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Role of hypoxia-sensitive neurons in promoting the exercise effects on bone with metabolic bone disorders

Research Project

Project/Area Number 20K21764
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 59:Sports sciences, physical education, health sciences, and related fields
Research InstitutionNational Institute of Fitness and Sports in Kanoya

Principal Investigator

TAMAKI HIROYUKI  鹿屋体育大学, スポーツ生命科学系, 教授 (40253926)

Co-Investigator(Kenkyū-buntansha) 荻田 太  鹿屋体育大学, スポーツ生命科学系, 教授 (50224134)
Project Period (FY) 2020-07-30 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥6,110,000 (Direct Cost: ¥4,700,000、Indirect Cost: ¥1,410,000)
Fiscal Year 2021: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2020: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Keywords骨組織 / 神経 / マイクロCT / 骨 / 低酸素 / 水中運動 / 環境 / 骨代謝
Outline of Research at the Start

本研究課題では、低強度の運動でも効果が得られるよう骨組織側の運動刺激に対する反応性を高める手法について検証する。特に、骨代謝が低調となっている高齢期モデル動物を対象に、低酸素環境を用いてローインパクトな運動でも骨量改善効果の創出に挑戦し、その効果発現機序の一端を低酸素刺激感受性イオンチャネル(TRPA1)を有する神経をターゲットに明らかにする。骨組織の微細構造分析や強度検査、組織細胞レベルで検証評価する。

Outline of Final Research Achievements

Mechanical stimulation such as exercise is effective in maintaining bone mass, but its effect is diminished in bone tissue with metabolic abnormalities and/or in old age. To overcome this dilemma, we examined the osteogenic effects of low-intensity exercise under a hypoxic environment and investigated the role of hypoxia-sensitive neurons innervating bone tissue to maintain bone mass in diabetic aged rats. Low-intensity exercise (swimming) interventions under hypoxic conditions resulted in higher bone mass in the diabetic tibia than that under normoxic conditions. Second, pharmacological inhibition of hypoxia-sensitive neurons caused significant bone loss. Our results suggest that an external environment during exercise (hypoxic environment) that activates the neurons innervating bone tissue, even with low-intensity exercise stimulation, may enhance the effect of exercise on the maintenance of bone mass in metabolic abnormalities.

Academic Significance and Societal Importance of the Research Achievements

本研究は運動する外的環境を調整することでその効果の現れ方を最大限引き出そうとする取り組みであり、得られた結果は、骨代謝異常を有する骨組織において低酸素環境での有効性を示唆した。このことは高齢期や骨代謝異常であっても、力学的強度が低い運動でも骨量維持に有効であり、外的環境を工夫することで骨折リスクが高いケースでの運動処方にも活用できる可能性がある。またこの効果創出に骨内支配する酸素感受性神経が関連している可能性が示されたことは、神経系をターゲットとした新たな療法開発など各分野に波及するポテンシャルを有する。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (7 results)

All 2022 2021 2020

All Presentation (7 results) (of which Int'l Joint Research: 3 results)

  • [Presentation] Bone-strain characteristics of tibiae during mechanical loading at different intensities in young and middle-aged to old rats.2022

    • Author(s)
      Tamaki H, Nakagawa K, Oga R, Yoshizuka Y, Nishiyama H, Yokota K, Yotani K
    • Organizer
      Journal of Physical Fitness and Sports Medicine
    • Related Report
      2022 Annual Research Report
  • [Presentation] Effects of hypobaric swimming training on trabecular bone volume and structure in old type 2 diabetic rats.2022

    • Author(s)
      Tamaki H, Yotani K, Ogita F,
    • Organizer
      49th Annual Meeting of European Calcified Tissue Society Congress
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] In vivo bone strain environment of rat tibia during eccentric, concentric and isometric contractions induced by electrical stimulation.2021

    • Author(s)
      Tamaki H, Yotani K, Ogita F,
    • Organizer
      2021 Annual Meeting of American Society for Bone and Mineral Research
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] 坐骨神経及びカプサイシン感受性神経のdenervationがラット脛骨骨梁構造に及ぼす影響.2021

    • Author(s)
      田巻弘之, 與谷謙吾, 荻田 太
    • Organizer
      第76回日本体力医学会大会
    • Related Report
      2021 Research-status Report
  • [Presentation] 低圧低酸素環境下における短時間高強度インターバル運動が身体組成、血中脂質、耐糖能に及ぼす影響2021

    • Author(s)
      荻田 太, 與谷謙吾, 田巻弘之
    • Organizer
      第28回日本運動生理学会大会
    • Related Report
      2020 Research-status Report
  • [Presentation] Effects of bone strain of rat tibia during electrical stimulation-induced muscle contraction on bone strength in the early stages of disuse musculoskeletal atrophy.2020

    • Author(s)
      Tamaki H, Yotani K, Ogita F,
    • Organizer
      2020 Annual Meeting of American Society for Bone and Mineral Research
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] 電気刺激誘発性筋収縮時の収縮様式の違いによるラット脛骨のひずみ特性.2020

    • Author(s)
      田巻弘之, 與谷謙吾, 荻田 太,
    • Organizer
      第75回日本体力医学会大会,
    • Related Report
      2020 Research-status Report

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Published: 2020-08-03   Modified: 2024-01-30  

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