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A functional effect of dopamine in the nucleus accumbens and in some other dopamine-rich parts of the rat brain

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Abstract

Dopamine (5 to 50 Μg) applied bilaterally to the nucleus accumbens of reserpine-nialamide pretreated rats produced a marked dose-dependent rise in coordinated locomotor activity, devoid of stereotypies such as gnawing, rearing and licking seen after dopamine application (50 Μg) to the neostriatum. The locomotor activity was completely blocked by pimozide, but not by phenoxybenzamine. The effects of apomorphine or d-noradrenaline were similar to those of dopamine. In contrast, l-noradrenaline produced a “convulsive” syndrome devoid of coordinated locomotor activity, and this convulsive syndrome could be completely blocked by phenoxybenzamine but not by pimozide. Release of endogenous dopamine by d- or l-amphetamine (10 and 50 Μg) in the nucleus accumbens produced a rise in coordinated activity, the d-isomer was about 4 times as potent as the l-isomer, and the effect of the d-isomer was blocked completely by α-methyltyrosine. Bilateral application of trifluoperazine (2.5 Μg) to the nucleus accumbens completely blocked the effect of systemically administered d-amphetamine (1.5 and 3.0 mg/kg), but similar application to the area of the central nucleus of the amygdala or the neostriatum was much less effective. Partial protection of the endogenous dopamine stores against the depleting action of reserpine by local application of metatyramine to the nucleus accumbens resulted in a higher level of basal activity than in control animals. Application of dopamine or noradrenaline to the area of the central nucleus of the amygdala or to the olfactory tubercles did not lead to any consistent changes in locomotor activity.

The nucleus accumbens and olfactory tubercles contained most of the dopamine in the limbic forebrain, with noradrenaline more evenly distributed.

These data suggest that the nucleus accumbens plays an important role in the locomotor activity in rats.

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  1. David M. Jackson

    Present address: Department of Pharmacology, University of Sydney, 2006, NSW, Australia

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  1. Departments of Pharmacology and Histology, University of Göteborg, Göteborg, Sweden

    David M. Jackson, Nils-Erik Andén & Annica Dahlström

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Jackson, D.M., Andén, NE. & Dahlström, A. A functional effect of dopamine in the nucleus accumbens and in some other dopamine-rich parts of the rat brain. Psychopharmacologia 45, 139–149 (1975). https://doi.org/10.1007/BF00429052

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