Toward an understanding of the role of glutamate in experimental parkinsonism: agonist-sensitive sites in the basal ganglia.

Abstract:

:Increased glutamatergic transmission in the basal ganglia is implicated in the pathophysiology of Parkinson's disease. However, the mechanisms by which activation of glutamate receptors produce parkinsonism are unknown. Therefore, we examined whether the glutamate agonists N-methyl-D-aspartate (NMDA), alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionate (AMPA), kainate, and trans-(+/-)-1-amino-1,3-cyclopentanedicarboxylate produce parkinsonism in rats after microapplication into different subregions of the basal ganglia. Electromyographic activity was used as a measure of parkinsonian rigidity. We found that in the rostral striatum, excitation mediated by NMDA but not by non-NMDA receptors led to parkinsonism. In the substantia nigra pars reticulata, internal pallidal segment/entopeduncular nucleus, and subthalamic nucleus, activation of AMPA/kainate and metabotropic receptors but not of NMDA receptors led to parkinsonian rigidity. Rigidity occurred also in animals bearing ibotenate-induced lesions of the posterior part of the striatum and of the external pallidal segment, but not in animals with lesions of the anterior striatum, subthalamic nucleus, internal pallidal segment/entopeduncular nucleus, or substantia nigra pars reticulata. These observations suggest that the activation of glutamate receptor subtypes in the basal ganglia may be differentially involved in the expression of parkinsonian symptoms.

journal_name

Ann Neurol

journal_title

Annals of neurology

authors

Klockgether T,Turski L

doi

10.1002/ana.410340413

subject

Has Abstract

pub_date

1993-10-01 00:00:00

pages

585-93

issue

4

eissn

0364-5134

issn

1531-8249

journal_volume

34

pub_type

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