The histone H3K9 methyltransferase SUV39H links SIRT1 repression to myocardial infarction

Nat Commun. 2017 Mar 31:8:14941. doi: 10.1038/ncomms14941.

Abstract

Myocardial infarction (MI) dampens heart function and poses a great health risk. The class III deacetylase sirtuin 1 (SIRT1) is known to confer cardioprotection. SIRT1 expression is downregulated in the heart by a number of stress stimuli that collectively drive the pathogenesis of MI, although the underlying mechanism remains largely obscure. Here we show that in primary rat neonatal ventricular myocytes (NRVMs), ischaemic or oxidative stress leads to a rapid upregulation of SUV39H, the mammalian histone H3K9 methyltransferase, paralleling SIRT1 downregulation. Compared to wild-type littermates, SUV39H knockout mice are protected from MI. Likewise, suppression of SUV39H activity with chaetocin attenuates cardiac injury following MI. Mechanistically, SUV39H cooperates with heterochromatin protein 1 gamma (HP1γ) to catalyse H3K9 trimethylation on the SIRT1 promoter and represses SIRT1 transcription. SUV39H augments intracellular ROS levels in a SIRT1-dependent manner. Our data identify a previously unrecognized role for SUV39H linking SIRT1 trans-repression to myocardial infarction.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Animals, Newborn
  • Cardiotonic Agents / pharmacology
  • Cardiotonic Agents / therapeutic use
  • Gene Silencing / drug effects
  • Histones / metabolism*
  • Lysine / metabolism*
  • Methyltransferases / antagonists & inhibitors
  • Methyltransferases / deficiency
  • Methyltransferases / metabolism*
  • Mice, Inbred C57BL
  • Mice, Knockout
  • Myocardial Infarction / drug therapy
  • Myocardial Infarction / genetics
  • Myocardial Infarction / metabolism*
  • Myocardial Infarction / pathology*
  • Myocytes, Cardiac / drug effects
  • Myocytes, Cardiac / metabolism
  • Myocytes, Cardiac / pathology
  • Oxidative Stress / drug effects
  • Piperazines / pharmacology
  • Piperazines / therapeutic use
  • Rats, Sprague-Dawley
  • Reactive Oxygen Species / metabolism
  • Repressor Proteins / antagonists & inhibitors
  • Repressor Proteins / deficiency
  • Repressor Proteins / metabolism*
  • Sirtuin 1 / genetics
  • Sirtuin 1 / metabolism*
  • Transcription, Genetic
  • Up-Regulation / drug effects
  • Up-Regulation / genetics

Substances

  • Cardiotonic Agents
  • Histones
  • Piperazines
  • Reactive Oxygen Species
  • Repressor Proteins
  • chaetocin
  • Suv39h1 protein, mouse
  • Suv39h1 protein, rat
  • Methyltransferases
  • Sirtuin 1
  • Lysine