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• W2033744194 abstract "Effects of L-DOPA (0.1-10,000 nM) on spontaneous release (Sp), evoked release (S) and tissue content (C) of dopamine (DA) were studied comparatively in superfused striatal slices from control and 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP)-treated C57 black mice to obtain evidence for L-DOPA-induced facilitation of S via presynaptic beta-adrenoceptors. In control slices, isoproterenol-induced concentration-dependent increases in S were propranolol-sensitive. L-DOPA at 0.1-3 nM tended to increase the S of DA with a concomitant tendency of increases in Sp. L-DOPA at 10-1 x 10(4) nM concentration-dependently increased Sp. L-DOPA at 1-10 microM tended to increase S and 10 microM increased C. In slices from MPTP-treated mice, the absolute amounts of Sp, S and C decreased by half compared to those in control slices. L-DOPA at 3 nM facilitated S without increasing Sp. This facilitation was antagonized by propranolol at 3 nM. L-DOPA at 30 nM decreased S from the peak facilitation, which contrasted with no effect in the control slices. However, 10-100 nM L-DOPA increased Sp more markedly than that in the control slices. L-DOPA at 100 nM increased S and C, which contrasted with no effect in the control slices. In conclusion, nanomolar L-DOPA facilitates the S of DA via presynaptic beta-adrenoceptors at concentrations lower than those required to induce conversion to DA even in striatal slices from the MPTP-treated mice model for Parkinson's disease.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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• W2033744194 date "1991-01-01" @default.
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• W2033744194 title "Nanomolar L-DOPA facilitates release of dopamine via presynaptic .BETA.-adrenoceptors: Comparative studies on the actions in striatal slices from control and 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine(MPTP)-treated C57 black mice, an animal model for parkinson's disease." @default.
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• W2033744194 doi "https://doi.org/10.1254/jjp.55.93" @default.
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