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Decay-accelerating factor in the cardiomyocytes of normal individuals and patients with myocardial infarction

A Zimmermann1, H Gerber, V Nussenzweig

  • 1Institute of Pathology, University of Bern, Switzerland.

Virchows Archiv. A, Pathological Anatomy and Histopathology
|January 1, 1990
PubMed

Insights

Myocardial infarction (MI) damages cardiomyocytes, causing a loss of decay-accelerating factor (DAF) on their surface. This DAF deficiency correlates with necrosis extent and time post-MI, suggesting complement system involvement.

Area of Science:

  • Cardiovascular Biology
  • Immunology
  • Cellular Pathology

Background:

  • Decay-accelerating factor (DAF) is present on normal cardiomyocyte surfaces.
  • Myocardial infarction (MI) leads to cardiomyocyte injury.
  • The complement system may contribute to myocyte damage during MI.

Purpose of the Study:

  • To investigate DAF expression on cardiomyocytes in patients with myocardial infarction.
  • To explore the relationship between DAF deficiency and myocardial damage.
  • To assess the potential role of the complement system in MI-induced myocyte injury.

Main Methods:

  • Immunohistochemical analysis of cardiomyocyte DAF expression.
  • Comparison of DAF staining in normal, ischemic, and infarcted myocardial regions.
  • Correlation of DAF-deficient myocytes with necrosis extent and post-MI survival time.

Main Results:

  • Normal cardiomyocytes exhibit consistent DAF surface expression.
  • Within infarcted zones, cardiomyocytes show reduced or absent DAF staining.
  • The number of DAF-deficient myocytes increases with necrosis severity and time since MI onset.

Conclusions:

  • Myocardial ischemia and infarction lead to a loss of DAF from cardiomyocyte surfaces.
  • DAF deficiency in cardiomyocytes may indicate susceptibility to complement-mediated injury.
  • Phospholipase activity is a potential mechanism for DAF removal from damaged cardiomyocytes.

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