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Attenuation of the behavioral response to quisqualic acid and glutamic acid diethyl ester by chronic haloperidol administration.

Long-term neuroleptic administration produces a behavioral supersensitivity to dopamine agonists. Tyrosine hydroxylase immunoreactive synapses in the striatum are closely associated with putative glutamate-mediated synapses, on dendrites and dendritic spines of the same neuronal population. The purpose of the present study was to determine whether chronic neuroleptic administration would alter the behavioral response to glutamatergic drugs. Mice were chronically administered haloperidol for 28 days. After four days of withdrawal, behavioral activity was measured following intraventricular administration of quisqualic acid or intraperitoneal injection of glutamic acid diethyl ester. Both agents decreased behavioral activity. This response to glutamatergic drugs at low dosages was attenuated by chronic haloperidol administration. It is concluded that chronic haloperidol administration alters the behavioral responsivity of animals to glutamatergic drugs.

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