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Related Experiment Videos

Surface IgE on human basophils during histamine release.

K E Becker, T Ishizaka, H Metzger

    The Journal of Experimental Medicine
    |August 1, 1973
    PubMed
    Summary

    Surface immunoglobulin E (IgE) redistribution on human basophils is dose, time, and temperature dependent. Optimal histamine release and IgE redistribution are not correlated, suggesting specific cross-linking is needed for cell stimulation.

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    Area of Science:

    • Immunology
    • Cell Biology

    Background:

    • Surface immunoglobulin E (IgE) plays a critical role in allergic responses by binding to allergens.
    • Human basophils are key effector cells in allergic reactions, releasing histamine upon activation.
    • Understanding the dynamics of IgE on basophil surfaces is crucial for elucidating allergic mechanisms.

    Purpose of the Study:

    • To investigate the distribution and redistribution patterns of surface IgE on human basophils.
    • To correlate IgE redistribution with histamine release.
    • To determine the specific conditions required for basophil activation.

    Main Methods:

    • Fluorescence microscopy
    • Immunoferritin electron microscopy
    • In vitro histamine release assays

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    Main Results:

    • IgE redistribution is dependent on dose, time, and temperature, requiring divalent anti-IgE.
    • IgE redistribution is independent of calcium ions (Ca++).
    • Histamine release and IgE redistribution are not consistently correlated; optimal histamine release can occur without redistribution, and redistribution can occur without histamine release.

    Conclusions:

    • The findings suggest that only specific types of IgE cross-linking effectively stimulate basophils for histamine release.
    • Basophils capable of histamine release are indistinguishable from non-releasing cells based on IgE redistribution patterns.
    • Antigen-induced histamine release is not necessarily accompanied by gross IgE redistribution, highlighting the complexity of basophil activation pathways.