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Paraquat toxicity.

L L Smith

    Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
    |December 17, 1985
    PubMed
    Summary
    This summary is machine-generated.

    Paraquat herbicide causes lung damage by generating toxic radicals that deplete NADPH, essential for cell survival and detoxification. This biochemical disruption leads to cell death and severe anoxia in poisoning cases.

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    Area of Science:

    • Toxicology
    • Biochemistry
    • Environmental Health

    Background:

    • Paraquat (1,1'-dimethyl-4,4'-bipyridylium dichloride) is a widely used contact herbicide.
    • Intentional ingestion of paraquat can lead to severe poisoning, primarily characterized by lung damage and potentially fatal anoxia.

    Purpose of the Study:

    • To elucidate the biochemical mechanisms underlying paraquat-induced lung toxicity.
    • To explain the cellular accumulation and radical formation of paraquat in lung tissues.

    Main Methods:

    • Investigated the accumulation of paraquat in alveolar epithelial cells.
    • Analyzed the NADPH-dependent reduction of paraquat to its free radical.
    • Examined the subsequent generation of superoxide anion and hydrogen peroxide (H2O2).

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  • Assessed biochemical changes, including NADPH oxidation and lipid peroxidation.

    • Main Results:

    • Paraquat accumulates in alveolar type I and II epithelial cells via a process similar to diamine/polyamine transport.
    • Accumulated paraquat undergoes NADPH-dependent reduction, forming radicals that generate superoxide and H2O2.
    • Paraquat causes significant and prolonged oxidation of NADPH in the lung.
    • Compensatory biochemical processes may be overwhelmed, leading to insufficient NADPH for detoxification and cell survival.

    Conclusions:

    • Paraquat's lung toxicity is linked to oxidative stress induced by its radical formation and subsequent depletion of NADPH.
    • The inability to maintain adequate NADPH levels contributes to lipid peroxidation, cell death, and severe anoxia.
    • Understanding these mechanisms is crucial for managing paraquat poisoning.