| pubmed-article:16679816 | pubmed:abstractText | Tramadol is widely used clinically as an analgesic, yet the mechanism by which it produces antinociception remains unclear. O-Desmethyl tramadol, the main metabolite of tramadol, is a more potent analgesic than tramadol. We reported previously that tramadol inhibits the 5-hydroxytryptamine (5-HT) type 2C receptor (5-HT(2C)R), a G-protein-coupled receptor that is expressed widely within brain and that mediates several effects of 5-HT, including nociception, feeding, and locomotion. The effects of O-desmethyl tramadol on 5-HT(2C)R have not been studied. In this study, we investigated the effect of O-desmethyl tramadol on 5-HT(2C)R expressed in Xenopus oocytes. | lld:pubmed |
