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Aging and platelet beta-adrenoceptor function.

K Winther, O Naesh

    European Journal of Pharmacology
    |April 14, 1987
    PubMed
    Summary
    This summary is machine-generated.

    Elderly individuals exhibit increased platelet aggregation due to adrenaline. This is linked to reduced beta-adrenoceptor function, impacting cyclic AMP response and isoprenaline stimulation in older adults.

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    Area of Science:

    • Cardiovascular Research
    • Gerontology
    • Pharmacology

    Background:

    • Platelet aggregation plays a crucial role in hemostasis and thrombosis.
    • Age-related changes in cardiovascular function are well-documented.
    • Beta-adrenoceptor function can be influenced by aging.

    Purpose of the Study:

    • To investigate age-related differences in platelet aggregation and beta-adrenoceptor function.
    • To compare adrenaline-induced platelet aggregation between young and elderly volunteers.
    • To assess cyclic AMP (cAMP) levels and beta-adrenoceptor binding in response to stimulation.

    Main Methods:

    • In vitro testing of platelet aggregation induced by adrenaline.
    • Measurement of platelet cyclic AMP (cAMP) levels before and after isoprenaline stimulation.

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  • Quantification of beta-adrenoceptor binding using 125I-hydroxybenzylpindolol.

    • Main Results:

    • Elderly subjects showed significantly lower adrenaline concentrations required for irreversible platelet aggregation.
    • Platelet cAMP response to isoprenaline stimulation was significantly reduced in older adults.
    • Beta-adrenoceptor number remained unchanged, but affinity significantly decreased in the elderly group.

    Conclusions:

    • Increased adrenaline-induced platelet aggregation in the elderly may be partly attributed to diminished beta-adrenoceptor functional capacity.
    • Age-related alterations in platelet beta-adrenoceptors affect cellular signaling pathways.
    • These findings highlight potential mechanisms underlying cardiovascular changes in aging populations.