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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 

Cocaine conditioning: reversal by autoreceptor dose levels of 8-OHDPAT.

In order to investigate the contribution of serotonergic effects of cocaine to Pavlovian conditioning of cocaine locomotor stimulant effects, two experiments were conducted in which groups of rats (N=10) received cocaine treatments (10 mg/kg) paired or unpaired to placement in an open-field environment. Initially, a cocaine conditioned locomotion stimulant effect was established. Next, additional Coc-P and Coc-UP pairings were carried out in conjunction with pretreatment injections of the 5-HT1A agonist, 8-OHDPAT (0.01, 0.025 and 0.05 mg/kg) or saline. In experiment 1, the Coc-P group which received the saline pretreatment again exhibited conditioning but in the 8-OHDPAT pretreatment Coc-P group conditioning was eliminated. In the second experiment, the protocol of the first experiment was repeated but expanded in the post-conditioning phase to include an 8-OHDPAT plus the 5-HT1A antagonist pretreatment Coc-P group. As in the first experiment, the 8-OHDPAT pretreatment Coc-P group did not exhibit a cocaine conditioned locomotion stimulant effect; whereas, the saline pretreatment Coc-P and the 8-OHDPAT plus WAY-100635 pretreatment Coc-P groups did exhibit the cocaine conditioned locomotion stimulant effect. These findings are consistent with an important role for serotonin in the maintenance of cocaine Pavlovian conditioned effects.[1]

References

  1. Cocaine conditioning: reversal by autoreceptor dose levels of 8-OHDPAT. Carey, R.J., Damianopoulos, E.N., Shanahan, A.B. Pharmacol. Biochem. Behav. (2009) [Pubmed]
 
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