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Related Experiment Videos

Beta-adrenergic function in aging. Basic mechanisms and clinical implications.

P J Scarpace1, N Tumer, S L Mader

  • 1Geriatric Research, Education and Clinical Center, Department of Veterans Affairs Medical Center, Gainesville, Florida.

Drugs & Aging
|March 1, 1991
PubMed
Summary
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Aging alters beta-adrenergic function, decreasing receptor-effector coupling and adenylate cyclase activity. This impacts autonomic functions and drug responses in the elderly, necessitating careful therapeutic selection.

Area of Science:

  • Endocrinology
  • Neuroendocrinology
  • Cardiovascular Physiology
  • Gerontology

Background:

  • Catecholamines are vital for autonomic functions.
  • Aging impairs beta-adrenergic function, affecting cardiovascular responses and therapy efficacy.
  • Intrinsic muscle contractility is preserved, but receptor-effector coupling is altered with age.

Purpose of the Study:

  • To investigate the impact of aging on beta-adrenergic receptor function and cellular signaling.
  • To understand age-related changes in receptor density, affinity, and downstream signaling pathways.
  • To evaluate the implications of these changes for therapeutic interventions in the elderly.

Main Methods:

  • Review of existing literature on age-related changes in catecholamine signaling.

Related Experiment Videos

  • Analysis of beta-adrenergic receptor density and function in various tissues across age groups (rats and humans).
  • Assessment of adenylate cyclase activity and cyclic adenosine monophosphate (cAMP) production in response to stimulation.

    • Main Results:

    • Beta-adrenergic receptor density shows variable changes with age; high-affinity receptors decrease in most human tissues.
    • Adenylate cyclase activity and cAMP production are reduced with age, independent of receptor changes.
    • Plasma noradrenaline increases with age, suggesting receptor desensitization, but older animals show impaired desensitization.
    • Post-receptor alterations in catalytic unit activity occur with age.

    Conclusions:

    • Aging leads to reduced beta-adrenergic receptor responsiveness and impaired signaling pathways.
    • These age-related changes affect autonomic functions and drug responses in the elderly.
    • Clinical management requires consideration of age, comorbidities, and polypharmacy for beta-adrenergic therapies.