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[Molecular and cellular aspects of dioxin toxicity]

V S Rumak, N V Umnova, G A Sofronov

    Vestnik Rossiiskoi Akademii Meditsinskikh Nauk
    |October 14, 2014
    PubMed
    Abstract

    Insights

    Dioxin exposure in Vietnam caused health issues, including genetic and cellular changes. Individual sensitivity to dioxins is linked to genetic factors and developmental variations in children.

    Area of Science:

    • Molecular toxicology
    • Environmental health
    • Human genetics

    Background:

    • Investigated dioxin intoxication consequences in a Vietnamese population exposed to contaminated environments.
    • Assessed pathological alterations, biomarkers, and ecogenetic effects of dioxin exposure.
    • Evaluated causes of individual sensitivity variability to dioxin toxicity.

    Purpose of the Study:

    • To analyze the health impacts of chronic dioxin intoxication in a Vietnamese population.
    • To identify specific biomarkers and ecogenetic effects associated with dioxin exposure.
    • To understand the factors contributing to differential individual sensitivity to dioxins.

    Main Methods:

    • Compared biomedical indices between dioxin-exposed (n=8142) and control (n=4421) populations.
    • Measured dioxin concentrations using high-resolution chromato-mass spectrometry (84 samples).
    • Assessed cytochrome P-450 system state (94 persons), cytogenetic parameters (368 persons), genetic polymorphism (CYP1A1, GSTM1, GSTT1; n=195), and congenital morphogenetic variants (n=1734).

    Main Results:

    • Observed dioxin absorption, P-450 system induction, and alterations in nuclear/genetic stability and cellular proliferation rates in exposed individuals.
    • Revealed associations between genetic polymorphisms in xenobiotic metabolism/detoxification and developmental/morphogenetic peculiarities in exposed children.

    Conclusions:

    • Characterized preclinical and clinical manifestations of chronic dioxin intoxication.
    • Identified key pathogenetic elements of dioxin-induced alterations.
    • Highlighted the need for methods to prevent dioxin pathology based on preclinical sign detection.

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