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Related Experiment Videos

Microsomal epoxide hydrolase in different rat strains.

F Oesch, A Zimmer, H R Glatt

    Biochemical Pharmacology
    |June 1, 1983
    PubMed
    Summary

    Genetic variations in rat epoxide hydrolase activity were identified across 22 strains. These differences were quantitative, autosomal, and codominant, impacting drug metabolism and toxicokinetics.

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    Area of Science:

    • Pharmacology
    • Biochemistry
    • Genetics

    Background:

    • Epoxide hydrolase (EH) is crucial for metabolizing epoxides, reactive intermediates in xenobiotic metabolism.
    • Understanding genetic variations in EH activity is vital for assessing individual susceptibility to toxic compounds.
    • Rat models are frequently used to study xenobiotic metabolism due to conserved pathways.

    Purpose of the Study:

    • To investigate strain-specific differences in hepatic epoxide hydrolase activity in rats.
    • To determine the genetic basis and inheritance pattern of these activity variations.
    • To explore the influence of sex and enzyme induction on EH activity.

    Main Methods:

    • Assessed epoxide hydrolase activity in hepatic microsomes from 22 rat strains.
    • Performed detailed enzymatic characterization (substrate specificity, pH dependence) on selected strains.
    • Utilized immunoprecipitation to quantify enzyme protein levels.
    • Studied inheritance patterns and effects of sex and trans-stilbene oxide induction.

    Main Results:

    • Significant variations in specific hepatic epoxide hydrolase activity (4.3-12.7 nmole/mg/min) were observed across rat strains.
    • Differences were quantitative, not qualitative, with enzyme protein levels correlating to activity.
    • Activity was inherited in an autosomal, codominant manner.
    • Hepatic activity in females and induced activity showed similar genetic control as basal male activity.
    • Extrahepatic tissue activities showed different strain patterns compared to liver.

    Conclusions:

    • Rat strain differences in hepatic epoxide hydrolase activity are primarily quantitative and genetically controlled.
    • Autosomal codominant inheritance suggests a simple genetic mechanism for EH activity variation.
    • Extrapolation of EH activity between different tissues should be done cautiously due to tissue-specific variations.
    • Combined genetic, sex, and induction factors contribute to a wide range of hepatic EH activity in rats.

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