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Hypermetabolic state and hypoxic liver damage.

Y Israel, H Orrego

    Recent Developments in Alcoholism : an Official Publication of the American Medical Society on Alcoholism, the Research Society on Alcoholism, and the National Council on Alcoholism
    |January 1, 1984
    PubMed
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    Chronic alcohol exposure induces a hypermetabolic state in the liver, increasing oxygen consumption. This metabolic adaptation, influenced by thyroid hormones, can lead to hypoxia and potential liver cell damage.

    Area of Science:

    • Hepatology
    • Metabolic Science
    • Toxicology

    Background:

    • Ethanol metabolism rate is often limited by mitochondrial reoxidation of reducing equivalents and liver oxygen consumption.
    • Alcohol dehydrogenase (ADH) can be a rate-limiting step in ethanol metabolism, particularly with high ADH/QO2 ratios.

    Purpose of the Study:

    • To explore the concept of a hypermetabolic state in explaining metabolic tolerance to ethanol.
    • To investigate the role of thyroid hormones and ATP utilization in ethanol-induced hypermetabolism.
    • To examine the consequences of chronic ethanol exposure on liver oxygen tension and potential hypoxia.

    Main Methods:

    • Analysis of oxygen consumption rates in liver preparations from chronically alcohol-fed animals.
    • Assessment of the influence of thyroid hormones and antithyroid drugs on metabolic tolerance and hypermetabolism.

    Related Experiment Videos

  • Measurement of oxygen tensions in blood leaving the liver in humans and animals chronically exposed to ethanol.

    • Main Results:

    • Liver preparations from chronically alcohol-fed animals exhibit increased oxygen consumption rates.
    • Thyroid hormones play a permissive role, and antithyroid drugs inhibit the hypermetabolic state.
    • Chronic ethanol exposure, upon withdrawal, leads to reduced liver oxygen tensions, potentially causing hypoxia.

    Conclusions:

    • A hypermetabolic state contributes to metabolic tolerance to ethanol, characterized by increased liver oxygen consumption.
    • While ATP utilization is involved, proposed mechanisms do not fully explain the observed oxygen consumption increases.
    • Ethanol-induced hepatic hypoxia is a significant concern, with potential for cell necrosis, and propylthiouracil's efficacy in alcoholic hepatitis warrants further study.