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Elucidation of the qualitative regulatory mechanism of skeletal muscle and its application to overcoming sarcopenia

Research Project

Project/Area Number 19K19945
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 59020:Sports sciences-related
Research InstitutionNagoya Institute of Technology

Principal Investigator

Ato Satoru  名古屋工業大学, 工学(系)研究科(研究院), 特別研究員(ポスドク) (20825731)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywords骨格筋 / 老化 / 筋収縮 / Desmin / 筋核 / 加齢 / 筋肥大 / 骨格筋肥大
Outline of Research at the Start

本研究は加齢による骨格筋の質的低下の機序の解明と効率的な改善施策の開発を目的とし、骨格筋機能の生理変化に対する筋核の役割を検討する。このため、実験動物を用いて加齢による筋機能の低下に対する筋核の数的・形態学的変化の関与を観察学的手法と遺伝子工学的手法を用いて明らかにする。
さらに、基礎的検討の知見に基づき加齢による骨格筋機能低下に対する効率的な骨格筋機能の改善方法の検討を実験動物を対象に実施する。

Outline of Final Research Achievements

This study was undertaken to elucidate the mechanisms of skeletal muscle contractile dysfunction associated with aging and to overcome this problem through its application. It is known that Desmin, a muscle-specific intermediate diameter filament, is involved in the retention of skeletal muscle cell nuclei to the cell periphery and in muscle contractile function. Since accumulation of Desmin in skeletal muscle cells occurs with aging and an increase in the number of central nuclei has been observed in skeletal muscle, we hypothesized that the accumulation of Desmin is associated with the loss of muscle contractile function with aging. We overexpressed Desmin in mouse skeletal muscle and examined its effects on skeletal muscle mass and contractile function, and found that accumulation due to forced Desmin expression reduced skeletal muscle mass without affecting muscle contractile function.

Academic Significance and Societal Importance of the Research Achievements

本研究は老化に伴う骨格筋収縮機能低下の機序解明とその応用による克服を目指した。骨格筋の中間径フィラメントDesminは骨格筋細胞核の細胞周囲への保持や筋収縮機能に関わっていることが知られている。骨格筋細胞では老化に伴い筋内へDesminの蓄積が生じることや、核が異常な局在を示すことから、Desminの蓄積が筋収縮機能低下と関連する可能性が考えられた。我々はマウス骨格筋へDesminの過剰発現を行い、骨格筋量と筋収縮機能に及ぼす影響の検討を行いDesminの蓄積が筋収縮機能に影響を及ぼさないものの、骨格筋量を低下させる因子であることを明らかにした。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (5 results)

All 2022 2021 2020

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (2 results)

  • [Journal Article] Implication of satellite cell behaviors in capillary growth via VEGF expression-independent mechanism in response to mechanical loading in HeyL-null mice2022

    • Author(s)
      Ato Satoru、Fukada So-ichiro、Kokubo Hiroki、Ogasawara Riki
    • Journal Title

      American Journal of Physiology-Cell Physiology

      Volume: 322 Issue: 2 Pages: C275-C282

    • DOI

      10.1152/ajpcell.00343.2021

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] The relationship between myonuclear number and protein synthesis in individual rat skeletal muscle fibre2021

    • Author(s)
      Ato Satoru、Ogasawara Riki
    • Journal Title

      Journal of Experimental Biology

      Volume: - Issue: 10 Pages: 242496-242496

    • DOI

      10.1242/jeb.242496

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Response of Resistance Exercise-Induced Muscle Protein Synthesis and Skeletal Muscle Hypertrophy Are Not Enhanced After Disuse Muscle Atrophy in Rat2020

    • Author(s)
      Ato Satoru、Kido Kohei、Sase Kohei、Fujita Satoshi
    • Journal Title

      Frontiers in Physiology

      Volume: 11 Pages: 469-469

    • DOI

      10.3389/fphys.2020.00469

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] マウス腓腹筋におけるDesmin過剰発現が筋量と収縮機能に及ぼす影響2021

    • Author(s)
      阿藤聡, 小笠原理紀
    • Organizer
      第76回日本体力医学会大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 骨格筋線維の核数とタンパク質合成の関係性と筋収縮による修飾2021

    • Author(s)
      阿藤聡、小笠原理紀
    • Organizer
      第25回日本体力医学会東海学術集会
    • Related Report
      2020 Research-status Report

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Published: 2019-04-18   Modified: 2023-01-30  

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