Oxidation versus Addition Reactions of Glutathione during the Interactions with Quinoid Thioethers of 4-(Dimethylamino)phenol
作者:Eva Ludwig、Peter Eyer
DOI:10.1021/tx00044a016
日期:1995.3
glutathione (GSH), formation of 4-(dimethylamino)-2-(glutathion-S-yl)phenol (2-GS-DMAP), 4-(dimethylamino)-2,6-bis(glutathion-S-yl)phenol (2,6-bis-GS-DMAP), and 4-(dimethylamino)-2,3,6-tris(glutathion-S-yl)phenol (2,3,6-tris-GS-DMAP) was observed. While the trisubstituted glutathione conjugate is a stable end product, 2-GS-DMAP and 2,6-bis-GS-DMAP were still reactive and produced ferrihemoglobin. It is concluded
4-(二甲基氨基)苯酚(DMAP)是有效的氰化物解毒剂,可在体内和体外形成许多等价的亚铁血红蛋白。在该过程中,观察到苯氧基自由基的形成,其被铁血红蛋白还原,从而维持了铁血红蛋白形成的催化循环,或者歧化成DMAP的醌亚胺。在巯基,例如谷胱甘肽(GSH)存在下,形成4-(二甲基氨基)-2-(谷胱甘肽-S-基)苯酚(2-GS-DMAP),4-(二甲基氨基)-2,6-bis (谷胱甘肽-S-基)苯酚(2,6-双-GS-DMAP)和4-(二甲基氨基)-2,3,6-三(谷胱甘肽-S-基)苯酚(2,3,6-三-GS-DMAP)。尽管三取代的谷胱甘肽共轭物是稳定的最终产物,但2-GS-DMAP和2,6-bis-GS-DMAP仍具有反应性并产生亚铁血红蛋白。结论是多取代的DMAP硫醚的形成是与醌型中间体顺序进行氧化/加成反应的结果。在氧化的DMAP或2-GS-DMAP与谷胱甘肽相互作用的过程中,谷胱甘肽二硫