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Glutathione and hepatic mixed-function oxidase activity.

W G Levine

    Drug Metabolism Reviews
    |January 1, 1983
    PubMed
    Summary

    Hepatic glutathione (GSH) regulates cytochrome P-450 N-demethylation, potentially via lipid peroxidation. This finding impacts understanding of drug metabolism and liver protection mechanisms.

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    Area of Science:

    • Biochemistry
    • Hepatology
    • Pharmacology

    Background:

    • Hepatic glutathione (GSH) plays a role in drug metabolism, acting as a substrate for conjugation.
    • GSH also regulates cytochrome P-450 (CYP450) activity, specifically N-demethylation.
    • The precise mechanisms linking GSH, CYP450 activity, and lipid peroxidation are not fully elucidated.

    Purpose of the Study:

    • To investigate the specific role of hepatic GSH in regulating CYP450 activity, particularly N-demethylation.
    • To explore the potential involvement of lipid peroxidation in the observed effects of GSH depletion on CYP450.
    • To identify CYP450 isozymes affected by GSH depletion and understand the underlying mechanisms.

    Main Methods:

    • Depletion of hepatic GSH and assessment of its impact on specific CYP450-mediated drug metabolism reactions (e.g., N-demethylation of DAB, ring hydroxylation).
    • Investigation of the relationship between GSH levels, lipid peroxidation markers, and CYP450 activity in isolated hepatocytes.
    • Measurement of heme oxygenase activity in response to GSH depletion and other relevant conditions.

    Main Results:

    • Loss of hepatic GSH specifically depresses N-demethylation of DAB, while ring hydroxylation remains unaffected.
    • The inhibitory effect of GSH depletion on N-demethylation appears to be non-specific to a single CYP450 isozyme, suggesting an impact on a common enzymatic activity.
    • Hepatic GSH depletion leads to increased heme oxygenase activity, which may contribute to the observed decrease in CYP450 activity.

    Conclusions:

    • Hepatic GSH is crucial for regulating CYP450-mediated N-demethylation, likely through mechanisms involving lipid peroxidation.
    • The sensitivity of N-demethylation to lipid peroxidation, and GSH's protective role, are key factors in this regulation.
    • Heme oxygenase induction following GSH depletion may further contribute to the reduction in CYP450 activity, impacting drug metabolism.

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