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Related Experiment Videos

Apoptosis in the heart: when and why?

H J Brömme1, J Holtz

  • 1Institute of Pathophysiology, Martin Luther University Halle-Wittenberg, Germany.

Molecular and Cellular Biochemistry
|October 1, 1996
PubMed
Summary

Mammalian heart cells can undergo programmed cell death (apoptosis) due to ischemia or overload, not just necrosis. This regulated process involves DNA fragmentation and PARP inactivation, potentially preventing arrhythmias.

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Area of Science:

  • Cardiology
  • Molecular Biology
  • Cellular Biology

Background:

  • Mammalian cardiac myocytes traditionally thought to die via necrosis from oxygen deprivation.
  • Recent findings reveal apoptosis activation in adult heart cells under stress.

Purpose of the Study:

  • To investigate the role of apoptosis in terminally differentiated mammalian cardiac myocytes.
  • To understand the molecular mechanisms and implications of apoptosis in cardiac stress conditions.

Main Methods:

  • Analysis of gene-directed cellular suicide (apoptosis) in cardiac myocytes.
  • Identification of key molecular players like poly-(ADP-ribose)-polymerase (PARP) and ICE-related proteases (IRPs).
  • Examination of apoptosis triggers including ischemia, reperfusion, and cardiac overload.

Main Results:

  • Apoptosis, a regulated cell death requiring energy and gene expression, is observed in cardiac myocytes.
  • Key event is PARP inactivation by IRPs, leading to DNA fragmentation.
  • Cardiac overload-induced apoptosis contributes to heart failure, preventable by unloading.
  • Myocardial ischemia can activate apoptosis, possibly as an adaptive mechanism.

Conclusions:

  • Apoptosis is an active, genetically programmed cell death pathway in adult mammalian cardiac myocytes.
  • PARP inactivation by IRPs is crucial for the DNA fragmentation characteristic of apoptosis.
  • Apoptosis in cardiac stress may serve adaptive roles, potentially mitigating arrhythmias compared to necrosis.

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