Abstract
In Parkinson's disease the dopaminergic inhibition--mediated by DA2 receptors in the striatum--is reduced. Therefore glutamatergic excitation predominates in the antero-dorsal striatum. In turn the glutamatergic neurons of the subthalamic nucleus become disinhibited. Antagonists of the NMDA-subtype of glutamate receptors injected locally into the glutamatergically innervated nuclei or competitive and non-competitive NMDA-antagonists administered systemically, counteract parkinsonian symptoms in animals.
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