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Age-related decrease in beta adrenergic receptor-mediated vascular smooth muscle relaxation.

G Tsujimoto, C H Lee, B B Hoffman

    The Journal of Pharmacology and Experimental Therapeutics
    |November 1, 1986
    PubMed
    Summary
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    Aging reduces beta adrenergic receptor-mediated vascular smooth muscle relaxation. This age-related decline in older rats is linked to impaired cyclic AMP (cAMP) signaling, suggesting defects beyond initial receptor activation.

    Area of Science:

    • Cardiovascular Physiology
    • Aging Research
    • Pharmacology

    Background:

    • Beta adrenergic receptor-mediated vasodilation declines with age.
    • Understanding this age-related decline is crucial for cardiovascular health in aging populations.

    Purpose of the Study:

    • To investigate the cellular mechanisms underlying reduced beta adrenergic receptor-mediated vascular smooth muscle relaxation in aged rats.
    • To determine if age-related changes in beta receptor number or cyclic AMP (cAMP) signaling pathways contribute to diminished vasodilation.

    Main Methods:

    • Compared mesenteric artery rings from young and aged rats.
    • Administered beta-adrenergic agonist isoproterenol, acetylcholine, and nitroglycerin to assess relaxation.
    • Measured beta receptor density and cyclic AMP (cAMP) accumulation in response to stimuli.

    Related Experiment Videos

  • Evaluated the effects of forskolin and dibutyryl cAMP on vascular relaxation.

    • Main Results:

    • Aged rats showed significantly reduced relaxation to isoproterenol compared to young rats (27.6% vs. 92.7%).
    • Beta receptor number was similar between age groups.
    • Maximal cAMP accumulation induced by isoproterenol was lower in aged vessels, but forskolin-stimulated cAMP accumulation was equal.
    • Vascular relaxation responses to forskolin and dibutyryl cAMP were diminished in aged rats.

    Conclusions:

    • The age-related decrease in beta adrenergic vasodilation is not due to reduced beta receptor number.
    • Impaired cAMP accumulation and downstream signaling, potentially at the level of cAMP-dependent protein kinase activation, contribute to reduced vascular relaxation in aged rats.