Objective To investigate the protective effects of four antioxidants ( N-acetyl cysteine [ NAC ], catalase [ CAT] ,superoxide dismutase[ SOD], and mannitol)on oxidative injury of human macrophages induced by uraniumdust. Methods The cell viability, intracellular reactive oxygen species (ROS)and glutathione (GSH)were determined with methyl thiazolyl tetrazolium (MTT)assay, fluorescence microscopy and chemical/fluorescence emission, respectively. The protective effects of the four antioxidants on uranium dust-induced oxidative injury were...