Synthesis and Mode of Action of <sup>125</sup>I- and <sup>3</sup>H-Labeled Thieno[2,3-<i>c</i>]pyridine Antagonists of Cell Adhesion Molecule Expression
                                
                                    
                                        作者:Gui-Dong Zhu、Verlyn Schaefer、Steven A. Boyd、Gregory F. Okasinski                                    
                                    
                                        DOI:10.1021/jo016171j
                                    
                                    
                                        日期:2002.2.1
                                    
                                    A series of thieno[2,3-c]pyridine antagonists of cell adhesion molecule (CAM) expression, such as A-205804 (1) and A-249377 (2), selectively suppressed the induced expression of E-selectin and ICAM-1 over VCAM-1. In an effort to explore the biological mechanism of action of these inhibitors, we synthesized I-125- and H-3-labeled thieno[2,3-c]pyridines 5 and 6. An isolated diazonium tetrafluoroborate salt efficiently trapped (NaI)-I-125 on very small scale (7.5 mug of (NaI)-I-125), providing the corresponding I-125-labeled thieno[2,3-c]pyridine in modest yield. Preliminary mechanistic investigations using these radiolabeled compounds revealed that, upon incubation with human umbilical vein endothelial cells (HUVECs), these inhibitors of CAM expression translocated to the cell nucleus and were noncovalently associated with macromolecules of molecular weight greater than 650 kDa.