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Central mediation and differential blockade by cannabinergics of the discriminative stimulus effects of the cannabinoid CB1 receptor antagonist rimonabant in rats

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Abstract

Rationale

Discovery of an endocannabinoid signaling system launched the development of the blocker rimonabant, a cannabinoid CB1 receptor (CB1R) antagonist/inverse agonist. Due to untoward effects, this medication was withdrawn and efforts have been directed towards discovering chemicals with more benign profiles.

Objective

This study aims to comparatively evaluate new ligands using a rimonabant discriminated drinking aversion procedure.

Methods

Rats discriminated between rimonabant (5.6 mg/kg) and vehicle. The 30 min saccharin (0.1%) drinking after rimonabant pretreatment was followed by injection of lithium chloride (120 mg/kg) in the experimental animals. After vehicle pretreatment, experimental animals were given i.p. NaCl (10 ml/kg). Postdrinking treatment for controls was NaCl, irrespective of pretreatment condition (rimonabant or vehicle).

Results

The centrally acting neutral CB1R antagonist AM4113, but not the limited brain penetrating CB1R neutral antagonist AM6545, substituted for rimonabant. The CB1R agonists THC (1–10 mg/kg), AM1346 (1–10 mg/kg) did not substitute. The rimonabant-induced conditioned suppression of saccharin drinking was attenuated when CB1R agonists AM5983 (0.01–1 mg/kg) and THC (10 mg/kg), but not the CB1R agonist AM1346 (0.1–18 mg/kg), were combined with rimonabant (5.6 mg/kg). By varying the injection-to-test interval, we gauged the relative duration of the cueing effects of rimonabant, and the in vivo functional half-life was estimated to be approximately 1.5 h.

Conclusion

A neutral CB1R antagonist (AM4113) produced cueing effects similar to those of rimonabant and generalization likely was centrally mediated. The functional cueing effects of rimonabant are relatively short-acting, pharmacologically selective, and differentially blocked by cannabinergics.

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Acknowledgments

We thank the National Institute on Drug Abuse (NIDA), Bethesda, MD, USA for supplies of Δ9-THC and rimonabant, and also thanking Roger S. Gifford as well as three anonymous reviewers for their comments on earlier drafts of this manuscript. The studies were supported by NIDA Grants DA 09064, 03801, 9158, 7215, and 00493.

Disclosure Statement

All authors declare that there is no actual or potential conflict of interest related to this manuscript. 'Role of the funding source': Authors declare that the study sponsor did not have any role in study design; in the collection, analysis, and interpretation of data; in the writing of the report; and in the decision to submit the paper for publication.

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Correspondence to Torbjörn U. C. Järbe.

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Järbe, T.U.C., LeMay, B.J., Vemuri, V.K. et al. Central mediation and differential blockade by cannabinergics of the discriminative stimulus effects of the cannabinoid CB1 receptor antagonist rimonabant in rats. Psychopharmacology 216, 355–365 (2011). https://doi.org/10.1007/s00213-011-2226-3

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  • DOI: https://doi.org/10.1007/s00213-011-2226-3

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