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Examination of sarcopenic animal models focusing on the proteolytic system

Research Project

Project/Area Number 21K19720
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 InstitutionHiroshima University

Principal Investigator

Kitajima Yasuo  広島大学, 医系科学研究科(医), 助教 (70734416)

Project Period (FY) 2021-07-09 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2023: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2022: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywords骨格筋 / 筋再生 / タンパク分解系 / 老化 / 筋線維 / タンパク分解 / 筋幹細胞 / 筋萎縮 / サルコペニア
Outline of Research at the Start

日本は世界でも前例がないほどのスピードで高齢化が進行している。高齢社会の進行においてサルコペニア(加齢に伴う筋萎縮)に伴う運動機能低下は多くの要介護者を生み、健康寿命を短縮する重大な問題につながる。そのような背景の元、サルコペニアを代表とする骨格筋萎縮に関して、未だ確固たる解決策には至っていない。そこで本研究は、これまでにない新しいサルコペニアモデルマウスを創出することをめざす。本研究成果は、骨格筋の基礎研究に広く使用できるツールになり、サルコペニアの改善や疾患による筋萎縮の治療など健康科学分野への貢献につながる。

Outline of Final Research Achievements

The aim of this study is to generate mice that can undergo muscle-specific proteasome dysfunction at any given time and to elucidate its effects on skeletal muscle homeostasis mechanisms. After individual maturation, skeletal muscle proteasome dysfunction in mice inhibited proteasome-mediated proteolysis, leading to muscle atrophy and reduced myofiber size. Furthermore, proteasome dysfunction was associated with necrotic cells and inflammatory cell infiltration, suggesting a link to disease. In the future, the relationship between muscle proteasome dysfunction and aging and disease should be further investigated. We expect that further elucidation of this relationship will help to elucidate one aspect of the normal homeostatic mechanism of skeletal muscle.

Academic Significance and Societal Importance of the Research Achievements

本研究では、成体骨格筋におけるプロテアソーム機能不全が筋萎縮を引き起こすことを、マウスモデルで実証した。個体成熟後の骨格筋プロテアソーム機能不全マウスでは、プロテアソームを介したタンパク質分解が阻害され、筋萎縮と筋線維のサイズの減少を引き起こした。本研究成果は、筋量を維持するためには正常なプロテアソーム機能が重要であることを示し、タンパク分解系による骨格筋研究の更なる発展につながる可能性がある。

Report

(3 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • Research Products

    (6 results)

All 2023 2022 2021 2020

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

  • [Journal Article] Structural basis of spike RBM-specific human antibodies counteracting broad SARS-CoV-2 variants2023

    • Author(s)
      Kiyomi Shitaoka, Akifumi Higashiura, Yohei Kawano, Akima Yamamoto, Yoko Mizoguchi, Takao Hashiguchi , Norihisa Nishimichi, Shiyu Huang, Ayano Ito, Shun Ohki, Miyuki Kanda, Tomohiro Taniguchi, Rin Yoshizato, Hitoshi Azuma, Yasuo Kitajima, Yasuyuki Yokosaki, Satoshi Okada, Takemasa Sakaguchi, Tomoharu Yasuda
    • Journal Title

      Communications Biology

      Volume: 6 Issue: 1 Pages: 1-14

    • DOI

      10.1038/s42003-023-04782-6

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The aminopeptidase LAP3 suppression accelerates myogenic differentiation via the AKT‐TFE3 pathway in C2C12 myoblasts2023

    • Author(s)
      Osana Shion、Kitajima Yasuo、Naoki Suzuki、Murayama Kazutaka、Takada Hiroaki、Tabuchi Ayaka、Kano Yutaka、Nagatomi Ryoichi
    • Journal Title

      Journal of Cellular Physiology

      Volume: 238 Issue: 9 Pages: 2103-2119

    • DOI

      10.1002/jcp.31070

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Hoxa10 mediates positional memory to govern stem cell function in adult skeletal muscle.2021

    • Author(s)
      Yoshioka K, Nagahisa H, Miura F, Araki H, Kamei Y, Kitajima Y, Seko D, Nogami J, Tsuchiya Y, Okazaki N, Yonekura A, Ohba S, Sumita Y, Chiba K, Ito K, Asahina I, Ogawa Y, Ito T, Ohkawa Y, Ono Y.
    • Journal Title

      Sci Adv.

      Volume: 7 Issue: 24

    • DOI

      10.1126/sciadv.abd7924

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Puromycin‐sensitive aminopeptidase is required for C2C12 myoblast proliferation and differentiation2020

    • Author(s)
      Osana Shion、Kitajima Yasuo、Suzuki Naoki、Nunomiya Aki、Takada Hiroaki、Kubota Takahiro、Murayama Kazutaka、Nagatomi Ryoichi
    • Journal Title

      Journal of Cellular Physiology

      Volume: 236 Issue: 7 Pages: 5293-5305

    • DOI

      10.1002/jcp.30237

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 骨格筋幹細胞の維持と免疫細胞による筋再生機構2023

    • Author(s)
      北嶋康雄
    • Organizer
      第38回筋肉の会
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Book] 健康寿命の鍵を握る骨格筋2022

    • Author(s)
      北嶋 康雄
    • Total Pages
      227
    • Publisher
      羊土社
    • ISBN
      9784758104005
    • Related Report
      2021 Research-status Report

URL: 

Published: 2021-07-13   Modified: 2025-01-30  

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