Novel delta opioid receptor agonists exhibit differential stimulation of signaling pathways
作者:Youyi Peng、Qiang Zhang、Sonia Arora、Susan M. Keenan、Sandhya Kortagere、Kenneth M. Wannemacher、Richard D. Howells、William J. Welsh
DOI:10.1016/j.bmc.2009.07.007
日期:2009.9.1
A novel family of 1,3,5-trisubstituted 1,2,4-triazoles was discovered as potent and selective ligands for the delta opioid receptor by rational design. Compound 5b exhibited low-nanomolar in vitro binding affinity (IC50 = 5.8 nM), excellent selectivity for the d opioid receptor over the alternative mu and kappa opioid receptors, full agonist efficacy in receptor down-regulation and MAP kinase activation assays, and low-efficacy partial agonist activity in stimulation of GTP gamma S binding. The apparent discrepancy observed in these functional assays may stem from different signaling pathways involved in each case, as found previously for other G-protein coupled receptors. More biological studies are underway to better understand the differential stimulation of signaling pathways by these novel compounds. (C) 2009 Elsevier Ltd. All rights reserved.