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Related Experiment Videos

Nicorandil decreases postischemic actin oxidation.

H Schwalb1, A Olivson, J Li

  • 1The Joseph Lunenfeld Cardiac Surgery Research Center, Kiryat Hadassah, Jerusalem, Israel.

Free Radical Biology & Medicine
|August 28, 2001
PubMed
Summary

Preconditioning protects rat hearts from oxidative damage after ischemia. Nicorandil and ischemic preconditioning improved recovery and reduced protein oxidation, particularly of actin.

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Area of Science:

  • Cardiology
  • Biochemistry
  • Physiology

Background:

  • Ischemic heart disease can lead to oxidative stress and protein damage.
  • Preconditioning strategies may offer cardioprotection against ischemia-reperfusion injury.

Purpose of the Study:

  • To investigate if preconditioning reduces postischemic oxidative protein damage.
  • To compare the effects of nicorandil and ischemic preconditioning on heart function and protein oxidation.

Main Methods:

  • Isolated rat hearts underwent normothermic global ischemia and reperfusion.
  • Hearts were pretreated with nicorandil or subjected to ischemic preconditioning.
  • High-energy phosphates (ATP, phosphocreatine) were measured using (31)P-NMR spectroscopy.
  • Protein carbonyls, indicative of oxidative damage, were assessed via immunoblotting.

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Main Results:

  • Nicorandil and ischemic preconditioning significantly improved postischemic hemodynamic function and high-energy phosphate levels.
  • Protein carbonyl formation was highest in control hearts and significantly reduced by nicorandil and ischemic preconditioning.
  • Actin isoforms were identified as a key protein affected by oxidative damage.

Conclusions:

  • Nicorandil and ischemic preconditioning enhance postischemic recovery by reducing oxidative protein damage, especially to actin.
  • Improved high-energy phosphate levels contribute to enhanced contractile function post-ischemia.
  • Nicorandil demonstrates significant cardioprotective effects by mitigating oxidative stress.