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Similar effect of estradiol and haloperidol on experimental tardive dyskinesia in monkeys
Authors:Paul J. B  dard, R  n   Boucher, Michel Daigle,Th  r  se Di Paolo
Affiliation:

* Laboratoire de Neurobiologie, Department of Anatomy, Laval University, Qué., Canada

Department of Molecular Endocrinology, Centre Hospitalier de l'Université Laval Québec, Qué., Canada

Abstract:In a group of ovariectomized monkeys, a persistent buccolingual dyskinesia resembling tardive dyskinesia was induced by an upper midbrain lesion. This dyskinesia was increased by apomorphine. A single dose of haloperidol (1 mg/kg) reduced the effect of apomorphine after 24 hours and caused an increase in CSF homovanillic acid. Fifteen days later, however, the response to apomorphine was markedly enhanced. Estradiol benzoate (0.5 mg sc) had a similar biphasic effect, although of lesser magnitude. In a different group of lesioned but non-dyskinetic animals, the CSF concentration of HVA also was elevated 24 hours after estradiol. These results support our hypothesis that estradiol shares several properties with neuroleptics, and in particular, reduces, then enhances the sensitivity of striatal dopaminergic receptors.
Keywords:Correspondence to: Paul J. Bédard   Laboratoire de Neurobiologie   Hôpital de l'Enfant-Jésus   1401 18e Rue   Québec   Qué.   Canada G1J 1Z4.
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