Objective:To establish a model of oxidative stress(OS)injury in mouse Leydig cells using α-α'-azodiisobutyramidine hydrochloride(AAPH)and evaluate the physiological function. Methods:In Experiment 1,we treated mouse TM3 Leydig cells with AAPH at 0,1,5,10,50 and 100 mmol/L for 4,8 and 24 h respectively and measured the activity of the cells using MTS,their aging by β-galactoside staining,mitochondrial membrane potential by JC-1 fluorescence and mitochondrial DNA copy number by qPCR.In Experiment 2,we treated the TM3 cells selected in Experime...