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Acebutolol-induced decrease of mononuclear leukocyte beta-adrenoceptors in hypertension.

A Basso, L Piantanelli, G Cognini

    Pharmacology
    |January 1, 1985
    PubMed
    Summary
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    Acebutolol, a cardioselective beta-blocker, was studied in hypertensive patients. Treatment significantly decreased beta-adrenoceptor density, indicating an agonist-like regulatory mechanism despite its clinical beta-blocking effects.

    Area of Science:

    • Pharmacology
    • Cardiovascular Medicine
    • Molecular Biology

    Background:

    • Acebutolol is a cardioselective beta-blocker with intrinsic sympathomimetic activity.
    • Its regulatory mechanism on receptors, particularly in hypertension, requires further elucidation.

    Purpose of the Study:

    • To investigate the regulatory action of acebutolol on beta-adrenoceptors.
    • To assess changes in beta-adrenoceptor affinity and density in hypertensive patients treated with acebutolol.

    Main Methods:

    • Assay of beta-adrenoceptor affinity and density in human mononuclear leukocytes.
    • Measurement of blood pressure and heart rate before and after acebutolol treatment.
    • Statistical analysis of pre- and post-treatment values.

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    Main Results:

    • No significant change in beta-adrenoceptor affinity was observed.
    • A statistically significant decrease in beta-adrenoceptor density was found post-treatment.
    • Acebutolol treatment led to reductions in blood pressure and heart rate.

    Conclusions:

    • Acebutolol exhibits an agonist-like regulatory mechanism, despite its clinical beta-blocker action.
    • The decrease in receptor density suggests a downregulatory process characteristic of agonists.
    • Acebutolol effectively lowers blood pressure and heart rate in hypertensive patients.