Mauzeroll Janine, Bard Allen J, Owhadian Omeed, Monks Terrence J
Department of Chemistry and Biochemistry, University of Texas, 1 University Station, A5300, Austin, TX 78712, USA.
Proc Natl Acad Sci U S A. 2004 Dec 21;101(51):17582-7. doi: 10.1073/pnas.0407613101. Epub 2004 Dec 15.
The cytotoxicity of menadione on hepatocytes was studied by using the substrate generation/tip collection mode of scanning electrochemical microscopy by exposing the cells to menadione and detecting the menadione-S-glutathione conjugate (thiodione) that is formed during the cellular detoxication process and is exported from the cell by an ATP-dependent pump. This efflux was electrochemically detected and allowed scanning electrochemical microscopy monitoring and imaging of single cells and groups of highly confluent live cells. Based on a constant flux model, approximately 6 x 10(6) molecules of thiodione per cell per second are exported from monolayer cultures of Hep G2 cells.
通过扫描电化学显微镜的底物生成/尖端收集模式,研究了甲萘醌对肝细胞的细胞毒性。将细胞暴露于甲萘醌中,检测细胞解毒过程中形成并通过ATP依赖性泵从细胞中输出的甲萘醌-S-谷胱甘肽共轭物(硫代二酮)。通过电化学检测这种外排,实现了对单个细胞和高度汇合的活细胞群体的扫描电化学显微镜监测和成像。基于恒定通量模型,每秒每个Hep G2细胞单层培养物中约有6×10⁶个硫代二酮分子被输出。