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pubmed-article:7583792pubmed:abstractTextThe purpose of this study was to determine if the age-related decrease in norepinephrine (NE) release from cardiac adrenergic nerve terminals is due to a defect in Ca2+ movement into the nerve terminal or to an alteration in Ca2+ activation of intracellular events leading to NE release. NE release was assessed in cardiac synaptosomes prepared from 6- and 24-month-old male F344 rats. K(+)-induced NE release was significantly greater in young vs old rats. Raising extracellular [Ca2+] increased NE release, but NE release always remained higher in the younger animals. Ionomycin, a Ca2+ ionophore, induced NE release from cardiac synaptosomes, and there was no age difference in the response. The age-related reduction in NE release induced by K+ and the capacity of ionomycin to induce similar NE release in young and old cardiac synaptosomes points to a reduction in Ca2+ movement during depolarization.lld:pubmed
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pubmed-article:7583792pubmed:dateRevised2007-11-14lld:pubmed
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pubmed-article:7583792pubmed:articleTitleAge-related changes in cardiac norepinephrine release: role of calcium movement.lld:pubmed
pubmed-article:7583792pubmed:affiliationDepartment of Pharmacology, Medical College of Pennsylvania, Philadelphia, USA.lld:pubmed
pubmed-article:7583792pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:7583792pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed