Objective To study the protective effect and molecular mechanism of glutathione peroxidase 1(GPx-1) high expression on PC12 cell damage mediated by hydrogen peroxide(H2O2).Methods PC12 cells were transfected with plncx plasmid containing human GPx-1 gene and plncx plasmid,and a PC12 cell line was established that could stably express human GPx-1 gene and plncx plasmid through continuous screening.Two means of intervention,H2O2 and sodium selenite + H2O2,were given to PC12,GPx-1-PC12 and plncx-PC12 cells,res...