AIM: To examined the effects of hypoxic preconditioning( HPC) on oxygen-glucose deprivation( OGD)-induced PC12 cells,and to investigate its possible mechanisms of autophagy. METHODS: Cultured PC12 cells were randomly divided into control group,HPC group,3-methyladenine( 3-MA) group,HPC + OGD group,3-MA + HPC+ OGD group and OGD group. CCK-8 assay was used to detect the cell viability. The caspase-3 activity was also tested.TUNEL staining and flow cytometry were used to detect the cell apoptosis. The protein ...