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Age-associated decrease of adenylate cyclase activity in rat myocardium.

S W O'Connor, P J Scarpace, I B Abrass

    Mechanisms of Ageing and Development
    |May 1, 1981
    PubMed
    Summary
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    Aging diminishes heart responses to beta-adrenergic agonists. This study found age-related defects in the heart's adenylate cyclase system, not receptors, contributing to reduced responsiveness.

    Area of Science:

    • Cardiovascular Physiology
    • Aging Research
    • Molecular Biology

    Background:

    • Aging is associated with diminished myocardial responses to beta-adrenergic agonists.
    • Myocardial beta-adrenergic receptors remain unaltered with age, suggesting a post-receptor defect.

    Purpose of the Study:

    • To test the hypothesis that decreased responsiveness to beta-adrenergic agonists in aging hearts is linked to adenylate cyclase system defects.
    • To investigate age-related changes in myocardial adenylate cyclase activity.

    Main Methods:

    • Assessed isoproterenol-stimulated adenylate cyclase activity in myocardial membranes from Fischer 344 rats at 3, 12, and 24 months of age.
    • Measured basal, fluoride-, GTP-, and hormone-stimulated adenylate cyclase activity.
    • Determined the enzyme's Michaelis-Menten constant (Km) for ATP across age groups.

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    Main Results:

    • Basal, fluoride-, GTP-, and hormone-stimulated adenylate cyclase activity decreased by 20-30% with age.
    • The Km for ATP remained statistically unchanged across all age groups studied.
    • These findings indicate an age-related impairment in adenylate cyclase function.

    Conclusions:

    • The diminished responsiveness of the aging heart to beta-adrenergic agonists is likely due to alterations in the adenylate cyclase complex.
    • Potential defects lie within the catalytic subunit or the stimulatory G-protein (Ns) of the adenylate cyclase system.
    • This research highlights a molecular mechanism underlying age-related cardiovascular dysfunction.