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Elucidation of mitochondrial degradation mechanisms and their application to drug development for heart failure

Research Project

Project/Area Number 21H02913
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 53020:Cardiology-related
Research InstitutionNational Cardiovascular Center Research Institute

Principal Investigator

Kinya Otsu  国立研究開発法人国立循環器病研究センター, 病院, 理事長 (20294051)

Co-Investigator(Kenkyū-buntansha) 種池 学  大阪大学, 大学院医学系研究科, 講師 (30609756)
山口 修  大阪大学, 大学院医学系研究科, 招へい教授 (90467580)
Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥17,290,000 (Direct Cost: ¥13,300,000、Indirect Cost: ¥3,990,000)
Fiscal Year 2023: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
Fiscal Year 2022: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2021: ¥5,980,000 (Direct Cost: ¥4,600,000、Indirect Cost: ¥1,380,000)
Keywordsミトコンドリア / 心不全 / 炎症 / DNA分解 / マイトファジー / DNAメチル化 / 心筋炎症
Outline of Research at the Start

我が国を含む先進国における主要死因の一つが心不全であり、新規治療法の開発が求められている。心不全の発症進展において無菌性炎症は重要な役割を果たす。障害ミトコンドリア由来の活性酸素種産生や、強い炎症惹起性を持つミトコンドリアDNAを介して、ミトコンドリアは心不全における無菌性炎症の起点となる。ミトコンドリアの品質維持を担うマイトファジーやミトコンドリアDNAのメチル化制御機構は、炎症の抑制的制御に重要な役割を持つ。本研究では、これらの分子機構を解明し、心不全病態における無菌性炎症を制御し、新規治療法に繋げることを目指す。

Outline of Final Research Achievements

In this study, we aimed to elucidate the molecular mechanisms of mitophagy which is responsible for mitochondrial quality control, the methylation control mechanism of mitochondrial DNA, and subsequent inflammation, in order to develop the nobel treatment of heart failure. We demonstrated that Bcl2-L-13 mediates mitophagy and mitochondrial fission under pressure overload in the heart, indicating its importance in the cardiac stress response. In addition, we successfully detected changes in methylation in pressure-overloaded hearts, concerning the methylation control mechanism of mitochondrial DNA. In terms of mitochondrial DNA degradation, we identified microRNAs that suppress a DNA-degrading enzyme and conducted experiments involving oligo DNA administration to heart failure model mice.

Academic Significance and Societal Importance of the Research Achievements

ミトコンドリア分解不全により、心筋細胞内にミトコンドリア(mt)DNAが蓄積することで炎症が惹起され、心不全発症につながると考えられている。本研究では、圧負荷心において障害ミトコンドリア分解に関わるBcl2-L-13が恒常性維持に重要であることや、mtDNAのメチル化に変化がおこることを示し、心不全治療の標的になりうる可能性を示した。また、DNA分解酵素を負に制御するmicroRNAを、DNAオリゴ製剤の標的として投与実験を行い、基礎的データを取得できた。これらは、ミトコンドリア分解のメカニズム解明という学術的意義のみでなく、今後、新規心不全治療薬を開発するうえで非常に有意義な成果である。

Report

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

    (11 results)

All 2023 2022 2021 Other

All Int'l Joint Research (4 results) Journal Article (2 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 2 results,  Open Access: 2 results) Presentation (5 results) (of which Int'l Joint Research: 1 results,  Invited: 5 results)

  • [Int'l Joint Research] King's College London(英国)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] King's College London(英国)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] King's College London/Imperial College London(英国)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] Indiana University School of Medicine(米国)

    • Related Report
      2021 Annual Research Report
  • [Journal Article] Rubicon-regulated beta-1 adrenergic receptor recycling protects the heart from pressure overload2022

    • Author(s)
      Akazawa Yasuhiro、Taneike Manabu、Ueda Hiromichi、Kitazume-Taneike Rika、Murakawa Tomokazu、Sugihara Ryuta、Yorifuji Hiroki、Nishida Hiroki、Mine Kentaro、Hioki Ayana、Omiya Shigemiki、Nakayama Hiroyuki、Yamaguchi Osamu、Yoshimori Tamotsu、Sakata Yasushi、Otsu Kinya
    • Journal Title

      Scientific Reports

      Volume: 12 Issue: 1 Pages: 41-41

    • DOI

      10.1038/s41598-021-03920-6

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] NF-κB activation in cardiac fibroblasts results in the recruitment of inflammatory Ly6C <sup>hi</sup> monocytes in pressure-overloaded hearts2021

    • Author(s)
      Abe Hajime、Tanada Yohei、Omiya Shigemiki、Podaru Mihai-Nicolae、Murakawa Tomokazu、Ito Jumpei、Shah Ajay M.、Conway Simon J.、Ono Masahiro、Otsu Kinya
    • Journal Title

      Science Signaling

      Volume: 14 Issue: 704

    • DOI

      10.1126/scisignal.abe4932

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] 循環器病の克服を目指して2023

    • Author(s)
      大津欣也
    • Organizer
      日本循環器病予防学会
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] 多職種連携により心不全パンデミックに立ち向かう2023

    • Author(s)
      大津欣也
    • Organizer
      第16回日本在宅薬学会学術集会
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] Cardiac inflammation and degradation systems2022

    • Author(s)
      大津 欣也
    • Organizer
      第26回 日本心血管内分泌代謝学会学術総会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] 心臓炎症と細胞内分解システム2022

    • Author(s)
      大津 欣也
    • Organizer
      第27回 日本病態プロテアーゼ学会学術集会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Mitochondrial Degradation and Cardiac Inflammation2022

    • Author(s)
      大津欣也
    • Organizer
      第86回日本循環器学会学術集会
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited

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

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