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Apoptosis as a mechanism for the elimination of cardiomyocytes after acute myocardial infarction

Marek Prech1, Andrzej Marszałek, Josef Schröder

  • 1First Department of Cardiology, Poznan University of Medical Sciences, Poznan, Poland. mmprech@wp.pl

The American Journal of Cardiology
|April 21, 2010
PubMed

Insights

Apoptosis, or programmed cell death, is confirmed as a key pathway for cardiomyocyte death following acute myocardial infarction (AMI). This study identifies apoptotic features in surviving heart muscle cells, indicating ongoing cell loss even after the initial injury.

Area of Science:

  • Cardiovascular Biology
  • Cellular Pathology
  • Myocardial Infarction Research

Background:

  • Apoptosis is a known mechanism of cell loss during acute myocardial infarction (AMI).
  • The role of apoptosis in late-stage myocyte elimination post-AMI remains unclear.
  • This study investigates apoptosis in myocytes that survive AMI.

Purpose of the Study:

  • To identify and characterize features of apoptosis in cardiomyocytes that have survived acute myocardial infarction.
  • To confirm if apoptosis contributes to myocyte loss in the chronic phase after AMI.

Main Methods:

  • Analysis of human heart samples from control subjects and patients with left ventricular aneurysm post-AMI.
  • Morphometric evaluation of myocyte hypertrophy, capillary density, and myocytolysis.
  • Immunohistochemistry for caspase-3 and Bcl-2, followed by transmission electron microscopy.
  • CD-34 immunohistochemistry to quantify capillary density.

Main Results:

  • Significantly reduced capillary density in post-AMI hearts compared to controls (p <0.001).
  • Hypertrophied myocytes with moderate to severe myocytolysis were observed in surviving cells.
  • Caspase-3 expression and presence of apoptotic bodies confirmed apoptosis in post-AMI samples.

Conclusions:

  • Apoptosis is a common pathway for cardiomyocyte death in the context of reduced blood supply after AMI.
  • The findings confirm the role of programmed cell death in the pathophysiology of hearts affected by AMI.

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