Synthesis of sialic acid derivatives as ligands for the myelin-associated glycoprotein (MAG)
                                
                                    
                                        作者:Sachin V. Shelke、Gan-Pan Gao、Stefanie Mesch、Heiko Gäthje、Soerge Kelm、Oliver Schwardt、Beat Ernst                                    
                                    
                                        DOI:10.1016/j.bmc.2007.04.038
                                    
                                    
                                        日期:2007.7
                                    
                                    The trisaccharide substructure 13 of the ganglioside GQ1b alpha shows a remarkable affinity for the myelin-associated glycoprotein (MAG). In the search for structurally simplified and pharmacokinetically improved mimics of 13, sialosides with modifications at the reducing and non-reducing end were synthesized. The biological evaluation of mimics 12a-o was performed in a competitive target-based assay. It was found that the relative inhibitory potency (rIP) of antagonist 12h was enhanced by more than 1000-fold in comparison to the reference trisaccharide 13, despite the former having a much simpler structure. In addition, the sialic acid derivatives, for example, 12h, have clearly improved pharmacokinetic properties due to the presence of aromatic moieties, a lower molecular weight, and a reduced number of polar hydroxy functions compared to the reference compound 13. (c) 2007 Elsevier Ltd. All rights reserved.