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The enhanced oral response to the 5-HT sub(2) agonist Ro 60-0175 in parkinsonian rats involves the entopeduncular nucleus: electrophysiological correlates
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The enhanced oral response to the 5-HT sub(2) agonist Ro 60-0175 in parkinsonian rats involves the entopeduncular nucleus: electrophysiological correlates
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The enhanced oral response to the 5-HT sub(2) agonist Ro 60-0175 in parkinsonian rats involves the entopeduncular nucleus: electrophysiological correlates
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Journal Article
The enhanced oral response to the 5-HT sub(2) agonist Ro 60-0175 in parkinsonian rats involves the entopeduncular nucleus: electrophysiological correlates
2013
Overview
Lesions of nigrostriatal dopaminergic neurons as seen in Parkinson's disease (PD) increase orofacial responses to serotonergic (5-HT) agonists in rodents. Although this response to 5-HT agonists has been related to aberrant signalling in the basal ganglia, a group a subcortical structures involved in the control of motor behaviours, it deserves additional studies with respect to the specific loci involved. Using measurements of orofacial activity, as well as single-cell recordings in vivo, we have studied the role of the entopeduncular nucleus (EPN; equivalent to the internal globus pallidus of primates), an output structure of basal ganglia, in the hypersensitized responses to a 5-HT agonist in sham- or unilaterally dopamine-depleted rats. Intra-EPN injections of Ro 60-0175 (0.3 and 1 mu g/100 nl) promoted robust oral movements in 6-OHDA rats without affecting oral activity in sham-depleted rats. Peripheral administration of Ro 60-0175 (3 mg/kg ip) decreased EPN neuronal firing rate in 6-OHDA rats compared to sham-depleted rats. Such an effect was also observed when the agonist (0.2 mu g/20 nl) was locally applied onto EPN neurons. These data demonstrate the contribution of EPN to hypersensitized responses to 5-HT agonists in a rat model of PD.
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