Objective To study the effect of hydrogen peroxide on the expression of plk1 gene in PC12 cells cultured in vitro.Methods PC12 cells were incubated with different concentrations of hydrogen peroxide for 6 h,and then the cell viability was measured by MTT method,and the protein expression of polo-like kinase-1(plk1) was detected by Western-blot method.Results Compared with the control group,hydrogen peroxide significantly decreased the cell viability of PC12 cells in the range of experimental dose.The protei...