WO2005056605A1 - 3量体以上の受容体を認識する改変抗体 - Google Patents
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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
- C07K16/2878—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against the NGF-receptor/TNF-receptor superfamily, e.g. CD27, CD30, CD40, CD95
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P35/00—Antineoplastic agents
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P35/00—Antineoplastic agents
- A61P35/02—Antineoplastic agents specific for leukemia
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2317/00—Immunoglobulins specific features
- C07K2317/30—Immunoglobulins specific features characterized by aspects of specificity or valency
- C07K2317/34—Identification of a linear epitope shorter than 20 amino acid residues or of a conformational epitope defined by amino acid residues
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2317/00—Immunoglobulins specific features
- C07K2317/60—Immunoglobulins specific features characterized by non-natural combinations of immunoglobulin fragments
- C07K2317/62—Immunoglobulins specific features characterized by non-natural combinations of immunoglobulin fragments comprising only variable region components
- C07K2317/622—Single chain antibody (scFv)
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2317/00—Immunoglobulins specific features
- C07K2317/60—Immunoglobulins specific features characterized by non-natural combinations of immunoglobulin fragments
- C07K2317/62—Immunoglobulins specific features characterized by non-natural combinations of immunoglobulin fragments comprising only variable region components
- C07K2317/626—Diabody or triabody
-
- 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
Definitions
- the present invention relates to an antibody against tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) receptor.
- TRAIL tumor necrosis factor-related apoptosis-inducing ligand
- TNF tumor necrosis factor
- TRAIL Tumor necrosis factor-related apoptosis-inducing ligand
- Receptors for which TRAIL exhibits affinity include TRAIL-Rl (also called DR4; see Non-Patent Document 2), TRAIL-R2 (DR5, TRICK2 or killer; see Non-Patent Documents 3-5), TRAIL-R3 (TRID, DcRl or LIT; Non-Patent Documents 3, 4, and 6) and TRAIL-R4 (TRUNDD or DcR2; see Non-Patent Documents 6 and 7) and the soluble receptor osteoprotegerin (OPG; Non-Patent Document 8).
- TRAIL-R1 and TRAIL-R2 are known to have a cytoplasmic death domain (DD).
- DD is a region involved in apoptosis signal transmission.
- the binding of a certain TRAIL to TRAIL-R1 and TRAIL-R2 induces the trimerization of TRAIL-R1 and TRAIL-R2, and the FADD / MORT-DD is added to the trimerized TRAIL-R1 and TRAIL-R2 DD.
- 1 binds and functions as an adapter molecule that induces caspase 8.
- a proteolytic cascade containing another caspase is initiated, and finally leads to cell death by apoptosis (see Non-Patent Document 9).
- TRAIL-R4 is a so-called decoy that has an extracellular domain but no domain involved in intracellular signal transduction, and does not transmit apoptotic signals. Unlike TRAIL-R1 and TRAIL-R2, which are expressed in tumor cells, TRAIL-R3 and
- TRAIL-R4 is expressed in principle in normal tissues and in tumor cells Being! /, Na! /, (See Non-Patent Documents 3-5).
- Monoclonal antibodies against the TRAIL receptor are also known.
- Griffith et al. Reported on anti-TRAIL-R1 and TRAIL-R2 antibodies that induce apoptosis in TRAIL-sensitive tumor cells and anti-TRAIL-R2 antibodies that inhibit TRAIL-induced apoptosis! (See Non-Patent Document 10).
- Chuntharaopai et al. Reported and reported an anti-TRAIL-R1 mouse monoclonal antibody (mAb) that induces apoptosis of tumor cells without any other exogenous linker (see Non-Patent Document 11).
- Antibodies against TRAIL-R1 have been confirmed to have therapeutic effects on human breast cancer, colorectal cancer, uterine cancer, etc.
- Non-Patent Document 12 Clinical development of anti-TRAIL-R2 antibody for advanced tumors is also underway.
- Patent Document 1 WO 97/01633
- Non-Patent Document 1 Wiley et al., Immunology, 1995, Vol. 3, p. 673-82
- Non-Patent Document 2 Pan et al., Science, 1997, Vol.276, p.111-3
- Non-Patent Document 3 Pan et al., Science, 1997, Vol.277, p.815-8
- Non-Patent Document 4 Sheridan et al., Science, 1997, Vol.277, p.818-21
- Non-Patent Document 5 Walczak et al., EMBO J., 1997, Vol. 16, p. 5386-97.
- Non-Patent Document 6 Degl Esposti et al., J. Exp. Med., 1997, Vol. 186, p. 1165-70
- Non-Patent Document 7 Marsters et al., Curr. Biol., 1997, Vol. 7 , p.1003-6
- Non-Patent Document 8 Emery et al., J. Biol. Chem., 1998, Vol. 273, p. 14363-7
- Non-Patent Document 9 Boder et al., Nat.Cell. Biol., 2000, Vol. 2 , p.241-3
- Non-Patent Document 10 Griffith et al., J. Immunol., 1999, Vol.162, p.2597-605
- Non-Patent Document 11 Chuntharaopai et al., J. Immunol., 2001, Vol.166, p.4891 -8
- Non-patent Document 12 Buchsbaum et al., Clin.Cancer Res., 2003, Vol. 9, p. 3731-41.
- An object of the present invention is to provide an anti-TRAIL receptor antibody exhibiting stronger agonist activity. Furthermore, the present invention is not limited to anti-TRAIL receptor antibodies, but forms trimers or more. It is an object of the present invention to provide an antibody exhibiting an agonistic activity against a receptor that exhibits the same.
- a triabody having a trivalent antigen-binding site by linking a heavy chain variable region (VH) and a light chain variable region (VL) of a single-chain Fv (scFv)
- VH heavy chain variable region
- VL light chain variable region
- scFv single-chain Fv
- TNF receptor family such as TNF receptor and Fas receptor, which also function in trimer or more and induce cell death. It is suggested that it may act as a signal and signal cell death.
- FIG. 1 shows the results of evaluating the cytotoxic activity of Diabody.
- mock was measured by introducing the empty vector PCXND3 into COS-7
- mock + M2 was measured by adding M2 antibody to mock
- KMTR1 db was measured by adding Diabody
- KMTR1 db + M2 indicates the result of adding the M2 antibody to KMTR1 db, respectively.
- FIG. 2 shows the results of evaluating the cytotoxic activity of Triabody and Whole IgG.
- ScFvH5L was measured on cells to which Diabody was added
- scFvH2L, SCFVH1L, and scFvHOL were obtained by adding Triabodies with linker lengths of 2 mer, 1 mer and 0 mer between VH-VL, respectively
- Whole IgG shows the results obtained by adding Whole IgG.
- FIG. 3 is a view showing the results of comparing the cytotoxic activities of Triabody and Tandem Diabody.
- scFvH2L, SCFVH1L, and scFvHO have a linker length between VH-VL of 2 mer, 1 mer, and 0 mer, respectively, and add 7-mer Triabody, and the results obtained by adding Tandem Diabody and Tandem Diabody are shown. Show.
- FIG. 4 is a diagram schematically showing a step of preparing a base sequence encoding the entire Diabody.
- FIG. 5 is a continuation of FIG. 4.
- TRAIL receptor It is not limited to an antibody against the TRAIL receptor, but includes antibodies against all trimeric or higher receptors.
- the present invention provides an antibody that recognizes a TNF-related apoptosis-inducing ligand receptor (TRAIL receptor).
- the antibody that recognizes the TRAIL receptor of the present invention is preferably one that can induce cell death (such as apoptosis) in cells expressing the TRAIL receptor.
- TRAIL receptors antibodies that recognize TRAIL-R1 or TRAIL-R2, which are known to be specifically expressed in tumor cells, are preferred among the antibodies of the present invention. Those that induce apoptosis in tumor cells in which any of the body is expressed are preferred.
- Cells in which the antibody of the present invention induces apoptosis are preferably tumor cells.
- the tumor cells are not particularly limited and include, for example, colon cancer, lung cancer, breast cancer, melanoma, colorectal cancer, brain tumor, renal cell cancer, bladder cancer, leukemia, lymphoma, T-cell lymphoma, and multiple myeloma , Spleen cancer, gastric cancer, cervical cancer, endometrial cancer, ovarian cancer, esophageal cancer, liver cancer, head and neck squamous cell carcinoma, skin cancer, urinary tract cancer, prostate cancer, choriocarcinoma, pharyngeal cancer, laryngeal cancer, today Meningioma, Male embryo, Endometrial hyperplasia, Endometriosis, Embryomas, Fibrosarcoma, Posi-sarcoma, Hemangiomas, Cavernous hemangiomas, Hemangioblastomas, Retinoblastomas, Astrocytomas, Nerves Fibroma, oligodendroma, medulloblast
- the “TRAIL receptor” is a receptor to which a TNF-related apoptosis-inducing ligand (TRAIL) binds, and may be any receptor as long as TRAIL binds.
- TRAIL TNF-related apoptosis-inducing ligand
- five types of receptors to which TRAIL binds are known: TRAIL-1 receptor, TRAIL-2 receptor, TRAIL-3 receptor, TRAIL-4 receptor and osteoprotegerin (OPG).
- the antibody of the present invention may recognize any TRAIL receptor, but is preferably an antibody that recognizes the TRAIL-1 receptor or the TRAIL-2 receptor.
- the sequence of each TRAIL receptor is known, and for example, a sequence registered in GenBank can be referred to.
- the anti-TRAIL receptor of the present invention preferably recognizes a polypeptide having the amino acid sequence of the human TRAIL receptor registered under the following GenBank Accession number: TRAIL-1 receptor (NP_003835), TRAIL -2 receptor (NP_003833), TRAIL-3 receptor (NP-003832), and TRAIL-4 receptor (NP-003831).
- antibody is used in the broadest sense, and as long as it exhibits a desired biological activity, a monoclonal antibody, polyclonal antibody, antibody variant (chimeric antibody, humanized antibody, minibodies (antibody) Fragments), multispecific antibodies, etc.).
- Preferred antibodies are low molecular weight antibodies such as monoclonal antibodies, chimeric antibodies, humanized antibodies, and antibody fragments.
- Monoclonal and polyclonal antibodies that recognize the TRAIL receptor of the present invention can be prepared by a known method using a natural TRAIL receptor as an antigen. Alternatively, it can be prepared using an antigenic polypeptide that has been genetically engineered based on the above-mentioned known TRAIL receptor sequence. Monoclonal antibodies are substantially homogeneous populations of antibodies that act specifically on a single antigenic determinant (epitope) on an antigen. From this point of view, they are preferred over polyclonal antibodies containing multiple types of antibodies showing specificity for different epitopes. The term "monoclonal antibody” refers to an antibody that only exhibits the properties of a substantially homogeneous population of antibodies and is It does not limit the manufacturing method, etc.
- a monoclonal antibody can be obtained, for example, by the following method.
- a TRAIL receptor protein or its antigenic peptide to be used as a sensitizing antigen for obtaining an antibody is obtained.
- a polynucleotide of a gene sequence encoding a TRAIL receptor is inserted into a known expression vector, and a suitable host cell is transformed with the expression vector.
- the target TRAIL receptor protein therein is purified by a known method.
- an antibody is produced by a known method using this purified TRAIL receptor protein or a partial peptide of the TRAIL receptor as a sensitizing antigen.
- the partial peptide can be obtained by chemical synthesis from the amino acid sequence of the TRAIL receptor.
- cells or viruses that express the TRAIL receptor on the cell surface can be used as the sensitizing antigen.
- the epitope on the TRAIL receptor molecule recognized by the anti-TRAIL receptor antibody of the present invention is not limited to a specific one, and may be any epitope on the TRAIL receptor molecule. Therefore, any fragment can be used as a sensitizing antigen for preparing the anti-TRAIL receptor antibody of the present invention, as long as it is a fragment containing epitope present on the TRAIL receptor molecule.
- the antigen for producing the antibody of the present invention may be a complete antigen having immunogenicity or an incomplete antigen (including hapten) having no immunogenicity.
- 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.
- rodent animals for example, mice, rats, wild, muster, or egrets, monkeys and the like are used.
- Immunization of an animal with a sensitizing antigen is performed according to a known method.
- a common method includes injecting a sensitizing antigen intraperitoneally or subcutaneously into a mammal. Specifically, after sensitizing antigen is diluted and suspended in an appropriate amount such as PBS (Phosphate-Buffered Saline) or physiological saline, an appropriate amount of a normal adjuvant, for example, Freund's complete adjuvant is mixed and emulsified, if desired, and then emulsified. Administer to mammals several times every 21 days.
- a suitable carrier can be used during immunization of the sensitizing antigen.
- immunized cells are collected from the mammal and subjected to cell fusion.
- preferred U cells include, in particular, spleen cells.
- mammalian myeloma cells are usually used as parent cells that fuse with immune cells.
- Various myeloma cell lines are known, for example, P3 (P3x63Ag8.653) (J. Immnol. (1979) 123: 1548-50), P3x63Ag8U.l (Curr.Topics Microbiol. Immunol.
- Cell fusion between the above-mentioned immune cells and myeloma cells is basically performed.
- the method can be carried out according to a known method, for example, the method of Kohler and Milstein, Methods Enzymol. (1981) 73: 3-46.
- cell fusion is performed in a normal nutrient culture solution in the presence of a cell fusion promoter.
- a cell fusion promoter for example, polyethylene glycol (PEG), Sendai virus (HVJ) and the like are used, and if necessary, an auxiliary agent such as dimethyl sulfoxide can be added to enhance the fusion efficiency.
- PEG polyethylene glycol
- HVJ Sendai virus
- an auxiliary agent such as dimethyl sulfoxide can be added to enhance the fusion efficiency.
- the ratio of immune cells to myeloma cells used can be set arbitrarily. For example, it is preferable that the number of immune cells be 110 to 10 times that of myeloma cells.
- Examples of the culture medium used for cell fusion include RPMI1640 culture medium suitable for myeloma cell line growth, MEM culture medium, and the like.In addition, culture medium commonly used for this type of cell culture can be used as appropriate. . Furthermore, a serum replacement solution such as fetal calf serum (FCS) may be added to the culture solution.
- FCS fetal calf serum
- Immune cells are mixed well with a given amount of myeloma cells in a culture solution, and a PEG solution (for example, having an average molecular weight of about 1000-6000) pre-warmed to about 37 ° C is usually prepared at 30-60% (w / v). Cell fusion is carried out by adding and mixing at a concentration to form a target fused cell (hybridoma).
- the formed hybridomas can be selected by culturing them in a normal selective culture solution, for example, a HAT culture solution (a culture solution containing hypoxanthine, aminopterin and thymidine). Cultivation in the above HAT medium is sufficient for the cells other than the target hybridoma (non-fused cells) to die. (Usually a few days and a few weeks). Then, by carrying out the usual limiting dilution method, screening of an antibody-producing hybridoma and single-cloning are carried out.
- a normal selective culture solution for example, a HAT culture solution (a culture solution containing hypoxanthine, aminopterin and thymidine). Cultivation in the above HAT medium is sufficient for the cells other than the target hybridoma (non-fused cells) to die. (Usually a few days and a few weeks).
- hybridoma instead of obtaining a hybridoma by immunizing a non-human animal with an antigen as described above, human lymphocytes are sensitized to TRAIL receptor in vitro, and the sensitized lymphocytes are permanently divided from humans.
- a hybridoma producing a desired human antibody having a binding activity to a TRAIL receptor can also be obtained by fusing with a myeloma cell having an ability (see Japanese Patent Publication No. 1-59878).
- a transgenic animal having the entire repertoire of human antibody genes is administered a TRAIL receptor as an antigen to obtain anti-TRAIL receptor antibody-producing cells, immortalized them, and a human antibody against the TRAIL receptor is obtained.
- the produced hybridoma may be obtained (see International Patent Application Publication Nos. WO 94/25585, WO 93/12227, WO 92/03918, and WO 94/02602).
- the hybridoma that produces 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 can be obtained by a conventional method in which the hybridoma is cultured, and a monoclonal antibody is obtained as a culture supernatant.
- a method in which a hybridoma is administered to a mammal compatible with the hybridoma and proliferated, and a monoclonal antibody is obtained from ascites of the animal can be employed.
- the former method is suitable for obtaining high-purity antibodies, and the latter method is suitable for mass production of antibodies.
- the antibody of the present invention can also be produced as a recombinant antibody by a gene recombination technique in which the antibody gene is hybridoma-cloned, the vector prepared by incorporating the antibody gene into an appropriate vector is introduced into a host.
- a gene recombination technique in which the antibody gene is hybridoma-cloned
- the vector prepared by incorporating the antibody gene into an appropriate vector is introduced into a host.
- mRNA encoding the variable (V) region of an anti-TRAIL receptor antibody is isolated from a hybridoma producing an anti-TRAIL receptor antibody.
- the mRNA can be isolated by a known method, for example, guanidine ultracentrifugation (Chirgwin et al., Biochemistry (1979) 18: 5294-9), total RNA is prepared by the AGPC method (Chomczynski et al, Anal. Biochem. (1987) 162: 156-9), etc., and the target mRNA is purified using the mRNA Purification Kit (Pharmacia). Can be prepared. Alternatively, only the mRNA can be directly prepared by using the QuickPrep mRNA Purification Kit (Pharmacia).
- cDNA of the antibody V region is synthesized from the obtained mRNA using reverse transcriptase.
- cDNA can be synthesized using AMV Reverse Transcriptase First-strand cDNA Synthesis Kit (manufactured by Seikagaku Corporation) or the like.
- the cDNA was synthesized and amplified using the 5'-Ampli FINDER RACE Kit (manufactured by Clontech), and 5'-13 ⁇ 45 method using PCR 1 "01 ⁇ 1 & et al., Proc. Natl. Acad. USA (1988) 85: 8998-9002; Belyavsky et al., Nucleic Acids Res. (1989) 17: 2919-32), etc.
- the target DNA is obtained from the obtained PCR product.
- the fragment is purified, a recombinant vector is prepared by ligating the fragment to the vector DNA, the recombinant vector is introduced into a host such as Escherichia coli, and a colony of the transformed cells is selected. If necessary, the nucleotide sequence of the target DNA is confirmed by a known method, for example, the dideoxynucleotide chain termination method, and the like.
- the DNA encoding the V region of the antibody to be encoded is the DNA encoding the desired antibody constant region (C region).
- the expression vector contains an expression control region, for example, an enhancer and a promoter, and the antibody DNA is incorporated into the expression vector so that the antibody of the present invention is expressed by controlling the region.
- host cells are transformed with this expression vector to express the antibody.
- Expression of the antibody gene may be performed by separately transforming the DNA encoding the antibody heavy chain (H chain) or the light chain (L chain) into an expression vector and co-transforming the host cell, or by transforming the H chain.
- the host cell may be transformed with a single expression vector into which DNA encoding the L chain is integrated (see WO 94/11523).
- the antibodies of the present invention also include antibodies that are functionally equivalent to the antibodies of the present invention and have high homology to the amino acid sequence of the antibodies.
- High homology usually means at least 50% or more identity, preferably 75% or more identity, more preferably 85% or more identity, and more preferably 95% or more identity at the amino acid level. Refers to gender.
- Polypeptide To determine the homology, an algorithm described in the literature (Wilbur and Lipman, Proc. Natl. Acad. Sci. USA (1983) 80: 726-30) can be used.
- Such an antibody functionally equivalent to the antibody of the present invention and having high homology was obtained by, for example, using a probe or primer prepared based on the sequence information of the DNA encoding the antibody of the present invention. It can be obtained by hybridization or gene amplification.
- the target sample for hybridization or gene amplification includes a cDNA library constructed from cells expected to express such an antibody.
- “functionally equivalent” means that the target antibody has the same biological or biochemical activity as the antibody of the present invention.
- Biological and biochemical activities of antibodies include, for example, binding activity and agonist activity. That is, by measuring the TRAIL receptor binding activity of the antibody or the TRAIL receptor-mediated apoptosis-inducing activity, whether or not the antibody is functionally equivalent to the antibody of the present invention can be examined.
- the activity of the antibody to induce apoptosis via the receptor is not limited to this, and can be measured, for example, according to the method described in “4. Evaluation of cytotoxic activity” in Examples.
- the antibodies of the present invention include those obtained by modifying the amino acid sequence of the antibody obtained as described above by amino acid substitution, deletion, caroylation and Z or insertion, or chimerization or humanization. It is. Amino acid substitutions, deletions, additions and / or insertions, and amino acid sequence modifications such as humanization and chimerization can be performed by methods known to those skilled in the art. Similarly, the variable region and constant region of the antibody used when producing the antibody of the present invention as a recombinant antibody may also have amino acids by substitution, deletion, addition and Z or insertion of amino acids, or by chimerization or humanization. The sequence may be modified.
- the antibody that recognizes the TRAIL receptor of the present invention is not limited by the origin and shape of any antibody as long as it has the ability to bind to the TRAIL receptor. Preferably, it specifically binds to More preferably,
- Antibodies of the present invention include mouse antibodies, human antibodies, rat antibodies, egret antibodies, goat antibodies, camel antibodies, etc. Antibodies derived from various animals may be used. Furthermore, for example, chimeric antibodies, especially modified antibodies in which amino acid sequences are substituted, such as humanized antibodies, may be used. In addition, any antibody such as a modified antibody, an antibody fragment, or a low molecular weight antibody to which various molecules are bound may be used.
- a “chimeric antibody” is an antibody produced by combining sequences from different animals.
- an antibody that has variable (V) regions of the heavy and light chains of a mouse antibody and constant (C) regions of the heavy and light chains of a human antibody can be exemplified.
- the production of chimeric antibodies is known.For example, a DNA encoding an antibody V region is ligated to a DNA encoding a human antibody C region, and this is inserted into an expression vector, introduced into a host, and produced.
- Antibody can be obtained
- humanized antibody refers to a complementarity determining region (CDR) of a non-human mammal-derived antibody such as a mouse antibody, also called a reshaped human antibody. It is a grafted antibody CDR. Methods for identifying CDRs are known (Kabat et al., Sequence of Proteins of Immunological Interest (1987), National
- the CDR of a mouse antibody is determined by a known method, and a DNA encoding an antibody in which the CDR is linked to a framework region (FR) of a human antibody is obtained. It can be produced by a system using an expression vector.
- Such DNA can be synthesized by a PCR method using as primers several oligonucleotides prepared so as to have overlapping portions in the terminal regions of both CDR and FR (W098 / 13388). See the method described in the gazette).
- the FRs of the human antibody linked via the CDR are selected such that the CDR forms a good antigen-binding site.
- the amino acids of FR in the variable region of the antibody may be modified so that the CDRs of the reshaped human antibody form an appropriate antigen-binding site (Sato et al,
- Amino acid residues in FR that can be modified include those that directly and non-covalently bind to antigen (Amit et al., Science (1986) 233: 747-53) and those that affect or act on the CDR structure (Chothia et al., J. Mol. Biol. (1987) 196: 901-17) and And a portion related to the VH-VL interaction (EP239400 patent publication).
- the C region of these antibodies is preferably derived from a human antibody.
- C ⁇ 1, C ⁇ 2, C ⁇ 3, and C ⁇ 4 can be used for the H chain, and C ⁇ and C ⁇ can be used for the L chain.
- the C region of the human antibody may be modified as necessary.
- the chimeric antibody of the present invention preferably comprises a variable region of an antibody derived from a mammal other than human and a constant region derived from a human antibody.
- the humanized antibody of the present invention also preferably has the CDRs of a non-human mammal-derived antibody and the FR and C regions derived from a human antibody.
- the variable region will be described collectively in (3) -3.
- the constant region derived from a human antibody has a unique amino acid sequence for each isotype such as IgG (IgGl, IgG2, IgG3, IgG4), IgM, IgA, IgD, and IgE.
- the constant region used in the humanized antibody of the present invention may be a constant region of an antibody belonging to any isotype.
- the force at which the constant region of the human HgG is used is not limited thereto.
- the FR derived from a human antibody used for the humanized antibody of the present invention is not particularly limited, and may be an antibody belonging to any isotype.
- variable regions and constant regions of the chimeric antibody and humanized antibody of the present invention may be modified by deletion, substitution, insertion and / or addition, etc., as long as they show the binding specificity of the original antibody.
- Chimeric antibodies and humanized antibodies that utilize human-derived sequences are considered to be useful when administered to humans for therapeutic purposes, etc. because of their reduced antigenicity in the human body.
- the antibody of the present invention is a low molecular weight antibody.
- the low-molecular-weight antibody is particularly preferable as the antibody of the present invention because it can be produced at low cost using Escherichia coli, plant cells, and the like, in terms of its pharmacokinetic properties.
- Antibody fragments are a type of low molecular weight antibody.
- the minibodies also include antibodies having an antibody fragment as a part of its structure.
- the structure and production method of the low molecular weight antibody of the present invention are not particularly limited as long as it has an antigen-binding ability.
- the minibodies of the present invention have higher activity than full-length antibodies.
- the “antibody fragment” is not particularly limited as long as it is a part of a whole antibody (for example, whole IgG). And preferably a heavy chain variable region (VH) or a light chain variable region (VL). Examples of preferable antibody fragments include Fab, F (ab '), Fab', and Fv.
- Antibodies include Fab, F (ab '), Fab', and Fv.
- VH or VL in the body fragment may be modified by substitution, deletion, addition and Z or insertion. Furthermore, VH and VL may be partially deleted as long as the antigen-binding ability is maintained.
- Fv is the minimum antibody fragment that contains a complete antigen recognition site and a binding site.
- Fv is a dimer in which one VH and one VL are tightly bound by a non-covalent bond (VH-VL dimer).
- the three complementarity determining regions (CDRs) of each variable region interact to form an antigen-binding site on the surface of the VH-VL dimer. Six CDRs confer antigen-binding sites on the antibody.
- variable region of the antibody fragment may be chimerized or humanized.
- minibodies include both VH and VL.
- minibodies include antibody fragments such as Fab, Fab ', F (ab') 2 and Fv, and scFv (single chain Fv) (Huston et al. Natl. Acad. Sci. USA (1988) 85: 5879-83; Plickthun "The Pharmacology of Monoclonal Antibodies” Vol. 113, eds. Resenburg and Moore, Springer Verlag, New York, pp. 269-315, (1994) )), Diabody (Holliger et al, Proc. Natl. Acad. Sci. USA (1993) 90: 6444-8;
- Antibody fragments can be obtained by treating an antibody with an enzyme, for example, a protease such as papain or pepsin (Morimoto et al., J. Biochem. Biophys. Methods (1992) 24: 107-17; Brennan et al., Science (1985) 229: 81). It can also be produced by genetic recombination based on the amino acid sequence of the antibody fragment.
- an enzyme for example, a protease such as papain or pepsin (Morimoto et al., J. Biochem. Biophys. Methods (1992) 24: 107-17; Brennan et al., Science (1985) 229: 81). It can also be produced by genetic recombination based on the amino acid sequence of the antibody fragment.
- a low molecular weight antibody having a structure in which an antibody fragment is modified can be constructed using an antibody fragment obtained by enzymatic treatment or gene recombination.
- a gene encoding the entire low molecular weight antibody can be constructed, introduced into an expression vector, and then expressed in an appropriate host cell (for example, Co et al., J. Immunol. (1994) 152: 2968-76; Better and Horwitz, Methods Enzymol. (1989) 178: 476-96; Pluckthun and Skerra, Methods Enzymol. (1989) 178: 497-515; Lamoyi, Methods Enzymol. (1986) 121: 652- 63; Rousseaux et al, Methods Enzymol. (1986) 121: 663-9; Bird and Walker, Trends Biotechnol. (1991) 9: 132-7).
- scFv which is an example of a low-molecular-weight antibody having a structure in which an antibody fragment is modified, is a single-chain polypeptide in which two variable regions are linked via a linker or the like as necessary.
- the two variable regions included in the scFv may be two VHs or two VLs, usually one VH and one VL.
- scFv polypeptides contain a linker between the VH and VL domains, thereby forming the VH and VL pairing moiety required for antigen binding.
- the linker connecting VH and VL is generally a peptide linker having a length of 10 amino acids or more.
- the scFv linker in the present invention is not limited to such peptide linkers as long as the scFv formation is not hindered.
- Diabody An antibody in which two molecules of scFv form a dimer by non-covalent bond is called Diabody.
- Diabody contains two scFv molecules, it contains four variable regions, and as a result, has two antigen-binding sites. Unlike the case of scFv, which does not form a dimer.In the case of the purpose of forming a diabody, usually, a linker connecting between VH and VL in each scFv molecule is around 5 amino acids when a peptide linker is used. Shall be However, the scFv linker that forms the Diabody in the present invention is not limited to such a peptide linker as long as it does not prevent the expression of scFv and does not prevent the formation of Diabody. Yes.
- “Sc (Fv) 2” is an antibody in which two scFvs and the like are linked to each other with a linker or the like to form a single-chain polypeptide, and includes four variable regions (Hudson et al, J. Immunol. Methods (1999) 231: 177-89) o sc (Fv) 2 shows a particularly high agonistic activity as compared to full-length antibodies or other minibodies. Usually, they are constructed so as to form two VH-VL pairs in the same molecule and two antigen binding sites. sc (Fv) 2 can be produced, for example, by linking scFv with a linker. sc (Fv) 2 usually has the following structure.
- any linker may be used as the linker.
- a peptide linker a synthetic compound linker (see Protein Engineering (1996) 9 (3): 299-305) and the like are preferable, but a peptide linker is preferably used.
- the length of the peptide linker is not particularly limited, and can be appropriately selected by those skilled in the art according to the purpose.
- the linker used for the low molecular weight antibody of the present invention will be described in detail in (3) -2-3 below.
- the variable region is not particularly limited, as long as it has two VHs and two VLs.
- variable regions (a) and (c) are VH
- variable regions (b) and (d) are VL
- variable regions (a) and (d) are VL
- variable regions (a) and (d) are short
- linker (B) is long enough so that (c) and (c) each pair to form two antigen-binding sites on the same peptide chain.
- One preferable embodiment of the antibody of the present invention is an antibody having three or more antigen-binding sites.
- the upper limit of the number of binding sites is not particularly limited, but is usually 30 or less (10 or less, 5 or less).
- Preferred antibodies in the present invention are those containing three or four antigen-binding sites.
- One antigen-binding site is usually composed of a pair of one heavy-chain variable region (VH) and one light-chain variable region (VL). Therefore, an antibody containing three antigen-binding sites usually contains three VHs and three VLs, and an antibody containing four antigen-binding sites contains four VHs and four VLs.
- the antibody of the present invention including three antigen-binding sites is not particularly limited by its shape, and may be any antibody as long as it includes three antigen-binding sites.
- the antibody having four antigen-binding sites of the present invention is not particularly limited by its shape or the like, and may be any antibody as long as the antibody has four antigen-binding sites.
- a preferred example is a dimer of two sc (Fv) 2 (Tandem Diabody) (Cancer Research (2000) 60: 4336-41).
- the scFv When forming a trimer of scFv, the scFv may be formed as a trimer by non-covalent bond or a trimer by covalent bond. Alternatively, a trimer may be formed by mixing both non-covalent bonds and covalent bonds in one molecule.
- the two variable regions may be linked via a linker or the like, or the two variable regions may be linked directly without a linker.
- Any linker can be used.
- the ability to use a peptide linker or a synthetic compound linker is preferable.
- a peptide linker is preferably used.
- the length of the peptide linker is not particularly limited, and can be appropriately selected by those skilled in the art according to the purpose. However, it is known that it is possible to form a triabody by reducing the length of the peptide linker to 112 amino acids (Journal of Immunological Methods (1999) 231: 177-89).
- the peptide linker between the variable regions is preferably 0 to 2 amino acids, particularly preferably 0 or 1 amino acid.
- a peptide linker of 0 amino acids indicates that the peptide linker is not via the peptide linker, and thus indicates that the two variable regions are directly linked.
- the triabody of the present invention When the triabody of the present invention is prepared, three scFvs may be combined with a linker or the like to form a single-chain polypeptide. In this case, six variable regions will be included in the single-chain polypeptide. In this case, it is preferable that the peptide linker between scFvs is a sufficiently long peptide linker.
- the purified polypeptide is separated by gel filtration chromatography, etc., and the peak of the purified polypeptide is detected at the position of the molecular weight corresponding to the trimer. Can be determined by In the present invention, examples of the carrier used for gel filtration chromatography include Superdex 200 and Superose 6.
- an antibody having three antigen-binding sites include, for example, three variable regions. And dimers of single-chain polypeptides.
- one single-chain polypeptide usually contains two heavy-chain variable regions (VH) and one light-chain variable region (VL), and the other single-chain polypeptide has two VLs. And one VH.
- one single-chain polypeptide may include three heavy chain variable regions (VH), and the other single-chain polypeptide may include three light chain variable regions.
- Sc (Fv) 2 is an antibody in which two scFvs and the like are linked to each other with a linker or the like to form a single-chain polypeptide, and includes four variable regions. Accordingly, Tandem Diabody, a dimer of sc (Fv) 2, contains eight variable regions. Sc (Fv) 2 that constitutes Tandem Diabody usually has the following structure.
- Tandem Diabody consists of (1) two sc (Fv) 2 containing two VH and two VL, (2) sc (Fv) 2 with four VH, and sc with four VL.
- the Tandem Diabody of the present invention includes all those Tandem Diabodies.
- Any linker may be used as a linker connecting the variable regions.
- a peptide linker, a synthetic compound linker, etc. may be used.
- a peptide linker is used.
- the length of the peptide linker is not particularly limited, and can be appropriately selected by those skilled in the art according to the purpose.
- linker (1) and linker (3) are short peptide linkers, for example, 0-10 amino acids, preferably 2-8 amino acids, and more preferably. Is a linker of 4-6 amino acids (for example, 5 amino acids).
- linker (2) is preferably a long peptide linker, for example, 10-30 amino acids, preferably 12-20 amino acids, More preferably, it is 14-16 amino acids (for example, 15 amino acids).
- two sc (Fv) 2s may be combined with a linker or the like to form a single-chain Tandem Diabody.
- the single-chain polypeptide contains eight variable regions.
- the antibody produced as described above is a tandem diabody or not can be determined by separating purified polypeptide by gel filtration chromatography or the like, and then purifying the purified polypeptide at the position of the molecular weight corresponding to the dimer. It can be determined by detecting the peptide peak.
- Superdex 200, Superose 6, or the like can be mentioned as a carrier used for gel filtration chromatography.
- antibodies containing four antigen-binding sites include, for example, scFv tetramers and the like. All of these antibodies include the antigen-binding site of the present invention in the four antibodies.
- the preferred examples of the antibody of the present invention have been described with respect to the case where the number of antigen-binding sites is four or four, but an antibody having five or more antigen-binding sites is prepared using the same principle. It is also possible.
- any linker may be used as the linker for the low molecular weight antibody.
- any peptide linker which can be introduced by genetic engineering, or a synthetic compound linker (for example, Protein Engineering (1996) 9 (3): 299-305).
- the length of the peptide linker that can be used in the present invention is not particularly limited, and can be appropriately selected by those skilled in the art according to the purpose.
- the peptide linker for scFV there are used 11 to 100 amino acids, preferably 5 to 30 amino acids, particularly preferably 12 to 18 amino acids (for example, 15 amino acids).
- Examples of the amino acid sequence constituting the peptide linker of the present invention include the following sequences:
- Synthetic chemical compound linkers that can be used in the antibody of the present invention include cross-linking agents generally used for cross-linking peptides, for example, N-hydroxysuccinimide (NHS) disk simidinylsulfonate.
- cross-linking agents generally used for cross-linking peptides, for example, N-hydroxysuccinimide (NHS) disk simidinylsulfonate.
- DSS bis (sulfosuccinimidyl) suberate (BS 3 ), dithiopis (succinimidyl propionate) (DSP), dithiopis (sulfosuccinimidyl propionate) ( DTSSP), ethylene glycol bis (succinimidyl succinate) (EGS), ethylene glycol bis (sulfosuccinimidyl succinate) (sulfo EGS), disuccinimidyl tartrate (DST), disulfosuccinimid Jil tartrate (sulfo DST), bis [2- (succinimidoxycarboxy-loxy) ethyl] sulfone (BSOCOES), bis [2- (sulfosuccinimidoxy) Carbo-Roxy) ethyl] sulfone (sulfo
- variable regions When four antibody variable regions are bound by a linker, usually, the same force as the three linkers may be used, or different linkers may be used. Further, in some cases, the variable regions may be connected to each other without using a linker.
- variable region of the anti-TRAIL receptor antibody that can be used for preparing the chimeric antibody, humanized antibody and low molecular weight antibody of the present invention can be obtained by a method known to those skilled in the art.
- the variable region of an already known antibody for example, the antibody described in WO02 / 94880
- an antibody can be prepared by a method known to those skilled in the art using the TRAIL receptor or a fragment thereof as an immunogen, and the variable region thereof can be used. It is also possible to decode the sequence of a variable region of a known antibody or an antibody obtained by a known method, and use the variable region prepared by genetic engineering techniques.
- the origin of the variable region and the CDR in the variable region is not particularly limited, and may be derived from any animal. For example, a sequence of a mouse antibody, a rat antibody, a rabbit antibody, a camel antibody and the like can be used.
- amino acids of the variable region may be modified.
- Amino acid modifications include amino acid substitutions, deletions, additions, and Z or insertions, and these amino acid modification operations can be performed by methods known to those skilled in the art. Specifically, site-directed mutagenesis (Hashimoto-Gotoh et al, Gene (1995) 152: 271-5; Zoller and Smith, Methods Enzymol. (1983) 100: 468-500; Kramer et al., Nucleic Acids Res. (1984) 12: 9441-56; Kramer and Fritz, Methods Enzymol. (1987) 154: 350-67; Kunkel, Proc. Natl. Acad. Sci. USA (1985) 82: 488-92; Kunkel, Methods such as Methods Enzymol. (1988) 85: 2763-6) can be used.
- amino acids When mutating an amino acid residue in an antibody, it is desirable to mutate the amino acid residue to another amino acid having the same property as the side chain of the original amino acid residue.
- classifying amino acids based on the properties of the amino acid side chains hydrophobic amino acids (A, I, L, M, F, P, W, Y, V), and hydrophilic amino acids (R, D, N, C, E, Q, G, H, K, S, T), an amino acid having an aliphatic side chain (G, A ⁇ V, L, I, P), an amino acid having a hydroxyl-containing side chain (S, ⁇ , ⁇ ), amino acids with side chains containing sulfur atoms (C, M), amino acids with side chains containing carboxylic acids and amides (D, N, E, Q), amino acids with side chains containing bases (R, K , ⁇ ), and amino acids having an aromatic-containing side chain (H, F, Y, W) (all brackets indicate one letter of amino acids).
- the present inventors have generally found that there is a difference between the antibody activity before and after antibody modification. That is, an antibody that does not have an agonistic activity before the modification may exhibit the agonistic activity due to the modification such as reduction in molecular weight.
- a modified antibody exhibiting agonist activity was prepared using the variable region of an antibody that originally did not have agonist activity but binds to the TRAIL receptor. You can.
- a low molecular weight antibody having any one of the following amino acid sequences can be mentioned.
- the antibody described in (3) is preferably an antibody having an amino acid sequence described in SEQ ID NO: 2, 4, or 6 (each of ScFvH2L, ScFvHIL, and ScFvHOL), or a multimer thereof. More preferably, it is a trimeric antibody (Triabody) having the amino acid sequence of SEQ ID NO: 2, 4, or 6.
- the antibody described in (4) is preferably an antibody having the amino acid sequence described in SEQ ID NO: 8 (an antibody encoded by PCXND3 / KMTR1 Tandab) or a multimer thereof, and more preferably described in SEQ ID NO: 8.
- the nucleotide sequence encoding ScFvH2L is represented by SEQ ID NO: 1
- the nucleotide sequence encoding ScFvHIL is represented by SEQ ID NO: 3
- the nucleotide sequence encoding ScFvHOL is a dimer (Tandem Diabody) of an antibody having the amino acid sequence of ScFvHOL.
- the base sequence encoding PCXND3 / KMTR1 Tandab is shown in SEQ ID NO: 7.
- the present invention also includes antibodies functionally equivalent to the antibodies having the above sequences.
- Such antibodies include, for example, mutants of these antibodies.
- amino acids in the variable region for example, FR portion
- Amino acid modification includes amino acid substitution, deletion, addition and Z or insertion, and these amino acid modification operations can be performed by methods known to those skilled in the art. Specifically, site-directed mutagenesis (Hashimoto-Gotoh et al, Gene (1995) 152: 271-5; Zoller and Smith, Methods Enzymol. (1983) 100: 468-500; Kramer et al., Nucleic Acids Res. (1984) 12:
- amino acids having properties equivalent to those of the side chain of the original amino acid residue For example, classifying amino acids based on the properties of amino acid side chains: hydrophobic amino acids (A, I, L, M, F, P, W, Y, V) and hydrophilic amino acids (R, D, N, C, E) , Q, G, H, K, S, T), an amino acid having an aliphatic side chain (G, A, V, L, I, P), an amino acid having a hydroxyl-containing side chain (S, T, ⁇ ), Amino acids with side chains containing sulfur atoms (C, M), amino acids with side chains containing carboxylic acids and amides (D, N, E, Q), amino acids with side chains containing bases (R, K, ⁇ ), aromatic It can be classified into amino acids having a group-containing side chain (H, F, Y, W).
- hydrophobic amino acids A, I, L, M, F, P, W, Y, V
- hydrophilic amino acids R,
- a polypeptide having an amino acid sequence modified by deletion, addition, and / or substitution by another amino acid in the amino acid sequence of a certain polypeptide It is already known that the active activity is maintained (Mark et al., Proc. Natl. Acad. Sci. USA (1984) 81: 5662-6; Zoller and Smith, Nucleic Acids Res. (1982) 10 : 6487-500; Wang et al "Science (1984) 224: 1431-3; Dalbadie-McFarland et al., Proc. Natl. Acad. Sci. USA (1982) 79: 6409-13).
- Antibodies in which a plurality of amino acid residues are added to the amino acid sequence of the antibodies of the present invention include fusion proteins in which these antibodies are fused with other polypeptides.
- the method for preparing a fusion protein is as follows: DNA encoding the antibody of the present invention and DNA encoding another peptide or protein are ligated so that their frames match, introduced into an expression vector, and expressed in a host. A method known to those skilled in the art can be used.
- peptides or proteins to be fused with the antibody of the present invention include, for example, FLAG (Hopp et al, Bio / Technology (1988) 6: 1204-10), and six His (histidine) residues. 6XHis, 10XHis, influenza agglutinin (HA), human c-myc fragment, VSV-GP fragment, pl8HIV fragment, T7-tag, HSV-tag, E-tag, SV40T antigen fragment, Known peptides such as lck tag, a-tubulin fragment, B-tag, and protein C fragment can be used.
- FLAG Hopp et al, Bio / Technology (1988) 6: 1204-10
- 6XHis 6XHis, 10XHis, influenza agglutinin (HA), human c-myc fragment, VSV-GP fragment, pl8HIV fragment, T7-tag, HSV-tag, E-tag, SV40T antigen fragment
- Known peptides such as lck
- proteins to be fused with the antibody of the present invention include, for example, GST (daltathione-S-transferase), HA (influenza agglutinin), immunoglobulin constant region, ⁇ -galatatosidase, ⁇ ( Maltose binding protein).
- a fusion protein can be prepared by fusing a commercially available DNA encoding the peptide or protein with a DNA encoding the antibody of the present invention, and expressing the fusion DNA prepared thereby. Since Triabodies and Tandem Diabodies having each of the above sequences have a Flag tag added thereto, they can be fused with other peptides or proteins except for the Flag tag portion.
- the TRAIL receptor functions as a trimer in vivo.
- a triabody having a trivalent antigen binding site and a linker of sc (Fv) 2, and a linker of sc (Fv) 2 are formed by using a 2, 1 or Omer linker between VH and VL of the single-chain Fv (scFv).
- scFv single-chain Fv
- TNF and Fas receptors which also function as trimers and induce cell death
- TNF receptor family it was thought to act as a small molecule antibody agonist having three or more antigen binding sites such as Triabody and Tandem Diabody, and to transmit cell death signals more efficiently.
- the present invention provides an antibody that includes three or more antigen-binding sites and induces apoptosis in cells.
- the antibody is preferably a low molecular weight antibody that contains three or more antigen binding sites and induces apoptosis in cells.
- an antibody having three antigen binding sites such as Triabody, is preferred.
- an antibody having four antigen-binding sites such as Tandem Diabody.
- Cells in which the antibody of the present invention induces apoptosis are preferably tumor cells.
- the tumor cells are not particularly limited, and include, for example, colorectal cancer, lung cancer, breast cancer, melanoma, colorectal cancer, brain tumor, renal cell cancer, bladder cancer, leukemia, lymphoma, T-cell lymphoma, multiple myeloma, spleen cancer, Stomach cancer, cervical cancer, endometrial cancer, ovarian cancer, esophageal cancer, liver cancer, head and neck squamous cell carcinoma, skin cancer, urinary tract cancer, prostate cancer, choriocarcinoma, pharyngeal cancer, laryngeal cancer, capsuloma, Male germinoma, endometrial hyperplasia, endometriosis, germinoma, fibrosarcoma, positiosarcoma, hemangiomas, marine cavernomas, hemangioblastoma,
- a polynucleotide encoding the antibody of the above 1. and 2.
- the polynucleotide of the present invention is not particularly limited as long as it encodes the antibody of the present invention, and is a polymer having bases or base pairs, such as a plurality of deoxyribonucleic acids (DNA) or ribonucleic acids (RNA). It may contain a non-natural base.
- the polynucleotide of the present invention can be used when expressing antibodies by genetic engineering techniques. Further, it can be used as a probe when screening an antibody having a function equivalent to the antibody of the present invention. That is, a polynucleic acid encoding the antibody of the present invention. Using leotide or a part thereof as a probe, it hybridizes with the polynucleotide under stringent conditions by a technique such as hybridization and gene amplification technique (e.g., PCR), and binds to the antibody of the present invention. DNA encoding an antibody having equivalent activity can be obtained. Such DNA is also included in the polynucleotide of the present invention.
- a technique such as hybridization and gene amplification technique (e.g., PCR)
- Hybridization technology (Sambrook et al., Molecular Cloning 2nd ed. (1989) 9.47-9.58, Cold Spring Harbor Lab. Press) is a well-known technology to those skilled in the art.
- Hybridization conditions include, for example, low stringency. Under low stringent conditions, washing after hybridization may be performed, for example, at 42 ° C, 0.1 X SSC, 0.1% SDS, preferably at 50 ° C, 0.1 X SSC, 0.1%. Higher stringency conditions are more preferable conditions for the hybridization, such as 65 ° C., 5 ⁇ SSC, and 0.1% SDS.
- An antibody functionally equivalent to the antibody of the present invention which is encoded by the DNA obtained by the hybridization technique or the gene amplification technique, usually has a higher amino acid sequence than the antibody of the present invention. , Have homology.
- the present invention further provides a vector comprising the polynucleotide of the above 3.
- the vector of the present invention is not particularly limited as long as it incorporates the polynucleotide of the present invention.
- Escherichia coli when Escherichia coli is used as a host, the vector is amplified in Escherichia coli (for example, JM109, DH5a, HB101, XLlBlue) or the like in large amounts, and the “ori” to be amplified in Escherichia coli is prepared.
- it may have a gene that allows selection in transformed E.
- coli eg, a drug resistance gene that allows discrimination with any drug (ampicillin, tetracycline, kanamycin, chloramuecole, etc.)
- examples of such vectors include the M13 vector 1.
- pGEM-T, pDIRECT, pT7 and the like can be mentioned.
- an expression vector is particularly useful.
- a promoter capable of efficiently expressing the antibody in addition to the above-mentioned configuration enabling the amplification of the vector.
- the host is Escherichia coli such as JM109, DH5a, HB101, and XL1-Blue
- the lacZ promoter Ward et al, Nature (1989) 341: 544-6; FASEB J. (1992) 6: 2422- 7
- the araB promoter Better et al., Science (1988) 240: 1041-3
- Such vectors include pGEX-5X-1 (manufactured by Pharmacia), “QIAexpress system” (manufactured by Qiagen), pEGFP, or pET (in this case, the host is BL21 expressing T7 RNA polymerase). Is preferred).
- the vector contains a signal sequence for polypeptide secretion!
- a signal sequence for protein secretion a pelB signal sequence (Lei et al., J. Bacteriol. (1987) 169: 4379) may be used in the case of production by E. coli periplasm.
- the introduction of the vector into the host cell can be performed using, for example, the Shii-Dani calcium method or the electroporation method.
- the vectors of the present invention include mammalian-derived expression vectors (pcDNA3 (Invitrogen), pEGF-BOS (Nucleic Acids. Res. (1990) 18 (17): 5322), pEF, pCDM8, etc.), insects Expression vectors derived from cells (“Bac-to-BAC baculovairus expression system” (GIBCO BRL), pBacPAK8, etc.), plant-derived expression vectors ( ⁇ 1, pMH2, etc.), and animal virus-derived expression vectors (pHSV, pMV, pAdexLcw, etc.), retrovirus-derived expression vectors (pZIPneo, etc.), yeast-derived expression vectors ("Pichia Expression KitJ (manufactured by Invitrogen), pNVll, SP-Q01, etc.), and Bacillus subtilis-derived expression vectors (pPL608, pKTH50) can also be used.
- mammalian-derived expression vectors pcDNA3
- SV40 promoter Mulligan et al, Nature (1979) 277: 108
- MMLVLTR promoter EF1 ⁇ promoter
- CMV promoter CMV promoter
- it is more preferable to have a gene for example, a drug resistance gene that can be determined by a drug (neomycin, G418, etc.) for determining whether or not the cell has been transformed with the vector.
- a gene for example, a drug resistance gene that can be determined by a drug (neomycin, G418, etc.)
- pOPRSV pOP13.
- the CHO cell lacking a nucleic acid synthesis pathway is supplemented with the defect.
- the vector can be amplified by introducing a vector (such as pCHOI) having a dihydrofolate reductase (DHFR) gene and incubating in the presence of methotrexate (MTX), which inhibits DHFR competitively.
- a vector such as pCHOI
- DHFR dihydrofolate reductase
- MTX methotrexate
- COS cells having a gene expressing the SV40 T antigen on the chromosome are transformed with a vector having a replication origin of SV40 (such as pcD).
- the expression vector is used as a selectable marker for aminoglycoside transferase (APH) gene, thymidine kinase (TK) gene, Escherichia coli xanthinguanine phosphoribosyltransferase (Ecogpt) gene, and dihydrofolate reduction for amplification of gene copy number in the host cell system.
- APH aminoglycoside transferase
- TK thymidine kinase
- dihydrofolate reduction for amplification of gene copy number in the host cell system.
- a host cell carrying the polynucleotide of the above item 3 or the vector of the above item 4.
- the host cell is not particularly limited, and examples thereof include Escherichia coli and various animal cells.
- the host cell can be used, for example, as a production system for producing and expressing the antibody of the present invention.
- Production systems for polypeptide 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.
- Eukaryotic cells that can be used as host cells include, for example, animal cells, plant cells, and fungal cells. Vesicles. Animal cells include mammalian cells, for example, amphibian cells such as CH0 (J. Exp. Med. (1995) 108: 945), COS-3T3, myeloma, BHK (baby hamster kidney), HeLa, Vero, etc. Examples include Megafrog oocytes (Valle et al., Nature (1981) 291: 338-340), and insect cells such as S19, S121, and Tn5. For expression of the antibody of the present invention, CHO-DG44, CHO-DX11B, COS7 cells, and BHK cells are preferably used.
- CHO cells are particularly preferred for large-scale expression in animal cells.
- the vector can be introduced into a host cell by, for example, a calcium phosphate method, a DEAE dextran method, a method using cationic ribosome DOTAP (manufactured by Boehringer Mannheim), an electoral poration method, a Lipofexion method, or the like. .
- strigomyces Aspertiana tabacum, cells derived from Nicotiana tabacum (Nicotiana tabacum) are known as a protein production system, and the antibody of the present invention can be produced by a method of callus culture of these cells.
- fungal cells include yeasts, for example, Saccharomyces (Saccharomyces) stable fermented spores, Saccharomyces cerevisiae, Saccharomyces pombe, and filamentous fungi, such as Aspergillus cells.
- yeasts for example, Saccharomyces (Saccharomyces) stable fermented spores, Saccharomyces cerevisiae, Saccharomyces pombe, and filamentous fungi, such as Aspergillus cells.
- Protein expression systems using Aspergillus niger Asspergillus niger, etc.
- prokaryotic cells When prokaryotic cells are used, there is a production system using bacterial cells.
- bacterial cells a production system using Bacillus subtilis in addition to the above-mentioned Escherichia coli (E. coli) is known and can be used for the production of the antibodies of the present invention.
- the host cell transformed with an expression vector containing the polynucleotide encoding the antibody of the present invention is cultured, and the polynucleotide is expressed.
- the culturing can be performed according to a known method. For example, when an animal cell is used as a host, for example, DMEM, MEM, RPMI1640, or IMDM can be used as a culture solution. At this time, the cells may be cultured using serum replacement fluid such as FBS or fetal calf serum (FCS) or serum-free culture.
- the pH during the culturing is preferably about 6-8. Culture is usually performed at about 30-40 ° C for about 15-200 hours, and the medium is replaced, aerated, and agitated as necessary.
- a system for producing a polypeptide in vivo includes, for example, production using an animal. And production systems using plants and plants. A polynucleotide of interest is introduced into these animals or plants, and the polypeptide is produced in the body of the animals or plants and collected.
- the “host” in the present invention includes these animals and plants.
- mammals When using animals, there are production systems using mammals and insects. As mammals, goats, pigs, sheep, mice, mice, etc. can be used (Vicki Glaser,
- a polynucleotide encoding the antibody of the present invention is prepared as a fusion gene with a gene encoding a polypeptide uniquely produced in milk, such as goat j8 casein.
- the polynucleotide fragment containing the fusion gene is injected into a goat embryo, and the embryo is transplanted into a female goat.
- the desired antibody can be obtained from the milk produced by the transgenic goat born from the goat that has received the embryo or its offspring.
- Hormones may be appropriately administered to transgenic goats to increase the amount of milk containing antibodies produced by the transgenic goats (Ebert et al., Bio / Technology (1994) 12: 699-702). .
- silkworms As an insect that produces the antibody of the present invention, for example, silkworms can be used.
- the target antibody can be obtained from the body fluid of the silkworm by infecting the silkworm with baculovirus into which the polynucleotide encoding the antibody of interest has been inserted (Susumu et al "Nature (1985) 315 : 592-4).
- the antibody thus obtained can be isolated from the inside or outside of a host cell (such as a medium or milk) and purified as a substantially pure and homogeneous antibody.
- Antibody separation and purification can be performed by using the separation and purification methods used in normal polypeptide purification. However, it is not limited. For example, chromatography columns, filters, ultrafiltration, salting out, solvent precipitation, solvent extraction, distillation, immunoprecipitation, SDS-polyacrylamide gel electrophoresis, isoelectric focusing, dialysis, recrystallization, etc.
- the antibodies can be separated and purified in combination.
- chromatography examples include affinity chromatography, ion exchange chromatography, hydrophobic chromatography, gel filtration, reverse phase chromatography, adsorption chromatography, and the like (Strategies for Protein Purification and
- chromatographys can be performed using liquid phase chromatography, for example, liquid phase chromatography such as HPLC and FPLC.
- liquid phase chromatography such as HPLC and FPLC.
- Columns used for affinity chromatography include protein A columns and protein G columns.
- columns using Protein A include Hyper D, POROS, Sepharose F.F. (Pharmacia) and the like.
- the protein can be arbitrarily modified or partially removed by reacting an appropriate protein modifying enzyme before or after purification of the antibody.
- an appropriate protein modifying enzyme for example, trypsin, chymotrypsin, lysyl endopeptidase, protein kinase, dalcosidase and the like are used.
- the antibodies disclosed in the present invention (for example, low molecular weight antibodies and antibodies having three or more antigen binding sites) recognize not only the TRAIL receptor but also other three It may be a body or larger receptor. Therefore, the present invention includes not only anti-TRAIL receptor antibodies but also antibodies against other trimeric or higher receptors.
- the other trimeric or higher receptor is not particularly limited, and may be any receptor, for example, TNF Family receptor.
- TNF Family receptors include p55-R, CD120a, TNF—R—I p55, TNF—R, TNFR1, TNFAR, TNF—R55, p55TNFR, TNFR60, CD120b, p75, TNF—R, TNF—R— ⁇ , TNFR80, TNFR2.TNF-R75, TNFBR, p75TNFR, TNFRSF3, TNFR2-RP, CD18, TNFR-RP, TNFCR, TNF— R— —, ⁇ 40, ACT35, TXGPlL, p50, Bp50, CD40.FAS, CD95, APO— 1, APTl, DcR3, M68, TR6, HGNC: 15888, NHL, DKFZP434C013, KIAA1088, bK3184A7.3, C20orf41, Tp55, S
- the present invention includes an antibody against a trimeric or higher receptor such as a TNF Family receptor.
- Antibodies to trimeric or higher receptors other than the TRAIL receptor can be used as low molecular weight antibodies or antibodies having three or more antigen binding sites (eg, Triabody and Tandem Diabody). It is preferable that
- These receptors are not particularly limited as long as they are at least trimers, and examples thereof include tetramers, pentamers, hexamers, and heptamers. And particularly preferably a trimer.
- the present invention provides a pharmaceutical composition comprising the antibody described in 1 or 2 above.
- the antibody is an antibody that induces apoptosis in cells (for example, when it is an anti-TRAIL receptor antibody)
- a pharmaceutical composition containing the antibody is particularly useful as an anticancer agent.
- the TNF Family receptor is involved in inflammatory diseases (TNFR) such as Crohn's disease and Behcet's disease, and autoimmune diseases such as rheumatoid arthritis (TNFR) and systemic lupus erythematosus (BAFFR).
- TNFR inflammatory diseases
- BAFFR systemic lupus erythematosus
- the antibody is an anti-TNF family receptor antibody
- a pharmaceutical composition containing the antibody is useful for treatment and prevention of inflammatory diseases and autoimmune diseases. It is.
- the antibody of the present invention when used in a pharmaceutical composition, it can be formulated by a method known to those skilled in the art.
- sterile with water or other pharmaceutically acceptable liquids It can be used parenterally in the form of injectable solutions or suspensions.
- pharmacologically acceptable carriers or vehicles specifically, sterile water or physiological saline, vegetable oils, emulsifiers, suspending agents, surfactants, stabilizers, flavoring agents, excipients, vehicles, preservatives It is possible to formulate the compound by combining it with an appropriate agent, binder and the like in a unit dose form required for generally accepted pharmaceutical practice. The amount of the active ingredient in these preparations is set so that an appropriate dose in the specified range can be obtained.
- a sterile composition for injection can be formulated using a vehicle such as distilled water for injection, according to a normal formulation practice.
- Aqueous solutions for injection include, for example, saline, isotonic solutions containing glucose and other adjuvants (eg, D-sorbitol, D-mannose, D-mantol, sodium chloride).
- Appropriate solubilizing agents for example, alcohols (eg, ethanol), polyalcohols (eg, propylene glycol, polyethylene glycol), and nonionic surfactants (eg, Polysorbate 80 (TM), HCO-50) may be used in combination.
- the oily liquid includes sesame oil and soybean oil, and benzyl benzoate and Z or benzyl alcohol may be used in combination as a solubilizing agent.
- a buffer eg, phosphate buffer and sodium acetate buffer
- a soothing agent eg, proforce hydrochloride
- a stabilizer eg, benzyl alcohol and phenol
- the pharmaceutical composition of the present invention is preferably administered by parenteral administration.
- the composition can be an injection, nasal, pulmonary, or transdermal composition.
- it can be administered systemically or locally by intravenous injection, intramuscular injection, intraperitoneal injection, subcutaneous injection and the like.
- the administration method can be appropriately selected depending on the age and symptoms of the patient.
- the dose of the antibody or the pharmaceutical composition containing the polynucleotide encoding the antibody can be set, for example, in the range of 0.1 mg / kg to 100 mg / kg body weight at a time. Or, for example, the strength can be as low as 0.001-100 mg per patient.
- the present invention is not necessarily limited to these values.
- the dosage and method of administration vary depending on the patient's weight, age, symptoms, etc., and those skilled in the art will consider appropriate The dosage and method of administration can be set.
- the antibody of the present invention can be formulated in combination with other pharmaceutical ingredients.
- a plurality of antibodies against TRAIL receptor can be combined into a pharmaceutical composition.
- an anti-TRAIL-R2 antibody whose antitumor activity is amplified by a combination of chemotherapy and Z or radiation therapy, is known! / (Buchsbaum et al, Clin. Cancer Res. (2003) 9: 3731-41), treatment with a pharmaceutical composition comprising the antibody of the present invention may also be performed in combination with chemotherapy and radiation therapy.
- Pharmaceutical ingredients used in chemotherapy include, for example, doxorubicin hydrochloride preparations, paclitaxel and the like.
- Pharmaceutical components used in combination with the antibody of the present invention can be combined into a single pharmaceutical product as long as the activities of the antibody and the pharmaceutical component are not inhibited and the components are administered by the same administration route. It is.
- the present invention relates to a method for inducing cell death of a cell by using the antibody of the present invention. Specifically, the present invention relates to a method for inducing cell death in a cell by bringing the antibody of the present invention into contact with the cell.
- a KMTR1 antibody whose variable region sequence was determined based on the nucleotide sequence described in Patent (WO 02/094880 A1) was produced.
- WO 02/094880 A1 a sequence from the 81st adenine (A) to the 497th adenine (A) in WO 02/094880 A1 was used as the heavy chain variable region. This includes the heavy chain signal sequence.
- the sequence from guanine (G) at position 123 to adenine (A) at position 443 in WO 02/094880 A1 was adopted. This is the mature sequence without the signal sequence.
- the gene fragment encoding the antibody fragment was designed as follows. Expression vector
- VL light chain variable region
- Asp-Tyr-Lys-Asp-Asp-Asp-Asp-LysZ SEQ ID NO: 12 Is attached.
- the nucleotide sequence encoding Flag is 5′-GAC TAC AAG GAT GAC GAC GAT AAG -3 ′ (SEQ ID NO: 11).
- the stop codon is ligated twice, and a Notl recognition sequence is added at the end.
- the nucleotide sequence encoding the designed Diabody is shown in SEQ ID NO: 13.
- DNA was designed. These are the sense and antisense sequences, ranging in length from 79 to 103 bases. It also contains sequences that are complementary to each other that are necessary for ligation by assembly. FIGS. 4 and 5 schematically show this process.
- the base sequences of the synthetic oligo DNAs are shown in SEQ ID NOs: 14 to 25. These SEQ ID numbers correspond to the names of the oligo DNAs used in the following reactions, as follows:
- the first stage assembly performed the reaction in the following six tubes:
- Tube A synthetic DNA S1 and AS1,
- Tube B Synthetic DNA S2 and AS2,
- Tube C Synthetic DNA S3 and AS3,
- Tube D Synthetic DNA S4 and AS4,
- Tube E synthetic DNA S5 and AS5, and
- Tube F synthetic DNA S6 and AS6.
- Tube 1 reaction products of tubes A and B,
- Tube 2 reaction products of tubes B and C,
- Tube 3 Reaction products of tubes D and E, and
- Tube 4 Reaction products of tubes E and F.
- Tube 1 + 2 Reaction products of tubes 1 and 2
- Tube 3 + 4 Reaction products of tubes 3 and 4. Mix 20 L of each reaction product in each tube, denature in a thermal cycler at 94 ° C for 1 minute, and then perform 5 cycles of 94 ° C, 30 seconds; 72 ° C, 30 seconds went.
- the first tube contains 1 ⁇ L of the reaction product of tube 1 + 2, 40 pmol of each of the external primers KMTRl HI (SEQ ID NO: 26) and KMTRl H2 (SEQ ID NO: 27), dATP, dGTP, dNTP mix, IX TaKaRa pyrobset TM DNA Polymerase buffer containing 250 ⁇ each of dTTP and dCTP, and 2.5 units of TaKaRa pyrobset TM DNA
- tube L Includes 50 ⁇ L reaction solution containing Polymerase.
- tube L 1 ⁇ L of the reaction product of tube 3 + 4, 40 pmol of each of the external primers KMTRl L1 (SEQ ID NO: 28) and KMTRl L2 (SEQ ID NO: 29), dATP, Includes dNTP mix, IX TaKaRa pyrobset TM DNA Polymerase buffer containing 250 ⁇ each of dGTP, dTTP, and dCTP, and 50 ⁇ L of reaction solution containing 2.5 units of TaKaRa pyrobset TM DNA Polymerase.
- the tubes H and L were subjected to denaturation at 94 ° C for 1 minute in a thermal cycler, 30 cycles of 94 ° C, 30 seconds; 72 ° C, 30 seconds were performed.
- tube K-2 40 ⁇ mol of the external primers KMTRl HI (SEQ ID NO: 26) and KMTRl L2 (SEQ ID NO: 29), dATP, dGTP, dTTP, were added to 1 ⁇ L of the reaction product obtained in tube K.
- a 50 L reaction solution containing a DNA Polymerase buffer and 5 units of TaKaRa pyrobset DNA Polymerase was prepared. This was transformed in a thermal cycler at 94 ° C for 1 minute, and then 30 cycles of 94 ° C, 30 seconds; 72 ° C, 60 seconds were performed. The reaction products were separated by 1.2% agarose gel electrophoresis, and the desired 800 bp fragment was cut from the gel. And purified using the QIAquick Gel Extraction Kit (QIAGEN). Next, the fragment was digested with restriction enzymes EcoRI and Notl, and then purified using QIAquick Nucleotide Removal Kit (QIAGEN). Expression vector obtained by pre-cleaving the fragment thus obtained with restriction enzymes EcoRI and Notl
- the diabody expression vector pCXND3 / KMTRl # 33 was hybridized to the vector so as to sandwich the region containing the linker portion (Gly-Gly-Gly-Gly-SerZ SEQ ID NO: 10) and amplified using these primers.
- Primers ScFv-2S (SEQ ID NO: 30) and ScFv-2A (SEQ ID NO: 31) were designed such that the linker in the fragment was a 2-mer of Gly-Gly.
- PCR was performed using pCXND3 / KMTRl # 33 as type III, a combination of KMTR1HI (SEQ ID NO: 26) and ScFv-2A, and a combination of ScFv-2S and KMTR1 L2 (SEQ ID NO: 29)
- the resulting two fragments are designed to have an overlap of 18 bases so that they can be assembled by complementarity with each other.
- tube 2-1 50 pmol of each primer KMTR1 HI and ScFv2A was added to the next reaction solution (hereinafter referred to as 1-2., 1-3-2. And 1-4-2. DNTP mix, lX TaKaRa pyrobset TM DNA Polymerase buffer containing 100 ng of pCXND3 / KMTRl # 33, dATP, dGTP, dTTP, dCTP each as 250 ⁇ ⁇ , and 5 units of TaKaRa pyrobset TM Reaction solution in a final volume of 50 ⁇ L containing DNA Polymerase.
- tube 2-2 50 pmol of each primer ScFv2S and KMTR1 L2 were added to the PCR reaction solution to prepare a total volume of 50 L. PCR was performed on the reaction solution in tube 2-2 in the same manner as in tube 2-1 to purify a fragment of the target size of 400 bp.
- the DNA fragments obtained from tubes 2-1 and 2-2 were added to the following reaction solution (referred to as assembly solution in the following 1-2.) In 1 ⁇ L portions: dATP, dGTP, dTTP DNTP mix containing 250 ⁇ l each of dCTP, lX TaKaRa pyrobset TM DNA Polymerase buffer, and a final volume of 50 ⁇ L containing 5 units of TaKaRa pyrobset TM DNA Polymerase.
- the tube 2 containing this solution was denatured in a thermal cycler at 94 ° C for 1 minute, and assembled by performing 5 cycles of 94 ° C, 30 seconds; 72 ° C, 60 seconds.
- reaction solution add 0.5 ⁇ L of each 100 ⁇ L of KMTR1 HI and KMTR1 L2, and 94. After denaturation with C for 1 minute, amplification was performed by 30 cycles consisting of 94 ° C, 60 seconds; 72 ° C, 60 seconds.
- the reaction products were separated by 1.2% agarose gel electrophoresis, the desired 800 bp fragment was excised from the gel, and purified using QIAquick Gel Extraction Kit (QIAGEN). The purified fragment was digested with restriction enzymes EcoRI and Notl, inserted into an expression vector PCXND3 that had been cleaved with restriction enzymes EcoRI and Notl, and the nucleotide sequence of the fragment was determined.
- a plasmid having the desired sequence was named pCXND3 / KMTR1ScFv2.
- Primers ScFv-lS (SEQ ID NO: 32) and ScFv-lA (SEQ ID NO: 33) were combined with the linker portion (Gly-Gly-Gly-Gly-Gly-SerZ SEQ ID NO: 10) of Diabody expression vector pCXND3 / KMTRl # 33.
- the primers were designed to hybridize so as to sandwich the containing region and to have a partial linker strength SGly of the fragment amplified using these primers.
- pCXND3 / KMTRl # 33 as type III, PCR was performed using KMTR1 HI (SEQ ID NO: 26) and ScFv-lA, and ScFv-lS and KMTR1 L2 (SEQ ID NO: 29). Fragments obtained by going
- the primers were designed to have an 18 base overlap that would allow for assembly by different complementations.
- tube 1-1 50 pmol of each primer KMTRl HI and ScFvlA was added to the PCR reaction solution, and denatured at 94 ° C for 1 minute in a thermal cycler. Seconds: 30 cycles of 60 seconds at 72 ° C were performed. The reaction products were separated by 1.2% agarose gel electrophoresis, the desired 400 bp fragment was excised from the gel, and purified using the QIAquick Gel Extraction Kit (QIAGEN).
- tube 1-2 50 pmol of each primer ScFvlS and KMTRl L2 were added to the PCR reaction solution to prepare a total volume of 50 L. Similarly to tube 1-1, PCR was performed on tube 1-2, and a fragment of the target size of 400 bp was purified.
- the amplified DNA fragments obtained from the respective reaction products in tube 1-1 and tube 1-2 were assembled and amplified as follows:
- the DNA fragment obtained from tube 1-1 and tube 1-2 was 1 ⁇ m.
- Each L was added to the assembling solution.
- Tube 1 containing this mixed reaction solution was subjected to denaturation at 94 ° C for 1 minute in a thermal cycler, and then assembled by performing 5 cycles of 94 ° C, 30 seconds; 72 ° C, 60 seconds. .
- To this tube add 0.5 ⁇ l each of 100 ⁇ M MOKMTR1 HI and KMTRl L2, perform denaturation at 94 ° C for 1 minute, followed by a cycle consisting of 94 ° C for 60 seconds; 72 ° C for 60 seconds.
- reaction products were separated by 1.2% agarose gel electrophoresis, the desired 800 bp fragment was excised from the gel, and purified using the QIAquick Gel Extraction Kit (QIAGEN).
- the purified fragment was digested with the restriction enzymes EcoRI and Notl, inserted into the expression vector PCXND3 that had been cleaved with the restriction enzymes EcoRI and Notl, and the nucleotide sequence of the fragment was determined.
- the plasmid having the desired sequence was named pCXND3 / KMTR1ScFvl.
- Primers ScFv-0S (SEQ ID NO: 34) and ScFv-0A (SEQ ID NO: 35) were combined with the linker portion (Gly-Gly-Gly-Gly-Gly-SerZ SEQ ID NO: 10) of Diabody expression vector pCXND3 / KMTRl # 33.
- the primers were designed so as to hybridize so as to sandwich the containing region, and that the fragments amplified using these primers did not contain a linker.
- KMTRl HI SEQ ID NO: 26
- reaction products were separated by 1.2% agarose gel electrophoresis, the desired 400 bp fragment was excised from the gel, and QlAquick Gel Extraction was performed.
- tube 0-2 50 pmol of each primer ScFvOS and KMTR1 L2 were added to the PCR reaction solution to prepare a total volume of 50 L. Similarly to tube 0-1, PCR was performed on tube 0-2 to purify a fragment of the target size of 400 bp.
- the DNA fragments obtained from 0-1 and the tube 0-2 were added in 1 ⁇ L portions. After denaturing the mixed reaction solution at 94 ° C for 1 minute in a thermal cycler, assembly was performed by 5 cycles of 94 ° C, 30 seconds; 72 ° C, 60 seconds. To this, add 0.5 ⁇ L of 100 M KMTRl HI and KMTRl L2, denature at 94 ° C for 1 minute, and then perform 30 cycles of 94 ° C, 60 seconds; 72 ° C, 60 seconds power! Amplification was performed. The reaction products were separated by 1.2% agarose gel electrophoresis, the desired 800 bp fragment was excised from the gel, and purified using the QlAquick Gel Extraction Kit (QIAGEN).
- the purified fragment was digested with restriction enzymes EcoRI and Notl, inserted into an expression vector pCXND3 previously cleaved with restriction enzymes EcoRI and Notl, and the nucleotide sequence of the fragment was determined.
- the plasmid having the desired sequence was named pCXND3 / KMTR1ScFvO.
- sc (Fv) 2 was designed in which three linkers between the variable regions of sc (Fv) 2 were composed of 5mer, 12mer and 5mer in this order.
- the 12-mer linker sequence the SL sequence described in the above report (Arg-Ala-Asp-Ala-Ala-Ala-Ala-Gly-Gly-Pro-Gly-SerZ SEQ ID NO: 36 ) And Gly-Gly-Gly-Gly-Ser (SEQ ID NO: 10) was used as a 5-mer linker.
- the amino acid sequence encoded by the constructed vector is (VH signal sequence)-(VH)-(5 mer linker)-(VL)-(12 mer linker)-(VH)-(5 mer linker) Car)-(VL)-(Flag tag)-(stop codon).
- DNA fragment encoding sc (Fv) 2 was obtained by PCR using the Diabody expression vector pCXND3 / KMTRl # 33 prepared in 1-1. As type III. By PCR, DNA fragment fragment 1 encoding (VH signal sequence)-(VH)-(5mer linker)-(VL)-(part of 12mer linker) and (12mer linker A DNA fragment fragment 2 encoding part)-(VH)-(5 mer linker)-(VL)-(Flag tag)-(stop codon) was obtained. A DNA fragment encoding sc (Fv) 2 was constructed by linking these two fragments using the Smal restriction enzyme recognition sequence present in the 12-mer linker.
- Primer KMTRltanA (SEQ ID NO: 37) is a Diabody expression vector
- the primer KMTRltanS contains a sequence encoding the 12-mer linker sequence including the Smal recognition sequence, followed by a sense sequence consisting of a sequence hybridizing to the VL end of the Diabody expression vector pCXND3 / KMTRl # 33. Have. Fragments 1 and 2 were amplified using these primers.
- the plasmid having the desired sequence was named pBS / KMTRltanFrl.
- the VH fragment is inserted under the control of the human EF1 ⁇ promoter. It expresses the W chain IgG H chain to which the human ⁇ chain constant region has been added.
- the expression vector HEF-PMlk-g ⁇ is obtained by inserting a fragment consisting of a signal sequence and VL to control Whole IgG in which a human L chain constant region has been added to the VL fragment under the control of the human EF1 ⁇ promoter. Express light chain. Whole IgG can be expressed by co-introducing these H and L chain expression vectors into animal cells such as COS-7.
- the H chain expression vector can be constructed as follows. Diabody expression vector In pCXND3 / KMTRl # 33, a signal sequence and a sequence encoding VH are inserted as a continuous DNA. Therefore, in order to recombine this signal sequence and the VH-encoding DNA into the expression vector HEF-PMh-gyl1, first use pCXND3 / KMTRl # 33 as a type III, and use a PCR method with appropriate primers. It is necessary to amplify the part of the sequence to be performed. Next, the amplified sequence is treated with a restriction enzyme or the like as necessary, and then inserted into an appropriately treated expression vector HEF-PMh-gyl !.
- an L chain expression vector can be performed as follows. Diabody expression vector pCXND3 / KMTRl # 33 contains VL but does not contain its signal sequence. Therefore, a sense primer that can add a nucleotide sequence corresponding to the KMTR1 antibody L chain signal sequence described in the patent (WO 02/094880 A1) to VL is designed and synthesized, and an appropriate antisense primer is synthesized. VL having a signal sequence can be amplified by performing PCR in combination with pCXND3 / KMTRl # 33 as type III. An L chain expression vector can be constructed by treating the thus amplified fragment with a restriction enzyme, if necessary, and inserting it into an appropriately treated expression vector HEF-PMlk-g ⁇ .
- the sense primer KMTRVHsp (SEQ ID NO: 39) was designed to hybridize to the amino terminal in the coding sequence of pCXND3 / KMTRl # 33.
- KMTRVHsp has a Hindm restriction enzyme recognition sequence added for cloning.
- KMTRVHap (SEQ ID NO: 40) was designed to hybridize to the carboxy terminus of the coding sequence of pCXND3 / KMTRl # 33 and have a splice donor sequence immediately after the carboxy terminus.
- KMTRVHap has a BamHI restriction enzyme recognition sequence added for clawing.
- the sense primer KMTRVLsp (SEQ ID NO: 41) contains a sequence encoding the signal sequence of KMTR1 VL described in the patent (WO 02/094880), and has a Kozak consensus sequence CCACC and a BamHI restriction enzyme recognition sequence upstream thereof. It was designed as follows.
- KMTRVLsp was designed to hybridize to the amino terminal of VL in the coding sequence of pCXND3 / KMTRl # 33. Furthermore, a Hindm restriction enzyme recognition sequence has been added for clawing.
- the antisense primer KMTRVLap (SEQ ID NO: 42) is a primer for pCXND3 / KMTRl # 33. It was designed to hybridize to the carboxy terminus of VL in the nucleotide sequence and to have a splice donor sequence immediately after the carboxy terminus.
- KMTRVLap has a BamHI restriction enzyme recognition sequence added for clawing!
- Tube VH contains 50 pmol of each primer KMTRVHsp and KMTRVHap
- Tube VL contains 50 pmol of each primer KMTRVLsp and KMTRVLap.
- Each 10 / zg of each expression vector constructed in 1. was introduced into COS-7 cells by an electoral port method using a Gene Pulser apparatus. That is, each DNA (10 g) was added to a 0.8 mL aliquot of 1 ⁇ 10 7 cells suspended in PBS, and pulsed at a dose of 1500 V and 25 ⁇ F. After a recovery period of 10 minutes at room temperature, the cells subjected to electoral poration were seeded in 30 mL of DMEM medium (GIBCO BRL) containing 10% fetal calf serum (GIBCO BRL). After culturing this overnight at 37 ° C and 5% CO, remove the medium and then add PBS.
- DMEM medium containing 10% fetal calf serum
- the cells were washed four times with, and added with 15 mL of CHO-S-SFMII medium (GIBCO BRL). This was incubated for 72 hours at 37 ° C and 5% CO, and the supernatant from which cell debris was removed by centrifugation was further treated with a 0.45 m filter, and the resultant was used as a culture supernatant for measurement of cytotoxicity.
- CHO-S-SFMII medium GEBCO BRL
- the concentrations of Diabody, Triabody and Tandem Diabody in the culture supernatant expressed in 2. were measured using a biosensor BIAcore2000 (BIACORE) using surface plasmon resonance. Flag tags were added to these antibodies. Therefore, analysis was performed using anti-Flag antibody M2 (Sigma). More specifically, the antibody was immobilized on a sensor chip CM5 (BIACORE) by an amine coupling method, and the surface plasmon resonance signal was measured by analyzing the culture supernatant using the sensor chip.
- the concentration of IgG in the culture supernatant expressed in step 2 was measured by ELISA.
- a substrate solution (Sigmal04, p-ditrophenyl phosphate, Sigma) was added, and the absorbance at 405 nm was measured using MICROPLATE READER Model 3550 (Bio-Rad). Human IgGl ⁇ (The Binding Site) was used as a standard for concentration measurement.
- Diabody, Triabody and Tandem Diabody in the culture supernatant expressed in 2. was evaluated by cytotoxic activity. Specifically, colorectal cancer cell line COLO 205 (ATCC CCL-222), in which TRAIL receptor expression was actually observed, was Each culture supernatant was seeded on a plate (FALCON) at 7.5 ⁇ 10 4 cells / well, and each culture supernatant serially diluted with CHO-S-SFMII (GIBCO BRL) was added to each well. As needed, anti-Flag antibody M2 (Sigma) was added as a crosslinker at a concentration of 10 g / mL.
- TRAIL natural ligand Apo2L recombinant (Sigma) diluted with CHO-S-SFMII was used as a positive control for cytotoxic activity evaluation.
- the microplate thus prepared is cultured overnight at 37 ° C and 5% CO.
- FIG. 1 shows the results of evaluating the cytotoxic activity of Diabody.
- FIG. 2 shows the results of evaluation of the cytotoxic activity of Triabody and Whole IgG.
- a low molecular weight antibody By reducing the molecular weight of an antibody, it is possible to have a higher specific activity and a shorter blood half-life. Therefore, the administration of low-molecular-weight antibodies makes it easier to adjust the effective blood concentration, which is advantageous for clinical applications compared to full-length antibodies such as IgG. Therefore, it is expected that a low molecular weight antibody can be an anticancer agent having properties superior to those of a conventional antibody.
- its expression system is not limited even when it is expressed as a recombinant protein. For example, it can be produced by various expression systems such as mammalian cell lines, yeast, insect cells, Escherichia coli and the like.
- a polyvalent, particularly a low-molecular-weight antibody having a trivalent or higher antigen-binding site can be used as an agonist antibody against a receptor that forms a trimer such as a TRAIL receptor and performs signal transmission. It was shown to be effective.
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Abstract
Description
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Priority Applications (3)
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US10/582,654 US20080206229A1 (en) | 2003-12-12 | 2004-12-10 | Modified Antibodies Recognizing Receptor Trimers or Higher Multimers |
JP2005516203A JPWO2005056605A1 (ja) | 2003-12-12 | 2004-12-10 | 3量体以上の受容体を認識する改変抗体 |
EP04820317A EP1710255A4 (en) | 2003-12-12 | 2004-12-10 | MODIFIED ANTIBODIES RECOGNIZING A TRIMER OR LARGER RECEPTOR |
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JP2003-415735 | 2003-12-12 | ||
JP2003415735 | 2003-12-12 |
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WO2005056605A1 true WO2005056605A1 (ja) | 2005-06-23 |
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PCT/JP2004/018507 WO2005056605A1 (ja) | 2003-12-12 | 2004-12-10 | 3量体以上の受容体を認識する改変抗体 |
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US (1) | US20080206229A1 (ja) |
EP (1) | EP1710255A4 (ja) |
JP (1) | JPWO2005056605A1 (ja) |
WO (1) | WO2005056605A1 (ja) |
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JPWO2005056605A1 (ja) | 2007-12-06 |
EP1710255A4 (en) | 2008-09-24 |
US20080206229A1 (en) | 2008-08-28 |
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