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Abstract

Effects of chronic SCH23390 treatment on the biochemical and behavioral properties of D1 and D2 dopamine receptors: potentiated behavioral responses to a D2 dopamine agonist after selective D1 dopamine receptor upregulation.

E J Hess, L J Albers, H Le and I Creese
Journal of Pharmacology and Experimental Therapeutics September 1986, 238 (3) 846-854;
E J Hess
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L J Albers
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H Le
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I Creese
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Abstract

Chronic treatment of rats with SCH23390 (0.5 mg/kg/day s.c.), a D1 dopamine receptor antagonist, for 21 days resulted in an increase in D1 dopamine receptors but produced no change in D2 dopamine receptors. During habituation to locomotor activity cages the rats treated chronically with SCH23390 showed significantly higher locomotor activity than controls treated chronically with saline. When injected with the selective D1 dopamine receptor agonist SKF38393 (3 mg/kg), rats treated chronically with SCH23390 showed significantly greater stereotypy and locomotor activity responses. Surprisingly, rats treated chronically with SCH23390 also showed significantly higher locomotor activity and stereotypy responses when treated with the selective D2 dopamine receptor agonist, quinpirole (LY171555) (0.3 mg/kg). These results indicate that a selective increase in D1 receptors may not be necessary, but is sufficient, to lead to an enhanced behavioral response to either selective D1 or D2 dopamine receptor agonists. If, indeed, an enhanced stereotypy and locomotor activity response to dopaminergic agonists in rats after a brief chronic treatment with a neuroleptic drug is predictive of tardive dyskinesia potential in the clinical setting, these results can suggest that SCH23390 may also induce tardive dyskinesia in humans. Adenylate cyclase activity stimulated by guanine nucleotides, forskolin or dopamine was enhanced after chronic treatment with SCH23390. However, dopamine-stimulated adenylate cyclase activity was not potentiated detectably by the increase in receptor number over the more general increase in guanine nucleotide-stimulated cyclic AMP production. Additionally, no change was observed in dopamine competition for [3H]SCH23390 binding, with dopamine's RH/RL ratio remaining unchanged.(ABSTRACT TRUNCATED AT 250 WORDS)

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Journal of Pharmacology and Experimental Therapeutics
Vol. 238, Issue 3
1 Sep 1986
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Abstract

Effects of chronic SCH23390 treatment on the biochemical and behavioral properties of D1 and D2 dopamine receptors: potentiated behavioral responses to a D2 dopamine agonist after selective D1 dopamine receptor upregulation.

E J Hess, L J Albers, H Le and I Creese
Journal of Pharmacology and Experimental Therapeutics September 1, 1986, 238 (3) 846-854;

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Abstract

Effects of chronic SCH23390 treatment on the biochemical and behavioral properties of D1 and D2 dopamine receptors: potentiated behavioral responses to a D2 dopamine agonist after selective D1 dopamine receptor upregulation.

E J Hess, L J Albers, H Le and I Creese
Journal of Pharmacology and Experimental Therapeutics September 1, 1986, 238 (3) 846-854;
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