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  • ∆9-tetrahydrocannabinol (THC), 3 H-Naltrindole binding, Cannabinoid receptor 1 (CB1), H-DAMGO binding, Rat cerebral cortex, Rimonabant
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Cannabidiol is an allosteric modulator at mu- and delta-opioid receptors

The mechanism of action of cannabidiol, one of the major constituents of cannabis, is not well understood but a noncompetitive interaction with mu opioid receptors has been suggested on the basis of saturation binding experiments. The aim of the present study was to examine whether cannabidiol is an allosteric modulator at this receptor, using kinetic binding studies, which are particularly sensitive for the measurement of allosteric interactions at G protein-coupled receptors. In addition, we studied whether such a mechanism also extends to the delta opioid receptor. For comparison, (-)-Δ9 -tetrahydrocannabinol (THC; another major constituent of cannabis) and rimonabant (a cannabinoid CB1 receptor antagonist) were...
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Enhanced discriminative stimulus effects of 9-THC in the presence of cannabidiol and 8-OH-DPAT in rhesus monkeys

Background: Cannabidiol, a therapeutic with potential serotonin (5-hydroxytryptamine; 5-HT) 5- HT1A receptor agonist activity, is the second most prevalent cannabinoid in Cannabis after  9 - THC. The extent to which cannabidiol modifies the effects of  9 -THC has not been firmly established, especially with respect to abuse-related effects in rhesus monkeys where previously antagonistic interactions have been reported for some behavioral outcomes. Methods: Cannabidiol and the 5-HT1A receptor agonist (±)-8-hydroxy-2-(dipropylamino)tetralin hydrobromide (8-OHDPAT) were tested in two separate discrimination assays in rhesus monkeys. One group (n=6) discriminated  9 -tetrahydrocannabinol ( 9 -THC; 0.1 mg/kg i.v.); a second group (n=6) discriminated the cannabinoid...
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The Endocannabinoid System A New Target for the Regulation of Energy Balance and Metabolism

Recent studies have provided evidence that the endocannabinoid (EC) system has very significant effects on energy balance and metabolism through the central control of appetite and by affecting peripheral metabolism. Endocannabinoids are endogenous phospholipid derivatives which bind and activate cannabinoid receptors type 1 and type 2 (CB1 and CB2 receptors). The CB1 receptor, a G-protein coupled receptor, is believed to be responsible for the majority of the central effects of endocannaboids on appetite. Chronic positive energy balance and obesity have been associated with an overactivation of the endocannaboid system which has been suggested to contribute to the development of abdominal obesity and to associated...
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