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- W2052511140 abstract "The present studies were carried out to determine the effects of a κ-opioid receptor agonist on cytosolic Ca2+ concentration, [Ca2+]i, and extracellular dopamine in undifferentiated PC12 cells. The κ-opioid receptor agonist U-50,488H caused concentration-dependent increases in [Ca2+]i and extracellular dopamine. Neither effect was blocked by the selective κ-opioid receptor antagonist nor-binaltorphimine. Increases in extracellular dopamine content and [Ca2+]i caused by U-50,488H were correlated positively in the presence of extracellular Ca2+; however, reduction of extracellular Ca2+ abolished the increase in [Ca2+]i, but not that in dopamine. The latter observation suggests that stimulation of exocytotic release is not the primary mechanism involved in the increase in extracellular dopamine caused by U-50,488H. Effects on dopamine synthesis or catabolism also seem unlikely because the enhancement of extracellular dopamine occurred rapidly, and the amount of a major metabolite of dopamine, 3,4-dihydroxyphenylacetic acid (DOPAC), was not affected. In any event, neither the increase in [Ca2+]i nor the increase in extracellular dopamine caused by U-50,488H is mediated by the κ-opioid receptor. © 2003 Wiley-Liss, Inc." @default.
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- W2052511140 date "2003-10-21" @default.
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- W2052511140 title "Nonopioid receptor-mediated effects of U-50,488H on [Ca2+]i and extracellular dopamine in PC12 cells" @default.
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- W2052511140 doi "https://doi.org/10.1002/jnr.10801" @default.
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