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IgA interaction with the asialoglycoprotein receptor.

R J Stockert, M S Kressner, J C Collins

    Proceedings of the National Academy of Sciences of the United States of America
    |October 1, 1982
    PubMed
    Summary
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    Normal human serum Immunoglobulin A (IgA) binds to liver receptors, suggesting a mechanism for IgA uptake. This interaction is reversible and depends on specific sugar residues on the IgA molecule.

    Area of Science:

    • Biochemistry
    • Immunology
    • Hepatology

    Background:

    • Immunoglobulin A (IgA) is a key antibody in mucosal immunity.
    • The liver possesses receptors for asialoglycoproteins, involved in clearance pathways.
    • The interaction between IgA and hepatic receptors is not fully understood.

    Purpose of the Study:

    • To investigate the interaction between human serum IgA and the hepatic asialoglycoprotein receptor.
    • To identify the specific molecular components of IgA involved in this binding.
    • To explore the potential role of this interaction in IgA liver uptake.

    Main Methods:

    • Inhibition of receptor-mediated erythroagglutination assays.
    • Chemical oxidation of galactose and N-acetylgalactosamine residues on IgA using galactose oxidase.

    Related Experiment Videos

  • Analysis of IgA subtypes and glycosylation patterns.

    • Main Results:

    • Human serum IgA demonstrated specific binding to the hepatic asialoglycoprotein receptor.
    • Binding was inhibited by oxidation of galactose or N-acetylgalactosamine residues on IgA.
    • The O-glycosidically linked oligosaccharides on the hinge region of the IgAI subtype were identified as the recognition site.

    Conclusions:

    • A specific in vitro binding of IgA to the hepatic asialoglycoprotein receptor was demonstrated.
    • This interaction is mediated by specific carbohydrate structures on IgA.
    • The findings suggest a potential mechanism for the in vivo uptake of polymeric IgA by the liver.