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Enzymic pathways involved in cell response to H2O2.

E M Link1

  • 1Department of Chemical Pathology, University College and Middlesex School of Medicine, London, UK.

Free Radical Research Communications
|January 1, 1990
PubMed
Summary

This study reveals how glutathione peroxidase and cyclooxygenase enzymes interact to affect epithelial cell survival when exposed to hydrogen peroxide (H2O2). Their combined action influences cell response differently than individual enzyme inhibition.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Oxidative Stress Research

Background:

  • Cellular response to oxidative stress involves complex enzymatic pathways.
  • Glutathione peroxidase (GPx) and cyclooxygenase (COX) are key enzymes in cellular metabolism and stress response.
  • Understanding the interplay between GPx and COX is crucial for predicting cell survival under oxidative conditions.

Purpose of the Study:

  • To investigate the interaction between glutathione peroxidase and cyclooxygenase.
  • To determine the effect of this interaction on the clonogenic survival of epithelial cells exposed to hydrogen peroxide (H2O2).
  • To elucidate how modulating GPx activity influences the effects of COX inhibition on cell survival.

Main Methods:

  • Epithelial cells were exposed in vitro to varying concentrations of hydrogen peroxide (H2O2).
  • Cyclooxygenase activity was inhibited using indomethacin.
  • Glutathione peroxidase activity was modulated by adjusting pH (6.5 or 7.5) and glucose supply.

Main Results:

  • Indomethacin exhibited a biphasic effect on H2O2-induced cell death, increasing it at low H2O2 concentrations and decreasing it at high concentrations.
  • The concentration of H2O2 at which indomethacin's effect shifted was influenced by glutathione peroxidase activity.
  • Increased glutathione peroxidase activity led to enhanced decomposition of H2O2, altering the turning point of indomethacin's effect.

Conclusions:

  • Glutathione peroxidase and cyclooxygenase pathways interact significantly in the presence of H2O2.
  • This interaction modulates epithelial cell survival in response to oxidative stress.
  • The combined effect of these enzymes on cell survival differs from the effect of inhibiting either enzyme alone.

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