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2016 Fiscal Year Annual Research Report

Role of mitochondrial permeability transition in necroptosis of the cardiomyocyte

Research Project

Project/Area Number 26461133
Research InstitutionSapporo Medical University

Principal Investigator

三浦 哲嗣  札幌医科大学, 医学部, 教授 (90199951)

Co-Investigator(Kenkyū-buntansha) 三木 隆幸  札幌医科大学, 医学部, 准教授 (00336405)
丹野 雅也  札幌医科大学, 医学部, 講師 (00398322)
Project Period (FY) 2014-04-01 – 2017-03-31
Keywordsnecroptosis / autophagy / cell death
Outline of Annual Research Achievements

TNF-alphaとカスパーゼ阻害薬(z-VAD)を併用することにより誘導した心筋細胞のネクロプトーシスに、RIP1-p62結合によるオートファジーの阻害が関与することを前年度まで明らかにした。その結果を基に、RIP1-p62結合がオートファジーを抑制する機序について、GFP-RFP-LC3 tandem constructのトランスフェクションによるautophagosome, autolysosomeの定量によって解析した。その結果、RIP1-p62結合の亢進は、autophagosome形成を抑制せず、autophagosomeとlysosomeの融合によるautolysosome形成を阻害することと観察した。この所見と一致して、autophagosome形成を制御するシグナルであるPI3K-Akt-p70s6KシグナルやAMPK-ULK1シグナルには、TNF-alpha+z-VADによる変化は見られなかった。また、lyosome内のpHもTNF-alpha+z-VAD処理による影響を受けなかった。また、Atg5のノックアウトによってもTNF-alpha+z-VADによるネクロプトーシスには変化がみられないことから、腫瘍細胞のネクロプトーシスとは異なり、心筋細胞では初期のautophagosomal membraneがネクロプトーシスシグナルのscaffoldにはなっていないことが示唆された。
Autolysosomeにおけるアダプター蛋白であるp62の減少がautophagosomeとlyosomeとの癒合抑制をもたらす機序について、今後さらに解析する予定である。

  • Research Products

    (7 results)

All 2017 2016

All Journal Article (4 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 4 results,  Acknowledgement Compliant: 2 results,  Open Access: 2 results) Presentation (3 results) (of which Int'l Joint Research: 3 results,  Invited: 2 results)

  • [Journal Article] Insufficient activation of Akt upon reperfusion because of its novel modification by reduced PP2A-B55alpha contributes to enlargement of infarct size by chronic kidney disease.2017

    • Author(s)
      Toshiyuki Tobisawa*, Toshiyuki Yano*, Masaya Tanno, Takayuki Miki, Atsushi Kuno, Yukishige Kimura, Satoko Ishikawa, Hidemichi Kouzu, Keitaro Nishizawa, Hideaki Yoshida, Tetsuji Miura
    • Journal Title

      Basic Research in Cardiology

      Volume: 112 Pages: 31

    • DOI

      DOI 10.1007/s00395-017-0621-6

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Chronic Treatment With an Erythropoietin Receptor Ligand Prevents Chronic Kidney Disease-Induced Enlargement of Myocardial Infarct Size.2016

    • Author(s)
      Nishizawa K, Yano T, Tanno M, Miki T, Kuno A, Tobisawa T, Ogasawara M, Muratsubaki S, Ohno K, Ishikawa S, Miura T.
    • Journal Title

      Hypertension

      Volume: 68 Pages: 697-706

    • DOI

      10.1161/HYPERTENSIONAHA.116.07480

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] From basic mechanisms to clinical applications in heart protection, new players in cardiovascular diseases and cardiac theranostics: meeting report from the third international symposium on "New frontiers in cardiovascular research".2016

    • Author(s)
      Cabrera-Fuentes HA, Aragones J, Bernhagen J, Miura T, et al.
    • Journal Title

      Basic Research in Cardiology

      Volume: 111 Pages: 69

    • DOI

      10.1007/s00395-016-0586-x

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Ischaemic conditioning and targeting reperfusion injury: a 30 year voyage of discovery.2016

    • Author(s)
      Hausenloy DJ, Barrabes JA, Davidson SM, Di Lisa F, Downey J, Miura T, et al.
    • Journal Title

      Basic Research in Cardiology

      Volume: 111 Pages: 70

    • DOI

      10.1007/s00395-016-0588-8

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Sequestration of p62 by RIP1 promotes necroptosis through suppression of autophagic flux in cardiomyocytes; a novel cross-talk between autophagy and necroptosis2016

    • Author(s)
      Yano T, Ogasawara M, Miki T, Tanno M, Kuno A, Ohno K, Nishizawa K, Owada W, Mizuno M, Suwawara H, Tatekoshi Y, Nakata K, Ishikawa S, Miura T
    • Organizer
      European Society of Cardiology Congress 2016
    • Place of Presentation
      Rome, Italy
    • Year and Date
      2016-08-27 – 2016-08-31
    • Int'l Joint Research
  • [Presentation] Diabetes and Cardioprotection.2016

    • Author(s)
      Miura T
    • Organizer
      Ischaemic conditioning and targeting reperfusion injury: a 30 year voyage of discovery,
    • Place of Presentation
      Barcelona, Spain
    • Year and Date
      2016-05-12 – 2016-05-13
    • Int'l Joint Research / Invited
  • [Presentation] Role of mitochondria in cell death. The mPTP and its regulatory kinases in cardioprotection.2016

    • Author(s)
      Miura T
    • Organizer
      2016 XXII ISHR World Congress
    • Place of Presentation
      Buenos Aires, Argentina
    • Year and Date
      2016-04-18 – 2016-04-21
    • Int'l Joint Research / Invited

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Published: 2018-01-16  

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