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- W1990778322 abstract "Phenylephrine increased [3H]norepinephrine efflux and accumulation of cyclic AMP in cultured rat superior cervical ganglion cells superfused with Tyrode's solution. The purpose of this study was to determine the mechanism and relationship between these two events. Electrical stimulation (1-2 Hz), potassium chloride (50 mM), and the preferential alpha 1-adrenergic receptor agonist phenylephrine (1-100 microM) increased fractional tritium efflux, whereas methoxamine, cirazoline, and amidephrine were relatively ineffective. Phenylephrine, but not methoxamine and cirazoline, also increased cyclic AMP accumulation. Phenylephrine-induced tritium efflux was not altered by alpha- and beta-adrenergic receptor antagonists or by removal of extracellular calcium. Phenylephrine-induced cyclic AMP accumulation was blocked by the beta-adrenergic receptor antagonists propranolol and atenolol. Forskolin (10 microM) and the nonhydrolyzable cyclic AMP analogue 8-(4-chlorophenylthio)cyclic AMP (100 microM) had minimal effect on tritium efflux. However, phenylephrine-evoked increase in tritium efflux was dose dependently attenuated by the neuronal uptake blocker cocaine, and phenylephrine dose-dependently inhibited the incorporation of [3H]norepinephrine into neuronal stores. We conclude that the increase in tritium efflux induced by phenylephrine is independent of cyclic AMP accumulation and appears to be mediated by uptake of phenylephrine via the neuronal carrier-mediated amine transport process, which in turn promotes efflux of the adrenergic transmitter from its storage sites." @default.
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- W1990778322 date "1991-09-01" @default.
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- W1990778322 title "Mechanism of Neurotransmitter Release Elicited by the Preferential ?1-Adrenergic Receptor Agonist Phenylephrine in Superfused Superior Cervical Ganglion Cells in Culture" @default.
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- W1990778322 doi "https://doi.org/10.1111/j.1471-4159.1991.tb08226.x" @default.
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