Rimonabant Analogues Produced Cannabinoid-Like Mouse Behaviors Without THC-Like Drug Cues
Some experimental rimonabant analogues produced cannabinoid-like effects in mouse tests but did not reproduce THC's learned drug cue. Other comparisons also separated the compounds from THC, cautioning against equating a similar outward profile with the same pharmacology.
Behavioral similarity was only the starting point
O-6629 and O-6658 produced dose-dependent effects resembling parts of a cannabinoid test profile. Neither substituted for nor antagonized THC's discriminative stimulus. Drug discrimination measures learned responses to internal drug cues, rather than directly measuring human euphoria or addiction.
Several comparisons pointed toward distinct mechanisms
O-6658 substituted in mice trained with O-6629, while THC and morphine did not generate O-6629-like responding. Rimonabant did not block the O-6629 cue. Repeated THC also failed to produce cross-tolerance to O-6211 in the tested battery. Different analogues supplied different comparisons and should not be collapsed into one unnamed compound.
Abuse liability remained incompletely characterized
The authors suggested the analogues were unlikely to have marijuana-like abuse liability, but explicitly left general abuse liability undetermined. The mouse findings do not establish human safety or an absence of rewarding effects through other pathways. Their mechanisms were still under investigation.
The study distinguishes observable cannabinoid-like behaviors from THC-like cues and cross-tolerance. It supports careful pharmacological classification, not a blanket claim that these research compounds are safe or nonaddictive. The compound, endpoint and comparison drug must accompany the conclusion.
Related: interpreting cannabis tolerance claims.
Research cited
Walentiny D; Vann R; Mahadevan A; Kottani R; Gujjar R; Wiley J. Novel 3-substituted rimonabant analogues lack Δ(9) -tetrahydrocannabinol-like abuse-related behavioural effects in mice. British journal of pharmacology (2013). doi:10.1111/bph.12099. Findings discussed from the study abstract.
