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Related Experiment Videos

Dimeric immunoglobulin E serves as a unit signal for mast cell degranulation

D M Segal, J D Taurog, H Metzger

    Proceedings of the National Academy of Sciences of the United States of America
    |July 1, 1977
    PubMed
    Summary

    Crosslinked immunoglobulin E (IgE) dimers, trimers, and polymers bind mast cells and trigger allergic reactions. Dimers alone are sufficient to initiate IgE-mediated exocytosis, showing their role as a key signaling unit.

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    Area of Science:

    • Immunology
    • Cell Biology
    • Allergy Research

    Background:

    • Immunoglobulin E (IgE) plays a critical role in allergic responses by binding to mast cells.
    • Crosslinking of IgE on mast cell surfaces is a known trigger for degranulation and mediator release.
    • The precise structural requirements of IgE for initiating this signaling cascade are not fully understood.

    Purpose of the Study:

    • To investigate the role of specific IgE polymer sizes in triggering mast cell degranulation.
    • To determine if IgE dimers are sufficient to initiate IgE-mediated exocytosis.
    • To characterize the binding and functional activity of crosslinked IgE fractions.

    Main Methods:

    • Rat IgE was chemically crosslinked using dimethyl suberimidate.
    • Crosslinked IgE was fractionated into monomers, dimers, trimers, and higher polymers via gel filtration.

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  • Fractions were tested for mast cell binding capacity.
  • In vivo passive cutaneous anaphylaxis assays were performed in rats.
  • In vitro histamine and serotonin release assays were conducted using mouse mast cells.

    • Main Results:

    • All fractions (monomers, dimers, trimers, polymers) retained specific binding ability to mast cells.
    • Approximately one-third of cell-bound dimers exhibited bivalent binding.
    • Monomers showed no biological activity in triggering degranulation.
    • Dimers and higher polymers demonstrated potent and comparable activity in both in vivo and in vitro assays.
    • IgE dimers were identified as a minimal functional unit for triggering mast cell responses.

    Conclusions:

    • Crosslinked IgE, specifically dimers, can act as a single signaling unit to initiate IgE-mediated exocytosis.
    • The formation of IgE dimers is sufficient to trigger mast cell degranulation and mediator release.
    • These findings provide critical insights into the structural basis of IgE-mediated allergic signaling.