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Alpha-adrenoceptor stimulation and calcium movements.

P A van Zwieten, P B Timmermans

    Blood Vessels
    |January 1, 1987
    PubMed
    Summary

    Alpha-adrenoceptor agonists cause vasoconstriction. Extracellular calcium influx is crucial for alpha-2-triggered contractions, while alpha-1 contractions involve both intracellular release and extracellular influx of calcium ions.

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    Area of Science:

    • Pharmacology
    • Cardiovascular Physiology
    • Cellular Physiology

    Background:

    • Vasoconstriction is regulated by alpha-adrenoceptors.
    • Calcium ions play a critical role in vascular smooth muscle contraction.
    • Understanding the source of calcium is key to modulating blood pressure.

    Purpose of the Study:

    • To investigate the role of extracellular calcium influx in alpha-adrenoceptor-mediated vasoconstriction.
    • To differentiate the calcium sources involved in alpha-1 and alpha-2 adrenoceptor activation.
    • To assess the impact of calcium entry blockers and promoters on these processes.

    Main Methods:

    • In vivo and in vitro studies of vasoconstriction.
    • Administration of alpha-2 and alpha-1 adrenoceptor agonists.
    • Application of calcium entry blockers (CEB) and a calcium entry promoter (Bay K 8644).

    Main Results:

    • Alpha-2 adrenoceptor-triggered vasoconstriction consistently involves extracellular calcium influx, essential for smooth muscle contraction.
    • This phenomenon is general across various agonists, CEB, experimental settings, and species.
    • Alpha-1 adrenoceptor-induced vasoconstriction results from both intracellular calcium release and transmembrane calcium influx, with varying ratios depending on the agonist and preparation.

    Conclusions:

    • Extracellular calcium influx is a fundamental mechanism in alpha-2 adrenoceptor-mediated vasoconstriction.
    • Alpha-1 adrenoceptor activation involves a mixed mechanism of calcium mobilization.
    • The balance between intracellular and extracellular calcium sources in alpha-1 responses may be modulated.

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