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The mode of action of p,p'=DDT on mammalian mitochondria

J Z Byczkowski

    Toxicology
    |November 1, 1976
    PubMed

    Insights

    p,p'-DDT exposure in rats reduced mitochondrial efficiency and respiratory function. These changes, particularly in brain mitochondria, may explain DDT intoxication symptoms in mammals.

    Area of Science:

    • Biochemistry
    • Toxicology
    • Neuroscience

    Background:

    • Mitochondria are crucial for cellular energy production.
    • Organochlorine pesticides like p,p -DDT can disrupt cellular functions.
    • Understanding DDT's impact on mitochondrial function is vital for assessing its toxicity.

    Purpose of the Study:

    • To investigate the effects of p,p -DDT on mitochondrial oxidative phosphorylation, respiratory activity, and ATPase activity in rat liver and brain.
    • To correlate changes in brain mitochondria with DDT distribution.
    • To elucidate the mechanisms underlying DDT-induced toxicity.

    Main Methods:

    • Rats were administered single, sublethal doses of p,p -DDT.
    • Mitochondrial oxidative phosphorylation efficiency, respiratory activity (state 3), and ATPase activity were measured in liver and brain homogenates.
    • DDT levels in brain tissue were analyzed over time.

    Main Results:

    • A time- and dose-dependent decrease in oxidative phosphorylation efficiency was observed.
    • Respiratory activity in state 3 was suppressed over time post-DDT treatment.
    • Mitochondrial ATPase activity was stimulated 24 hours after DDT administration in both liver and brain.
    • Correlation between brain mitochondrial changes and DDT distribution was noted.

    Conclusions:

    • p,p -DDT and its metabolites disrupt mitochondrial function.
    • The uncoupling of oxidative phosphorylation, especially in brain mitochondria, is a likely cause of DDT intoxication symptoms.
    • Mitochondrial dysfunction is a key mechanism in DDT toxicity.

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