Dissimilarities between cholinergic and dopaminergic turning elicited by nucleus accumbens stimulation in freely moving rats
Abstract
Contralateral turning was produced by unilateral injection of carbachol (0.5, 2.5, 5 micrograms) into the nucleus accumbens, but not into the dorsal or ventral striatum. This behaviour was inhibited by muscarinic M1 acetylcholine receptor blockade in the nucleus accumbens, and less effectively by blockade of muscarinic M2 and nicotinic acetylcholine receptors. Unilateral injection of a mixture of the dopamine D1 receptor agonist 1-phenyl-2,3,4,5-tetrahydro-1H-3-benzazepine-7,8-diol (SKF 38393, 5 micrograms) and the dopamine D2 receptor agonist quinpirole (10 micrograms) also produced contralateral turning. The stepping pattern, however, completely differed from that induced by carbachol. The number of carbachol-induced turnings was reduced by dopamine D1 or D2 receptor blockade (8-chloro-2,3,4,5-tetrahydro-3-methyl-5-phenyl-1H-3-benzazepine-7-ol (SCH 23390) and l-sulpiride, respectively) in the nucleus accumbens. However, the reduction was due to a change in the turning pattern. Blockade of muscarinic acetylcholine receptors in the nucleus accumbens did not change the contralateral turning induced by unilateral injection of dopamine receptor agonists into the nucleus accumbens. The results demonstrate that there is no functiona...Continue Reading
References
Role of the nucleus accumbens and the striatum in the production of turning behaviour in intact rats
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