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Eosinophil polymorphonuclear leukocyte function in immediate hypersensitivity.

E J Goetzl, S I Wasserman, F Austen

    Archives of Pathology
    |January 1, 1975
    PubMed
    Summary
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    Eosinophil chemotactic factor of anaphylaxis (ECF-A) attracts eosinophils to sites of hypersensitivity. Released eosinophils can regulate inflammation by releasing enzymes that inactivate mediators like SRS-A.

    Area of Science:

    • Immunology
    • Cell Biology
    • Allergy Research

    Background:

    • Immediate hypersensitivity reactions involve mast cell degranulation and mediator release.
    • Eosinophils are key cells in allergic responses, but their precise regulatory roles are under investigation.

    Purpose of the Study:

    • To elucidate the role of eosinophils in hypersensitivity reactions.
    • To identify the mechanisms by which eosinophils modulate inflammatory responses.

    Main Methods:

    • Investigated the release of eosinophil chemotactic factor of anaphylaxis (ECF-A) from mast cells.
    • Assessed the effects of ascorbate and neutrophil immobilizing factor (NIF) on eosinophil influx.
    • Examined the enzymatic activities and mediator-releasing capabilities of eosinophils.

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    Main Results:

    • ECF-A selectively attracts eosinophils to inflammatory sites.
    • Ascorbate enhances and NIF inhibits eosinophil tissue infiltration.
    • Eosinophils release arylsulfatase, inactivating slow-reacting substance of anaphylaxis (SRS-A).
    • Eosinophils contain factors that inhibit histamine release and possess plasminogen and phospholipase B.

    Conclusions:

    • Eosinophils play a significant regulatory role in immediate and subacute hypersensitivity.
    • Unique enzymes and factors released by eosinophils contribute to their function in allergic inflammation.