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Cyclic AMP in hypersensitivity reactions

D Vervloet, F Anfosso, P Vellieux

    Allergy
    |December 1, 1979
    PubMed
    Summary
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    Phytohemagglutinin (PHA) triggers histamine release from human leukocytes. Deuterium oxide (D2O) enhances this release, with dibutyryl cyclic AMP (d-cAMP) showing a dual role in modulating the response.

    Area of Science:

    • Immunology
    • Cell Biology
    • Biochemistry

    Background:

    • Phytohemagglutinin (PHA) is known to stimulate immune cells.
    • Histamine release is a key process in allergic and inflammatory responses.
    • The role of cyclic AMP (cAMP) in cellular signaling is complex and context-dependent.

    Purpose of the Study:

    • To investigate the effect of Phytohemagglutinin (PHA) on histamine release from human leukocytes.
    • To examine the influence of deuterium oxide (D2O) and cyclic AMP (cAMP) modulators on PHA-induced histamine release.
    • To explore the potential dual role of cAMP in regulating histamine release.

    Main Methods:

    • Human leukocytes were isolated and treated with PHA.
    • Histamine release was measured in the presence and absence of D2O.

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  • The effects of dibutyryl cyclic AMP (d-cAMP) and isoproterenol (a beta-agonist) on histamine release were assessed.

    • Main Results:

    • PHA induced non-cytotoxic histamine release from human leukocytes.
    • Deuterium oxide (D2O) significantly enhanced PHA-induced histamine release.
    • Dibutyryl cyclic AMP (d-cAMP) enhanced histamine release in the presence of D2O but inhibited it alone. Isoproterenol inhibited histamine release regardless of D2O presence.

    Conclusions:

    • The findings suggest a complex, potentially dual role for cyclic AMP (cAMP) in regulating histamine release.
    • The results indicate the possible existence of distinct cAMP pools within target cells that mediate different cellular responses.
    • Further research is warranted to elucidate the precise mechanisms underlying cAMP's dual effect on histamine release.