Aromatic Nitrogen Mustard-Based Prodrugs: Activity, Selectivity, and the Mechanism of DNA Cross-Linking
作者:Wenbing Chen、Yanyan Han、Xiaohua Peng
DOI:10.1002/chem.201400090
日期:2014.6.10
sites but also at the pyrimidine site. For the first time, we isolated and characterized the monomer adducts formed between the canonical nucleosides and the aromatic nitrogen mustard (15) which supported that nitrogen mustards reacted with dG, dA, and dC. The activation mechanism was studied by NMR spectroscopic analysis. An in vitro cytotoxicity assay demonstrated that compound 7 with a carboxyamide
报道了三种新型的H 2 O 2活化的芳香氮芥子气前药(6 – 8)。这些化合物包含通过不同的吸电子接头与H 2 O 2响应触发器连接的DNA烷基化剂,因此它们对DNA无活性,但可以由H 2 O 2触发以释放活性物质。通过在存在或不存在H 2 O 2的条件下测量DNA链间交联(ICL)的形成,研究了这些化合物对DNA的活性和选择性。吸电子连接单元,如季铵盐(6),羧酰胺(7)和碳酸酯基团(8)足以使芳香族氮芥灭活,导致形成的交联少于1.5%。但是,H 2 O 2可以通过将撤离基团转变为供体基团来恢复效应子的活性,因此提高了交联效率(> 20%)。确定了ICL产物的稳定性和反应位点,这表明由7和8诱导的烷基化不仅发生在嘌呤位点,而且发生在嘧啶位点。我们首次分离并鉴定了在规范核苷和芳香氮芥子气之间形成的单体加合物(15),这表明氮芥子与dG,dA和dC反应。通过NMR光谱分析研究了活化机理。体外