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ARC contributes to the inhibitory effect of preconditioning on cardiomyocyte apoptosis

Yu Zhen Li1, Xiu Hua Liu, Xiao Mei Zhu

  • 1Department of Pathophysiology, Institute of Basic Medical Science, PLA General Hospital, 100853 Beijing, China.

Apoptosis : an International Journal on Programmed Cell Death
|June 28, 2007
PubMed
Abstract

Insights

Preconditioning protects the heart by inhibiting cardiomyocyte apoptosis. Apoptosis repressor with caspase recruitment domain (ARC) maintains protective protein levels, preventing cell death during cardiac stress.

Area of Science:

  • Cardiovascular Biology
  • Cellular Mechanisms of Cardioprotection
  • Apoptosis Research

Background:

  • Cardioprotection via preconditioning involves inhibiting cardiomyocyte apoptosis.
  • The precise molecular pathways linking preconditioning to apoptosis inhibition remain unclear.
  • Apoptosis repressor with caspase recruitment domain (ARC) is known to inhibit apoptosis in cardiomyocytes.

Purpose of the Study:

  • To investigate the role of ARC in preconditioning-induced cardioprotection.
  • To determine if ARC contributes to the inhibition of cardiomyocyte apoptosis during preconditioning.

Main Methods:

  • Primary cardiomyocytes from Sprague-Dawley rats were subjected to a preconditioning protocol (hypoxia/reoxygenation).
  • Preconditioned and non-preconditioned cells were then exposed to prolonged hypoxia/reoxygenation to induce cell death.
  • ARC protein levels were assessed, and its expression was inhibited using antisense oligonucleotides to evaluate its functional role.

Main Results:

  • Preconditioning significantly reduced cell death induced by hypoxia/reoxygenation.
  • Hypoxia/reoxygenation decreased endogenous ARC protein levels, while preconditioning maintained these levels.
  • Inhibition of ARC using antisense oligonucleotides abrogated the anti-apoptotic effects of preconditioning, including the suppression of cytochrome c release and caspase-3 activation.

Conclusions:

  • ARC plays a crucial role in mediating preconditioning-induced cardioprotection.
  • ARC functions by inhibiting the mitochondrial release of cytochrome c and subsequent caspase-3 activation.
  • Maintaining ARC protein levels is a key mechanism by which preconditioning protects cardiomyocytes from apoptosis.

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