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Leukotriene generation by eosinophils.

A Jörg, W R Henderson, R C Murphy

    The Journal of Experimental Medicine
    |February 1, 1982
    PubMed
    Summary
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    Horse eosinophils produce significantly more slow-reacting substance (SRS) than neutrophils. This SRS is identified as specific leukotrienes, indicating a role for eosinophils in arachidonic acid metabolism.

    Area of Science:

    • Immunology
    • Biochemistry
    • Cell Biology

    Background:

    • Eosinophils are immune cells involved in inflammatory responses.
    • Leukotrienes are lipid mediators implicated in allergic and inflammatory diseases.

    Purpose of the Study:

    • To investigate the production and characterization of slow-reacting substance (SRS) by horse eosinophils.
    • To determine if SRS produced by eosinophils is derived from the lipoxygenase pathway.

    Main Methods:

    • Purification of horse eosinophils and neutrophils.
    • Incubation with calcium ionophore A23187 to stimulate SRS production.
    • Inhibition and augmentation studies using specific pathway inhibitors and substrates.
    • Purification and identification of SRS compounds using HPLC, UV spectra, GC-MS, and radiolabeling.

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    Main Results:

    • Purified horse eosinophils produced significantly higher amounts of SRS compared to neutrophils.
    • SRS production was sensitive to inhibitors and substrates of the lipoxygenase pathway.
    • Key leukotrienes, including leukotriene B4, C4, and D4, were identified as the SRS products.

    Conclusions:

    • Horse eosinophils are a major source of SRS, primarily producing leukotrienes.
    • These findings highlight the role of eosinophils in the lipoxygenase metabolism of arachidonic acid.
    • The identified leukotrienes may play a significant role in equine inflammatory conditions.