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Related Experiment Videos

Free radicals irreversibly decrease Ca2+ currents in isolated guinea-pig ventricular myocytes

J S Gill1, W J McKenna, A J Camm

  • 1Department of Cardiological Sciences, St George's Hospital Medical School, London, UK.

European Journal of Pharmacology
|March 16, 1995
PubMed
Summary

Free radicals significantly reduce voltage-gated Ca2+ currents (ICa) in heart cells. This finding suggests cellular Ca2+ overload in reperfusion injury does not stem from increased Ca2+ entry via these channels.

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Area of Science:

  • Cardiovascular Physiology
  • Cellular Electrophysiology
  • Oxidative Stress Research

Background:

  • Free radicals are implicated in cardiovascular diseases, including reperfusion injury.
  • Voltage-gated Ca2+ channels play a critical role in cardiac excitation-contraction coupling.
  • Understanding the impact of oxidative stress on ion channels is crucial for therapeutic development.

Purpose of the Study:

  • To investigate the effects of free radicals on voltage-gated Ca2+ currents (ICa) in guinea-pig ventricular myocytes.
  • To determine if increased sarcolemmal Ca2+ entry via voltage-gated Ca2+ channels contributes to cellular Ca2+ overload during free radical-mediated reperfusion injury.

Main Methods:

  • Whole-cell patch clamp technique was used to measure ICa in isolated guinea-pig ventricular myocytes.

Related Experiment Videos

  • Free radicals were applied using cumene hydroperoxide or a purine/xanthine oxidase system.
  • ICa was recorded under baseline conditions and after free radical exposure.

    • Main Results:

    • Application of cumene hydroperoxide significantly decreased ICa in a dose-dependent manner.
    • A free radical generating system (purine/xanthine oxidase) also markedly reduced ICa.
    • The observed decrease in ICa was not reversible upon washout with normal recording solution.

    Conclusions:

    • Voltage-gated Ca2+ currents (ICa) are inhibited by free radicals in guinea-pig ventricular myocytes.
    • The findings suggest that increased Ca2+ influx through voltage-gated Ca2+ channels is unlikely to be the cause of cellular Ca2+ overload during reperfusion injury.
    • This study provides insights into the mechanisms of oxidative stress damage in cardiac cells.