On the selectivity and specificity of the antagonism of apomorphine-induced suppression of exploration by sulpiride.

Abstract:

:Ten behavioural variables were recorded by means of an automatic holeboard apparatus. The behaviour of rats placed for the first time in the apparatus was recorded for 10 min. The suppression of this exploratory behaviour by the dopamine agonist apomorphine (0.01-0.1 mg/kg) was shown to be reversible in a surmountable fashion by the dopamine antagonist sulpiride (2 and 4 mg/kg). Suppression of exploration induced by clonidine (0.05-0.2 mg/kg) or diazepam (2 mg/kg) was not antagonised by sulpiride (10 and 50 mg/kg, respectively). The partial dopamine D1-agonist SKF 38393 (2-20 mg/kg) also suppressed exploration but neither sulpiride (20 mg/kg) nor the D1-antagonist SCH 23390 (0.02 mg/kg) could antagonise this effect. The data show that dopamine agonist induced suppression of exploration display pharmacological characteristics of a receptor-mediated response and the data support our previous suggestion that these receptors may be pharmacologically distinct from other dopamine D2-receptors.

journal_title

Psychopharmacology

authors

Ståhle L,Ungerstedt U

doi

10.1007/BF00634456

subject

Has Abstract

pub_date

1989-01-01 00:00:00

pages

75-9

issue

1

eissn

0033-3158

issn

1432-2072

journal_volume

99

pub_type

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