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ARC is a critical cardiomyocyte survival switch in doxorubicin cardiotoxicity

Junfeng An1, Peifeng Li, Jincheng Li

  • 1Department of Cardiology, Charité Campus Buch, Experimental Clinical Research Center, Humboldt University and HELIOS Clinics GmBH, Max-Delbrück-Center for Molecular Medicine, Berlin, Germany.

Journal of Molecular Medicine (Berlin, Germany)
|January 14, 2009
PubMed

Insights

The apoptosis repressor with caspase recruitment domain (ARC) protects heart cells from doxorubicin (Dox)-induced damage. Upregulating ARC enhances resistance to Dox cardiotoxicity, suggesting it as a therapeutic target.

Area of Science:

  • Cardiology
  • Molecular Biology
  • Biochemistry

Background:

  • Doxorubicin (Dox) is a chemotherapy drug that can cause cardiotoxicity, leading to heart failure.
  • Dox-induced cardiotoxicity involves the loss of cardiac myocytes, a key factor in heart failure development.

Purpose of the Study:

  • To investigate the role of the apoptosis repressor with caspase recruitment domain (ARC) in cardiac myocyte survival during Dox-induced cardiotoxicity.
  • To elucidate the mechanisms by which ARC influences Dox-induced apoptosis in cardiomyocytes.

Main Methods:

  • Neonatal rat ventricular cardiomyocytes were exposed to Dox.
  • ARC mRNA and protein levels were assessed.
  • Proteasomal inhibitors were used to evaluate ARC regulation.
  • Endogenous ARC was knocked down, and ARC was overexpressed using adenoviral gene transfer.
  • Bax translocation, mitochondrial membrane potential, cytochrome c release, and caspase activation were analyzed.

Main Results:

  • Dox treatment downregulated ARC mRNA and protein levels, inducing apoptosis in cardiomyocytes.
  • Proteasomal inhibitors partially restored ARC protein levels and reduced apoptosis.
  • ARC knockdown sensitized cardiomyocytes to Dox-induced apoptosis.
  • Enforced ARC expression significantly increased resistance to Dox-induced cell death.
  • ARC prevented Dox-induced Bax translocation to mitochondria, blocking the apoptotic pathway.

Conclusions:

  • The anti-apoptotic protein ARC plays a protective role against Dox-induced cardiotoxicity.
  • ARC's protective mechanism involves inhibiting Bax translocation and the mitochondrial apoptotic pathway.
  • ARC represents a potential therapeutic target for mitigating Dox-induced heart damage.

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