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Related Experiment Videos

Pyruvate increases threshold for preconditioning in globally ischemic rat hearts

C A Sargent1, S Dzwonczyk, P Sleph

  • 1Department of Cardiovascular Pharmacology, Bristol-Myers Squibb Pharmaceutical Research Institute, Princeton, New Jersey 08543-4000.

The American Journal of Physiology
|October 1, 1994
PubMed
Summary

Pyruvate affects ischemic preconditioning in rat hearts. Longer ischemic periods are needed to achieve cardioprotection when pyruvate is present, suggesting energy source influences preconditioning effectiveness.

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Area of Science:

  • Cardiovascular Physiology
  • Metabolic Biochemistry

Background:

  • Ischemic preconditioning protects isolated rat hearts.
  • Pyruvate perfusion has previously shown no protective effect.

Purpose of the Study:

  • Investigate if pyruvate alters the threshold for ischemic preconditioning in rat hearts.
  • Determine if increased ischemia duration can overcome pyruvate's effect.

Main Methods:

  • Used a 4 x 5 min ischemic preconditioning protocol on isolated rat hearts.
  • Compared hearts perfused with and without pyruvate.
  • Adjusted preconditioning duration to 4 x 7 min for pyruvate-perfused hearts.
  • Measured functional recovery and lactate dehydrogenase release post-ischemia.
  • Assessed high-energy phosphate levels (ATP, ADP, AMP, creatine phosphate).

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Main Results:

  • 4 x 5 min preconditioning protected non-pyruvate hearts but not pyruvate hearts.
  • Pyruvate-perfused hearts required ~40% longer ischemia for equivalent damage.
  • 4 x 7 min preconditioning with pyruvate provided significant protection.
  • No correlation found between ATP, ADP, or AMP and cardioprotection.
  • Increased creatine phosphate correlated with protection, but its role is uncertain.

Conclusions:

  • Cardioprotection via ischemic preconditioning is influenced by the heart's energy source (pyruvate).
  • The effect is likely due to altered severity of the ischemic stimulus, not high-energy phosphate levels.
  • Adjusting ischemia duration can restore preconditioning efficacy in pyruvate-perfused hearts.