Cannabinoids exert their well known physiological effects through two G protein coupled receptors, cannabinoid receptor 1 (CB1) and CB2. Both cannabinoid receptors have been shown to inhibit adenylyl cyclase as well as stimulate the mitogen-activated protein kinase, MAPK. CB1 receptors also modulate ion channels through direct G-protein interactions. Delta 9-tetrahydrocannibinol and related ligands likely exert their psychoactive effects by inhibiting presynaptic N- and P/Q type calcium channels. CB2 is thought to function primarily in the immune system although it has been suggested to be present in the central nervous system, including the retina.
Cannabinoid receptor 2; cannabinoid receptor 2 (macrophage); CB-2; CB2R; CNR3; CX5; HCB2; HGNC:2160; OTTHUMP00000044841; RP11-4M23.1; testis-dominant CNR2 isoform CB2