iScience (Jul 2022)

Protective roles of MITOL against myocardial senescence and ischemic injury partly via Drp1 regulation

  • Takeshi Tokuyama,
  • Hideki Uosaki,
  • Ayumu Sugiura,
  • Gen Nishitai,
  • Keisuke Takeda,
  • Shun Nagashima,
  • Isshin Shiiba,
  • Naoki Ito,
  • Taku Amo,
  • Satoshi Mohri,
  • Akiyuki Nishimura,
  • Motohiro Nishida,
  • Ayumu Konno,
  • Hirokazu Hirai,
  • Satoshi Ishido,
  • Takahiro Yoshizawa,
  • Takayuki Shindo,
  • Shingo Takada,
  • Shintaro Kinugawa,
  • Ryoko Inatome,
  • Shigeru Yanagi

Journal volume & issue
Vol. 25, no. 7
p. 104582

Abstract

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Summary: Abnormal mitochondrial fragmentation by dynamin-related protein1 (Drp1) is associated with the progression of aging-associated heart diseases, including heart failure and myocardial infarction (MI). Here, we report a protective role of outer mitochondrial membrane (OMM)-localized E3 ubiquitin ligase MITOL/MARCH5 against cardiac senescence and MI, partly through Drp1 clearance by OMM-associated degradation (OMMAD). Persistent Drp1 accumulation in cardiomyocyte-specific MITOL conditional-knockout mice induced mitochondrial fragmentation and dysfunction, including reduced ATP production and increased ROS generation, ultimately leading to myocardial senescence and chronic heart failure. Furthermore, ischemic stress-induced acute downregulation of MITOL, which permitted mitochondrial accumulation of Drp1, resulted in mitochondrial fragmentation. Adeno-associated virus-mediated delivery of the MITOL gene to cardiomyocytes ameliorated cardiac dysfunction induced by MI. Our findings suggest that OMMAD activation by MITOL can be a therapeutic target for aging-associated heart diseases, including heart failure and MI.

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