Abstract
Bilateral injections of 6-hydroxydopamine (6-OHDA) into the nucleus accumbens greatly reduced the dopamine content of this nucleus and the olfactory tubercle and blocked the ipsilateral rotation induced by amphetamine and methamphetamine in rats with unilateral 6-OHDA lesions of the caudate nucleus. In contrast, apomorphine-induced contralateral rotation was enhanced. Similar results were obtained when the destruction of forebrain noradrenergic neurons, normally produced by the nucleus accumbens 6-OHDA lesion, was prevented by desipramine (DMI) pretreatment. Microinjections of the dopamine receptor antagonist haloperidol into the nucleus accumbens did not spread to the olfactory tubercle, as assessed by the distribution of 3H-haloperidol, and blocked circling induced by amphetamine and apomorphine. Amphetamine-induced circling was less effectively blocked by haloperidol injected into the olfactory tubercle. These results suggest that activity at nucleus accumbens dopamine receptors can greatly affect circling behavior, perhaps by amplifying asymmetries of nigrostriatal activity.
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Kelly, P.H., Moore, K.E. Mesolimbic dopamine neurons: Effects of 6-hydroxydopamine-induced destruction and receptor blockade on drug-induced rotation of rats. Psychopharmacology 55, 35–41 (1977). https://doi.org/10.1007/BF00432814
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DOI: https://doi.org/10.1007/BF00432814