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Related Experiment Videos

Interstitial ascorbate in turtle brain is modulated by release and extracellular volume change.

M E Rice, C Nicholson

    Journal of Neurochemistry
    |October 1, 1987
    PubMed
    Summary

    Ascorbic acid (vitamin C) concentration in the brain

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    Area of Science:

    • Neuroscience
    • Neurochemistry
    • Cellular Physiology

    Background:

    • Ascorbic acid (vitamin C) is a crucial antioxidant in the brain.
    • Its role during neuronal activity, particularly under depolarizing conditions, is not fully understood.
    • The turtle cerebellum serves as a model to investigate these effects.

    Purpose of the Study:

    • To investigate the changes in interstitial ascorbic acid concentration during Leão's spreading depression.
    • To determine the mechanisms behind these changes, differentiating between release and volume effects.

    Main Methods:

    • Voltammetry with graphite fiber microelectrodes was used to monitor interstitial ascorbate.
    • Leão's spreading depression was induced as a depolarizing stimulus.
    • Extracellular volume and potential were simultaneously monitored.

    Main Results:

    • A significant increase in interstitial ascorbate was observed during spreading depression.
    • This increase was primarily attributed to a decrease in extracellular volume.
    • A smaller, sodium-dependent release of ascorbate from intracellular stores was also detected.

    Conclusions:

    • Interstitial ascorbate concentration is dynamically regulated by both extracellular volume changes and release mechanisms.
    • Sodium-dependent uptake may play a role in controlling ascorbate levels during neuronal activity.

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