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Related Experiment Videos

Cardiac beta-adrenoceptor modulation by amiodarone.

P Nokin, M Clinet, P Schoenfeld

    Biochemical Pharmacology
    |September 1, 1983
    PubMed
    Summary

    Amiodarone reduces beta-adrenoceptor density in rat hearts, contributing to its anti-adrenergic effects. This decrease in receptor number was observed both in vitro and in vivo, suggesting a novel mechanism of action for amiodarone.

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    Area of Science:

    • Pharmacology
    • Cardiovascular Research
    • Molecular Biology

    Background:

    • Amiodarone exhibits beta-antiadrenergic properties.
    • The precise mechanism of amiodarone's cardiac effects requires further elucidation.

    Purpose of the Study:

    • To investigate the action of amiodarone on rat-heart beta-adrenoceptors.
    • To determine if amiodarone affects beta-adrenoceptor density or affinity.

    Main Methods:

    • Used [125I]Cyanopindolol (CYP) to label beta-adrenoceptors in rat heart microsomes.
    • Conducted competition and saturation binding experiments in vitro.
    • Administered amiodarone orally to rats in vivo for acute and chronic studies.

    Main Results:

    • In vitro, high concentrations of amiodarone decreased beta-adrenoceptor number without affecting affinity.
    • In vivo, a single oral dose of amiodarone significantly reduced beta-adrenoceptor density.
    • Chronic amiodarone treatment also led to decreased beta-adrenoceptor numbers.

    Conclusions:

    • Amiodarone decreases myocardial beta-adrenoceptor density.
    • This reduction in receptor number likely contributes to amiodarone's beta-adrenergic antagonism.
    • 5'-Nucleotidase activity remained unaffected, indicating specificity of amiodarone's action on beta-adrenoceptors.

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