Life Science Division, AU-KBC Research Centre, MIT Campus of Anna University, Chromepet, Chennai, 600044, India.
Eur J Nutr. 2015 Mar;54(2):223-34. doi: 10.1007/s00394-014-0703-2. Epub 2014 Apr 23.
The deficiency of glutathione (GSH) has been linked to several diseases. The study investigated the role of GSH as a protective factor against hyperglycemia-mediated injury in VL-17A cells treated with 50 mM glucose.
The cell viability and different oxidative stress parameters including glyoxalase I activity were measured.
GSH supplementation with 2 mM N-acetyl cysteine (NAC) or 0.1 mM ursodeoxycholic acid (UDCA) increased the viability, GSH level and the GSH-dependent glyoxalase I activity in 50 mM glucose-treated VL-17A cells. Further, pretreatment of 50 mM glucose-treated VL-17A cells with NAC or UDCA decreased oxidative stress (levels of reactive oxygen species and protein carbonylation), apoptosis (caspase 3 activity and annexin V-propidium iodide positive cells) and glutathionylated protein formation, a measure of oxidative stress. GSH depletion with 0.4 mM buthionine sulfoximine (BSO) or 1 mM diethyl maleate (DEM) potentiated the decrease in viability, glyoxalase I activity and increase in oxidative stress and apoptosis, with decreased GSH levels in 50 mM glucose-treated VL-17A cells.
Thus, changes in GSH levels with exogenous agents such as NAC, UDCA, BSO or DEM modulate hyperglycemia-mediated injury in a cell model of VL-17A liver cells.
谷胱甘肽(GSH)的缺乏与多种疾病有关。本研究探讨了 GSH 作为一种保护因子,防止高血糖介导的 VL-17A 细胞损伤的作用,这些细胞用 50mM 葡萄糖处理。
测量细胞活力和不同的氧化应激参数,包括糖氧还蛋白 I 活性。
用 2mM N-乙酰半胱氨酸(NAC)或 0.1mM 熊去氧胆酸(UDCA)补充 GSH,增加了 50mM 葡萄糖处理的 VL-17A 细胞的活力、GSH 水平和 GSH 依赖性糖氧还蛋白 I 活性。此外,用 NAC 或 UDCA 预处理 50mM 葡萄糖处理的 VL-17A 细胞,降低了氧化应激(活性氧和蛋白质羰基化水平)、细胞凋亡(半胱天冬酶 3 活性和 Annexin V-碘化丙啶阳性细胞)和谷胱甘肽化蛋白形成,这是氧化应激的一个衡量标准。用 0.4mM 丁硫氨酸亚砜(BSO)或 1mM 二乙基马来酸(DEM)耗尽 GSH,增强了活力、糖氧还蛋白 I 活性的降低,以及氧化应激和细胞凋亡的增加,同时降低了 50mM 葡萄糖处理的 VL-17A 细胞中的 GSH 水平。
因此,用 NAC、UDCA、BSO 或 DEM 等外源性物质改变 GSH 水平,可以调节 VL-17A 肝细胞模型中的高血糖介导的损伤。