Abstract
Rationale
The CB1 receptor antagonist SR141716A reduces food intake in rats. This effect is likely to depend on modulation of reward related processes.
Objective
To investigate the effects of SR141716A on responding for food under a second order instrumental task in which responding and consumption of food can be separated, and on Pavlovian responding for a stimulus predictive of food reward.
Methods
Instrumental responding and pellet consumption following administration of SR141716A (0–3 mg/kg) were recorded under an FI5 min FR5(5:S) operant schedule that incorporates both a 5 min initial appetitive phase and a 25 min consummatory phase. We compared the drug-induced change in responding to that recorded following a reduction in motivational state induced by pre-feeding. In a second experiment we assessed the effects of SR141716A (0–3 mg/kg) on Pavlovian approach behaviour for a stimulus (lever) associated with food reward (CS+) and a neutral stimulus (lever) not associated with reward (CS−).
Results
SR141716A reduced pellet consumption and instrumental responding during both the appetitive and consummatory phases of the second order schedule. Pre-feeding had a similar effect on responding during the appetitive phase, suggesting an effect on incentive motivation. SR141716A also blocked an enhancement of responding that occurred during the consummatory phase in pre-fed animals. SR141716A and pre-feeding had no effect on responding in the Pavlovian autoshaping paradigm.
Conclusions
SR141716A impacts on motivational processes in both the appetitive and consummatory phases of feeding behaviour.
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Acknowledgement
Z.T.-J. was supported by a MRC Industrial Collaborative Studentship with Vernalis Research Ltd.
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Thornton-Jones, Z.D., Vickers, S.P. & Clifton, P.G. The cannabinoid CB1 receptor antagonist SR141716A reduces appetitive and consummatory responses for food. Psychopharmacology 179, 452–460 (2005). https://doi.org/10.1007/s00213-004-2047-8
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DOI: https://doi.org/10.1007/s00213-004-2047-8