Partial agonistic action of clozapine at dopamine D2 receptors in dopamine depleted animals

被引:0
|
作者
I. Ninan
S. K. Kulkarni
机构
[1] Pharmacology Division,
[2] University Institute of Pharmaceutical Sciences,undefined
[3] Panjab University,undefined
[4] Chandigarh 160014,undefined
[5] India,undefined
来源
Psychopharmacology | 1998年 / 135卷
关键词
Key words Clozapine; SKF 38393; Partial agonist; Stereotypy; Locomotion;
D O I
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中图分类号
学科分类号
摘要
 In the present experiments, the locomotor and stereotypic stimulant effects of the atypical antipsychotic agent, clozapine were studied in mice depleted of their brain dopamine by reserpine and alpha-methyl-p-tyrosine pretreatment. Clozapine at a dose of 1mg/kg produced slight stimulation of locomotor activity, but failed to produce any stereotypy. However, clozapine at 0.5 or 2 mg/kg failed to show increase in locomotor activity or stereotypy. Clozapine potentiated the locomotor activity and stereotypy induced by selective dopamine D1 receptor agonist, SKF 38393 but blocked locomotor activity and stereotypy induced by dopamine D2 agonist, B-HT 920 (1 mg/kg) and stereotypy induced by higher dose of B-HT 920 (2 mg/kg). The synergistic action of clozapine and SKF 38393 was partially blocked by the dopamine D1 selective antagonist SCH 23390 and the dopamine D2 selective antagonist, sulpiride, respectively. Clozapine potentiated the stereotypy induced by apomorphine (0.5 and 1 mg/kg) but did not affect locomotor stimulating activity of apomorphine. These behavioral effects of clozapine suggested that it has partial agonistic action at dopamine D2 receptors.
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页码:311 / 317
页数:6
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