Scientific article

Cardiomyocyte-Specific JunD Overexpression Increases Infarct Size following Ischemia/Reperfusion Cardiac Injury by Downregulating Sirt3

Published inThrombosis and Haemostasis, vol. 120, no. 1, p. 168-180
Publication date2020

Ischemia/reperfusion (I/R) injury in acute myocardial infarction activates several deleterious molecular mechanisms. The transcription factor JunD regulates pathways involved in oxidative stress as well as in cellular proliferation, differentiation, and death. The present study investigated the potential role of JunD as a modulator of myocardial injury pathways in a mouse model of cardiac I/R injury. Infarct size, systemic and local inflammation, and production of reactive oxygen species, as well as cytosolic and mitochondrial apoptotic pathways were investigated in adult males after myocardial I/R. In wild-type (WT) mice, 30 minutes after ischemia and up to 24 hours following reperfusion, cardiac JunD messenger ribonucleic acid expression was reduced while JunB increased. Cardiac-specific JunD overexpressing mice (JunDTg/0 ) displayed larger infarcts compared with WT. However, postischemic inflammatory or oxidative responses did not differ. JunD overexpression reduced Sirt3 transcription by binding to its promoter, thus leading to mitochondrial dysfunction, myocardial cell death, and increased infarct size. On the other hand, JunD silencing reduced, while Sirt3 silencing increased infarct size. In human myocardial autopsy specimens, JunD-positive areas within the infarcted left ventricle staining corresponded to undetectable Sirt3 areas in consecutive sections of the same heart. Cardiac-specific JunD overexpression increases myocardial infarct size following I/R. These effects are mediated via Sirt3 transcriptional repression, mitochondrial swelling, and increased apoptosis, suggesting that JunD is a key regulator of myocardial I/R injury. The present data set the stage for further investigation of the potential role of Sirt3 activation as a novel target for the treatment of acute myocardial infarction.

  • Animals
  • Apoptosis
  • Disease Models, Animal
  • Down-Regulation
  • Humans
  • Mice
  • Mice, Inbred C57BL
  • Mice, Knockout
  • Mitochondria/metabolism
  • Myocardial Infarction/metabolism/pathology
  • Myocardium/metabolism/pathology
  • Myocytes, Cardiac/physiology
  • Organ Specificity
  • Proto-Oncogene Proteins c-jun/genetics/metabolism
  • Reperfusion Injury/metabolism/pathology
  • Sirtuin 3/genetics/metabolism
  • Up-Regulation
  • Swiss National Science Foundation - Grant #310030–135815 to T.F.L.; Grant#310030–118245 to F.M.; Grant #32003B-134963/1 toF.M.; Grant #310030–1659 and #310030–165990 to C.M.M.,and Grant #310030_175546 to G.G.C.
  • Swiss National Science Foundation - 326030–150816
Citation (ISO format)
AKHMEDOV, Alexander et al. Cardiomyocyte-Specific JunD Overexpression Increases Infarct Size following Ischemia/Reperfusion Cardiac Injury by Downregulating Sirt3. In: Thrombosis and Haemostasis, 2020, vol. 120, n° 1, p. 168–180. doi: 10.1055/s-0039-3400299
Main files (1)
Article (Published version)
ISSN of the journal0340-6245

Technical informations

Creation10/28/2020 10:36:00 AM
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