A comparison of cardiac alpha-adrenoceptor number and affinity between aorta-coarcted hypertensive and normotensive

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Ascending Aortic Constriction in Rats for Creation of Pressure Overload Cardiac Hypertrophy Model

Published on: June 29, 2014

F M Lai, H Herzlinger, P Cervoni

    Research Communications in Chemical Pathology and Pharmacology
    |January 1, 1984
    PubMed

    Insights

    Hypertension induced by aorta coarctation did not alter cardiac alpha-adrenoceptor concentration or affinity in rats. This finding differs from other experimental hypertension models, suggesting unique cardiac adrenoceptor responses.

    Area of Science:

    • Cardiovascular Physiology
    • Pharmacology
    • Hypertension Research

    Background:

    • Elevated blood pressure (BP) can impact cardiac function.
    • Cardiac adrenoceptors play a crucial role in regulating heart activity.
    • Understanding adrenoceptor changes in hypertension is vital for therapeutic development.

    Purpose of the Study:

    • To investigate the effect of aorta-coarctation induced hypertension on cardiac alpha-adrenoceptor concentration and affinity.
    • To compare these adrenoceptor parameters at different stages of hypertension.

    Main Methods:

    • Establishing aorta-coarcted hypertensive rats (AHR) and sham-operated normotensive rats (SNR).
    • Measuring mean arterial blood pressure (MABP) and cardiac hypertrophy index.
    • Analyzing myocardial membranes for alpha-adrenoceptor concentration and radioligand affinity at 2, 6, and 28 days post-surgery.

    Main Results:

    • Aorta coarctation significantly increased MABP and cardiac hypertrophy.
    • No significant differences were observed in cardiac alpha-adrenoceptor concentration between AHR and SNR.
    • Receptor affinity for the radioligand remained similar in both groups across all time points.

    Conclusions:

    • Aorta-coarctation induced hypertension does not alter cardiac alpha-adrenoceptor concentration or affinity.
    • These findings contrast with previous reports in other experimental hypertension models.
    • This suggests a distinct cardiac adrenoceptor response in this specific hypertension model.

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