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Toll receptor signaling mediated epigenetic regulation of blastema formation gene expression in the cricket Gryllus bimaculatus

Research Project

Project/Area Number 21K06121
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 43050:Genome biology-related
Research InstitutionOkayama University

Principal Investigator

Bando Tetsuya  岡山大学, 医歯薬学域, 講師 (60423422)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
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: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Keywordsコオロギ / 再生 / 再生芽細胞 / マクロファージ / 活性酸素 / Toll受容体シグナル / オートファジー / エピゲノム / Toll様受容体 / 昆虫
Outline of Research at the Start

ヒトが手や足を失うと再生できないが、昆虫や両生類など多くの生物が付属肢を再生できる。申請者はコオロギの脚再生過程を解析し、マクロファージに発現するToll様受容体(TLR)が再生に必要であることを発見した。コオロギの脚再生において、TLRシグナルが標的遺伝子の発現をエピジェネティックに制御するメカニズムを解析することで、器官再生の促進機構とその普遍性を明らかにする。

Outline of Final Research Achievements

When the legs of the cricket Gryllus bimaculatus are amputated, the lost parts are regenerated through several molts. Toll and scavenger receptors-expressing plasmatocytes, which are the insect macrophages, promote leg regeneration. However, the details of this process remain poorly understood. In order to gain further insight into this process, we analyzed the function of Duox, which is a NADPH oxidase and produces reactive oxygen species (ROS), during regeneration. Crickets subjected to RNAi-mediated knockdown of Duox exhibited hypertrophy in the regenerating legs and exhibited lethal phenotypes during the nymphal stage. In comparison to control crickets, Duox(RNAi) crickets exhibited increased hemocyte migration and altered epidermal cell proliferation. Additionally, the expression of several ligands of Toll receptors was altered in Duox(RNAi) regenerating legs, suggesting that ROS-mediated regulation of Toll signaling may promote proper leg regeneration in the crickets.

Academic Significance and Societal Importance of the Research Achievements

多くの再生可能動物において、器官が傷害されると創傷部位でROS産生が高まり、WntシグナルやJNK, ERKなどを介して器官再生を促進することが知られている。コオロギの脚再生では、Duox(RNAi)によりROSを低下させると、再生脚の肥大や幼虫期致死の表現型が示され、血球遊走の増加と細胞増殖の低下が起こっていた。ROSの低下によりToll受容体のリガンドの発現が変化したことから、ROSはTollシグナルの活性化を介して再生を制御すると考えられる。本研究成果より、器官再生におけるTollシグナルの重要性が深まり、免疫と再生の関連を明らかにできた。

Report

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

    (10 results)

All 2023 2022 2021 Other

All Journal Article (3 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 2 results,  Open Access: 2 results) Presentation (5 results) Remarks (2 results)

  • [Journal Article] Toll signalling promotes blastema cell proliferation during cricket leg regeneration via insect macrophages2022

    • Author(s)
      Tetsuya Bando, Misa Okumura, Yuki Bando, Marou Hagiwara, Yoshimasa Hamada, Yoshiyasu Ishimaru, Taro Mito, Eri Kawaguchi, Takeshi Inoue, Kiyokazu Agata, Sumihare Noji, Hideyo Ohuchi
    • Journal Title

      Development

      Volume: 149(8) Issue: 8 Pages: 1-14

    • DOI

      10.1242/dev.199916

    • Related Report
      2022 Research-status Report 2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Insights into the genomic evolution of insects from cricket genomes2021

    • Author(s)
      Guillem Ylla, Taro Nakamura, Takehiko Itoh, Rei Kajitani, Atsushi Toyoda, Sayuri Tomonari, Tetsuya Bando, Yoshiyasu Ishimaru, Takahito Watanabe, Masao Fuketa, Yuji Matsuoka, Austen A. Barnett, Sumihare Noji, Taro Mito & Cassandra G. Extavour
    • Journal Title

      Communications Biology

      Volume: 4 Issue: 1 Pages: 733-733

    • DOI

      10.1038/s42003-021-02197-9

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] フタホシコオロギが解き明かす免疫と再生の思いがけない関係2021

    • Author(s)
      板東 哲哉, 奥村 美紗, 濱田 良真, 大内 淑代
    • Journal Title

      昆虫と自然

      Volume: 57 Pages: 33-36

    • Related Report
      2021 Research-status Report
  • [Presentation] Regulation of blastema cell proliferation during cricket leg regeneration via reactive oxygen species2023

    • Author(s)
      Misa Okumura, Tetsuya Bando, Hideyo Ohuchi
    • Organizer
      The 56th Annual Meeting of the Japanese Society of Developmental Biologists
    • Related Report
      2023 Annual Research Report
  • [Presentation] マクロファージと活性酸素による昆虫脚再生の制御2022

    • Author(s)
      板東哲哉、奥村美紗、大内淑代
    • Organizer
      日本解剖学会 第76回中国・四国支部学術集会
    • Related Report
      2022 Research-status Report
  • [Presentation] コオロギ脚再生におけるNADPH oxidasesにより産生される活性酸素の役割2022

    • Author(s)
      奥村美紗、板東哲哉、大内淑代
    • Organizer
      第45回日本分子生物学会年会
    • Related Report
      2022 Research-status Report
  • [Presentation] Toll受容体と活性酸素による昆虫の器官再生の制御2022

    • Author(s)
      板東哲哉、奥村美紗、大内淑代
    • Organizer
      第127回日本解剖学会総会・全国学術集会
    • Related Report
      2021 Research-status Report
  • [Presentation] NADPH oxidasesによるコオロギ脚再生の制御メカニズム2021

    • Author(s)
      板東哲哉、奥村美紗、大内淑代
    • Organizer
      第44回日本分子生物学会年会(MBSJ2021)
    • Related Report
      2021 Research-status Report
  • [Remarks] 免疫に働くToll受容体がコオロギの再生を促進するメカニズムを解明

    • URL

      https://www.okayama-u.ac.jp/tp/release/release_id900.html

    • Related Report
      2021 Research-status Report
  • [Remarks] Okayama University Medical Research Updates

    • URL

      https://www.okayama-u.ac.jp/tp/news/news_id11026.html

    • Related Report
      2021 Research-status Report

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Published: 2021-04-28   Modified: 2025-01-30  

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