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Related Experiment Videos

Hepatic effects of phthalate esters.

P K Seth

    Environmental Health Perspectives
    |November 1, 1982
    PubMed
    Summary

    Di(2-ethylhexyl) phthalate (DEHP), a common pollutant, alters liver function and drug metabolism. This plasticizer affects key enzymes, impacting how the body processes foreign substances.

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    Area of Science:

    • Environmental Toxicology
    • Pharmacology
    • Hepatology

    Background:

    • Di(2-ethylhexyl) phthalate (DEHP) is a widespread plasticizer and environmental pollutant.
    • DEHP exposure can lead to hepatic alterations and modify responses to xenobiotics.
    • Interactions with xenobiotics may occur during the pharmacokinetic phase.

    Purpose of the Study:

    • To investigate the effects of DEHP on hepatic function and drug metabolism.
    • To examine DEHP's impact on microsomal drug-metabolizing enzymes and ethanol metabolism.
    • To assess the influence of DEHP and its metabolites on specific enzyme activities.

    Main Methods:

    • Administration of DEHP orally and intraperitoneally to assess time- and route-dependent effects.
    • Measurement of hepatic cytochrome P-450 content and enzyme activities (aminopyrine N-demethylase, aniline hydroxylase, alcohol dehydrogenase, aldehyde dehydrogenases).
    • In vitro studies to evaluate the effects of DEHP, mono(2-ethylhexyl) phthalate (MEHP), 2-ethylhexanol (2-EH), dimethyl phthalate (DMP), and dibutyl phthalate (DBP) on enzyme activity.

    Main Results:

    • DEHP altered hepatic cytochrome P-450 content and the activity of drug-metabolizing and ethanol-metabolizing enzymes.
    • In vitro, MEHP and 2-EH inhibited aminopyrine N-demethylase and aniline hydroxylase activity.
    • DMP and DBP also inhibited these enzyme activities after oral administration.

    Conclusions:

    • DEHP significantly affects hepatic enzyme systems involved in xenobiotic and ethanol metabolism.
    • Metabolites of DEHP and other phthalates can inhibit key drug-metabolizing enzymes.
    • Simultaneous exposure to phthalates and other xenobiotics may have significant implications for human health.

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