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Related Experiment Videos

Immunoglobulin binding by mouse intestinal epithelial cell receptors

R L Guyer, M E Koshland, P M Knopf

    Journal of Immunology (Baltimore, Md. : 1950)
    |August 1, 1976
    PubMed
    Summary

    Maternal antibodies (IgG) are transported to newborn mice via intestinal receptors that specifically bind to IgG Fc determinants. Receptor affinity for IgG subclasses correlates with milk concentration, uniquely binding non-aggregated IgG.

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    Area of Science:

    • Immunology
    • Molecular Biology
    • Gastroenterology

    Background:

    • Maternal antibodies are crucial for neonatal immunity.
    • The transport mechanism of Immunoglobulin G (IgG) from mother to offspring is vital for early-life protection.
    • Understanding IgG receptor interactions is key to neonatal immunology.

    Purpose of the Study:

    • To investigate the specificity and characteristics of intestinal receptors responsible for IgG transport in neonatal mice.
    • To determine how different IgG subclasses interact with these receptors.
    • To elucidate the structural basis of IgG-receptor binding.

    Main Methods:

    • Utilized internally labeled mouse myeloma proteins and enzymatically generated Fc fragments.
    • Conducted competition experiments to assess binding affinities.

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  • Analyzed the interaction between various IgG subclasses and intestinal receptors.

    • Main Results:

    • Intestinal receptors exhibit single specificity for IgG Fc determinants.
    • IgG subclasses display varying affinities for receptors, indicating similar but not identical Fc recognition sites.
    • Receptor affinity order for IgG subclasses correlates with their concentration in mouse milk.
    • Specific Fc fragment subfractions were found inactive in receptor binding.
    • Unique ability of intestinal receptors to bind non-aggregated IgG was observed.

    Conclusions:

    • Neonatal intestinal receptors possess specific binding sites for IgG Fc regions.
    • The affinity of these receptors for different IgG subclasses is finely tuned and linked to maternal milk composition.
    • These receptors represent a unique class of Fc receptors due to their tight binding of non-aggregated IgG, facilitating efficient maternal antibody transfer.