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Related Experiment Videos

[Amine receptors in brain vessels].

L Edvinsson, Ch Owman

    Fiziologicheskii Zhurnal SSSR Imeni I. M. Sechenova
    |October 1, 1975
    PubMed
    Summary

    This study characterized amine receptors in cat and human cerebral arteries. Key findings include distinct alpha and beta adrenergic receptors, dose-dependent acetylcholine effects, specific histamine H2 receptors, and potent vasoconstriction by 5-hydroxytryptamine.

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    Neuropeptide Y-mediated constriction and dilation in rat middle cerebral arteries.

    Journal of cerebral blood flow and metabolism : official journal of the International Society of Cerebral Blood Flow and Metabolism·2001

    Area of Science:

    • Vascular Pharmacology
    • Neuroscience
    • Biochemistry

    Background:

    • Cerebral arteries possess complex receptor systems influencing blood flow.
    • Understanding these receptors is crucial for managing neurological conditions affecting cerebral circulation.

    Purpose of the Study:

    • To pharmacologically characterize amine receptors in isolated cat middle cerebral arteries and human pial arteries.
    • To determine the function and selectivity of adrenergic, cholinergic, histaminergic, and serotonergic receptors in cerebral vasoconstriction and dilation.

    Main Methods:

    • Utilized an in vitro system for sensitive pharmacological characterization of isolated feline and human cerebral arteries.
    • Employed selective receptor agonists and antagonists to identify and quantify receptor subtypes and their effects.

    Main Results:

    • Identified contractile alpha and dilatory beta adrenergic receptors.
    • Observed dose-dependent effects of acetylcholine (dilation at low doses, constriction at high doses), both inhibited by atropine.
    • Confirmed the presence of specific dilatory histamine H2 receptors, with non-specific constriction at high histamine doses.
    • 5-Hydroxytryptamine demonstrated potent vasoconstriction, effectively blocked by methysergide.

    Conclusions:

    • Cerebral arteries exhibit a diverse array of amine receptors mediating significant vascular responses.
    • Pharmacological profiling reveals distinct roles for alpha/beta-adrenergic, cholinergic, H2-histaminergic, and serotonergic receptors in regulating cerebral blood flow.

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