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Related Experiment Videos

Substrate specificity of the mouse skin mixed-function oxidase system.

A E Rettie, F M Williams, M D Rawlins

    Xenobiotica; the Fate of Foreign Compounds in Biological Systems
    |March 1, 1986
    PubMed
    Summary

    Mouse skin contains multiple cytochrome P-450 enzyme forms, similar to liver enzymes. These enzymes metabolize various substrates, with skin showing preferential metabolism for certain compounds compared to the liver.

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    Area of Science:

    • Biochemistry
    • Toxicology
    • Pharmacology

    Background:

    • The mixed-function oxidase system, primarily involving cytochrome P-450 enzymes, plays a crucial role in xenobiotic metabolism.
    • Understanding tissue-specific differences in enzyme activity is vital for assessing toxicological risks and drug efficacy.
    • Cytochrome P-450 enzymes in rodent liver are well-characterized, but their presence and function in skin microsomes are less understood.

    Purpose of the Study:

    • To investigate and compare the metabolic capabilities of the mixed-function oxidase system in mouse skin and liver microsomes.
    • To identify specific substrates preferentially metabolized by skin microsomes compared to liver microsomes.
    • To characterize the kinetic properties and inhibitory profiles of key enzymes involved in skin metabolism.

    Main Methods:

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    • Incubation of nine model substrates with skin and liver microsomes from Balb/C mice.
    • Quantification of metabolic rates per mg of microsomal protein.
    • Differential inhibition studies using metyrapone and alpha-naphthoflavone.
    • Kinetic analysis using Eadie-Hofstee plots to determine enzyme kinetics.

    Main Results:

    • Skin microsomal metabolism rates ranged from 0.5-15% of liver rates, varying by substrate.
    • Mouse skin preferentially metabolized ethoxyresorufin, benzo[alpha]pyrene, and diphenyloxazole over aldrin and coumarin.
    • NADPH-cytochrome P-450-dependent metabolism showed differential inhibition patterns in skin microsomes.
    • Aldrin metabolism exhibited biphasic kinetics in both tissues, while ethoxyresorufin showed linear kinetics.

    Conclusions:

    • Mouse skin possesses multiple forms of cytochrome P-450 enzymes.
    • These skin-based cytochrome P-450 forms are functionally analogous to those induced by polycyclic hydrocarbons in rodent liver.
    • Untreated mouse skin exhibits a distinct metabolic profile, highlighting its role in xenobiotic processing.