| Project/Area Number |
14571411
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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 | Kinki University |
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Principal Investigator |
AKAGI Masao Kinki University, School of Med., Associate Professor, 医学部, 助教授 (00273441)
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| Co-Investigator(Kenkyū-buntansha) |
SOEN S Kinki University, hospital, Professor, 医学部附属病院, 教授 (10142598)
FUKUDA K Kinki University, School of Med., Professor, 医学部附属病院, 教授 (50201744)
NONAKA T Kinki University, School of Med., Lecturer, 医学部, 講師 (70268407)
OH M Kinki University, hospital, Assistant, 医学部附属病院, 助手 (20319734)
原 文彦 近畿大学, 医学部, 助手 (30340798)
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| Project Period (FY) |
2002 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2004: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 2003: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2002: ¥2,600,000 (Direct Cost: ¥2,600,000)
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| Keywords | Osteoarthrosis / Synovium / Cartilage / Hyaluronan / Depolymerization / Mechanical stress / Reactive oxygen species / 分子量 / フリーラジカル / 過酸化物質 / スーパーオキサイドディスムターゼ / 軟骨保護作用 / Superoxidedismutase / ヒアルロン酸合成酵素 / 関節炎 / 活性酸素種 / 阻血再潅流 |
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| Research Abstract |
Etiology of osteoarthritis is supposed to involve cartilage degeneration and synovial proliferation. We have previously demonstrated that reactive oxygen species (ROS) are involved in cartilage degradation. Decreased size of hyaluronan (NA), the major macromolecule in synovial fluid, to which it imparts viscosity, is reported in patients with arthritis. The purpose of this study was to determine the alteration in the molecular weight range of HA as a result mechanical deformation loaded on the chondrocytes, as well as the involvement of ROS in this action. ROS were generated via the oxidation of hypoxanthine by xanthine oxidase. Cyclic tensile stretch was loaded using a vacuum-operated instrument (FX-3000). Levels of HA were measured using a sandwich enzyme-binding assay. Superoxide dismutase (SOD) activity, catalysing the dismutation of superoxide anion into hydrogen peroxide, and ROS were measured using water-soluble tetrazolium and a chemiluminescent probe, respectively. ROS depolymerized HA molecules. Cyclic tensile strech depolymerized HA and induced ROS. SOD inhibited not only ROS induction but also HA depolymerization caused by the mechanical stress. These data suggest that ROS play an important role in mechanical stress-induced HA depolymerization. Depolymerized HA may stimulate synovial proliferation and activate synovial inflammation.
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