WO2005056798A1 - 抗体の活性を増強させる方法 - Google Patents
抗体の活性を増強させる方法 Download PDFInfo
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- WO2005056798A1 WO2005056798A1 PCT/JP2004/018493 JP2004018493W WO2005056798A1 WO 2005056798 A1 WO2005056798 A1 WO 2005056798A1 JP 2004018493 W JP2004018493 W JP 2004018493W WO 2005056798 A1 WO2005056798 A1 WO 2005056798A1
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- antibody
- chain variable
- linker
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
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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
-
- 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)
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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
- C07K2317/75—Agonist effect on antigen
Definitions
- the present invention relates to a method for enhancing the activity of an antibody.
- Antibodies have attracted attention as pharmaceuticals because of their high stability in blood and low antigenicity.
- an agonistic antibody capable of recognizing a protein such as a receptor expressed on the cell surface and generating a specific reaction in a cell is considered to be useful as a pharmaceutical.
- Several agonist antibodies have already been reported, including agonist antibodies against erythropoietin receptor (see Non-Patent Document 1), agonist antibodies against thrombopoietin receptor and agonist antibodies against CD47 (see Patent Documents 1 and 2). Have been.
- each of these agonist antibodies has been measured by various Atsey methods, their activities are all weak compared to natural ligands.
- their activities are all weak compared to natural ligands.
- an agonist antibody against thrombopoietin receptor belonging to the cytodynamic receptor family in order to exhibit agonist activity, first dimerize the TPO receptor, and then set an appropriate distance for transmitting the signal. It is essential to take it.
- antibody molecules are divalent and are considered to have no problem in dimerization of the receptor.However, since the molecular weight is about 150 kD, which is a huge molecule and the degree of structural freedom is considered to be small, binding is not possible. It is expected that it will not be possible to transmit sufficient activity because it is difficult to keep the appropriate receptor at a suitable distance for signal transduction.
- Patent Document 1 International Publication No. 02/33072
- Patent Document 2 WO 02/33073
- Non-Patent Document 1 Elliott S et al., J. Biol. Chem., 1996, Vol.271 (40), p.24691-24697 Disclosure of the invention
- the present invention has been made in view of such circumstances, and an object of the present invention is to provide a method for enhancing the activity of an antibody. Specifically, two or more heavy chain variable regions and two or more It is an object of the present invention to provide a method for enhancing the activity of an antibody by linking the light chain variable regions with a linker to form a single-chain polypeptide.
- Small antibodies specifically Diabody and sc (Fv) 2, have a molecular weight of about 60 kD, which is less than half, and have a relatively high degree of structural freedom. It would be possible to dimerize the receptor efficiently or to the same extent as the ligand, and it would be possible to exhibit high activity.
- the present inventors obtained and purified an anti-human Mpl antibody, and prepared a single-chain anti-human Mpl antibody VB22B using genetic engineering techniques.
- an anti-human Mpl antibody sc (Fv) 2 expression vector was constructed, and a single-chain antibody was transiently expressed in CHO-DG44 cells.
- VB22B sc (Fv) 2 was obtained.
- an anti-human Mpl antibody Diabody expression vector was constructed, and VB22B Diabody was obtained from the culture supernatant using C0S7 cells.
- the TP0-like agonist activity of each antibody was evaluated, it was confirmed that the single-chain antibody had a higher agonist activity. This indicates that antibody activity can be enhanced by combining two or more heavy chain variable regions and two or more light chain variable regions with a linker to form a single-chain polypeptide. .
- the present invention relates to a method for enhancing the activity of an antibody, more specifically,
- the DNA is characterized by encoding a heavy chain variable region, a peptide linker, a light chain variable region, a peptide linker, a heavy chain variable region, a peptide linker, and a light chain variable region in this order; [11] A production method according to [11].
- FIG. 1 is a view showing an amino acid sequence of an anti-human Mpl antibody (H chain and L chain).
- the amino acid sequence of VB140 (H chain) shown in the figure is SEQ ID NO: 19
- the amino acid sequence of VB45B (H chain) is SEQ ID NO: 20
- the amino acid sequence of VB22B (H chain) is SEQ ID NO: 21, VB16
- the amino acid sequence of H chain is shown in SEQ ID NO: 22
- the amino acid sequence of TA136 (H chain) is shown in SEQ ID NO: 23.
- the amino acid sequence of VB140 (L chain) is SEQ ID NO: 24, the amino acid sequence of VB45B (L chain) is SEQ ID NO: 25, the amino acid sequence of VB22B (L chain) is SEQ ID NO: 26, the amino acid sequence of VB16 (L chain) The sequence is shown in SEQ ID NO: 27, and the amino acid sequence of TA136 (L chain) is shown in SEQ ID NO: 28.
- FIG. 2 is a view showing a process for producing a main chain antibody sc (Fv) 2.
- FIG. 3 is a graph showing the results of evaluating the VB22B antibody's agonistic activity using BaF3-human Mpl.
- FIG. 4 is a graph showing the results of evaluating the VB22B antibody's agonist activity using BaF3-monkey Mpl. It is.
- FIG. 5 is a graph showing the results of evaluation of the agonist activity of VB16 antibody using BaF3-human Mpl.
- FIG. 6 is a graph showing the results of evaluation of the agonist activity of VB140 antibody using BaF3-human Mpl.
- FIG. 7 is a graph showing the results of evaluating the VB45B antibody's agonist activity using BaF3-human Mpl.
- FIG. 8 is a graph showing the results of evaluation of the agonist activity of TA136 antibody using BaF3-human Mpl.
- the present invention provides a method for enhancing the activity of an antibody by linking two or more heavy chain variable regions and two or more light chain variable regions with a linker to form a single-chain polypeptide.
- the antibody whose activity is enhanced by the method of the present invention may be any antibody, such as a mouse antibody, a human antibody, a rat antibody, a rabbit antibody, a camel antibody, or any other animal-derived antibody.
- a modified antibody in which the amino acid sequence has been substituted such as a chimeric antibody or a humanized antibody, or any antibody such as a modified antibody, an antibody fragment, or a sugar chain-modified antibody to which various molecules are bound may be used. Good.
- the antibody whose activity is enhanced by the antibody of the present invention may be a full-length antibody or a low-molecular-weight antibody such as a diabody! /.
- the single-chain polypeptide of the present invention includes, for example, a first polypeptide including a heavy chain variable region and a light chain variable region of an antibody, and a first polypeptide including a heavy chain variable region and a light chain variable region of the antibody.
- a first polypeptide including a heavy chain variable region and a light chain variable region of an antibody includes, for example, a single-chain polypeptide in which two polypeptides are linked by a linker.
- the first polypeptide containing the heavy chain variable region and the light chain variable region of the antibody and the second polypeptide containing the heavy chain variable region and the light chain variable region of the antibody may be the same polypeptide, or Different polypeptides may be used.
- the first polypeptide and the second polypeptide may be antibodies recognizing the same antigen or epitope, or bispecific antibodies recognizing different antigens or epitopes. Yo! / ⁇ .
- polypeptide containing a heavy chain variable region and a light chain variable region of an antibody include: For example, scFv (single chain Fv) can be mentioned. Accordingly, a single-chain polypeptide in which a first polypeptide containing a heavy chain variable region and a light chain variable region of an antibody and a second polypeptide containing a heavy chain variable region and a light chain variable region of the antibody are linked with a linker Examples of the peptide include sc (Fv) 2.
- sc (Fv) 2 is an antibody in which two heavy chain variable regions and two light chain variable regions are linked to each other with a linker or the like to form a single-chain polypeptide (Hudson et al, J Immunol. Methods 1999; 231: 177-189).
- the order of the two heavy-chain variable regions (VH) and two light-chain variable regions (VL) to be combined is not particularly limited, and may be arranged in any order. However, for example, the following arrangement can be given.
- sc (Fv) 2 having an arrangement of [VH] linker- [VL] linker- [VH] linker- [VL] is preferable.
- the amino acid sequence of the heavy chain variable region or light chain variable region may be substituted, deleted, added and Z- or inserted. Furthermore, when the heavy chain variable region and the light chain variable region are associated, a portion may be deleted or another polypeptide may be added as long as it has antigen-binding activity. Further, the variable region may be chimerized or humanized.
- Amino acid substitutions, deletions, additions and modifications of the amino acid sequence such as Z or insertion, humanization, chimerization, etc. may be performed after enhancing the activity by the method of the present invention, or the amino acid sequence may be modified. After modification, the activity may be enhanced by the method of the present invention.
- a chimeric antibody is an antibody produced by combining sequences derived from different animals.For example, an antibody composed of a heavy chain and a light chain variable region of a mouse antibody and a heavy chain and a light chain constant region of a human antibody is used. is there.
- a chimeric antibody can be prepared by a known method.For example, a DNA encoding the antibody V region is ligated to a DNA encoding the human antibody C region and expressed. It is obtained by incorporation into a container, introduction into a host, and production.
- a humanized antibody is also called a reshaped human antibody, which is used to determine the complementarity determining region (CDR) of a non-human mammal, for example, a mouse antibody. It has been transplanted into a region, and its general genetic recombination technique is also known (see European Patent Application Publication No. EP 125023, WO 96/02576).
- a CDR of a mouse antibody and a framework region of a human antibody (framework region;
- a DNA sequence designed to ligate to FR is synthesized by a PCR method using as primers several oligonucleotides prepared to have overlapping portions in both CDR and FR terminal regions (W098 / 13388).
- the framework region of a human antibody to be linked via CDR is selected so that the complementarity-determining region forms a favorable antigen-binding site. If necessary, the amino acids of the framework region in the variable region of the antibody may be substituted so that the complementarity determining region of the reshaped human antibody forms an appropriate antigen-binding site (Sato, K. et al., Cancer Res. (1993) 53, 851-856).
- a chimeric antibody comprises a variable region of an antibody derived from a non-human mammal and a constant region derived from a human antibody.
- a humanized antibody is composed of a complementarity determining region of an antibody derived from a mammal other than human, a framework region and a C region derived from a human antibody.
- variable region eg, FR
- amino acids in the variable region may be further substituted with another amino acid.
- the sequence of the variable region of the antibody may be the sequence of the variable region of an antibody that is already known, or an antibody may be prepared using any antigen by a method known to those skilled in the art and the sequence of the antibody It is also possible to obtain and use it. Specifically, for example, it can be performed as follows. Using an antigen, an immunized animal such as a mouse is immunized in accordance with a usual immunization method, the obtained immune cells are fused with known parent cells by a usual cell lysis method, and a monoclonal antibody is obtained by a conventional screening method. Screen for null antibody-producing cells (no, hybridoma). Preparation of the antigen can be performed by a known method. The production of a hybridoma is carried out, for example, by the method of Milstein et al. (
- V region variable region
- human lymphocytes can be sensitized in vitro, and the sensitized lymphocytes can be fused with human-derived myeloma cells having permanent division ability to obtain a desired human antibody having binding activity (Japanese Patent Publication No. No. 59878).
- an antigen may be administered to a transgenic animal having the entire repertoire of human antibody genes to obtain antibody-producing cells, and human antibodies to the antigen may be obtained from the immortalized cells (International Patent Application publication numbers WO 94/25585, WO 93/12227, WO 92/03918, WO 94/02602).
- a linker that binds a heavy chain variable region and a light chain variable region may be any peptide linker or synthetic compound linker (for example, Protein Engineering, 9 (3) ), 299-305, 1996.
- the length of the peptide linker is not particularly limited, and can be appropriately selected by those skilled in the art depending on the purpose. Usually, the length is 110 amino acids, preferably 5-30 amino acids, and particularly preferably. 12-18 amino acids (for example, 15 amino acids).
- amino acid sequence of the peptide linker examples include the following sequences.
- Synthetic chemical linkers are commonly used crosslinking agents for peptide crosslinking, for example, N-hydroxysuccinimide (NHS) disuccinimidyl suberate (DSS), bis (Sulfosuccinimidyl) suberate (BS 3 ), dithiobis (succinimidyl propionate) (DSP), dithiopis (sulfosuccinimidyl propionate) (DTSSP), ethylene glycol Bis (succinimidyl succinate) (EGS), ethylene glycol bis (sulfosuccinimidyl succinate) (sulfo EGS), disuccinimidyl tartrate (DST), disulfosuccinimidyl tartrate (Sulfo DST), bis [2- (succinimidoxycarbo-roxy) ethyl] sulfone (BSOCOES), bis [2- (sulfosuccinimid
- the present invention also provides an antibody whose activity has been enhanced by the above method.
- the present invention also provides a method for producing an antibody, comprising the following steps (a) to (d).
- DNAs encoding two or more antibody heavy chain variable regions, two or more antibody light chain variable regions, and a peptide linker that binds each variable region are prepared.
- DNAs include, for example, DNAs encoding two heavy chain variable regions (VH), two light chain variable regions (VL), and three peptide linkers, preferably sc (Fv) 2 Are listed.
- the order of two VHs and two VLs to be combined is not particularly limited, and may be arranged in any order. For example, the following arrangements can be given.
- the amino acid sequence of the heavy chain variable region or light chain variable region may be substituted, deleted, added and Z or inserted. Further, when the heavy chain variable region and the light chain variable region are associated, a part thereof may be deleted as long as it has antigen-binding activity.
- the variable region may be chimerized or humanized.
- E. coli when E. coli is used as a host, the vector is amplified in E. coli (for example, JM109, DH5a, HB101, XLlBlue) or the like in order to prepare a large amount of the vector.
- E. coli for example, JM109, DH5a, HB101, XLlBlue
- the gene has "ori” and further has a transformed gene for selection of Escherichia coli (for example, a drug resistance gene that can be identified by any drug (ampicillin, tetracycline, kanamycin, chloramphenicol)).
- solid vectors include M13-based vectors, pUC-based vectors, pBR322, pBluescript,
- an expression vector is particularly useful.
- the expression vector is intended for expression in Escherichia coli, in addition to having the above characteristics such that the vector is amplified in Escherichia coli, the host can be used in combination with Escherichia coli such as JM109, DH5a, HB101, and XL1-Blue. In such cases, promoters that can be efficiently expressed in E.
- coli such as the lacZ promoter (Ward et al., Nature (1989) 341, 544-546; FASEB J. (1992) 6, 2422-2427), the araB promoter (Better Et al., Science (1988) 240, 1041-1043), or have a T7 promoter.
- lacZ promoter Ward et al., Nature (1989) 341, 544-546; FASEB J. (1992) 6, 2422-2427
- araB promoter Better Et al., Science (1988) 240, 1041-1043
- T7 promoter include pGEX-5X-1 (Pharmacia), “QIAexpress system” (Qiagen), pEGFP, or pET (in this case, the host expresses T7 RNA polymerase in addition to the above vectors).
- BL21 is preferred).
- the vector contains a signal sequence for polypeptide secretion!
- a signal sequence for protein secretion a pelB signal sequence (Lei, SP, et al J. Bacteriol. (1987) 169, 4379) may be used for production in 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 vector of the present invention includes mammalian expression vectors (for example, pcDNA3 (manufactured by Invitrogen), pEGF-BOS (Nucleic Acids. Res. 1990, 18 ( 17), p5322), pEF, pCDM8), insect cell-derived expression vectors (eg, “pcDNA3 (manufactured by Invitrogen), pEGF-BOS (Nucleic Acids. Res. 1990, 18 ( 17), p5322), pEF, pCDM8), insect cell-derived expression vectors (eg, “pcDNA3 (manufactured by Invitrogen), pEGF-BOS (Nucleic Acids. Res. 1990, 18 ( 17), p5322), pEF, pCDM8), insect cell-derived expression vectors (eg, “pcDNA3 (manufactured by Invitrogen), pEGF-BOS (Nucleic Acids. Res. 1990, 18 ( 17), p
- Bac-to-BAC baculovairus expression systemj (manufactured by Gibco BRL), pBacPAK8), plant-derived expression vectors (eg, ⁇ 1, pMH2), animal virus-derived expression vectors (eg, pHSV, pMV, pAdexLcw), retrovirus-derived Expression vectors (for example, pZIPneo), yeast-derived expression vectors (for example, "Pichia Expression KitJ (manufactured by Invitrogen), pNVll, SP-Q01), and Bacillus subtilis-derived expression vectors (for example, pPL608, pKTH50) No.
- plant-derived expression vectors eg, ⁇ 1, pMH2
- animal virus-derived expression vectors eg, pHSV, pMV, pAdexLcw
- retrovirus-derived Expression vectors for example, pZIPneo
- yeast-derived expression vectors for example, "Pichia Expression KitJ (man
- promoters required for expression in cells for example, SV40 promoter (Muligan et al., Nature (1979) 277, 108), MMTV-LTR promoter, EF1 ⁇ promoter (Mizushima et al., Nucleic Acids Res. (1990) 18, 5322), CMV promoter, etc. It is indispensable to have a gene for selecting transformation into cells (for example, a drug resistance gene that can be identified by a drug (neomycin, G418, etc.)). Vectors having such properties include, for example, pMAM, pDR2, pBK-RSV, pBK-CMV, pOPRSV, pOP13, and the like.
- a DHFR gene complementing the CHO cell lacking the nucleic acid synthesis pathway is used.
- MTX methotrexate
- a method of using a COS cell having a gene expressing the SV40 T antigen on the chromosome and transforming it with a vector having a replication origin of SV40 is used.
- a replication origin of SV40 such as pcD
- those derived from poliovirus, adenovirus, ⁇ papilloma virus (BPV) and the like can also be used.
- the expression vector is selected as a selection marker for aminoglycoside transferase (APH) gene, thymidine kinase (TK) gene, Escherichia coli xanthinguanine phosphoribosyltransferase (Ecogpt) gene, It can contain the folate reductase (dhfr) gene and the like.
- the vector is introduced into a host cell in the following!
- the host cell into which the vector is introduced is not particularly limited.
- Escherichia coli and various animal cells can be used.
- the host cell may be used, for example, to produce or express a polypeptide comprising two or more antibody heavy chain variable regions, two or more antibody light chain variable regions, and a peptide linker that binds each variable region of the present invention.
- Production systems for polypeptide production include in vitro and in vivo production systems. Production systems in vitro include production systems using eukaryotic cells and production systems using prokaryotic cells.
- animal cells for example, animal cells, plant cells, and fungal cells can be used as hosts.
- Animal cells include mammalian cells, for example, CH0 (J. Exp. Med. (1995) 108, 945), COS-3T3, myeloma, BHK (baby hamster kidney), HeLa, Vero, amphibian cells, for example, African Megafrog oocytes (Valle, et al., Nature (1981) 291, 358-340) or insect cells such as S19, Sf21, and Tn5 are known.
- CH0 J. Exp. Med. (1995) 108, 945
- myeloma myeloma
- BHK baby hamster kidney
- HeLa Vero
- amphibian cells for example, African Megafrog oocytes (Valle, et al., Nature (1981) 291, 358-340) or insect cells such as S19, Sf21, and Tn5 are known.
- CHO cells are particularly preferred for the purpose of large-scale expression.
- the vector can be introduced into a host cell by, for example, a calcium phosphate method, a DEAE dextran method, a method using catonic ribosome DOTAP (manufactured by Boehringer Mannheim), an electoral poration method, a Lipofexion method, or the like. .
- a cell force S protein production system derived from Nicotiana tabacum (Nicotiana tabacum) is known, and it may be callus cultured.
- Fungal cells include yeast, for example, Saccharomyces, for example, Saccharomyces cerevisiae, Saccharo; Saccharomyces pombe, filamentous fungi, for example, Aspergillus, for example. Aspergillus nigerj is known.
- bacterial cells When using prokaryotic cells, there is a production system using bacterial cells.
- bacterial cells include Escherichia coli (E. coli), for example, JM109, DH5a, HB101, and the like, and Bacillus subtilis.
- the above host cells are then cultured.
- An antibody can be obtained by culturing cells transformed with the target DNA in vitro.
- the culturing can be performed according to a known method.
- DMEM, MEM, RPMI1640, IMDM can be used as a culture solution of animal cells.
- a serum replacement fluid such as FBS or fetal calf serum (FCS) can be used together, or serum-free culture may be performed.
- 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.
- examples of a system for producing a polypeptide in vivo include a production system using animals and a production system using plants.
- the desired DNA is introduced into these animals or plants, and the polypeptide is produced in the animals or plants and collected.
- the “host” in the present invention includes these animals and plants.
- the target DNA is prepared as a fusion gene with a gene encoding a polypeptide, such as goat / 3-casein, which is specifically produced in milk.
- a polypeptide such as goat / 3-casein
- the DNA fragment containing the fusion gene is injected into a goat embryo, and the embryo is transplanted into a female goat.
- the target protein can be obtained from milk produced by the transgenic goat born from the goat that has received the embryo or its progeny.
- Transgeneic zebras can also use hormones in transgenetics as appropriate to increase the amount of milk containing the protein produced (Ebert, KM et al., Bio / Technology (1994). ) 12, 699-702).
- a silkworm can be used as an insect.
- the target antibody can be obtained from the body fluid of the silkworm by infecting the silkworm with a baculovirus into which DNA encoding the protein of interest has been inserted (Susumu, M. et al., Nature ( 1985) 315, 592-594) o
- tobacco when using a plant, for example, tobacco can be used.
- DNA encoding the antibody of interest is introduced into a plant expression vector, for example, pMON530, and this vector is introduced into bacteria such as Agrobacterium tumefaciens.
- the bacteria are infected with tobacco, for example, Nicotiana tabacum, and the desired antibody can be obtained from the leaves of the tobacco (Julian K.-C. Ma et al, Eur. J. Immunol. (1994) 24, 131-138).
- the antibody thus obtained can be isolated from the host cell or outside the cell (such as a medium) and purified as a substantially pure and homogeneous antibody.
- the separation and purification of the antibody is not limited at all, provided that the separation and purification methods used in ordinary purification of polypeptides are used. For example, select chromatography column, filter, ultrafiltration, salting out, solvent precipitation, solvent extraction, distillation, immunoprecipitation, SDS-polyacrylamide gel electrophoresis, isoelectric focusing, dialysis, recrystallization, etc. If combined, antibodies can be separated and purified.
- Examples of the chromatography include affinity chromatography, ion exchange chromatography, hydrophobic chromatography, gel filtration, reverse phase chromatography, adsorption chromatography, and the like (Strategies for Protein Purification and Ed Daniel R. Marshak et al "Cold Spring Harbor Laboratory Press, 1996). These chromatographies are performed using liquid chromatography such as liquid phase chromatography such as HPLC and FPLC.
- Columns used for affinity chromatography include protein A columns and protein G columns, for example, columns using protein A include Hyper D, POROS, Sepharose FF (Pharmacia) and the like.
- modification can be arbitrarily performed or the peptide can be partially removed.
- protein modifying enzyme for example, trypsin, chymotrypsin, lysyl endopeptidase, protein kinase, dalcosidase and the like are used.
- the activity of the antibody enhanced in the present invention may be any activity such as a binding activity, a neutralizing activity, a cytotoxic activity, an agonist activity, an antagonist activity, and an enzymatic activity, and is particularly limited.
- agonist activity which is preferably an activity that causes quantitative and / or qualitative changes or effects on living organisms, tissues, cells, proteins, DNA, RNA, etc., is particularly preferred.
- the agonist activity is an activity that induces a change in some physiological activity by, for example, transmitting an intracellular signal by binding of an antibody to an antigen such as a receptor.
- Physiological activities include, for example, proliferation activity, survival activity, differentiation activity, transcription activity, membrane transport activity, binding activity, proteolytic activity, phosphorylation Z, dephosphorylation activity, redox activity, transfer activity, Forces that can include nucleolytic activity, dehydration activity, cell death inducing activity, apoptosis inducing activity, and the like, but are not limited thereto.
- the antigen is not particularly limited, and any antigen may be used!
- antigens include, for example, receptors, cancer antigens, MHC antigens, differentiation antigens, and the like.
- the receptor examples include, for example, hematopoietic factor receptor family, cytokinin receptor family, tyrosine kinase type receptor family, serine Z threonine kinase type receptor family, TNF receptor family, G protein Receptors belonging to the receptor family such as the coupled receptor family, the GPI-anchored receptor family, the tyrosine phosphatase receptor family, the adhesion factor family, the holmon receptor family, and the like can be given.
- Specific receptors belonging to the above receptor family include, for example, human or mouse erythropoietin (EPO) receptor, human or mouse granulocyte colony stimulating factor (G-CSF) receptor, human or mouse thrombopoi.
- EPO erythropoietin
- G-CSF granulocyte colony stimulating factor
- Etin (TPO) receptor human or mouse insulin receptor, human or mouse Flt-3 ligand receptor, human or mouse platelet derived growth factor (PDGF) receptor, human or mouse interferon (IFN)-a, j8 receptor Human or mouse leptin receptor, human or mouse growth hormone (GH) receptor, human or mouse interleukin (IL) -10 receptor, human or mouse insulin-like growth factor (IGF) -I receptor, human or mouse Examples include leukemia inhibitory factor (LIF) receptor, human or mouse ciliary neurotrophic factor (CNTF) receptor (hEPOR: Simon, S. et al. (1990) Blood 76, 31-35 .; mE POR: D'Andrea, AD. Et al.
- LIF leukemia inhibitory factor
- CNTF ciliary neurotrophic factor
- hG— CSFR Fukunaga, R. et al. (1990) Proc. Natl. Acad. Sci. USA. 87, 8702— 8706 .
- mG—CSFR Fukunaga, R. et al. (1990) Cell 61, 341-350 .
- hTPOR Vigon, I. et al. (1992) 89, 5640-5644 .
- mTPOR Skoda, RC. Et al. (1993) 12, 2645-2653 .
- hlnsR Ullrich, A. et al.
- Cancer antigens are antigens that are expressed as cells become malignant, and are also called tumor-specific antigens.
- abnormal sugar chains that appear on the cell surface or on protein molecules when cells become cancerous also serve as cancer antigens, and are particularly called cancer sugar chain antigens.
- cancer antigens include, for example, CA19-9, CA15-3, serial SSEA-1 (SLX) and the like.
- MHC antigens are roughly classified into MHC class I antigens and MHC class II antigens, and MHC class I antigens include HLA-LA, - ⁇ , -C, - ⁇ , -F, -G,- H, MHC class II antigens include:
- any quantitative and Z or qualitative change can be used as long as it can be measured.
- an index for a cell-free system (cell free assay), an index for a cell system (ceU-based assay), an index for a silk tissue system, and an index for a biological system can be used.
- an enzymatic reaction or a quantitative and Z- or qualitative change of protein, DNA, or RNA can be used.
- the enzyme reaction for example, an amino acid transfer reaction, a sugar transfer reaction, a dehydration reaction, a dehydrogenation reaction, a substrate cleavage reaction and the like can be used.
- protein phosphorylation, dephosphorylation, dimerization, multimerization, degradation, dissociation, etc., and amplification and cleavage and extension of DNA and RNA can be used.
- phosphorylation of a protein existing downstream of the signal transduction pathway can be used as a detection index.
- Cell line indicators include changes in cell phenotype, for example, changes in the quantity and Z or qualitative of a product, changes in proliferation activity, changes in cell number, changes in morphology, changes in characteristics, and the like. Can be used. As a substance to be produced, secretory proteins, surface antigens, intracellular proteins, mRNA and the like can be used. Changes in morphology include projection formation and changes in the number of Z or projections, changes in flatness, changes in elongation Z, aspect ratio, changes in cell size, and changes in internal structure. Changes, heterogeneity as a cell population z uniformity, changes in cell density, etc. can be used. These morphological changes can be confirmed by observation under a microscope.
- scaffold dependency As the property change, scaffold dependency, site force-in response, hormone dependency, drug resistance, cell motility, cell migration activity, pulsatility, change in intracellular substance, and the like can be used.
- Cell motility includes cell infiltration activity and cell migration activity.
- examples of the change of the intracellular substance include an enzyme activity, an mRNA amount, an intracellular information transmitting substance amount such as Ca 2+ and cAMP, an intracellular protein mass, and the like.
- a change in cell proliferation activity induced by receptor stimulation can be used as an index.
- a change in function according to the tissue to be used can be used as a detection index.
- Indicators of biological systems include changes in tissue weight, changes in blood systems, such as changes in the number of blood cells, changes in protein amount, enzyme activity, and electrolytic mass, and changes in circulatory systems, such as blood pressure and heart rate Can be used.
- Methods for measuring these detection indices include, but are not limited to, light absorption, luminescence, color development, fluorescence, radioactivity, fluorescence polarization, surface plasmon resonance signal, time-resolved fluorescence, mass, absorption spectrum, light Scattering, fluorescence resonance energy transfer, and the like can be used. These measurement methods are well known to those skilled in the art, and can be appropriately selected according to the purpose.
- the absorption spectrum can be measured with a commonly used photometer or plate reader
- the emitted light can be measured with a luminometer or the like
- the fluorescence can be measured with a fluorimeter or the like.
- the mass can be measured using a mass spectrometer. Radioactivity is measured using a measuring instrument such as a gamma counter according to the type of radiation, fluorescence polarization is measured by BEACON (Takara Shuzo), surface plasmon resonance signal is measured by BIACORE, time-resolved fluorescence, fluorescence resonance energy transfer is measured by ARVO, etc. it can. Further, a flow cytometer or the like can be used for the measurement.
- fluorescence and fluorescence resonance energy transfer can be measured simultaneously with a fluorimeter.
- agonist activity can be measured by a method known to those skilled in the art. Noh. For example, it can be determined by a method of measuring an agonist activity using cell proliferation as an index as described in the Examples. More specifically, an antibody whose agonist activity is to be measured is added to cells exhibiting agonist-dependent proliferation, and cultured. After that, it is possible to add a reagent that produces a color reaction at a specific wavelength according to the number of viable cells, such as WST-8, and measure the absorbance, and measure the agonist activity using the obtained absorbance as an index. .
- Cells exhibiting an agonist-dependent proliferation can also be prepared by a method known to those skilled in the art.
- the receptor when the antigen is a receptor that emits a cell proliferation signal, the receptor may be used.
- An expressing cell may be used.
- the antigen is a receptor that does not emit a cell proliferation signal
- a chimeric receptor comprising an intracellular region of a receptor that emits a cell proliferation signal and an extracellular region of a receptor that does not emit a cell proliferation signal is used.
- the receptor that emits a cell proliferation signal include, for example, G-CSF receptor, mpl, neu, GM-CSF receptor, EPO receptor, c-kit, FLT-3 and the like.
- Examples of cells that express the receptor include BaF3, NFS60, FDCP-1, FDCP-2, CTLL-2, DA-1, KT-3 and the like.
- the virulent monkey Mpl cDNA (SEQ ID NO: 1, the DNA encoded by the base sequence) was used.
- the amino acid sequence of the protein was cloned according to SEQ ID NO: 2).
- the obtained force-quiz cDNA was inserted into pCOS2 to construct pCOS2-monkeyMplfoll.
- Each vector was prepared (20 mu g) was mixed with BaF3 cells (lxl0 7 cells / mL) suspended into PBS, using Karoe, Gene Pulser II a (Bio- manufactured Rad) in Gene Pulser cuvettes A pulse was produced with a capacity of 0.33 kV and 950 ⁇ FD.
- BaF3 cells transfected by electoral poration were transfected with Ing / mL mouse interleukin 3 (hereinafter, mIL-3, manufactured by Peprotech), 500 g / mL Geneticin (manufactured by Invitrogen), and 10% FBS (manufactured by Invitrogen).
- the cells were selected in addition to the RPMI1640 medium (manufactured by Invitrogen) and a human Mpl-expressing BaF3 cell line (hereinafter, BaF3-human Mpl) and a monkey Mpl-expressing BaF3 cell line (hereinafter, BaF3-monkey Mpl) were established. After the selection, the cells were cultured and maintained using RPMI1640 medium containing Ing / mL rhTPO (R & D) and 10% FBS.
- RPMI1640 medium manufactured by Invitrogen
- BaF3-human Mpl human Mpl-expressing BaF3 cell line
- BaF3-monkey Mpl a monkey Mpl-expressing BaF3 cell line
- a CHO cell line expressing the full-length Mpl gene was established.
- the DHFR gene expression site of pCHOI was inserted into the Hindlll site of pCXN2 (Niwa et al., Gene 1991; 108: 193-199) to produce an expression vector PCXND3.
- pCOS2-hMplfoll and pCOS2-monkeyMplfoll as ⁇ type
- each Mpl gene amplified by PCR using Primer containing His-tag sequence was cloned into pCXND3, and pCXND3-hMp His and pCXND3-monkey Mp His was built.
- Each vector was prepared (25 mu g) were mixed in suspended CHO- DG44 cells (lxl0 7 cells / mL) into PBS, added to the Gene Pulser cuvette, the Gene Pulser II (Bio- manufactured Rad) Pulses were obtained at a capacity of 1.5 kV and 25 ⁇ FD.
- CHO cells transfected by electoral poration were added to a CHO-S-SFMII medium (Invitrogen) containing 500 ⁇ g / mL Geneticin and lxHT (Invitrogen) and selected, and a human Mpl-expressing CHO cell line was selected.
- CHO-human Mpl and a monkey Mpl-expressing CHO cell line (hereinafter, CHO-monkey Mpl) were established.
- soluble human Mpl protein an expression system secreted and produced in insect cell S19 cells was constructed as follows.
- a FLAG-tagged gene was prepared downstream of the extracellular region of human Mpl (Gln26 force Trp491), inserted into the Pstl-Smal site of pBACSurf-1 Transfer Plasmid (Novagen), and inserted into pBACSurfl-hMp FLAG.
- Bac-N-Blue Using Transfection Kit Invitrogen
- 4 g of pBACSurfl-hMp-FLAG was introduced into S19 cells. After 3 days of culture, the culture supernatant was collected, and the recombinant virus was isolated by plaque assay. After preparation of the virus stock, S19 cells were infected and the culture supernatant was collected.
- soluble human Mpl protein was purified as follows. After adsorbing the culture supernatant to Q Sepharose Fast Flow (manufactured by Amersham Biosciences), the culture supernatant was eluted using 50 mM Na-Phosphate Buffer, 0.01% (v / v) Tween 20, 500 mM NaCl (pH 7.2). After adsorbing the eluate on FLAG M2-Agarose (manufactured by SIGMA-ALDRICH), the eluate was eluted using lOOmM Glycine-HC1, 0.01% (v / v) Tween20 (pH 3.5).
- the human MpHgG Fc fusion protein gene was prepared according to the method of Bennett et al. (Bennett et al., J. Biol. Chem. 1991; 266: 23060-23067).
- the nucleotide sequence encoding the extracellular region of human Mpl (Gln26 to Trp491) is linked to the nucleotide sequence encoding the Fc region of human IgG- ⁇ 1 (the region downstream from Asp216), and BstEII is used as a fusion linker at the junction.
- a sequence (amino acid VaKThr) was added.
- the signal sequence used was 19 amino acids of the signal peptide of the human IgG heavy chain variable region.
- the obtained human MpHgG Fc fusion protein gene was cloned into pCXND3 to construct pCXND3-hMpFc.
- Each vector was prepared (25 mu g) were mixed and suspended in PBS CHO- DG44 cells (lxl0 7 cells / mL), Karoe the Gene Pulser cuvette, Gene Pulser II (Bio- Rad, Inc.) A pulse was produced at 1.5 kV, 25 FD capacity using.
- CHO cells transfected by electoral poration were added to a CHO-S-SFMII medium containing 500 g / mL Geneticin and ⁇ to select, and a shMPL-Fc expressing CHO cell line (CHO-hMp Fc) was established. .
- a human MpHgG Fc fusion protein was purified as follows. After adsorbing the culture supernatant to Q Sepharose Fast Flow (manufactured by Amersham Biosciences), it was eluted using 50 mM Na-Phosphate Buffer, 0.01% (v / v) Tween20, 1M NaCl (pH 7.6). The eluate is adsorbed on a HiTrap protein G HP column (Amersham Biosciences). After that, elution was performed using 0.1 M Glycine-HC1, 150 mM NaCl, 0.01% (v / v) Tween20 (pH 2.7).
- MRL / MpJUmmCrj-lpr / lpr mice purchased from Nippon Charles' Riva.
- MRL / lpr mice purchased from Nippon Charles' Riva.
- 100 / z g / animal shMPL-FLAG was supplemented with Freund's complete adjuvant (H37 Ra, manufactured by Betaton's Dickinson), and the emulsion was subcutaneously administered.
- a booster immunization was performed by adding 50 g / animal shMPL-FLAG to Freund's incomplete adjuvant (Betaton-Dickinson) and subcutaneously administering the emulsified preparation.
- a final immunization was performed by intravenously administering shMPL-FLAG to each animal.
- P3-X63Ag8Ul (P3U1, purchased from ATCC) and mouse spleen cells were mixed, and cell fusion was performed by mixing Polyethylene Glycol 1500 (manufactured by Roche Diagnostics) while mixing. From the next day, selection was performed using a HAT medium, and the culture supernatant was used as an indicator for ELISA using an immunoplate with immobilized shMp-FLAG or hMp-Fc and cell growth activity using BaF3-hMpl as an index. Screening was performed. After the positive clones were subjected to monoclonal dilution by the limiting dilution method, expansion culture was performed, and the culture supernatant was recovered. By this method, hybridomas VB22B, VB16, VB140, and VB45B producing anti-human Mpl antibodies were obtained.
- BaF3-human Mpl was administered to Balb / C mice (purchased from Nippon Chill's Liver) at 1x10 7 cells intraperitoneally at intervals of 1 week to 5 months for a total of 11 mice. Spleen cells were fused with mouse myeloma cell P3U1 in the same manner as described above. From the next day, selection was carried out using a HAT medium, and screening using the culture supernatant was performed using BaF3-hMpl as an indicator of cell proliferation activity. Positive clones were subjected to monoclonal dilution by the limiting dilution method, then expanded, and the culture supernatant was recovered. According to this method, a hybridoma TA136 producing an anti-human Mpl antibody was obtained.
- Antibody concentration was determined by performing mouse IgG sandwich ELISA using goat anti-mouse IgG (gamma) (manufactured by ZYMED) and alkaline phosphatase anti-mouse IgG (manufactured by gammaXZYMED) to obtain commercially available antibodies of the same isotype.
- a calibration curve was prepared using GraphPad Prism (GraphPad Software, USA) as a standard, and the antibody concentration was converted.
- the antibody isotype was determined by an antigen-dependent ELISA using an isotype-specific secondary antibody. Adjust the coating buffer (O.lmM NaHCO) so that the hMp Fc becomes 1 ⁇ g / mL.
- Diluent buffer 50 mM Tris-HCl (pH8.1), ImM MgCl, 150 mM NaCl,
- shMp FLAG and hMPL-Fc The binding activity to shMp FLAG and hMPL-Fc was evaluated by ELISA.
- the purified shMp FLAG and hMPL-Fc were coated at a concentration of 1 ⁇ g / mL, and blocking treatment was performed with a Diluent buffer.
- the culture supernatant of the hybridoma was dried and left at room temperature for 1 hour, and an anti-mouse IgG antibody (Zymed) labeled with Alkaline Phosphatase was added thereto, followed by color development in the same manner as described above. After color development at room temperature for 1 hour, the absorbance at 405 was measured, and the EC value was calculated using GraphPad Prism.
- CHO- human Mp Fireflys is recovered CHO- monkey Mpl, and suspended in FACS Buffer (1% FBS / PBS ) so as to lxl0 6 cells / mL.
- FACS Buffer 1% FBS / PBS
- the solution was dispensed into Multiscreen (manufactured by Millipore) at 100 L / well, and the culture supernatant was removed by centrifugation.
- the culture supernatant diluted to 5 g / mL was added and reacted on ice for 30 minutes.
- the cells were washed once with FACS buffer, added with FITC-labeled anti-mouse IgG antibody (manufactured by Beckman Coulter), and allowed to react on ice for 30 minutes.
- the mixture was centrifuged at 500 rpm for 1 minute, the supernatant was removed, the cells were suspended in 400 ⁇ l of FACS Buffer, and subjected to flow cytometry using EPICS ELITE ESP (Beckman Coulter). Gates were set on the live cell population using histograms of forward scatter and side scatter.
- the agonist activity of the antibody is similar to that of BaF3-human Mp
- Anti-human Mpl antibody was purified using the culture supernatant of hybridoma as described below.
- the culture supernatant was adsorbed on a HiTrap protein G HP column (Amersham Biosciences) and eluted with 0.1 M Glycine-HC1 (pH 2.7).
- Glycine-HC1 pH 2.7
- the mixture was immediately neutralized with 1M Tris-Cl (pH 9.0), dialyzed against PBS for 24 hours, and replaced with a buffer.
- the following shows an example of preparing a single-chain antibody of the anti-human Mpl antibody VB22B.
- dNTPs 0.2 mM dNTPs (dATP, dGTP, dCTP, dTTP),
- the reaction temperature conditions are as follows.
- reaction product was heated at 72 ° C for 7 minutes.
- the PCR product was purified by agarose gel using a QIAquick Gel Extraction Kit (manufactured by QIAGEN) and then cloned into a pGEM-T Easy vector (manufactured by Promega). Furthermore, the nucleotide sequence was determined using ABI 3700 DNA Analyzer (manufactured by Perkin Elmer).
- VB22B-VH The nucleotide sequence of the cloned VB22B H chain variable region (hereinafter, VB22B-VH) is shown in SEQ ID NO: 5, the amino acid sequence of the protein encoded by the nucleotide sequence is shown in SEQ ID NO: 6, and the L chain variable region (hereinafter, referred to as VB22B-VH). , VB22B-VL) is shown in SEQ ID NO: 7, and the amino acid sequence of the protein encoded by the nucleotide sequence is shown in SEQ ID NO: 8.
- FIG. 1 shows the amino acid sequences of VB22B, VB16, VB140, VB45B, and TA136.
- VB22B Diabody a single-chain Fv (hereinafter referred to as “VB22B Diabody”) using a linker sequence consisting of 5 amino acids is the 3 ′ end of the gene encoding VB22B-VH and the gene encoding VB22B-VL. 'A linker with a terminal (Gly Ser) force
- VB22B-VH front primer 70 ⁇ 115HF (SEQ ID NO: 9) was designed to have an EcoRI site
- VB22B-VH rear primer 33 ⁇ 115HR (SEQ ID NO: 10) was designed to have a VB22B-VH primer.
- VB22B-VL forward primer 33-115LF (SEQ ID NO: 11) is a primer consisting of the nucleotide sequence encoding the N-terminus of VB22B-VL and (Gly Ser).
- composition of the PCR reaction solution (50 L) is shown below.
- dNTPs dATP, dGTP, dCTP, dTTP
- pGEM-T Easy vector containing lOng VB22B-VH or VB22B-VL gene, lOpmol synthetic oligonucleotide 70 '115HF, 33115 HR or 33115LF, 33115LR
- the reaction temperature conditions are as follows.
- reaction product was heated at 72 ° C for 5 minutes.
- composition of the PCR reaction solution (50 L) is shown below.
- dNTPs dATP, dGTP, dCTP, dTTP
- the reaction temperature conditions are as follows.
- reaction product was heated at 72 ° C for 5 minutes.
- the PCR product of about 800 bp was purified for agarose gel using QIAquick Gel Extraction Kit (QIAGEN), and then digested with restriction enzymes EcoRI (Takara Shuzo) and restriction enzyme Notl (Takara Shuzo). After that, the resultant was purified using a QIAquick PCR Purification Kit (manufactured by QIAGEN) and cloned into pCXND3 to prepare pCXND3-VB22B db.
- QIAquick Gel Extraction Kit QIAquick Gel Extraction Kit
- a plasmid expressing a modified antibody [sc (Fv) 2] containing two H chain variable regions and two L chain variable regions derived from VB22B was used as follows. It was modified by the PCR method.
- Fig. 2 shows the construction process of the sc (Fv) 2 gene.
- nucleotide sequence encoding a linker (Gly Ser) having 15 amino acids is added to the 3 ′ end of the gene encoding VB22B-VH and the 5 ′ end of the gene encoding VB22B-VL.
- VB22B-VH The forward primer VB22B_ft) vu (Primer A, SEQ ID NO: 14) was designed to have an EcoRI site at the 5 'end and to convert Gln22 and Leu23 of VB22B db to a PvuII site.
- the rear primer sc-rL15 (primer B, SEQ ID NO: 15) of VB22B-VH hybridizes to the DNA encoding the C-terminus of VB22B-VH and has a (Gly Ser) linker.
- the forward primer SC-1L15 (primer C, SEQ ID NO: 16) of VB22B-VL is composed of a nucleotide sequence encoding the N-terminus of VB22B-VL and (Gly Ser)
- composition of the PCR reaction solution (50 L) is shown below.
- dNTPs dATP, dGTP, dCTP, dTTP
- the reaction temperature conditions are as follows.
- reaction product was heated at 72 ° C for 5 minutes.
- dNTPs dATP, dGTP, dCTP, dTTP
- the reaction temperature conditions are as follows.
- reaction product was heated at 72 ° C for 5 minutes.
- the PCR product of about 800 bp was also purified using a QIAquick Gel Extraction Kit (manufactured by QIAGEN) to purify agarose gel, and then digested with EcoRI (Takara Shuzo) and Notl (Takara Shuzo). After that, the product was purified using a QIAquick PCR Purification Kit (manufactured by QIAGEN) and cloned into pBacPAK9 (manufactured by CLONTECH) to prepare pBacPAK9-scVB22B.
- QIAquick Gel Extraction Kit manufactured by QIAGEN
- a fragment to be inserted into the PvuII site of pBacPAK9_scVB22B was prepared. That is, an amino acid in which VB22B-VH and VB22B-VL lacking the N-terminal are linked by a linker (Gly Ser) force.
- the forward primer Fv2_f (primer E, SEQ ID NO: 17) of the target fragment was designed to have a PvuII site at the 5 ′ end and a sequence at the 5 ′ end of VB22B-VH.
- the rear primer Fv2-r (Primer F, SEQ ID NO: 18) of the target fragment hybridizes to the DNA encoding the C-terminus of VB22B-VL and comprises a linker consisting of (Gly Ser).
- Nucleotide sequence that encodes the nucleotide sequence that hybridizes to the DNA encoding the N-terminus of VB22B-VH It was designed to have a PvuII site. Using pBacPAK9-scVB22B as type III, PCR was performed as follows.
- composition of the PCR reaction solution (50 L) is shown below.
- dNTPs dATP, dGTP, dCTP, dTTP
- the reaction temperature conditions are as follows.
- reaction product was heated at 72 ° C for 5 minutes.
- the approximately 800 bp PCR product was purified from agarose gel using the QIAquick Gel Extraction Kit (QIAGEN), and then cloned into a pGEM-T Easy vector (Promega). After the nucleotide sequence was determined, the target fragment was recovered after digestion with the restriction enzyme PvuII (Takara Shuzo). After digestion with restriction pBacPAK9_scVB22B enzyme PvuII (manufactured by Takara Shuzo) was ligated to recovered fragment to prepare a P BacPAK9-VB22B sc (Fv) 2.
- CHO-DG44 cells (1 ⁇ 10 7 cells / mL) suspended in expression vector (25 ⁇ g) and PBS ) was cooled on ice for 10 minutes, transferred to a cuvette and pulsed at 1.5 kV, 25 FD capacity. After a 10-minute recovery period at room temperature, electroporated cells should contain 500 ⁇ g / mL Geneticin (Invitrogen).
- a CHO-S-SFMII medium (manufactured by Invitrogen) was selected for selection to establish an expression CHO cell line.
- VB22B sc (Fv) 2 a cell line stably expressing and a culture supernatant thereof were prepared by this method.
- Transient expression of a single-chain antibody using COS7 cells was performed as follows. A mixture of expression vector (10 ⁇ g) and 0.75 mL of COS7 cells (1 ⁇ 10 7 cells / mL) suspended in PBS was cooled on ice for 10 minutes, transferred to a cuvette, and then transferred to a 1.5 kV, 25 kV cell. Pulses were given with a ⁇ FD capacity. After a recovery period of 10 minutes at room temperature, the cells treated with the electoral port were treated with DMEM medium (manufactured by Invitrogen) containing 10% FBS, cultured for 1 hour, washed with PBS, and washed with CHO-S- The SFMII medium was cultured and cultured for about 3 days. The culture supernatant of VB22B Diabody was prepared by this method.
- DMEM medium manufactured by Invitrogen
- the concentration of the anti-human Mpl-chain antibody transiently expressed in COS7 cells or CHO cells in the culture supernatant was measured using surface plasmon resonance.
- ANTI-FLAG M2 Monoclonal Antibody SIGMA-ALDRICH
- a sample of an appropriate concentration was flowed at a flow rate of 5 mL / sec, and 50 mM getylamine was flowed to dissociate the bound antibody.
- the mass change when flowing the sample was measured, and the concentration was calculated using a calibration curve created based on the mass change of the standard product.
- the standard for Diabody used was dbl2E10 (see Japanese Patent Application No. 2001-27734), and the standard for sc (Fv) 2 used was 12E10 sc (Fv) 2 having the same gene structure.
- Anti-Flag M2 Affinity Gel (SIGMA-ALDRICH) column prepared by equilibrating the culture supernatant of VB22B Diabody expressing C0S7 cells or CH0 cells with 50 mM Tris-HCl (pH 7.4), 150 mM NaCl, 0.05% Tween20 And eluted with 100 mM Glycine-HCl (pH 3.5). The eluted fraction is immediately neutralized with 1 M Tris-HCl (pH 8.0), and subjected to gel filtration chromatography using a HiLoad 26/60 Superdex200pg (Amersham-Bioscience) column. Did one. As a buffer for gel filtration chromatography, PBS and 0.01% Tween20 were used.
- VB22B sc (Fv) 2-expressing culture supernatants of COS7 cells or CHO cells were purified under the same conditions as for Diabody purification.
- the culture supernatant of CH0 cells is applied to a Macro-Prep Ceramic Hydroxyapatite Type I (Bio-Rad) column equilibrated with 20 mM phosphate buffer (pH 6.8), Elution was performed stepwise with a phosphate buffer (pH 6.8).
- the eluted fraction was concentrated using an ultrafiltration membrane, and then subjected to gel filtration chromatography using a HiLoad 26/60 Superdex 200pg column to collect a fraction having a molecular weight of about 70 kD to 40 kD. This fraction was adsorbed to an Anti-Flag M2 Affinity Gel column equilibrated with 50 mM Tris-HCl (pH 7.4), 150 mM NaCl, 0.05% Tween20, and eluted with 100 mM Glycine-HCl (pH 3.5).
- 50 mM Tris-HCl pH 7.4
- 150 mM NaCl 150 mM NaCl
- Tween20 0.05%
- the eluted fraction was immediately neutralized with 1M Tris-HCl (pH 8.0) and subjected to gel filtration chromatography using a HiLoad 26/60 Superdex200pg column.
- 1M Tris-HCl pH 8.0
- gel filtration chromatography As a buffer for gel filtration chromatography, 20 mM acetic acid (pH 6.0), 150 mM NaCl, and 0.01% Tween 80 were used.
- FIGS. 3 and 4 show the results of evaluation of TPO-like agonist activity using BaF3-monkey Mpl.
- single-chain antibodies (Diabody, sc (Fv) 2) of VB16, VB140, VB45B, and TA136 were expressed on COS7, and TPO-like agonist activity on BaF3-human Mpl was determined using the culture supernatant.
- the evaluation results are shown in Figs. 5, 6, 7, and 8, respectively.
- Table 50 is shown in Table 1.
- the optimal linker length is considered to depend on each antibody.
- the linker length is as short as 5-12mer, non-covalent diabody is formed, but when the linker length is longer (12mer or longer), scFv-mer is formed without diabody formation.
- scFv-mer is formed without diabody formation.
- the full-length antibody can be activated by reducing the molecular weight, specifically, to a diabody or sc (Fv) 2. Can be raised.
- the activity of a full-length antibody has been weak in the past, it has been difficult to develop it as a drug or the like.
- various types of expression systems such as animal cells, yeast, and E. coli can be used even when recombinants are produced, which is highly convenient. Become.
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EP04820305A EP1710308A4 (en) | 2003-12-12 | 2004-12-10 | METHOD FOR ENHANCING THE ACTIVITY OF ANTIBODY |
CA002548950A CA2548950A1 (en) | 2003-12-12 | 2004-12-10 | Methods for enhancing antibody activity |
AU2004296336A AU2004296336B2 (en) | 2003-12-12 | 2004-12-10 | Methods for enhancing antibody activity |
JP2005516194A JP4634305B2 (ja) | 2003-12-12 | 2004-12-10 | 抗体の活性を増強させる方法 |
US10/582,413 US20080009038A1 (en) | 2003-12-12 | 2004-12-10 | Methods for Enhancing Antibody Activity |
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- 2004-12-08 TW TW093137900A patent/TW200530266A/zh not_active IP Right Cessation
- 2004-12-10 EP EP04820305A patent/EP1710308A4/en not_active Withdrawn
- 2004-12-10 JP JP2005516194A patent/JP4634305B2/ja not_active Expired - Fee Related
- 2004-12-10 KR KR1020067013908A patent/KR20060130605A/ko not_active Application Discontinuation
- 2004-12-10 CA CA002548950A patent/CA2548950A1/en not_active Abandoned
- 2004-12-10 WO PCT/JP2004/018493 patent/WO2005056798A1/ja active Application Filing
- 2004-12-10 CN CNA2004800415998A patent/CN1918295A/zh active Pending
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Cited By (7)
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US7993642B2 (en) | 2003-12-12 | 2011-08-09 | Chugai Seiyaku Kabushiki Kaisha | Anti-MPL antibodies |
US8008073B2 (en) | 2003-12-12 | 2011-08-30 | Chugai Seiyaku Kabushiki Kaisha | Anti-Mpl antibodies |
WO2005107784A1 (ja) * | 2004-05-11 | 2005-11-17 | Chugai Seiyaku Kabushiki Kaisha | 血小板減少症治療剤 |
US9493569B2 (en) | 2005-03-31 | 2016-11-15 | Chugai Seiyaku Kabushiki Kaisha | Structural isomers of sc(Fv)2 |
US8945543B2 (en) | 2005-06-10 | 2015-02-03 | Chugai Seiyaku Kabushiki Kaisha | Stabilizer for protein preparation comprising meglumine and use thereof |
US9241994B2 (en) | 2005-06-10 | 2016-01-26 | Chugai Seiyaku Kabushiki Kaisha | Pharmaceutical compositions containing sc(Fv)2 |
US9777066B2 (en) | 2005-06-10 | 2017-10-03 | Chugai Seiyaku Kabushiki Kaisha | Pharmaceutical compositions containing sc(Fv)2 |
Also Published As
Publication number | Publication date |
---|---|
CA2548950A1 (en) | 2005-06-23 |
TW200530266A (en) | 2005-09-16 |
AU2004296336A1 (en) | 2005-06-23 |
CN1918295A (zh) | 2007-02-21 |
US20080009038A1 (en) | 2008-01-10 |
AU2004296336B2 (en) | 2011-09-08 |
EP1710308A4 (en) | 2008-11-19 |
KR20060130605A (ko) | 2006-12-19 |
TWI347950B (ja) | 2011-09-01 |
EP1710308A1 (en) | 2006-10-11 |
JPWO2005056798A1 (ja) | 2007-12-06 |
JP4634305B2 (ja) | 2011-02-16 |
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