| Project/Area Number |
12671397
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Orthopaedic surgery
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| Research Institution | The University of Tokyo |
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Principal Investigator |
NAKAMURA Ichiro (2001) Dept of Orthop surg, The University of Tokyo, Instractor, 医学部・附属病院, 助手 (30323596)
清水 学 (2000) 東京大学, 医学部・附属病院, 助手 (60313136)
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| Co-Investigator(Kenkyū-buntansha) |
ODA Hiromi Dept of Orthop surg, The University of Tokyo, Associate prof, 医学部・附属病院, 助教授 (60101698)
TANAKA Sakae Dept of Orthop surg, The University of Tokyo, Instractor, 医学部・附属病院, 助手 (50282661)
仲村 一郎 東京大学, 医学部・附属病院, 助手 (30323596)
河野 慎次郎 東京大学, 医学部・附属病院, 助手 (40333463)
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| Project Period (FY) |
2000 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 2001: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 2000: ¥1,700,000 (Direct Cost: ¥1,700,000)
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| Keywords | ostooclast / RANKL / RANK / rheumatoid arthritis, / 破骨細胞数 / TRAF6 |
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| Research Abstract |
To clarify the mechanism by which osteoclasts are formed in culture of rheumatoid synoviocytes by exploring the involvement of receptor activator of nuclear factor kappaB ligand (RANKL). RANKL expression was examined by Northern blotting in synovial tissues from 5 rheumatoid arthritis (RA) patients and tissues from patients with osteoarthritis (OA). RANKL expression and the ability of synovial fibroblasts to support osteoclastogenesis were investigated in coculture with PBMC in the presence or absence of 1, 25(OH)2D3, and soluble RANKL/ODF and osteoprotegerin (OPG) were measured by enzyme-linked immunosorbent assay. The effects of OPG on the osteoclastogenesis in the primary culture of rheumatoid synoviocytes and the coculture system were determined. Synovial fibroblasts did not induce osteoclastogenesis when separately cocultured with PBMC. Northern blotting revealed that RANKL/ODF was highly expressed in all tissues from RA and GCT patients, but not from OA or OS patients. Cultured rheumatoid synovial fibroblasts efficiently induced osteoclastogenesis in the presence of 1, 25(OH)2D3, which was accompanied by up-regulated expression of RANKL and decreased production of OPG/OCIF. Osteoclastogenesis from synoviocytes was dose-dependently inhibited by OPG. CONCLUSION : RANKL/ODF expressed on synovial fibroblasts is involved in rheumatoid bone destruction by inducing osteoclastogenesis and would therefore be a good therapeutic target.
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