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Alterations in apoptotic signaling in human idiopathic cardiomyopathic hearts in failure

Charles Steenbergen1, Cynthia A Afshari, John G Petranka

  • 1Department of Pathology, Duke University Medical Center, Durham 27710, USA.

American Journal of Physiology. Heart and Circulatory Physiology
|October 22, 2002
PubMed

Insights

This study investigated gene expression in human hearts with dilated cardiomyopathy and heart failure. Researchers found a shift towards apoptosis, with decreased expression of key anti-apoptotic genes, suggesting new therapeutic targets.

Area of Science:

  • Cardiovascular Biology
  • Molecular Medicine
  • Genomics

Background:

  • Dilated cardiomyopathy (DCM) is a heart failure cause with unknown origins.
  • Altered gene expression is implicated in heart failure progression, but human data is limited.
  • Apoptosis plays a role in heart failure pathogenesis.

Purpose of the Study:

  • To investigate changes in apoptosis-related gene expression in human idiopathic DCM hearts with heart failure.
  • To identify specific molecular pathways altered in human heart failure.
  • To uncover potential therapeutic targets for DCM and heart failure.

Main Methods:

  • DNA microarray profiling of human idiopathic dilated cardiomyopathic hearts.
  • Analysis of gene expression changes related to apoptosis.
  • Investigation of the Tumor Necrosis Factor-alpha (TNF-alpha) signaling pathway.

Main Results:

  • Observed a proapoptotic shift in the TNF-alpha signaling pathway.
  • Found decreased expression of TNF-alpha- and Nuclear Factor-kappaB (NF-kappaB)-induced antiapoptotic genes, including growth arrest and DNA damage-inducible beta (GADD45beta), Flice inhibitory protein (FLIP), and TNF-induced protein 3 (A20).
  • Observed decreased phosphorylation of BAD at Ser-112, consistent with increased apoptosis.

Conclusions:

  • Human heart failure associated with DCM exhibits altered gene expression favoring apoptosis.
  • The TNF-alpha signaling pathway is significantly impacted in failing human hearts.
  • Identified specific genes and pathways as potential therapeutic targets for heart failure treatment.

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