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Nitric oxide: a trigger for classic preconditioning?

A Lochner1, E Marais, S Genade

  • 1Medical Physiology and Biochemistry, Faculty of Medicine, University of Stellenbosch, Tygerberg 7505, Republic of South Africa. alo@gerga.sun.ac.za

American Journal of Physiology. Heart and Circulatory Physiology
|November 22, 2000
PubMed
Summary
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Nitric oxide (NO) acts as a trigger in classic preconditioning, enhancing functional recovery in ischemic rat hearts. NO elevation improved reperfusion, suggesting its role in triggering protective mechanisms.

Area of Science:

  • Cardiovascular Physiology
  • Biochemistry

Background:

  • Classic preconditioning (PC) protects the heart against ischemia-reperfusion injury.
  • The role of nitric oxide (NO) and its signaling pathway in PC remains incompletely understood.

Purpose of the Study:

  • To investigate the involvement of the L-arginine-NO-cGMP pathway in the protective effects of classic preconditioning.
  • To determine if NO acts as a trigger or mediator in cardiac preconditioning.

Main Methods:

  • Evaluation of functional recovery in ischemic rat hearts subjected to NO donors or pathway inhibitors.
  • Measurement of cyclic nucleotides (cGMP and cAMP) levels during PC and ischemia.
  • Pharmacological manipulation using NO donors (SNAP, SNP, L-arginine) and inhibitors of nitric oxide synthase and guanylyl cyclase.

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Main Results:

  • NO donors (SNAP, SNP) administered before ischemia improved functional recovery, mimicking PC effects.
  • Inhibitors of the NO pathway partially blocked PC-induced functional recovery when given during PC.
  • Inhibitors did not affect recovery when administered after PC, suggesting NO acts as a trigger.
  • PC, SNAP, and SNP increased cGMP and decreased cAMP levels during ischemia, potentially contributing to cardioprotection.

Conclusions:

  • Nitric oxide (NO) plays a significant role as a trigger in classic preconditioning.
  • The NO-cGMP pathway is involved in mediating the protective effects of cardiac preconditioning.
  • Elevated cGMP and reduced cAMP levels during ischemia may underlie the cardioprotective benefits of NO in PC.