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pubmed-article:2126748pubmed:abstractTextThe transmitter releasing action of caffeine was studied in the absence of extracellular Ca2+ from the peripheral sympathetic nerves of the rabbit main pulmonary artery. Caffeine (10 mM) increased the release of [3H]-noradrenaline moderately, but not significantly in Ca2(+)-free (+1 mM EGTA) Krebs solution. When peripheral nerve endings/varicosities were depolarized by elevating extracellular K+ to 47.2 mM and 70.8 mM in Ca2(+)-free solution, the transmitter releasing effect of 10 mM caffeine became significant. Ca2+ removal itself transiently increased the [3H]-noradrenaline outflow. In the individual experiments the amount of the caffeine evoked transmitter release at 47.2 mM and 70.8 mM K(+)-depolarization was inversely correlated to the release evoked by Ca2(+)-removal. Our results suggest that caffeine-sensitive calcium stores are present in peripheral nerve terminals of rabbit pulmonary artery, and part of the caffeine sensitive calcium stores may discharge during Ca2(+)-removal from the extracellular solution.lld:pubmed
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pubmed-article:2126748pubmed:authorpubmed-author:MagyarKKlld:pubmed
pubmed-article:2126748pubmed:authorpubmed-author:TörökT LTLlld:pubmed
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pubmed-article:2126748pubmed:dateRevised2003-11-14lld:pubmed
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pubmed-article:2126748pubmed:articleTitleDepolarization promotes caffeine induced [3H]-noradrenaline release in calcium-free solution from peripheral sympathetic nerves.lld:pubmed
pubmed-article:2126748pubmed:affiliationDepartment of Pharmacodynamics, Semmelweis University of Medicine, Budapest, Hungary.lld:pubmed
pubmed-article:2126748pubmed:publicationTypeJournal Articlelld:pubmed
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