Cannabinoid receptor ligands: clinical and neuropharmacological considerations, relevant to future drug discovery and development

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Abstract
This review highlights some important advances that have taken place in cannabinoid research over the last four years. It focuses on novel ligands that are of interest either as experimental tools or as lead compounds for therapeutic agents and possible clinical applications for some of these ligands. The molecular targets for these compounds are various components of the system of endogenous cannabinoids (endocannabinoids) and receptors that together constitute the 'endocannabinoid system'. These are CB1 cannabinoid receptors that are present mainly on central and peripheral neurones, CB2 cannabinoid receptors that are expressed predominantly by immune cells, the biochemical mechanisms responsible for the tissue uptake or metabolism of endocannabinoids and vanilloid receptors. Other cannabinoid receptor types may also exist. Recently developed ligands include potent and selective agonists for CB1 and CB2 receptors, a potent CB2-selective antagonist/inverse agonist and inhibitors of endocannabinoid uptake...