Dopamine‐denervated rat striata exhibit increased synaptosomal gamma‐aminobutyric acid (GABA) synthetic capacity (glutamate decarboxylase activity) without an alteration in GABA transport capacity. Stimulating denervated striatal dopamine receptors with apomorphine selectively increases in vivo steadystate striatal GABA turnover. The striatal response in animals to isolated loss of dopamine innervation is an increase in glutamate decarboxylase activity, not the decrease frequently found in the brains of patients with Parkinson's disease. Neurochemical expression of denervated striatal dopamine receptor stimulation may involve increased synaptic activity of striatal GABA neurons. For these reasons, enhancement of basal ganglia GABA function may improve responsiveness to dopamimetic therapies in patients with Parkinson's disease.
Annals of Neurology – Wiley
Published: Feb 1, 1986
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