[Objective] To study the in vitro cytotoxicity and oxidative damage of mesoporous nano-SiO2 on RAW264.7 macrophages.[Methods] The RAW 264.7 cells were treated with different concentrations of mesoporous nano-SiO(22.5,10,50,100 μg/mL)and saline control for 24 h.MTT assays were applied for testing macrophage cytotoxicity in vitro,which were based on mitochondrial activity evaluation.Total protein(TP),lactate dehydrogenase(LDH),nitrogen monoxide(NO),glutathion(GSH),superoxide dismutase(SOD)and malondialdehyde(...