Journal article
Effect of Aging on A1-Adenosine Receptor-Mediated Inhibition of Norepinephrine Release in the Rat Heart
Journal of cardiovascular pharmacology, v 31(3), pp 352-358
Mar 1998
PMID: 9514178
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Adenosine inhibits norepinephrine (NE) release from cardiac adrenergic nerves and reduces the postsynaptic β-adrenergic mediated actions of NE, leading to decreased myocardial force of contraction. The actions of adenosine are mediated by pre- and postsynaptic adenosine A1 receptors (A1-AdoR). We reported that adenosine inhibition of postsynaptic β-adrenergic receptor-mediated cyclic adenosine monophosphate (cAMP) production declines with age in male F344 rat hearts. In this study, cardiac synaptosomes, isolated intact adrenergic nerve terminals, were used to examine the effect of age on adenosine inhibition of NE release. Cardiac synaptosomes were prepared from the hearts of 6- and 24-month-old male F344 rats, loaded with [H]NE, and placed in a superfusion system. [H]NE release was induced by high [K] exposure in the presence of varying concentrations of adenosine or the specific A1-AdoR agonist, N-p-sulfophenyladenosine (SPA). [H]NE release was significantly reduced in old rats compared with young rats. Inhibition of [H]NE release by adenosine and SPA was significantly greater in young rats compared with old rats. The A1-AdoR antagonist, 8-(p-sulfophenyl)-theophylline, blocked the actions of adenosine on [H]NE release, and the specific adenosine A2-receptor agonist, cyclopropylcarboxamidoadenosine, had no effect on [H]NE release. Our data suggest that presynaptic A1-AdoR-mediated inhibition of NE release in the rat heart declines with age.
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Details
- Title
- Effect of Aging on A1-Adenosine Receptor-Mediated Inhibition of Norepinephrine Release in the Rat Heart
- Creators
- David Snyder - Departments of Pharmacology and †Medicine, MCP-Hahnemann School of Medicine, Allegheny University of the Health Sciences, Philadelphia, Pennsylvania, U.S.AWenjing WangAmir PellegEitan FriedmanJoel HorwitzJay Roberts
- Publication Details
- Journal of cardiovascular pharmacology, v 31(3), pp 352-358
- Publisher
- Lippincott-Raven Publishers
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Pharmacology and Physiology
- Web of Science ID
- WOS:000072247800004
- Scopus ID
- 2-s2.0-0031594118
- Other Identifier
- 991014877758604721
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InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Cardiac & Cardiovascular Systems
- Pharmacology & Pharmacy