Journal
EUROPEAN JOURNAL OF PHARMACEUTICAL SCIENCES
Volume 23, Issue 3, Pages 233-243Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ejps.2004.07.013
Keywords
cannabinoid CB1 and CB2 receptors; [S-35]-GTP gamma S; tetrahydrocannabinol; bicyclic cannabinoids; aminoalkylindoles; inverse agonism
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Affinities and efficacies of several reference cannabinoid ligands were investigated at central and peripheral cannabinoid receptors in three different species (rat, mouse, and human). The tested compounds belong to different chemical classes such as classical and non-ciassical terpene derivatives (Delta(8)-THC, Delta(9)-THC, HU 210, CP 55,940, CP 55,244, CP 55,243 and CP 47,947), aminoalkylindole (WIN 55,212-2, WIN 55,212-3) and diarylpyrazole cannabinoids (SR 141716A, SR 144528). As cannabinoid receptors have been shown to be mainly coupled to Gi/o type G- proteins, and by using the [S-35]-GTPgammaS nucleotide binding modulation, we characterized the functional activity of these ligands which can act as agonists (positive intrinsic activity), partial agonists (partial positive intrinsic activity), antagonists (no intrinsic activity), or inverse agonists (negative intrinsic activity). To our knowledge, some derivatives (Delta(8)-THC, WIN 55,212-3, CP 55,243 and CP 47,947) have never been characterized in [S-35]-GTPgammaS binding assays and up to now, this study represents the largest survey of reference cannabinoids performed in unique experimental conditions and in the same laboratory. (C) 2004 Elsevier B.V. All rights reserved.
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