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Parkinson disease is a common neurodegenerative disorder that leads to difficulty in effectively translating thought into action. Although it is known that dopaminergic neurons that innervate the striatum die in Parkinson disease, it is not clear how this loss leads to symptoms. Recent work has implicated striatopallidal medium spiny neurons (MSNs) in this(More)
In the 6-hydroxydopamine model of Parkinson's disease in the rat, there is a significant reduction in the number of dendritic spines on the principal projection neurons in the neostriatum, presumably attributable to loss of the nigrostriatal dopamine input. These spines invariably receive input from terminals forming asymmetric synapses that originate(More)
Golgi-impregnated medium-size spiny neurones were studied in the rat neostriatum at various times after a unilateral 6-hydroxydopamine lesion of the medial forebrain bundle. At both short (12-26 days) and long (7-12 months) survival times, the density of spines was significantly lower (13%) on neostriatal neurones ipsilateral to the 6-hydroxydopamine(More)
After the unilateral destruction of the dopamine input to the neostriatum there are enduring changes in rat behaviour. These have been ascribed to the loss of dopamine and the animals are often referred to as 'hemiparkinsonian'. In the denervated neostriatum, we have shown that not only are the tyrosine hydroxylase positive boutons missing, but also the(More)
Dendritic spines are important structures which receive synaptic inputs in many regions of the CNS. The goal of this study was to test the hypothesis that numbers of dendritic spines are significantly reduced on spiny neurones in basal ganglia regions in Parkinson's disease as we had shown them to be in a rat model of the disease [Exp Brain Res 93 (1993)(More)
Antibodies against substance P and choline acetyltransferase (ChAT) have been used in a sequential double-immunocytochemical ultrastructural study of the rat forebrain. The peroxidase-anti-peroxidase procedure was used for both antigens, however, two different substrates for the peroxidase reactions were used. The substance P-immunoreactive sites were first(More)
We have previously reported that mGluR5 signaling via PLC-beta1 regulates the development of whisker patterns within S1 (barrel) cortex of mice (Hannan et al., 2001). However, whether these defects arise from the loss of postsynaptic mGluR5 signaling, and whether the level of mGluR5 is important for barrel formation, was not examined. Furthermore, whether(More)
Three morphologically distinct types of neuron that contain acetylcholinesterase have been distinguished by Golgi-impregnation of sections of the rat neostriatum that had been incubated to reveal acetylcholinesterase activity. The neuron that stained most intensely for acetylcholinesterase was a large cell, with smooth or sparsely spiny dendrites; the axon(More)