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Related Experiment Videos

Gut-liver interactions in the IgA system.

H J Hodgson

    Scandinavian Journal of Gastroenterology. Supplement
    |January 1, 1985
    PubMed
    Summary
    This summary is machine-generated.

    The liver acts as an IgA-pump in rodents, but this function is limited in humans. High IgA in liver disease stems from increased production and reduced breakdown, not impaired liver transport.

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    Area of Science:

    • Immunology
    • Hepatology
    • Gastroenterology

    Background:

    • Rodent studies show the liver transports polymeric IgA from serum to bile via hepatic parenchymal cells.
    • This IgA transport involves a secretory-component mediated uptake mechanism.

    Purpose of the Study:

    • To investigate the extent of the liver's IgA-pump function in humans.
    • To determine the cause of elevated serum IgA levels in chronic liver disease.

    Main Methods:

    • Survey of existing studies on IgA transport in humans and liver disease.
    • Analysis of IgA synthesis and catabolism in the context of hepatobiliary transport.

    Main Results:

    • The liver's IgA-pump function is significantly less pronounced in humans compared to rodents.

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  • Impaired hepatobiliary IgA transport does not account for high serum IgA in chronic liver disease.

    • Conclusions:

    • Elevated serum IgA in chronic liver disease is primarily due to enhanced IgA synthesis.
    • Diminished catabolism of polymeric IgA, independent of liver transport, also contributes to high IgA levels.