Journal
NEUROPHARMACOLOGY
Volume 62, Issue 7, Pages 2288-2298Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.neuropharm.2012.01.023
Keywords
Nicotine; Self-administration; Reinstatement; Serotonin; 5-HT2A; 5-HT2C
Categories
Funding
- CIHR
- InterVivo Solutions
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The reinforcing effects of nicotine are mediated in part by brain dopamine systems. Serotonin, acting via 5-HT2A and 5-HT2C receptors, modulates dopamine function. In these experiments we examined the effects of the 5-HT2C receptor agonist Ro60-0175 and the 5-HT2A receptor antagonist (M100907, volinanserin) on nicotine self-administration and reinstatement of nicotine-seeking. Male Long-Evans rats self-administered nicotine (0.03 mg/kg/infusion, IV) on either a FR5 or a progressive ratio schedule of reinforcement. Ro60-0175 reduced responding for nicotine on both schedules. While Ro60-0175 also reduced responding for food reinforcement, response rates under drug treatment were several-fold higher than in animals responding for nicotine. M100907 did not alter responding for nicotine, or food, on either schedule. In tests of reinstatement of nicotine-seeking, rats were first trained to lever press for IV infusions of nicotine; each infusion was also accompanied by a compound cue consisting of a light and tone. This response was then extinguished over multiple sessions. Injecting rats with a nicotine prime (0.15 mg/kg) reinstated responding; reinstatement was also observed when responses were accompanied by the nicotine associated cue. Ro60-0175 attenuated reinstatement of responding induced by nicotine and by the cue. The effects of Ro60-0175 on both forms of reinstatement were blocked by the 5-HT2C receptor antagonist SB242084. M100907 also reduced reinstatement induced by either the nicotine prime or by the nicotine associated cue. The results indicate that 5-HT2C and 5-HT2A receptors may be potential targets for therapies to treat some aspects of nicotine dependence. (C) 2012 Elsevier Ltd. All rights reserved.
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