by Liao RM., Department of Psychology, Research Center for Mind, Brain and Learning,
Graduate Institute of Life Science, National Cheng-Chi University, Taipei, Taiwan.
Pharmacol Biochem Behav. 2008 Jan 24
The present study investigated the role of dopamine receptors within the nucleus accumbens in place conditioning induced by d-amphetamine. Previous work has shown that conditioned place preference can be established by intra-accumbens infusion of amphetamine. The present study further examined whether bilateral co-infusion of the selective dopamine receptor antagonists with d-amphetamine into this region would disrupt the development of conditioned place preference induced by intra-accumbens amphetamine treatment. Bilateral infusions of d-amphetamine into the nucleus accumbens at the dose of 10 mug per side significantly induced conditioned place preference. At the tested doses of 1 mug and 10 mug, either the selective D1 dopamine receptor antagonist (SCH23390) or the selective D2 dopamine receptor antagonist (raclopride) infused with the high dose into the nucleus accumbens significantly blocked the development of conditioned place preference induced by intra-accumbens amphetamine treatment. Furthermore, the sole infusion of SCH23390 or raclopride into the nucleus accumbens produced little or no place conditioning effect. It is concluded that the dopamine D1 and D2 receptors in the nucleus accumbens are critically involved in the development of amphetamine induced conditioned place preference.