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Related Experiment Videos

Adrenoceptor coupling mechanisms which regulate salivary secretion during aging

A Miyamoto1, T Araiso, T Koyama

  • 1Department of Pharmacology, School of Medicine, Sapporo Medical University, Japan.

Life Sciences
|January 1, 1993
PubMed
Summary

Aging alters alpha 1-adrenergic signaling in rat parotid glands, reducing potassium (K+) efflux and inositol phosphate formation. Membrane changes, including reduced cholesterol and viscosity, may influence these age-dependent adrenoceptor functions.

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Area of Science:

  • Physiology
  • Cell Biology
  • Gerontology

Background:

  • Adrenoceptor signaling pathways are crucial for regulating cellular functions in salivary glands.
  • Aging is associated with significant physiological changes, including alterations in membrane properties and receptor function.

Purpose of the Study:

  • To investigate age-related changes in adrenoceptor-stimulated signaling in rat parotid glands.
  • To determine the impact of aging on specific adrenoceptor pathways (alpha 1 and beta) and membrane characteristics.

Main Methods:

  • Studied parotid slices and membranes from Wistar rats of different ages (2, 12, 24 months).
  • Assessed adrenoceptor-stimulated potassium (K+) fluxes, [3H]inositol phosphate formation, and cAMP production.
  • Analyzed membrane cholesterol content and viscosity.

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Main Results:

  • Norepinephrine-stimulated K+ efflux and [3H]inositol phosphate formation via alpha 1-adrenergic mechanisms decreased with age (20% and 40%, respectively).
  • Beta-adrenoceptor stimulation with isoproterenol showed no age-related changes in K+ influx or cAMP production.
  • Aging led to reduced membrane cholesterol content and decreased membrane viscosity.

Conclusions:

  • Alterations in the parotid gland membrane environment during aging may modulate alpha 1-adrenoceptor coupling and function.
  • Specific adrenoceptor pathways exhibit differential sensitivity to the aging process.