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The ascorbate-driven reduction of extracellular ascorbate free radical by the erythrocyte is an electrogenic process.

M M VanDuijn1, J Van der Zee, P J Van den Broek

  • 1Department of Molecular Cell Biology, Sylvius Laboratory, Leiden University Medical Center, P.O. Box 9503, 2300 RA, Leiden, The Netherlands

FEBS Letters
|February 28, 2001
PubMed
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Erythrocytes reduce extracellular ascorbate free radicals via a plasma membrane redox system. This process is electrogenic, meaning it involves electron transport and affects cell membrane potential.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Physiology

Background:

  • Erythrocytes possess a plasma membrane redox system.
  • This system utilizes intracellular ascorbate to reduce extracellular ascorbate free radicals.

Purpose of the Study:

  • To investigate the electrogenic properties of the erythrocyte plasma membrane redox system.
  • To determine the effect of ascorbate free radical reduction on erythrocyte membrane potential.

Main Methods:

  • Utilized the fluorescent dye 3,3'-dipropylthiadicarbocyanine iodide to monitor erythrocyte membrane potential.
  • Assessed the rate of ascorbate free radical reduction under varying membrane potential conditions.

Main Results:

  • Ascorbate free radical reduction led to erythrocyte membrane depolarization.

Related Experiment Videos

  • The redox system's activity was sensitive to membrane potential changes.
  • Hyperpolarized erythrocytes exhibited a higher reduction rate compared to depolarized cells.

    • Conclusions:

    • The ascorbate-driven reduction of extracellular ascorbate free radicals is an electrogenic process.
    • Vectorial electron transport is implicated in the reduction of extracellular ascorbate free radicals by erythrocytes.