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Characterization of dopaminergic influence on striatal-nigral neurotensin systems
A A Letter1, L A Matsuda, K M Merchant
1Department of Pharmacology and Toxicology, University of Utah, Salt Lake City 84112.
Brain Research
|September 29, 1987
Abstract:
Dopamine depletion by treatment with alpha-methyl-p-tyrosine had no effect on methamphetamine-mediated increases in striatal neurotensin (NT) concentrations but significantly attenuated nigral increases; the attenuation in the nigral response was reversed by L-DOPA. Blockade of D2-receptors, with sulpiride, by itself increased striatal NT levels, while having no effect on the nigral NT system or its response to methamphetamine. In contrast, D1 blockade with SCH 23390 had no effect of its own on NT levels but significantly blocked the methamphetamine-induced actions in both the striatal and nigral NT systems.