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- W2160403485 abstract "The stimulant drug amphetamine is postulated to enhance dopamine release through the plasmalemmal dopamine transporter by an exchange diffusion with synaptosomal dopamine. Because protein kinase C has been shown to have an effect on dopamine transporter activity, we examined the effect of protein kinase C inhibitors on endogenous dopamine release stimulated by amphetamine in perfused rat striatal slices. At concentrations of 1 microM, the selective protein kinase C inhibitors chelerythrine, Ro31-8220 and calphostin C nearly completely inhibited endogenous dopamine release elicited by 1 microM amphetamine. The inactive analog bisindoylmaleimide V had no effect. Extracellular Ca++ was not required for the effect of the inhibitors. The importance of vesicular dopamine release was examined by determining inhibitor activity in reserpine-treated rats. Dopamine release elicited by 1 microM amphetamine was not significantly altered in reserpine-treated rats compared with control animals. Ro31-8220 at 1 microM completely blocked amphetamine-induced dopamine release in reserpine-treated rats. Activation of protein kinase C with 250 nM of the phorbol ester 12-O-tetradecanoylphorbol 13-acetate increased dopamine release, and the release was not additive with 1 microM amphetamine. Both chelerythrine and Ro31-8220 at 1 microM increased [3H]dopamine uptake by 17% and 30%, respectively, whereas a brief exposure to 12-O-tetradecanoylphorbol 13-acetate slightly inhibited [3H]dopamine uptake. Our results suggest that amphetamine-mediated dopamine release through the plasmalemmal transporter is highly dependent on protein kinase C activity." @default.
- W2160403485 created "2016-06-24" @default.
- W2160403485 creator A5002950613 @default.
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- W2160403485 date "1998-02-01" @default.
- W2160403485 modified "2023-09-29" @default.
- W2160403485 title "Protein kinase C inhibitors block amphetamine-mediated dopamine release in rat striatal slices." @default.
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