Amphetamine and apomorphine responses in the rat following 6-OHDA lesions of the nucleus accumbens septi and corpus striatum - PubMed (original) (raw)
Amphetamine and apomorphine responses in the rat following 6-OHDA lesions of the nucleus accumbens septi and corpus striatum
P H Kelly et al. Brain Res. 1975.
Abstract
Eight mug of 6-hydroxydopamine (6-OHDA) injected bilaterally into the nucleus accumbens septi (NAS) or the caudate nucleus of the rat resulted in 79% and 50% depletion of endogenous dopamine (DA) at these respective sites. Fourteen days after the injection a low dose of amphetamine failed to induce the characteristic locomotor response in the NAS-lesioned rats but did so in the caudate-lesioned animals. By contrast the caudate lesion, but not the NAS lesions, abolished intense forms of stereotyped behaviour induced by higher doses of amphetamine. Both lesioned groups exhibited supersensitivity to the dopamine agonist, apomorphine; the NAS group showed enhanced locomotor activity and the caudate group enhanced stereotyped behaviour. The block of amphetamine locomotion and the enhanced response to apomorphine were maximal around 14 days after the operation and gradually attenuated up to 90 days. Theer is evidence that remaining DA levels in the NAS are greater at 90 than at 14 days postoperatively. Thus recovery of behavioural effects correlated with an increase in the remaining levels of DA in the NAS.
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