Antagonism by 8-OH-DPAT, but not ritanserin, of catalepsy induced by SCH 23390 in the rat

Publisher Website
Google Scholar
Abstract
In the present experiments, it was shown that the catalepsy induced by the dopamine D1 antagonist SCH 23390 (0.2 mgkg−1 sc), was completely antagonised by the administration of 8-OH-DPAT (0.1 mg kg−1 sc) for the duration of the effect of SCH 23390 (approx. 120 min). Neither the catalepsy induced by raclopride (16 mg kg−1 sc) nor that induced by SCH 23390 (0.2 mg kg−1 sc) could be antagonised by treatment with the 5-HT2 receptor antagonist ritanserin (0.13–2.0 mg kg−1 sc). Administration of SCH 23390 (0.0125–0.2 mg kg−1 sc) produced a significant suppression of avoidance behavior at all doses, and also produced a significant decrease in the number of intertriai crosses. At the higher doses, 0.05 and 0.2 mg kg−1 sc, there were also escape failures. In contrast to the finding in our previous report that raclopride and 8-OH-DPAT in a synergistic manner produce a suppression of conditioned avoidance behavior, no such interaction was found between 8-OH-DPAT (0.1 mg kg−1 sc) and SCH 23390 (6 μg kg−1 sc) in the present study.

This publication has 25 references indexed in Scilit: