Abstract
The locomotor stimulatory effects of the dopamine D1 receptor partial agonist SKF 38393 were examined in male C57B1/6J mice. Non-habituated mice showed marked dose-related (3–300 mg/kg, SC) locomotor stimulation. The time-course effect was biphasic at very high doses (100–300 mg/kg), with dose-related locomotor depression followed by dose-related long-term hyperlocomotion. For all doses, locomotor effects were detectable throughout the 4-h test period. To determine whether these effects were mediated by D1 receptor stimulation, effects of SKF 38393 were assessed in combination with behaviorally inactive and active doses (0.1 and 0.2 mg/kg, respectively) of the selective D1 receptor antagonist SCH 39166. Both doses of SCH 39166 attenuated the hyperlocomotion induced by 30 mg/kg of the agonist to a similar degree. However, neither dose was able to reverse either the depressant or the stimulatory effects of 300 mg/kg SKF 38393. These results demonstrate effects of the prototypical D1 agonist previously unobserved, and raise questions concerning the nature of agonist/antagonist interactions at the D1 receptor subtype.
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Tirelli, E., Terry, P. Biphasic locomotor effects of the dopamine D1 agonist SKF 38393 and their attenuation in non-habituated mice. Psychopharmacology 110, 69–75 (1993). https://doi.org/10.1007/BF02246952
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DOI: https://doi.org/10.1007/BF02246952