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Published on: February 10, 2012
Apparent CB1 Receptor Rimonabant Affinity Estimates: Combination with THC and Synthetic Cannabinoids in the Mouse In
T W Grim1, A J Morales2, B F Thomas2
1Department of Pharmacology, Virginia Commonwealth University, Richmond, Virginia (T.W.G., A.J.M., S.S.N., A.H.L.); RTI International, Research Triangle Park, North Carolina (B.F.T., J.L.W.); and PinPoint Testing, LLC, AR (G.W.E.) tgrim@scripps.edu.
Synthetic cannabinoids (SCs) largely exert their effects through cannabinoid 1 receptors (CB1Rs). Quantitative analysis confirmed CB1R mediation of SCs
Area of Science:
- Pharmacology
- Neuroscience
- Medicinal Chemistry
Background:
- Synthetic cannabinoids (SCs) are emerging drugs of abuse with significant health risks.
- Their high affinity for cannabinoid 1 receptors (CB1Rs) and potency contribute to their abuse.
- Understanding receptor mediation is crucial for analyzing SC effects.
Purpose of the Study:
- To quantitatively determine the role of CB1R mediation in the central pharmacological effects of SCs.
- To analyze the affinity of various SCs and Δ9-tetrahydrocannabinol (THC) at CB1Rs.
- To investigate potential non-CB1R targets.
Main Methods:
- Utilized pA2 and pKB analyses for quantitative determination of CB1R mediation.
- Employed the CB1R-selective inverse agonist/antagonist rimonabant.
- Administered five SCs (A-834,735D, WIN55,212-2, CP55,950, JWH-073, CP47,497) and THC to assess cannabimimetic effects.
Main Results:
- pA2 and pKB values were similar across the tested compounds.
- The central pharmacological effects of SCs were largely mediated by CB1Rs.
- No significant evidence for non-CB1R mediation was found for the tested effects.
Conclusions:
- CB1Rs are the primary mediators of the central effects of the studied synthetic cannabinoids.
- Affinity estimation is a valuable tool for assessing potential receptor heterogeneity in SC pharmacology.
- Further research into SC mechanisms is warranted.
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