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Duration-dependent increase in striatal glutamate following prolonged fluphenazine administration in rats

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Abstract

Chronic neuroleptic administration has been shown to selectively increase striatal extracellular glutamate concentration. In the current study, age-matched female rats were administered chronic oral fluphenazine or no drug via their drinking water for 3 or 32 weeks. Microdialysis probes were inserted into the ventrolateral caudate putamen and the medial nucleus accumbens and dialysis samples were analyzed for glutamate and γ-aminobutyric acid (GABA) concentrations. Glutamate levels were significantly increased only in the ventrolateral caudate putamen after 32 weeks. No significant effects were seen for GABA levels. Neuroleptic-induced enhancement of striatal glutamate levels thus appears to increase with chronic exposure and this increase may relate to late onset motor side effects.

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