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Myocardial cell vulnerability to exogenous phospholipase attack.

T K Steigen1, T Myrmel, K Forsdahl

  • 1Department of Medical Physiology, University of Tromsø, Norway.

Molecular and Cellular Biochemistry
|October 21, 1992
PubMed
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Phospholipase C (PC-PLC) damages cardiac cells, even with subtle injury. This study shows increased glycerol output and LDH release in stressed rat myocardial cells, indicating vulnerability to phospholipase attack.

Area of Science:

  • Cardiology
  • Cell Biology
  • Biochemistry

Background:

  • Cardiac myocyte damage can compromise cell integrity.
  • Phospholipase enzymes play a role in cellular membrane degradation.
  • Understanding myocyte vulnerability is crucial for cardiac health research.

Purpose of the Study:

  • To investigate the vulnerability of rat myocardial cells to phospholipase C (PC-PLC) attack.
  • To assess PC-PLC induced damage in different states of myocyte stress: triacylglycerol (TG)-loaded, hypothermic/rewarmed, and energy-depleted.
  • To correlate cellular damage markers with PC-PLC activity.

Main Methods:

  • Utilized three distinct rat myocardial cell preparations: TG-loaded, hypothermic/rewarmed, and energy-depleted.
  • Evaluated PC-PLC attack by measuring PC-PLC induced glycerol output, reflecting phospholipase C and intracellular lipase activity.

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  • Assessed cell morphology, lactate dehydrogenase (LDH) release, and cellular adenosine triphosphate (ATP) levels.

    • Main Results:

    • Significantly higher PC-PLC induced glycerol output was observed in all three stressed myocyte preparations compared to controls (p < 0.05).
    • Energy-depleted myocytes showed significant morphological changes (rounded shape) and pronounced LDH release, unlike TG-loaded or hypothermic/rewarmed myocytes.
    • Cellular ATP levels were maintained in TG-loaded and hypothermic/rewarmed myocytes but reduced to ~25% in energy-depleted myocytes.

    Conclusions:

    • Exogenous phospholipase attack can occur in cardiac myocytes exhibiting subtle or overt damage.
    • Myocardial cells, even under less severe stress, demonstrate vulnerability to phospholipase-mediated injury.
    • These findings highlight the importance of cellular energy status and membrane integrity in protecting against phospholipase damage.