Abstract
Rationale
The endogenous cannabinoid system plays a vital role in the control of nausea and emesis. Because of the rapid breakdown and hydrolysis of endocannabinoids, such as anandamide, the therapeutic effects may be enhanced by prolonging their duration of action.
Objective
The present experiment evaluated the potential of various doses of URB597, a fatty acid amide hydrolase (FAAH) inhibitor, alone and in combination with systemic administration of anandamide to modulate the establishment of lithium-induced conditioned taste reactivity responses in rats.
Materials and methods
In experiment 1, on the conditioning day, rats first received an injection of 0.3 mg/kg URB597, 0.15 mg/kg URB597, or vehicle and then received a second injection of anandamide (5 mg/kg) or vehicle, before a 3-min exposure of 0.1% saccharin by intraoral infusion. Immediately after the saccharin exposure, the rats were injected with lithium chloride. On each of three test days, rats received a 3-min intraoral infusion of saccharin solution, and the taste reactivity responses were videotaped and monitored. In experiment 2, the effects of pretreatment with the CB1 antagonist, AM-251, on URB597 and anandamide-induced suppressed aversion was evaluated.
Results
Administration of URB597 alone and in combination with anandamide reduced active rejection reactions elicited by a LiCl-paired saccharin solution; both effects were reversed by pretreatment with AM-251, suggesting that they were CB1 receptor mediated.
Conclusions
The results suggest that prolonging the action of anandamide by pretreatment with the FAAH inhibitor, URB597, suppresses lithium-induced nausea in the rat.
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Acknowledgements
This research was supported by the Natural Sciences and Engineering Research Council of Canada (NSERC) operating grants awarded to L.A.P. and K. P.O. and an NSERC postdoctoral fellowship to S.K.C-M. D.P. is funded by grants from the National Institute on Drug Abuse, the University of California Discovery Program, the National Alliance for Research on Schizophrenia and Depression, and Kadmus Pharmaceuticals Inc.
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Cross-Mellor, S.K., Ossenkopp, KP., Piomelli, D. et al. Effects of the FAAH inhibitor, URB597, and anandamide on lithium-induced taste reactivity responses: a measure of nausea in the rat. Psychopharmacology 190, 135–143 (2007). https://doi.org/10.1007/s00213-006-0589-7
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DOI: https://doi.org/10.1007/s00213-006-0589-7