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Studies on the degranulation test for carcinogens.

T W Poole, D V Parke

    FEBS Letters
    |January 10, 1983
    PubMed
    Summary
    This summary is machine-generated.

    Chemical carcinogens like dibenzanthracenes induce degranulation of the hepatic endoplasmic reticulum. This radiometric assay shows limitations in specificity and sensitivity for studying carcinogen-induced membrane changes.

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    Area of Science:

    • Biochemistry
    • Cell Biology
    • Toxicology

    Background:

    • The endoplasmic reticulum's rough membranes are crucial for protein synthesis.
    • Chemical carcinogens can disrupt cellular structures, including the endoplasmic reticulum.
    • Radiometric assays offer a method to quantify cellular changes induced by xenobiotics.

    Purpose of the Study:

    • To re-examine the radiometric assay for degranulation of hepatic endoplasmic reticulum by chemical carcinogens.
    • To assess the specificity and sensitivity of the assay in detecting carcinogen-induced membrane alterations.

    Main Methods:

    • In vitro radiometric assay using hepatic endoplasmic reticulum fractions.
    • Incubation with various chemical carcinogens, including dibenzanthracenes, acetamidofluorenes, and naphthylamines.

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  • Analysis of rough membrane degranulation and assessment of assay limitations using sucrose gradients.

    • Main Results:

    • 1,2,3,4- and 1,25,6-dibenzanthracenes induced in vitro degranulation of rough endoplasmic reticulum membranes.
    • Carcinogenic acetamidofluorenes and naphthylamines caused greater degranulation compared to their non-carcinogenic analogues.
    • Degranulation by 1,2,3,4-dibenzanthracene was rapid, peaking at 5 minutes.
    • Phenobarbital or methylcholanthrene pretreatment increased rough membrane fractions, but they remained incompletely granulated.

    Conclusions:

    • The radiometric assay can detect degranulation of hepatic endoplasmic reticulum induced by certain chemical carcinogens.
    • Assay limitations include poor separation of rough and smooth membranes and ribosome aggregate contamination, affecting specificity and sensitivity.
    • Further refinement of the assay is needed for accurate assessment of carcinogen-induced endoplasmic reticulum damage.