functionally equivalent” means that the antibody of interest has the same biological or biochemical activity as the antibody of the present invention, specifically, a function of damaging a tumor, and when applied to humans. It means not to cause rejection. Examples of such activity include cell growth inhibitory activity or binding activity.
- a conservative amino acid substitution is a substitution between amino acids having similar properties such as charge, side chain, polarity, and aromaticity.
- Amino acids with similar properties include, for example, basic amino acids (arginine, lysine, histidine), acidic amino acids (aspartic acid, glutamic acid), uncharged polar amino acids (glycine, asparagine, glutamine, serine, threonine, cysteine, tyrosine), nonpolar It can be classified into sex amino acids (leucine, isoleucine, alanine, valine, proline, phenylalanine, tryptophan, methionine), branched chain amino acids (leucine, valine, isoleucine), aromatic amino acids (phenylalanine, tyrosine, tryptophan, histidine) and the like.
- modified antibody examples include antibodies bound to various molecules such as polyethylene glycol (PEG).
- PEG polyethylene glycol
- the substance to be bound is not limited. In order to obtain such a modified antibody, it can be obtained by chemically modifying the obtained antibody. These methods are already established in this field.
- an antibody that recognizes a CAPRIN-1 protein or a CAPRIN-1 fragment polypeptide containing the same can be obtained by methods known to those skilled in the art.
- the epitope of the CAPRIN-1 protein recognized by the anti-CAPRIN-1 antibody is determined by an ordinary method (for example, epitope mapping or the method for identifying an epitope described below), and a polymorph having an amino acid sequence contained in the epitope It can be obtained by a method of producing an antibody using a peptide as an immunogen, a method of determining an epitope of an antibody produced by a usual method, and selecting an antibody having the same epitope as the anti-CAPRIN-1 antibody.
- the antibody of the present invention is an antibody having immunological reactivity with CAPRIN-1, an antibody that specifically recognizes CAPRIN-1, or an antibody that specifically binds to CAPRIN-1, and has cytotoxic activity against cancer Or an antibody exhibiting tumor growth inhibitory action.
- the antibody is preferably an antibody having a structure such that little or no rejection is avoided in the subject animal to which it is administered. Examples of such antibodies include human antibodies, humanized antibodies, chimeric antibodies (eg, human-rabbit chimeric antibodies), single-chain antibodies, bispecific antibodies and the like when the target animal is human.
- These antibodies have a heavy chain and light chain variable region derived from a human antibody or a heavy chain and light chain variable region derived from a complementarity determining region derived from a non-human animal antibody (CDR1, CDR2 and CDR3). It consists of framework regions derived from human antibodies (FR1, FR2, FR3 and FR4), or the variable regions of heavy and light chains are derived from non-human animal antibodies, and heavy and light chains A recombinant antibody in which the constant region of the chain is derived from a human antibody. Preferred antibodies are the previous two antibodies.
- DNA encoding a monoclonal antibody against human CAPRIN-1 (for example, human monoclonal antibody, mouse monoclonal antibody, rat monoclonal antibody, rabbit monoclonal antibody, chicken monoclonal antibody, etc.) is cloned from antibody-producing cells such as hybridomas and used as a template.
- DNAs encoding the light chain variable region and heavy chain variable region of the antibody were prepared by RT-PCR method, etc., for example, Kabat EU numbering system (Kabat et al., Sequences of Proteins of Immunological, 5th Ed. Public. National Institute of Health, Bethesd , Md. (1991)), the sequence of each variable region, the sequence of each CDR1, CDR2, CDR3, or the sequence of each FR1, FR2, FR3, FR4 can be determined based on light chain and heavy chain .
- DNA encoding each of these variable regions or DNA encoding each complementarity-determining region is converted into a gene recombination technique (Sambrook et al., Molecular Cloning A Laboratory Manual, Cold Spring Laboratory Press (1989)) or a DNA synthesizer. It is produced using.
- the human monoclonal antibody-producing hybridoma is prepared by immunizing a human antibody-producing animal (eg, mouse) with human CAPRIN-1, and then fusing spleen cells excised from the immunized animal with myeloma cells. Can do.
- DNA encoding the variable region and constant region of the light chain or heavy chain derived from a human antibody is prepared as necessary using a gene recombination technique or a DNA synthesizer.
- the CDR coding sequence in the DNA encoding the light chain or heavy chain variable region derived from the human antibody is assigned to the corresponding non-human animal (eg, mouse, rat, rabbit, chicken). Etc.) by substituting the CDR coding sequence of the derived antibody, a DNA encoding the humanized antibody can be prepared.
- the variable regions are human FR1, mouse CDR1, human FR2, mouse CDR2, human FR3, mouse from the N-terminal side. It is composed of CDR4 and human FR4 in this order.
- a chimeric antibody the DNA encoding the variable region of the light chain or heavy chain of an antibody derived from a non-human animal (eg, mouse, rat, rabbit, chicken, etc.) is respectively added to the light chain or heavy chain derived from a human antibody.
- a DNA encoding a chimeric antibody can be prepared by ligating with a DNA encoding the constant region of the chain.
- this antibody is an antibody in which a heavy chain variable region and a light chain variable region are linearly linked via a linker, DNA encoding the heavy chain variable region, DNA encoding the linker And a DNA encoding a light chain variable region can be combined to produce a DNA encoding a single chain antibody.
- each of the heavy chain variable region and the light chain variable region is derived from a human antibody, or only the complementarity determining region is derived from an animal other than human (eg, mouse, rat, rabbit, chicken, etc.). It is derived from a human antibody substituted by the complementarity determining region of the antibody.
- the linker is composed of 12 to 19 amino acids, and examples thereof include 15 amino acids (G 4 S) 3 (G.-B. Kim et al., Protein Engineering Design and Selection 2007, 20 (9): 425-432). It is done.
- this antibody is an antibody that can specifically bind to two different epitopes, eg, DNA encoding heavy chain variable region A, light chain variable region B , DNA encoding heavy chain variable region B, and DNA encoding light chain variable region A are joined in this order (however, DNA encoding light chain variable region B and heavy chain variable region B are combined).
- the DNA that encodes the bispecific antibody can be prepared by binding to the DNA encoding through the DNA encoding the linker as described above.
- each of the heavy chain variable region and the light chain variable region is derived from a human antibody, or only the complementarity determining region is derived from an animal other than human (eg, mouse, rat, rabbit, chicken, etc.). It is derived from a human antibody substituted by the complementarity determining region of the antibody.
- Recombinant DNA prepared as described above is incorporated into one or more appropriate vectors, introduced into host cells (eg, mammalian cells, yeast cells, insect cells, etc.), and (co) expressed
- host cells eg, mammalian cells, yeast cells, insect cells, etc.
- a recombinant antibody can be prepared (PJ Delves., ANTIBODY PRODUCTION ESSENTIAL TECHNIQUES., 1997 WILEY, P. Shepherd and C. Dean. SNT. W. Gododing., Monoclonal Antibodies: principals and practices., 1993 Academic PRESS).
- Examples of the antibody of the present invention produced by the above method include a heavy chain variable region comprising SEQ ID NOs: 1, 2 and 3 and a light chain variable region comprising SEQ ID NOs: 4, 5 and 6 obtained in Examples described later.
- the humanized antibody, chimeric antibody, single chain antibody or bispecific antibody of the present invention is, for example, the following antibodies (i) to (xiv).
- variable region of the heavy chain includes the amino acid sequences of SEQ ID NOs: 1, 2, and 3 and the amino acid sequence of the framework region derived from a human antibody or a substitution thereof
- variable region of the light chain includes SEQ ID NOs: 4, 5 And an amino acid sequence of 6 and a framework region amino acid sequence derived from a human antibody or a substitution thereof.
- variable region of the heavy chain includes the amino acid sequences of SEQ ID NOs: 1, 2, and 3 and the amino acid sequence of the framework region derived from a human antibody or a substitution thereof, and the constant region of the heavy chain is an amino acid derived from a human antibody
- the light chain variable region includes the amino acid sequence of SEQ ID NOs: 4, 5 and 6 and the amino acid sequence of the framework region derived from a human antibody or a substitution thereof, and the constant region of the light chain is a human antibody.
- An antibody comprising an amino acid sequence derived therefrom.
- variable region of the heavy chain comprises the amino acid sequence of SEQ ID NO: 8
- the constant region of the heavy chain comprises the amino acid sequence derived from a human antibody
- variable region of the light chain comprises the amino acid sequence of SEQ ID NO: 15.
- An antibody comprising a light chain constant region comprising an amino acid sequence derived from a human antibody.
- variable region of the heavy chain includes the amino acid sequence of SEQ ID NO: 10
- constant region of the heavy chain includes the amino acid sequence derived from a human antibody
- variable region of the light chain includes the amino acid sequence of SEQ ID NO: 15.
- An antibody comprising a light chain constant region comprising an amino acid sequence derived from a human antibody.
- variable region of the heavy chain includes the amino acid sequence of SEQ ID NO: 7
- constant region of the heavy chain includes the amino acid sequence derived from a human antibody
- variable region of the light chain includes the amino acid sequence of SEQ ID NO: 15.
- An antibody comprising a light chain constant region comprising an amino acid sequence derived from a human antibody.
- variable region of the heavy chain comprises the amino acid sequence of SEQ ID NO: 8
- the constant region of the heavy chain comprises the amino acid sequence derived from a human antibody
- variable region of the light chain comprises the amino acid sequence of SEQ ID NO: 13.
- An antibody comprising a light chain constant region comprising an amino acid sequence derived from a human antibody.
- variable region of the heavy chain comprises the amino acid sequence of SEQ ID NO: 7
- constant region of the heavy chain comprises the amino acid sequence derived from a human antibody
- variable region of the light chain comprises the amino acid sequence of SEQ ID NO: 12.
- An antibody comprising a light chain constant region comprising an amino acid sequence derived from a human antibody.
- variable region of the heavy chain comprises the amino acid sequence of SEQ ID NO: 8
- the constant region of the heavy chain comprises the amino acid sequence derived from a human antibody
- variable region of the light chain comprises the amino acid sequence of SEQ ID NO: 12.
- An antibody comprising a light chain constant region comprising an amino acid sequence derived from a human antibody.
- variable region of the heavy chain includes the amino acid sequence of SEQ ID NO: 7
- constant region of the heavy chain includes the amino acid sequence derived from a human antibody
- variable region of the light chain includes the amino acid sequence of SEQ ID NO: 13.
- An antibody comprising a light chain constant region comprising an amino acid sequence derived from a human antibody.
- variable region of the heavy chain comprises the amino acid sequence of SEQ ID NO: 10
- constant region of the heavy chain comprises the amino acid sequence derived from a human antibody
- variable region of the light chain comprises the amino acid sequence of SEQ ID NO: 14.
- An antibody comprising a light chain constant region comprising an amino acid sequence derived from a human antibody.
- variable region of the heavy chain comprises the amino acid sequence of SEQ ID NO: 8
- the constant region of the heavy chain comprises the amino acid sequence derived from a human antibody
- variable region of the light chain comprises the amino acid sequence of SEQ ID NO: 11.
- An antibody comprising a light chain constant region comprising an amino acid sequence derived from a human antibody.
- variable region of the heavy chain includes the amino acid sequence of SEQ ID NO: 7
- constant region of the heavy chain includes the amino acid sequence derived from a human antibody
- variable region of the light chain includes the amino acid sequence of SEQ ID NO: 11.
- An antibody comprising a light chain constant region comprising an amino acid sequence derived from a human antibody.
- variable region of the heavy chain comprises the amino acid sequence of SEQ ID NO: 9
- constant region of the heavy chain comprises the amino acid sequence derived from a human antibody
- variable region of the light chain comprises the amino acid sequence of SEQ ID NO: 15.
- An antibody comprising a light chain constant region comprising an amino acid sequence derived from a human antibody.
- variable region of the heavy chain comprises the amino acid sequence of SEQ ID NO: 20
- the constant region of the heavy chain comprises the amino acid sequence derived from a human antibody
- the variable region of the light chain comprises the amino acid sequence of SEQ ID NO: 21
- An antibody comprising a light chain constant region comprising an amino acid sequence derived from a human antibody.
- sequences of the human antibody heavy chain and light chain constant regions and variable region framework regions are available from, for example, NCBI (US: GenBank, UniGene, etc.).
- NCBI GenBank, UniGene, etc.
- sequences such as registration numbers X64132, X64134 can be referred to.
- the above antibody preferably has cytotoxic activity, and can thereby exert an antitumor effect (or antitumor activity).
- the complementarity determining region sequence, the framework region sequence and / or the constant region sequence of each antibody has one or several There may be amino acid substitutions, deletions or additions.
- the term “several” means preferably 1 to 9.
- the affinity constant Ka (k on / k off ) of the antibody of the invention for the CAPRIN-1 protein or fragment thereof is preferably at least 5 ⁇ 10 8 M ⁇ 1 , at least 10 9 M ⁇ 1 , at least 5 ⁇ 10. 9 M ⁇ 1 , at least 10 10 M ⁇ 1 , at least 5 ⁇ 10 10 M ⁇ 1 , at least 10 11 M ⁇ 1 , at least 5 ⁇ 10 11 M ⁇ 1 , at least 10 12 M ⁇ 1 , at least 10 13 M ⁇ 1 Or at least 10 14 M ⁇ 1 .
- ADCC effector cell antibody-dependent cytotoxicity
- the antibody from which fucose bound to N-acetylglucosamine in the N-glycoside-linked sugar chain bound to the heavy chain constant region is removed may be used alone or fucose is bound thereto. It may be a composition with the antibody in question. In the antibody composition, an antibody from which fucose has been removed is preferably the main component.
- Antibodies in which one or several amino acids in the heavy chain constant region are substituted include, for example, International Publication No. WO2004 / 063511, International Publication No. WO2011 / 120135, US Pat. No. 8,388,955, International Publication No. WO2011 / 005481, US Pat. No. 6,737,056. And International Publication No. WO2005 / 066351.
- An antibody from which fucose added to N-acetylglucosamine in an N-glycoside-linked sugar chain in the heavy chain constant region is removed or a production cell thereof is disclosed in, for example, US Pat. No. 6,602,684, European Patent 191244, and US Pat. No. 7,579,170. It can produce with reference to.
- the antibody of the present invention can be conjugated with an antitumor agent.
- the bond between the antibody and the antitumor agent is a group reactive with an amino group, carboxyl group, hydroxy group, thiol group, etc. (for example, succinate imidyl group, formyl group, 2-pyridyldithio group, maleimidyl group, alkoxycarbonyl group). , A hydroxy group, etc.).
- antitumor agents include the following antitumor agents known in the literature, such as paclitaxel, doxorubicin, daunorubicin, cyclophosphamide, methotrexate, 5-fluorouracil, thiotepa, busulfan, improsulfan, piperosulfan, benzodopa (benzodopa) ), Carbocone, methredopa, uredopa, uretopa, altreamine, triethylenemelamine, triethylenephosphoramide, triethylenethiophosphoramide, trimethylolothramine , Camptothecin, bryostatin, calistatin ( allystatin), cryptophycin 1, cryptophycin 8, dolastatin, duocarmycin, eleuterbin, panclastatin, sarcodictin, spongestatin, chlorambucil, chloronaphazine, cholophosphamide, estram Ifosfamide, mechlore
- a method for evaluating whether it exhibits antitumor activity is, for example, a mouse-derived anti-CAPRIN-1 antibody, which binds to a mouse antibody.
- the anti-tumor effect against human cancer cells can be evaluated in vitro by reacting the next antibody with a drug at the same time. For example, it can be evaluated using anti-human IgG antibody antibody (Hum-ZAP (Advanced Targeting Systems)), which is a second immunotoxin to which saporin is bound.
- a higher therapeutic effect can be obtained by co-administering the antibody of the present invention and an antitumor agent.
- This technique can be applied to cancer patients expressing CAPRIN-1 either before or after surgery. In particular, after surgery, cancer recurrence and longer survival can be obtained for cancers expressing CAPRIN-1, which have been treated with an antitumor agent alone.
- the antitumor agent used for the combined administration with the antibody of the present invention for example, can be used.
- the antitumor agent can be used.
- cyclophosphamide, paclitaxel, doxetaxel and vinorelbine are preferably used.
- the antibodies of the present invention include 211 At, 131 I, 125 I, 90 Y, 186 Re, 188 Re, 153 SM, 212 Bi, 32 P, 175 Lu, 176 Lu, 89 Sr, which are well known in the literature. It is also possible to combine radioisotopes such as 64 Cu and 111 In (Hideo Sagi, YAKUGAKU ZASSHI 128 (3) 323-332 8 (2008), Jpn). It is desirable that the radioisotope is effective for tumor treatment and diagnosis. Such a radioisotope is also included in the antitumor agent in the present invention.
- the anti-tumor effect on CAPRIN-1-expressing cancer cells by the anti-CAPRIN-1 antibody used in the present invention is considered to occur by the following mechanism, etc .: Effector cell antibody-dependent cytotoxicity of the aforementioned CAPRIN-1-expressing cells (ADCC) and antibody-dependent cellular phagocytosis (ADCP) of CAPRIN-1-expressing cells.
- ADCC CAPRIN-1-expressing cells
- ADCP antibody-dependent cellular phagocytosis
- the activity of the anti-CAPRIN-1 antibody used in the present invention is evaluated in vitro by the above ADCC activity or ADCP activity against cancer cells expressing CAPRIN-1, as specifically shown in the Examples below. It can be evaluated by measuring.
- the anti-CAPRIN-1 antibody used in the present invention binds to the CAPRIN-1 protein on cancer cells and exhibits an antitumor action due to the above activity and the like, and is thus considered useful for the treatment or prevention of cancer. That is, the present invention provides a pharmaceutical composition for treating and / or preventing cancer comprising an anti-CAPRIN-1 antibody as an active ingredient.
- the anti-CAPRIN-1 antibody is used for the purpose of administering it to the human body (antibody treatment), it is preferable to use a human antibody or a humanized antibody in order to reduce immunogenicity.
- the antibody of the present invention has a high binding affinity with the CAPRIN-1 protein, it can be expected to have a stronger antitumor effect and can be applied as a pharmaceutical composition for the purpose of cancer treatment and / or prevention. become.
- the antibody of the present invention has a binding constant (affinity constant) Ka (k on / k off ) of preferably at least 5 ⁇ 10 8 M ⁇ 1 , at least 10 9 M ⁇ as high binding affinity.
- ⁇ Binding to antigen-expressing cells The ability of an antibody to bind to CAPRIN-1 can be identified using binding assays such as those described in the Examples, eg, ELISA, Western blot, immunofluorescence and flow cytometry analysis. .
- Antibodies that recognize CAPRIN-1 can be used in immunohistochemistry in a manner well known to those skilled in the art. For example, tissue obtained from a patient during surgery or tissue obtained from an animal carrying a xenograft tissue inoculated with a cell line expressing CAPRIN-1 either naturally or after transfection is fixed with paraformaldehyde or acetone. Frozen sections obtained in this manner or paraffin-embedded tissue sections fixed with paraformaldehyde can be used to test for reactivity with CAPRIN-1.
- an antibody reactive to CAPRIN-1 can be stained by various methods. For example, it can be visualized by reacting horseradish peroxidase-conjugated goat anti-mouse antibody, goat anti-rabbit antibody or goat anti-chicken antibody.
- the target of the pharmaceutical composition for the treatment and / or prevention of cancer of the present invention is not particularly limited as long as it is a cancer (cell) expressing the CAPRIN-1 gene.
- tumor and cancer refer to malignant neoplasms and are used interchangeably.
- the cancer targeted in the present invention may be any cancer as long as it expresses the CAPRIN-1 protein on the cell membrane surface.
- the cancer is, for example, breast cancer, complex breast cancer, malignant mixed breast tumor, intraductal papillary adenocarcinoma, lung adenocarcinoma, squamous cell carcinoma, small cell carcinoma, large cell carcinoma, neuroepithelium Glioma, glioblastoma, neuroblastoma, ventricular ependymoma, neuronal tumor, fetal neuroectodermal tumor, schwannoma, neurofibroma, meningioma, chronic type Lymphocytic leukemia, gastrointestinal lymphoma, gastrointestinal lymphoma, small to medium cell lymphoma, cecal cancer, ascending colon cancer, descending colon cancer, transverse colon cancer, sigmoid colon cancer, rectal cancer, ovarian epithelial cancer, embryo Cell tumor, stromal cell tumor, pancreatic duct cancer, invasive pancreatic duct cancer, adenocarcinoma of pancreatic cancer, acinar cell carcinoma
- preferred subjects (patients) to be targeted are mammals, for example, mammals including primates, pet animals, livestock, sport animals, etc., and humans, dogs and cats are particularly preferable.
- the antibody used in the present invention when used as a pharmaceutical composition, it can be formulated by methods known to those skilled in the art. For example, it can be used parenterally in the form of a sterile solution with water or other pharmaceutically acceptable liquid, or an injection of suspension.
- a pharmacologically acceptable carrier or medium specifically, sterile water or physiological saline, vegetable oil, emulsifier, suspension agent, surfactant, stabilizer, flavoring agent, excipient, vehicle, preservative
- a pharmaceutical preparation by combining with a binder or the like as appropriate and mixing in a unit dosage form generally required for pharmaceutical practice. The amount of active ingredient in these preparations is such that an appropriate dose within the indicated range can be obtained.
- a sterile composition for injection can be formulated in accordance with normal pharmaceutical practice using a vehicle such as distilled water for injection.
- Aqueous solutions for injection include, for example, isotonic solutions containing physiological saline, glucose and other adjuvants such as D-sorbitol, D-mannose, D-mannitol and sodium chloride.
- isotonic solutions containing physiological saline, glucose and other adjuvants such as D-sorbitol, D-mannose, D-mannitol and sodium chloride.
- alcohols specifically ethanol, polyalcohols such as propylene glycol, polyethylene glycol, nonionic surfactants such as polysorbate 80 (TM), HCO-60 may be used in combination.
- oily liquid examples include sesame oil and soybean oil, which may be used in combination with benzyl benzoate or benzyl alcohol as a solubilizing agent.
- oily liquid examples include sesame oil and soybean oil, which may be used in combination with benzyl benzoate or benzyl alcohol as a solubilizing agent.
- blend with buffer for example, phosphate buffer, sodium acetate buffer, soothing agent, for example, procaine hydrochloride, stabilizer, for example, benzyl alcohol, phenol, antioxidant.
- buffer for example, phosphate buffer, sodium acetate buffer
- soothing agent for example, procaine hydrochloride
- stabilizer for example, benzyl alcohol, phenol, antioxidant.
- the prepared injection solution is usually filled into a suitable ampoule.
- Administration is oral or parenteral, preferably parenteral administration. Specific examples include injection, nasal administration, pulmonary administration, and transdermal administration. As an example of the injection form, it can be administered systemically or locally by, for example, intravenous injection, intramuscular injection, intraperitoneal injection, subcutaneous injection, or the like.
- the administration method can be appropriately selected depending on the age, weight, sex, symptoms, etc. of the patient.
- the dosage of the pharmaceutical composition containing the antibody or the polynucleotide encoding the antibody can be selected, for example, in the range of 0.0001 mg to 1000 mg per kg body weight. Alternatively, for example, the dose can be selected in the range of 0.001 to 100,000 mg / body per patient, but is not necessarily limited to these values.
- the dose and administration method vary depending on the patient's weight, age, sex, symptom, etc., but can be appropriately selected by those skilled in the art.
- Cancer preferably breast cancer, kidney cancer, pancreatic cancer, colon cancer, lung cancer, brain tumor, stomach cancer, uterine cancer, ovarian cancer, prostate, by administering to a subject the above pharmaceutical composition comprising the antibody of the present invention or a fragment thereof Cancer, bladder cancer, esophageal cancer, leukemia, lymphoma, liver cancer, gallbladder cancer, sarcoma, mastocytoma, melanoma, adrenocortical cancer, Ewing tumor, Hodgkin lymphoma, mesothelioma, multiple myeloma, testicular cancer, thyroid cancer Or head and neck cancer can be treated and / or prevented.
- a method for treating and / or preventing cancer comprising administering the pharmaceutical composition of the present invention to a subject in combination with an antitumor agent or a pharmaceutical composition containing an antitumor agent as exemplified above.
- the antibody or fragment thereof of the present invention and the antitumor agent can be administered to a subject simultaneously or separately.
- any pharmaceutical composition may be earlier or later, and the administration interval, dosage, administration route and frequency of administration can be appropriately selected by a specialist.
- a pharmaceutical composition in the form of a pharmaceutical preparation obtained by mixing the antibody of the present invention or a fragment thereof and an antitumor agent in a pharmacologically acceptable carrier (or medium) and preparing a formulation is also included.
- a pharmaceutical composition in the form of a pharmaceutical preparation obtained by mixing the antibody of the present invention or a fragment thereof and an antitumor agent in a pharmacologically acceptable carrier (or medium) and preparing a formulation is also included.
- a pharmaceutical compositions and dosage forms containing an antitumor agent the formulation, formulation, administration route, dose, cancer, etc. for the pharmaceutical composition and dosage form containing the antibody of the present invention The explanation can be applied.
- the present invention provides a pharmaceutical combination for the treatment and / or prevention of cancer comprising the pharmaceutical composition of the present invention and a pharmaceutical composition comprising an antitumor agent as exemplified above, and administering the same
- a method for treating and / or preventing cancer is also provided.
- the present invention also provides a pharmaceutical composition for treating and / or preventing cancer comprising the antibody of the present invention or a fragment thereof and an antitumor agent together with a pharmacologically acceptable carrier.
- the present invention further provides DNA encoding the antibody of the present invention, DNA encoding the heavy chain or light chain of the antibody, or DNA encoding the variable region of the heavy chain or light chain of the antibody.
- DNA is, for example, in the case of antibody (a), a DNA encoding a heavy chain variable region comprising a base sequence encoding the amino acid sequences of SEQ ID NOs: 1, 2 and 3, and the amino acid sequences of SEQ ID NOs: 4, 5 and 6 DNA encoding a light chain variable region containing a nucleotide sequence encoding
- sequences encoding the other regions of the antibody are the other regions.
- the sequence may be derived from an antibody.
- other antibodies include antibodies derived from organisms other than humans, but those derived from humans are preferable from the viewpoint of reducing side effects. That is, in the above DNA, the regions encoding the heavy chain and light chain framework regions and the constant regions preferably include a base sequence encoding a corresponding amino acid sequence derived from a human antibody.
- DNA encoding the antibody of the present invention is, for example, a DNA encoding a heavy chain variable region comprising a base sequence encoding the amino acid sequence of SEQ ID NO: 8, and a region encoding the light chain variable region is SEQ ID NO:
- DNA containing a nucleotide sequence encoding 15 amino acid sequences is the base sequence of SEQ ID NO: 23.
- An example of the base sequence encoding the amino acid sequence of SEQ ID NO: 15 is the base sequence of SEQ ID NO: 30.
- the region encoding each heavy chain and light chain constant region includes a base sequence encoding a corresponding amino acid sequence derived from a human antibody.
- the DNA of these antibodies can be obtained, for example, by the above method or the following method.
- total RNA is prepared from a hybridoma related to the antibody of the present invention using a commercially available RNA extraction kit, and cDNA is synthesized by reverse transcriptase using a random primer or the like.
- the cDNA encoding the antibody is amplified by a PCR method using oligonucleotides having conserved sequences as primers.
- the sequence encoding the constant region can be obtained by amplifying a known sequence by the PCR method.
- the base sequence of DNA can be determined by a conventional method by incorporating it into a sequencing plasmid or phage.
- the present invention further provides the polypeptides and DNAs described in the following (i) to (xv) related to the antibodies (i) to (xiv).
- a polypeptide comprising the amino acid sequences of SEQ ID NO: 8 and SEQ ID NO: 15 and a DNA encoding the polypeptide, for example, a DNA comprising the nucleotide sequences of SEQ ID NO: 23 and SEQ ID NO: 30.
- a polypeptide comprising the amino acid sequences of SEQ ID NO: 10 and SEQ ID NO: 15 and a DNA encoding the polypeptide, for example, a DNA comprising the nucleotide sequences of SEQ ID NO: 25 and SEQ ID NO: 30.
- V a polypeptide comprising the amino acid sequences of SEQ ID NO: 7 and SEQ ID NO: 15 and a DNA encoding the polypeptide, for example, a DNA comprising the nucleotide sequences of SEQ ID NO: 22 and SEQ ID NO: 30.
- a polypeptide comprising the amino acid sequences of SEQ ID NO: 8 and SEQ ID NO: 13 and a DNA encoding the polypeptide, for example, a DNA comprising the nucleotide sequences of SEQ ID NO: 23 and SEQ ID NO: 28.
- a polypeptide comprising the amino acid sequence of SEQ ID NO: 7 and SEQ ID NO: 12 and a DNA encoding the polypeptide, for example, a DNA comprising the nucleotide sequence of SEQ ID NO: 22 and SEQ ID NO: 27.
- a polypeptide comprising the amino acid sequences of SEQ ID NO: 8 and SEQ ID NO: 12 and a DNA encoding the polypeptide, for example, a DNA comprising the nucleotide sequences of SEQ ID NO: 23 and SEQ ID NO: 27.
- a polypeptide comprising the amino acid sequences of SEQ ID NO: 7 and SEQ ID NO: 13 and a DNA encoding the polypeptide, for example, a DNA comprising the nucleotide sequences of SEQ ID NO: 22 and SEQ ID NO: 28.
- (X) a polypeptide comprising the amino acid sequences of SEQ ID NO: 10 and SEQ ID NO: 14 and a DNA encoding the polypeptide, for example, a DNA comprising the nucleotide sequences of SEQ ID NO: 25 and SEQ ID NO: 29.
- a polypeptide comprising the amino acid sequences of SEQ ID NO: 8 and SEQ ID NO: 11 and a DNA encoding the polypeptide, for example, a DNA comprising the nucleotide sequences of SEQ ID NO: 23 and SEQ ID NO: 26.
- Xii a polypeptide comprising the amino acid sequences of SEQ ID NO: 7 and SEQ ID NO: 11 and a DNA encoding the polypeptide, for example, a DNA comprising the nucleotide sequences of SEQ ID NO: 22 and SEQ ID NO: 26.
- polypeptide comprising the amino acid sequences of SEQ ID NO: 9 and SEQ ID NO: 15 and a DNA encoding the polypeptide, for example, a DNA comprising the nucleotide sequences of SEQ ID NO: 24 and SEQ ID NO: 30.
- a polypeptide comprising the amino acid sequences of SEQ ID NO: 20 and SEQ ID NO: 21 and a DNA encoding the polypeptide, for example, a DNA comprising the nucleotide sequences of SEQ ID NO: 31 and SEQ ID NO: 32.
- polypeptides and DNA can be prepared using genetic recombination techniques as described above.
- a heavy chain variable region comprising the complementarity determining regions of SEQ ID NOs: 1, 2, and 3 and a light chain variable region comprising the complementarity determining regions of SEQ ID NOs: 4, 5, and 6, and a CAPRIN-1 protein
- variable region of the heavy chain comprises the amino acid sequence of SEQ ID NO: 8
- variable region of the light chain comprises the amino acid sequence of SEQ ID NO: 15.
- variable region of the heavy chain comprises the amino acid sequence of SEQ ID NO: 10
- variable region of the light chain comprises the amino acid sequence of SEQ ID NO: 15.
- variable region of the heavy chain comprises the amino acid sequence of SEQ ID NO: 7
- variable region of the light chain comprises the amino acid sequence of SEQ ID NO: 15.
- variable region of the heavy chain comprises the amino acid sequence of SEQ ID NO: 8
- variable region of the light chain comprises the amino acid sequence of SEQ ID NO: 13.
- variable region of the heavy chain comprises the amino acid sequence of SEQ ID NO: 7
- variable region of the light chain comprises the amino acid sequence of SEQ ID NO: 12.
- variable region of the heavy chain comprises the amino acid sequence of SEQ ID NO: 8
- variable region of the light chain comprises the amino acid sequence of SEQ ID NO: 12.
- variable region of the heavy chain comprises the amino acid sequence of SEQ ID NO: 7
- variable region of the light chain comprises the amino acid sequence of SEQ ID NO: 13.
- variable region of the heavy chain comprises the amino acid sequence of SEQ ID NO: 10
- variable region of the light chain comprises the amino acid sequence of SEQ ID NO: 14.
- variable region of the heavy chain comprises the amino acid sequence of SEQ ID NO: 8
- variable region of the light chain comprises the amino acid sequence of SEQ ID NO: 11.
- variable region of the heavy chain comprises the amino acid sequence of SEQ ID NO: 7
- variable region of the light chain comprises the amino acid sequence of SEQ ID NO: 11.
- variable region of the heavy chain comprises the amino acid sequence of SEQ ID NO: 9
- variable region of the light chain comprises the amino acid sequence of SEQ ID NO: 15.
- variable region of the heavy chain comprises the amino acid sequence of SEQ ID NO: 20
- variable region of the light chain comprises the amino acid sequence of SEQ ID NO: 21.
- a pharmaceutical composition for the treatment and / or prevention of cancer comprising:
- the cancer is breast cancer, renal cancer, pancreatic cancer, colon cancer, lung cancer, brain tumor, stomach cancer, uterine cancer, ovarian cancer, prostate cancer, bladder cancer, esophageal cancer, leukemia, lymphoma, liver cancer, gallbladder cancer, sarcoma,
- the pharmaceutical composition according to (20) which is mastocytoma, melanoma, adrenocortical cancer, Ewing tumor, Hodgkin lymphoma, mesothelioma, multiple myeloma, testicular cancer, thyroid cancer, or head and neck cancer.
- a combined pharmaceutical for treatment and / or prevention of cancer comprising the pharmaceutical composition according to (20) or (21) and a pharmaceutical composition containing an antitumor agent.
- the antibody or fragment thereof according to any one of (1) to (16), the antibody according to (17), the composition of the antibody according to (18), or the antibody according to (20) or (21) A method for treating and / or preventing cancer, comprising administering to a subject a pharmaceutical composition or the combination pharmaceutical according to (22).
- Example 1 Production of Anti-CAPRIN-1 Monoclonal Antibody Using Rabbit 300 ⁇ g of human CAPRIN-1 protein prepared in Example 3 of WO2010 / 016526 was mixed with an equal volume of Freund's complete adjuvant, and this was per rabbit. An antigen solution was used. In the second and subsequent immunizations, those mixed with incomplete adjuvant with Frein were used. Immunization was completed by administering the antigen solution into the abdominal cavity of a 12-week-old rabbit 8 times every 2-3 weeks. Lymphocytes were obtained from each spleen removed 4 days after the last immunization, mixed with rabbit myeloma cells 240E-W2 at a ratio of 1: 2, and then RPMI containing 10% FBS heated to 37 ° C.
- RPMI medium HAT selective medium
- Hybridomas were selected using the reactivity of the antibody produced by the prepared hybridomas to the CAPRIN-1 protein as an index.
- 100 ⁇ L of CAPRIN-1 protein solution 1 ⁇ g / mL was added per well of a 96-well plate, and the plate was allowed to stand at 4 ° C. for 18 hours.
- 400 ⁇ L of 0.5% Bovine Serum Albumin (BSA) solution was added per well and allowed to stand at room temperature for 3 hours.
- BSA Bovine Serum Albumin
- hybridomas were added to the plate so that the number was 0.5 per well of the 96-well plate and cultured. One week later, hybridomas forming a single colony in the well were observed. The cells in these wells were further cultured, and hybridomas were selected using the reactivity of antibodies produced by the cloned hybridomas with the CAPRIN-1 protein as an index. As a result of evaluating the reactivity of each antibody to the CAPRIN-1 protein by the same operation as described above, a plurality of hybridoma strains producing a rabbit monoclonal antibody reactive to the CAPRIN-1 protein were obtained.
- the resulting rabbit anti-CAPRIN-1 monoclonal antibody has the heavy chain variable region shown in SEQ ID NO: 20 and CDRs 1 to 3 in the heavy chain variable region from the amino acid sequences of SEQ ID NO: 1, SEQ ID NO: 2, and SEQ ID NO: 3, respectively.
- the light chain variable region shown in SEQ ID NO: 21 and CDRs 1 to 3 in the light chain variable region consist of the amino acid sequences of SEQ ID NO: 4, SEQ ID NO: 5, and SEQ ID NO: 6, respectively.
- Microcentrifuge tube 1.5mL volume collected Kakugan cells to 10 6, respectively, were added the culture supernatant of hybridomas producing rabbit anti caprin-1 monoclonal antibody obtained above a (100 [mu] L) to each tube, The reaction was carried out at 4 ° C. for 1 hour. After washing with 0.5% FBS-PBS ( ⁇ ), a FITC-labeled goat anti-rabbit IgG (H + L) antibody (Jackson ImmunoResearch) diluted 50-fold with 0.5% FBS-PBS ( ⁇ ) was added. It left still at 4 degreeC for 60 minutes.
- the cells After washing with 0.5% FBS-PBS ( ⁇ ), the cells were suspended in 0.5% FBS-PBS ( ⁇ ) containing Propium iodide at a final concentration of 0.2 ⁇ g / mL, and FACSCalibur TM or FACSVerse TM ( The fluorescence intensity was measured by Becton Dickinson and Company.
- a negative control a negative control sample was prepared by performing the same operation as described above using a hybridoma culture medium. As a result, the fluorescence intensity when using the culture supernatant of the hybridoma producing the rabbit anti-CAPRIN-1 monoclonal antibody is stronger than that when using the negative control in all the cancer cells used in the above evaluation. It was. From the above results, it was confirmed that the rabbit anti-CAPRIN-1 monoclonal antibody reacts with CAPRIN-1 on the surface of the cancer cell membrane of human cancer cells.
- Example 2 Production of human-rabbit chimeric anti-CAPRIN-1 monoclonal antibody For expressing the amino acid sequence of the heavy chain variable region represented by SEQ ID NO: 20 of the rabbit anti-CAPRIN-1 monoclonal antibody identified in Example 1
- the gene and the gene for expressing the light chain variable region represented by SEQ ID NO: 21 are inserted into the mammalian cell expression vector into which the heavy chain constant region of human IgG1 is inserted and the light chain constant region of human IgG1, respectively. And inserted into a mammalian cell expression vector.
- the prepared two recombinant expression vectors were introduced into mammalian cells according to a conventional method to obtain a culture supernatant containing a human-rabbit chimeric anti-CAPRIN-1 antibody (human-rabbit chimeric antibody).
- the culture supernatant containing the chimerized antibody thus obtained was purified using Hitrap Protein A Sepharose FF (manufactured by GE Healthcare) according to a conventional method, and replaced with PBS (-), and a 0.22 ⁇ m filter (manufactured by Millipore). What was filtered with was prepared.
- Example 3 Production of Humanized Anti-CAPRIN-1 Monoclonal Antibody
- CDR1-3 in the heavy chain variable region and CDR1 in the light chain variable region of the rabbit anti-CAPRIN-1 monoclonal antibody identified in Example 1 were used.
- the heavy chain variable region represented by SEQ ID NO: 7 consisting of the amino acid sequences of SEQ ID NO: 1, SEQ ID NO: 2, and SEQ ID NO: 3, respectively, based on the amino acid sequence and base sequence information of 3
- the nucleotide sequence was designed so as to express the amino acid sequence, and this was inserted into a mammalian cell expression vector into which the heavy chain constant region of human IgG1 was inserted.
- the CDRs 1 to 3 of the light chain variable region are expressed so that the amino acid sequence of the light chain variable region represented by SEQ ID NO: 11 consisting of the amino acid sequences of SEQ ID NO: 4, SEQ ID NO: 5 and SEQ ID NO: 6 can be expressed.
- the sequence was designed and inserted into a mammalian cell expression vector into which the light chain constant region of human IgG1 was inserted.
- the above two recombinant expression vectors are introduced into mammalian cells according to a conventional method, and humanized antibody # consisting of the heavy chain full-length amino acid sequence represented by SEQ ID NO: 7 and the light chain full-length amino acid sequence represented by SEQ ID NO: 11 A culture supernatant containing 0 was obtained.
- the heavy chain variable region CDRs 1 to 3 are respectively represented by SEQ ID NO: 8, consisting of the amino acid sequences of SEQ ID NO: 1, SEQ ID NO: 2 and SEQ ID NO: 3, and SEQ ID NO: 11.
- SEQ ID NO: 8 consisting of the amino acid sequences of SEQ ID NO: 1, SEQ ID NO: 2 and SEQ ID NO: 3, and SEQ ID NO: 11.
- a culture supernatant containing humanized antibody # 1 consisting of the amino acid sequence of the light chain variable region shown was obtained.
- the amino acid sequence of the heavy chain variable region represented by SEQ ID NO: 8 and the light chain variable region CDRs 1 to 3 are the light chains represented by SEQ ID NO: 12 consisting of the amino acid sequences of SEQ ID NO: 4, SEQ ID NO: 5 and SEQ ID NO: 6, respectively.
- Humanized antibody # 2 consisting of the full-length amino acid sequence.
- amino acid sequence of the heavy chain variable region represented by SEQ ID NO: 8 and the light chain variable region CDRs 1 to 3 are each represented by SEQ ID NO: 13 consisting of the amino acid sequences of SEQ ID NO: 4, SEQ ID NO: 5 and SEQ ID NO: 6, respectively.
- Humanized antibody # 3 consisting of the full-length amino acid sequence.
- Humanized antibody # 4 consisting of the amino acid sequence of the heavy chain variable region represented by SEQ ID NO: 7 and the light chain full-length amino acid sequence represented by SEQ ID NO: 12.
- Humanized antibody # 5 consisting of the amino acid sequence of the heavy chain variable region represented by SEQ ID NO: 7 and the light chain full-length amino acid sequence represented by SEQ ID NO: 13.
- the amino acid sequence of the heavy chain variable region represented by SEQ ID NO: 7 and the light chain variable region CDRs 1 to 3 are the light chains represented by SEQ ID NO: 15 comprising the amino acid sequences of SEQ ID NO: 4, SEQ ID NO: 5 and SEQ ID NO: 6, respectively.
- Humanized antibody # 6 consisting of the full-length amino acid sequence.
- Humanized antibody # 7 consisting of the amino acid sequence of the heavy chain variable region represented by SEQ ID NO: 8 and the light chain full-length amino acid sequence represented by SEQ ID NO: 15.
- the heavy chain variable region CDRs 1 to 3 are respectively represented by SEQ ID NO: 9, consisting of the amino acid sequences of SEQ ID NO: 1, SEQ ID NO: 2 and SEQ ID NO: 3, and the light chain variable region represented by SEQ ID NO: 15.
- Humanized antibody # 8 consisting of the full-length amino acid sequence.
- the heavy chain variable region CDRs 1-3 are represented by SEQ ID NO: 10, each consisting of the amino acid sequences of SEQ ID NO: 1, SEQ ID NO: 2, and SEQ ID NO: 3, and the light chain variable region CDRs 1-3 Humanized antibody # 9 consisting of the light chain full-length amino acid sequence represented by SEQ ID NO: 14 consisting of the amino acid sequences of SEQ ID NO: 4, SEQ ID NO: 5 and SEQ ID NO: 6, respectively.
- Humanized antibody # 10 consisting of the amino acid sequence of the heavy chain variable region represented by SEQ ID NO: 10 and the light chain full-length amino acid sequence represented by SEQ ID NO: 15.
- the obtained culture supernatant containing humanized antibodies # 0 to # 10 was purified using Hitrap Protein A Sepharose FF (manufactured by GE Healthcare) according to a conventional method, and replaced with PBS ( ⁇ ) to obtain a 0.22 ⁇ m filter. What was filtered by (Millipore) was prepared.
- Example 4 Antigen specificity of human-rabbit chimeric antibody and humanized antibodies # 0 to # 10 and reactivity to cancer cells
- human-rabbit chimeric antibody prepared in Example 2 and prepared in Example 3 The specific reactivity of the humanized antibodies # 0 to # 10 to the CAPRIN-1 protein was confirmed by ELISA according to a conventional method. Specifically, 100 ⁇ L of a PBS solution containing 5 ⁇ g / mL CAPRIN-1 protein was added in advance per well of a 96-well plate, and allowed to stand at 4 ° C. for 18 hours.
- a blocking solution composed of a PBS solution containing 5% skim milk was added per well, and the mixture was allowed to stand at room temperature for 3 hours.
- each solution containing the human-rabbit chimeric antibody and humanized antibodies # 0 to # 10 prepared to 1 ⁇ g / mL with PBS containing 0.2% skim milk was added.
- 50 ⁇ L per well was added to each well and allowed to stand at room temperature for 1 hour.
- a negative control a well to which a human IgG antibody that was confirmed not to react with the CAPRIN-1 protein was added at the same antibody concentration and a well to which no antibody was added were prepared simultaneously.
- human-rabbit chimeric antibody and humanized antibody # 0 to # 10 are collected in a 1.5 mL microcentrifuge tube, and the final concentration of human-rabbit chimeric antibody and humanized antibody # 0 to # 10 is 50 ⁇ g / mL. Thus, it added to each tube and made it react at 4 degreeC for 1 hour.
- An Alexa488-labeled goat anti-human IgG (H + L) antibody (manufactured by Life Technologies) washed twice with 0.5% FBS-PBS ( ⁇ ) and diluted 100-fold with 0.5% FBS-PBS ( ⁇ ) The mixture was added and allowed to stand at 4 ° C. for 60 minutes.
- the cells were suspended in 0.5% FBS-PBS ( ⁇ ) containing Propium iodide at a final concentration of 0.2 ⁇ g / mL, and FACSCalibur TM or FACSVerse TM (The fluorescence intensity was measured by Becton Dickinson and Company.
- FACSCalibur TM or FACSVerse TM The fluorescence intensity was measured by Becton Dickinson and Company.
- a negative control one prepared by performing the same operation as described above using a hybridoma culture medium was used.
- the fluorescence intensity of the human-rabbit chimeric antibody and the humanized antibodies # 0 to # 10 was stronger than the fluorescence intensity when the negative control was used in all the cancer cells used in the above evaluation. From the above results, it was confirmed that the human-rabbit chimeric antibody and humanized antibodies # 0 to # 10 react with the CAPRIN-1 protein expressed on the surface of the human cancer cell membrane.
- Example 5 Anti-tumor activity of human-rabbit chimeric antibody and humanized antibodies # 0 to # 10 against various human cancer cells
- human-rabbit chimeric antibody prepared in Example 2 and human prepared in Example 3 The anti-tumor effect of conjugated antibodies # 0 to # 10 on various human cancer cells was evaluated by ADCC activity.
- anti-CAPRIN-1 antibodies were used as comparative antibodies for human-rabbit chimeric antibodies and humanized antibodies # 0 to # 10.
- Comparative antibody 1 having the heavy chain variable region of SEQ ID NO: 26 and the light chain variable region of SEQ ID NO: 27, and the heavy chain variable region of SEQ ID NO: 28 and SEQ ID NO: 29, which are antibodies described in WO2010 / 016526
- Comparative antibody 2 having a light chain variable region
- comparative antibody 3 having a heavy chain variable region of SEQ ID NO: 30 and a light chain variable region of SEQ ID NO: 31, heavy chain variable region of SEQ ID NO: 32 and light chain variable region of SEQ ID NO: 33
- a comparative antibody 4 having a heavy chain variable region of SEQ ID NO: 34 and a light chain variable region of SEQ ID NO: 35, a comparative antibody having a heavy chain variable region of SEQ ID NO: 36 and a light chain variable region of SEQ ID NO: 37 6.
- Comparative antibody 7 having a heavy chain variable region of SEQ ID NO: 38 and a light chain variable region of SEQ ID NO: 39
- Comparative antibody 8 having a heavy chain variable region of SEQ ID NO: 40 and a light chain variable region of SEQ ID NO: 41
- SEQ ID NO: 42 's Comparative antibody 9 having a chain variable region and a light chain variable region of SEQ ID NO: 43
- Comparative antibody 10 having a heavy chain variable region of SEQ ID NO: 44 and a light chain variable region of SEQ ID NO: 45, and a heavy chain variable region of SEQ ID NO: 46
- Comparative antibody 11 having the light chain variable region of SEQ ID NO: 47.
- Comparative antibody 12 having the heavy chain variable region of SEQ ID NO: 43 and the light chain variable region of SEQ ID NO: 47, and the heavy chain variable region of SEQ ID NO: 43 and SEQ ID NO: 53 of the antibody described in WO2011 / 096517 Comparative antibody 13 with light chain variable region.
- Comparative antibody 14 having the heavy chain variable region of SEQ ID NO: 43 and the light chain variable region of SEQ ID NO: 47, and the heavy chain variable region of SEQ ID NO: 51 and SEQ ID NO: 55, which are antibodies described in WO2011 / 096528
- Comparative antibody 15 having a light chain variable region
- comparative antibody 16 having a heavy chain variable region of SEQ ID NO: 59 and a light chain variable region of SEQ ID NO: 63, heavy chain variable region of SEQ ID NO: 76 and light chain variable region of SEQ ID NO: 80
- Comparative antibody 17 having a heavy chain variable region of SEQ ID NO: 84 and a light chain variable region of SEQ ID NO: 88, Comparative antibody having a heavy chain variable region of SEQ ID NO: 92 and a light chain variable region of SEQ ID NO: 96 19.
- Comparative antibody 20 having the heavy chain variable region of SEQ ID NO: 42 and the light chain variable region of SEQ ID NO: 46 in the antibody described in WO2011 / 096519.
- Comparative antibody 21 having the heavy chain variable region of SEQ ID NO: 43 and the light chain variable region of SEQ ID NO: 51, and the heavy chain variable region of SEQ ID NO: 47 and SEQ ID NO: 51 of the antibody described in WO2011 / 096533
- Comparative antibody 22 having a light chain variable region
- Comparative antibody 23 having a heavy chain variable region of SEQ ID NO: 63 and a light chain variable region of SEQ ID NO: 67.
- Comparative antibody 24 having the heavy chain variable region of SEQ ID NO: 43 and the light chain variable region of SEQ ID NO: 47, the heavy chain variable region of SEQ ID NO: 43, and SEQ ID NO: 51, which are antibodies described in WO2011 / 096534 Comparative antibody 25 having a light chain variable region, comparative antibody 26 having a heavy chain variable region of SEQ ID NO: 63 and a light chain variable region of SEQ ID NO: 67.
- Comparative antibody 27 which is an antibody described in WO2013 / 018894 and has the heavy chain variable region of SEQ ID NO: 9 and the light chain variable region of SEQ ID NO: 13, and the heavy chain variable region of SEQ ID NO: 19 and SEQ ID NO: 23
- Comparative antibody 28 having a light chain variable region
- comparative antibody 29 having a heavy chain variable region of SEQ ID NO: 9 and a light chain variable region of SEQ ID NO: 53, heavy chain variable region of SEQ ID NO: 58 and light chain variable region of SEQ ID NO: 62
- a comparative antibody 30 having a heavy chain variable region of SEQ ID NO: 63 and a light chain variable region of SEQ ID NO: 65, a comparative antibody having a heavy chain variable region of SEQ ID NO: 69 and a light chain variable region of SEQ ID NO: 73 32.
- Comparative antibody 33 having the heavy chain variable region of SEQ ID NO: 77 and the light chain variable region of SEQ ID NO: 81.
- Comparative antibody 34 having the heavy chain variable region of SEQ ID NO: 8 and the light chain variable region of SEQ ID NO: 12 in the antibody described in WO2013 / 018892.
- Comparative antibody 35 having the heavy chain variable region of SEQ ID NO: 8 and the light chain variable region of SEQ ID NO: 12 in the antibody described in WO2013 / 018891.
- Comparative antibody 36 having the heavy chain variable region of SEQ ID NO: 8 and the light chain variable region of SEQ ID NO: 12 in the antibody described in WO2013 / 018889.
- Comparative antibody 37 having the heavy chain variable region of SEQ ID NO: 8 and the light chain variable region of SEQ ID NO: 12 described in WO2010 / 018883.
- Comparative antibody 38 having the heavy chain variable region of SEQ ID NO: 6 and the light chain variable region of SEQ ID NO: 7 described in WO2013 / 125636.
- Comparative antibody 39 having the heavy chain variable region of SEQ ID NO: 52 and the light chain variable region of SEQ ID NO: 54, which is an antibody described in WO2013 / 125654.
- Comparative antibody 40 having the heavy chain variable region of SEQ ID NO: 21 and the light chain variable region of SEQ ID NO: 23 in the same document.
- Comparative antibody 41 having the heavy chain variable region of SEQ ID NO: 25 and the light chain variable region of SEQ ID NO: 23 in the same document.
- Comparative antibody 42 having the heavy chain variable region of SEQ ID NO: 16 and the light chain variable region of SEQ ID NO: 18 in the same document.
- Comparative antibody 43 having the heavy chain variable region of SEQ ID NO: 29 and the light chain variable region of SEQ ID NO: 33 in the same document.
- Comparative antibody 44 having the heavy chain variable region of SEQ ID NO: 39 and the light chain variable region of SEQ ID NO: 43 in the same document.
- a comparative antibody 45 having the heavy chain variable region of SEQ ID NO: 49 and the light chain variable region of SEQ ID NO: 43 in the same document.
- Comparative antibody 46 having the heavy chain variable region of SEQ ID NO: 11 and the light chain variable region of SEQ ID NO: 15 described in WO2013 / 125630.
- Comparative antibody 47 which is an antibody described in WO2013 / 125640 and has a heavy chain variable region of SEQ ID NO: 11 and a light chain variable region of SEQ ID NO: 15 in the same document.
- Comparative antibody 48 having the heavy chain variable region of SEQ ID NO: 21 and the light chain variable region of SEQ ID NO: 25 in the same document.
- the above-described antibodies (Comparative antibodies 1 to 48) were prepared by expressing a gene for expressing the amino acid sequence of the heavy chain variable region and a gene for expressing the light chain variable region, respectively, in the heavy chain constant of human IgG1.
- Mammalian cell expression vector pcDNA4 / myc-His (Life Technologies) with inserted region and mammalian cell expression vector pcDNA3.1 / myc-His (Life Technologies) with inserted light chain constant region of human IgG1
- the human chimeric or humanized antibody obtained by introducing the two recombinant expression vectors thus prepared into mammalian cells according to a conventional method is purified using Hitrap Protein A Sepharose FF (manufactured by GE Healthcare), Replace with PBS (-) to 0.22 Used was filtered with m filter (Millipore).
- a well to which an isotype control antibody was added a well to which no antibody was added, and an antibody that reacts with the CAPRIN-1 protein but does not react with the surface of human cancer cells expressing CAPRIN-1.
- Added wells were prepared. Each antibody was added to a V-bottom 96-well plate at a final concentration of 5 ⁇ g / mL.
- human NK cells separated from human peripheral blood mononuclear cells by a conventional method were used.
- Human peripheral blood mononuclear cells are separated using a specific gravity separation solution Histopaque (Sigma Aldrich) for separation of peripheral blood mononuclear cells, and labeled with a FITC fluorescent dye (anti-human CD3 antibody, anti-human CD20 antibody, React with anti-human CD19 antibody, anti-human CD11c antibody, anti-HLA-DR antibody (Farmingen) and use cell sorter (FACS Vantage SE (Becton Dickinson and Company)), do not stain with the above antibody, NK A cell population containing cells or a human NK cell separation kit (Milteny) was used.
- a V-bottom 96-well plate to which the above antibodies were added was prepared by adding 0.4 to 2.0 ⁇ 10 5 human NK cells per well.
- Target cells are breast cancer cells (BT-474, MDA-MB-361), colon cancer cells (HT-29), lung cancer cells (QG56), stomach cancer cells (NCI-N87), uterine cancer cells (HEC-1-A). ), Prostate cancer cells (22Rv1), pancreatic cancer cells (Panc 10.5), liver cancer cells (Hep3B), ovarian cancer cells (SKOV3), renal cancer cells (Caki-2), brain tumor cells (U-87MG), bladder Cancer cells (T24, HT-1376), esophageal cancer cells (OE33), leukemia cells (OCI-AML5), lymphoma cells (Ramos), gallbladder cancer cells (TGBC14TKB), fibrosarcoma cells (HT-1080), melanoma cells ( G-361), adrenocortical carcinoma (A-673), Ewing tumor (RD-ES), Hodgkin lymphoma (RPMI1666), mesothelioma (NCI-H24) 2), multiple mye
- each of the culture supernatant containing the chromium 51 culture supernatant in the culture supernatant released from the damaged cancer cells was collected, and the well bottom was coated with an individual scintillator.
- 96 manufactured by Perkin Elmer
- the amount of chromium 51 in the culture supernatant released from the damaged cancer cells was measured, and anti-tumor effect on cancer cells by anti-CAPRIN-1 antibody was calculated.
- humanized antibody # 7, humanized antibody # 10, and humanized antibody # 6 showed an antitumor effect of 54% or more against breast cancer cells (BT-474), and humanized antibody # 3, human Humanized antibody # 4, humanized antibody # 2 and humanized antibody # 5 exhibit 50% or more activity, humanized antibody # 9, humanized antibody # 1, humanized antibody # 0, human-rabbit chimeric antibody, human The antibody # 8 showed an activity of 46% or more, whereas the comparative antibodies 1 to 48 were all 25% or less, and the negative control group was 10% or less.
- humanized antibody # 7, humanized antibody # 10, and humanized antibody # 6 antibody showed an antitumor effect of 52% or more
- humanized antibody # 3, humanized antibody Antibody # 4, humanized antibody # 2, and humanized antibody # 5 show 45% or more activity
- humanized Antibody # 8 showed an activity of 40% or more
- Comparative antibodies 1 to 48 were all 25% or less, and the negative control group was 6% or less.
- humanized antibody # 7, humanized antibody # 10, and humanized antibody # 6 showed an antitumor effect of 43% or more, and humanized antibody # 3, humanized antibody # 6 4.
- Humanized antibody # 2 and humanized antibody # 5 exhibit an activity of 40% or more.
- Humanized antibody # 9, humanized antibody # 1, humanized antibody # 0, human-rabbit chimeric antibody, humanized antibody # 8 showed an activity of 35% or more, whereas Comparative antibodies 1 to 48 were all 20% or less, and the negative control group was 3% or less.
- humanized antibody # 7, humanized antibody # 10, and humanized antibody # 6 showed an antitumor effect of 46% or more
- humanized antibody # 3 humanized antibody # 4
- human Humanized antibody # 2 and humanized antibody # 5 exhibit 42% or more of activity
- humanized antibody # 9 humanized antibody # 1, humanized antibody # 0, human-rabbit chimeric antibody, and humanized antibody # 8 have 38 %
- the comparative antibodies 1 to 48 were all 22% or less, and the negative control groups were all 10% or less.
- humanized antibody # 7 humanized antibody # 10
- humanized antibody # 6 showed an antitumor effect of 45% or more.
- Humanized antibody # 3 and humanized antibody # 4 The humanized antibody # 2 and the humanized antibody # 5 exhibit an activity of 38% or more.
- the antibody # 9, the humanized antibody # 1, the humanized antibody # 0, the human-rabbit chimeric antibody, and the humanized antibody # 8 have 34 activities.
- the comparative antibodies 1 to 48 were all 15% or less, while the negative control group was 8% or less.
- humanized antibody # 7, humanized antibody # 10, and humanized antibody # 6 showed an antitumor effect of 52% or more
- humanized antibody # 3, humanized antibody Antibody # 4, humanized antibody # 2, and humanized antibody # 5 show 45% or more activity
- humanized Antibody # 8 showed an activity of 40% or more
- Comparative antibodies 1 to 48 were all 20% or less, and all negative control groups were 5% or less.
- humanized antibody # 7, humanized antibody # 10, and humanized antibody # 6 show an antitumor effect of 49% or more
- humanized antibody # 3, antibody # 4, humanized Antibody # 2 and humanized antibody # 5 exhibit 45% or more activity
- humanized antibody # 9, humanized antibody # 1, humanized antibody # 0, human-rabbit chimeric antibody, and humanized antibody # 8 have 38%
- the comparative antibodies 1 to 48 were all 20% or less
- the negative control groups were all 12% or less.
- pancreatic cancer cells Panc 10.5
- humanized antibody # 7, humanized antibody # 10, and humanized antibody # 6 exhibit an anti-tumor effect of 35% or more
- Humanized antibody # 2 and humanized antibody # 5 show activity of 30% or more
- humanized antibody # 8 showed an activity of 24% or more
- Comparative antibodies 1 to 48 were all 10% or less, and the negative control group was 2% or less.
- humanized antibody # 7, humanized antibody # 10, and humanized antibody # 6 show an antitumor effect of 28% or more
- humanized antibody # 3 humanized antibody # 4
- Humanized antibody # 2 and humanized antibody # 5 exhibit activity of 25% or more.
- Humanized antibody # 9, humanized antibody # 1, humanized antibody # 0, human-rabbit chimeric antibody, and humanized antibody # 8 are While the activity of 21% or more was shown, the comparative antibodies 1 to 48 were all 12% or less, and the negative control groups were all 5% or less.
- humanized antibody # 7, humanized antibody # 10, and humanized antibody # 6 show an anti-tumor effect of 35% or more
- humanized antibody # 3 humanized antibody # 4
- Humanized antibody # 2 and humanized antibody # 5 exhibit an activity of 31% or more
- Humanized antibody # 9 humanized antibody # 1, humanized antibody # 0, human-rabbit chimeric antibody, and humanized antibody # 8 are While the activity of 27% or more was shown, the comparative antibodies 1 to 48 were all 15% or less, and the negative control groups were all 5% or less.
- humanized antibody # 7 humanized antibody # 10, and humanized antibody # 6 showed an antitumor effect of 37% or more, and humanized antibody # 3, humanized antibody # 6 4.
- Humanized antibody # 2 and humanized antibody # 5 show activity of 33% or more, humanized antibody # 9, humanized antibody # 1, humanized antibody # 0, human-rabbit chimeric antibody, humanized antibody # 8 showed an activity of 26% or more, whereas the comparative antibodies 1 to 48 were all 15% or less, and the negative control group was 5% or less.
- humanized antibody # 7, humanized antibody # 10, and humanized antibody # 6 showed an antitumor effect of 36% or more, and humanized antibody # 3 and humanized antibody # 4.
- the humanized antibody # 2 and the humanized antibody # 5 exhibit an activity of 29% or more.
- the humanized antibody # 9, the humanized antibody # 1, the humanized antibody # 0, the human-rabbit chimeric antibody, the humanized antibody # 8 was 24% or more, whereas Comparative antibodies 1 to 48 were all 10% or less, and all negative control groups were 6% or less.
- humanized antibody # 7, humanized antibody # 10, and humanized antibody # 6 show an antitumor effect of 36% or more
- humanized antibody # 3 humanized antibody # 4
- Humanized antibody # 2 and humanized antibody # 5 exhibit 33% or more activity.
- Humanized antibody # 9 humanized antibody # 1, humanized antibody # 0, human-rabbit chimeric antibody, and humanized antibody # 8 are While the activity of 30% or more was shown, the comparative antibodies 1 to 48 were all 15% or less, and the negative control group was 6% or less.
- humanized antibody # 7 humanized antibody # 10
- humanized antibody # 6 showed an anti-tumor effect of 45% or more
- humanized antibody # 3 humanized antibody # 6 4.
- Humanized antibody # 2 and humanized antibody # 5 exhibit an activity of 40% or more.
- Humanized antibody # 9, humanized antibody # 1, humanized antibody # 0, human-rabbit chimeric antibody, humanized antibody # 8 showed an activity of 28% or more, whereas Comparative antibodies 1 to 48 were all 20% or less, and the negative control group was 7% or less.
- humanized antibody # 7, humanized antibody # 10, and humanized antibody # 6 show antitumor effects of 35% or more
- humanized antibody # 3 humanized antibody # 4
- Humanized antibody # 2 and humanized antibody # 5 exhibit 33% or more activity.
- Humanized antibody # 9 humanized antibody # 1, humanized antibody # 0, human-rabbit chimeric antibody, and humanized antibody # 8 are While the activity of 30% or more was shown, the comparative antibodies 1 to 48 were all 15% or less, and the negative control group was 6% or less.
- humanized antibody # 7 humanized antibody # 10
- humanized antibody # 6 showed an anti-tumor effect of 20% or more.
- Humanized antibody # 3 and humanized antibody # 4 Humanized antibody # 2 and humanized antibody # 5 exhibit an activity of 18% or more.
- Humanized antibody # 9, humanized antibody # 1, humanized antibody # 0, human-rabbit chimeric antibody, humanized antibody # 8 Showed 15% or more of activity, whereas Comparative antibodies 1 to 48 were all 10% or less, and the negative control group was 6% or less.
- humanized antibody # 7, humanized antibody # 10, and humanized antibody # 6 show an antitumor effect of 20% or more
- humanized antibody # 3 humanized antibody # 4
- human Humanized antibody # 2 and humanized antibody # 5 exhibit 18% or more activity
- antibody # 9, antibody # 1, humanized antibody # 0, human-rabbit chimeric antibody, and humanized antibody # 8 exhibit 15% or more activity
- the comparative antibodies 1 to 48 were all 10% or less, and the negative control group was 6% or less.
- Humanized antibody # 7, humanized antibody # 10, and humanized antibody # 6 show anti-tumor effects of 35% or more against gallbladder cancer cells (TGBC14TKB), humanized antibody # 3, humanized antibody # 4, human Humanized antibody # 2 and humanized antibody # 5 exhibit activity of 30% or more.
- Humanized antibody # 9, humanized antibody # 1, humanized antibody # 0, human-rabbit chimeric antibody, and humanized antibody # 8 have 25 % Of the comparative antibodies 1 to 48 were all 15% or less, and all the negative control groups were 6% or less.
- humanized antibody # 7, humanized antibody # 10, and humanized antibody # 6 showed an anti-tumor effect of 30% or more
- humanized antibody # 3 antibody # 4
- Humanized antibody # 2 and humanized antibody # 5 exhibit activity of 25% or more.
- Humanized antibody # 9, humanized antibody # 1, humanized antibody # 0, human-rabbit chimeric antibody, and humanized antibody # 8 are While the activity of 20% or more was shown, the comparative antibodies 1 to 48 were all 10% or less, and the negative control group was 6% or less.
- humanized antibody # 7, humanized antibody # 10, and humanized antibody # 6 showed an antitumor effect of 25% or more
- humanized antibody # 3 humanized antibody # 4
- Humanized antibody # 2 and humanized antibody # 5 exhibit 21% or more activity.
- Humanized antibody # 9, humanized antibody # 1, humanized antibody # 0, human-rabbit chimeric antibody, and humanized antibody # 8 are While the activity of 15% or more was shown, the comparative antibodies 1 to 48 were all 8% or less, and the negative control group was 6% or less.
- humanized antibody # 7, humanized antibody # 10, and humanized antibody # 6 show an antitumor effect of 50% or more
- humanized antibody # 3, humanized antibody # 4, humanized antibody # 2 and humanized antibody # 5 show 46% or more activity
- humanized antibody # 8 showed an activity of 40% or more
- Comparative antibodies 1 to 48 were all 20% or less, and the negative control group was 8% or less.
- humanized antibody # 7 humanized antibody # 10, and humanized antibody # 6 showed an antitumor effect of 48% or more, and humanized antibody # 3, humanized antibody # 6 4.
- Humanized antibody # 2 and humanized antibody # 5 exhibit an activity of 40% or more.
- Humanized antibody # 9, humanized antibody # 1, humanized antibody # 0, human-rabbit chimeric antibody, humanized antibody # 8 showed an activity of 31% or more, whereas Comparative antibodies 1 to 48 were all 15% or less, and the negative control group was 6% or less.
- humanized antibody # 7, humanized antibody # 10, and humanized antibody # 6 showed an antitumor effect of 40% or more
- humanized antibody # 3 humanized antibody # 4
- Humanized antibody # 2 show activity of 36% or more
- Humanized antibody # 9 humanized antibody # 1, humanized antibody # 0, human-rabbit chimeric antibody, and humanized antibody # 8 are While the activity of 30% or more was shown, the comparative antibodies 1 to 48 were all 20% or less, and the negative control group was 5% or less.
- humanized antibody # 7, humanized antibody # 10, and humanized antibody # 6 exhibit an antitumor effect of 35% or more
- humanized antibody # 3, humanized antibody # 4, humanized antibody # 2 and humanized antibody # 5 show 39% or more activity
- humanized antibody While # 8 showed an activity of 31% or more
- the comparative antibodies 1 to 48 were all 10% or less
- the negative control group was 5% or less.
- humanized antibody # 7, humanized antibody # 10, and humanized antibody # 6 show an anti-tumor effect of 35% or more
- humanized antibody # 3, humanized antibody Antibody # 4, Antibody # 2, and Humanized antibody # 5 show 30% or more activity.
- Humanized antibody # 9, antibody # 1, humanized antibody # 0, human-rabbit chimeric antibody, and humanized antibody # 8 are While the activity of 27% or more was shown, the comparative antibodies 1 to 48 were all 10% or less, and the negative control group was 6% or less.
- humanized antibody # 7 humanized antibody # 10, and humanized antibody # 6 showed an antitumor effect of 37% or more, and humanized antibody # 3 and humanized antibody # 6 4.
- Humanized antibody # 2 and humanized antibody # 5 show activity of 30% or more, humanized antibody # 9, humanized antibody # 1, humanized antibody # 0, human-rabbit chimeric antibody, humanized antibody # 8 showed an activity of 25% or more, whereas Comparative antibodies 1 to 48 were all 11% or less, and the negative control group was 5% or less.
- humanized antibody # 7, humanized antibody # 10, and humanized antibody # 6 showed an antitumor effect of 42% or more, humanized antibody # 3, humanized antibody # 4, Humanized antibody # 2 and humanized antibody # 5 exhibit activity of 35% or more.
- Humanized antibody # 9, humanized antibody # 1, humanized antibody # 0, human-rabbit chimeric antibody, and humanized antibody # 8 are While the activity of 30% or more was shown, the comparative antibodies 1 to 48 were all 15% or less, and the negative control groups were all 5% or less.
- humanized antibody # 7, humanized antibody # 10, and humanized antibody # 6 show an anti-tumor effect of 50% or more
- humanized antibody # 3 humanized antibody # 4.
- Humanized antibody # 4 show an activity of 40% or more.
- Humanized antibody # 9, humanized antibody # 1, humanized antibody # 0, human-rabbit chimeric antibody, and antibody # 8 are While the activity of 35% or more was shown, the comparative antibodies 1 to 48 were all 20% or less, and the negative control group was 8% or less.
- humanized antibodies # 0 to # 10 and human-rabbit chimeric antibodies are found in breast cancer, kidney cancer, pancreatic cancer, colon cancer, lung cancer, brain tumor, stomach cancer, uterine cancer, ovarian cancer, prostate cancer, bladder cancer, Compared to esophageal cancer, leukemia, lymphoma, liver cancer, gallbladder cancer, sarcoma, melanoma, adrenocortical cancer, Ewing tumor, Hodgkin lymphoma, mesothelioma, multiple myeloma, testicular cancer, thyroid cancer or head and neck cancer It was revealed that the antitumor effect was significantly stronger than that of the antibody.
- Humanized antibodies # 0 to # 10 and human-rabbit chimeric antibodies are WO2010 / 016526, WO2011 / 096517, WO2011 / 096528, WO2011 / 096519, WO2011 / 096533, WO2011 / 096534, WO2011 / 096535, WO2013 / 018886, WO2013 / 018894, WO2013 / 018882, WO2013 / 018881, WO2013 / 018889, WO2013 / 018883, WO2013 / 125636, WO2013 / 125654, WO2013 / 125630, WO2013 / 125640, WO2013 / 147169, WO2013 / 147176 Than the antibody against CAPRIN-1 , Pancreatic cancer, colon cancer, lung cancer, brain cancer, stomach cancer, uterine cancer, ovarian cancer, prostate cancer, bladder cancer, esophageal cancer, leukemia, lymphoma, liver cancer, gallbladder cancer,
- the antitumor effect was determined by mixing the antibody against CAPRIN-1, effector cells, and target cells into which chromium 51 had been incorporated and culturing for 4 hours, and measuring the amount of chromium 51 released into the medium after the culture. It is the result which showed the cytotoxic activity with respect to the cancer cell line computed by the formula * .
- Cytotoxic activity (%) (Amount of chromium 51 released from target cells when adding antibody against CAPRIN-1 and effector cells ⁇ Amount of spontaneous release of chromium 51 from target cells) ⁇ (1N hydrochloric acid added Chromium 51 release from target cells-chromium 51 spontaneous release from target cells) x 100.
- Example 6-1 Preparation of humanized anti-CAPRIN-1 monoclonal antibody in which amino acids in the heavy chain constant region are substituted Humanized antibodies # 0, # 2, # 3, # 4, # 5 obtained in Example 3 , # 6, # 7, # 8, # 9, # 10, an anti-CAPRIN-1 antibody having the heavy chain constant region of SEQ ID NO: 33 in which a part of amino acids in the heavy chain constant region is substituted (hereinafter referred to as the modified I Type anti-CAPRIN-1 antibody).
- a DNA encoding a heavy chain amino acid sequence having the heavy chain constant region and the heavy chain variable region represented by SEQ ID NO: 7 was synthesized and inserted into a mammalian cell expression vector according to a conventional method.
- a DNA encoding the light chain variable region amino acid represented by SEQ ID NO: 11 was prepared by inserting it into a mammalian cell expression vector into which a gene encoding the light chain constant region of human IgG1 was inserted.
- the prepared two recombinant expression vectors were introduced into mammalian cells according to a conventional method to obtain a culture supernatant of humanized antibody # 0 modified type I anti-CAPRIN-1 antibody # 0.
- humanized antibodies # 1, # 2, # 3, # 4, # 5, # 6, # 7, # 8, # 9, and # 10 described in Example 3 were also modified in the same manner as described above. Culture supernatants containing anti-CAPRIN-1 antibodies # 1, # 2, # 3, # 4, # 5, # 6, # 7, # 8, # 9, and # 10 were obtained.
- Each culture supernatant containing the modified type I anti-CAPRIN-1 antibodies # 0 to # 10 thus obtained was purified using Hitrap Protein A Sepharose FF (manufactured by GE Healthcare) according to a conventional method, and replaced with PBS ( ⁇ ). And filtered through a 0.22 ⁇ m filter (Millipore).
- An anti-CAPRIN-1 antibody (hereinafter referred to as a modified type II anti-CAPRIN-1 antibody) having the heavy chain constant region shown in SEQ ID NO: 34 in which some amino acids were substituted was prepared.
- a DNA encoding a heavy chain amino acid sequence having the heavy chain constant region and the heavy chain variable region represented by SEQ ID NO: 7 was synthesized and inserted into a mammalian cell expression vector according to a conventional method.
- a DNA encoding the light chain variable region amino acid represented by SEQ ID NO: 11 prepared above and inserted into a mammalian cell expression vector into which a gene encoding the light chain constant region of human IgG1 has been inserted Got ready.
- These two recombinant expression vectors were introduced into mammalian cells according to a conventional method to obtain a culture supernatant of modified type II anti-CAPRIN-1 antibody # 0.
- humanized antibodies # 1, # 2, # 3, # 4, # 5, # 6, # 7, # 8, # 9, and # 10 described in Example 3 were modified in the same manner as described above. Culture supernatants containing anti-CAPRIN-1 antibodies # 1, # 2, # 3, # 4, # 5, # 6, # 7, # 8, # 9, and # 10 were obtained.
- Each culture supernatant containing the obtained modified type II anti-CAPRIN-1 antibodies # 0 to # 10 was purified using Hitrap Protein A Sepharose FF (manufactured by GE Healthcare) according to a conventional method, and replaced with PBS ( ⁇ ). And filtered through a 0.22 ⁇ m filter (Millipore).
- Example 6-2 Production of an anti-CAPRIN-1 antibody having a sugar chain in which fucose is not bound to N-acetylglucosamine at the reducing end of the sugar chain among all N-glycoside-linked sugar chains bound to the heavy chain constant region
- Anti-CAPRIN-1 antibody having a sugar chain in which fucose is not bound to N-acetylglucosamine at the reducing end of the sugar chain among all N-glycoside-linked sugar chains to be bound (hereinafter referred to as modified type III anti-CAPRIN-1 antibody) ) was obtained by the following method.
- GDP-6-deoxy-D-lyxo-4-hexulose reductase is an enzyme that does not catalyze the reaction of converting GDP-6-deoxy-D-lyxo-4-hexulose to GDP-L-fucose according to a conventional method.
- a mammalian cell expression vector containing a neomycin resistance gene into which a gene was incorporated was introduced into a mammalian cell line CHO cell using a gene introduction reagent FreeStyle TM MAX Reagent (Life technologies). The CHO cells into which the above gene was introduced were cultured in a culture medium containing G-418 to prepare a stable pool of CHO cells expressing RMD.
- the gene encoding the amino acid of the variable region is divided into a mammalian cell expression vector into which the heavy chain constant region of human IgG1 is inserted and a mammalian cell expression vector into which the light chain constant region of human IgG1 is inserted, respectively, according to conventional methods.
- the culture supernatant containing the modified type III anti-CAPRIN-1 antibody # 0 was obtained.
- the obtained culture supernatants containing the modified type III anti-CAPRIN-1 antibodies # 0 to # 10 were purified using Hitrap Protein A Sepharose FF (manufactured by GE Healthcare) according to a conventional method, and replaced with PBS ( ⁇ ).
- An antibody composition containing a modified type III anti-CAPRIN-1 antibody # 0 was obtained by filtering a 0.22 ⁇ m filter (Millipore).
- purified antibodies containing modified type III anti-CAPRIN-1 antibodies # 1 to # 10 were obtained.
- Anti-CAPRIN having a sugar chain in which fucose is not bound to N-acetylglucosamine at the reducing end of the sugar chain among all N-glycoside-linked sugar chains bound to the heavy chain constant region contained in these purified antibody compositions -1 antibody ratio was evaluated by LabChip (registered trademark) GXII (PerkinElmer), all of which were 80% or more.
- the RMD-CHO cell encodes the gene encoding the amino acid sequence of the heavy chain variable region represented by SEQ ID NO: 7 and the amino acid of the light chain variable region represented by SEQ ID NO: 11.
- a mammalian cell expression vector containing a hygromycin resistance gene into which a heavy chain constant region of human IgG1 is inserted and a mammalian cell expression vector containing a hygromycin resistance gene into which a light chain constant region of human IgG1 is inserted
- Each of the above-described cells introduced in accordance with a conventional method was cultured in a culture solution containing hygromycin B to prepare a stable pool expressing the modified type III anti-CAPRIN-1 antibody # 0.
- Example 6-3 Of all N-glycoside-linked sugar chains in which amino acids in the heavy chain constant region are substituted and bound to the heavy chain constant region, fucose is bound to N-acetylglucosamine at the sugar chain reducing end. Next, the humanized antibodies # 0, # 1, # 2, # 3, # 4, # 5, # 6, # 7, # 8 described in Example 3 were prepared.
- an anti-CAPRIN-1 antibody (hereinafter referred to as a modified IV anti-CAPRIN-1 antibody) having a sugar chain in which fucose is not bound to N-acetylglucosamine at the sugar chain reducing end was prepared.
- RMD RMD-CHO cell that constantly expresses GDP-6-deoxy-D-lyxo-4-hexulose reductase
- the modified humanized antibodies # 1, # 2, # 3, # 4, # 5, # 6, # 7, # 8, # 9, and # 10 described in Example 3 were modified in the same manner as described above.
- Culture supernatants containing anti-CAPRIN-1 antibodies # 1, # 2, # 3, # 4, # 5, # 6, # 7, # 8, # 9, and # 10 were obtained.
- Each culture supernatant containing the modified IV anti-CAPRIN-1 antibodies # 0 to # 10 thus obtained was purified using Hitrap Protein A Sepharose FF (manufactured by GE Healthcare) according to a conventional method, and replaced with PBS ( ⁇ ).
- the antibody composition containing the modified IV anti-CAPRIN-1 antibody # 0 was obtained by filtration through a 0.22 ⁇ m filter (Millipore).
- a mammalian cell expression vector containing a mycin resistance gene and a DNA encoding the light chain variable region amino acid represented by SEQ ID NO: 11 were synthesized, and the gene encoding the light chain constant region amino acid of human IgG1 was inserted.
- the cells into which a mammalian cell expression vector containing a hygromycin resistance gene was introduced were cultured in a culture medium containing hygromycin B to prepare a stable pool that expresses the modified IV anti-CAPRIN-1 antibody # 0. From this stable pool, cells that constantly and stably express modified IV anti-CAPRIN-1 antibody # 0 were prepared by the limiting dilution method. Furthermore, the modified humanized antibodies # 1, # 2, # 3, # 4, # 5, # 6, # 7, # 8, # 9, and # 10 described in Example 3 were modified in the same manner as described above. Cells that constantly and stably express anti-CAPRIN-1 antibodies # 1, # 2, # 3, # 4, # 5, # 6, # 7, # 8, # 9, and # 10 were prepared.
- Example 7 Antigen Specificity and Reactivity to Cancer Cells of Modified Anti-CAPRIN-1 Antibody Modified Type I Anti-CAPRIN-1 Antibodies # 0 to # 10 Prepared in Examples 6-1 to 3, Modified Type II Anti Each antibody composition containing CAPRIN-1 antibody # 0 to # 10, modified type III anti-CAPRIN-1 antibody # 0 to # 10 and each antibody composition comprising modified type IV CAPRIN-1 antibody # 0 to # 10 ( The specific reactivity of CAPRIN-1 protein (hereinafter referred to as a modified anti-CAPRIN-1 antibody) was confirmed by the same method as in Example 4.
- a modified anti-CAPRIN-1 antibody The specific reactivity of CAPRIN-1 protein (hereinafter referred to as a modified anti-CAPRIN-1 antibody) was confirmed by the same method as in Example 4.
- the absorbance value of the well added with the human IgG antibody that was confirmed not to react with the CAPRIN-1 protein used as a negative control was as low as that of the well not added with the antibody.
- the absorbance values of the wells to which the respective modified anti-CAPRIN-1 antibodies were added were all equally high. Further, all the modified anti-CAPRIN-1 antibodies showed only an absorbance value equivalent to that of the negative control in the wells where the CAPRIN-1 protein was not solid-phased. From this result, it was confirmed that all the modified anti-CAPRIN-1 antibodies specifically react with the CAPRIN-1 protein.
- each modified anti-CAPRIN-1 antibody was stronger than that in the case of using the negative control in all cancer cells used for evaluation. From the above results, it was confirmed that all the modified anti-CAPRIN-1 antibodies specifically react with the CAPRIN-1 protein on the surface of the human cancer cell membrane.
- Example 8 Antitumor activity of modified anti-CAPRIN-1 antibody against various human cancer cells Modified anti-CAPRIN-1 antibody (modified I anti-CAPRIN-1 antibody # 0 prepared in Examples 6-1 to 6-3) -# 10, each of the antibody compositions containing the modified type II anti-CAPRIN-1 antibody # 0- # 10, the modified type III anti-CAPRIN-1 antibody # 0- # 10, and the modified type IV anti-CAPRIN-1 antibody # 0- # The antitumor effect of each antibody composition containing 10) on various human cancer cells was evaluated by ADCC activity in the same manner as in Example 5.
- a well to which an isotype control antibody was added a well to which no antibody was added, and a CAPRIN-1 protein that reacted to a human cancer cell surface expressing CAPRIN-1 but not reactive were added.
- Wells were prepared.
- humanized antibodies # 0 to # 10 which are anti-CAPRIN-1 antibodies before modification, were used. Each antibody was added to a V-bottom 96-well plate at a final concentration of 0.01-1 ⁇ g / mL.
- Target cells are breast cancer cells (BT-474, MDA-MB-361), colon cancer cells (HT-29), lung cancer cells (QG56), stomach cancer cells (NCI-N87), uterine cancer cells (HEC-1-A). ), Prostate cancer cells (22Rv1), pancreatic cancer cells (Panc 10.5), liver cancer cells (Hep3B), ovarian cancer cells (SKOV3), renal cancer cells (Caki-2), brain tumor cells (U-87MG), bladder Cancer cells (T24, HT-1376), esophageal cancer cells (OE33), leukemia cells (OCI-AML5), lymphoma cells (Ramos), gallbladder cancer cells (TGBC14TKB), fibrosarcoma cells (HT-1080), melanoma cells ( G-361), adrenocortical carcinoma cells (A-673), Ewing tumor cells (RD-ES), Hodgkin lymphoma cells (RPMI1666), mesothelioma cells NCI-H2452), multiple
- human NK cells separated from human peripheral blood mononuclear cells by a conventional method were used as the effector cells.
- a V-bottom 96-well plate reacted with each antibody and target cell added thereto was prepared by adding 0.4 to 2.0 ⁇ 10 5 human NK cells per well at 37 ° C., 5% , Reacted for 4 hours under the condition of CO 2 .
- 50 ⁇ L of each culture supernatant containing chromium 51 released from the damaged cancer cells was collected, and the culture supernatant released from the damaged cancer cells in the same manner as in Example 5 was collected.
- the amount of chromium 51 in the serum was measured, and the antitumor effect of the anti-CAPRIN-1 antibody on cancer cells was calculated.
- modified type I anti-CAPRIN-1 antibodies # 0 to # 10 and modified type II anti-CAPRIN-1 antibodies # 0 to # 10 which are modified anti-CAPRIN-1 antibodies, against breast cancer cells (BT-474).
- Each antibody composition containing the modified type III anti-CAPRIN-1 antibody # 0 to # 10 and each antibody composition containing the modified type IV anti-CAPRIN-1 antibody # 0 to # 10 are stronger than the negative control. Tumor effect was shown.
- the anti-tumor effect same as the anti-tumor effect exhibited by each of the antibodies (humanized antibodies # 0 to # 10) before being modified as a comparative antibody has the modified anti-CAPRIN-1 antibodies # 0 to # 10 and modified type II
- the antibody concentration at which each antibody composition containing the anti-CAPRIN-1 antibody # 0 to # 10 and the modified type III anti-CAPRIN-1 antibody # 0 to # 10 shows is approximately 13 compared to the concentration of each antibody before the modification. The concentration was ⁇ 20 times.
- each antibody composition containing the modified IV anti-CAPRIN-1 antibodies # 0 to # 10 obtains the same antitumor effect as the antibody before modification, it is about 150 compared with the concentration of each antibody before modification.
- each antibody composition comprising ⁇ # 10 and the modified IV anti-CAPRIN-1 antibodies # 0 to # 10 was improved compared to each antibody before modification.
- each antibody composition containing the modified IV anti-CAPRIN-1 antibodies # 0 to # 10 comprises modified I anti-CAPRIN-1 antibodies # 0 to # 10 and modified II anti-CAPRIN-1 antibodies # 0 to # 10. It was also found that a stronger antitumor effect can be obtained as compared with each antibody composition containing the modified type III anti-CAPRIN-1 antibodies # 0 to # 10.
- breast cancer cells MDA-MB-361
- colon cancer cells HT-29
- lung cancer cells QG56
- gastric cancer cells NCI-N87
- uterine cancer cells HEC-1-A
- Prostate cancer cells 22Rv1
- pancreatic cancer cells Pancreatic cancer cells
- liver cancer cells Hep3B
- ovarian cancer cells SKOV3
- renal cancer cells Caki-2
- brain tumor cells U-87MG
- bladder cancer cells T24, HT-1376
- esophageal cancer cells OE33
- leukemia cells OCI-AML5
- lymphoma cells Ramos
- gallbladder cancer cells TGBC14TKB
- fibrosarcoma cells HT-1080
- melanoma cells G- 361)
- adrenocortical carcinoma cells A-673
- Ewing tumor cells RD-ES
- Hodgkin lymphoma cells RPMI1666)
- mesothelioma cells N I-H2452
- the antibody of the present invention is useful for the treatment and / or prevention of cancer.
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Abstract
Description
本発明に係るCAPRIN-1に対する抗体を取得するための感作抗原として使用されるタンパク質又はその断片は、ヒト、イヌ、ネコ、ウシ、ウマ、マウス、ラット、ニワトリ等、その由来となる動物種に制限されない。しかし細胞融合に使用する親細胞との適合性を考慮して選択することが好ましい。一般的には、哺乳動物由来のタンパク質が好ましく、特にヒト由来のタンパク質が好ましい。例えば、CAPRIN-1がヒトCAPRIN-1の場合、ヒトCAPRIN-1タンパク質やその部分ペプチド、ヒトCAPRIN-1を発現する細胞等を用いることができる。
抗体(免疫グロブリン)は通常少なくとも2本の重鎖及び2本の軽鎖を含むヘテロ多量体糖タンパク質である。IgMは別として、免疫グロブリンは、2本の同一の軽(L)鎖及び2本の同一の重(H)鎖で構成される約150kDaのヘテロ四量体糖タンパク質である。典型的には、それぞれの軽鎖は1つのジスルフィド共有結合により重鎖に連結されているが、種々の免疫グロブリンアイソタイプの重鎖間でジスルフィド結合の数は変動する。それぞれの重鎖及び軽鎖は鎖内ジスルフィド結合も有する。それぞれの重鎖は一方の端に可変ドメイン(VH領域)を有し、それにいくつかの定常領域が続く。それぞれの軽鎖は可変ドメイン(VL領域)を有し、その反対の端に1つの定常領域を有する。軽鎖の定常領域は重鎖の最初の定常領域と整列しており、かつ軽鎖可変ドメインは重鎖の可変ドメインと整列している。抗体の可変ドメインは、特定の領域が相補性決定領域(CDR)と呼ばれる特定の可変性を示して抗体に結合特異性を付与する。可変領域において相対的に保存されている部分は、フレームワーク領域(framework region;FR)と呼ばれている。完全な重鎖及び軽鎖の可変ドメインは、3つの相補性決定領域が4つのフレームワーク領域で連結された構造、すなわち、N末から順にFR1、CDR1、FR2、CDR2、FR3、CDR3、及びFR4が連結した構造からなる。3つの相補性決定領域は重鎖ではそのN末から順にCDRH1,CDRH2,CDRH3、同様に軽鎖ではCDRL1,CDRL2,CDRL3と呼ばれている。抗体の抗原への結合特異性には、CDRH3が最も重要である。また、各鎖のCDRはフレームワーク領域によって近接した状態で一緒に保持され、他方の鎖由来の相補性決定領域と共に抗体の抗原結合部位の形成に寄与する。定常領域は抗体が抗原に結合することに直接寄与しないが、種々のエフェクター機能、例えば、抗体依存性細胞性細胞障害活性(ADCC)への関与、Fcγ受容体への結合を介した食作用(ADCP)、新生児Fc受容体(FcRn)を介した半減期/クリアランス速度、補体カスケードのC1q構成要素を介した補体依存性細胞障害(CDC)を示す。
本発明における抗CAPRIN-1抗体とは、CAPRIN-1タンパク質の全長又はその断片と免疫学的反応性を有する抗体を意味する。
(b)配列番号10の重鎖可変領域及び配列番号15の軽鎖可変領域で構成される抗体
(c)配列番号7の重鎖可変領域及び配列番号15の軽鎖可変領域で構成される抗体
(d)配列番号8の重鎖可変領域及び配列番号13の軽鎖可変領域で構成される抗体
(e)配列番号7の重鎖可変領域及び配列番号12の軽鎖可変領域で構成される抗体
(f)配列番号8の重鎖可変領域及び配列番号12の軽鎖可変領域で構成される抗体
(g)配列番号7の重鎖可変領域及び配列番号13の軽鎖可変領域で構成される抗体
(h)配列番号10の重鎖可変領域及び配列番号14の軽鎖可変領域で構成される抗体
(i)配列番号8の重鎖可変領域及び配列番号11の軽鎖可変領域で構成される抗体
(j)配列番号7の重鎖可変領域及び配列番号11の軽鎖可変領域で構成される抗体
(k)配列番号9の重鎖可変領域及び配列番号15の軽鎖可変領域で構成される抗体
(l)配列番号20の重鎖可変領域及び配列番号21の軽鎖可変領域で構成される抗体
ここで、配列番号1、2及び3に示すアミノ酸配列はそれぞれ、ウサギ抗体の重鎖可変領域のCDR1、CDR2及びCDR3であり、配列番号4、5及び6に示すアミノ酸配列はそれぞれ、ウサギ抗体の軽鎖可変領域のCDR1、CDR2及びCDR3である。
本発明で用いられる抗CAPRIN-1抗体によるCAPRIN-1発現癌細胞に対する抗腫瘍効果は、以下の機序等により起こると考えられる:前述のCAPRIN-1発現細胞のエフェクター細胞抗体依存的細胞障害性(ADCC)、及びCAPRIN-1発現細胞の抗体依存的細胞貪食性(ADCP)。ただし、この機序により本発明の範囲を限定することは意図しない。
抗体がCAPRIN-1に結合する能力は、実施例で述べられるような、例えば、ELISA法、ウエスタンブロット法、免疫蛍光及びフローサイトメトリー分析等を用いた結合アッセイを利用して特定することができる。
CAPRIN-1を認識する抗体は、当業者に周知の方法での免疫組織化学において用いることができる。例えば、外科手術の間に患者から得た組織や、自然に又はトランスフェクション後にCAPRIN-1を発現する細胞系を接種した異種移植組織を担持する動物から得た組織を、パラホルムアルデヒド又はアセトン固定して得られた凍結切片、又はパラホルムアルデヒドで固定したパラフィン包埋した組織切片を使用して、CAPRIN-1との反応性に関して試験することができる。
本発明の癌の治療及び/又は予防のための医薬組成物の標的は、CAPRIN-1遺伝子を発現する癌(細胞)であれば特に限定されない。
本発明はさらに、本発明の上記抗体をコードするDNA、あるいは、上記抗体の重鎖又は軽鎖をコードするDNA、あるいは、上記抗体の重鎖又は軽鎖の可変領域をコードするDNAも提供する。そのようなDNAは、例えば抗体(a)の場合、配列番号1、2及び3のアミノ酸配列をコードする塩基配列を含む重鎖可変領域をコードするDNA、配列番号4、5及び6のアミノ酸配列をコードする塩基配列を含む軽鎖可変領域をコードするDNA、などを含む。
上で説明した本発明を以下に要約する。
WO2010/016526の実施例3で調製したヒトCAPRIN-1タンパク質300μgを等量のフロイントの完全アジュバントと混合し、これをウサギ1羽当たりの抗原溶液とした。2回目以降の免疫にはフロインとの不完全アジュバントと混合したものを使用した。抗原溶液を12週齢のウサギの腹腔内に投与後、2~3週間毎に8回投与を行って免疫を完了した。最後の免疫から4日後に摘出したそれぞれの脾臓からリンパ球を得、ウサギのミエローマ細胞240E-W2と1:2の比率にて混和し、そこに37℃に加温した10% FBSを含むRPMI培地200μLとPEG1500を800μLを混和して調製したPEG溶液を加えて、5分間静置して細胞融合を行った。遠心して上清を除去後、HAT溶液を2%当量加えた10%のFBSを含むRPMI培地(HAT選択培地)300mLで細胞を懸濁し、96穴プレートの1ウェル当たり100μLずつ、プレート80枚に播種した。7日間、37℃、5% CO2の条件で培養することで、脾臓細胞とウサギミエローマ細胞が融合したハイブリドーマを得た。
実施例1で確認されたウサギ抗CAPRIN-1モノクローナル抗体の配列番号20で表される重鎖可変領域のアミノ酸配列を発現させるための遺伝子と、配列番号21で表される軽鎖可変領域を発現させるための遺伝子とを、それぞれヒトIgG1の重鎖定常領域が挿入された哺乳類細胞発現用ベクターとヒトIgG1の軽鎖定常領域が挿入された哺乳類細胞発現用ベクターに挿入した。作製した2つの組み換え発現ベクターを常法に従って哺乳類細胞に導入してヒト-ウサギキメラ抗CAPRIN-1抗体(ヒト-ウサギキメラ抗体)を含む培養上清を得た。得られたキメラ化抗体を含む培養上清を常法に従ってHitrap Protein A SepharoseFF(GEヘルスケア社製)を用いて精製し、PBS(-)に置換して0.22μmのフィルター(ミリポア社製)で濾過したものを調製した。
次に、実施例1で確認されたウサギ抗CAPRIN-1モノクローナル抗体の重鎖可変領域中のCDR1~3ならびに軽鎖可変領域中のCDR1~3のアミノ酸配列と塩基配列の情報を基に、重鎖可変領域のCDR1~3がそれぞれ配列番号1、配列番号2及び配列番号3のアミノ酸配列からなる配列番号7で表される重鎖可変領域のアミノ酸配列を発現できるように塩基配列を設計し、これをヒトIgG1の重鎖定常領域が挿入された哺乳類細胞発現用ベクターに挿入した。同様にして、軽鎖可変領域のCDR1~3がそれぞれ配列番号4、配列番号5及び配列番号6のアミノ酸配列からなる配列番号11で表される軽鎖可変領域のアミノ酸配列を発現できるように塩基配列を設計し、これをヒトIgG1の軽鎖定常領域が挿入された哺乳類細胞発現用ベクターに挿入した。上記2つの組換え発現ベクターを常法に従って哺乳類細胞に導入して、配列番号7で表される重鎖全長アミノ酸配列と配列番号11で表される軽鎖全長アミノ酸配列とからなるヒト化抗体#0を含む培養上清を得た。
次に、実施例2で調製したヒト-ウサギキメラ抗体と、実施例3で調製したヒト化抗体#0~#10のCAPRIN-1タンパク質への特異的反応性を常法に従い、ELISA法で確認した。具体的には、あらかじめ5μg/mLのCAPRIN-1タンパク質を含むPBS溶液を96穴プレート1ウェル当たりに100μL添加し、4℃にて18時間静置した。各ウェルをPBS-Tで洗浄後、5%のスキムミルクを含むPBS溶液からなるブロッキング溶液を1ウェル当たり400μL添加して室温にて3時間静置した。溶液を除いて、PBS-Tでウェルを洗浄後、0.2%のスキムミルクを含むPBSで1μg/mLに調製したヒト-ウサギキメラ抗体、ヒト化抗体#0~#10を含むそれぞれの溶液を1ウェル当たり50μLずつ各ウェルに添加し、室温にて1時間静置した。陰性コントロールとして、CAPRIN-1タンパク質に反応しないことが確認されているヒトIgG抗体を同様の抗体濃度で添加したウェル、ならびに抗体を添加しないウェルを同時に用意した。PBS-Tで各ウェルを3回洗浄した後、0.2%のスキムミルクを含むPBSで3000倍に希釈したHRP標識抗ヒトIgG抗体を1ウェル当たり50μL添加して室温にて1時間静置した。PBS-Tでウェルを3回洗浄した後、TMB基質溶液(Thermo社製)を1ウェル当たり100μL添加して1~30分間静置して発色反応を行った。発色後、1規定硫酸を1ウェル当たり100μL添加して反応を停止させ、吸光度計を用いて450nmと630nmの吸光度値を測定した。また、同時にCAPRIN-1タンパク質を固相していないウェル(非固相ウェル)も用意して、同様に各抗体を添加して測定を行った。その結果、陰性コントロールとして用いたCAPRIN-1タンパク質に反応しないことが確認されているヒトIgG抗体を添加したウェルの吸光度値は、抗体を添加していないウェルと同等に低値であったのに対して、ヒト-ウサギキメラ抗体及びヒト化抗体#0~#10をそれぞれ添加したウェルの吸光度値は同等に高い値を示した。また、CAPRIN-1タンパク質を固相していないウェルに対してヒト-ウサギキメラ抗体及びヒト化抗体#0~#10は陰性コントロールと同等の吸光度値しか示さなかった。この結果から、ヒト-ウサギキメラ抗体及びヒト化抗体#0~#10はCAPRIN-1タンパク質に特異的に反応することが確認された。
次に、実施例2で調製したヒト-ウサギキメラ抗体と、実施例3で調製したヒト化抗体#0~#10の各種ヒト癌細胞に対する抗腫瘍効果をADCC活性で評価した。
実施例3で得たヒト化抗体#0、#2、#3、#4、#5、#6、#7、#8、#9、#10の重鎖定常領域中の一部アミノ酸が置換された配列番号33に記載の重鎖定常領域を有する抗CAPRIN-1抗体(以下改I型抗CAPRIN-1抗体と記載する)の作製を行った。上記重鎖定常領域と配列番号7で表される重鎖可変領域を有する重鎖アミノ酸配列をコードするDNAを合成し、これを常法に従って哺乳類細胞発現用ベクターに挿入した。また、配列番号11で表される軽鎖可変領域のアミノ酸をコードするDNAをヒトIgG1の軽鎖定常領域をコードする遺伝子が挿入された哺乳類細胞発現用ベクターに挿入されたものを準備した。作製した2つの組み換え発現ベクターを常法に従って哺乳類細胞に導入してヒト化抗体#0の改I型抗CAPRIN-1抗体#0の培養上清を得た。さらに実施例3に記載のヒト化抗体#1、#2、#3、#4、#5、#6、#7、#8、#9、#10についても上記と同様の方法で改I型抗CAPRIN-1抗体#1、#2、#3、#4、#5、#6、#7、#8、#9、#10を含む培養上清をそれぞれ得た。得られた改I型抗CAPRIN-1抗体#0~#10を含む各培養上清を常法に従ってHitrap Protein A SepharoseFF(GEヘルスケア社製)を用いて精製し、PBS(-)に置換して0.22μmのフィルター(ミリポア社製)で濾過したものを調製した。
次に、実施例3で得たヒト化抗体#0、#1、#2、#3、#4、#5、#6、#7、#8、#9、#10の重鎖定常領域に結合する全N-グリコシド結合糖鎖のうち、糖鎖還元末端のN-アセチルグルコサミンにフコースが結合していない糖鎖を有する抗CAPRIN-1抗体(以下改III型抗CAPRIN-1抗体と記載する)を以下の方法にて得た。常法に従ってGDP-6-デオキシ-D-リキソ-4-ヘキスロースをGDP-L-フコースへと変換する反応を触媒しない酵素であるGDP-6-デオキシ-D-リキソ-4-ヘキスロースレダクターゼ(RMD)遺伝子を組み込んだネオマイシン耐性遺伝子を含む哺乳類細胞発現ベクターを遺伝子導入試薬FreeStyleTM MAX Reagent(Life techonologies)を用いて哺乳類細胞株CHO細胞に導入した。上記遺伝子を導入したCHO細胞をG-418を含んだ培養液で培養してRMDが発現しているCHO細胞のstable poolを作製した。このstable poolから限外希釈法によってRMDが恒常的に発現しているCHO細胞を7個クローニングした。クローニングした7個の各RMD-CHO細胞でのRMD遺伝子発現量を定量PCR法で1週間おきに3回評価し、RMD遺伝子が恒常的に安定発現しているCHO細胞(RMD-CHO細胞)を選定した。恒常的にRMDを発現する上記RMD-CHO細胞へ、実施例3と同様に、配列番号7で表される重鎖可変領域のアミノ酸配列をコードする遺伝子と、配列番号11で表される軽鎖可変領域のアミノ酸をコードする遺伝子とを、それぞれヒトIgG1の重鎖定常領域が挿入された哺乳類細胞発現用ベクターとヒトIgG1の軽鎖定常領域が挿入された哺乳類細胞発現用ベクターをそれぞれ常法に従って導入して、改III型抗CAPRIN-1抗体#0を含む培養上清を得た。さらに実施例3に記載のヒト化抗体#1、#2、#3、#4、#5、#6、#7、#8、#9、#10についても上記と同様の方法で改III型抗CAPRIN-1抗体#1、#2、#3、#4、#5、#6、#7、#8、#9、#10を含む培養上清をそれぞれ得た。得られた改III型抗CAPRIN-1抗体#0~#10を含む各培養上清を常法に従ってHitrap Protein A SepharoseFF(GEヘルスケア社製)を用いて精製し、PBS(-)に置換して0.22μmのフィルター(ミリポア社製)で濾過したものを調製して改III型抗CAPRIN-1抗体#0を含む抗体組成物を得た。同様にして改III型抗CAPRIN-1抗体#1~#10を含む抗体精製物を得た。精製されたこれら抗体組成物中に含まれる重鎖定常領域に結合する全N-グリコシド結合糖鎖のうち、糖鎖還元末端のN-アセチルグルコサミンにフコースが結合していない糖鎖を有する抗CAPRIN-1抗体の割合をLabChip(登録商標)GXII(PerkinElmer社)で評価した結果いずれも80%以上であった。
次に、実施例3に記載のヒト化抗体#0、#1、#2、#3、#4、#5、#6、#7、#8、#9、#10の重鎖定常領域中の一部アミノ酸が置換された配列番号34記載の重鎖定常領域を有し、且つ抗体の重鎖定常領域に結合する全N-グリコシド結合糖鎖のうち、糖鎖還元末端のN-アセチルグルコサミンにフコースが結合していない糖鎖を有する抗CAPRIN-1抗体(以下改IV型抗CAPRIN-1抗体と記載する)の作製を行った。実施例6-2で作製した恒常的にGDP-6-デオキシ-D-リキソ-4-ヘキスロースレダクターゼ(RMD)を発現するRMD-CHO細胞へ、実施例6-1で作製した変異型重鎖定常領域と配列番号7で表されるヒトIgG1の重鎖可変領域を有する重鎖アミノ酸配列をコードするDNAを合成しこれを常法に従って挿入した哺乳類細胞発現用ベクターと、配列番号11で表される軽鎖可変領域のアミノ酸をコードするDNAを合成し、ヒトIgG1の軽鎖定常領域のアミノ酸をコードする遺伝子が挿入された哺乳類細胞発現用ベクターを導入してヒト化抗体#0の改IV型抗CAPRIN-1抗体#0の培養上清を得た。さらに実施例3に記載のヒト化抗体#1、#2、#3、#4、#5、#6、#7、#8、#9、#10についても上記と同様の方法で改IV型抗CAPRIN-1抗体#1、#2、#3、#4、#5、#6、#7、#8、#9、#10を含む培養上清をそれぞれ得た。得られた改IV型抗CAPRIN-1抗体#0~#10を含む各培養上清を常法に従ってHitrap Protein A SepharoseFF(GEヘルスケア社製)を用いて精製し、PBS(-)に置換して0.22μmのフィルター(ミリポア社製)で濾過して改IV型抗CAPRIN-1抗体#0を含む抗体組成物を得た。同様にして改IV型抗CAPRIN-1抗体#1~#10を含む抗体精製物を得た。精製されたこれら抗体組成物中に含まれる重鎖定常領域に結合する全N-グリコシド結合糖鎖のうち、糖鎖還元末端のN-アセチルグルコサミンにフコースが結合していない糖鎖を有する抗CAPRIN-1抗体の割合をLabChip(登録商標)GXII(PerkinElmer社)で評価した結果いずれも80%以上であった。
実施例6-1~3で調製した改I型抗CAPRIN-1抗体#0~#10、改II型抗CAPRIN-1抗体#0~#10、改III型抗CAPRIN-1抗体#0~#10を含む各抗体組成物及び改抗IV型CAPRIN-1抗体#0~#10を含む各抗体組成物(以下改変型抗CAPRIN-1抗体と記載する)のCAPRIN-1タンパク質への特異的反応性を実施例4と同様の方法で確認した。その結果、陰性コントロールとして用いたCAPRIN-1タンパク質に反応しないことが確認されているヒトIgG抗体を添加したウェルの吸光度値は、抗体を添加していないウェルと同等に低値であったのに対して、各改変型抗CAPRIN-1抗体をそれぞれ添加したウェルの吸光度値は全て同等に高い値を示した。また、CAPRIN-1タンパク質を固相していないウェルに対して全ての改変型抗CAPRIN-1抗体は陰性コントロールと同等の吸光度値しか示さなかった。この結果から、全ての改変型抗CAPRIN-1抗体はCAPRIN-1タンパク質に特異的に反応することが確認された。
実施例6-1~6-3で調製した改変型抗CAPRIN-1抗体(改I型抗CAPRIN-1抗体#0~#10、改II型抗CAPRIN-1抗体#0~#10、改III型抗CAPRIN-1抗体#0~#10を含む各抗体組成物及び改IV型抗CAPRIN-1抗体#0~#10を含む各抗体組成物)の各種ヒト癌細胞に対する抗腫瘍効果を実施例5と同様にADCC活性でそれぞれ評価した。陰性コントロールとして、アイソタイプコントロール抗体を添加したウェル、抗体を添加していないウェル及びCAPRIN-1タンパク質には反応するが、CAPRIN-1が発現するヒト癌細胞表面に反応性を示さない抗体を添加したウェルを用意した。比較抗体として、改変する前の各抗CAPRIN-1抗体であるヒト化抗体#0~#10を用いた。各抗体は、最終濃度が0.01~1μg/mLとなるようにV底96穴プレートに添加した。
Claims (24)
- 配列番号1、2及び3の相補性決定領域を含む重鎖可変領域と配列番号4、5及び6の相補性決定領域を含む軽鎖可変領域とを含み、かつ、CAPRIN-1タンパク質と免疫学的反応性を有する抗体又はそのフラグメント。
- 重鎖可変領域が配列番号8のアミノ酸配列を含み、かつ、軽鎖可変領域が配列番号15のアミノ酸配列を含んでなる請求項1に記載の抗体又はそのフラグメント。
- 重鎖可変領域が配列番号10のアミノ酸配列を含み、かつ、軽鎖可変領域が配列番号15のアミノ酸配列を含んでなる請求項1に記載の抗体又はそのフラグメント。
- 重鎖可変領域が配列番号7のアミノ酸配列を含み、かつ、軽鎖可変領域が配列番号15のアミノ酸配列を含んでなる請求項1に記載の抗体又はそのフラグメント。
- 重鎖可変領域が配列番号8のアミノ酸配列を含み、かつ、軽鎖可変領域が配列番号13のアミノ酸配列を含んでなる請求項1に記載の抗体又はそのフラグメント。
- 重鎖可変領域が配列番号7のアミノ酸配列を含み、かつ、軽鎖可変領域が配列番号12のアミノ酸配列を含んでなる請求項1に記載の抗体又はそのフラグメント。
- 重鎖可変領域が配列番号8のアミノ酸配列を含み、かつ、軽鎖可変領域が配列番号12のアミノ酸配列を含んでなる請求項1に記載の抗体又はそのフラグメント。
- 重鎖可変領域が配列番号7のアミノ酸配列を含み、かつ、軽鎖可変領域が配列番号13のアミノ酸配列を含んでなる請求項1に記載の抗体又はそのフラグメント。
- 重鎖可変領域が配列番号10のアミノ酸配列を含み、かつ、軽鎖可変領域が配列番号14のアミノ酸配列を含んでなる請求項1に記載の抗体又はそのフラグメント。
- 重鎖可変領域が配列番号8のアミノ酸配列を含み、かつ、軽鎖可変領域が配列番号11のアミノ酸配列を含んでなる請求項1に記載の抗体又はそのフラグメント。
- 重鎖可変領域が配列番号7のアミノ酸配列を含み、かつ、軽鎖可変領域が配列番号11のアミノ酸配列を含んでなる請求項1に記載の抗体又はそのフラグメント。
- 重鎖可変領域が配列番号9のアミノ酸配列を含み、かつ、軽鎖可変領域が配列番号15のアミノ酸配列を含んでなる請求項1に記載の抗体又はそのフラグメント。
- 重鎖可変領域が配列番号20のアミノ酸配列を含み、かつ、軽鎖可変領域が配列番号21のアミノ酸配列を含んでなる請求項1に記載の抗体又はそのフラグメント。
- ヒト抗体、ヒト化抗体、キメラ抗体、単鎖抗体又は多重特異性抗体である、請求項1~13のいずれか1項に記載の抗体又はそのフラグメント。
- 抗腫瘍剤がコンジュゲートされた請求項1~13のいずれか1項に記載の抗体又はそのフラグメント。
- 前記抗体の重鎖定常領域に1もしくは複数個のアミノ酸置換を含む、請求項1~15のいずれか1項に記載の抗体。
- 前記抗体が、重鎖定常領域に結合するN-グリコシド結合糖鎖の糖鎖還元末端のN-アセチルグルコサミンに結合したフコースを除去した抗体である、請求項1~16のいずれか1項に記載の抗体。
- 前記抗体の組成物であって、請求項17に記載の抗体及び重鎖定常領域に結合するN-グリコシド結合糖鎖の糖鎖還元末端のN-アセチルグルコサミンにフコースが結合した請求項1~16のいずれかに1項に記載の抗体を含む、抗体の組成物。
- 請求項17に記載の抗体又は請求項18に記載の抗体の組成物を産生する細胞。
- 請求項1~15のいずれか1項に記載の抗体又はそのフラグメント、請求項16又は17に記載の抗体、あるいは請求項18に記載の抗体の組成物を有効成分として含むことを特徴とする、癌の治療及び/又は予防のための医薬組成物。
- 前記癌が乳癌、腎癌、膵臓癌、大腸癌、肺癌、脳腫瘍、胃癌、子宮癌、卵巣癌、前立腺癌、膀胱癌、食道癌、白血病、リンパ腫、肝臓癌、胆嚢癌、肉腫、肥満細胞腫、メラノーマ、副腎皮質癌、ユーイング腫瘍、ホジキンリンパ腫、中皮腫、多発性骨髄腫、睾丸癌、甲状腺癌又は頭頸部癌である、請求項20に記載の医薬組成物。
- 請求項20又は21に記載の医薬組成物と、抗腫瘍剤を含む医薬組成物とを含んでなる、癌の治療及び/又は予防のための組み合わせ医薬品。
- 請求項1~16のいずれか1項に記載の抗体又はそのフラグメントをコードするDNA。
- 請求項1~16のいずれか1項に記載の抗体又はそのフラグメント、請求項17に記載の抗体、請求項18に記載の抗体の組成物、請求項20又は21に記載の医薬組成物、あるいは請求項22に記載の組み合わせ医薬品を、被験者に投与することを含む、癌の治療及び/又は予防方法。
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RU2016107884A RU2678138C2 (ru) | 2013-08-09 | 2014-08-08 | Фармацевтическая композиция для лечения и/или профилактики рака |
BR112016001753-6A BR112016001753B1 (pt) | 2013-08-09 | 2014-08-08 | Anticorpo, composição de anticorpo, composição farmacêutica, dna e uso de um anticorpo |
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Also Published As
Publication number | Publication date |
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MX360671B (es) | 2018-11-13 |
PT3031826T (pt) | 2019-01-18 |
KR102255616B1 (ko) | 2021-05-25 |
EP3031826A4 (en) | 2017-03-29 |
RU2678138C2 (ru) | 2019-01-23 |
US20160297889A1 (en) | 2016-10-13 |
CN105452294B (zh) | 2019-08-02 |
PL3031826T3 (pl) | 2019-03-29 |
CA2918989A1 (en) | 2015-02-12 |
ES2704909T3 (es) | 2019-03-20 |
BR112016001753B1 (pt) | 2023-10-03 |
RU2016107884A (ru) | 2017-09-14 |
CA2918989C (en) | 2021-11-02 |
HUE042081T2 (hu) | 2019-06-28 |
AU2014303375B2 (en) | 2019-07-04 |
EP3031826A1 (en) | 2016-06-15 |
MX2016001640A (es) | 2016-06-02 |
US9862774B2 (en) | 2018-01-09 |
CN105452294A (zh) | 2016-03-30 |
DK3031826T3 (en) | 2018-12-17 |
EP3031826B1 (en) | 2018-10-10 |
TR201819812T4 (tr) | 2019-01-21 |
BR112016001753A2 (pt) | 2017-08-29 |
JP6447130B2 (ja) | 2019-01-09 |
KR20160038892A (ko) | 2016-04-07 |
AU2014303375A1 (en) | 2016-03-03 |
JPWO2015020212A1 (ja) | 2017-03-02 |
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