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Dehydroascorbate reduction

W W Wells1, D P Xu

  • 1Department of Biochemistry, Michigan State University, East Lansing 48824.

Journal of Bioenergetics and Biomembranes
|August 1, 1994
PubMed
Summary
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Dehydroascorbic acid, a form of vitamin C, is regenerated in cells by thioltransferases and protein disulfide isomerase. This pathway is crucial for protecting animals from oxygen stress, especially when glutathione is deficient.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Oxidative Stress

Background:

  • Ascorbic acid (vitamin C) is oxidized to dehydroascorbic acid in biological systems.
  • This oxidation involves a semidehydroascorbate radical intermediate.
  • Cellular dehydroascorbic acid levels are maintained by regeneration pathways.

Purpose of the Study:

  • To elucidate the enzymatic mechanisms for dehydroascorbic acid regeneration in animal cells.
  • To investigate the role of dehydroascorbic acid and its regeneration in cellular protection against oxidative stress.
  • To explore the function of dehydroascorbate in protein folding within the endoplasmic reticulum.

Main Methods:

  • Studied the activity of thioltransferases and protein disulfide isomerase in dehydroascorbate reduction.

Related Experiment Videos

  • Utilized glutathione-deficient rodent models to assess the physiological significance of ascorbic acid regeneration.
  • Observed the effects of ascorbic acid administration on mortality and cell damage in GSH-deficient animals.

    • Main Results:

    • Identified thioltransferases and protein disulfide isomerase as key dehydroascorbate reductases in animal cells.
    • GSH deficiency in newborn animals led to reduced ascorbic acid levels and increased dehydroascorbate/ascorbate ratios.
    • Supplementation with ascorbic acid reduced mortality and cellular damage in GSH-deficient animals under oxygen stress.

    Conclusions:

    • Dehydroascorbate regeneration via glutathione-dependent enzymes is vital for maintaining cellular ascorbic acid levels.
    • This pathway plays a critical role in protecting cells from oxidative damage, particularly in conditions of GSH deficiency.
    • Dehydroascorbate participates in the oxidation of protein dithiols to disulfides in the endoplasmic reticulum.