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Related Experiment Videos

Do nitroxides protect cardiomyocytes from hydrogen peroxide or superoxide?

M Mohsen1, A Pinson, R Zhang

  • 1Department of Molecular Biology, Hebrew University--Hadassah Medical School, Jerusalem, Israel.

Molecular and Cellular Biochemistry
|April 26, 1995
PubMed
Summary

Extracellular superoxide radicals do not damage cardiomyocytes. Hydrogen peroxide (H2O2) is the main toxic agent, but nitroxide mimics and catalase offer protection against oxidative stress.

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Area of Science:

  • Cardiology
  • Cell Biology
  • Biochemistry

Background:

  • Extracellular superoxide radicals (O2-) are implicated in cardiac cell damage.
  • Cell-permeable nitroxide superoxide dismutase (SOD)-mimics may offer protection.

Purpose of the Study:

  • To investigate the role of extracellular O2- radicals in cardiac cell damage.
  • To evaluate the protective effects of nitroxide compounds against oxidative stress in cardiomyocytes.

Main Methods:

  • Primary cardiomyocyte cultures from rat pups were used.
  • Oxidative damage was induced using hypoxanthine/xanthine oxidase or glucose/glucose oxidase.
  • Cell viability was assessed by spontaneous beating, lactate dehydrogenase release, and ATP levels.

Main Results:

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  • Nitroxide stable free radicals provided full protection without toxicity.
  • Exogenous catalase offered significant protection, while SOD did not.
  • The metal-chelator dipyridyl showed protective effects.

Conclusions:

  • Extracellular superoxide radicals do not significantly contribute to cultured cardiomyocyte damage.
  • Hydrogen peroxide (H2O2) is identified as the predominant toxic species.
  • Nitroxide compounds and catalase are potential therapeutic agents for oxidative cardiac damage.