Characterization of the role of medial prefrontal cortex dopamine receptors in cocaine-induced locomotor activity |
| |
Authors: | Beyer C E Steketee J D |
| |
Affiliation: | Department of Pharmacology and Therapeutics, School of Graduate Studies, Louisiana State University Health Sciences Center, USA. |
| |
Abstract: | Medial prefrontal cortex (mPFC) dopamine (DA) modulates the motor-stimulant response to cocaine. The present study examined the specific mPFC DA receptor subtypes that mediate this behavioral response. Intra-mPFC injection of the DA D2-like receptor agonist quinpirole blocked cocaine-induced motor activity, an effect that was prevented by coadministration of the D2 receptor antagonist sulpiride. Intra-mPFC injection of the selective D4 receptor agonist PD 168,077 or the selective D1 receptor agonist SKF 81297 did not alter the motor-stimulant response to cocaine. Finally, it was found that an intermediate dose of quinpirole, which only attenuated cocaine-induced motor activity, was not altered by SKF 81297 coadministration, suggesting a lack of synergy between mPFC D1 and D2 receptors. These results suggest that D2 receptor mechanisms in the mPFC are at least partly responsible for mediating the acute motor-stimulant effects of cocaine. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|