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Related Experiment Videos

Vascular studies with histamine in vitro.

D A Owen, C A Harvey, E H Quinn

    Agents and Actions
    |April 1, 1981
    PubMed
    Summary

    Histamine causes dose-dependent blood vessel dilation in rat hindquarters. Cimetidine, but not mepyramine, antagonized these histamine responses, indicating H2 receptor involvement in vascular pharmacology.

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    Area of Science:

    • Pharmacology
    • Vascular Biology
    • Physiology

    Background:

    • Histamine is a key mediator in physiological responses.
    • Understanding histamine's role in vascular tone is crucial for cardiovascular research.

    Purpose of the Study:

    • To investigate the pharmacological mechanisms of histamine-induced vasodilation in rat hindquarters.
    • To characterize the receptor subtypes involved in histamine's vascular effects.

    Main Methods:

    • In vitro studies using rat hindquarter vasculature.
    • Dose-response analysis of histamine and dimaprit.
    • Receptor antagonism studies using cimetidine and mepyramine.

    Main Results:

    • Histamine induced dose-dependent vasodilation (10^-9 to 10^-6 M).
    • Cimetidine antagonized histamine responses, while mepyramine did not.
    • Dimaprit also caused vasodilation, inhibited by cimetidine.
    • A pA2 value of 6.43 was calculated for cimetidine.

    Conclusions:

    • Histamine-induced vasodilation in rat resistance vessels is primarily mediated via H2 receptors.
    • Cimetidine is an effective antagonist for H2 receptor-mediated vasodilation in this model.
    • Findings contribute to understanding histamine's vascular pharmacology.

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