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Ascorbic acid and hepatic drug metabolism

P H Sato, V G Zannoni

    The Journal of Pharmacology and Experimental Therapeutics
    |August 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

    Ascorbic acid deficiency impairs liver drug metabolism by affecting cytochrome P-450 stability. Ascorbic acid (vitamin C) interacts with cytochrome P-450, crucial for drug detoxification.

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    Area of Science:

    • Biochemistry
    • Pharmacology
    • Nutritional Science

    Background:

    • Hepatic microsomal drug metabolism is influenced by ascorbic acid levels in vivo.
    • Ascorbic acid deficiency decreases, while high supplementation augments, drug metabolism in guinea pigs.

    Purpose of the Study:

    • To investigate the mechanism by which ascorbic acid deficiency affects hepatic microsomal drug metabolism.
    • To explore the interaction between ascorbic acid and cytochrome P-450.

    Main Methods:

    • Kinetic studies using O-demethylase and p-nitroanisole.
    • Analysis of lipid peroxidation and phosphatidyl choline in microsomes.
    • Assessing the stability of microsomal cytochrome P-450 under various conditions (sonication, dialysis, metal chelators).
    • Investigating the protective effect of ascorbic acid against iron chelator inhibition.

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    Main Results:

    • Ascorbic acid deficiency reduces cytochrome P-450 stability and O-demethylase activity, which is preventable by adding ascorbic acid.
    • A consistent molar ratio of microsomal ascorbic acid to cytochrome P-450 (2:1) suggests a close association.
    • Ascorbic acid protects cytochrome P-450 and aniline hydroxylase activity from inhibition by iron chelators.

    Conclusions:

    • Ascorbic acid deficiency impacts drug metabolism primarily through decreased cytochrome P-450 stability, not altered kinetics or lipid peroxidation.
    • There is a significant interaction between ascorbic acid and cytochrome P-450, involving the heme iron.