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Cardiac histamine receptors.

J H McNeill, S C Verma, T E Tenner

    Advances in Myocardiology
    |January 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

    Histamine affects heart rate and contractility via H1 and H2 receptors, differing between guinea pigs and rabbits. H2 receptors, like beta-adrenergic receptors, involve cyclic AMP, while H1 receptors do not.

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    Area of Science:

    • Cardiovascular Pharmacology
    • Histamine Receptor Signaling

    Background:

    • Histamine elicits inotropic and chronotropic effects in cardiac tissue.
    • Differential distribution and function of histamine receptors (H1 and H2) exist in guinea pig and rabbit hearts.

    Purpose of the Study:

    • To elucidate the distinct roles of H1 and H2 histamine receptors in cardiac function.
    • To compare the mechanisms of action of histamine receptors with adrenergic receptors.

    Main Methods:

    • Investigated histamine-induced inotropic and chronotropic responses in guinea pig and rabbit hearts.
    • Examined the involvement of cyclic AMP (cAMP) and phosphorylase a in receptor-mediated effects.
    • Assessed the ability of histamine agonists to restore action potentials in depolarized cardiac muscle.

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    Main Results:

    • In guinea pigs, H2 receptor stimulation is primary, while rabbits show H1 receptor predominance with some H2 involvement in the right atria.
    • H2 receptor activation is consistently linked to increased cAMP, unlike H1 receptor activation.
    • Both H2 and beta-adrenergic agonists enhance contractility, heart rate, cAMP, and restore action potentials in depolarized muscle.
    • H1 and alpha-adrenergic agonists induce inotropic effects independent of cAMP and do not restore action potentials.

    Conclusions:

    • Histamine receptor subtypes (H1 and H2) mediate distinct cardiac effects.
    • H2 and beta-adrenergic pathways share common mechanisms involving cAMP, differing from H1 and alpha-adrenergic pathways.