WO2013147213A1 - CDR改変抗Siglec-15抗体 - Google Patents
CDR改変抗Siglec-15抗体 Download PDFInfo
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- WO2013147213A1 WO2013147213A1 PCT/JP2013/059654 JP2013059654W WO2013147213A1 WO 2013147213 A1 WO2013147213 A1 WO 2013147213A1 JP 2013059654 W JP2013059654 W JP 2013059654W WO 2013147213 A1 WO2013147213 A1 WO 2013147213A1
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- 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
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- C07K2317/92—Affinity (KD), association rate (Ka), dissociation rate (Kd) or EC50 value
Definitions
- the present invention relates to a substance useful as a therapeutic and / or preventive agent for abnormal bone metabolism and a method for treating and / or preventing abnormal bone metabolism.
- Bone is known as a dynamic organ that reconstructs by constantly repeating formation and resorption in order to maintain its own morphological changes and blood calcium concentration.
- bone formation by osteoblasts and bone resorption by osteoclasts are in an equilibrium relationship, and the bone mass is kept constant.
- bone metabolism abnormalities such as osteoporosis occur (see, for example, Non-Patent Documents 1 and 2).
- Non-Patent Document 1 and 3 A number of systemic hormones and local cytokines have been reported as factors that regulate bone metabolism, and the formation and maintenance of bone is carried out by the joint action of these factors (for example, Non-Patent Document 1 and 3).
- the development of osteoporosis is widely known as a change in bone tissue due to aging, but the mechanism of its onset is decreased secretion of sex hormones and receptor abnormalities, fluctuations in cytokine expression in bone, aging gene expression, osteoclast It is difficult to understand as a simple physiological phenomenon due to aging due to a variety of cells and osteoblast differentiation and dysfunction.
- Primary osteoporosis is roughly classified into postmenopausal osteoporosis due to decreased estrogen secretion and senile osteoporosis due to aging. In order to elucidate the onset mechanism and develop therapeutic agents, the regulation mechanism of bone resorption and bone formation Progress in basic research is essential.
- Osteoclasts are multinucleated cells derived from hematopoietic stem cells that release the chloride and hydrogen ions on the bone-adherent surface, thereby acidifying the gap between the cell-bone adhesive surface and being an acidic protease.
- Cathepsin K etc. are secreted (for example, refer nonpatent literature 4).
- decomposition of calcium phosphate, activation of acidic protease and decomposition of bone matrix protein are caused, and bone resorption proceeds.
- osteoclast progenitor cells differentiate into osteoclasts upon stimulation with RANKL (Receptor activator of NF- ⁇ B ligand) expressed on the cell membrane of osteoblasts / stromal cells on the bone surface.
- RANKL Receptor activator of NF- ⁇ B ligand
- RANKL is a membrane protein produced by osteoblasts / stromal cells, its expression is regulated by bone resorption factors, and RANKL induces differentiation from osteoclast precursor cells to mature multinucleated osteoclasts, etc.
- mice knocked out of RANKL develop a pathological condition like marble bone disease, and it was proved that RANKL is a physiological osteoclast differentiation inducing factor (see, for example, Non-Patent Document 8). reference).
- bisphosphonates As pharmaceuticals for treating bone metabolic diseases and shortening the treatment period, bisphosphonates, active vitamin D 3 , calcitonin and derivatives thereof, hormones such as estradiol, SERMs (Selective estogen receptor modulators), ipriflavone, vitamin K 2 (menatetrenone), PTH and calcium preparations are used.
- hormones such as estradiol, SERMs (Selective estogen receptor modulators), ipriflavone, vitamin K 2 (menatetrenone), PTH and calcium preparations.
- Sialic acid-binding immunoglobulin-like lectins Sialic-acid-binding immunoglobulin-like lectins, hereinafter referred to as “Siglecs”) are a family of type I membrane proteins that recognize and bind sialic acid-containing sugar chains.
- Siglecs are abundantly expressed on the cell membrane of immune system cells, and also recognize sialic acid present on the cell membrane of immune system cells and regulate cell-cell interactions and cell functions, and are involved in immune responses There are many Siglecs molecules that have been considered (see, for example, Non-Patent Document 9), but whose physiological functions are not clear.
- Siglec-15 Sialic-acid binding immunoglobulin-like electin 15
- CD33L3 CD33 molecule-like 3 Is the same.
- Patent Document 1 discloses an antibody that suppresses osteoclast differentiation, but the search for an antibody that exhibits a more potent action is continued.
- An object of the present invention is to provide a gene that is specifically expressed in various bone metabolism abnormalities found in osteoporosis, rheumatoid arthritis, cancer bone metastasis, and the like, a substance that inhibits differentiation and maturation and activity of osteoclasts, and bone metabolism
- the object is to provide an agent for the treatment and / or prevention of abnormalities.
- the present invention includes the following inventions.
- the heavy chain sequence includes a variable region having CDRH1, CDRH2, and CDRH3, the CDRH1 is composed of an amino acid sequence represented by SEQ ID NO: 7, the CDRH2 is composed of an amino acid sequence represented by SEQ ID NO: 9, and the CDRH3 Consists of the amino acid sequence shown in SEQ ID NO: 11; and the light chain sequence comprises a variable region having CDRL1, CDRL2, CDRL3, said CDRL1 consists of the amino acid sequence shown in SEQ ID NO: 12, and said CDRL2 is SEQ ID NO: 13 consisting of the amino acid sequence shown in FIG. 13, wherein the CDRL3 consists of the amino acid sequence shown in SEQ ID NO: 14; Or an antigen-binding fragment of the antibody.
- a heavy chain variable region sequence consisting of amino acid residues 20 to 140 of the amino acid sequence shown in SEQ ID NO: 6 and a light chain variable consisting of amino acid residues 21 to 133 of the amino acid sequence shown in SEQ ID NO: 4 The antibody or antigen-binding fragment of the antibody according to (1), comprising a region sequence.
- It consists of a heavy chain sequence consisting of amino acid residues 20 to 466 of the amino acid sequence shown in SEQ ID NO: 6 and a light chain sequence consisting of amino acid residues 21 to 238 of the amino acid sequence shown in SEQ ID NO: 4.
- the antibody or antigen-binding fragment of the antibody according to (1) (4) It consists of a heavy chain sequence consisting of amino acid residues 20 to 465 of the amino acid sequence shown in SEQ ID NO: 6 and a light chain sequence consisting of amino acid residues 21 to 238 of the amino acid sequence shown in SEQ ID NO: 4.
- the antibody or antigen-binding fragment of the antibody according to (1) (5)
- the antigen-binding fragment of the antibody according to (1) or (2) which is selected from the group consisting of Fab, F (ab ′) 2, Fab ′ and Fv. (6)
- the antibody according to (1) or (2), which is scFv. (7) A pharmaceutical composition comprising at least one of the antibody or antigen-binding fragment of the antibody according to (1) to (6).
- the pharmaceutical composition according to (7) which is a therapeutic and / or preventive agent for abnormal bone metabolism.
- Bone metabolism abnormality is caused by osteoporosis, bone destruction associated with rheumatoid arthritis, cancerous hypercalcemia, bone destruction associated with multiple myeloma or cancer bone metastasis, giant cell tumor, osteopenia, periodontitis (8) or (9) selected from the group consisting of tooth loss, osteolysis around an artificial joint, bone destruction in chronic osteomyelitis, Paget's disease of bone, renal osteodystrophy, and osteogenesis imperfecta
- the pharmaceutical composition according to (10), wherein the bone metabolism abnormality is osteoporosis, bone destruction associated with rheumatoid arthritis, or bone destruction associated with cancer bone metastasis.
- the osteoporosis is postmenopausal osteoporosis, senile osteoporosis, secondary osteoporosis due to the use of therapeutic agents such as steroids and immunosuppressive agents, or osteoporosis associated with rheumatoid arthritis (12) Pharmaceutical composition.
- At least one of the antibody described in (1) to (6), the antigen-binding fragment of the antibody, or the pharmaceutical composition described in (8) or (9) is administered. A method for treating and / or preventing abnormal bone metabolism.
- hormones such as
- a method for treating and / or preventing abnormal bone metabolism (16) The treatment and / or prevention method according to (14) or (15), wherein the bone metabolism abnormality is osteoporosis, bone destruction accompanying rheumatoid arthritis, or bone destruction accompanying bone metastasis of cancer. (17) The treatment and / or prevention method according to (16), wherein the bone metabolism abnormality is osteoporosis. (18) The osteoporosis is postmenopausal osteoporosis, senile osteoporosis, secondary osteoporosis due to the use of a therapeutic agent such as a steroid or an immunosuppressant, or osteoporosis associated with rheumatoid arthritis (17) Treatment and / or prevention methods.
- the polynucleotide according to (19) comprising: (21) a polynucleotide comprising a nucleotide sequence comprising nucleotides 58 to 1398 of the nucleotide sequence represented by SEQ ID NO: 5 and a polynucleotide comprising a nucleotide sequence comprising nucleotides 61 to 714 of the nucleotide sequence represented by SEQ ID NO: 3
- a transformed host cell comprising any one of the polynucleotides according to (19) to (21).
- a transformed host cell comprising the vector according to (22).
- the method for producing an antibody according to any one of (1) to (6), comprising culturing the host cell according to (23) or (24) and purifying the antibody from the culture product.
- a therapeutic and / or prophylactic agent for abnormal bone metabolism which has an action mechanism of osteoclast differentiation and maturation and inhibition of bone resorption activity.
- FIG. 3 shows the amino acid sequences of CDRs of # 32A1 antibody and K3-1115 / T103E antibody.
- the term “gene” includes not only DNA but also mRNA, cDNA, and cRNA.
- polynucleotide is used in the same meaning as a nucleic acid, and includes DNA, RNA, probes, oligonucleotides, and primers.
- polypeptide and “protein” are used without distinction.
- RNA fraction refers to a fraction containing RNA.
- cell includes cells in an individual animal and cultured cells.
- Siglec-15 is used in the same meaning as Siglec-15 protein.
- osteoclast formation is used in the same meaning as “osteoclast differentiation” or “osteoclast maturation”.
- antigen-binding fragment of an antibody is also referred to as “functional fragment of an antibody” and means a partial fragment of an antibody having binding activity to an antigen.
- Fab ' which is a monovalent fragment of the variable region of an antibody obtained by treating F (ab') 2 under reducing conditions, is also included in the antigen-binding fragment of an antibody.
- the molecule is not limited to these molecules as long as it has the ability to bind to an antigen.
- These antigen-binding fragments include not only those obtained by treating full-length antibody protein molecules with appropriate enzymes, but also proteins produced in appropriate host cells using genetically engineered antibody genes. It is.
- CDRs complementarity determining regions
- the complementarity-determining region is also called a hypervariable domain, and is located in the variable region of the heavy and light chains of the antibody and has a particularly high primary structure variability.
- the polypeptide chains are separated at three locations on the primary structure of the polypeptide chain.
- the complementarity determining region of an antibody is expressed as CDRH1, CDRH2, CDRH3 from the amino terminal side of the heavy chain amino acid sequence, and the complementarity determining region of the light chain is lightly expressed.
- CDRL1, CDRL2, and CDRL3 are represented from the amino terminal side of the chain amino acid sequence. These sites are close to each other on the three-dimensional structure and determine the specificity for the antigen to be bound.
- hybridize under stringent conditions means to hybridize at 68 ° C. in a commercially available hybridization solution ExpressHyb Hybridization Solution (manufactured by Clontech) or use a filter on which DNA is fixed. After hybridization at 68 ° C in the presence of 0.7-1.0 M NaCl, 0.1-2 fold SSC solution (1 fold SSC consists of 150 mM NaCl, 15 mM sodium citrate) ) And hybridization under conditions that can be identified by washing at 68 ° C. or equivalent conditions.
- Siglec-15 The inventors have found that the Siglec-15 gene is specifically expressed in giant cell tumors. The present inventors have also found that the expression level of the Siglec-15 gene increases when the monocyte-derived cell line differentiates into osteoclasts.
- Siglec-15 used in the present invention is directly purified from human, non-human mammals (eg, guinea pig, rat, mouse, rabbit, pig, sheep, cow, monkey, etc.) or chicken monocyte cells or bone marrow cells. It can be used, or it can be used by preparing a cell membrane fraction of the above-mentioned cells, or by synthesizing Siglec-15 in vitro or producing it in a host cell by genetic manipulation. .
- Siglec-15 cDNA is incorporated into an expressible vector and then synthesized in a solution containing enzymes, substrates and energy substances necessary for transcription and translation, or other prokaryotic organisms, or The protein can be obtained by expressing Siglec-15 by transforming a eukaryotic host cell.
- Siglec-15 The nucleotide sequence of human Siglec-15 cDNA is registered in GenBank with accession number: NM_213602.
- the nucleotide sequence of mouse Siglec-15 cDNA is registered with GenBank under the accession number: XM — 844636.
- Siglec-15 is sometimes called CD33 antigen-like 3, CD33 molecular-like 3, CD33-like 3, or CD33L3, and these all indicate the same molecule.
- the Siglec-15 cDNA is, for example, a polymerase chain reaction (hereinafter referred to as “PCR”) using a cDNA library expressing the Siglec-15 cDNA as a template and a primer that specifically amplifies the Siglec-15 cDNA.
- PCR polymerase chain reaction
- a polynucleotide comprising a nucleotide sequence complementary to a nucleotide sequence encoding human or mouse Sigle-15 under stringent conditions and encodes a protein having biological activity equivalent to that of Siglec-15.
- Polynucleotides are also included in the Siglec-15 cDNA.
- a splicing variant transcribed from the human or mouse Siglec-15 gene locus or a polynucleotide that hybridizes to this under stringent conditions, and that encodes a protein having a biological activity equivalent to Siglec-15 Nucleotides are also included in the Siglec-15 cDNA.
- amino acid sequence of human or mouse Siglec-15 or an amino acid sequence obtained by subtracting, deleting, or adding one or several amino acids from the amino acid sequence obtained by removing the signal sequence from these sequences. Proteins having biological activity equivalent to ⁇ 15 are also included in Siglec-15. And an amino acid sequence encoded by a splicing variant transcribed from the human or mouse Siglec-15 gene locus, or an amino acid sequence in which one or several amino acids are substituted, deleted, or added, and A protein having biological activity equivalent to that of Siglec-15 is also included in Siglec-15.
- the Siglec-15 gene is a bone tumor in which many osteoclast-like multinucleated giant cells appear when the expression level of the gene in various bone tissue specimens is analyzed. Characterized by sexual bone destruction (Bullough et al., Atlas of Orthopedic Pathology 2nd edition, pp 17.6-17.8, Lippincott Williams & Wilkins Publishers (c) 1994) It was found that the expression level increased.
- Siglec-15 is considered to be involved in human pathological conditions such as GCT where bone resorption is enhanced. That is, by measuring the expression level in each cell and / or each tissue of the Siglec-15 gene and / or Siglec-15, the state of abnormal bone metabolism accompanied by overexpression of Siglec-15 can be determined.
- abnormal bone metabolism is a disorder characterized by net bone loss.
- osteoporosis postmenopausal osteoporosis, senile osteoporosis, use of therapeutic drugs such as steroids and immunosuppressive agents
- Secondary osteoporosis osteoporosis associated with rheumatoid arthritis
- bone destruction associated with rheumatoid arthritis cancerous hypercalcemia
- bone destruction associated with multiple myeloma and cancer bone metastasis giant cell tumor
- osteopenia periodontal ligament
- examples include, but are not limited to, tooth loss due to inflammation, osteolysis around artificial joints, bone destruction in chronic osteomyelitis, Paget's disease of bone, renal osteodystrophy, osteogenesis imperfecta and the like.
- the “specimen” to be examined for the expression level of the Siglec-15 gene and / or Siglec-15 refers to bone marrow, bone, prostate, testis, penis, bladder, kidney obtained from a subject or clinical specimen.
- a tissue such as a node, muscle, adipose tissue, blood, body fluid or excrement, but in the present invention, blood or bone marrow is more preferable.
- RANKL which is known to be related to osteoclast differentiation
- knockout mice have been prepared, and the phenotype when RANKL function is lost has been analyzed (Young-Yung Kong, et. Al., Nature (1999) 397, p. 315-323).
- Siglec-15 By producing a knockout mouse for Siglec-15, it is possible to analyze the phenotype when the function of Siglec-15 is lost.
- the antibody against Siglec-15 of the present invention is immunized in vivo using a conventional method to immunize animals with any polypeptide selected from the amino acid sequence of Siglec-15 or Siglec-15. It can be obtained by collecting and purifying the produced antibody.
- the species of Sigle-15 used as an antigen is not limited to humans, and Siglec-15 derived from animals other than humans such as mice and rats can also be used to immunize animals.
- an antibody applicable to a human disease can be selected by examining the cross-reactivity between the obtained antibody that binds to different types of Siglec-15 and human Siglec-15.
- a hybridoma can be established by fusing an antibody-producing cell producing an antibody against Siglec-15 with a myeloma cell to obtain a monoclonal antibody.
- Specific examples of such a method are described in International Publication No. WO 09/48072 pamphlet (published on April 16, 2009) and WO 10/117011 pamphlet (published on October 14, 2010).
- Sigle-15 as an antigen can be obtained by producing a Siglec-15 gene in a host cell by genetic manipulation. Specifically, a vector capable of expressing the Siglec-15 gene is prepared, introduced into a host cell, the gene is expressed, and the expressed Siglec-15 is purified.
- hybridoma strains established in this way include the hybridoma # 32A1 described in International Publication WO09 / 48072.
- Hybridoma # 32A1 is dated August 28, 2008 at the Patent Organism Depositary, National Institute of Advanced Industrial Science and Technology (location: postal code 305-8565, 1-1-1 Higashi 1-chome, Tsukuba, Ibaraki, Japan) The deposit number is FERM BP-10999 under the name of anti-Siglec-15 Hybridoma # 32A1.
- an antibody produced by hybridoma # 32A1 is referred to as “# 32A1 antibody” or simply “# 32A1”.
- a partial fragment containing the heavy chain variable region or the light chain variable region of the # 32A1 antibody is described in International Publication No. WO2010 / 11701.
- a humanized antibody which is a recombinant antibody, can be prepared by artificially modifying the sequence of the monoclonal antibody against Siglec-15 for the purpose of reducing the heterologous antigenicity with respect to humans.
- the antibody of the present invention includes an antibody obtained by modifying the CDR of the humanized antibody. These antibodies can be produced using known methods.
- a humanized antibody an antibody in which only a complementarity determining region (CDR; complementarity determining region) is incorporated into a human-derived antibody (see Nature (1986) 321, p.522-525), a CDR sequence is obtained by CDR grafting.
- CDR complementarity determining region
- an antibody International Publication No. WO90 / 07861 in which amino acid residues of some frameworks are grafted to a human antibody can be mentioned.
- Examples of a humanized antibody of rat antibody # 32A1 include a heavy chain comprising a heavy chain variable region consisting of an amino acid sequence consisting of amino acid residues 20 to 140 of SEQ ID NO: 2, and 21st to 133rd of SEQ ID NO: 4. The combination of the light chain containing the light chain variable region which consists of an amino acid sequence which consists of an amino acid residue can be mentioned.
- antibodies include a heavy chain having an amino acid sequence consisting of amino acid residues 20 to 466 of SEQ ID NO: 2 and a light chain having an amino acid sequence consisting of amino acid residues 21 to 238 of SEQ ID NO: 4. Mention may be made of antibodies. In the present specification, the antibody is referred to as “K3-1115” or “K3-1115 antibody”.
- the heavy chain variable region of antibody # 32A1 consists of CDRH1 (DYFMN) consisting of the amino acid sequence shown in SEQ ID NO: 7, CDRH2 (QIRNKIYTYATYAYASLEG) consisting of the amino acid sequence shown in SEQ ID NO: 8, or CDRH2 shown in SEQ ID NO: 9 ( One of QIRNKYYTYTFYA) and CDRH3 (SLTGGGDYFDY) consisting of the amino acid sequence shown in SEQ ID NO: 10.
- CDRH2 shown in SEQ ID NO: 8 is based on the definition of Kabat (SEQUENCES OF PROTEINS OF IMMUNOLOGICAL INTEREST VOL.I, FIFTH EDION (1991)).
- CDRH2 shown in SEQ ID NO: 9 the C-terminus is shortened by 5 residues from the Kabat definition.
- this heavy chain sequence containing CDRH2 since the CDR sequence derived from rat is reduced and more human framework sequences are incorporated, it is more difficult to be recognized as a heterologous antigen when administered to humans.
- the light chain variable region of the # 32A1 antibody consists of CDRL1 (RASQSVTGISGFIH) consisting of the amino acid sequence shown in SEQ ID NO: 12, CDRL2 (RASNLAS) consisting of the amino acid sequence shown in SEQ ID NO: 13, and amino acids shown in SEQ ID NO: 14. It has CDRL3 (QQSRKSPWT) consisting of the sequence.
- CDRL1 RASQSVTGISGFIH
- RASNLAS RASNLAS
- QQSRKSPWT amino acid sequences of the CDRs of SEQ ID NOs: 7 to 10 and 12 to 14 are also shown in FIG.
- CDR variant of a humanized antibody derived from antibody # 32A1 is an antibody in which the third threonine residue of CDRH3 of SEQ ID NO: 10 is substituted with a glutamic acid residue.
- Siglec-15 is a basic protein, and it is expected that by introducing acidic amino acid residues such as aspartic acid and glutamic acid into the antibody sequence, an ionic bond between the antigen and the antibody is formed and the binding ability is expected to be improved. .
- CDRH3 (SLEGGGDYFDY) having the above-described substitution corresponds to the amino acid sequence of SEQ ID NO: 11 in the Sequence Listing.
- the amino acid sequence of CDRH3 of SEQ ID NO: 11 is also shown in FIG.
- a heavy chain comprising a heavy chain variable region consisting of an amino acid sequence consisting of amino acid residues 20 to 140 of SEQ ID NO: 6, and amino acids 21 to 133 of SEQ ID NO: 4
- the combination of the light chain containing the light chain variable region which consists of an amino acid sequence which consists of a residue can be mentioned.
- Further preferred antibodies include a heavy chain having an amino acid sequence consisting of amino acid residues 20 to 466 of SEQ ID NO: 6 and a light chain having an amino acid sequence consisting of amino acid residues 21 to 238 of SEQ ID NO: 4. Mention may be made of antibodies.
- the antibody is referred to as “K3-1115 / T103E” or “K3-1115 / T103E antibody”.
- the K3-1115 / T103E antibody heavy chain is a sequence obtained by substituting the glutamic acid residue for the 103rd threonine residue in the amino acid sequence obtained by removing the signal sequence from the K3-1115 heavy chain sequence shown in SEQ ID NO: 2. .
- the CDR variant of humanized # 32A1 of the present invention is not limited to the above CDR variant as long as it retains the CDRH3 sequence of SEQ ID NO: 11.
- the CDRH2 sequence of the CDR variant of humanized # 32A1 of the present invention may be either CDRH2 shown in SEQ ID NO: 8 or SEQ ID NO: 9.
- the present invention includes antibodies having such modifications, including deletions in which one or two amino acids have been deleted at the heavy chain carboxyl terminus, and the amidated deletions (for example, at the carboxyl terminal site).
- Heavy chain in which a proline residue is amidated is not limited to the above type.
- the two heavy chains constituting the antibody according to the present invention may be either one of the full length and the heavy chain selected from the group consisting of the above-mentioned deletion forms, or a combination of any two of them. It may be a thing.
- the amount ratio of each deletion can be influenced by the type and culture conditions of cultured mammalian cells producing the antibody according to the present invention, but the main component of the antibody according to the present invention is the carboxyl in both of the two heavy chains. A case where one terminal amino acid residue is deleted can be mentioned.
- the antibody obtained by the above method can be evaluated for binding to the antigen by the method shown in Example 3 or the like, and a suitable antibody can be selected.
- An example of another index for comparing antibody properties is antibody stability.
- Differential scanning calorimetry (DSC) is a method that can quickly and accurately measure the thermal denaturation midpoint (Tm), which is an indicator of good relative structural stability of proteins.
- Tm thermal denaturation midpoint
- the difference in thermal stability can be compared by measuring the Tm value using DSC and comparing the values. It is known that the storage stability of an antibody shows a certain degree of correlation with the thermal stability of the antibody (Lori Burton, et. Al., Pharmaceutical Development and Technology (2007) 12, p.265-273), and heat.
- a suitable antibody can be selected using stability as an index.
- Other indicators for selecting antibodies include high yields in suitable host cells and low aggregation in aqueous solutions. For example, since the antibody with the highest yield does not necessarily exhibit the highest thermal stability, it is necessary to select the most suitable antibody for human administration based on a comprehensive judgment based on the above-mentioned indicators. .
- the antibody of the present invention may be an antibody having a single heavy chain variable region and no light chain sequence.
- Such an antibody is called a single domain antibody (sdAb) or nanobody, and is actually observed in a camel or llama and reported to retain antigen-binding ability.
- sdAb single domain antibody
- nanobody single domain antibody
- the above antibody can also be interpreted as a kind of antigen-binding fragment of the antibody in the present invention.
- WO99 / 54342, WO00 / 61739, WO02 / 31140, and the like are known as regulation techniques for antibody sugar chain modification, but are not limited thereto.
- an antibody gene When an antibody gene is once isolated and then introduced into an appropriate host to produce an antibody, a combination of an appropriate host and an expression vector can be used.
- Specific examples of the antibody gene include a combination of a gene encoding the heavy chain sequence of the antibody described in the present specification and a gene encoding the light chain sequence.
- the heavy chain sequence gene and the light chain sequence gene When transforming a host cell, the heavy chain sequence gene and the light chain sequence gene can be inserted into the same expression vector, or can be inserted into separate expression vectors. is there.
- eukaryotic cells When eukaryotic cells are used as hosts, animal cells, plant cells, and eukaryotic microorganisms can be used. Examples of animal cells include (1) mammalian cells such as COS cells (Gluzman, Y. Cell (1981) 23, p.
- ATCC CRL-1650 which are monkey cells, mouse fibroblasts NIH3T3 (ATCC). No. CRL-1658) and Chinese hamster ovary cells (CHO cells, ATCC CCL-61) dihydrofolate reductase-deficient strains (Urlauub, G. and Chasin, LA Proc. Natl. Acad. Sci. U.). S. A. (1980) 77, p. 4126-4220).
- Escherichia coli and Bacillus subtilis can be mentioned, for example.
- An antibody can be obtained by introducing a desired antibody gene into these cells by transformation, and culturing the transformed cells in vitro. In the above culture method, the yield may vary depending on the sequence of the antibody. From the antibodies having equivalent binding activity, those that can be easily produced as pharmaceuticals can be selected using the yield as an index.
- IgG IgG1, IgG2, IgG3, IgG4
- IgM IgA (IgA1, IgA2)
- IgD or IgE preferably IgG or IgM
- IgG1 or IgG2 More preferably, IgG1 or IgG2 can be mentioned.
- the antibody of the present invention may be an antigen-binding fragment of an antibody having an antigen-binding portion of the antibody or a modified product thereof.
- a fragment of the antibody can be obtained by treating the antibody with a proteolytic enzyme such as papain or pepsin, or modifying the antibody gene by a genetic engineering technique and expressing it in an appropriate cultured cell.
- a fragment that retains all or part of the functions of the full-length antibody molecule can be referred to as an antigen-binding fragment of an antibody.
- Antibody functions generally include antigen-binding activity, activity that neutralizes antigen activity, activity that enhances antigen activity, antibody-dependent cytotoxic activity, complement-dependent cytotoxic activity, and complement-dependence Mention may be made of cellular cytotoxic activity.
- the function of the antigen-binding fragment of the antibody in the present invention is the binding activity to Siglec-15, preferably the activity of suppressing the formation of osteoclasts, more preferably the process of cell fusion of osteoclasts. Activity.
- antibody fragments include Fab, F (ab ′) 2, Fv, or single chain Fv (scFv), diabodies (diabodies), linear antibody in which Fvs of heavy and light chains are linked by an appropriate linker.
- Fab ' which is a monovalent fragment of the variable region of an antibody obtained by treating F (ab') 2 under reducing conditions, is also included in the antibody fragment.
- the antibody of the present invention may be a multispecific antibody having specificity for at least two different antigens.
- a molecule binds to two types of antigens (ie, bispecific antibodies), but the “multispecific antibody” in the present invention is more than that (for example, three types). It includes an antibody having specificity for the antigens.
- the multispecific antibody of the present invention may be a full-length antibody or a fragment of such an antibody (for example, F (ab ') 2 bispecific antibody).
- Bispecific antibodies can be prepared by combining the heavy and light chains (HL pairs) of two types of antibodies, or by hybridizing hybridomas that produce different monoclonal antibodies to produce a bispecific antibody. It can also be produced by producing cells (Millstein et al., Nature (1983) 305, p. 537-539).
- the antibody of the present invention may be a single chain antibody (also referred to as scFv).
- a single-chain antibody is obtained by linking an antibody heavy chain variable region and light chain variable region with a polypeptide linker (Pluckthun, The Pharmacology of Monoclonal Antibodies, 113 (Rosenberg and Moore, edited by Springer Verlag, New). York, p. 269-315 (1994), Nature Biotechnology (2005), 23, p. 1126-1136)
- a BiscFv fragment produced by linking two scFvs with a polypeptide linker is used as a bispecific antibody. It can also be used.
- the heavy chain variable region and the light chain variable region are linked via a linker that does not form a conjugate, preferably a polypeptide linker (Huston, JS et al., Proc. Natl. Acad. Sci.U.S.A. (1988), 85, p.5879-5883).
- the heavy chain variable region and the light chain variable region in scFv may be derived from the same antibody or different antibodies.
- the polypeptide linker that links the variable regions for example, any single chain peptide consisting of 12 to 19 residues is used.
- the scFv-encoding DNA is a DNA encoding the heavy chain or heavy chain variable region of the antibody, and a DNA encoding the light chain or light chain variable region.
- an expression vector containing them and a host transformed with the expression vector can be obtained in accordance with a conventional method.
- ScFv can be obtained according to the method.
- These antibody fragments can be produced by a host after obtaining and expressing the gene in the same manner as described above.
- the antibody of the present invention may be one that has been increased in quantity and has increased affinity for the antigen.
- the antibody that multiplies may be one type of antibody or a plurality of antibodies that recognize multiple epitopes of the same antigen. Examples of the method for increasing the number of antibodies include binding of IgG CH3 domain and two scFvs, binding to streptavidin, introduction of helix-turn-helix motif, and the like.
- the antibody of the present invention may be a polyclonal antibody that is a mixture of a plurality of types of anti-Siglec-15 antibodies having different amino acid sequences.
- a polyclonal antibody a mixture of plural kinds of antibodies having different CDRs can be mentioned.
- a polyclonal antibody a mixture of cells producing different antibodies can be cultured, and an antibody purified from the culture can be used (see WO 2004/061104).
- an antibody conjugated with various molecules such as polyethylene glycol (PEG) can also be used.
- PEG polyethylene glycol
- the antibody of the present invention may be one in which these antibody and another drug form a conjugate (Immunoconjugate).
- conjugate examples include those in which the antibody is bound to a radioactive substance or a compound having a pharmacological action (Nature Biotechnology (2005) 23, p. 1137-1146).
- the obtained antibody can be purified to homogeneity. Separation and purification of antibodies may be carried out using separation and purification methods used for ordinary proteins. For example, antibodies can be separated and purified by appropriately selecting and combining column chromatography, filter filtration, ultrafiltration, salting out, dialysis, preparative polyacrylamide gel electrophoresis, isoelectric focusing, etc. (Stratesies) for Protein Purification and Characterization: A Laboratory Course Manual, Daniel R.Marshak et al.eds, Cold Spring Harbor Laboratory Press (1996); Antibodies:. A Laboratory Manual.Ed Harlow and David Lane, Cold Spring Harbor Laboratory ( 988)) it is not intended to be limited thereto.
- chromatography examples include affinity chromatography, ion exchange chromatography, hydrophobic chromatography, gel filtration chromatography, reverse phase chromatography, and adsorption chromatography. These chromatography can be performed using liquid chromatography, such as HPLC and FPLC.
- column used for affinity chromatography include a protein A column and a protein G column.
- a column using a protein A column Hyper D, POROS, Sepharose F.R. F. (Pharmacia) and the like. It is also possible to purify an antibody using a carrier on which an antigen is immobilized, utilizing the binding property to the antigen.
- Medicament containing anti-Siglec-15 antibody Among the anti-Siglec-15 antibodies obtained by the method described in the above section "3. Production of anti-Siglec-15 antibody", the biological activity of Siglec-15 is neutralized. Antibody can be obtained. These antibodies that neutralize the biological activity of Siglec-15 inhibit the biological activity of Siglec-15 in vivo, that is, the differentiation and / or maturation of osteoclasts. And / or can be used as a therapeutic and / or prophylactic agent for abnormal bone metabolism caused by abnormal maturation. An abnormal bone metabolism may be any disorder characterized by net bone loss (osteopenia or osteolysis). In general, treatment and / or prevention with anti-Siglec-15 antibody is applied when bone resorption needs to be suppressed.
- Bone metabolism disorders that can be treated and / or prevented with anti-Siglec-15 antibodies include osteoporosis (postmenopausal osteoporosis, senile osteoporosis, secondary osteoporosis due to the use of therapeutic agents such as steroids and immunosuppressants, and rheumatoid arthritis Osteoporosis), bone destruction associated with rheumatoid arthritis, cancerous hypercalcemia, bone destruction associated with multiple myeloma and cancer bone metastasis, giant cell tumor, osteopenia, periodontitis, tooth loss, periarticular joint Bone osteolysis, bone destruction in chronic osteomyelitis, Paget's disease of bone, renal osteodystrophy, osteogenesis imperfecta, etc., but if the disease involves net bone loss due to osteoclasts, It is not limited to these.
- Examples of the above-mentioned anti-Siglec-15 antibody as a medicament include a humanized antibody prepared from # 32A1 antibody and CDR variants thereof.
- the in vitro neutralizing activity of Siglec-15 biological activity by anti-Siglec-15 antibody can be measured, for example, by the activity of inhibiting differentiation of cells overexpressing Siglec-15 into osteoclasts. For example, adding anti-Siglec-15 antibody at various concentrations to mouse monocyte-derived cell line RAW264.7 cell or RAW264 cell, and measuring the inhibitory activity on differentiation to osteoclast by RANKL or TNF- ⁇ stimulation Can do.
- anti-Siglec-15 antibody can be added to bone marrow-derived primary cultured cells at various concentrations, and the inhibition activity of osteoclast differentiation by RANKL, TNF- ⁇ or activated vitamin D 3 stimulation can be measured. it can.
- anti-Siglec-15 antibody was added to normal human osteoclast precursor cells (Normal Human Natural Osteoblast Precursor Cells, available from Sanko Junyaku, catalog number 2T-110) at various concentrations, and stimulated with RANKL and M-CSF.
- the activity of inhibiting the differentiation into osteoclasts can be measured.
- Such an osteoclast differentiation inhibitory effect can be measured using as an index the inhibition of the tartrate-resistant acid phosphatase (TRAP) activity of osteoclasts.
- the osteoclast differentiation inhibitory effect can be measured using as an index the inhibition of formation of TRAP-positive multinucleated osteoclasts, that is, inhibition of cell fusion of osteoclasts.
- the therapeutic or preventive effect on bone metabolism abnormalities of anti-Siglec-15 antibody using an in vivo experimental animal is, for example, anti-Siglec-15 antibody in osteoporosis model animals or transgenic animals overexpressing Siglec-15 Can be confirmed by measuring the change of osteoclasts.
- the osteoporosis model animal include an ovariectomized rat or an ovariectomized monkey.
- bone resorption markers such as urinary deoxypyridinoline, urinary N-telopeptide of type I collagen (NTX), urinary C-telepeptide of type I collagen (CTX), blood NTX, blood CTX, blood target-resistant acid phosphatase (TRAP5b), blood bone type alkaline phosphatase (BAP), blood osteocalcin (BGP), Procollagen type I C-peptide (P1NP), etc.
- NTX urinary N-telopeptide of type I collagen
- CCTX urinary C-telepeptide of type I collagen
- CTX blood NTX
- CTX blood target-resistant acid phosphatase
- BAP blood bone type alkaline phosphatase
- BGP blood osteocalcin
- P1NP Procollagen type I C-peptide
- the antibody that neutralizes the biological activity of Siglec-15 thus obtained is used as a medicine, particularly for the treatment or prevention of abnormal bone metabolism such as osteoporosis, bone destruction associated with rheumatoid arthritis, bone destruction associated with bone metastasis of cancer, etc. It is useful as a pharmaceutical composition for the purpose of, or as an antibody for immunological diagnosis of such diseases.
- RA rheumatoid arthritis
- RANKL and TNF- ⁇ are considered to be the most important causes of osteoclast induction (differentiation and maturation), activation, and bone destruction in RA (Romas E et al., Bone 30, p340-). 346, 2002).
- the RANKL decoy receptor OCIF / OPG can suppress RANKL-induced osteoclast formation, but not TNF- ⁇ -induced osteoclast formation.
- the anti-Siglec-15 antibody of the present invention effectively suppressed both RANKL-induced osteoclast formation and TNF- ⁇ -induced osteoclast formation. Therefore, the anti-Siglec-15 antibody of the present invention is expected to suppress TNF- ⁇ -induced bone loss and bone destruction in RA and the like more strongly than RANKL blockers (OCIF / OPG, anti-RANKL antibody, etc.).
- RANKL blockers OCIF / OPG, anti-RANKL antibody, etc.
- the anti-Siglec-15 antibody can be administered alone or in combination with at least one other bone disease therapeutic agent for the treatment or prevention of abnormal bone metabolism.
- the anti-Siglec-15 antibody can be administered in combination with a therapeutically effective amount of an anti-bone metabolic disorder therapeutic agent.
- Other therapeutic agents that can be administered in combination with the anti-Siglec-15 antibody include bisphosphonates (eg, alendronate, etidonate, ibandronate, incadronate, pambronate, risedronate, or zoledronate), active vitamin D 3 , calcitonin and its derivatives, estradiol Hormones such as SERMs (Selective estrogen receptor modulators), ipriflavone, vitamin K 2 (menatetrenone), calcium preparations, PTH (parathyroid hormone), non-steroidal anti-inflammatory agents (eg, celecoxib or rofecoNb, rofecoNb receptors, etanerc pt), an anti-TNF ⁇ antibody or an antigen-binding fragment of the antibody (eg, infliximab), an anti-PTHrP (parathyrido hormone-related protein) antibody, or an antigen-binding fragment of the antibody, an IL-1 receptor antagonist (eg, anakinr
- two, three or more types of other therapeutic agents may be administered, and these other therapeutic agents may be of the same formulation. It can be administered simultaneously by encapsulating in.
- Other therapeutic agents and anti-Siglec-15 antibody can also be administered simultaneously by encapsulating them in the same formulation.
- the anti-Siglec-15 antibody and other therapeutic agent can be encapsulated in separate formulations and administered simultaneously.
- the other therapeutic agent and the anti-Siglec-15 antibody can be administered separately one after the other.
- a therapeutic agent containing an anti-Siglec-15 antibody or an antigen-binding fragment of the antibody as an active ingredient is administered, or an anti-Siglec-15 antibody or an antigen-binding fragment of the antibody is effective.
- the protein bone disease therapeutic agent gene and the anti-Siglec-15 antibody gene can be inserted separately or downstream of the same promoter region, and can be inserted into separate or the same vector. Can be introduced.
- any antibody fragment can be applied as long as the recognition of osteoclasts is not completely lost.
- fragments such as Fab, F (ab ′) 2, Fv, etc.
- antibodies and fragments thereof can also be used in the present invention.
- the binding mode of the anti-Siglec-15 antibody or a fragment of the antibody and the bone disease therapeutic agent is described in M.M. C.
- Examples of drug carriers include liposomes and water-soluble polymers. More specifically, these drug carriers are intervened in such a manner that an antibody and a bone disease therapeutic agent are included in a liposome, the mode in which the liposome and the antibody are bound, and the bone disease therapeutic agent is highly water-soluble.
- a mode in which an antibody is bound to a molecule a compound having a molecular weight of about 1000 to 100,000
- a spacer such as an oligopeptide and bound to the water-soluble polymer
- the binding of the antibody (or the fragment) to a drug carrier such as a bone disease therapeutic agent, a liposome and a water-soluble polymer is described in G. T.A.
- the complex of the antibody (or the fragment) and the proteinaceous bone disease therapeutic agent (or the fragment) can be prepared by a method well known to those skilled in the art, in addition to the above method, by genetic engineering.
- the present invention also provides a pharmaceutical composition
- a pharmaceutical composition comprising a therapeutically and / or prophylactically effective amount of an anti-Siglec-15 antibody and a pharmaceutically acceptable diluent, carrier, solubilizer, emulsifier, preservative and / or adjuvant. To do.
- the present invention comprises a therapeutically and / or prophylactically effective amount of an anti-Siglec-15 antibody, a therapeutically and / or prophylactically effective amount of at least one bone disease therapeutic agent, and a pharmaceutically acceptable diluent, carrier, solubilization
- pharmaceutical compositions comprising agents, emulsifiers, preservatives and / or adjuvants.
- bone disease therapeutic agents include bisphosphonates (for example, alendronate, etidronate, ibandronate, incadronate, pamidronate, risedronate, or zoledronate), active vitamin D 3 , calcitonin and derivatives thereof, hormones such as estradiol, SERMs (selectort) , Ipriflavone, vitamin K 2 (menatetrenone), calcium preparations, PTH (parathyroid hormone), non-steroidal anti-inflammatory agents (eg celecoxib or rofecoxib), soluble TNF receptor (eg ethanercept), anti-TNF ⁇ antibody or antigen of said antibody Join A fragment (eg, infliximab), an anti-PTHrP (parathyrido hormone-related protein) antibody or an antigen-binding fragment thereof, an IL-1 receptor antagonist (eg, anakinra), an anti-IL-6 receptor antibody, or an antigen-binding fragment of the antibody (eg, , Tocili
- the substance used in the preparation acceptable in the pharmaceutical composition of the present invention is preferably a substance that is non-toxic to a person who is administered the pharmaceutical composition at a dosage or concentration.
- the pharmaceutical composition of the present invention changes or maintains pH, osmotic pressure, viscosity, transparency, color, isotonicity, sterility, stability, dissolution rate, sustained release rate, absorption rate, and penetration rate. Can be included for the formulation.
- Substances for formulation may include, but are not limited to: amino acids such as glycine, alanine, glutamine, asparagine, arginine or lysine, antibacterial agents, ascorbic acid, sodium sulfate or sodium bisulfite Antioxidants, phosphoric acid, citric acid, boric acid buffer, sodium bicarbonate, buffer such as tris-hydrochloric acid (Tris-Hcl) solution, filler such as mannitol and glycine, chelate such as ethylenediaminetetraacetic acid (EDTA) Agents, caffeine, polyvinylpyrrolidine, complexing agents such as ⁇ -cyclodextrin and hydroxypropyl- ⁇ -cyclodextrin, bulking agents such as glucose, mannose or dextrin, other carbohydrates such as monosaccharides and disaccharides, coloring agents, Flavoring agent, diluent, emulsifier and polyvinylpyrrolidine Hydrophilic polymers such as low
- the amount of these substances for preparation is preferably 0.01 to 100 times, more preferably 0.1 to 10 times the weight of the anti-Siglec-15 antibody.
- the composition of a suitable pharmaceutical composition in the preparation can be appropriately determined by those skilled in the art depending on the disease to be applied, the route of administration and the like.
- the excipient or carrier in the pharmaceutical composition may be liquid or solid.
- Appropriate excipients and carriers may be water for injection, physiological saline, artificial cerebrospinal fluid and other substances commonly used for parenteral administration.
- Neutral physiological saline or physiological saline containing serum albumin can also be used as a carrier.
- the pharmaceutical composition may include Tris buffer at pH 7.0-8.5, acetate buffer at pH 4.0-5.5, citrate buffer at pH 3.0-6.2. These buffers may also contain sorbitol and other compounds.
- Examples of the pharmaceutical composition of the present invention include a pharmaceutical composition containing an anti-Siglec-15 antibody and a pharmaceutical composition containing an anti-Siglec-15 antibody and at least one therapeutic agent for bone disease.
- a pharmaceutical composition comprising an anti-Siglec-15 antibody and a pharmaceutical composition comprising an anti-Siglec-15 antibody and at least one agent for treating bone metabolism disorders are molded as lyophilized products using an appropriate excipient such as sucrose. You can also.
- the pharmaceutical composition of the present invention can be prepared for parenteral administration or for oral digestive tract absorption.
- the composition and concentration of the preparation can be determined by the administration method, and the affinity of the anti-Siglec-15 antibody for Siglec-15, that is, the dissociation constant (Kd value) for Siglec-15 contained in the pharmaceutical composition of the present invention.
- Kd value the dissociation constant
- the higher the affinity (the lower the Kd value) the more effective the drug can be exerted even if the dose to humans is reduced. Based on this result, the pharmaceutical composition of the present invention is administered to humans.
- the amount can also be determined.
- about 0.1 to 100 mg / kg may be administered once every 1 to 180 days.
- Examples of the form of the pharmaceutical composition of the present invention include injections containing infusions, suppositories, nasal agents, sublingual agents, and transdermal absorption agents.
- h # 32A1-H1-1 / L2-15 described in International Publication No. WO2010 / 117011 was used as an antibody to be used as a control for comparison test.
- the antibody gene can be prepared according to International Publication No. WO2010 / 117011 pamphlet.
- the h # 32A1-H1-1 / L2-15 antibody is referred to as “K3-1115” or “K3-1115 antibody”.
- the amino acid sequence of the K3-1115 heavy chain is set forth in SEQ ID NO: 2 in the sequence listing.
- sequence consisting of amino acid residues 1 to 19 of the amino acid sequence of SEQ ID NO: 2 is a signal sequence and a heavy chain, respectively. It corresponds to the variable region and heavy chain constant region.
- the nucleotide sequence encoding the amino acid sequence of SEQ ID NO: 2 is described in SEQ ID NO: 1 in the sequence listing.
- the sequence consisting of the 1st to 57th nucleotides, the sequence consisting of the 58th to 420th nucleotides, and the sequence consisting of the 421th to 1398th nucleotides of the nucleotide sequence of SEQ ID NO: 1 are respectively a signal sequence, a heavy chain variable region sequence and a heavy chain constant.
- the normal region sequence is encoded.
- the nucleotide sequence of SEQ ID NO: 1 and the amino acid sequence of SEQ ID NO: 2 are also shown in FIG.
- the amino acid sequence of the K3-1115 light chain is set forth in SEQ ID NO: 4 in the sequence listing.
- sequence consisting of amino acid residues 1 to 20 in the amino acid sequence of SEQ ID NO: 4 is respectively a signal sequence and a light chain It corresponds to the variable region and the light chain constant region.
- sequence consisting of amino acid residues 1 to 20 in the amino acid sequence of SEQ ID NO: 4 is described in SEQ ID NO: 3 in the sequence listing.
- the sequence consisting of the 1st to 60th nucleotides of the nucleotide sequence of SEQ ID NO: 3, the sequence consisting of the 61st to 399th nucleotides, and the sequence consisting of the 400th to 714th nucleotides are respectively a signal sequence, a light chain variable region sequence and a light chain constant.
- the normal region sequence is encoded.
- the nucleotide sequence of SEQ ID NO: 3 and the amino acid sequence of SEQ ID NO: 4 are also shown in FIG.
- Siglec-15 is a basic protein, and by introducing acidic amino acid residues such as aspartic acid and glutamic acid into the antibody sequence, it is expected that an ionic bond is formed between the antigen and the antibody and the binding ability is improved.
- a glutamic acid residue with a long side chain of acidic amino acid is introduced into the threonine residue which is located in the center of CDRH3 loop considered to be the most important in the recognition site of the antibody and is expected to face the antigen side by X-ray crystal structure analysis A replacement was designed.
- the position of amino acid residue substitution corresponds to position 103 of the K3-1115 heavy chain sequence excluding the signal sequence.
- “K3-1115 / T103E heavy chain” may also be referred to as “K3-1115 / T103E antibody heavy chain”.
- WO2010 / 117011 pamphlet as a template, for example, using QuikChange Lightning Site-Directed Mutagenesis Kit (Agilent Technologies) and the following primer set:
- a K3-1115 / T103E heavy chain expression vector can be constructed by performing base substitution according to the manual of the kit.
- the obtained expression vector was designated as “pEG2 / K3-1115 / T103E”.
- sequence consisting of the 1st to 19th amino acid residues, the sequence consisting of the 20th to 140th amino acid residues, and the sequence consisting of the 141st to 466th amino acid residues of the amino acid sequence of SEQ ID NO: 6 are respectively a signal sequence and a heavy chain It corresponds to the variable region and heavy chain constant region.
- the nucleotide sequence encoding the amino acid sequence of SEQ ID NO: 6 is described in SEQ ID NO: 5 in the sequence listing.
- the sequence consisting of the 1st to 57th nucleotides, the sequence consisting of the 58th to 420th nucleotides, and the sequence consisting of the 421th to 1398th nucleotides of the nucleotide sequence of SEQ ID NO: 5 are respectively a signal sequence, a heavy chain variable region sequence and a heavy chain constant.
- the normal region sequence is encoded.
- the nucleotide sequence of SEQ ID NO: 5 and the amino acid sequence of SEQ ID NO: 6 are also shown in FIG.
- K3-1115 antibody and K3-1115 / T103E antibody 2-1 Production of K3-1115 antibody and K3-1115 / T103E antibody Antibody was produced by the following method or a method analogous thereto.
- FreeStyle 293F cells (Invitrogen) were subcultured and cultured according to the manual. 1.2 ⁇ 10 9 cells of FreeStyle 293F cells in the logarithmic growth phase (Invitrogen) were seeded in 3L Fernbach Erlenmeyer Flask (CORNING Inc.), FreeStyle293 expression medium was diluted with (Invitrogen, Inc.) 1.0 ⁇ 10 6 cells / Ml, and cultured with shaking at 90 rpm in an 8% CO 2 incubator at 37 ° C. for 1 hour.
- Polyethyleneimine (Polyscience # 24765) 3.6 mg was dissolved in Opti-Pro SFM medium (Invitrogen) 20 ml, and then heavy chain expression vector (0.4 mg) and light chain expression prepared using NucleoBond Xtra (TaKaRa) The vector (0.8 mg) was suspended in 20 ml of Opti-Pro SFM medium (Invitrogen). 20 ml of an expression vector / Opti-Pro SFM mixture was added to 20 ml of a polyethyleneimine / Opti-Pro SFM mixture, gently stirred, allowed to stand for another 5 minutes, and then added to FreeStyle 293F cells. The culture supernatant obtained by shaking culture at 90 rpm in a 37 ° C., 8% CO 2 incubator for 7 days was filtered with a Disposable Capsule Filter (Advantec # CCS-045-E1H).
- K3- 1115 antibodies can be made. Further, by combining the heavy chain expression vector pEG2 / K3-1115 / T103E prepared in Example 1 and the light chain expression vector pEF6KCL / h # 32A1-L2-15 described in International Publication No. WO2010 / 117001 pamphlet, One amino acid residue substitution product of the humanized antibody of rat anti-human Siglec-15 monoclonal antibody # 32A1 can be prepared.
- the one amino acid residue-substituted product was named “K3-1115 / T103E”.
- “K3-1115 / T103E” is sometimes referred to as “K3-1115 / T103E antibody”.
- the light chain sequences of the K3-1115 antibody and the K3-1115 / T103E antibody are identical. That is, only one amino acid residue in CDRH3 of the heavy chain differs between the K3-1115 antibody and the K3-1115 / T103E antibody.
- K3-1115 and K3-1115 / T103E antibodies were purified by the following method or a method analogous thereto.
- the culture supernatant obtained in 2-1) above was purified in two steps, rProtein A affinity chromatography (4-6 ° C.) and ceramic hydroxyapatite (room temperature).
- the buffer replacement step after purification of rProtein A affinity chromatography and after purification of ceramic hydroxylapatite was carried out at room temperature.
- 1100-1200 ml of the culture supernatant was applied to MabSelectSuRe (GE Healthcare Bioscience, HiTrap column: volume 1 ml ⁇ 2 connections) equilibrated with PBS. After all of the culture solution entered the column, the column was washed with 15-30 ml of PBS.
- the substituted antibody solution was applied to a ceramic hydroxyapatite column (Nippon Bio-Rad, Bio-Scale CHT2-1 Hydroxyapatite Column: volume 2 ml) equilibrated with 5 mM NaPi / 50 mM MES / 20 mM NaCl / pH 6.5 buffer. Applied. Linear gradient elution with sodium chloride was performed and the fractions containing antibody were collected. The fraction was subjected to liquid replacement with CBS (10 mM citrate buffer / 140 mM sodium chloride, pH 6.0) with a desalting column (GE Healthcare Bioscience, HiTrap Desalting column: volume 5 ml ⁇ 2 linked).
- CBS 10 mM citrate buffer / 140 mM sodium chloride, pH 6.0
- desalting column GE Healthcare Bioscience, HiTrap Desalting column: volume 5 ml ⁇ 2 linked.
- Escherichia coli Rosetta-gamiB (DE3) (Novagen, catalog number: 71136-4) was transformed and cultured in TB medium (Invitrogen, catalog number: 22711-022). After culturing, the sonicated cells were centrifuged, and the supernatant was purified with a HisTrap HP column (GE Healthcare, catalog number: 17-5247-01). Thereafter, the His tag was cut with FactorXa (NEW ENGLAND BioLabs, catalog number P8010L), Mono S5 / 50 GL column (GE Healthcare, catalog number: 17-5168-01), and Superdex 75 10/300 column. (GE Healthcare, catalog number: 17-5174-01) was used to purify the human Siglec-15 V-set domain by electrophoresis to a single band with a molecular weight of 14 kDa.
- K3-1115 or K3-1115 / T103E Measurement of dissociation constant of K3-1115 or K3-1115 / T103E with human Siglec-15 V-set domain K3-1115 or K3-1115 / T103E antibody and hSiglec-15 (39-165) V-set
- the dissociation constant of the domain was measured using Biacore T200 (GE Healthcare Bioscience Co., Ltd.) with the antibody immobilized as a ligand and the antigen as an analyte.
- K3-1115 or K3-1115 / T103E antibody is an anti-human IgG antibody (GE Healthcare Biosciences) immobilized on sensor chip CM5 (GE Healthcare Biosciences) by the amine coupling method. Through which about 50 RU were bound.
- HBS-EP + (10 mM HEPES pH 7.4, 0.15 M NaCl, 3 mM EDTA, 0.05% Surfactant P20) was used as a running buffer.
- a dilution series solution of the antigen (0.003-7 nM) was added onto the antibody-bound chip for 233 seconds at a flow rate of 90 ⁇ l / min, and the dissociation phase was subsequently monitored for 2000-3600 seconds.
- 3M MgCl 2 was added at a flow rate of 10 ⁇ l / min for 30 seconds.
- KD KD
- the KD value of K3-1115 was 2.6E-10 [M]
- the KD value of K3-1115 / T103E was 4.1E-12 [M]
- one amino acid residue in K3-1115 / T103E It was revealed that the substitution enhanced the affinity about 60-fold compared to K3-1115.
- 121 kinds of antibodies as one amino acid substitution of K3-1115 were prepared by the method of Example 2 or a method analogous thereto, and bound to human Siglec-15 protein according to the method of Example 3 or a method analogous thereto. Sex assessment was performed. Of these 121 substitutions, there were 6 types of antibodies showing stronger affinity for human Siglec-15 protein than K3-1115, and K3-1115 / T103E showed the highest affinity.
- the femur and tibia are removed from 5- to 8-week-old male ddY mice, and soft tissues are removed. Both ends of the femur or tibia are cut off, D-PBS is injected with a syringe with a 25 gauge needle, the bone marrow cells are pushed out, and collected in a centrifuge tube. After centrifuging at 100 g for 5 minutes at room temperature and discarding the supernatant, 1 ml of Hemolytic Buffer (RED BLOOD CELL LYSING BUFFER, manufactured by Sigma) is added to the cell pellet and suspended, and left at room temperature for 5 minutes.
- Hemolytic Buffer RED BLOOD CELL LYSING BUFFER
- a mouse bone marrow non-adherent cell prepared by the above method was prepared in an ⁇ -MEM medium containing 10% FBS and 10 ng / ml M-CSF (R & D Systems) to 1.5 ⁇ 10 5 cells / ml. 200 ⁇ l is seeded in each well of a 96-well plate and cultured in a CO 2 incubator for 2 days. The old culture medium in the 96-well plate was removed, and human RANKL (RANKL, manufactured by Peprotech) was added to a final concentration of 20 ng / ml and M-CSF containing 10 ng / ml. Add 100 ⁇ l of ⁇ medium.
- RANKL human RANKL
- the K3-1115 / T103E antibody prepared in Example 2 is added to a concentration of 3 to 100 ng / ml, and further cultured in a CO 2 incubator for 3 days.
- the tartrate-resistant acid phosphatase (TRAP) activity of the formed osteoclast is measured by the following operation.
- the culture solution in each well of the 96-well plate was removed by aspiration, 50 ⁇ l of 50 mM sodium citrate buffer (pH 6.1) containing 1% Triton X-100 was added to each well, and the plate was shaken for 5 minutes. Solubilize the cells.
- a substrate solution 50 mM sodium citrate buffer (pH 6.1) containing 5 mg / ml p-nitrophenyl phosphate and 0.46% sodium tartrate
- 50 ⁇ l of a substrate solution 50 mM sodium citrate buffer (pH 6.1) containing 5 mg / ml p-nitrophenyl phosphate and 0.46% sodium tartrate
- the enzyme reaction is stopped by adding 50 ⁇ l of 1N sodium hydroxide solution to each well of the 96-well plate.
- the absorbance at 405 nm of each well is measured and used as an index of TRAP activity.
- the inhibitory effect of K3-1115 / T103E antibody on mouse osteoclast formation can be evaluated.
- Osteoclasts are known to degrade type I collagen, a component of bone tissue, by releasing proteases such as cathepsin K.
- OsteoLyce Assay Kit (manufactured by Lonza, catalog number PA-1500) provides a 96-well plate (96-well OsteoLyse cell culture plate) coated with human collagen to which europium is bound, and osteoclasts on the plate. By measuring the amount of fluorescent collagen fragments released into the supernatant when cultivating, the bone resorption activity of osteoclasts can be evaluated in vitro.
- Normal human osteoclast progenitor cells Normal Human Natural Osteoblast Precursor Cells, purchased from Sanko Junyaku, Catalog No. 2T-110, according to the protocol attached to the cells, 96-well OsteoLyce cell culture plate with 1 ⁇ 10 4 cells / well Sowing.
- the medium is an OPGM additive factor set (purchased from Sanko Junyaku) containing fetal bovine serum (final concentration 10%), human RANKL (final concentration 63.8 ng / ml), human M-CSF (final concentration 33 ng / ml), etc.
- the basic medium for osteoclast precursor cells (OPBM, purchased from Sanko Junyaku, catalog number PT-8201) supplemented with catalog number PT-9501) was used.
- the K3-1115 antibody and K3-1115 / T103E antibody prepared in Example 2 were added to final concentrations of 0.8, 4, 20, and 100 ng / ml, and the mixture was added to a CO 2 incubator. For 5 days. 10 ⁇ l of the culture supernatant was collected, 200 ⁇ l of Fluorophore Release Reagent supplied with OsteoLyase Assay Kit was added, and fluorescence intensity was measured using a fluorescence plate reader (ARVO MX, manufactured by PerkinElmer) (Excitation: 340 nm, Emission: 615 nm). The amount of free fluorescent collagen fragments released into the culture supernatant was quantified (FIG. 5).
- the amount of free collagen fragments was suppressed in a concentration-dependent manner by the K3-1115 antibody in the range of 20 ng / ml to 100 ng / ml.
- the K3-1115 / T103E antibody when the K3-1115 / T103E antibody was added, the concentration was suppressed in a concentration range from 4 ng / ml to 100 ng / ml. This revealed that the K3-1115 / T103E antibody strongly suppressed the bone resorption activity of human osteoclasts from a lower concentration than the K3-1115 antibody.
- the amount of deoxypyridinoline excreted in the urine was significantly increased in the ovariectomized group, suggesting that bone resorption by osteoclasts is enhanced in the ovariectomized rat.
- the increase in deoxypyridinoline excretion by ovariectomy is suppressed to the same extent as in the sham operation group. From this, it was confirmed in animal models that a monoclonal antibody that specifically binds to Siglec-15 inhibits bone resorption of osteoclasts, and this bone resorption inhibition action suppressed the decrease in lumbar bone density in ovariectomized rats. It is strongly suggested. If one group to which K3-1115 is administered is added to the protocol described in a), the inhibitory effect on the bone density phenomenon by K3-1115 and K3-1115 / T103E can be compared.
- K3-1115 / T103E antibody Biological evaluation of K3-1115 / T103E antibody using ovariectomized monkeys
- the inhibitory effect of K3-1115 / T103E antibody on bone resorption activity in ovariectomized monkeys can be evaluated by the following method.
- the K3-1115 / T103E antibody prepared in Example 2 is administered once subcutaneously at a dose of 0.1 to 30 mg / kg.
- Urine is collected and collected over time until about 2 months after administration, and the bone resorption inhibitory activity of the antibody is evaluated by measuring bone metabolism markers in urine and blood.
- Bone resorption markers such as urinary N-telopeptide of type I collagen (NTX), urinary C-telopeptide of type I collagen (CTX), blood NTX, blood CTX, blood Tartrate-resistive
- NTX urinary N-telopeptide of type I collagen
- CX urinary C-telopeptide of type I collagen
- CTX urinary C-telopeptide of type I collagen
- BAP bone bone type alkaline phosphatase
- BGP blood osteocalcin
- P1NP Procollagen type I C-peptide
- the CDR variants of the humanized anti-Siglec-15 antibody of the present invention have a stronger ability to suppress osteoclast differentiation or bone resorption activity than known antibodies, and a pharmaceutical composition comprising the anti-Siglec-15 antibody is It can be a therapeutic or preventive agent for diseases of abnormal bone metabolism.
- SEQ ID NO: 1 Nucleotide sequence of K3-1115 antibody heavy chain
- SEQ ID NO: 2 Amino acid sequence of K3-1115 antibody heavy chain
- SEQ ID NO: 3 Nucleotide sequence of K3-1115 antibody light chain
- SEQ ID NO: 4 of K3-1115 antibody light chain
- Amino acid sequence SEQ ID NO: 5 Nucleotide sequence of K3-1115 / T103E antibody heavy chain
- SEQ ID NO: 6 Amino acid sequence of K3-1115 / T103E antibody heavy chain
- SEQ ID NO: 8 # 32A1
- SEQ ID NO: 9 amino acid sequence of CDRH2 of antibody # 32A1 (consisting of 14 amino acid residues)
- SEQ ID NO: 10 Amino acid sequence of CDRH3 of antibody # 32A1
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Abstract
Description
すなわち、本発明は、以下の発明を包含する。
(1)重鎖配列が、CDRH1、CDRH2、CDRH3を有する可変領域を含み、前記CDRH1は配列番号7に示されるアミノ酸配列からなり、前記CDRH2は配列番号9に示されるアミノ酸配列からなり、前記CDRH3は、配列番号11に示されるアミノ酸配列からなること;及び
軽鎖配列がCDRL1、CDRL2、CDRL3を有する可変領域を含み、前記CDRL1は配列番号12に示されるアミノ酸配列からなり、前記CDRL2は配列番号13に示されるアミノ酸配列からなり、前記CDRL3は、配列番号14に示されるアミノ酸配列からなること;
を特徴とする抗体又は該抗体の抗原結合断片。
(2)配列番号6に示されるアミノ酸配列の20乃至140番目のアミノ酸残基からなる重鎖可変領域配列及び配列番号4に示されるアミノ酸配列の21乃至133番目のアミノ酸残基からなる軽鎖可変領域配列を含むことを特徴とする(1)に記載の抗体又は該抗体の抗原結合断片。
(3)配列番号6に示されるアミノ酸配列の20乃至466番目のアミノ酸残基からなる重鎖配列及び配列番号4に示されるアミノ酸配列の21乃至238番目のアミノ酸残基からなる軽鎖配列からなることを特徴とする(1)に記載の抗体又は該抗体の抗原結合断片。
(4)配列番号6に示されるアミノ酸配列の20乃至465番目のアミノ酸残基からなる重鎖配列及び配列番号4に示されるアミノ酸配列の21乃至238番目のアミノ酸残基からなる軽鎖配列からなることを特徴とする(1)に記載の抗体又は該抗体の抗原結合断片。
(5)Fab、F(ab’)2、Fab’及びFvからなる群から選択される、(1)又は(2)に記載の抗体の抗原結合断片。
(6)scFvであることを特徴とする、(1)又は(2)に記載の抗体。
(7)(1)乃至(6)に記載の抗体又は該抗体の抗原結合断片の少なくともいずれか一つを含有することを特徴とする、医薬組成物。
(8)骨代謝異常の治療及び/又は予防剤であることを特徴とする、(7)に記載の医薬組成物。
(9)(1)乃至(6)に記載の抗体又は該抗体の抗原結合断片の少なくともいずれか一つ、並びに、ビスホスホネート、活性型ビタミンD3、カルシトニン及びその誘導体、エストラジオール等のホルモン、SERMs(selective estrogen receptor modulators)、イプリフラボン、ビタミンK2(メナテトレノン)、カルシウム製剤、PTH(parathyroid hormone)、非ステロイド性抗炎症剤、可溶性TNFレセプター、抗TNFα抗体又は該抗体の抗原結合断片、抗PTHrP(parathyroid hormone-related protein)抗体又は該抗体の抗原結合断片、IL-1レセプターアンタゴニスト、抗IL-6レセプター抗体又は該抗体の抗原結合断片、抗RANKL抗体又は該抗体の抗原結合断片、及びOCIF(osteoclastogenesis inhibitory factor)からなる群から選択される少なくともいずれか一つを含有することを特徴とする、骨代謝異常の治療及び/又は予防用医薬組成物。
(10)骨代謝異常が、骨粗鬆症、関節リウマチに伴う骨破壊、癌性高カルシウム血症、多発性骨髄腫や癌の骨転移に伴う骨破壊、巨細胞腫、骨減少症、歯根膜炎による歯の喪失、人工関節周囲の骨融解、慢性骨髄炎における骨破壊、骨ページェット病、腎性骨異栄養症、及び骨形成不全症からなる群から選択される、(8)又は(9)に記載の医薬組成物。
(11)骨代謝異常が、骨粗鬆症、関節リウマチに伴う骨破壊、又は癌の骨転移に伴う骨破壊であることを特徴とする、(10)に記載の医薬組成物。
(12)骨代謝異常が、骨粗鬆症であることを特徴とする、(11)に記載の医薬組成物。
(13)骨粗鬆症が、閉経後骨粗鬆症、老人性骨粗鬆症、ステロイドや免疫抑制剤等の治療用薬剤の使用による続発性骨粗鬆症、又は関節リウマチに伴う骨粗鬆症であることを特徴とする(12)に記載の医薬組成物。
(14)(1)乃至(6)に記載の抗体、該抗体の抗原結合断片、又は(8)若しくは(9)に記載の医薬組成物の少なくともいずれか一つを投与することを特徴とする、骨代謝異常の治療及び/又は予防方法。
(15)(1)乃至(6)に記載の抗体、該抗体の抗原結合断片、又は(8)に記載の医薬組成物の少なくともいずれか一つ、並びに、ビスホスホネート、活性型ビタミンD3、カルシトニン及びその誘導体、エストラジオール等のホルモン、SERMs(selective estrogen receptor modulators)、イプリフラボン、ビタミンK2(メナテトレノン)、カルシウム製剤、PTH(parathyroid hormone)、非ステロイド性抗炎症剤、可溶性TNFレセプター、抗TNFα抗体又は該抗体の抗原結合断片、抗PTHrP(parathyroid hormone-related protein)抗体又は該抗体の抗原結合断片、IL-1レセプターアンタゴニスト、抗IL-6レセプター抗体又は該抗体の抗原結合断片、抗RANKL抗体又は該抗体の抗原結合断片、及びOCIF(osteoclastogenesis inhibitory factor)からなる群から選択される少なくともいずれか一つを同時又は連続して投与することを特徴とする、骨代謝異常の治療及び/又は予防方法。
(16)骨代謝異常が、骨粗鬆症、関節リウマチに伴う骨破壊、又は癌の骨転移に伴う骨破壊であることを特徴とする(14)又は(15)に記載の治療及び/又は予防方法。
(17)骨代謝異常が、骨粗鬆症であることを特徴とする、(16)に記載の治療及び/又は予防方法。
(18)骨粗鬆症が、閉経後骨粗鬆症、老人性骨粗鬆症、ステロイドや免疫抑制剤等の治療用薬剤の使用による続発性骨粗鬆症、又は関節リウマチに伴う骨粗鬆症であることを特徴とする(17)に記載の治療及び/又は予防方法。
(19)(1)乃至(6)のいずれか一つに記載の抗体をコードするポリヌクレオチド。
(20)配列番号5に示されるヌクレオチド配列の58乃至420番目のヌクレオチドからなるヌクレオチド配列からなるポリヌクレオチド及び配列番号3に示されるヌクレオチド配列の61乃至399番目のヌクレオチドからなるヌクレオチド配列からなるポリヌクレオチドを含むことを特徴とする(19)に記載のポリヌクレオチド。
(21)配列番号5に示されるヌクレオチド配列の58乃至1398番目のヌクレオチドからなるヌクレオチド配列からなるポリヌクレオチド及び配列番号3に示されるヌクレオチド配列の61乃至714番目のヌクレオチドからなるヌクレオチド配列からなるポリヌクレオチドを含むことを特徴とする(19)に記載のポリヌクレオチド。
(22)(19)乃至(21)に記載のいずれか一つのポリヌクレオチドを含むベクター。
(23)(19)乃至(21)に記載のいずれか一つのポリヌクレオチドを含む形質転換宿主細胞。
(24)(22)に記載のベクターを含む形質転換宿主細胞。
(25)(23)又は(24)に記載の宿主細胞を培養し、培養産物から抗体を精製する工程を含む(1)乃至(6)のいずれか一つに記載の抗体の生産方法。
1.Siglec-15
本発明者らによって、Siglec-15遺伝子は巨細胞腫において特異的に発現していることが見出された。また、本発明者らによってSiglec-15遺伝子は単球由来細胞株が破骨細胞に分化する際に発現量が増加することも見出された。
2.骨代謝異常の検出
Siglec-15遺伝子は、ヒト各種骨組織検体群における遺伝子の発現量の解析をすると、破骨細胞様の多核巨細胞が多数出現する骨腫瘍であり、臨床的所見として骨溶解性の骨破壊を特徴とする(Bullough et al.,Atlas of Orthopedic Pathology 2nd edition, pp17.6-17.8,Lippincott Williams & Wilkins Publishers(1992))巨細胞腫(Giant cell tumor; GCT)において有意に発現量が増加していることが見出された。
3.抗Siglec-15抗体の製造
本発明のSiglec-15に対する抗体は、常法を用いて、Siglec-15又はSiglec-15のアミノ酸配列から選択される任意のポリペプチドを動物に免疫し、生体内に産生される抗体を採取、精製することによって得ることができる。抗原となるSiglec-15の生物種はヒトに限定されず、マウス、ラット等のヒト以外の動物に由来するSiglec-15を動物に免疫することもできる。この場合には、取得された異種Siglec-15に結合する抗体とヒトSiglec-15との交差性を試験することによって、ヒトの疾患に適用可能な抗体を選別できる。
4.抗Siglec-15抗体を含有する医薬
上述の「3.抗Siglec-15抗体の製造」の項に記載された方法で得られる抗Siglec-15抗体の中から、Siglec-15の生物活性を中和する抗体を得ることができる。これらSiglec-15の生物活性を中和する抗体は、生体内でのSiglec-15の生物活性、即ち、破骨細胞の分化及び/又は成熟を阻害することから、医薬として、破骨細胞の分化及び/又は成熟異常に起因する骨代謝異常に対する治療及び/又は予防剤として用いることができる。骨代謝異常は正味の骨喪失(骨減少症又は骨溶解症)によって特徴付けられるいずれの障害であってもよい。一般に、抗Siglec-15抗体による治療及び/又は予防は、骨吸収を抑制する必要がある場合に適用される。抗Siglec-15抗体で治療及び/又は予防可能な骨代謝異常としては、骨粗鬆症(閉経後骨粗鬆症、老人性骨粗鬆症、ステロイドや免疫抑制剤等の治療用薬剤の使用による続発性骨粗鬆症、関節リウマチに伴う骨粗鬆症)、関節リウマチに伴う骨破壊、癌性高カルシウム血症、多発性骨髄腫や癌の骨転移に伴う骨破壊、巨細胞腫、骨減少症、歯根膜炎による歯の喪失、人工関節周囲の骨融解、慢性骨髄炎における骨破壊、骨ページェット病、腎性骨異栄養症、骨形成不全症などを挙げることができるが、破骨細胞による正味の骨喪失を伴う疾患であれば、これらに限定されない。上記の医薬としての抗Siglec-15抗体の例として、#32A1抗体から作製されたヒト化抗体およびこれのCDR改変体を挙げることができる。
実施例
以下、本発明を実施例により具体的に説明するが、本発明はこれらに限定されるものではない。なお、下記実施例において遺伝子操作に関する各操作は特に明示がない限り、「モレキュラークローニング(Molecular Cloning)」(Sambrook,J.,Fritsch,E.F.及びManiatis,T.著,Cold Spring Harbor Laboratory Pressより1989年に発刊)に記載の方法により行うか、又は、市販の試薬やキットを用いる場合には市販品の指示書に従って使用した。
本明細書では、比較試験の対照となる抗体として国際公開第WO2010/117011号パンフレットに記載のh#32A1-H1-1/L2-15を使用した。抗体遺伝子は、国際公開第WO2010/117011号パンフレットに従って作製することが可能である。なお、本明細書においては前記のh#32A1-H1-1/L2-15抗体を「K3-1115」あるいは「K3-1115抗体」と呼称している。
K3-1115重鎖のアミノ酸配列は、配列表の配列番号2に記載されている。配列番号2のアミノ酸配列の1乃至19番目のアミノ残基からなる配列、20乃至140番目のアミノ酸残基からなる配列、141乃至466番目のアミノ酸残基からなる配列が、それぞれシグナル配列、重鎖可変領域、重鎖定常領域に相当する。配列番号2のアミノ酸配列をコードするヌクレオチド配列は、配列表の配列番号1に記載されている。配列番号1のヌクレオチド配列の1乃至57番目のヌクレオチドからなる配列、58乃至420番目のヌクレオチドからなる配列、421乃至1398番目のヌクレオチドからなる配列が、それぞれシグナル配列、重鎖可変領域配列、重鎖定常領域配列をコードしている。配列番号1のヌクレオチド配列及び配列番号2のアミノ酸配列は、図1にも記載されている。
K3-1115軽鎖のアミノ酸配列は、配列表の配列番号4に記載されている。配列番号4のアミノ酸配列の1乃至20番目のアミノ残基からなる配列、21乃至133番目のアミノ酸残基からなる配列、134乃至238番目のアミノ酸残基からなる配列が、それぞれシグナル配列、軽鎖可変領域、軽鎖定常領域に相当する。配列番号4のアミノ酸配列をコードするヌクレオチド配列は、配列表の配列番号3に記載されている。配列番号3のヌクレオチド配列の1乃至60番目のヌクレオチドからなる配列、61乃至399番目のヌクレオチドからなる配列、400乃至714番目のヌクレオチドからなる配列が、それぞれシグナル配列、軽鎖可変領域配列、軽鎖定常領域配列をコードしている。配列番号3のヌクレオチド配列及び配列番号4のアミノ酸配列は、図2にも記載されている。
Siglec-15は塩基性の蛋白質であり、アスパラギン酸、グルタミン酸などの酸性アミノ酸残基の抗体配列への導入により、抗原-抗体間でイオン結合が形成されて結合能が向上することが期待される。抗体の認識部位で最も重要と考えられるCDRH3ループの中央に位置し、X線結晶構造解析により抗原側に向いていると予想されるスレオニン残基に酸性アミノ酸で側鎖の長いグルタミン酸残基を導入する置換体を設計した。置換を導入する重鎖配列としてK3-1115重鎖を選択し、K3-1115重鎖配列のCDRH3配列の3番目のアミノ酸残基であるスレオニン残基をグルタミン酸残基に置換した重鎖配列を「K3-1115/T103E重鎖」と命名した。アミノ酸残基の置換の位置は、シグナル配列を除いたK3-1115重鎖配列の103番目に相当する。なお、「K3-1115/T103E重鎖」は「K3-1115/T103E抗体重鎖」と呼称されることもある。
国際公開第WO2010/117011号パンフレットの実施例28に記載のpEG2/h#32A1-H1-1をテンプレートとして、例えば、QuikChange Lightning Site-Directed Mutagenesis Kit(Agilent Technologies社)と下記のプライマーセットを用いて、キットのマニュアルにしたがって塩基置換を行うことにより、K3-1115/T103E重鎖発現ベクターを構築することができる。得られた発現ベクターを「pEG2/K3-1115/T103E」と命名した。
塩基置換導入用プライマーセット
5’-CTACTACTGCGCCAGGTCCTTGGAGGGCGGCGAC-3’(32A1_HT103EFw:配列表の配列番号15)
5’-GTCGCCGCCCTCCAAGGACCTGGCGCAGTAGTAG-3’(32A1_HT103ERv:配列表の配列番号16)
K3-1115/T103E重鎖のアミノ酸配列は、配列表の配列番号6に記載されている。配列番号6のアミノ酸配列の1乃至19番目のアミノ残基からなる配列、20乃至140番目のアミノ酸残基からなる配列、141乃至466番目のアミノ酸残基からなる配列が、それぞれシグナル配列、重鎖可変領域、重鎖定常領域に相当する。配列番号6のアミノ酸配列をコードするヌクレオチド配列は、配列表の配列番号5に記載されている。配列番号5のヌクレオチド配列の1乃至57番目のヌクレオチドからなる配列、58乃至420番目のヌクレオチドからなる配列、421乃至1398番目のヌクレオチドからなる配列が、それぞれシグナル配列、重鎖可変領域配列、重鎖定常領域配列をコードしている。配列番号5のヌクレオチド配列及び配列番号6のアミノ酸配列は、図3にも記載されている。
2-1) K3-1115抗体及びK3-1115/T103E抗体の生産
以下の方法あるいはこれに準じた方法によって、抗体の生産を行った。FreeStyle 293F細胞(Invitrogen社)はマニュアルに従い、継代、培養をおこなった。対数増殖期の1.2×109個のFreeStyle 293F細胞(Invitrogen社)を3L Fernbach Erlenmeyer Flask(CORNING社)に播種し、FreeStyle293 expression medium (Invitrogen社)で希釈して1.0×106細胞/mlに調製したのちに、37℃、8%CO2インキュベーター内で90rpmで一時間振とう培養した。Polyethyleneimine(Polyscience #24765)3.6mgをOpti-Pro SFM培地(Invitrogen社)20mlに溶解し、次にNucleoBond Xtra(TaKaRa社)を用いて調製した重鎖発現ベクター(0.4mg)及び軽鎖発現ベクター(0.8mg)を20mlのOpti-Pro SFM培地(Invitrogen社)に懸濁した。Polyethyleneimine/Opti-Pro SFM混合液20mlに、発現ベクター/Opti-Pro SFM混合液20mlを加え穏やかに攪拌し、さらに5分間放置した後にFreeStyle 293F細胞に添加した。37℃、8%CO2インキュベーターで7日間、90rpmで振とう培養して得られた培養上清をDisposable Capsule Filter (Advantec #CCS-045-E1H)でろ過した。
また、実施例1で作製された重鎖発現ベクターpEG2/K3-1115/T103E及び国際公開第WO2010/117011号パンフレットに記載の軽鎖発現ベクターpEF6KCL/h#32A1-L2-15を組み合わせることによって、ラット抗ヒトSiglec-15モノクローナル抗体#32A1のヒト化抗体の1アミノ酸残基置換体を作製することが可能である。前記の1アミノ酸残基置換体を「K3-1115/T103E」と命名した。本明細書では「K3-1115/T103E」は、「K3-1115/T103E抗体」と呼称されることもある。上記の抗体の調製法で述べたように、K3-1115抗体及びK3-1115/T103E抗体の軽鎖配列は同一である。すなわち、K3-1115抗体及びK3-1115/T103E抗体の間では、重鎖のCDRH3中の1アミノ酸残基のみ異なっている。
2-2)K3-1115及びK3-1115/T103E抗体の精製
K3-1115及びK3-1115/T103E抗体は、以下の方法あるいはこれに準じた方法によって精製された。
3-1)ヒトSiglec-15 V-setドメインの発現精製
ヒトSiglec-15 V-setドメイン(NCBIの蛋白データベースのACCESSION番号NP_998767のアミノ酸配列の39乃至165番目のアミノ酸残基からなるポリペプチド)のN末端側にHisタグ、および、FactorXa認識配列を連結させた蛋白をコードするDNAをベクターpDEST14(インビトロジェン社、カタログ番号:11801-016)に組み込んだ。このプラスミドを用いて、大腸菌Rosetta-gamiB(DE3)(ノバジェン社、カタログ番号:71136-4)を形質転換し、TB培地(インビトロジェン社、カタログ番号:22711-022)で培養した。培養後、超音波破砕した菌体を遠心分離し、上清をHisTrap HPカラム(GEヘルスケア社、カタログ番号:17-5247-01)で精製した。その後、FactorXa(NEW ENGLAND BioLabs社、カタログ番号P8010L)でHisタグを切断後、Mono S5/50 GLカラム(GEヘルスケア社、カタログ番号:17-5168-01)、さらに、Superdex 75 10/300カラム(GEヘルスケア社、カタログ番号:17-5174-01)を用いて、電気泳動で分子量14kDaの単一バンドになるまでヒトSiglec-15 V-setドメインを精製した。
3-2)K3-1115又はK3-1115/T103EのヒトSiglec-15 V-setドメインとの解離定数の測定
K3-1115又はK3-1115/T103E抗体とhSiglec-15(39ー165)V-setドメインの解離定数測定は、Biacore T200(GEヘルスケアバイオサイエンス(株))を使用し、抗体をリガンドとして固定化し、抗原をアナライトとして測定した。K3-1115又はK3-1115/T103E抗体は、アミンカップリング法にてセンサーチップCM5(GEヘルスケアバイオサイエンス(株))へ固定化した抗ヒトIgG抗体(GEヘルスケアバイオサイエンス(株))を介し、約50RUを結合させた。ランニングバッファーとしてHBS-EP+(10mM HEPES pH7.4、0.15M NaCl,3mM EDTA、0.05%Surfactant P20)を用いた。抗体を結合したチップ上に、抗原の希釈系列溶液(0.003-7nM)を流速90μl/分で233秒間添加し、引き続き2000~3600秒間の解離相をモニターした。再生溶液として、3M MgCl2を流速10μl/分で30秒間添加した。データの解析には、分析ソフトウェア(Biacore T200 Evaluation Software, version 1.0)の1:1結合モデルを用いて、結合速度定数kon、解離速度定数koff及び解離定数(KD;KD=koff/kon)を算出した。その結果、K3-1115のKD値は2.6E-10[M]、K3-1115/T103EのKD値は4.1E-12[M]であり、K3-1115/T103Eにおける1アミノ酸残基の置換によって、K3-1115と比較して親和性が約60倍増強されることが明らかとなった。なお、K3-1115の1アミノ酸置換体として121種の抗体が実施例2の方法又はこれに準じた方法によって作製され、実施例3の方法又はこれに準じた方法に従ってヒトSiglec-15蛋白質に対する結合性評価が行われた。これらの121種の置換体において、ヒトSiglec-15蛋白質に対してK3-1115より強い親和性を示す抗体は6種類存在し、K3-1115/T103Eは最も高い親和性を示した。
5~8週齢の雄ddYマウスより大腿骨と脛骨を摘出し、軟組織を除去する。この大腿骨あるいは脛骨の両端を切り落とし、25ゲージの注射針付きシリンジによりD-PBSを注入して骨髄細胞を押し出して、遠心チューブに回収する。室温で100g、5分間遠心して上清を捨てた後に、細胞のペレットにHemolytic Buffer 1ml(RED BLOOD CELL LYSING BUFFER、シグマ社製)を加えて懸濁し、室温で5分間放置する。20mlのD-PBSを加えて室温で100g,5分間遠心し、上清を捨てた後に細胞のペレットに5ng/ml M-CSF(R&D Systems社製)、10% ウシ胎児血清(FBS)を含有するMEM-α培地(インビトロジェン社製)10mlを加えて懸濁し、セルストレイナー(40μm Nylon、BDファルコン社製)を通して凝集物を除く。この細胞を75cm2-T フラスコ(付着細胞用)に移して、CO2インキュベーター中で1晩培養する。1晩培養後、T-フラスコに付着していない細胞を回収して、マウス骨髄非付着細胞として使用する。上記の方法で調製されるマウス骨髄非付着細胞を10% FBSと10ng/ml M-CSF(R&D Systems社製)を含むα-MEM培地で1.5×105細胞/mlに調製したものを96穴プレートの各ウェルに200μl播種して、CO2インキュベーター中で2日間培養する。96穴プレート中の古い培養液を除去して、ヒトRANKL(RANKL、ぺプロテック社製)を終濃度20ng/ml、M-CSFを10ng/mlになるように添加した10% FBS含有MEM-α培地100μlを添加する。この細胞培養液に、実施例2で調製したK3-1115/T103E抗体を3~100ng/mlの濃度になるように添加して、更に3日間CO2インキュベーター中で培養する。培養終了後に、形成された破骨細胞の酒石酸耐性酸性フォスファターゼ(TRAP)活性を以下の操作で測定する。96穴プレートの各ウェルの培養液を吸引除去して、1% Triton X-100を含有する50mMクエン酸ナトリウム緩衝液(pH6.1)50μlを各ウェルに加え、プレート振とう機で5分間振とうして細胞を可溶化する。これらの各ウェルに基質溶液(5mg/ml p-nitrophenyl phosphate及び0.46% 酒石酸ナトリウムを含有する50mMクエン酸ナトリウム緩衝液(pH6.1))50μlを加えて室温で10分間インキュベートする。インキュベート後に96穴プレートの各ウェルに1N水酸化ナトリウム溶液50μlを加えて酵素反応を停止させる。酵素反応停止後に各ウェルの405nmの吸光度を測定してTRAP活性の指標とする。抗体非添加時とのTRAP活性の比較により、K3-1115/T103E抗体のマウス破骨細胞形成抑制効果を評価することができる。
破骨細胞はカテプシンKなどのプロテアーゼを放出することにより、骨組織の構成成分であるI型コラーゲンを分解することが知られている。OsteoLyse Assay Kit(Lonza社製、カタログ番号 PA-1500)は、ユーロピウムが結合したヒトコラーゲンをコーティングした96穴プレート(96-well OsteoLyse cell culture plate)を提供しており、同プレート上で破骨細胞を培養した際に上清に遊離される蛍光コラーゲン断片量を測定することにより、破骨細胞の骨吸収活性をin vitroで評価することが可能である。
a)動物実験のプロトコール
12週齢雌性F344ラット(日本チャールス・リバー社より入手)に両側卵巣摘除を施術し、溶媒投与群、K3-1115/T103E抗体投与群の2群に分ける。また偽手術群についても1群設定する。抗体を投与する群については、実施例2で調製したK3-1115/T103E抗体を、各1mg/kgの用量で腹腔内に週3回、手術翌日から4週間反復投与する。溶媒投与群及び偽手術群には、溶媒として0.01% Tween20含有PBSを腹腔内に投与する。投与開始4週後に絶食下で24時間採尿を行い、尿検体は測定まで-80℃で保存する。採尿終了後にラットを安楽死させ、腰椎を摘出する。
b)腰椎骨密度の測定
摘出した腰椎に付着している軟組織を除去し、第4~6腰椎を切り出す。エタノール中で振とう後に風乾することにより脱脂及び脱水し、骨密度測定装置(DCS-600EX、アロカ社製)を用いて骨密度を測定する。偽手術群に対し、卵巣摘除群では有意な腰椎骨密度の減少が認められるが、K3-1115/T103E抗体投与群では卵巣摘除による骨密度の減少が有意に抑制される。a)に記載のプロトコールにK3-1115を投与する1群を追加すれば、K3-1115とK3-1115/T103Eによる骨密度現象に対する抑制効果を比較することができる。
c)尿中デオキシピリジノリン排泄量の測定
I型コラーゲン架橋の各種代謝産物は骨の代謝回転、特に骨吸収を鋭敏に反映し、なかでもデオキシピリジノリンは主として骨のコラーゲンに局在することから骨吸収の指標として信頼性が高いとされている。
K3-1115/T103E抗体の卵巣摘出サルにおける骨吸収活性の抑制効果は、以下に示す方法により評価が可能である。
配列番号2:K3-1115抗体重鎖のアミノ酸配列
配列番号3:K3-1115抗体軽鎖のヌクレオチド配列
配列番号4:K3-1115抗体軽鎖のアミノ酸配列
配列番号5:K3-1115/T103E抗体重鎖のヌクレオチド配列
配列番号6:K3-1115/T103E抗体重鎖のアミノ酸配列
配列番号7:#32A1抗体のCDRH1のアミノ酸配列
配列番号8:#32A1抗体のCDRH2のアミノ酸配列(19アミノ酸残基からなる)
配列番号9:#32A1抗体のCDRH2のアミノ酸配列(14アミノ酸残基からなる)
配列番号10:#32A1抗体のCDRH3のアミノ酸配列
配列番号11:K3-1115/T103E抗体のCDRH3のアミノ酸配列
配列番号12:#32A1抗体のCDRL1のアミノ酸配列
配列番号13:#32A1抗体のCDRL2のアミノ酸配列
配列番号14:#32A1抗体のCDRL3のアミノ酸配列
配列番号15:PCRプライマー32A1_HT103EFw
配列番号16:PCRプライマー32A1_HT103ERv
Claims (25)
- 重鎖配列が、CDRH1、CDRH2、CDRH3を有する可変領域を含み、前記CDRH1は配列番号7に示されるアミノ酸配列からなり、前記CDRH2は配列番号9に示されるアミノ酸配列からなり、前記CDRH3は、配列番号11に示されるアミノ酸配列からなること;及び
軽鎖配列がCDRL1、CDRL2、CDRL3を有する可変領域を含み、前記CDRL1は配列番号12に示されるアミノ酸配列からなり、前記CDRL2は配列番号13に示されるアミノ酸配列からなり、前記CDRL3は、配列番号14に示されるアミノ酸配列からなること;
を特徴とする抗体又は該抗体の抗原結合断片。 - 配列番号6に示されるアミノ酸配列の20乃至140番目のアミノ酸残基からなる重鎖可変領域配列及び配列番号4に示されるアミノ酸配列の21乃至133番目のアミノ酸残基からなる軽鎖可変領域配列を含むことを特徴とする請求項1に記載の抗体又は該抗体の抗原結合断片。
- 配列番号6に示されるアミノ酸配列の20乃至466番目のアミノ酸残基からなる重鎖配列及び配列番号4に示されるアミノ酸配列の21乃至238番目のアミノ酸残基からなる軽鎖配列からなることを特徴とする請求項1に記載の抗体又は該抗体の抗原結合断片。
- 配列番号6に示されるアミノ酸配列の20乃至465番目のアミノ酸残基からなる重鎖配列及び配列番号4に示されるアミノ酸配列の21乃至238番目のアミノ酸残基からなる軽鎖配列からなることを特徴とする請求項1に記載の抗体又は該抗体の抗原結合断片。
- Fab、F(ab’)2、Fab’及びFvからなる群から選択される、請求項1又は2に記載の抗体の抗原結合断片。
- scFvであることを特徴とする、請求項1又は2に記載の抗体。
- 請求項1乃至6に記載の抗体又は該抗体の抗原結合断片の少なくともいずれか一つを含有することを特徴とする、医薬組成物。
- 骨代謝異常の治療及び/又は予防剤であることを特徴とする、請求項7に記載の医薬組成物。
- 請求項1乃至6に記載の抗体又は該抗体の抗原結合断片の少なくともいずれか一つ、並びに、ビスホスホネート、活性型ビタミンD3、カルシトニン及びその誘導体、エストラジオール等のホルモン、SERMs(selective estrogen receptor modulators)、イプリフラボン、ビタミンK2(メナテトレノン)、カルシウム製剤、PTH(parathyroid hormone)、非ステロイド性抗炎症剤、可溶性TNFレセプター、抗TNFα抗体又は該抗体の抗原結合断片、抗PTHrP(parathyroid hormone-related protein)抗体又は該抗体の抗原結合断片、IL-1レセプターアンタゴニスト、抗IL-6レセプター抗体又は該抗体の抗原結合断片、抗RANKL抗体又は該抗体の抗原結合断片、及びOCIF(osteoclastogenesis inhibitory factor)からなる群から選択される少なくともいずれか一つを含有することを特徴とする、骨代謝異常の治療及び/又は予防用医薬組成物。
- 骨代謝異常が、骨粗鬆症、関節リウマチに伴う骨破壊、癌性高カルシウム血症、多発性骨髄腫や癌の骨転移に伴う骨破壊、巨細胞腫、骨減少症、歯根膜炎による歯の喪失、人工関節周囲の骨融解、慢性骨髄炎における骨破壊、骨ページェット病、腎性骨異栄養症、及び骨形成不全症からなる群から選択される、請求項8又は9に記載の医薬組成物。
- 骨代謝異常が、骨粗鬆症、関節リウマチに伴う骨破壊、又は癌の骨転移に伴う骨破壊であることを特徴とする、請求項10に記載の医薬組成物。
- 骨代謝異常が、骨粗鬆症であることを特徴とする、請求項11に記載の医薬組成物。
- 骨粗鬆症が、閉経後骨粗鬆症、老人性骨粗鬆症、ステロイドや免疫抑制剤等の治療用薬剤の使用による続発性骨粗鬆症、又は関節リウマチに伴う骨粗鬆症であることを特徴とする請求項12に記載の医薬組成物。
- 請求項1乃至6に記載の抗体、該抗体の抗原結合断片、又は請求項8若しくは9に記載の医薬組成物の少なくともいずれか一つを投与することを特徴とする、骨代謝異常の治療及び/又は予防方法。
- 請求項1乃至6に記載の抗体、該抗体の抗原結合断片、又は請求項8に記載の医薬組成物の少なくともいずれか一つ、並びに、ビスホスホネート、活性型ビタミンD3、カルシトニン及びその誘導体、エストラジオール等のホルモン、SERMs(selective estrogen receptor modulators)、イプリフラボン、ビタミンK2(メナテトレノン)、カルシウム製剤、PTH(parathyroid hormone)、非ステロイド性抗炎症剤、可溶性TNFレセプター、抗TNFα抗体又は該抗体の抗原結合断片、抗PTHrP(parathyroid hormone-related protein)抗体又は該抗体の抗原結合断片、IL-1レセプターアンタゴニスト、抗IL-6レセプター抗体又は該抗体の抗原結合断片、抗RANKL抗体又は該抗体の抗原結合断片、及びOCIF(osteoclastogenesis inhibitory factor)からなる群から選択される少なくともいずれか一つを同時又は相前後してして投与することを特徴とする、骨代謝異常の治療及び/又は予防方法。
- 骨代謝異常が、骨粗鬆症、関節リウマチに伴う骨破壊、又は癌の骨転移に伴う骨破壊であることを特徴とする、請求項14又は15に記載の治療及び/又は予防方法。
- 骨代謝異常が、骨粗鬆症であることを特徴とする、請求項16に記載の治療及び/又は予防方法。
- 骨粗鬆症が、閉経後骨粗鬆症、老人性骨粗鬆症、ステロイドや免疫抑制剤等の治療用薬剤の使用による続発性骨粗鬆症、又は関節リウマチに伴う骨粗鬆症であることを特徴とする請求項17に記載の治療及び/又は予防方法。
- 請求項1乃至6のいずれか一つに記載の抗体をコードするポリヌクレオチド。
- 配列番号5に示されるヌクレオチド配列の58乃至420番目のヌクレオチドからなるヌクレオチド配列からなるポリヌクレオチド及び配列番号3に示されるヌクレオチド配列の61乃至399番目のヌクレオチドからなるヌクレオチド配列からなるポリヌクレオチドを含むことを特徴とする請求項19に記載のポリヌクレオチド。
- 配列番号5に示されるヌクレオチド配列の58乃至1398番目のヌクレオチドからなるヌクレオチド配列からなるポリヌクレオチド及び配列番号3に示されるヌクレオチド配列の61乃至714番目のヌクレオチドからなるヌクレオチド配列からなるポリヌクレオチドを含むことを特徴とする請求項19に記載のポリヌクレオチド。
- 請求項19乃至21に記載のいずれか一つのポリヌクレオチドを含むベクター。
- 請求項19乃至21に記載のいずれか一つのポリヌクレオチドを含む形質転換宿主細胞。
- 請求項22に記載のベクターを含む形質転換宿主細胞。
- 請求項23又は24に記載の宿主細胞を培養し、培養産物から抗体を精製する工程を含む請求項1乃至6のいずれか一つに記載の抗体の生産方法。
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RU2014143798A RU2014143798A (ru) | 2012-03-30 | 2013-03-29 | Антитело к сиглек-15 с модифицированной cdr |
BR112014024269A BR112014024269A8 (pt) | 2012-03-30 | 2013-03-29 | Anticorpo ou um fragmento de ligação a antígeno do anticorpo, fragmento de ligação a antígeno do anticorpo, composição farmacêutica, uso de um anticorpo ou um fragmento de ligação a antígeno, uso de uma composição, vetor, célula hospedeira transformada, e, método para produzir um anticorpo |
SG11201405966PA SG11201405966PA (en) | 2012-03-30 | 2013-03-29 | Cdr-modified anti-siglec-15 antibody |
US14/388,347 US9464133B2 (en) | 2012-03-30 | 2013-03-29 | CDR-modified anti-Siglec-15 antibody |
ES13768508.7T ES2660472T3 (es) | 2012-03-30 | 2013-03-29 | Anticuerpo anti-Siglec-15 modificado con CDR |
CN201380028931.6A CN104334722A (zh) | 2012-03-30 | 2013-03-29 | 具有修饰的cdr的抗-涎免凝集素15抗体 |
MX2014011828A MX2014011828A (es) | 2012-03-30 | 2013-03-29 | Anticuerpo anti-siglec-15 con region determinante de complementariedad modificada. |
IN8215DEN2014 IN2014DN08215A (ja) | 2012-03-30 | 2013-03-29 | |
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CA2868959A CA2868959A1 (en) | 2012-03-30 | 2013-03-29 | Cdr-modified anti-siglec-15 antibody |
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HK15105295.4A HK1204657A1 (en) | 2012-03-30 | 2015-06-03 | Anti-siglec15 antibody with modified cdr cdr - 15 |
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US8168181B2 (en) | 2006-02-13 | 2012-05-01 | Alethia Biotherapeutics, Inc. | Methods of impairing osteoclast differentiation using antibodies that bind siglec-15 |
HUE025262T2 (en) | 2007-10-11 | 2016-02-29 | Daiichi Sankyo Co Ltd | Antibody targeting osteoclast-linked Siglec-15 protein |
JP6268173B2 (ja) | 2012-07-19 | 2018-01-24 | 第一三共株式会社 | 抗Siglec−15抗体 |
WO2015192214A1 (en) * | 2014-06-18 | 2015-12-23 | Alethia Biotherapeutics Inc. | Anti-siglec-15 antibodies for use in treatment of osteogenesis imperfecta |
CN113817057B (zh) * | 2020-06-19 | 2024-02-20 | 盛禾(中国)生物制药有限公司 | 一种抗siglec15抗体及其应用 |
CN114957468A (zh) * | 2021-02-25 | 2022-08-30 | 石药集团巨石生物制药有限公司 | 一种抗Siglec15抗体及其用途 |
CN113577283A (zh) * | 2021-07-19 | 2021-11-02 | 河北医科大学第三医院 | Siglec-15抑制剂在制备防治骨巨细胞瘤药物中的应用 |
WO2023030311A1 (zh) * | 2021-08-31 | 2023-03-09 | 上海医药集团股份有限公司 | 靶向Siglec15的抗原结合蛋白及其用途 |
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