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Complement and polymorphonuclear leukocyte activation each play a role in determining myocardial ischemia-reperfusion

T Atsuumi1, H Yaoita, T Shichishima

  • 1First Department of Internal Medicine, Fukushima Medical University, Japan.

Japanese Circulation Journal
|July 12, 2001
PubMed

Insights

Cobra venom factor (CVF) activates immune cells, but its effect on heart injury depends on complement and polymorphonuclear leukocytes (PMNs). Both factors are crucial in determining myocardial infarct size after ischemia.

Area of Science:

  • Cardiovascular Research
  • Immunology
  • Inflammation Biology

Background:

  • Cobra venom factor (CVF) is known to activate complement and polymorphonuclear leukocytes (PMNs).
  • The sequential effects of complement activation/depletion and PMN activation/deactivation by CVF offer a model to study their roles in myocardial injury.
  • Understanding the interplay between complement and PMNs is crucial for mitigating ischemia-reperfusion injury.

Purpose of the Study:

  • To investigate the individual and combined effects of complement and PMNs on myocardial infarct size (IS) using CVF-induced sequential changes.
  • To determine whether complement depletion or PMN modulation influences IS during myocardial ischemia-reperfusion.
  • To assess the role of myeloperoxidase (MPO) activity in the context of complement and PMN status on IS.

Main Methods:

  • Rats were treated with CVF and/or anti-PMN antibodies to modulate complement and PMN levels.
  • Myocardial ischemia was induced by coronary artery occlusion followed by reperfusion.
  • Myocardial infarct size (IS) and myeloperoxidase (MPO) activity in the infarct area were quantified.

Main Results:

  • CVF treatment led to transient PMN activation followed by complement depletion and PMN deactivation.
  • Both CVF and anti-PMNs reduced MPO activity and IS.
  • Complement depletion by CVF, despite PMN activation, failed to reduce IS, indicating a complex role.

Conclusions:

  • Complement and PMN status independently influence myocardial infarct size.
  • Ischemic reperfusion injury can occur even with low myocardial MPO activity, highlighting the importance of PMN and complement dynamics.
  • Targeting both complement and PMNs may be necessary for effective treatment of myocardial ischemia-reperfusion injury.

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