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Pathophysiology of non-coding repeat expansion disorders

Research Project

Project/Area Number 19K17043
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 52020:Neurology-related
Research InstitutionNara Medical University

Principal Investigator

Shiota Tomo  奈良県立医科大学, 医学部附属病院, 研究員 (70837062)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
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: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
KeywordsALS / 細胞骨格 / 神経難病
Outline of Research at the Start

筋萎縮性側索硬化症(ALS)および前頭側頭型認知症
(FTD)は、分子生物学的な病態が明らかでなく、有効な治療法が無い。近年、ALS/FTD発症の原因としてC9orf72遺伝子の異常な繰返し配列((GGGGCC)n)が報告された。このC9orf72遺伝子異常を伴うALS/FTD(C9-ALS)患者由来の細胞では、PR(プロリン・アルギニン)ポリペプチドを含む病的な毒性ポリペプチドが作られ、その標的がLC(low-complexity)配列を有するタンパク質であることが明らかになってきた。本研究では、この毒性ポリペプチドの解析を通じて、神経変性疾患及び類似疾患を含む神経難病の病態解明を目指す。

Outline of Final Research Achievements

Proline:arginine (PR) poly-dipeptides from the GGGGCC repeat expansion in C9orf72 have cytotoxicity and bind intermediate filaments (IFs). However, it remains unknown how PR poly-dipeptides affect the cytoskeletal organization and focal adhesion (FA) formation. Here, we show that the changes of cytoskeleton and FA by PR poly-dipeptides result in the alteration of cell stiffness and mechanical stress response. PR poly-dipeptides increased the junctions and branches of the IF network, increased cell stiffness, changed the distribution of actin filaments and increased the size of FA. In addition, PR poly-dipeptides or an inhibitor of IF organization prevented the cell detachment. Furthermore, PR poly-dipeptides upregulated mechanical stress response factors and led to a maladaptive response to cyclic stretch. These results suggest that the effects of PR poly-dipeptides on mechanical properties and mechanical stress response may serve as a pathogenesis of C9orf72-related neurodegeneration.

Academic Significance and Societal Importance of the Research Achievements

細胞の機械的特性や機械的ストレス応答は、細胞の恒常性に関与し重要である。しかし、筋萎縮性側索硬化症(ALS)においてこれらがどのように変化しているか不明であった。本研究は、細胞の表面の硬さの変化や機械的ストレス応答の変化が、ALSの病態に関与する可能性があることを始めて明らかにしたもので、ALSの病態解明の一助になると考えられる。

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

  • [Journal Article] C9orf72-Derived Proline:Arginine Poly-Dipeptides Modulate Cytoskeleton and Mechanical Stress Response2022

    • Author(s)
      Shiota Tomo、Nagata Riko、Kikuchi Sotaro、Nanaura Hitoki、Matsubayashi Masaya、Nakanishi Mari、Kobashigawa Shinko、Isozumi Noriyoshi、Kiriyama Takao、Nagayama Kazuaki、Sugie Kazuma、Yamashiro Yoshito、Mori Eiichiro
    • Journal Title

      Frontiers in Cell and Developmental Biology

      Volume: 10 Pages: 750829-750829

    • DOI

      10.3389/fcell.2022.750829

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] C9orf72- derived proline:arginine poly-dipeptides disturb cytoskeletal architecture2020

    • Author(s)
      Tomo Shiota
    • Journal Title

      BioRxiv

      Volume: -

    • DOI

      10.1101/2020.10.14.338566

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] C9orf72-Derived Proline:Arginine Poly-Dipeptides Alter Cytoskeleton and Mechanical Stress Response2022

    • Author(s)
      Tomo Shiota
    • Organizer
      第63回日本神経学会
    • Related Report
      2021 Annual Research Report
  • [Presentation] PR poly-dipeptides derived from the C9orf72 repeat expansion interfere with cytoskeletal architecture2021

    • Author(s)
      Tomo Shiota
    • Organizer
      第62回日本神経学会
    • Related Report
      2021 Annual Research Report
  • [Presentation] C9orf72- derived proline:arginine poly-dipeptides interfere with cytoskeletal architecture2021

    • Author(s)
      Tomo Shiota
    • Organizer
      日本神経学会
    • Related Report
      2020 Research-status Report

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

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