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Human hibernating myocardium is jeopardized by apoptotic and autophagic cell death

Albrecht Elsässer1, Achim M Vogt, Holger Nef

  • 1Department of Cardiology, Kerckhoff Clinic, Bad Nauheim, Germany. a.elsaesser@kerckhoff.mpg.de

Journal of the American College of Cardiology
|June 15, 2004
PubMed

Insights

Human hibernating myocardium (HHM) exhibits myocyte loss through ubiquitin-related autophagic cell death and apoptosis. These mechanisms contribute to tissue damage and limit functional recovery after coronary artery bypass graft surgery.

Area of Science:

  • Cardiovascular Biology
  • Cellular Pathology
  • Molecular Medicine

Background:

  • Human hibernating myocardium (HHM) undergoes structural disintegration due to intracellular degeneration, reduced protein synthesis, and fibrosis.
  • Understanding the mechanisms of myocyte loss is crucial for improving outcomes in HHM.

Purpose of the Study:

  • To investigate and objectify myocyte loss in HHM.
  • To elucidate the specific mechanisms driving myocyte death in HHM.

Main Methods:

  • HHM diagnosis using dobutamine echocardiography, radionuclide ventriculography, and thallium-201 scintigraphy.
  • Analysis of transmural biopsies from HHM regions via electron microscopy, immunohistochemistry, TUNEL, RT-PCR, and Western blotting.
  • Comparison with non-diseased human myocardium controls.

Main Results:

  • Significant functional improvement observed post-coronary artery bypass graft surgery (CABG).
  • Evidence of ubiquitin-related autophagic cell death, including autophagic vacuoles and nuclear disassembly.
  • Reduced proteasome 20S subunit levels and increased caspase-3 activation, indicating apoptosis, were observed in HHM myocytes.

Conclusions:

  • Ubiquitin-related autophagic cell death and apoptosis are key mechanisms of myocyte loss in HHM.
  • Myocyte loss in HHM significantly contributes to progressive tissue damage.
  • These cell death pathways impede the extent of functional recovery in HHM.
Abstract

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