Broadly Applicable Strategy for the Fluorescence Based Detection and Differentiation of Glutathione and Cysteine/Homocysteine: Demonstration in Vitro and in Vivo
作者:Wenqiang Chen、Hongchen Luo、Xingjiang Liu、James W. Foley、Xiangzhi Song
DOI:10.1021/acs.analchem.5b04333
日期:2016.4.5
characteristic intense emission band (B1). In the special case of Cys/Hcy, the NBD-S-Cys/Hcy cleavage product can undergo a further, rapid, intramolecular Smiles rearrangement to form a new, highly fluorescent NBD-N-Cys/Hcy compound (band B2); because of geometrical constraints, the GSH derived NBD-S-GSH derivative cannot undergo a Smiles rearrangement. Thus, the presence of a single B1 or double B1 + B2
谷胱甘肽(GSH),半胱氨酸(Cys)和高半胱氨酸(Hcy)是存在于健康哺乳动物的所有细胞和细胞外液中的小生物分子硫醇。众所周知,每种物质在人类生理学中都起着至关重要的作用,并且每种物质的异常水平都可以预测多种不同的疾病状态。尽管已开发出许多基于荧光的方法来检测含有巯基部分的生物分子,但很少能够区分GSH和Cys / Hcy。在本报告中,我们演示了可用于实现此目标的荧光探针设计的广泛适用方法。我们采用的策略是共轭荧光猝灭7-硝基-2,1,3-苯并恶二唑(NBD)通过巯基不稳定的醚键与选定的荧光团(Dye)结合,得到非荧光的NBD-O-Dye。在存在GSH或Cys / Hcy的情况下,醚键断裂,同时产生非荧光NBD-SR衍生物和具有特征性强发射带(B1)的荧光染料。在Cys / Hcy的特殊情况下,NBD-S-Cys / Hcy裂解产物可进行进一步的分子内Smiles快速重排,形成新的高荧光NBD-N-Cys