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Related Experiment Videos

Microsomal ethanol-oxidizing system.

C S Lieber

    Enzyme
    |January 1, 1987
    PubMed
    Summary
    This summary is machine-generated.

    Chronic ethanol consumption alters liver microsomal enzymes, increasing the metabolism of drugs and toxins. This leads to metabolic tolerance, enhanced susceptibility to liver damage, and altered vitamin A and lipid metabolism in alcoholics.

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    Area of Science:

    • Biochemistry
    • Pharmacology
    • Toxicology

    Background:

    • Ethanol consumption significantly impacts liver function and metabolism.
    • Microsomal ethanol-oxidizing system (MEOS) plays a crucial role in ethanol metabolism.
    • Chronic alcohol use leads to adaptive changes in hepatic microsomal enzymes.

    Purpose of the Study:

    • To elucidate the consequences of chronic ethanol consumption on microsomal metabolism.
    • To understand the mechanisms behind alcohol-related complications.
    • To investigate the induction of specific cytochrome P-450 forms by ethanol.

    Main Methods:

    • Studies on alcohol dehydrogenase-negative deer mice to demonstrate in vivo MEOS activity.
    • Reconstituted system analysis to characterize ethanol-inducible cytochrome P-450.

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  • Assessment of drug and toxin metabolism in the presence of chronic ethanol exposure.

    • Main Results:

    • Chronic ethanol intake induces a unique form of cytochrome P-450 with high affinity for ethanol.
    • This induction enhances the metabolism of various drugs, leading to metabolic tolerance.
    • Increased conversion of hepatotoxic agents and carcinogens to toxic metabolites, and accelerated retinol catabolism, contributing to liver damage and vitamin A depletion.

    Conclusions:

    • Ethanol-induced changes in microsomal enzymes contribute to alcohol-related pathologies.
    • Enhanced metabolism of xenobiotics and endogenous compounds underlies increased toxicity and metabolic disturbances.
    • Acute ethanol administration inhibits drug metabolism via competitive inhibition of shared pathways.