雄性老化促進マウス (SAMP8) の自然発症型変形性膝関節症に対する低強度運動の効果

• Material Type: 博士論文
• Title: 雄性老化促進マウス (SAMP8) の自然発症型変形性膝関節症に対する低強度運動の効果
• Author/Editor: 則松, 貢輔
• Author Heading: 則松, 貢輔 ノリマツ, コウスケ
• Publication, Distribution, etc.: BMC
• Alternative Title: Effects of low-intensity exercise on spontaneously developed knee osteoarthritis in male senescence-accelerated mouse prone 8
• Degree grantor/type: 鹿児島大学
• Date Granted: 2024-03-13
• Dissertation Number: 甲保研第39号
• Degree Type: 博士(保健学); Doctor of Philosophy in Health Science
• Text Language Code: eng
• Subject Heading: Aging; Osteoarthritis; Exercise; Rehabilitation; Mouse model; Synovial inflammation; M1 macrophage
• Target Audience: 一般
• Note (General): 博士論文全文, 博士論文要旨, 最終試験結果の要旨, 論文審査の要旨; Background: Osteoarthritis (OA) is a degenerative joint disease associated with aging, which often leads to joint stiffness and disability. Exercise is one of the most important non-pharmacological treatments and is prescribed as an indispensable treatment for OA. However, whether physical exercise is beneficial for preventing the progression of OA symptoms with age is poorly understood. We investigated the effects of exercise on spontaneously developed knee OA using male senescence-accelerated mouse prone 8 (SAMP8). Methods: To examine age-related changes in the knee joints of SAMP8, knee articular cartilage changes, synovitis, knee joint flexion and extension angles, swelling, walking ability, and quadriceps muscle atrophy were analyzed at 3, 5, 7, and 9 months. SAMP8 were required to run at a speed of 10 m/min for 15 min/day from 7 to 9 months of age. The knee joint pathologies and symptoms of exercising and non-exercising mice were compared by histological, immunohistochemical, and morphometrical analyses. Results: The mice presented with various histological changes, including cartilage destruction, osteocyte formation, synovitis, declined joint angles, and swelling. Notably, medial and posterior cartilage destruction was more severe than that of the lateral and anterior cartilage. Knee joint angles were significantly correlated with the histological scores (modified Mankin and OARSI, osteophyte formation and synovial lining cell layer). Exercise did not attenuate cartilage degeneration in the medial and posterior tibial plateau, although the articular cartilage of the anterior and lateral tibial plateau and its histological scores was remained and significantly improved, respectively, by exercise. Exercise suppressed the age-related decline of collagen type II-positive areas in the remaining articular cartilage and improved the OA symptoms. Exercise reduced the expression of monocyte chemoattractant protein (MCP)-1 and tumor necrosis factor (TNF)-α positive macrophages in the synovium. Conclusion: This study revealed that SAMP8 developed spontaneous knee OA with age, which resembled the disease symptoms in humans. Low-intensity exercise temporarily alleviated degeneration of the remaining cartilage, synovitis, and age-related decreases in knee flexion angle, stride length, and muscle atrophy in SAMP8. However, exercise during OA progression with age may cause mechanical stress that could be both beneficial and detrimental to joint health. Kosuke Norimatsu, Kazuki Nakanishi, Toshiro Ijuin, Shotaro Otsuka, Seiya Takada, Akira Tani, Ryoma Matsuzaki, Teruki Matsuoka & Harutoshi Sakakima Effects of low-intensity exercise on spontaneously developed knee osteoarthritis in male senescence-accelerated mouse prone 8 Norimatsu et al. Arthritis Research & Therapy (2023) 25:168 https://doi.org/10.1186/s13075-023-03162-z
• Format (IMT): application/pdf
• Source: Diss_則松貢輔_HOK039_2023 （fulltext）; https://ir.kagoshima-u.ac.jp/record/2000173/files/Diss_%E5%89%87%E6%9D%BE%E8%B2%A2%E8%BC%94_HOK039_2023.pdf
• Access Restrictions: インターネット公開
• Data Provider (Database): 国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）; https://irdb.nii.ac.jp
• Original Data Provider (Database): 鹿児島大学 : 鹿児島大学リポジトリ