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Related Experiment Videos

Selenium and lead: mutual detoxifying effects

S C Rastogi, J Clausen, K C Srivastava

    Toxicology
    |November 1, 1976
    PubMed
    Summary

    Selenium supplementation counteracted lead toxicity in rats, restoring normal growth and food intake. Co-administration normalized key enzyme activities, suggesting a protective role for selenium against heavy metal poisoning.

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    Area of Science:

    • Toxicology
    • Environmental Health
    • Nutritional Biochemistry

    Background:

    • Heavy metal toxicity, particularly from lead, poses significant health risks.
    • Selenium is an essential trace element with known antioxidant and protective properties.
    • Understanding the antagonistic or synergistic effects of co-exposed elements is crucial for risk assessment.

    Purpose of the Study:

    • To investigate the antagonistic toxic effects of selenium and lead in growing rats.
    • To determine if selenium can mitigate lead-induced toxicity.
    • To evaluate the impact of combined selenium and lead exposure on growth, food consumption, and specific enzyme activities.

    Main Methods:

    • Chronic lead intoxication induced via cutaneous lead naphthenate application.
    • Chronic selenium intoxication administered through drinking water at varying concentrations (5, 10, 15 ppm).
    • Assessment of growth rate, food consumption, delta-aminolevulinic acid dehydrase (ALA-D) activity, and liver P-450 enzyme activity.
    • Quantification of lead and selenium levels in liver, brain, kidney, and blood.

    Main Results:

    • Rats receiving both selenium and lead exhibited growth rates and food consumption approaching normal levels, unlike those exposed to only one metal.
    • Enzymatic activities (ALA-D and liver P-450) were normal in rats exposed to both metals but depressed in those exposed to lead or selenium alone.
    • Higher concentrations of both lead and selenium were found in organs of rats exposed to both metals compared to single-metal exposure.

    Conclusions:

    • Selenium demonstrates a protective effect against lead toxicity in rats, similar to its role against methylmercury.
    • Co-administration of selenium with lead mitigates the adverse effects on growth, food intake, and key enzymatic functions.
    • These findings highlight the potential of selenium in ameliorating heavy metal poisoning.

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