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Can Membrane Potential Function as a Morphogen in Fish Fin Morphogenesis?

Research Project

Project/Area Number 20K06655
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 44020:Developmental biology-related
Research InstitutionOsaka University

Principal Investigator

Aramaki Toshihiro  大阪大学, 大学院生命機能研究科, 特任研究員(常勤) (30525340)

Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2021: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Keywords細胞膜電位 / サイズスケーリング / 光遺伝学 / 形態形成
Outline of Research at the Start

ゼブラフィッシュ変異体の解析から、魚類の付属肢(ヒレ)の形態制御にはイオンチャネルを介した機構が関与していることが示唆されている。しかしながら、その作用メカニズムについてはほとんどわかっていない。申請者はこれまでの解析から、表皮細胞間で膜電位が伝達することによりモルフォゲン様に位置情報として機能している可能性を見出した。光遺伝学を利用して表皮細胞膜電位を人為的に操作する技術を開発し、膜電位の変動を可視化する技術と組み合わせてこの仮説を検証する。また、開発した膜電位操作技術を応用し、膜電位の変動が表皮細胞、または他の細胞種に及ぼす影響や、その作用メカニズムの特定を試みる。

Outline of Final Research Achievements

In this study, we introduced an optogenetics tool, channelrhodopsin which used in neuroscience research field, into zebrafish epidermal cells. Artificial membrane potential manipulation successfully altered the fin morphology, demonstrating that zebrafish fin elongation (growth) is regulated by the membrane potential of epidermal cells. Additionally, we developed a live imaging system for adult zebrafish to observe the endogenous membrane potential dynamics of epidermal cells. Calcium imaging with GCaMP reporter revealed the existence of rapid signal transmission mechanisms between epidermal cells.

Academic Significance and Societal Importance of the Research Achievements

これまで変異体の解析などから細胞膜電位が形態の制御にも関与していることが示唆されていたが、本研究でそれを実験的に証明し、表皮細胞の膜電位の増減によってヒレの伸長が制御されていることを示した。本研究で確立したチャネルロドプシンを用いた実験系は他種の細胞でも容易に利用可能であり、今度は同様の実験系を用いて神経・筋以外の細胞における膜電位の機能解析が大いに進むと期待される。

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

    (7 results)

All 2024 2023 2022 2021 2020

All Journal Article (2 results) (of which Open Access: 2 results,  Peer Reviewed: 1 results) Presentation (5 results)

  • [Journal Article] Independent size regulation of bones and appendages in zebrafish2024

    • Author(s)
      Aramaki Toshihiro、Kondo Shigeru
    • Journal Title

      bioRxiv

      Volume: -

    • DOI

      10.1101/2024.03.27.587111

    • Related Report
      2023 Annual Research Report
    • Open Access
  • [Journal Article] The Physical Role of Mesenchymal Cells Driven by the Actin Cytoskeleton Is Essential for the Orientation of Collagen Fibrils in Zebrafish Fins2020

    • Author(s)
      Kuroda Junpei、Itabashi Takeshi、Iwane Atsuko H.、Aramaki Toshihiro、Kondo Shigeru
    • Journal Title

      Frontiers in Cell and Developmental Biology

      Volume: 8

    • DOI

      10.3389/fcell.2020.580520

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Bioelectrical signal regulates the segmentation pattern of zebrafish fin bones2023

    • Author(s)
      Toshihiro Aramaki
    • Organizer
      The 29th Japanese Medaka and Zebrafish Meeting
    • Related Report
      2023 Annual Research Report
  • [Presentation] Bioelectrical signal regulates the segmentation pattern of zebrafish fin bones2023

    • Author(s)
      Toshihiro Aramaki
    • Organizer
      The 56th Annual Meeting of JSDB
    • Related Report
      2023 Annual Research Report
  • [Presentation] Bioelectrical size regulation of bones and appendages in zebrafish2022

    • Author(s)
      Toshihiro Aramaki
    • Organizer
      54th Annual Meeting of JSDB
    • Related Report
      2022 Research-status Report
  • [Presentation] 魚類ヒレ骨の分節パターンを制御する生体電気シグナル2022

    • Author(s)
      荒巻 敏寛
    • Organizer
      第45回 日本分子生物学会年会
    • Related Report
      2022 Research-status Report
  • [Presentation] Bioelectrical size regulation of bones and appendages in zebrafish2021

    • Author(s)
      Toshihiro Aramaki
    • Organizer
      54th Annual Meeting of JSDB
    • Related Report
      2021 Research-status Report

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

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