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Ethanol teratogenicity in mice: an electron microscopic study.

J Bannigan, D Cottell

    Teratology
    |October 1, 1984
    PubMed
    Summary

    Maternal ethanol exposure during early pregnancy causes mitochondrial swelling and cell death in mouse neuroepithelium (NE) cells. While damage is initially severe, neural tube defects are less common, suggesting embryo variability or critical developmental timing.

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    Area of Science:

    • Developmental biology
    • Neuroscience
    • Toxicology

    Background:

    • Ethanol exposure during pregnancy is a known teratogen.
    • The developing neuroepithelium is particularly vulnerable to toxic insults.
    • Understanding the cellular mechanisms of ethanol's teratogenicity is crucial for prevention.

    Purpose of the Study:

    • To investigate the ultrastructural effects of acute ethanol exposure on mouse embryonic neuroepithelium.
    • To determine the temporal dynamics of cellular damage and recovery following ethanol treatment.
    • To correlate early cellular damage with the later occurrence of neural tube defects.

    Main Methods:

    • Mouse embryos at day 9 of gestation received intraperitoneal injections of ethanol.
    • Neuroepithelium cells were examined using electron microscopy at various time points post-injection.
    • Cellular morphology, including mitochondrial status and cell death, was assessed.
    • The incidence of neural tube defects was evaluated at 24 hours post-treatment.

    Main Results:

    • Ethanol caused rapid mitochondrial swelling in neuroepithelium cells within 1 hour.
    • Cellular necrosis and fragmentation were observed approximately 5 hours post-ethanol exposure.
    • Intercellular space expansion and apical pseudopod enlargement occurred, possibly due to impaired fluid homeostasis.
    • Most cellular changes reversed by 15 hours, but 28% of embryos showed incomplete neural tube formation at 24 hours.

    Conclusions:

    • Acute ethanol exposure induces significant, but often reversible, ultrastructural damage to the developing neuroepithelium.
    • The discrepancy between early cellular damage and later neural tube defects suggests embryo-specific responses or a narrow sensitive developmental window.
    • Further research is needed to elucidate the precise mechanisms underlying ethanol's teratogenic effects and variability.

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