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Absorption of cholesterol by the gallbladder

D H Neiderhiser, C K Harmon, H P Roth

    Journal of Lipid Research
    |March 1, 1976
    PubMed
    Summary
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    The guinea pig gallbladder absorbs significant amounts of cholesterol, not cholesterol ester. Absorbed cholesterol can be converted to cholesterol ester, with implications for human cholesterosis.

    Area of Science:

    • Biochemistry
    • Gastroenterology
    • Cell Biology

    Background:

    • Cholesterol absorption mechanisms in the gallbladder are not fully understood.
    • The gallbladder's role in cholesterol homeostasis requires further investigation.

    Purpose of the Study:

    • To determine if the gallbladder can absorb cholesterol.
    • To investigate the fate and localization of absorbed cholesterol within the gallbladder wall.
    • To explore the relationship between bile composition and cholesterol absorption.

    Main Methods:

    • Instillation of radiolabeled cholesterol ([4-14C]cholesterol) into the in situ guinea pig gallbladder.
    • Analysis of radioactivity in the gallbladder wall and subcellular fractions.
    • Use of bromosulfophthalein as a nonabsorbable marker.

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  • Radioautography and specific activity studies to confirm net absorption.

    • Main Results:

    • Significant absorption of cholesterol by the guinea pig gallbladder was observed.
    • Cholesterol absorption decreased with increased concentrations of bile salts and lecithin.
    • Radioactivity was localized in the gallbladder mucosa, mitochondria, and microsomes.
    • Evidence suggested net absorption of cholesterol, not just exchange.

    Conclusions:

    • The guinea pig gallbladder can absorb significant quantities of cholesterol, but not cholesterol ester.
    • Absorbed cholesterol can be converted into cholesterol ester within the gallbladder.
    • These findings may be relevant to understanding cholesterosis in humans.