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Mechanism of preconditioning. Ionic alterations

C Steenbergen1, M E Perlman, R E London

  • 1Department of Pathology, Duke University Medical Center, Durham, NC 27710.

Circulation Research
|January 1, 1993
PubMed
Summary
This summary is machine-generated.

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Preconditioning protects rat hearts from ischemia by reducing intracellular increases in sodium, calcium, and hydrogen ions. This mechanism enhances functional recovery and reduces enzyme release after reperfusion.

Area of Science:

  • Cardiovascular Physiology
  • Biochemistry
  • Cellular Biology

Background:

  • Preconditioning, involving brief ischemia/reflow periods, improves cardiac function post-ischemia.
  • The underlying mechanism involves modulating ion concentrations and exchange processes.

Purpose of the Study:

  • To investigate how preconditioning affects intracellular ion concentrations ([Na+]i, [Ca2+]i) and pH (pHi) during ischemia.
  • To correlate these changes with functional recovery and enzyme release upon reperfusion.

Main Methods:

  • Perfused rat hearts subjected to preconditioning or no preconditioning.
  • Measurement of pHi, [Na+]i, [Ca2+]i, and high-energy phosphates using 31P and 23Na NMR, and 19F NMR with 5F-BAPTA.
  • Assessment of contractile function and creatine kinase release during reperfusion.

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Main Results:

  • Preconditioned hearts showed attenuated increases in [Na+]i, [Ca2+]i, and [H+]i during ischemia compared to untreated hearts.
  • Preconditioned hearts exhibited significantly better recovery of contractile function and reduced creatine kinase release.
  • Magnesium arrest mimicked preconditioning's protective effects, suggesting a shared pathway involving ion flux inhibition.

Conclusions:

  • Preconditioning likely protects the heart by reducing the stimulation of Na(+)-H+ and Na(+)-Ca2+ exchange, thereby limiting detrimental ion accumulation.
  • The protective benefits of preconditioning are largely achieved when calcium entry is inhibited.