Recent reports suggested the involvement of serotonergic mechanisms in nicotine self-administration. The present study assessed the effects of sertraline, a selective serotonergic uptake inhibitor, on the reinforcing effects of i.v. nicotine (30 μg/kg per injection) in squirrel monkeys responding under a fixed-ratio schedule. Nicotine (10-100 μg/kg per injection) produced a significant inverted U-shaped distribution on FR rate. Vehicle or sertraline (3, 6, 12, 24 mg/kg, p.o.) produced no changes in the response rates maintained by 30 μg/kg per injection i.v. nicotine, but sertraline produced non-significant increases response rates maintained by 10 μg/kg per injection nicotine and vehicle. In a separate group of monkeys, sertraline given in combination with i.m. doses of nicotine produced a significant dose-dependent decrease in responding maintained by food-pellet delivery. Thus, setraline produced differential effects on response rates that may be related to (1) route of nicotine administration and (2) whether the behavior was maintained by nicotine or food. In addition, the results of the self-administration study suggest that sertraline would not disrupt well-maintained responding for nicotine.
- (5-hydroxytryptamine, serotonin)
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