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Related Experiment Videos

Ruthenium red improves postischemic contractile function in isolated rat hearts.

G J Grover1, S Dzwonczyk, P G Sleph

  • 1Department of Pharmacology, Squibb Institute for Medical Research, Princeton, New Jersey.

Journal of Cardiovascular Pharmacology
|November 1, 1990
PubMed
Summary

Ruthenium red improved heart function after ischemia by enhancing oxygen efficiency, unlike diltiazem. This effect may stem from its ability to block mitochondrial calcium uptake, aiding reperfusion recovery.

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Area of Science:

  • Cardiology
  • Biochemistry
  • Pharmacology

Background:

  • Ischemia-reperfusion injury impairs heart function.
  • Mitochondrial calcium overload contributes to injury.
  • Ruthenium red inhibits mitochondrial calcium entry.

Purpose of the Study:

  • To evaluate ruthenium red's effect on reperfusion contractile function and enzyme release.
  • To compare ruthenium red with diltiazem in isolated perfused rat hearts.

Main Methods:

  • Isolated perfused rat hearts subjected to 25 min ischemia and 30 min reperfusion.
  • Pretreatment with ruthenium red (1-10 microM), diltiazem (1 microM), or vehicle.
  • Assessment of contractile function, lactate dehydrogenase (LDH) release, contracture, and oxygen consumption.

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Main Results:

  • Ruthenium red improved reperfusion contractile function at all concentrations without increasing LDH release or contracture.
  • Diltiazem improved function, reduced LDH release, and contracture.
  • Ruthenium red enhanced oxygen efficiency during reperfusion without increasing oxygen consumption, unlike diltiazem.

Conclusions:

  • Ruthenium red improves reperfusion contractile function and oxygen efficiency, potentially via blocking mitochondrial calcium uptake.
  • Ruthenium red exhibits a direct negative inotropic effect and reduces coronary flow in nonischemic tissue.
  • Ruthenium red offers a novel approach to mitigate ischemia-reperfusion injury.