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Ethanol and brain ribosomes.

E P Noble, S Tewari

    Federation Proceedings
    |September 1, 1975
    PubMed
    Summary
    This summary is machine-generated.

    Chronic ethanol consumption significantly inhibits brain polypeptide synthesis in rats and mice. This effect impacts both free and membrane-bound polyribosomes, suggesting widespread disruption of brain protein production.

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    Area of Science:

    • Neuroscience
    • Biochemistry
    • Pharmacology

    Background:

    • Chronic ethanol (alcohol) intake is a widespread issue with significant health consequences.
    • Ethanol's impact on cellular processes, particularly protein synthesis in the brain, is not fully understood.
    • Ribosomes and polyribosomes are crucial for protein synthesis and are potential targets for ethanol toxicity.

    Purpose of the Study:

    • To investigate the effects of chronic ethanol consumption on brain ribosome and polyribosome function in mice and rats.
    • To determine if ethanol affects polypeptide synthesis, RNA incorporation, and the distribution of free versus membrane-bound polyribosomes.
    • To elucidate the mechanisms by which ethanol disrupts brain protein synthesis.

    Main Methods:

    • Administering ethanol solutions to rats and mice for chronic intake.

    Related Experiment Videos

  • Measuring in vitro polypeptide synthesis in free and membrane-bound polyribosomes.
  • Assessing in vivo RNA synthesis using [5-3H]-orotic acid incorporation into ribosomes and polysomes.
  • Analyzing the differential effects on free and bound polysomal populations.

    • Main Results:

    • Chronic ethanol intake significantly inhibited polypeptide synthesis in brain ribosomes of both rats and mice.
    • Protein synthesis was diminished more in free polyribosomes than membrane-bound polyribosomes.
    • Ethanol consumption affected messenger RNA (mRNA) and ribosomal RNA (rRNA) synthesis, indicated by reduced [5-3H]-orotic acid incorporation.
    • A differential effect on free and bound polysomes was observed, with free polysomes showing decreased RNA incorporation and bound polysomes showing an opposite trend.

    Conclusions:

    • Chronic ethanol ingestion disrupts brain protein synthesis by inhibiting polypeptide synthesis and affecting RNA metabolism.
    • Ethanol's impact on polyribosomes is complex, with differential effects on free and membrane-bound fractions.
    • These findings highlight potential molecular mechanisms underlying ethanol's neurotoxic effects and disruptions in brain metabolism.