NDLI: JWH-018 and JWH-073: Δ9-Tetrahydrocannabinol-Like Discriminative Stimulus Effects in Monkeys

Content Provider	PubMed Central
Author	Ginsburg, Brett C. Schulze, David R. Hruba, Lenka Mcmahon, Lance R.
Copyright Year	2012
Abstract	Products containing naphthalen-1-yl-(1-pentylindol-3-yl) methanone (JWH-018) and naphthalen-1-yl-(1-butylindol-3-yl) methanone (JWH-073) are emerging drugs of abuse. Here, the behavioral effects of JWH-018 and JWH-073 were examined in one behavioral assay selective for cannabinoid agonism, rhesus monkeys (n = 4) discriminating Δ9-tetrahydrocannabinol (Δ9-THC; 0.1 mg/kg i.v.), and another assay sensitive to cannabinoid withdrawal, i.e., monkeys (n = 3) discriminating the cannabinoid antagonist rimonabant (1 mg/kg i.v.) during chronic Δ9-THC (1 mg/kg s.c. 12 h) treatment. Δ9-THC, JWH-018, and JWH-073 increased drug-lever responding in monkeys discriminating Δ9-THC; the ED50 values were 0.044, 0.013, and 0.058 mg/kg, respectively and the duration of action was 4, 2, and 1 h, respectively. Rimonabant (0.32–3.2 mg/kg) produced surmountable antagonism of Δ9-THC, JWH-018, and JWH-073. Schild analyses and single-dose apparent affinity estimates yielded apparent pA 2/pK B values of 6.65, 6.68, and 6.79 in the presence of Δ9-THC, JWH-018, and JWH-073, respectively. In Δ9-THC-treated monkeys discriminating rimonabant, the training drug increased responding on the rimonabant lever; the ED50 value of rimonabant was 0.20 mg/kg. Δ9-THC (1–10 mg/kg), JWH-018 (0.32–3.2 mg/kg), and JWH-073 (3.2–32 mg/kg) dose-dependently attenuated the rimonabant-discriminative stimulus (i.e., withdrawal). These results suggest that Δ9-THC, JWH-018, and JWH-073 act through the same receptors to produce Δ9-THC-like subjective effects and attenuate Δ9-THC withdrawal. The relatively short duration of action of JWH-018 and JWH-073 might lead to more frequent use, which could strengthen habitual use by increasing the frequency of stimulus-outcome pairings. This coupled with the possible greater efficacy of JWH-018 at cannabinoid 1 receptors could be associated with greater dependence liability than Δ9-THC.
Related Links	http://dx.doi.org/10.1124/jpet.111.187757
Starting Page	37
File Format	PDF
ISSN	15210103
e-ISSN	15210103
Journal	The Journal of Pharmacology and Experimental Therapeutics
Issue Number	1
Volume Number	340
Language	English
Publisher	The American Society for Pharmacology and Experimental Therapeutics
Publisher Date	2012-01-01
Access Restriction	Open
Rights Holder	The American Society for Pharmacology and Experimental Therapeutics
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Molecular Medicine Pharmacology

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