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Related Experiment Videos

Histamine modulation of eosinophil migration.

R A Clark, J A Sandler, J I Gallin

    Journal of Immunology (Baltimore, Md. : 1950)
    |January 1, 1977
    PubMed
    Summary
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    Histamine

    Area of Science:

    • Immunology
    • Cell Biology

    Background:

    • Eosinophils play a role in inflammatory responses.
    • Histamine receptors (H1 and H2) are present on eosinophils.

    Purpose of the Study:

    • To investigate the dual role of histamine in modulating eosinophil chemotaxis.
    • To elucidate the receptor pathways involved in histamine's effects on eosinophils.

    Main Methods:

    • Eosinophils were preincubated with varying histamine concentrations.
    • Chemotaxis was assessed using nucleopore filter and Zigmond-Hirsch assays.
    • Receptor antagonists (metiamide for H2, H1 antagonist) were used to block specific receptors.
    • Intracellular cyclic AMP levels were measured.

    Main Results:

    Related Experiment Videos

    • High histamine concentrations (≥10⁻⁵ M) inhibited eosinophil chemotaxis via H2 receptors, increasing cyclic AMP.
    • Low histamine concentrations (10⁻⁶ M) enhanced eosinophil chemotaxis via H1 receptors.
    • Isoproterenol, aminophylline, and dibutryl cyclic AMP inhibited eosinophil migration.
    • Histamine's own chemoattractant activity was unaffected by H1 or H2 antagonists.

    Conclusions:

    • Histamine exhibits a dual effect on eosinophil chemotaxis, mediated by distinct H1 and H2 receptors.
    • Inhibition is linked to H2 receptor activation and increased cyclic AMP, while enhancement is via H1 receptors.
    • Eosinophils may possess a third histamine receptor type, as histamine's chemoattractant activity is independent of H1/H2 blockade.