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Subcellular ascorbic acid in scorbutic guinea pig brain.

C H Kuo, N Yonehara, H Yoshida

    Journal of Nutritional Science and Vitaminology
    |January 1, 1979
    PubMed
    Summary

    Ascorbic acid deficiency significantly depletes vitamin C in guinea pig liver and plasma, with brain levels also reduced. Acetylcholine content in the brain remained unchanged despite prolonged vitamin C deficiency.

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    Area of Science:

    • Biochemistry
    • Neuroscience
    • Nutritional Science

    Background:

    • Ascorbic acid (vitamin C) is a crucial antioxidant and cofactor in various biological processes.
    • Its role in brain function and potential depletion during deficiency states requires further investigation.

    Purpose of the Study:

    • To investigate the impact of ascorbic acid deficiency on vitamin C distribution within guinea pig tissues, particularly the brain.
    • To examine the effect of ascorbic acid deficiency on brain acetylcholine levels.

    Main Methods:

    • Induction of ascorbic acid deficiency in guinea pigs using a vitamin C-deficient diet for 18 days.
    • Quantification of ascorbic acid levels in liver, plasma, and brain homogenates.
    • Subcellular fractionation to determine ascorbic acid concentration in different cellular compartments (S3, P2p, microsomes).
    • Measurement of brain acetylcholine content.

    Main Results:

    • Scorbutic guinea pigs showed drastically reduced ascorbic acid levels (<4%) in liver and plasma compared to controls.
    • Brain ascorbic acid content decreased to approximately one-third of control levels.
    • Within normal brain tissue, ascorbic acid concentration was highest in the S3 fraction and P2p fraction (nerve terminal cytoplasm).
    • During deficiency, ascorbic acid levels in P2p and microsome fractions decreased more rapidly than in other fractions.
    • Brain acetylcholine content showed no significant change after 18 days of deficiency.

    Conclusions:

    • Prolonged ascorbic acid deficiency severely impacts vitamin C levels in peripheral tissues and the brain.
    • Specific subcellular fractions in the brain, including nerve terminal cytoplasm, are significantly affected by vitamin C depletion.
    • Despite significant changes in brain ascorbic acid, acetylcholine levels remain stable, suggesting a dissociation between vitamin C status and cholinergic neurotransmission in the short term.

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