Abstract
The effects of continuous treatment with haloperidol (HAL) or fluphenazine (FLU) for 10 months on dopamine and GABA receptors in the rat brain was examined using in vitro autoradiography. Rats treated with HAL, but not FLU, showed an increase in D-2 receptor binding in the caudate-putamen as revealed by [3H]spiperone. Labeling of D-1 receptors by [3H]SCH23390 revealed no changes in either drug-treated group. Both drug-treated groups, however, exhibited a significant increase in [3H]muscimol binding in substantia nigra, pars reticulata (SNR). These dopaminergic-GABAergic receptor alterations may be related to previously reported changes in oral movement activity seen in these neuroleptic-treated animals.
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