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Alcohol-induced brain changes in dogs.

L A Hansen1, B H Natelson, C Lemere

  • 1Department of Neurosciences, University of California, San Diego, School of Medicine, La Jolla 92093-0624.

Archives of Neurology
|September 1, 1991
PubMed
Summary
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Chronic alcohol ingestion in dogs caused enlarged ventricles and reduced glial cells in specific brain regions. These findings suggest white matter vulnerability and regional differences in alcohol

Area of Science:

  • Neuroscience
  • Toxicology
  • Comparative Pathology

Background:

  • Chronic alcohol abuse is linked to brain damage in humans.
  • Neuropathologic mechanisms underlying alcohol-induced brain changes require further elucidation.
  • Animal models are crucial for investigating the effects of chronic ethyl alcohol exposure.

Purpose of the Study:

  • To investigate the neuropathologic effects of chronic ethyl alcohol ingestion on canine brains.
  • To quantify changes in brain structure, including ventricular size, cortical thickness, and cell populations.
  • To explore regional variations in susceptibility to alcohol-induced brain damage.

Main Methods:

  • Five male mongrel dogs received 36% of daily calories from ethyl alcohol for one year.

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  • Control dogs were similarly handled but without alcohol exposure.
  • Post-mortem brain analysis included morphometric determinations of ventricular size, cortical thickness, and neuron/glial cell counts.

    • Main Results:

    • Alcohol-fed dogs exhibited significant lateral ventricular enlargement compared to controls.
    • Cortical thinning was observed specifically in the temporal lobe of alcoholic dogs.
    • Reduced glial cell populations were found in the temporal and frontal cortices of alcoholic dogs.
    • No significant differences were noted in overall brain weight, frontal/parietal cortical thickness, or neuron populations.

    Conclusions:

    • Chronic alcohol ingestion disproportionately affects white matter, leading to ventricular enlargement.
    • Regional variations exist in neocortical susceptibility to alcohol-induced damage.
    • Findings in dogs are consistent with neuroradiologic observations in human alcoholics.
    • These results highlight specific neuropathologic consequences of chronic alcohol abuse.