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The structure and formation mechanism of the contractile ring by super-resolution imaging

Research Project

Project/Area Number 21K06253
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 44040:Morphology and anatomical structure-related
Research InstitutionTohoku Medical and Pharmaceutical University

Principal Investigator

Kamijo Keiju  東北医科薬科大学, 医学部, 教授 (10252074)

Project Period (FY) 2021-04-01 – 2025-03-31
Project Status Completed (Fiscal Year 2024)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords収縮環 / アクチン / ミオシン / Rho / 超解像顕微鏡 / 細胞質分裂
Outline of Research at the Start

哺乳動物細胞の収縮環の構造および形成機構をナノスケールレベルで明らかにする.このため,以下のような研究を行う.
① 収縮環の構造の解明:解像限界からよくわかっていないアクチンとミオシンIIのフィラメントの向きや配列を超解像顕微鏡観察で明らかにし,収縮環の構造を解明する.
② 収縮環形成過程をライブイメージングで解明する:高速で画像取得が可能な超解像スピニングディスク顕微鏡を用いて,細胞質分裂の超解像ライブイメージング法を確立し,これにより収縮環形成過程を明らかにする.
③ 収縮環形成の分子機構:Rhoシグナル分子を標的としたRNAiやゲノム編集,阻害剤処理を行い収縮環形成の分子機構を明らかにする.

Outline of Final Research Achievements

In animal cells, cleavage of the cell by contraction of the contractile ring promotes cytokinesis, leading to the completion of cell division. The contractile ring is composed of actin and myosin filaments; however, its structure and the assembly mechanism remain unclear. In this study, we analyzed the structure and the assembly mechanism of the contractile ring observed by super-resolution microscopy, using fixed specimens as well as live cells. Our results showed that actin and myosin filaments are independently formed de novo at the equatorial region under the control of Rho signaling, and that myosin filaments crosslink actin filaments, leading to self-organization of the contractile ring parallel to the equatorial plane.

Academic Significance and Societal Importance of the Research Achievements

超解像顕微鏡を用いることで,これまでよくわかっていなかった動物細胞の収縮環の構造を明らかにした.さらに,収縮環の形成機構を超解像顕微鏡によるライブイメージングで明らかにした.生体にはストレスファイバーや骨格筋といった多くの収縮装置があるが,収縮機構に比べ,収縮装置の形成機構はよくわかっていない.本研究が明らかにした収縮環形成機構は生体における収縮装置形成の良いモデルとなると考えられる.また,収縮環形成の機構の解明により,細胞質分裂をターゲットとした抗がん剤の開発などに寄与することが期待される.

Report

(5 results)
  • 2024 Annual Research Report   Final Research Report ( PDF )
  • 2023 Research-status Report
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (2 results)

All 2024 2023

All Journal Article (2 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 2 results,  Open Access: 2 results)

  • [Journal Article] Radiation-induced Cell Death: Relevance to Cancer Cell Radioresistance2024

    • Author(s)
      Yoshikazu Kuwahara, Miyu Kitamura, Kazuo Tomita, Tadanori Muraoka, Tomoka Chida, Mehryar Habibi Roudkenar, Amaneh Mohammadi Roush, Tomoaki Sato, Keiju Kamijo, Akihiro Kurimasa
    • Journal Title

      Radiation Environment and Medicine

      Volume: 13 Issue: 1 Pages: 1-9

    • DOI

      10.51083/radiatenvironmed.13.1_1

    • ISSN
      2423-9097, 2432-163X
    • Year and Date
      2024-02-28
    • Related Report
      2023 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Chronic encephalomyelitis virus exhibits cellular tropism and evades pDCs by binding to sialylated integrins as the cell surface receptors2023

    • Author(s)
      Takeda Kazuya、Kaifu Tomonori、Michihata Ryunosuke、Kinugawa Naotaka、Fujioka Atushi、Tateno Ayaka、Toshima Kaoru、Kanoh Hirotaka、Inamori Kei‐Ichiro、Kamijo Keiju、Himeda Toshiki、Ohara Yoshiro、Inokuchi Jin‐Ichi、Nakamura Akira
    • Journal Title

      European Journal of Immunology

      Volume: 53 Issue: 10 Pages: 1-14

    • DOI

      10.1002/eji.202350452

    • Related Report
      2023 Research-status Report
    • Peer Reviewed / Open Access

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Published: 2021-04-28   Modified: 2026-01-16  

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