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Elucidate the mechanism by which lactate inhibits muscle performance decline.

Research Project

Project/Area Number 20K19567
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 59020:Sports sciences-related
Research InstitutionThe University of Electro-Communications

Principal Investigator

Tanaka Yoshinori  電気通信大学, 大学院情報理工学研究科, 協力研究員 (40791249)

Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2022: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywordsin vivoイメージング / 骨格筋 / ミトコンドリア / 乳酸塩 / カルシウムイオン / 乳酸 / ミトコンドリアCa2+ / 筋疲労 / In vivoイメージング / グルコース / イメージング
Outline of Research at the Start

本研究は,細胞内の乳酸塩を可視化することにより,乳酸が持久的収縮中に生じる筋発揮張力の低下を抑制する機構を解明することを目指す.近年,乳酸は筋発揮張力を維持させるために有効な物質であることが報告されているものの,乳酸がどのようにして筋発揮張力に関与しているのかについては,未だに議論がなされている.そこで本研究では,独自に開発した生体内 バイオイメージング技法により,乳酸を継時的にかつ筋線維毎に可視化することで,筋収縮中における乳酸と筋発揮張力維持の関係性を解明する.これにより,筋収縮中及び,筋収縮後のエネルギー利用及び,筋発揮張力の向上を目的とした乳酸補給という新たな乳酸の利用法を提言する.

Outline of Final Research Achievements

In recent years, lactate, which is produced during metabolic activity in skeletal muscle, has been considered to contribute to the maintenance of muscle performance rather than contributing to fatigue. In this study, a model was developed to visualise changes in lactate concentration during exercise using lactate-sensitive fluorescent proteins. The results demonstrated that lactate concentration dynamics differed between muscle fibre types during high-intensity muscle contraction. Furthermore, we examined the role of mitochondria in skeletal muscle during muscle contraction. Mitochondria play an essential role in lactate metabolism, and our findings suggest that changes in mitochondrial Ca2+ concentration during contraction directly influence muscle tension level.

Academic Significance and Societal Importance of the Research Achievements

本研究において確立されたバイオイメージング手法は,ホメオスタシスを維持して細胞内イオン動態の観察を可能とした.このモデルを用いて筋収縮活動時の乳酸動態とミトコンドリアCa2+動態の観察に成功した.乳酸とCa2+の細胞内での振る舞いは筋収縮の制御機構の中心であり,筋疲労の機構を解明するために特に重要である.また,本研究の研究モデルや知見は,エイジングならびに糖尿病などの代謝性疾患に付随する筋機能低下の機構解明などにも応用が期待される.

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (10 results)

All 2024 2023 2022 2021 2020

All Journal Article (5 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 4 results,  Open Access: 1 results) Presentation (5 results)

  • [Journal Article] In vivo heat production dynamics during a contraction-relaxation cycle in rat single skeletal muscle fibers2024

    • Author(s)
      Tabuchi Ayaka、Tanaka Yoshinori、Horikawa Hiroshi、Tazawa Takuto、Poole David C.、Kano Yutaka
    • Journal Title

      Journal of Thermal Biology

      Volume: 119 Pages: 103760-103760

    • DOI

      10.1016/j.jtherbio.2023.103760

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] In vivo cytosolic H<sub>2</sub>O<sub>2</sub> changes and Ca<sup>2+</sup> homeostasis in mouse skeletal muscle2024

    • Author(s)
      Kano Ryotaro、Tabuchi Ayaka、Tanaka Yoshinori、Shirakawa Hideki、Hoshino Daisuke、Poole David C.、Kano Yutaka
    • Journal Title

      American Journal of Physiology-Regulatory, Integrative and Comparative Physiology

      Volume: 326 Issue: 1 Pages: R43-R52

    • DOI

      10.1152/ajpregu.00152.2023

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] In vivo環境下におけるマウス骨格筋ミトコンドリア内Ca2+動態の可視化2023

    • Author(s)
      田中 嘉法,田渕 絢香, 白川 英樹, 狩野 豊
    • Journal Title

      月刊細胞

      Volume: 55 Pages: 59-62

    • Related Report
      2022 Research-status Report
  • [Journal Article] Ryanodine receptors mediate high intracellular Ca 2+ and some myocyte damage following eccentric contractions in rat fast-twitch skeletal muscle2022

    • Author(s)
      Ayaka Tabuchi, Yoshinori Tanaka, Ryo Takagi, Hideki Shirakawa, Tsubasa Shibaguchi, Takao Sugiura, David C Poole, Yutaka Kano
    • Journal Title

      American Journal of Physiology Regulatory Integrative and Comparative Physiology

      Volume: 322 Issue: 1 Pages: 14-27

    • DOI

      10.1152/ajpregu.00166.2021

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] In vivo Ca2+ dynamics during cooling after eccentric contractions in rat skeletal muscle.2021

    • Author(s)
      Takagi R, Tabuchi A, Asamura T, Hirayama S, Ikegami R, Tanaka Y, Hoshino D, Poole DC, Kano Y.
    • Journal Title

      Am J Physiol Regul Integr Comp Physiol.

      Volume: 320(2) Issue: 2 Pages: R129-R137

    • DOI

      10.1152/ajpregu.00253.2020

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Sex difference of mitochondrial Ca2+ dynamics in mouse during muscle contraction in the in vivo environment2023

    • Author(s)
      田中 嘉法,田渕 絢香, 白川 英樹, 狩野 豊
    • Organizer
      第100回日本生理学会
    • Related Report
      2022 Research-status Report
  • [Presentation] In vivo環境下における筋収縮負荷時のマウスミトコンドリア内Ca2+動態の可視化2022

    • Author(s)
      田中 嘉法,田渕 絢香, 白川 英樹, 狩野 豊
    • Organizer
      第77回日本体力医学会
    • Related Report
      2022 Research-status Report
  • [Presentation] 連続的な筋収縮負荷による筋細胞内グルコース動態の特徴2021

    • Author(s)
      田中 嘉法,池上 諒2,秋本 崇之,狩野 豊
    • Organizer
      第76回 日本体力医学会
    • Related Report
      2021 Research-status Report
  • [Presentation] 持続的な筋収縮における細胞外の高濃度乳酸の影響2020

    • Author(s)
      田中 嘉法,狩野 豊
    • Organizer
      第75回日本体力医学会
    • Related Report
      2020 Research-status Report
  • [Presentation] 運動誘発性の損傷骨格筋特異的なカルシウムイオン変動パターン2020

    • Author(s)
      田渕 絢香,田中 嘉法,高木 領,白川 英樹,狩野 豊
    • Organizer
      第75回日本体力医学会
    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2025-01-30  

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