WO2009148148A1 - 神経浸潤抑制剤 - Google Patents
神経浸潤抑制剤 Download PDFInfo
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- WO2009148148A1 WO2009148148A1 PCT/JP2009/060314 JP2009060314W WO2009148148A1 WO 2009148148 A1 WO2009148148 A1 WO 2009148148A1 JP 2009060314 W JP2009060314 W JP 2009060314W WO 2009148148 A1 WO2009148148 A1 WO 2009148148A1
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- antibody
- inhibitor
- nerve
- receptor
- pancreatic cancer
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Classifications
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
- C07K16/18—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans
- C07K16/28—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
- C07K16/2866—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against receptors for cytokines, lymphokines, interferons
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K39/00—Medicinal preparations containing antigens or antibodies
- A61K39/0005—Vertebrate antigens
- A61K39/0011—Cancer antigens
- A61K39/001102—Receptors, cell surface antigens or cell surface determinants
- A61K39/001116—Receptors for cytokines
- A61K39/001119—Receptors for interleukins [IL]
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P1/00—Drugs for disorders of the alimentary tract or the digestive system
- A61P1/18—Drugs for disorders of the alimentary tract or the digestive system for pancreatic disorders, e.g. pancreatic enzymes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P25/00—Drugs for disorders of the nervous system
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P35/00—Antineoplastic agents
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K39/00—Medicinal preparations containing antigens or antibodies
- A61K2039/505—Medicinal preparations containing antigens or antibodies comprising antibodies
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2317/00—Immunoglobulins specific features
- C07K2317/20—Immunoglobulins specific features characterized by taxonomic origin
- C07K2317/24—Immunoglobulins specific features characterized by taxonomic origin containing regions, domains or residues from different species, e.g. chimeric, humanized or veneered
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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
- C07K2317/76—Antagonist effect on antigen, e.g. neutralization or inhibition of binding
Definitions
- the present invention relates to a nerve infiltration inhibitor. More specifically, the present invention relates to a nerve infiltration suppressor comprising an interleukin 6 (IL-6) inhibitor as an active ingredient.
- IL-6 interleukin 6
- Interleukin 6 is a cytokine also called B cell stimulating factor 2 (BSF2) or interferon ⁇ 2.
- BSF2 B cell stimulating factor 2
- IL-6 was discovered as a differentiation factor involved in the activation of B lymphocyte cells (Non-patent Document 1), and subsequently became a multifunctional cytokine that affects the functions of various cells. (Non-patent document 2).
- IL-6 has been reported to induce maturation of T lymphocyte cells (Non-patent Document 3).
- IL-6 transmits its biological activity through two kinds of proteins on cells.
- One is IL-6 receptor, a ligand-binding protein having a molecular weight of about 80 kD to which IL-6 binds (Non-patent Documents 4 and 5).
- IL-6 receptor exists as a soluble IL-6 receptor mainly composed of the extracellular region in addition to the membrane-bound type that penetrates the cell membrane and is expressed on the cell membrane.
- the other is a membrane protein gp130 with a molecular weight of about 130 kD involved in non-ligand binding signaling.
- IL-6 and IL-6 receptor form an IL-6 / IL-6 receptor complex, and then bind to gp130, thereby transmitting the biological activity of IL-6 into the cell (non- Patent Document 6).
- Pancreatic cancer is diagnosed in an advanced state in which many cases are still unresectable even today, and in many cases of resection that can be expected to be cured, many relapse early after surgery. In addition, cases that cannot be excised and have good performance status (PS) and major organ functions are indicated for chemotherapy, but even the current standard treatment is not sufficient for its therapeutic effect. For example, even for gemcitabine hydrochloride, which is positioned as a first-line drug, the effective rate of symptom relief is 23.8%, the median survival time is 5.7 months, and the 1-year survival rate is 18% (overseas clinical phase 3 study). Result). In Japan, 20,000 people are diagnosed with pancreatic cancer annually, and the number of deaths is 22,260 (2004, population dynamics survey by the Ministry of Health, Labor and Welfare), ranking fifth by cancer cause.
- Nerve invasion is one of the characteristic invasion patterns of pancreatic cancer. Nerve invasion is found in almost 100% of pancreatic cancers. Nerve infiltration is an important prognostic factor. In the past, the present inventors have clarified that correlates with cachexia symptoms such as anemia, decreased performance status (PS) and malnutrition. In addition, there are some reports that nerve invasion is caused by cancer pain, and that certain symptom control was obtained by irradiation of nerve infiltrating sites or by excision of nerves located above them. However, since little is known about the mechanism of nerve invasion and the mechanism of manifestation of symptoms caused by nerve invasion, there is currently little knowledge about the control of nerve infiltration and the control of symptoms caused by nerve invasion. On the other hand, nerve invasion is widely recognized regardless of the type of cancer, and has been reported as a prognostic factor in prostate cancer, and has been reported as a prognostic factor in prostate cancer, and has been reported as a prognostic factor in prostate cancer, and has been reported as a prognostic factor in prostate cancer, gas
- the present invention is to provide a novel nerve infiltration inhibitor.
- the present invention also provides a novel therapeutic agent for pancreatic cancer.
- the present inventors have found that nerve invasion is suppressed by inhibiting IL-6 in a nerve invasion model of pancreatic cancer, and the present invention has been completed. Furthermore, IL-6 receptor is expressed in human pancreatic cancer cell lines, and IL-6 enhances chemotaxis and migration of pancreatic cancer cells and intracellular signals. It was found that pancreatic cancer can be treated by inhibiting. Furthermore, it discovered that human pancreatic cancer nerve invasion could be suppressed by administering an IL-6 inhibitor to a mouse nerve invasion model.
- the present invention provides the following [1] to [32].
- a therapeutic agent for pancreatic cancer comprising an interleukin 6 (IL-6) inhibitor as an active ingredient.
- IL-6 interleukin 6
- a cell nerve invasion inhibitor comprising an IL-6 inhibitor as an active ingredient.
- the inhibitor according to [2] which suppresses nerve invasion of cancer cells.
- the therapeutic agent or inhibitor according to [6], wherein the IL-6 inhibitor is an anti-IL-6 receptor antibody.
- the therapeutic agent or inhibitor according to [7], wherein the anti-IL-6 receptor antibody is a chimeric antibody, a humanized antibody or a human antibody.
- a method for treating pancreatic cancer comprising a step of administering an IL-6 inhibitor to a subject.
- a method for suppressing nerve invasion of cells comprising a step of administering an IL-6 inhibitor to a subject.
- the method according to [10], wherein nerve invasion of cancer cells is suppressed.
- the method of [11], wherein nerve invasion of pancreatic cancer cells is suppressed.
- the IL-6 inhibitor is an anti-IL-6 receptor antibody.
- the anti-IL-6 receptor antibody is a chimeric antibody, a humanized antibody or a human antibody.
- An IL-6 inhibitor for use in a method for treating pancreatic cancer [26] An IL-6 inhibitor for use in a method for suppressing cell nerve invasion. [27] The IL-6 inhibitor according to [26], which suppresses nerve invasion of cancer cells. [28] The IL-6 inhibitor according to [27], which suppresses nerve invasion of pancreatic cancer cells. [29] The IL-6 inhibitor according to any one of [26] to [28], which suppresses nerve infiltration to the central side. [30] The IL-6 inhibitor according to any one of [25] to [29], wherein the IL-6 inhibitor is a substance that binds to an IL-6 receptor.
- the anti-IL-6 receptor antibody is a chimeric antibody, a humanized antibody or a human antibody.
- FIG. 1 It is a figure which shows the mRNA expression level (B) of IL-6 (alpha) receptor (IL6R) mRNA expression level (A) and IL-6 (beta) receptor (gp130) in a human pancreatic cancer cell line. It is a figure which shows the result of having measured the influence on the proliferative ability, chemotaxis ability, and migration ability with respect to the human pancreatic cancer cell line of IL-6 using human recombinant IL-6.
- a and B The results of measurement of cell proliferative ability by measuring the number of cells over time
- C measurement of chemotaxis ability by chemotaxis assay
- D measurement of chemotaxis ability by wound healing assay.
- A nerve invasion model image
- B and C mouse IL-6 expression level in a nerve invasion model and other nerve injury models by RT-PCR (B) or fluorescent immunostaining (C).
- B nerve invasion model image
- C mouse IL-6 expression level in a nerve invasion model and other nerve injury models by RT-PCR (B) or fluorescent immunostaining (C).
- B nerve invasion model image
- C mouse IL-6 expression level in a nerve invasion model and other nerve injury models by RT-PCR (B) or fluorescent immunostaining (C).
- B mouse IL-6 expression level in a nerve invasion model and other nerve injury models by RT-PCR (B) or fluorescent immunostaining (C).
- B mouse IL-6 expression level in a nerve invasion model and other nerve injury models by RT-PCR
- C fluorescent immunostaining
- A It is a graph which shows the infiltration distance with time at the time of JAK inhibitor AG490 administration.
- DMSO control group
- AG490 AG490 administration group.
- B is a graph showing the infiltration distance over time when an anti-IL-6 receptor antibody is administered.
- hIgG control group
- MRA anti-IL-6 receptor antibody administration group.
- an “IL-6 inhibitor” is a substance that blocks IL-6 signaling and inhibits IL-6 biological activity.
- IL-6 inhibitors include substances that bind to IL-6, substances that bind to IL-6 receptor, substances that bind to gp130, and the like.
- IL-6 inhibitors include substances that inhibit STAT3 phosphorylation that is important as intracellular signals by IL-6, such as AG490.
- IL-6 inhibitor is not particularly limited, but anti-IL-6 antibody, anti-IL-6 receptor antibody, anti-gp130 antibody, IL-6 variant, soluble IL-6 receptor variant, IL-6 moiety Peptides, IL-6 receptor partial peptides, low molecular weight compounds exhibiting the same activity as these, and the like are included.
- an IL-6 receptor inhibitor particularly an anti-IL-6 receptor antibody can be mentioned.
- the origin of the antibody used in the present invention is not particularly limited, but is preferably derived from a mammal, more preferably a human-derived antibody.
- the antibody used in the present invention can be obtained as a polyclonal or monoclonal antibody using known means.
- a monoclonal antibody derived from a mammal is particularly preferable.
- Mammal-derived monoclonal antibodies include those produced by hybridomas and those produced by hosts transformed with expression vectors containing antibody genes by genetic engineering techniques. Usually, this antibody blocks the transmission of IL-6 biological activity into cells by binding to IL-6, IL-6 receptor, gp130, and the like.
- Monoclonal antibody-producing hybridomas can be basically produced using known techniques as follows. That is, using IL-6 receptor, IL-6, gp130, etc. as a sensitizing antigen and immunizing it according to a normal immunization method, the obtained immune cells are compared with known parental cells by a normal cell fusion method. It can be produced by fusing and screening monoclonal antibody-producing cells by a conventional screening method.
- a monoclonal antibody can be produced as follows.
- human IL-6 receptor used as a sensitizing antigen for antibody acquisition is disclosed in European Patent Application Publication No. EP 325474
- mouse IL-6 receptor is a Japanese patent. It is obtained by using the IL-6 receptor gene / amino acid sequence disclosed in Japanese Patent Application Laid-Open No. 3-155795.
- IL-6 receptor protein is expressed on the cell membrane and separated from the cell membrane (soluble IL-6 receptor) (Yasukawa, K. et al., J. Biochem. (1990) 108, 673-676).
- Soluble IL-6 receptor consists essentially of the extracellular region of IL-6 receptor bound to the cell membrane, and the membrane is characterized in that the transmembrane region or the transmembrane region and the intracellular region are defective. Different from the bound IL-6 receptor. Any IL-6 receptor may be used as the IL-6 receptor protein as long as it can be used as a sensitizing antigen for producing the anti-IL-6 receptor antibody used in the present invention.
- the target IL-6 receptor protein After inserting the gene sequence of IL-6 receptor into a known expression vector system and transforming an appropriate host cell, the target IL-6 receptor protein is known from the host cell or culture supernatant.
- the purified IL-6 receptor protein may be used as a sensitizing antigen. Further, cells expressing IL-6 receptor or fusion proteins of IL-6 receptor protein and other proteins may be used as the sensitizing antigen.
- IL-6 when used as a sensitizing antigen for obtaining an antibody, human IL-6 is expressed in Eur. J. Biochem (1987) 168, 543-550, J. Immunol. (1988) 140, 1534- It is obtained by using the IL-6 gene / amino acid sequence disclosed in 1541, or Agr. Biol. Chem. (1990) 54, 2685-2688.
- the gp130 gene / amino acid sequence disclosed in European Patent Application Publication No. EP 411946 can be used as a sensitizing antigen for obtaining an anti-gp130 antibody.
- the mammal to be immunized with the sensitizing antigen is not particularly limited, but is preferably selected in consideration of compatibility with the parent cell used for cell fusion. Animals such as mice, rats, hamsters and the like are used.
- Immunization of animals with a sensitizing antigen is performed according to a known method.
- 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 ⁇ ⁇ ) or physiological saline, etc., and then mixed with an appropriate amount of an ordinary adjuvant, for example, Freund's complete adjuvant, if necessary.
- an ordinary adjuvant for example, Freund's complete adjuvant
- it is administered to mammals several times every 4-21 days.
- an appropriate carrier can be used during immunization with the sensitizing antigen.
- immune cells are removed from the mammal and subjected to cell fusion.
- Spleen cells are particularly preferred as preferable immune cells to be subjected to cell fusion.
- Mammalian myeloma cells as the other parental cells fused with the immune cells have already been known in various known cell lines such as P3X63Ag8.653 (Kearney, J. F. et al. J. Immunol. (1979 ) (123, 1548-1550), P3X63Ag8U.1 (Current Topics, Microinology, and Microbiology, and Immunology (1978), 81, -71-7), NS-1 (Kohler., G., and Milstein, C., Eur., J., Immunol. (1976) 6, 511-519), MPC-11 (Margulies. D. H.
- the cell fusion between the immunocytes and myeloma cells is basically performed by a known method such as the method of Milstein et al. (Kohler. Ler G. and Milstein, C., Methods Enzymol. (1981) 73, 3-46). It can be done according to this.
- 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 as the fusion accelerator, 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 is preferably 1 to 10 times the number of immune cells relative to myeloma cells.
- the culture medium used for the cell fusion for example, RPMI1640 culture medium suitable for growth of the myeloma cell line, MEM culture medium, and other normal culture liquids used for this type of cell culture can be used. Serum supplements 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 solution, and a PEG solution pre-warmed to about 37 ° C., for example, a PEG solution having an average molecular weight of about 1000 to 6000 is usually used.
- the target fused cell is formed by adding and mixing at a concentration of 30 to 60% (w / v). Subsequently, cell fusion agents and the like that are undesirable for the growth of the hybridoma can be removed by adding an appropriate culture solution successively and centrifuging to remove the supernatant.
- the hybridoma 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 time sufficient for the cells other than the target hybridoma (non-fused cells) to die, usually several days to several weeks. Subsequently, a normal limiting dilution method is performed, and screening and cloning of the hybridoma producing the target antibody are performed.
- 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 time sufficient for the cells other than the target hybridoma (non-fused cells) to die, usually several days to several weeks.
- a normal limiting dilution method is performed, and screening and cloning of the hybridoma producing the target
- human lymphocytes are sensitized in vitro with a desired antigen protein or antigen-expressing cells, and sensitized B lymphocytes are human myeloma cells such as U266.
- a desired human antibody having a binding activity to a desired antigen or antigen-expressing cell can be obtained (see Japanese Patent Publication No. 1-59878).
- antigens or antigen-expressing cells may be administered to a transgenic animal having a repertoire of human antibody genes, and a desired human antibody may be obtained according to the method described above (International Patent Application Publication No. WO 93/12227, WO 92 / 03918, WO 94/02602, WO 94/25585, WO 96/34096, WO 96/33735).
- 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.
- the hybridoma is cultured according to a usual method and obtained as a culture supernatant thereof, or the hybridoma is administered to a mammal compatible therewith to proliferate, and its ascites
- the method obtained as follows is adopted.
- the former method is suitable for obtaining highly pure antibodies, while the latter method is suitable for mass production of antibodies.
- an anti-IL-6 receptor antibody-producing hybridoma can be performed by the method disclosed in JP-A-3-139293.
- a PM-1 antibody-producing hybridoma is injected into the peritoneal cavity of BALB / c mice to obtain ascites, and a method for purifying PM-1 antibody from this ascites, or the hybridoma is treated with an appropriate medium such as 10% fetal bovine serum, Culture in 5% BM-CondimedBMH1 (Boehringer Mannheim) -containing RPMI1640 medium, hybridoma SFM medium (GIBCO-BRL), PFHM-II medium (GIBCO-BRL), etc. It can be performed by a purification method.
- a recombinant antibody produced by cloning an antibody gene from a hybridoma, incorporating it into an appropriate vector, introducing it into a host, and producing it using a gene recombination technique can be used.
- a recombinant antibody produced by cloning an antibody gene from a hybridoma incorporating it into an appropriate vector, introducing it into a host, and producing it using a gene recombination technique.
- mRNA encoding the variable (V) region of the antibody is isolated from cells producing the antibody of interest, such as a hybridoma. Isolation of mRNA is performed by a known method such as guanidine ultracentrifugation (Chirgwin, winJ. M. et al., .Biochemistry (1979) 18, 5294-5299), AGPC method (Chomczynski, P. et al., .Anal. Total RNA is prepared according to Biochem. (1987) 162, (156-159), etc., and mRNA is prepared using mRNA (Purification) Kit (Pharmacia) or the like. Alternatively, mRNA can be directly prepared by using QuickPrep mRNA Purification Kit (manufactured by Pharmacia).
- the antibody V region cDNA is synthesized from the obtained mRNA using reverse transcriptase.
- cDNA synthesis can be performed using AMV Reverse Transcriptase First-strand cDNA Synthesis Kit.
- AMV Reverse Transcriptase First-strand cDNA Synthesis Kit for cDNA synthesis and amplification, 5'-Ampli mpl FINDER RACE Kit (Clontech) and 5'-RACE method using PCR (Frohman, M. A. et al., Proc. Natl. Acad. Sci. USA (1988) 85, 8998-9002; Belyavsky, A. et al., Nucleic Acids Res. (1989) 17, 2919-2932).
- the target DNA fragment is purified from the obtained PCR product and ligated with vector DNA.
- a recombinant vector is prepared from this, introduced into Escherichia coli, etc., and colonies are selected to prepare a desired recombinant vector.
- the base sequence of the target DNA is confirmed by a known method such as the deoxy method.
- 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.
- an antibody gene is incorporated into an expression vector so as to be expressed under the control of an expression control region, for example, an enhancer or a promoter, as described later.
- an expression control region for example, an enhancer or a promoter, as described later.
- host cells can be transformed with this expression vector to express the antibody.
- a recombinant antibody artificially modified for the purpose of reducing the heterologous antigenicity to humans for example, a chimeric antibody, a humanized antibody, or the like can be used.
- modified antibodies can be produced using known methods.
- a chimeric antibody can be obtained by ligating the DNA encoding the antibody V region obtained as described above with DNA encoding the human antibody C region, incorporating it into an expression vector, introducing it into a host, and producing it (Europe). (See Patent Application Publication Number EP 125023, International Patent Application Publication Number WO 92-19759). Using this known method, a chimeric antibody useful in the present invention can be obtained.
- a humanized antibody is also referred to as a reshaped human antibody or a humanized antibody, and is a non-human mammal such as a mouse antibody complementarity determining region (CDR) grafted to a human antibody complementarity determining region.
- CDR complementarity determining region
- the general genetic recombination technique is also known (see European Patent Application Publication No. EP 125023, International Patent Application Publication No. WO 92-19759).
- oligos were prepared so that the DNA sequence designed to link the CDR of the mouse antibody and the framework region (FR; framework ⁇ region) of the human antibody had a portion that overlapped the terminal part. It is synthesized from nucleotides by PCR. The obtained DNA is obtained by ligating with the DNA encoding the human antibody C region, then incorporating it into an expression vector, introducing it into a host and producing it (European patent application publication number EP 239400, international patent application publication number). (See WO 92-19759).
- the FR of the human antibody to be linked via CDR is selected such that the complementarity determining region forms a favorable antigen binding site. If necessary, the amino acid in the framework region of 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 Res. (1993) 53, 851-856).
- human antibody C region is used for chimeric antibodies and humanized antibodies.
- human antibody heavy chain C region include C ⁇ , and for example, C ⁇ 1, C ⁇ 2, C ⁇ 3, or C ⁇ 4 can be used.
- human antibody light chain C region include ⁇ or ⁇ .
- the human antibody C region may be modified in order to improve the stability of the antibody or its production.
- the chimeric antibody is composed of a variable region of a non-human mammal-derived antibody and a C region derived from a human antibody, and the humanized antibody is a complementarity determining region of a non-human mammal-derived antibody, a framework region derived from a human antibody, and C These are useful as antibodies used as pharmaceuticals because of their reduced antigenicity in the human body.
- a preferred specific example of the humanized antibody used in the present invention is a humanized PM-1 antibody (see International Patent Application Publication No. WO 92-19759).
- variable region of a human antibody can be expressed as a single chain antibody (scFv) on the surface of the phage by the phage display method, and a phage that binds to the antigen can be selected.
- scFv single chain antibody
- the DNA sequence encoding the variable region of the human antibody that binds to the antigen can be determined. If the DNA sequence of scFv that binds to the antigen is clarified, a suitable expression vector containing the sequence can be prepared and a human antibody can be obtained.
- the antibody gene constructed as described above can be expressed by a known method.
- a mammalian cell When a mammalian cell is used, it can be expressed by a commonly used useful promoter, an antibody gene to be expressed, a DNA having a poly A signal operably linked to the 3 ′ downstream thereof, or a vector containing the same.
- the promoter / enhancer includes human cytomegalovirus early promoter / enhancer (human cytomegalovirus immediate-promoter / enhancer).
- promoters / enhancers that can be used for the expression of antibodies used in the present invention include retrovirus, polyomavirus, adenovirus, simian virus 40 (SV40) and other viral promoters / enhancers and human elongation factor 1 ⁇ (HEF1 ⁇ ). Promoters / enhancers derived from mammalian cells such as
- prokaryotic cells When prokaryotic cells are used as hosts, there are production systems that use bacterial cells.
- Known bacterial cells include E. coli and Bacillus subtilis.
- Escherichia coli it can be expressed by functionally combining a commonly used useful promoter, a signal sequence for antibody secretion, and an antibody gene to be expressed.
- the promoter include lacZ promoter and araB promoter.
- the lacZ promoter the method of Ward et al. (Ward, E. S. et al., Nature (1989) 341, 544-546; Ward, E. S. et al. FASEB J. (1992) 6, 2422)
- the araB promoter the method of Better et al. (Better, M. et al. Science (1988) 240, 1041-1043) may be used.
- the pelB signal sequence (Lei, S. P. et al J. Bacteriol. (1987) 169, 4379-4383) may be used when the periplasm of E. coli is produced. After separating the antibody produced in the periplasm, the structure of the antibody is appropriately refolded and used (see, for example, WO96 / 30394).
- the origin of replication those derived from SV40, polyoma virus, adenovirus, bovine papilloma virus (BPV), etc. can be used. Furthermore, for amplification of gene copy number in the host cell system, the expression vector is used as a selection marker.
- An aminoglycoside phosphotransferase (APH) gene, a thymidine kinase (TK) gene, an E. coli xanthine guanine phosphoribosyltransferase (Ecogpt) gene, a dihydrofolate reductase (dhfr) gene and the like can be included.
- Production systems for antibody production include in vitro and in vivo production systems.
- in vitro production systems include production systems that use eukaryotic cells and production systems that use prokaryotic cells.
- Animal cells include (1) mammalian cells such as CHO, COS, myeloma, BHK (baby hamster kidney), HeLa, Vero, etc., (2) amphibian cells such as Xenopus oocytes, or (3) insects Cells such as sf9, sf21, Tn5, etc. are known.
- mammalian cells such as CHO, COS, myeloma, BHK (baby hamster kidney), HeLa, Vero, etc.
- amphibian cells such as Xenopus oocytes
- insects Cells such as sf9, sf21, Tn5, etc.
- plant cells cells derived from Nicotiana tabacum are known, and these may be cultured in callus.
- yeasts such as the genus Saccharomyces, such as Saccharomyces cerevisiae, and filamentous fungi such as the genus Aspergillus, such as Aspergillus niger, are known.
- An antibody can be obtained by introducing a desired antibody gene into these cells by transformation, and culturing the transformed cells in vitro. Culture is performed according to a known method. For example, DMEM, MEM, RPMI1640, and IMDM can be used as the culture medium, and serum supplements such as fetal calf serum (FCS) can be used in combination. Alternatively, antibodies may be produced in vivo by transferring cells into which the antibody gene has been introduced to the abdominal cavity of animals.
- FCS fetal calf serum
- examples of production systems for in vivo include production systems that use animals and production systems that use plants. When animals are used, there are production systems using mammals and insects.
- an antibody gene is introduced into these animals or plants, and antibodies are produced and collected in the animals or plants.
- an antibody gene is inserted into the middle of a gene encoding a protein inherently produced in milk such as goat ⁇ casein to prepare a fusion gene.
- a DNA fragment containing a fusion gene into which an antibody gene has been inserted is injected into a goat embryo, and the embryo is introduced into a female goat.
- the desired antibody is obtained from the milk produced by the transgenic goat born from the goat that received the embryo or its progeny.
- hormones may be used in the transgenic goat as appropriate (Ebert, KM et al., Bio / Technology (1994) 12, 699- 702).
- silkworms When silkworms are used, silkworms are infected with baculovirus into which the antibody gene of interest is inserted, and desired antibodies are obtained from body fluids of these silkworms (Maeda, S. et al., Nature (1985) 315, 592-594). ). Furthermore, when tobacco is used, the target antibody gene is inserted into a plant expression vector, for example, pMON530, and this vector is introduced into a bacterium such as Agrobacterium tumefaciens. This bacterium is infected with tobacco, for example Nicotiana tabacum, and the desired antibody is obtained from the leaves of this tobacco (Julian, K.-C. Ma et al., Eur. J. Immunol. (1994) 24, 131-138) .
- a plant expression vector for example, pMON530
- Agrobacterium tumefaciens This bacterium is infected with tobacco, for example Nicotiana tabacum, and the desired antibody is obtained
- DNAs encoding the antibody heavy chain (H chain) or light chain (L chain) are separately incorporated into an expression vector to simultaneously transform the host.
- the host may be transformed by incorporating DNAs encoding the H and L chains into a single expression vector (see International Patent Application Publication No. WO 94-11523).
- the antibody used in the present invention may be an antibody fragment or a modified product thereof as long as it can be suitably used in the present invention.
- antibody fragments include Fab, F (ab ′) 2, Fv, or single chain Fv (scFv) in which Fv of H chain and L chain are linked by an appropriate linker.
- the antibody is treated with an enzyme such as papain or pepsin to generate antibody fragments, or a gene encoding these antibody fragments is constructed and introduced into an expression vector, and then an appropriate host cell.
- an enzyme such as papain or pepsin to generate antibody fragments, or a gene encoding these antibody fragments is constructed and introduced into an expression vector, and then an appropriate host cell.
- ScFv can be obtained by linking antibody H chain V region and L chain V region.
- the H chain V region and the L chain V region are linked via a linker, preferably a peptide linker (Huston, J. S. et al., Proc. Natl. Acad. Sci. USA (1988) 85, 5879-5883).
- the H chain V region and the L chain V region in scFv may be derived from any of those described as the above antibody.
- the peptide linker that links the V regions for example, any single chain peptide consisting of amino acid residues 12-19 is used.
- the DNA encoding scFv is a DNA encoding the H chain or H chain V region of the antibody and a DNA encoding the L chain or L chain V region as a template, and a desired amino acid sequence of those sequences
- a DNA portion encoding the DNA is amplified by PCR using a primer pair that defines both ends thereof, and then further specified so that the DNA encoding the peptide linker portion and both ends thereof are linked to the H chain and L chain, respectively. Obtained by combining and amplifying primer pairs.
- an expression vector containing them and a host transformed with the expression vector can be obtained according to a conventional method, and the host can be used according to a conventional method.
- ScFv can be obtained.
- antibody fragments can be produced by the host by obtaining and expressing the gene in the same manner as described above.
- antibody as used in the present invention encompasses these antibody fragments.
- the modified antibody an antibody conjugated with various molecules such as polyethylene glycol (PEG) can also be used.
- PEG polyethylene glycol
- the “antibody” referred to in the present invention includes these modified antibodies. 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.
- the antibody produced and expressed as described above can be isolated from the inside and outside of the cell and from the host and purified to homogeneity. Separation and purification of the antibody used in the present invention can be performed by affinity chromatography.
- Examples of the column used for affinity chromatography include a protein A column and a protein G column.
- Examples of the carrier used for the protein A column include HyperD, POROS, Sepharose F.F. and the like.
- the antibodies used in the present invention can be separated and purified by appropriately selecting and combining chromatography, filters, ultrafiltration, salting out, dialysis and the like other than the affinity chromatography.
- chromatography include ion exchange chromatography, hydrophobic chromatography, gel filtration, and the like. These chromatographies can be applied to HPLC (High-performance liquid-chromatography). Further, reverse phase HPLC (reverse phase HPLC) may be used.
- the antibody concentration obtained above can be measured by measuring absorbance, ELISA, or the like. That is, in the case of measuring the absorbance, after appropriately diluting with PBS ( ⁇ ), the absorbance at 280 nm is measured, and 1 mg / ml is calculated as 1.35 OD.
- the measurement can be performed as follows. That is, 100 ⁇ l of goat anti-human IgG (manufactured by TAG) diluted to 1 ⁇ g / ml with 0.1 M bicarbonate buffer (pH 9.6) was added to a 96-well plate (manufactured by Nunc) and incubated overnight at 4 ° C. Solidify. After blocking, 100 ⁇ l of appropriately diluted antibody used in the present invention or a sample containing the antibody, or human IgG (manufactured by CAPPEL) as a standard is added, and incubated at room temperature for 1 hour.
- anti-IL-6 antibodies include, but are not limited to, MH166 (Matsuda, T. et al., Eur. J. Immunol. (1998) 18, 951-956) and SK2 antibody (Sato K et al., 21 The 21st Annual Meeting of the Japanese Society for Immunology, (1991) 21, 166).
- anti-IL-6 receptor antibodies include, but are not limited to, MR16-1 antibody (Tamura, T. et al. Proc. Natl. Acad. Sci. USA (1993) 90, 11924-11928) , PM-1 antibody (Hirata, Y. et al., J. Immunol. (1989) 143, 2900-2906), AUK12-20 antibody, AUK64-7 antibody or AUK146-15 antibody (International Patent Application Publication No. WO 92 -19759).
- PM-1 antibody is exemplified as a preferred monoclonal antibody against human IL-6 receptor
- MR16-1 antibody is exemplified as a preferred monoclonal antibody against mouse IL-6 receptor.
- a preferred example of a humanized anti-IL-6 receptor antibody is a humanized PM-1 antibody (Tocilizumab, MRA).
- Other preferred examples of the humanized anti-IL-6 receptor antibody include the antibodies described in WO2009 / 041621.
- an anti-IL-6 receptor antibody that recognizes the same epitope as that recognized by the humanized PM-1 antibody can be mentioned.
- anti-gp130 antibody examples include, but are not limited to, AM64 antibody (Japan publication JP-A-3-219894), 4B11 antibody, 2H4 antibody (US patent publication US5571513), B-P8 antibody (Japan publication publication Kaihei 8-291199).
- the IL-6 variant used in the present invention is a substance that has a binding activity to the IL-6 receptor and does not transmit the biological activity of IL-6. That is, the IL-6 variant competitively binds IL-6 to the IL-6 receptor, but does not transmit IL-6 biological activity, and therefore blocks signal transduction by IL-6.
- IL-6 variant is produced by introducing mutations by substituting amino acid residues in the amino acid sequence of IL-6.
- the origin of IL-6 which is a variant of IL-6, does not matter, but human IL-6 is preferred in consideration of antigenicity and the like.
- the amino acid sequence of IL-6 is predicted by using a known molecular modeling program such as WHATIF (Vriend et al., J. Mol. Graphics (1990) 8, 52-56). Further, it is performed by evaluating the influence on the whole of the amino acid residue to be substituted.
- IL- 6 Gene encoding the variant is obtained. This is incorporated into an appropriate expression vector as necessary, and an IL-6 variant can be obtained according to the expression, production and purification methods of the recombinant antibody.
- IL-6 variants include Brakenhoff et al., J. Biol. Chem. (1994) 269, 86-93, and Savino et al., EMBO J. (1994) 13, 1357-1367, WO Examples include IL-6 variants disclosed in 96-18648, WO96-17869.
- the IL-6 receptor partial peptide is a peptide consisting of part or all of the amino acid sequence of the region related to the binding between IL-6 and IL-6 receptor in the amino acid sequence of IL-6 receptor.
- Such peptides usually consist of 10 to 80, preferably 20 to 50, more preferably 20 to 40 amino acid residues.
- the IL-6 receptor partial peptide specifies a region related to the binding between IL-6 and IL-6 receptor in the amino acid sequence of IL-6 receptor, and a part or all of the amino acid sequence of the specified region It can be prepared by a generally known method such as a genetic engineering method or a peptide synthesis method.
- a DNA sequence encoding a desired peptide can be incorporated into an expression vector and obtained in accordance with the expression, production and purification methods of the recombinant antibody. it can.
- a method usually used in peptide synthesis for example, a solid phase synthesis method or a liquid phase synthesis method can be used.
- the solid phase synthesis method for example, an amino acid corresponding to the C-terminus of the peptide to be synthesized is bound to a support that is insoluble in an organic solvent, and the ⁇ -amino group and the side chain functional group are protected with an appropriate protecting group.
- the reaction of condensing amino acids one by one in the order from the C-terminal to the N-terminal and the reaction of removing the protecting group of the ⁇ -amino group of the amino acid or peptide bound on the resin.
- a method of stretching is used.
- Solid phase peptide synthesis methods are roughly classified into Boc method and Fmoc method depending on the type of protecting group used.
- a deprotection reaction and a cleavage reaction from the peptide chain support are performed.
- hydrogen fluoride or trifluoromethanesulfonic acid can be usually used in the Boc method
- TFA can be usually used in the Fmoc method.
- Boc method for example, the protected peptide resin is treated in hydrogen fluoride in the presence of anisole.
- the peptide is recovered by removing the protecting group and cleaving from the support. This is freeze-dried to obtain a crude peptide.
- the deprotection reaction and the cleavage reaction from the support of the peptide chain can be performed by the same operation as described above in TFA.
- the obtained crude peptide can be separated and purified by application to HPLC.
- a water-acetonitrile solvent usually used for protein purification may be used under optimum conditions.
- the fraction corresponding to the peak of the obtained chromatographic profile is collected and lyophilized.
- the peptide fraction thus purified is identified by molecular weight analysis by mass spectrum analysis, amino acid composition analysis, amino acid sequence analysis or the like.
- the IL-6 inhibitor of the present invention can be used for suppressing nerve infiltration.
- nerve invasion is a mode in which cancer cells and other cells invade and grow into nerve tissue, and may be accompanied by tissue destruction (destructive growth) and the like.
- Preferred nerve infiltration in the present invention includes cancer cell nerve infiltration.
- the target cancer type is not particularly limited, and any cancer type such as pancreatic cancer, stomach cancer, prostate cancer, head and neck cancer, breast cancer, lung cancer, colon cancer, ovarian cancer, etc. may be used, but pancreatic cancer cells It is preferable to suppress infiltration.
- Inhibition of nerve invasion may be either inhibition of nerve invasion to the peripheral side or inhibition of nerve invasion to the central side, but since pancreatic cancer cells tend to infiltrate to the central side, nerve invasion to the central side It is preferable to suppress (for example, nerve infiltration from the nerve damage site to the central side).
- “suppression of nerve invasion” means suppression of the occurrence of nerve invasion, reduction of the incidence of nerve infiltration, shortening of the distance of nerve invasion, delay of nerve invasion speed, and the like.
- the present invention also includes therapeutic agents and inhibitors for various symptoms associated with nerve infiltration, including IL-6 inhibitors.
- pancreatic cancer therapeutic agent of the present invention can be used in the treatment and / or prevention of pancreatic cancer.
- pancreatic cancer treatment means suppression of pancreatic cancer occurrence, reduction of pancreatic cancer incidence, suppression of pancreatic cancer cell growth, reduction of pancreatic cancer tissue, improvement of pancreatic cancer symptoms, suppression of pancreatic cancer metastasis, and the like.
- the effect of the IL-6 inhibitor used in the present invention can be evaluated using, for example, signal transduction inhibitory activity as an index, but is not limited thereto.
- the signal transduction inhibitory activity of an IL-6 inhibitor can be evaluated by a commonly used method. Specifically, an IL-6-dependent human myeloma line (S6B45, KPMM2), a human Rennelt T lymphoma cell line KT3, or an IL-6-dependent cell MH60.BSF2 is cultured, and IL-6 is added thereto. At the same time, the incorporation of 3 H-thymidine in IL-6-dependent cells may be measured in the presence of an IL-6 inhibitor.
- the subject to which the therapeutic agent or inhibitor of the present invention is administered is a mammal.
- the mammal is preferably a human.
- the therapeutic agent or inhibitor of the present invention can be administered in the form of a pharmaceutical, and can be administered systemically or locally orally or parenterally.
- intravenous injection such as infusion, intramuscular injection, intraperitoneal injection, subcutaneous injection, suppository, enema, oral enteric solvent, etc.
- the effective dose is selected in the range of 0.01 mg to 100 mg per kg body weight.
- a dose of 1-1000 mg, preferably 5-50 mg per patient can be selected.
- a preferable dose and administration method are effective doses in such an amount that free antibodies are present in the blood.
- 0.5 mg to 40 mg preferably 1 mg to 20 mg in 1 month (4 weeks) divided into 1 to several times, for example, 2 times / week, 1 time / week, 1 time / 2 weeks, 1 time / 4 weeks, etc.
- intravenous administration such as infusion or subcutaneous injection is used.
- the dosing schedule is administered twice / week or once / week to once / 2 weeks, once / 3 weeks, once / 4 weeks, while observing the patient's condition and observing blood test values. It is also possible to adjust by increasing the interval.
- a pharmaceutically acceptable carrier such as a preservative or a stabilizer may be added.
- the pharmaceutically acceptable carrier means a material that can be administered together with the above-mentioned drug. Examples of materials that are acceptable for formulation include sterilized water and physiological saline, stabilizers, excipients, buffers, preservatives, surfactants, chelating agents (EDTA, etc.), binders, and the like. .
- examples of the surfactant include nonionic surfactants such as sorbitan fatty acid esters such as sorbitan monocaprylate, sorbitan monolaurate, sorbitan monopalmitate; glycerin monocaprylate, glycerin monomyristate.
- nonionic surfactants such as sorbitan fatty acid esters such as sorbitan monocaprylate, sorbitan monolaurate, sorbitan monopalmitate; glycerin monocaprylate, glycerin monomyristate.
- Glycerin fatty acid esters such as glyceryl monostearate; polyglycerin fatty acid esters such as decaglyceryl monostearate, decaglyceryl distearate, decaglyceryl monolinoleate; polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monooleate , Polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan monopalmitate, polyoxyethylene sorbitan trioleate, polyoxyethylene Polyoxyethylene sorbitan fatty acid esters such as sorbitan tristearate; Polyoxyethylene sorbite fatty acid esters such as polyoxyethylene sorbit tetrastearate and polyoxyethylene sorbit tetraoleate; Polyoxyethylene glycerin such as polyoxyethylene glyceryl monostearate Fatty acid ester; polyethylene glycol fatty acid ester such as polyethylene glycol distearate; polyoxyethylene alkyl ether such as polyoxy
- surfactant examples include anionic surfactants such as alkyl sulfates having an alkyl group having 10 to 18 carbon atoms such as sodium cetyl sulfate, sodium lauryl sulfate, and sodium oleyl sulfate; polyoxyethylene Polyoxyethylene alkyl ether sulfates having an average addition mole number of ethylene oxide of 2 to 4 and an alkyl group of 10 to 18 carbon atoms such as sodium lauryl sulfate; Carbon atoms of the alkyl group such as sodium lauryl sulfosuccinate Typical examples include alkylsulfosuccinic acid ester salts having 8 to 18 numbers; natural surfactants such as lecithin, glycerophospholipid; fingophospholipids such as sphingomyelin; and sucrose fatty acid esters of fatty acids having 12 to 18 carbon atoms. Can be mentioned.
- anionic surfactants such as alkyl sulfates having an
- Preferred surfactants for use in the formulations of the present invention are polyoxyethylene sorbitan fatty acid esters such as polysorbate 20, 40, 60 or 80, with polysorbates 20 and 80 being particularly preferred.
- Polyoxyethylene polyoxypropylene glycol represented by poloxamer such as Pluronic F-68 (registered trademark) is also preferable.
- the amount of surfactant to be added varies depending on the type of surfactant to be used, but in the case of polysorbate 20 or polysorbate 80, it is generally 0.001 to 100 mg / mL, preferably 0.003 to 50 mg / mL. More preferably, it is 0.005 to 2 mg / mL.
- buffering agent phosphoric acid, citric acid buffer, acetic acid, malic acid, tartaric acid, succinic acid, lactic acid, potassium phosphate, gluconic acid, caprylic acid, deoxycholic acid, salicylic acid, triethanolamine, fumaric acid Other organic acids, etc., or carbonate buffer, Tris buffer, histidine buffer, imidazole buffer, etc. can be mentioned.
- a solution formulation may be prepared by dissolving in an aqueous buffer known in the field of solution formulation.
- concentration of the buffer is generally 1 to 500 mM, preferably 5 to 100 mM, and more preferably 10 to 20 mM.
- the drug of the present invention may contain other low molecular weight polypeptides, proteins such as serum albumin, gelatin and immunoglobulin, saccharides such as amino acids, polysaccharides and monosaccharides, carbohydrates, and sugar alcohols.
- proteins such as serum albumin, gelatin and immunoglobulin
- saccharides such as amino acids, polysaccharides and monosaccharides, carbohydrates, and sugar alcohols.
- amino acids in the present invention include basic amino acids such as arginine, lysine, histidine, ornithine and the like, or inorganic salts of these amino acids (preferably in the form of hydrochloride or phosphate, that is, phosphate amino acids). I can do it.
- free amino acids are used, the preferred pH value is adjusted by the addition of suitable physiologically acceptable buffer substances such as inorganic acids, especially hydrochloric acid, phosphoric acid, sulfuric acid, acetic acid, formic acid or their salts.
- suitable physiologically acceptable buffer substances such as inorganic acids, especially hydrochloric acid, phosphoric acid, sulfuric acid, acetic acid, formic acid or their salts.
- phosphate is particularly advantageous in that a particularly stable lyophilizate is obtained.
- the preparation is substantially free of organic acids such as malic acid, tartaric acid, citric acid, succinic acid, fumaric acid or the like or the corresponding anion (malate ion, tartaric acid ion, citrate ion, succinic acid ion, fumaric acid This is particularly advantageous when no acid ions or the like are present.
- organic acids such as malic acid, tartaric acid, citric acid, succinic acid, fumaric acid or the like or the corresponding anion (malate ion, tartaric acid ion, citrate ion, succinic acid ion, fumaric acid
- Preferred amino acids are arginine, lysine, histidine, or ornithine.
- acidic amino acids such as glutamic acid and aspartic acid, and their salt forms (preferably sodium salts) or neutral amino acids such as isoleucine, leucine, glycine, serine, threonine, valine, methionine, cysteine, or alanine, or aromatic Amino acids such as phenylalanine, tyrosine, tryptophan, or the derivative N-acetyltryptophan can also be used.
- saccharides and carbohydrates such as polysaccharides and monosaccharides include dextran, glucose, fructose, lactose, xylose, mannose, maltose, sucrose, trehalose, and raffinose.
- examples of the sugar alcohol include mannitol, sorbitol, inositol and the like.
- an isotonic solution containing physiological saline, glucose and other adjuvants for example, D-sorbitol, D-mannose, D-mannitol, sodium chloride
- physiological saline for example, physiological saline, glucose and other adjuvants
- D-sorbitol for example, D-mannose, D-mannitol, sodium chloride
- the aqueous solution may be used in combination with an appropriate solubilizing agent (eg, alcohol (ethanol etc.), polyalcohol (propylene glycol, PEG etc.), nonionic surfactant (polysorbate 80, HCO-50) etc.).
- solubilizing agent eg, alcohol (ethanol etc.), polyalcohol (propylene glycol, PEG etc.), nonionic surfactant (polysorbate 80, HCO-50) etc.
- it may further contain a diluent, a solubilizer, a pH adjuster, a soothing agent, a sulfur-containing reducing agent, an antioxidant and the like.
- examples of the sulfur-containing reducing agent include N-acetylcysteine, N-acetylhomocysteine, thioctic acid, thiodiglycol, thioethanolamine, thioglycerol, thiosorbitol, thioglycolic acid and salts thereof, and thiosulfuric acid.
- examples thereof include sodium, glutathione, and those having a sulfhydryl group such as thioalkanoic acid having 1 to 7 carbon atoms.
- antioxidant in the present invention examples include erythorbic acid, dibutylhydroxytoluene, butylhydroxyanisole, ⁇ -tocopherol, tocopherol acetate, L-ascorbic acid and salts thereof, L-ascorbyl palmitate, L-ascorbic acid steer.
- examples thereof include chelating agents such as rate, sodium bisulfite, sodium sulfite, triamyl gallate, propyl gallate, disodium ethylenediaminetetraacetate (EDTA), sodium pyrophosphate, and sodium metaphosphate.
- microcapsules such as hydroxymethylcellulose, gelatin, poly [methylmethacrylic acid]
- colloid drug delivery systems liposomes, albumin microspheres, microemulsions, nanoparticles, nanocapsules, etc.
- a method of making a drug a sustained-release drug is also known and can be applied to the present invention (Langer et al., J. Biomed. Mater. Res. 1981, 15: 167-277; Langer, Chem. Tech 1982, 12: 98-105; US Pat. No. 3,773,919; European Patent Application Publication (EP) 58,481; Sidman et al., Biopolymers 1983, 22: 547-556; EP 133,988).
- the pharmaceutically acceptable carrier to be used is selected appropriately or in combination from the above depending on the dosage form, but is not limited thereto.
- the present invention relates to a method for suppressing nerve invasion in a subject, comprising the step of administering an IL-6 inhibitor to a subject that has developed or is likely to develop nerve infiltration.
- the present invention also relates to a method for treating and / or preventing pancreatic cancer in a subject, comprising the step of administering an IL-6 inhibitor to a subject who has developed or is likely to develop pancreatic cancer.
- the “subject” refers to an organism to which the therapeutic agent or inhibitor of the present invention is administered, and a part of the organism.
- Organisms include, but are not limited to, animals (eg, humans, domestic animal species, wild animals).
- the “part of the living body” is not particularly limited, but preferably includes a diseased part.
- administering includes administering orally or parenterally.
- Oral administration can include administration in the form of an oral agent, and as the oral agent, a dosage form such as a granule, powder, tablet, capsule, solvent, emulsion, or suspension is selected. be able to.
- Parenteral administration can include administration in the form of injections, and injections can include subcutaneous injections, intramuscular injections, intraperitoneal injections, and the like.
- the effect of the method of the present invention can be achieved by introducing a gene containing an oligonucleotide to be administered into a living body using a gene therapy technique.
- the agent of the present invention can be locally administered to an area where treatment is desired. For example, it can be administered by local injection during surgery, the use of a catheter, or targeted gene delivery of DNA encoding a peptide of the invention.
- the agent of the present invention is administered as part of a pharmaceutical composition together with at least one other agent (eg, other nerve invasion inhibitor or other pancreatic cancer therapeutic agent). Also good.
- the agent of the present invention and the other agent may be administered substantially simultaneously.
- ⁇ Materials and methods> Cellular human pancreatic cancer cell lines, Capan-1 and BxPC-3, were purchased from the American Type Culture Collection (ATCC) and cultured and passaged at 37 degrees and 5% CO 2 according to the manual recommended by ATCC. This was carried out using a thermostatic bath capable of maintaining the temperature.
- ATCC American Type Culture Collection
- Cell count cells were collected from the dish, and viable cells were counted using trypan blue and a hemocytometer.
- Chemotaxis assay Cell culture insert (BD Falcon) having a pore of 8 ⁇ m on the bottom was inserted into 24 wells, and the cell culture insert was used as the upper chamber and the well as the lower chamber. 600 ⁇ l of hrIL6 vehicle 0, 1, 10, 100 ng / ml prepared using non-serum culture medium and human recombinant IL-6 (hrIL6) (R & D systems) is injected into the lower chamber, and 2 ⁇ 10 6 in the upper chamber 100 ⁇ l of / ml cell suspension was injected. After culturing for 24 hours, the number of cells that passed through the pore was counted. The measurement was performed 12 times in each group, and the number obtained by dividing the average number of cells passing through the pore with hrIL 60 ng / ml was recorded as a correction value.
- Wound healing assay 3 ⁇ 10 5 cells in 24-well / ml of cell suspension was injected by 1 ml and cultured for 24 hours. After exchanging with non-serum medium and culturing for 24 hours, scrape the center part of the well with a glass rod to make a cell-free area, measure its width, and media to hrIL6 vehicle 0, 1, 10, 100 ng / ml Replace. After culturing for 24 hours, the change in the width of the cell-free region was measured. The measurement was performed 12 times in each group, and the number obtained by dividing the average change length in hrIL 60 ng / ml was recorded as a correction value.
- the primary antibodies used for the antibody western blot were anti-phosphorylated STAT3 antibody (Santa Cruz), anti-STAT3 antibody (Santa Cruz), anti-phosphorylated Erk1 / 2 antibody (Cell Signaling), anti-Erk1 / 2 antibody (Cell Signaling), They were anti-phosphorylated Akt antibody (Cell Signaling), anti-Akt antibody (Cell Signaling), and anti-Actin antibody (Santa Cruz).
- Primary antibodies used for fluorescent immunostaining were anti-S100 antibody (DAKO) and anti-mouse IL-6 antibody (Santa Cruz), and nuclear staining was DRAQ5 (AXXORA).
- Anti-phosphorylated STAT3 antibody (Santa Cruz) was used for immunostaining.
- a cell lysate was prepared using Western blot lysate buffer (20 mM Hepes-NaOH pH 7.0, 0.5% NP-40, 15% Glycerol, 300 mM NaCl, 1 mM EDTA, 10 mM NaF). After measuring protein concentration using BCA Protein Assay Kit (PIERCE), electrolyze cell lysate containing 20 mg of protein using 7.5% or 12% acrylamide gel, and transfer to polyvinylidene difluoride membrane (Millipore) did. Antibodies were added to the membrane and protein expression was imaged using Enhanced Chemiluminescence Reagent (Amersham Biosciences).
- Phosphorylated STAT3 immunostaining and its evaluation method Antigen activation was performed by heating in a 10 mM citrate buffer using a microwave at 95 ° C. for 10 minutes, and DAB was used for color development. As specimens, 26 sciatic nerves collected from 26 mouse nerve invasion models after 4 weeks were used. Using the central tip and the distal tip of the nerve infiltrate as the region of interest, using an objective 40x lens, the number of cancer cells per field of view and the number of phosphorylated STAT3-positive cancer cells are measured, and the labeling index is Calculated by the formula: (number of phosphorylated STAT3-positive cancer cells) / (number of cancer cells).
- the mouse used for the nerve invasion model is a 6-week-old male severe immunodeficient mouse (SCID mouse).
- Barbital 50 mg / kg is intraperitoneally administered to mice and anesthetized, the left sciatic nerve is exposed, and 2.5 ⁇ l of 1.0 ⁇ 10 4 cells / ⁇ l of cancer cell suspension is injected into the sciatic nerve using a microsyringe and 30 gauge needle Directly injected.
- the sciatic nerve into which cancer cells were injected at the time of evaluation was collected and a tissue specimen was prepared, it was left stationary in 4% paraformaldehyde at 4 ° C for 24 hours.
- the fixed sciatic nerve was sliced at a thickness of 3 ⁇ m, and hematoxylin / eosin staining or immunostaining was performed for measuring the nerve infiltration distance.
- the nerve invasion distance was measured by measuring the long axis of the entire tumor range using a slice sliced in the long axis direction of the nerve and an objective micrometer (Sankei).
- a specimen obtained by immediately pulverizing the collected tissue with a multi-bead shocker (Yasui Kikai) was used.
- RNA extraction and real time RT-PCR Total RNA was collected from cell pellets collected from Dish or crushed tissue fragments using TRIzol (Life Technologies). cDNA was synthesized from 1 ⁇ 10 3 ng of total RNA using ExScript RT reagent Kit (Takara-bio) and Takara PCR Thermal Cycler Dice (Takara-bio) according to the manual recommended by Takara-bio.
- ExScript RT reagent Kit Kit
- Takara PCR Thermal Cycler Dice Takara-bio
- Real time RT-PCR Smart Cycler II System (Cepheid) and SYBR RT-PCR kit (Takara-bio) were used.
- Primer sequences are: human IL6R: forward tgagctcagatatcgggctgaac (SEQ ID NO: 1); reverse cgtcgtggatgacacagtgatg (SEQ ID NO: 2), human gp130: forward gaagcaagtgggatcacctatgaa (SEQ ID NO: 3); reverse ctgtagccttgagtatgggforward (GA: 4) gcaccgtcaaggctgagaac (SEQ ID NO: 5); reverse atggtggtgaagacgccagt (SEQ ID NO: 6), mouse IL-6: forward ccacttcacacaagtcggaggctta (SEQ ID NO: 7); reverse
- siRNA knockdown siRNA produced by Ambion was used for knockdown of mRNA expression.
- the siRNAs used were human IL6R siRNA, human gp130 siRNA, and Negative Control # 1 siRNA. After 2 ⁇ 10 5 cancer cells were seeded in a 3.5 cm dish and cultured for 48 hours, siRNA 20 ⁇ M and DharmaFECT transfection reagent 4 (Dharmacon) 8 ⁇ l were added. Cells were collected 24 hours later and used for mRNA expression analysis or nerve invasion model.
- Example 1 Intracellular mRNA expression of IL-6 ⁇ receptor (IL6R) and IL-6 ⁇ receptor (gp130) in human pancreatic cancer cell lines was examined using real time RT-PCR. Clear expression of IL6R mRNA (FIG. 1A) and gp130 mRNA (FIG. 1B) was observed in human pancreatic cancer cell lines.
- IL6R IL-6 ⁇ receptor
- gp130 IL-6 ⁇ receptor
- Example 2 Using human recombinant IL-6, the effects of IL-6 on human pancreatic cancer cell line proliferation, chemotaxis, and migration ability were measured over time (Figs. 2A and B), chemotaxis assay ( FIG. 2C) was examined using a wound healing assay (Fig. 2D). IL-6 has no effect on cell proliferation of pancreatic cancer cell lines, but has been shown to enhance chemotaxis and migration.
- Example 3 Using human recombinant IL-6 (rhIL6), the effect of IL-6 on the intracellular signal of human pancreatic cancer cell line Capan-1 was measured using phosphorylated STAT3 (pSTAT3) (FIG. 3A), phosphorylated Erk1 / 2. (pErk1 / 2) (FIG. 3B) and phosphorylated Akt (pAkt) (FIG. 3C) were evaluated using Western blotting. The intracellular phosphorylated STAT3 protein expression was clearly increased 15 minutes after rhIL6 was added, and the phosphorylated Erk1 / 2 protein expression was clearly increased 1 hour later. There was no effect on phosphorylated Akt expression.
- pSTAT3 phosphorylated STAT3
- Erk1 / 2 phosphorylated Erk1 / 2
- FIG. 3C phosphorylated Akt
- Example 4 An important invasion mode of pancreatic cancer is nerve invasion distance. Creating a mouse nerve invasion model that reproduces nerve invasion and can measure the distance of nerve invasion is important in examining treatment methods that control the important tumor invasion mode of pancreatic cancer.
- the nerve invasion model was created by directly injecting the human pancreatic cancer cell line Capan-1 into the sciatic nerve of immunodeficient mice. Grossly, the nerve infiltrate is surface irregular and clearly thicker than the normal nerve (FIG. 4A). The histological nerve infiltration distance is clearly longer after one week than the Capan-1 intranerve diffusion distance at the time of injection, and the distance increases with time (FIG. 4B). In addition, nerve invasion progresses to the central side from the injection site (FIG. 4C), which is the same feature as human pancreatic cancer nerve invasion.
- Example 5 Human pancreatic cancer nerve invasion has been reported to damage the nerve tissue surrounding the tumor. Nerve damage has been found to increase IL-6 expression in the nerve tissue distal to the damaged area.
- mouse IL-6 (mIL6) mRNA expressed in nerve invasion central and peripheral nerve tissues (FIG. 5B) was used using a nerve invasion model. Each was evaluated by real time RT-PCR. mIL6 was highly expressed on the central side of nerve infiltration, but this tendency was not observed in other nerve injury models (FIG. 5B).
- Example 6 When the expression of phosphorylated STAT3 (pSTAT3) protein, an important intracellular signal of IL-6, in pancreatic cancer cells was examined using immunostaining, phosphorylated STAT3 expression increased in accordance with the central direction of nerve invasion. (FIG. 6). This result is consistent with the increased expression and distribution of IL-6 expression in the nerve tissue on the central side of nerve infiltration.
- pSTAT3 phosphorylated STAT3
- a nerve invasion model was created using a pancreatic cancer cell line in which siRNA was used to knock down the expression of gp130 mRNA in pancreatic cancer cells, the nerve invasion distance was suppressed (FIG. 7). This result indicates that signals through gp130 including IL-6 are important for nerve invasion.
- IL6R IL-6 receptor
- Example 9 a JAK inhibitor or an anti-IL-6 receptor antibody was administered to a mouse nerve invasion model, and the effect of these inhibitors on nerve invasion was confirmed.
- JAK inhibitor AG490 (CALBIOCHEM) that inhibits STAT3 phosphorylation was dissolved in DMSO and diluted with physiological saline to prepare AG490 solution of DMSO 1%.
- AG490 Two days after preparation of the nerve invasion model, 0.5 mg of AG490 was administered into the abdominal cavity of the mouse every day.
- the sciatic nerve into which the cancer cells were injected was collected 2 weeks after the preparation of the model, and the nerve infiltration distance was measured.
- DMSO 1% solution was administered in the same manner.
- mice used were 7 in both the AG490 group and DMSO group.
- Mouse IL-receptor antibody Choi Pharmaceutical, Tocilizumab
- mouse nerve invasion model From 1 week after model preparation, 5 ⁇ g / g of anti-IL-6 antibody-inhibiting antibody was administered twice a week. Three weeks after the model was prepared, the sciatic nerve into which cancer cells were injected was collected, and the nerve infiltration distance was measured.
- human IgG Sigma
- 5 ⁇ g / g dissolved in physiological saline was administered in the same manner.
- mice used The number of mice used was 6 in the anti-IL-6 receptor antibody group and 4 in the control group.
- Statistical analysis software used was STATVIEW 5.0. Student-t two-sided test was used to test the difference between the mean values. Error bars in the figure were created to indicate standard deviation.
- pancreatic cancer can be treated by administering an anti-IL-6 receptor antibody.
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Abstract
Description
〔1〕 インターロイキン6(IL-6)阻害剤を有効成分とする膵癌治療剤。
〔2〕 IL-6阻害剤を有効成分とする細胞の神経浸潤抑制剤。
〔3〕 癌細胞の神経浸潤を抑制することを特徴とする〔2〕に記載の抑制剤。
〔4〕 膵癌細胞の神経浸潤を抑制することを特徴とする〔3〕に記載の抑制剤。
〔5〕 中枢側への神経浸潤を抑制することを特徴とする〔2〕~〔4〕いずれかに記載の抑制剤。
〔6〕 IL-6阻害剤がIL-6受容体に結合する物質であることを特徴とする〔1〕~〔5〕いずれかに記載の治療剤又は抑制剤。
〔7〕 IL-6阻害剤が抗IL-6受容体抗体であることを特徴とする〔6〕に記載の治療剤又は抑制剤。
〔8〕 抗IL-6受容体抗体がキメラ抗体、ヒト化抗体またはヒト抗体である〔7〕に記載の治療剤又は抑制剤。
〔9〕 IL-6阻害剤を対象に投与する工程を含む、膵癌の治療方法。
〔10〕 IL-6阻害剤を対象に投与する工程を含む、細胞の神経浸潤抑制方法。
〔11〕 癌細胞の神経浸潤を抑制することを特徴とする〔10〕に記載の方法。
〔12〕 膵癌細胞の神経浸潤を抑制することを特徴とする〔11〕に記載の方法。
〔13〕 中枢側への神経浸潤を抑制することを特徴とする〔10〕~〔12〕いずれかに記載の方法。
〔14〕 IL-6阻害剤がIL-6受容体に結合する物質であることを特徴とする〔9〕~〔13〕いずれかに記載の方法。
〔15〕 IL-6阻害剤が抗IL-6受容体抗体であることを特徴とする〔14〕に記載の方法。
〔16〕 抗IL-6受容体抗体がキメラ抗体、ヒト化抗体またはヒト抗体である〔15〕に記載の方法。
〔17〕 膵癌治療剤を製造するための、IL-6阻害剤の使用。
〔18〕 細胞の神経浸潤抑制剤を製造するための、IL-6阻害剤の使用。
〔19〕 癌細胞の神経浸潤を抑制することを特徴とする〔18〕に記載の使用。
〔20〕 膵癌細胞の神経浸潤を抑制することを特徴とする〔19〕に記載の使用。
〔21〕 中枢側への神経浸潤を抑制することを特徴とする〔18〕~〔20〕いずれかに記載の使用。
〔22〕 IL-6阻害剤がIL-6受容体に結合する物質であることを特徴とする〔17〕~〔21〕いずれかに記載の使用。
〔23〕 IL-6阻害剤が抗IL-6受容体抗体であることを特徴とする〔22〕に記載の使用。
〔24〕 抗IL-6受容体抗体がキメラ抗体、ヒト化抗体またはヒト抗体である〔23〕に記載の使用。
〔25〕 膵癌を治療する方法に使用するためのIL-6阻害剤。
〔26〕 細胞の神経浸潤の抑制するための方法に使用するためのIL-6阻害剤。
〔27〕 癌細胞の神経浸潤を抑制することを特徴とする〔26〕に記載のIL-6阻害剤。
〔28〕 膵癌細胞の神経浸潤を抑制することを特徴とする〔27〕に記載のIL-6阻害剤。
〔29〕 中枢側への神経浸潤を抑制することを特徴とする〔26〕~〔28〕いずれかに記載のIL-6阻害剤。
〔30〕 IL-6阻害剤がIL-6受容体に結合する物質であることを特徴とする〔25〕~〔29〕いずれかに記載のIL-6阻害剤。
〔31〕 IL-6阻害剤が抗IL-6受容体抗体であることを特徴とする〔30〕に記載のIL-6阻害剤。
〔32〕 抗IL-6受容体抗体がキメラ抗体、ヒト化抗体またはヒト抗体である〔31〕に記載のIL-6阻害剤。
又、本発明はIL-6阻害剤を、膵癌を発症した対象または発症する可能性がある対象に投与する工程を含む、対象において膵癌を治療および/または予防する方法に関する。
細胞
ヒト膵癌細胞株である、Capan-1、BxPC-3をAmerican Type Culture Collection (ATCC)より購入し、ATCCが推奨するマニュアルに沿って、培養および継代を37度で5%CO2の条件を維持できる恒温槽を用いて行った。
細胞をdishより採取し、トリパンブルーおよび血球計測盤を用いて生細胞を計測した。
底面に8μmのポアを有するCell culture insert (BD Falcon)を24ウェルに挿入し、Cell culture insertをupper chamberとして、ウェルをlower chamberとして用いた。Lower chamberに、非血清培養液とヒトリコンビナントIL-6(hrIL6)(R&D systems)を用いて調製したhrIL6 vehicle 0、1、10、100ng/mlを600μl注入し、upper chamberに2×106個/mlの細胞浮遊液 100μlを注入した。24時間培養した後、ポアを通過した細胞数を計測した。各群12回の測定を行い、hrIL6 0ng/ mlでポアを通過する平均細胞数を除算した数を補正値として記録した。
24ウェルに3×105個/mlの細胞浮遊液を1 mlずつ注入して24時間培養する。非血清培地に交換して24時間培養した後、ウェルの中央部分をガラス棒でこすり帯状の無細胞領域を作製し、その幅を計測し、hrIL6 vehicle 0、1、10、100ng/mlに培地を交換する。24時間培養した後、無細胞領域の幅の変化を測定した。各群12回の測定を行い、hrIL6 0ng/ mlでの平均変化長を除算した数を補正値として記録した。
ウエスタンブロットに使用した一次抗体は、抗リン酸化STAT3抗体(Santa Cruz)、抗STAT3抗体(Santa Cruz)、抗リン酸化Erk1/2抗体(Cell Signaling)、抗Erk1/2抗体(Cell Signaling)、抗リン酸化Akt抗体(Cell Signaling)、抗Akt抗体(Cell Signaling)、抗Actin抗体(Santa Cruz)であった。蛍光免疫染色に用いた一次抗体は、抗S100抗体(DAKO)、抗マウスIL-6抗体(Santa Cruz)であり、核染色はDRAQ5(AXXORA)を用いた。免疫染色には、抗リン酸化STAT3抗体(Santa Cruz)を用いた。
Lysate buffer (20mM Hepes-NaOH pH7.0、0.5% NP-40、15% Glycerol、300mM NaCl、1mM EDTA、10mM NaF)を用いて細胞溶解液を作製した。蛋白濃度をBCA Protein Assay Kit (PIERCE)を用いて測定した後、20 mgの蛋白を含有する細胞溶解液を7.5%もしくは12% アクリルアミドゲルを用いて電気泳動し、polyvinylidene difluoride membrane (Millipore)に転写した。メンブレンに抗体を添加し、蛋白発現をEnhanced Chemiluminescence Reagent (Amersham Biosciences)を用いて画像化した。
抗原賦活は10mMクエン酸バッファー内で95℃ 10分間のマイクロウェーブを用いた加熱処理にて行い、発色はDABを用いた。検体として、4週経過した26匹のマウス神経浸潤モデルより採取した坐骨神経26本を用いた。神経浸潤部の中枢側先端および末梢側先端を関心領域として、対物40倍レンズを用いて、1視野当たりのがん細胞数とリン酸化STAT3陽性がん細胞数を計測してlabeling indexを次の計算式で算出した:(リン酸化STAT3陽性がん細胞数)/(がん細胞数)。
使用するマウスは、6週令、オスの重度免疫不全マウス(SCIDマウス)である。バルビタール50mg/kgをマウス腹腔内投与して麻酔し、左坐骨神経を露出して、坐骨神経内に1.0×104個/μlのがん細胞浮遊液2.5μlをマイクロシリンジおよび30ゲージ針を用いて直接注入した。評価する時期にがん細胞を注入した坐骨神経を採取し、組織標本を作製する場合には、4%パラホルムアルデヒドの中で4℃ 一昼夜の間静置して固定した。固定した前記坐骨神経は、3μmの厚みで薄切し、神経浸潤距離の測定のためヘマトキシリン・エオジン染色または、免疫染色した。神経浸潤距離の測定は、神経長軸方向に薄切された切片と対物ミクロメーター(三啓)を用い、全腫瘍範囲の長軸を計測した。組織中mRNA抽出には、採取組織をただちにマルチビーズショッカー(安井器械)で破砕した検体を用いた。
Dishより採取した細胞ペレット、もしくは破砕した組織断片をからTRIzol(Life Technologies)を用いてtotal RNAを採取した。cDNAは、1×103 ngのtotal RNAより、ExScript RT reagent Kit (Takara-bio)およびTakara PCR Thermal Cycler Dice (Takara-bio)を用いて、Takara-bio社が推奨するマニュアルに従って合成した。Real time RT-PCRは、Smart Cycler II System(Cepheid)、SYBR RT-PCR kit (Takara-bio)を用いた。プライマーは、ヒトIL-6α受容体(IL6R)、ヒトIL-6β受容体(gp130)、ヒトGAPDH、マウスIL-6、マウスEGF、マウスGAPDHのcDNAをそれぞれ特異的に増幅するプライマーを用いた。プライマー配列は、ヒトIL6R:forward tgagctcagatatcgggctgaac(配列番号:1);reverse cgtcgtggatgacacagtgatg(配列番号:2)、ヒトgp130:forward gaagcaagtgggatcacctatgaa(配列番号:3);reverse ctgtagccttgagtatgggatgga(配列番号:4)、ヒトGAPDH:forward gcaccgtcaaggctgagaac(配列番号:5);reverse atggtggtgaagacgccagt(配列番号:6)、マウスIL-6:forward ccacttcacaagtcggaggctta(配列番号:7);reverse gcaagtgcatcatcgttgttcatac(配列番号:8)、マウスEGF:forward catcatggtggtggctgtctg(配列番号:9);reverse cacttccgcttggctcatca(配列番号:10)、マウスGAPDH:forward aaatggtgaaggtcggtgtg(配列番号:11);reverse tgaaggggtcgttgatgg(配列番号:12)、であった。定量はTakara-bio社が推奨する方法にて行った。
mRNA発現のノックダウンには、Ambion社が作製したsiRNAを用いた。使用したsiRNAは、ヒトIL6R siRNA、ヒトgp130 siRNA、Negative Control#1 siRNAであった。がん細胞を3.5cm dishに2×105個撒き、48時間培養した後、siRNA 20μMおよびDharmaFECT transfection reagent 4 (Dharmacon) 8μlを加えた。24時間後に細胞を採取し、mRNA発現解析もしくは神経浸潤モデルに使用した。
解析ソフトは、STATVIEW 5.0を用いた。平均値の差の検定は、student-t両側検定を用いた。図中のエラーバーは標準偏差を示すように作成した。
ヒト膵がん細胞株における、IL-6α受容体(IL6R)およびIL-6β受容体(gp130)の細胞内mRNA発現をreal time RT-PCRを用いて検討した。ヒト膵がん細胞株において、IL6R mRNA(図1A)およびgp130 mRNA(図1B)の明瞭な発現を認めた。
ヒトリコンビナントIL-6を用いて、IL-6のヒト膵がん細胞株に対する増殖能、走化能、遊走能への影響を、細胞数の経時的計測(図2AおよびB)、chemotaxis assay(図2C)、wound healing assay(図2D)を用いて検討した。IL-6は膵がん細胞株の細胞増殖には影響を及ぼさないが、走化能および遊走能を亢進させることが明らかとなった。
ヒトリコンビナントIL-6(rhIL6)を用いて、IL-6のヒト膵がん細胞株Capan-1に対する細胞内シグナルへの影響を、リン酸化STAT3(pSTAT3)(図3A)、リン酸化Erk1/2 (pErk1/2)(図3B)、リン酸化Akt(pAkt) (図3C)についてウエスタンブロット法を用いて評価した。細胞内のリン酸化STAT3蛋白発現はrhIL6を添加して15分後に、リン酸化Erk1/2蛋白発現は1時間後にそれぞれ明らかな亢進を認めた。リン酸化Akt発現への影響は認められなかった。
膵がんの重要な浸潤様式は神経浸潤距離である。神経浸潤を再現し、かつ神経浸潤距離が計測可能なマウス神経浸潤モデルを作製することは、膵がんの重要な腫瘍浸潤様式を制御する治療法を検討する上で重要である。神経浸潤モデルは、免疫不全マウスの坐骨神経内にヒト膵がん細胞株Capan-1を直接注入することで作製された。肉眼的に、神経浸潤部は表面不整で明らかに正常神経より太い(図4A)。組織学的神経浸潤距離は、注入時Capan-1神経内拡散距離よりも、1週間後で明らかに長く、その距離は経時的に増大する(図4B)。また、神経浸潤は注入部より中枢側へ進展しており(図4C)、これはヒト膵がん神経浸潤と同一の特徴である。
ヒト膵がん神経浸潤は、腫瘍周囲の神経組織を損傷することが報告されている。神経損傷は、損傷部より末梢側の神経組織においてIL-6発現を亢進させることがわかっている。神経浸潤による神経組織のIL-6発現動態を検討するため、神経浸潤モデルを用いて、神経浸潤中枢側および末梢側の神経組織内(図5B)に発現するマウスIL-6(mIL6) mRNAをそれぞれreal time RT-PCR法にて評価した。mIL6は神経浸潤中枢側で高発現していたが、その他の神経損傷モデルではその傾向を認めなかった(図5B)。mIL6蛋白発現を蛍光免疫染色にて確認すると、シュワン細胞のマーカーであるS100陽性細胞領域に一致してIL6陽性顆粒を認めた(図5C)。神経浸潤モデルにおいてmIL6分泌細胞の一つはシュワン細胞であることが明らかとなった。また、EGFは神経損傷において高発現するとされる分子であるが、マウスEGF(mEGF) mRNA発現動態はmIL6とは異なり中枢側で高発現する傾向を認めなかった。この結果は、神経浸潤部における腫瘍-神経相互作用にはIL-6が強く関わっていることを示唆する。
IL-6の重要な細胞内シグナルであるリン酸化STAT3(pSTAT3)蛋白の膵がん細胞内発現を、免疫染色を用いて検討すると、神経浸潤中枢方向に一致してリン酸化STAT3発現が亢進していた(図6)。この結果は、神経浸潤中枢側の神経組織におけるIL-6発現の亢進と分布が一致する。
IL-6による細胞内シグナルには、gp130の介在が必要である。siRNAを用いて膵がん細胞のgp130 mRNA発現をノックダウンした膵がん細胞株を用いて神経浸潤モデルを作製すると、神経浸潤距離が抑制された(図7)。この結果は、神経浸潤には、IL-6由来を含むgp130を介するシグナルが重要であることを示す。
IL-6による細胞内シグナルには、IL-6受容体(IL6R)の介在が必要である。siRNAを用いて膵がん細胞のIL6R mRNA発現をノックダウンした膵がん細胞株を用いて神経浸潤モデルを作製すると、神経浸潤距離が抑制された(図8)。この結果は、神経浸潤には、IL-6を介するシグナルが重要であることを示す。
次に、マウス神経浸潤モデルにJAK阻害剤又は抗IL-6受容体抗体を投与し、これらの阻害剤の神経浸潤への影響を確認した。
JAK阻害剤のマウス神経浸潤モデルへの投与実験
STAT3リン酸化を阻害するJAK阻害剤 AG490(CALBIOCHEM)をDMSOに溶解し、生理食塩水で希釈し、DMSO 1%のAG490液を調製した。神経浸潤モデル作製2日後より、AG490 0.5mgをマウスの腹腔内へ連日投与し、モデル作製から2週後にがん細胞を注入した坐骨神経を採取し、神経浸潤距離を測定した。コントロール群は、DMSO 1%液を同様の方法で投与した。使用したマウスの数は、AG490群とDMSO群ともに7匹であった。
抗IL-6受容体抗体のマウス神経浸潤モデルへの投与実験
ヒトIL-6受容体を阻害する抗IL-6受容体抗体(中外製薬、トシリズマブ)を生理食塩水に溶解し、マウス神経浸潤モデルにモデル作製1週後より、抗IL-6抗体阻害抗体 5μg/gを週2回投与した。モデル作製から3週後にがん細胞を注入した坐骨神経を採取し、神経浸潤距離を測定した。コントロール群は、生理食塩水に溶解したヒトIgG(Sigma)5μg/gを同様の方法で投与した。使用したマウスの数は、抗IL-6受容体抗体群 6匹、コントロール群4匹であった。
統計解析
解析ソフトは、STATVIEW 5.0を用いた。平均値の差の検定は、student-t両側検定を用いた。図中のエラーバーは標準偏差を示すように作成した。
また、ヒトIL-6の阻害作用をするため、抗ヒトIL-6受容体抗体をがん細胞注入1週後より週2回投与を2週間継続すると、神経浸潤が抑制されることが明らかとなった(図9B)。この結果から、ヒト膵癌神経浸潤が抗ヒトIL-6受容体抗体により阻害されたと考えられる。
Claims (32)
- インターロイキン6(IL-6)阻害剤を有効成分とする膵癌治療剤。
- IL-6阻害剤を有効成分とする細胞の神経浸潤抑制剤。
- 癌細胞の神経浸潤を抑制することを特徴とする請求項2に記載の抑制剤。
- 膵癌細胞の神経浸潤を抑制することを特徴とする請求項3に記載の抑制剤。
- 中枢側への神経浸潤を抑制することを特徴とする請求項2~4いずれかに記載の抑制剤。
- IL-6阻害剤がIL-6受容体に結合する物質であることを特徴とする請求項1~5いずれかに記載の治療剤又は抑制剤。
- IL-6阻害剤が抗IL-6受容体抗体であることを特徴とする請求項6に記載の治療剤又は抑制剤。
- 抗IL-6受容体抗体がキメラ抗体、ヒト化抗体またはヒト抗体である請求項7に記載の治療剤又は抑制剤。
- IL-6阻害剤を対象に投与する工程を含む、膵癌の治療方法。
- IL-6阻害剤を対象に投与する工程を含む、細胞の神経浸潤抑制方法。
- 癌細胞の神経浸潤を抑制することを特徴とする請求項10に記載の方法。
- 膵癌細胞の神経浸潤を抑制することを特徴とする請求項11に記載の方法。
- 中枢側への神経浸潤を抑制することを特徴とする請求項10~12いずれかに記載の方法。
- IL-6阻害剤がIL-6受容体に結合する物質であることを特徴とする請求項9~13いずれかに記載の方法。
- IL-6阻害剤が抗IL-6受容体抗体であることを特徴とする請求項14に記載の方法。
- 抗IL-6受容体抗体がキメラ抗体、ヒト化抗体またはヒト抗体である請求項15に記載の方法。
- 膵癌治療剤を製造するための、IL-6阻害剤の使用。
- 細胞の神経浸潤抑制剤を製造するための、IL-6阻害剤の使用。
- 癌細胞の神経浸潤を抑制することを特徴とする請求項18に記載の使用。
- 膵癌細胞の神経浸潤を抑制することを特徴とする請求項19に記載の使用。
- 中枢側への神経浸潤を抑制することを特徴とする請求項18~20いずれかに記載の使用。
- IL-6阻害剤がIL-6受容体に結合する物質であることを特徴とする請求項17~21いずれかに記載の使用。
- IL-6阻害剤が抗IL-6受容体抗体であることを特徴とする請求項22に記載の使用。
- 抗IL-6受容体抗体がキメラ抗体、ヒト化抗体またはヒト抗体である請求項23に記載の使用。
- 膵癌を治療する方法に使用するためのIL-6阻害剤。
- 細胞の神経浸潤の抑制するための方法に使用するためのIL-6阻害剤。
- 癌細胞の神経浸潤を抑制することを特徴とする請求項26に記載のIL-6阻害剤。
- 膵癌細胞の神経浸潤を抑制することを特徴とする請求項27に記載のIL-6阻害剤。
- 中枢側への神経浸潤を抑制することを特徴とする請求項26~28いずれかに記載のIL-6阻害剤。
- IL-6阻害剤がIL-6受容体に結合する物質であることを特徴とする請求項25~29いずれかに記載のIL-6阻害剤。
- IL-6阻害剤が抗IL-6受容体抗体であることを特徴とする請求項30に記載のIL-6阻害剤。
- 抗IL-6受容体抗体がキメラ抗体、ヒト化抗体またはヒト抗体である請求項31に記載のIL-6阻害剤。
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US10717781B2 (en) | 2020-07-21 |
CA2728243A1 (en) | 2009-12-10 |
EP2305306A4 (en) | 2012-08-29 |
US20110150869A1 (en) | 2011-06-23 |
JP5544290B2 (ja) | 2014-07-09 |
CA2728243C (en) | 2020-03-10 |
CN104906581A (zh) | 2015-09-16 |
EP2305306B1 (en) | 2016-02-10 |
KR20110046399A (ko) | 2011-05-04 |
KR101665729B1 (ko) | 2016-10-12 |
TW201503898A (zh) | 2015-02-01 |
CN102256623A (zh) | 2011-11-23 |
HK1214514A1 (zh) | 2016-07-29 |
JPWO2009148148A1 (ja) | 2011-11-04 |
TW201006491A (en) | 2010-02-16 |
TWI528973B (zh) | 2016-04-11 |
EP2305306A1 (en) | 2011-04-06 |
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