【摘要】 本文探讨了碲化镉量子点(CdTe QDs)对肝细胞的毒性效应及其影响因素,为探索量子点的肝毒性机制提供一定依据。采用人肝癌细胞(Hep G2)和人正常肝细胞(L02)为细胞模型,设置0、25、50和100μmol·L-14个浓度组,采用CCK-8法检测细胞生存率,石墨炉法检测细胞内镉元素含量,采用流式细胞术,装载荧光探针DCFH-DA检测细胞内活性氧水平,采用FITC/PI检测细胞凋亡以及JC-1检测细胞ATP水平。研究结果显示:CdTe QDs诱导2种肝细胞生存率降低,细胞凋亡率升高,细胞对QDs的摄入水平具有时间依赖性,细胞内活性氧水平显著升高,线粒体膜电位降低和ATP含量显著减少,且2种肝细胞比较发现L02细胞损伤程度更为严重。CdTe QDs对2种肝细胞造成损伤,对L02细胞损伤更明显,其原因是L02细胞对CdTe QDs摄取更多,导致进入细胞的QDs引发更为严重的损伤效应。更多还原

【Abstract】 The aim of this paper was to investigate the hepatotoxicity of cadmium telluride quantum dots(Cd Te QDs) and its influencing factors, and provide some basis for exploring the mechanism of liver toxicity of QDs. Thehuman hepatocellular carcinoma(Hep G2) and human normal hepatocytes(L02) were considered as the cell models.The cell viability was measured by CCK-8 method after cells were treated with Cd Te QDs at 0, 25, 50 and 100μmol·L-1. The content of cadmium in the cells was measured by graphite furnace method. The intracellular reactive oxygen species(ROS) were measured by DCFH-DA assay. The level of ATP was detected through JC-1 method. Apoptosis was detected by Annexin V-FITC/PI-FCM assay. The CCK-8 results showed that Cd Te QDs inhibited the proliferation of Hep G2 and L02 cells in a concentration-and time-dependent manner. Meanwhile, the apoptosis rate was obviously increased compared with the control(P<0.05). The uptakes of Cd Te QDs by both hepatocytes were also in a time-dependent manner. The levels of intracellular reactive oxygen species were significantly increased. The mitochondrial membrane potential and ATP content in QDs-treated cells decreased significantly compared to the control, which suggested the mitochondrial damage. Taking into account all the findings, it was concluded that the L02 cells were damaged more seriously by Cd Te QDs. Cd Te QDs caused damage to both liver cells, and more importantly, the L02 cell damage induced by Cd Te QDs is more serious than that of Hep G2 cells,possibly because L02 cells prefer to intake more QDs, resulting in more serious detrimental effect.更多还原