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Related Experiment Videos

Is ascorbic acid an antioxidant for the plasma membrane?

J M May1

  • 1Departments of Medicine and Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-6303, USA. james.may@mcmail.vanderbilt.edu

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
|May 25, 1999
PubMed
Summary

Ascorbic acid (vitamin C) has a trans-plasma membrane oxidoreductase activity, crucial for antioxidant defense and cellular processes. Its precise mechanism and function in protecting lipids and facilitating iron uptake require further investigation.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Antioxidant Research

Background:

  • Ascorbic acid (vitamin C) is a key antioxidant in plasma and cells.
  • It exhibits trans-plasma membrane oxidoreductase activity, donating electrons across the cell membrane.
  • This activity is vital for recycling alpha-tocopherol and protecting membrane lipids from peroxidation.

Purpose of the Study:

  • To investigate the unknown mechanism and function of ascorbate-dependent trans-plasma membrane oxidoreductase activity.
  • To explore the potential physiological roles of this oxidoreductase activity within cellular systems.

Main Methods:

  • Studied ascorbate-dependent oxidoreductase activity using extracellular ferricyanide as an electron acceptor.
  • Compared NADH:ferricyanide reductase activity in open membranes with ascorbate as the preferred intracellular electron donor.

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Main Results:

  • Ascorbate-derived reducing capacity is transmitted into and across the plasma membrane.
  • The oxidoreductase may involve membrane-spanning proteins or a trans-membrane electron transport chain.
  • Ascorbate is the preferred electron donor within cells, unlike NADH in open membranes.

Conclusions:

  • The ascorbate-dependent oxidoreductase activity plays a significant role in cellular redox balance and antioxidant defense.
  • Potential functions include stimulating cell growth, reducing radicals, recycling alpha-tocopherol, and facilitating iron uptake.
  • Further research is essential to fully elucidate the structure, mechanism, and physiological importance of this membrane-bound oxidoreductase.