Increased [125I]sulpiride binding in the subthalamic nucleus of rats with nigrostriatal lesions.

Abstract:

:Subthalamic nucleus (STN) hyperactivity follows lesions of mesencephalic dopaminergic neurons in animal models of Parkinson's disease. The mechanism leading to sustained STN hyperactivity in parkinsonism is not well understood, but it seems not to depend on the integrity of striato-pallido-subthalamic connections (the so called indirect pathway). Sustained STN hyperactivity could result from the loss of the direct dopaminergic innervation of the STN. Here we report increased [125I]sulpiride binding in the STN of rats with 6-hydroxydopamine (6-OHDA) lesions of mesencephalic dopaminergic neurons. Furthermore, we found that chronic oral treatment with levodopa reverted the lesion-induced increase in [125I]sulpiride binding. Our results demonstrate that most STN D2-class dopamine receptors are postsynaptic to afferent dopaminergic fibers. Furthermore, they suggest that alterations of local STN dopaminergic mechanisms could play a role in the pathophysiology of parkinsonism and mediate the therapeutic/adverse effects of chronic levodopa administration.

journal_name

Neuroreport

journal_title

Neuroreport

authors

Murer MG,Ferrario J,Delfino M,Dziewczapolski G,Gershanik OS,Raisman-Vozari R

doi

10.1097/00001756-199905140-00020

subject

Has Abstract

pub_date

1999-05-14 00:00:00

pages

1501-5

issue

7

eissn

0959-4965

issn

1473-558X

journal_volume

10

pub_type

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