Objective To observe the genetoxic effect of SiO2-nanoparticles with different concentrations and diameters on human vascular endothelial cells(HUVEC),and to explore its possible action mechanism. Methods HUVEC were respectively treated with SiO2-nanoparticles of different concentrations(0,10,25,50 μg/mL)and diameters(10,25,50,100,500 nm).The micronuclear rates,GSH levels and GSSG levels were detected in HUVEC.The effect of Tween-80 on the toxicity of SiO2-nanoparticles in the HUVEC was observed. Results SiO2-nanoparticles could increase...