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Related Experiment Videos

Nuclear activation of polycyclic hydrocarbons.

E Bresnick

    Drug Metabolism Reviews
    |January 1, 1979
    PubMed
    Summary

    This study establishes that cell nuclei possess mixed function oxidase activity, similar to microsomes. Nuclei were found to contain inducible enzymes and catalyze the formation of carcinogenic benzo[a]pyrene diolepoxides.

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    Area of Science:

    • Biochemistry
    • Cell Biology
    • Toxicology

    Background:

    • Mixed function oxidases are crucial for metabolizing xenobiotics.
    • Microsomes are known to possess these enzyme systems.
    • The role of cell nuclei in xenobiotic metabolism is less understood.

    Purpose of the Study:

    • To investigate the presence and localization of mixed function oxidase activity in cell nuclei.
    • To characterize the enzymatic capabilities of nuclear mixed function oxidases.
    • To determine if nuclei can metabolize polycyclic hydrocarbons like benzo[a]pyrene.

    Main Methods:

    • Isolation and characterization of cell nuclei.
    • Enzyme assays for O-deethylase and epoxide hydrase activity.
    • Incubation of nuclei with benzo[a]pyrene and analysis of metabolites.

    Main Results:

    • Nuclear preparations exhibited significant mixed function oxidase activity.
    • The localization of these enzymes within the nucleus was confirmed.
    • Inducible O-deethylase and epoxide hydrase activities were identified in nuclei.
    • Nuclei catalyzed the formation of syn- and anti-benzo[a]pyrene diolepoxides.

    Conclusions:

    • Cell nuclei possess functional mixed function oxidase systems.
    • Nuclear enzymes contribute to the metabolic activation of polycyclic hydrocarbons.
    • This finding has implications for understanding nuclear-mediated toxicity and carcinogenicity.

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