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lüll The endocannabinoid system and pain Guindon J; Hohmann AGCNS Neurol Disord Drug Targets 2009[Dec]; 8 (6): 403-21The therapeutic potential of cannabinoids has been the topic of extensive investigation following the discovery of cannabinoid receptors and their endogenous ligands. Cannabinoid receptors and their endogenous ligands are present at supraspinal, spinal and peripheral levels. Cannabinoids suppress behavioral responses to noxious stimulation and suppress nociceptive processing through activation of cannabinoid CB(1) and CB(2) receptor subtypes. Endocannabinoids, the brain's own cannabis-like substances, share the same molecular target as Delta(9)-tetrahydrocannabinol, the main psychoactive component in cannabis. Endocannabinoids serve as synaptic circuit breakers and regulate multiple physiological and pathological conditions, e.g. regulation of food intake, immunomodulation, inflammation, analgesia, cancer, addictive behavior, epilepsy and others. This review will focus on uncovering the roles of anandamide and 2-arachidonoylglycerol, the two best characterized endocannabinoids identified to date, in controlling nociceptive responding. The roles of anandamide and 2-arachidonoylglycerol, released under physiological conditions, in modulating nociceptive responding at different levels of the neuraxis will be emphasized in this review. Effects of modulation of endocannabinoid levels through inhibition of endocannabinoid hydrolysis and uptake is also compared with effects of exogenous administration of synthetic endocannabinoids in acute, inflammatory and neuropathic pain models. Finally, the therapeutic potential of the endocannabinoid signaling system is discussed in the context of identifying novel pharmacotherapies for the treatment of pain.|*Endocannabinoids[MESH]|Animals[MESH]|Arachidonic Acids/metabolism[MESH]|Brain/drug effects/metabolism[MESH]|Cannabinoid Receptor Modulators/metabolism/pharmacology/*therapeutic use[MESH]|Glycerides/metabolism[MESH]|Humans[MESH]|Pain/*drug therapy/metabolism/pathology[MESH]|Polyunsaturated Alkamides/metabolism[MESH]|Receptors, Cannabinoid/classification/*metabolism[MESH] |