去甲肾上腺素减轻脂多糖所致内皮细胞损伤

目的:探讨去甲肾上腺素(norepinephrine,NE)减轻脂多糖(lipopolysaccharides,LPS)对内皮细胞损伤的作用。方法:用100 mg/L LPS诱导人脐静脉血管内皮细胞HUVEC-12损伤,用不同浓度NE处理后,使用realtime PCR及Western blot法检测各组内皮细胞血管内皮型钙黏素(VE-cadherin)表达的变化,ELISA法测定细胞培养上清液中TNF-α、IL-1β、IL-2和IL-10的浓度,活性氧簇(reactive oxygen species,ROS)检测试剂盒检测细胞内的ROS水平。结果:LPS可显著抑制内皮细胞中VE-cadherin m RNA和蛋白的表达水平,同时伴有TNF-α、IL-1β和IL-2升高及IL-10下降,ROS含量明显增加;不同浓度的NE呈剂量依赖性地上调VE-cadherin的m RNA和蛋白表达,减轻细胞内的氧化应激水平,并部分逆转TNF-α、IL-1β、IL-2和IL-10的变化。结论:不同浓度NE能明显逆转LPS造成的内皮细胞损伤,其机制可能与上调VE-cadherin、减轻细胞的氧化应激及炎性介质水平有关。

Norepinephrine attenuates injury of vascular endothelial cells induced by LPS

AIM: To investigate the effects of norepinephrine (NE) on vascular endothelial cell damage induced by lipopolysaccharides (LPS). METHODS: Human umbilical vein endothelial cells (HUVEC-12) were cultured with LPS at 100 mg/L to establish the cell damage model. Real-time PCR and Western blot were used to determine the expressions of VE-cadherin at mRNA and protein levels. The levels of TNF-α, IL-1β, IL-2 and IL-10 in culture supernatant were measured by ELISA. The reactive oxygen species (ROS) production in the endothelial cells was detected by ROS assay kit. RESULTS: LPS decreased both mRNA and protein levels of VE-cadherin accompanied by increased levels of TNF-α, IL-1β, IL-2 and intracellular ROS, and decreased level of IL-10 in the endothelial cells. NE reversed the expression of VE-cadherin at mRNA and protein levels under the condition of LPS treatment in a dose-dependent manner, and also alleviated the intracellular oxidative stress. CONCLUSION: NE reverses the endothelial damage induced by LPS, which may be related to the up-regulation of VE-cadherin level and the decreases in oxidative stress and inflamatory mediators.