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Related Experiment Videos

Leukotrienes cause eosinophil emigration into conjunctival tissue.

C S Spada, D F Woodward, S B Hawley

    Prostaglandins
    |April 1, 1986
    PubMed
    Summary

    Leukotrienes (LTs) like LTD4 and LTE4 trigger eosinophil infiltration in the conjunctiva, similar to histamine. This suggests LTs play a direct role in allergic eye conditions.

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    Area of Science:

    • Immunology
    • Ophthalmology
    • Pharmacology

    Background:

    • Leukotrienes (LTs) are inflammatory mediators implicated in allergic diseases.
    • Their specific role in conjunctival inflammation requires further elucidation.

    Purpose of the Study:

    • To investigate the ability of various leukotrienes to induce leukocyte infiltration in the guinea pig conjunctiva.
    • To compare the effects of leukotrienes with histamine and assess the mechanism of LT-induced inflammation.

    Main Methods:

    • Guinea pig conjunctival model.
    • Histological and light microscopy techniques.
    • Administration of LTB4, LTC4, LTD4 stereoisomers, LTE4, and histamine.
    • Use of SRS-A antagonist (FPL 55712) and indomethacin.

    Main Results:

    • LTD4 and LTE4 induced dose-dependent eosinophilic infiltration.
    • LTB4 caused eosinophil and neutrophil infiltration at high doses.
    • The 5R,6S LTD4 stereoisomer was inactive.
    • SRS-A antagonist blocked LT-induced eosinophil emigration, while indomethacin had no effect.
    • Histamine induced comparable eosinophilia.

    Conclusions:

    • Peptidoleukotrienes, particularly LTD4 and LTE4, are potent inducers of eosinophil emigration to the conjunctiva.
    • The response is directly mediated by LTs, not through prostaglandin synthesis.
    • Findings suggest a role for LTs in allergic conjunctivitis and potentially asthma.

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