Synthesis and binding studies of epibatidine analogues as ligands for the nicotinic acetylcholine receptors
摘要:
Neuronal nicotinic acetylcholine receptors (nAChRs) are transmembrane ligand-gated ion channels. Recent research demonstrated that selective nAChR ligands may have therapeutic potential in a number of CNS diseases and disorders. The alkaloid epibatidine is a highly potent non-opioid analgesic and nAChR agonist, but too toxic to be a useful ligand. To develop ligands selective for distinct nAChR subtypes and with reduced toxicity, a series of epibatidine and homoepibatidine analogues were synthesized. (+/-)-8-Methyl-3-(pyridin-3-yl)-8-azabicyclo[3,2,1]oct-2-ene, showed high affinity towards alpha 4 beta 2 (K-i = 2 nM), subtype selectivity (alpha 4 beta 2/alpha 7 affinity ratio > 100) and relatively low toxicity in mice and can be labeled with C-11 and F-18 as positron emission tomography (PET) tracers for imaging of nAChRs. (c) 2006 Elsevier SAS. All rights reserved.