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Related Experiment Videos

IgG receptors on the mast cells.

I Moodley, J L Mongar

    Agents and Actions
    |April 1, 1981
    PubMed
    Summary

    Antisera to immunoglobulin G (IgG) subclasses triggered histamine release from rat mast cells, similar to anti-immunoglobulin E (IgE). This indicates IgG subclasses can activate mast cells, contributing to allergic responses.

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    Ionic exchange and fibre contraction.

    Nature·2010

    Area of Science:

    • Immunology
    • Allergy Research
    • Cellular Signaling

    Background:

    • Mast cells are key players in allergic reactions, primarily activated by immunoglobulin E (IgE).
    • The role of immunoglobulin G (IgG) subclasses in mast cell activation is less understood.
    • Investigating IgG subclass involvement can reveal new mechanisms in allergic and immune responses.

    Purpose of the Study:

    • To determine if antisera to rat IgG subclasses can induce histamine release from mast cells.
    • To compare the histamine-releasing capacity of IgG subclass-specific antibodies with IgE.
    • To elucidate the role of IgE in modulating IgG-induced mast cell activation.

    Main Methods:

    • Peritoneal mast cells were isolated from Lister hooded and Wistar rats.
    • Cells were challenged with antisera specific to rat IgG subclasses (IgG1, IgG2a, IgG2b, IgG2c) and IgE.
    • Histamine release was measured to quantify mast cell degranulation.
    • Passive and active sensitization protocols were employed.
    • Inhibition assays using IgE myeloma serum and purified IgE were performed.

    Main Results:

    • Antisera to IgG1 and IgG2a induced significant histamine release from Lister hooded rat mast cells, comparable to anti-IgE.
    • Wistar rats, typically unresponsive, showed a small but significant histamine release upon active sensitization with IgG subclass-specific antisera.
    • IgE myeloma serum and purified IgE inhibited histamine release induced by anti-IgE and, to varying degrees, by anti-IgG subclass antisera.
    • Heating IgE abolished its inhibitory effect, suggesting IgE's role in IgG-mediated histamine release.

    Conclusions:

    • Rat IgG subclasses, particularly IgG1 and IgG2a, can directly activate mast cells to release histamine.
    • IgE plays a complex role in modulating mast cell responses to IgG subclasses.
    • These findings suggest potential alternative pathways for mast cell activation in allergic conditions beyond IgE.

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