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Ischemia-reperfusion and cell membrane dysfunction.

M O Perry1, G Fantini

  • 1Department of Surgery, Vanderbilt University School of Medicine, Nashville, Tennessee.

Microcirculation, Endothelium, and Lymphatics
|June 1, 1989
PubMed
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Skeletal muscle ischemia-reperfusion causes cell membrane depolarization, not pump failure. This damage, mediated by oxygen free radicals from leukocytes, can be prevented by antioxidants or neutrophil depletion.

Area of Science:

  • Physiology
  • Biochemistry
  • Cell Biology

Background:

  • Skeletal muscle ischemia-reperfusion (I/R) injury is a significant clinical concern.
  • The mechanisms underlying I/R-induced cellular damage are not fully understood.
  • Previous studies suggest potential roles for both direct membrane injury and energy depletion.

Purpose of the Study:

  • To investigate the cellular mechanisms of skeletal muscle membrane depolarization during I/R.
  • To determine the role of adenosine triphosphate (ATP) levels in I/R-induced injury.
  • To identify potential mediators and preventative strategies for I/R-induced membrane damage.

Main Methods:

  • Inducing partial skeletal muscle ischemia-reperfusion for 1-3 hours in canine and rat models.
  • Measuring intracellular adenosine triphosphate (ATP) levels.

Related Experiment Videos

  • Assessing cell membrane depolarization.
  • Evaluating the effects of superoxide dismutase (SOD), catalase, and neutrophil depletion on membrane integrity.

    • Main Results:

    • Partial skeletal muscle I/R for 1-3 hours induced significant cell membrane depolarization.
    • Intracellular ATP levels remained normal, indicating direct membrane injury over pump failure.
    • Superoxide dismutase (SOD), catalase, and neutrophil depletion effectively prevented membrane depolarization.
    • These findings suggest that oxygen free radicals, released by leukocytes, are key mediators of I/R-induced membrane damage.

    Conclusions:

    • Skeletal muscle I/R causes direct cell membrane injury, evidenced by depolarization.
    • Oxygen free radicals released by leukocytes play a critical role in mediating this damage.
    • Antioxidant enzymes (SOD, catalase) and neutrophil depletion represent potential therapeutic strategies to mitigate I/R injury.