Abstract
Objective
To examine the discriminative stimulus effects of the cannabinoid CB1 receptor (CB1R) antagonist/inverse agonist rimonabant (SR141716A) using a discriminated taste aversion (DTA) procedure.
Materials and methods
Groups of rats were trained to discriminate between drug (5.6 or 3 mg/kg) and vehicle in DTA (t′ = 20 min). The 30-min drinking opportunity after rimonabant pretreatment was followed by injection of lithium chloride (120 mg/kg) in the experimental (EXP) animals. When offered fluid after vehicle pretreatment, EXP animals subsequently were given intraperitoneal saline (NaCl, 10 ml/kg). Post-drinking treatment for controls (CONT) was NaCl irrespective of the pretreatment condition (rimonabant or vehicle). Tests examined other doses and drugs (t′ = 20 min).
Results
The rimonabant analog AM251 (1 to 5.6 mg/kg) substituted for rimonabant. AM281 also appeared to substitute, but interpretation is complicated by unconditioned effects (drinking suppressed also in the CONT group). The CB2R antagonists SR144528 (18 and 30 mg/kg), AM630 (1 to 10 mg/kg), and the CB1R agonist methanandamide (mAEA, 3 and 10 mg/kg) did not substitute. There was a dose-related attenuation of the rimonabant-induced suppression of saccharin drinking when Δ9-tetrahydrocannabinol (Δ9-THC; 0.3 to 5.6 mg/kg), but not mAEA (1 to 10 mg/kg), was given together with rimonabant (3 mg/kg). Unconditioned effects occurred with the mAEA–rimonabant combination, not evident for combinations of rimonabant and Δ9-THC. mAEA (10 mg/kg) plus AM251 (5.6 mg/kg) resulted in strong unconditioned effects.
Conclusion
Rimonabant induces a discriminative stimulus in DTA that continues to show potential for further examination of cannabinoid receptor antagonism.
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Acknowledgements
We thank NIDA, Bethesda, MD, for supplies of Δ9-THC, rimonabant, and SR142845. We thank Ms. M. Harris for technical assistance and Dr. J. Troisi, Ms. S. Tai, and Mr. B. LeMay as well as three anonymous reviewers for comments on the manuscript. Supported by NIDA Grants DA 09064, 00253, and 13429 (Philadelphia, PA), 03801, 9158, 7215, and 00493 (Storrs, CT and Boston, MA).
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Järbe, T.U.C., Li, C., Vadivel, S.K. et al. Discriminative stimulus effects of the cannabinoid CB1 receptor antagonist rimonabant in rats. Psychopharmacology 198, 467–478 (2008). https://doi.org/10.1007/s00213-008-1076-0
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DOI: https://doi.org/10.1007/s00213-008-1076-0