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Second-order schedules of nicotine reinforcement in rats: effect of AM251

Lookup NU author(s): Dr Victoria Wing, Dr Mohammed Shoaib

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Abstract

The endocannabinoid system has been implicated in the motivational effects of nicotine and nicotine-associated stimuli but the neural circuitry underlying tobacco addiction is not fully characterised. The present study aimed to establish a second-order schedule of nicotine reinforcement to compare the role of the endocannabinoid system in nicotine- and cue-maintained responding. The male rats were successfully trained to respond on a second-order schedule [FR5 (FR5: S) or FI 10' (FR3: S)] under which presentation of the CS (brief light oscillation) was intermittently reinforced by nicotine (0.03 mg/kg/infusion). The relative contribution of nicotine and the CS towards responding was then compared. Nicotine and the CS were only able to independently maintain responding to similar level under the [FI 10' (FR3: S)] schedule, which was subsequently employed to examine the effects of the selective CB1 receptor antagonist AM251. AM251 (0.1, 0.3 and 1 mg/kg, intraperitoneal [i.p.]) was used to examine the role of endocannabinoids in responding under the second-order schedule and responding maintained by independent presentation of nicotine and the CS. Responding under the second-order schedule was dose-dependently attenuated by AM251, whereas responding for independent presentation of nicotine and the CS was not affected. The establishment of second-order schedules of nicotine reinforcement in rodents highlighted the utility of such schedules for investigation of the neurobiology that underlies nicotine- and cue-maintained behaviour. Additionally, the role of CB1 receptors in nicotine-motivated behaviours was extended to those controlled under a second-order schedule.


Publication metadata

Author(s): Wing VC, Shoaib M

Publication type: Article

Publication status: Published

Journal: Addiction Biology

Year: 2010

Volume: 15

Issue: 4

Pages: 393-402

Print publication date: 10/03/2010

ISSN (print): 1355-6215

ISSN (electronic): 1369-1600

Publisher: Wiley-Blackwell Publishing Ltd.

URL: http://dx.doi.org/10.1111/j.1369-1600.2009.00204.x

DOI: 10.1111/j.1369-1600.2009.00204.x


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