Relationship between morphological changes of autophagy and apoptosis in PC12 cells induced by oxygen-glucose deprivation and reoxygenation / 中国病理生理杂志

[ ABSTRACT] AIM:To investigate the relationship between morphological changes of autophagy and apoptosis in the PC12 cells induced by oxygen-glucose deprivation and reoxygenation .METHODS:The PC12 cells were randomly di-vided into normal control group , oxygen-glucose deprivation and reoxygenation group , autophagy inhibitor group and auto-phagy activator group .The cells in oxygen-glucose deprivation and reoxygenation group , autophagy inhibitor group and au-tophagy activator group were exposed to reoxygenation (12 h) after 3 h of oxygen-glucose deprivation, and autophagy inhib-itor 3-methyladenine and autophagy activator rapamycin were added into the cells at the same time .Using transmission elec-tron microscope and monodansylcadaverine fluorescence staining , the morphological changes of autophagosome were ob-served.The apoptosis of the PC12 cells were analyzed by flow cytometry with Annexin V-FITC/PI staining and TUNEL method.RESULTS: Compared with normal control group , the numbers of autophagosomes and the apoptotic rates in-creased in oxygen-glucose deprivation and reoxygenation group (P<0.05).Compared with oxygen-glucose deprivation and reoxygenation group , the numbers of autophagosomes decreased obviously ( P<0.05 ) and the apoptotic rates increased markedly in autophagy inhibitor group (P<0.05).The numbers of autophagosomes increased obviously (P<0.05), the apoptotic rates decreased markedly ( P<0.05 ) , the autophagosomes became bigger in size , and autolysosomes was also found in autophagy activator group .CONCLUSION: Oxygen-glucose deprivation and reoxygenation induce autophagy in PC12 cells, and autophagy inhibits cell apoptosis to play a protective role .

Effects of astragaloside Ⅳ on apoptosis of PC12 cells induced by hypoxia/hypoglycemia and reoxygenation / 中国药理学通报

Aim To investigate the effects of astragalo-side IV on apoptosis of PC12 cells inducedby hypoxia/hypoglycemia and reoxygenation. Metheds PC12 cells were randomly divided into 4 groups: normal control group,hypoxia/hypoglycemia and reoxygenation group, astragaloside Ⅳ group and vehicle group. Hypoxia/hy-poglycemia and reoxygenation group, astragaloside Ⅳgroup and vehiclegroup were exposed to reoxygenation (12 h) after 3 h of oxygen and glucose deprivation, and astragaloside Ⅳ was added into cells at the same time. Inverted microscope was used to observe the morphological changes ofPC12 cells and MTT method to detect the activities of PC12 cells, and Annexin V-FITC/PI assay and TUNEL staining were used to meas-ure the apoptosis of PC12 cells. Results Compared with normal control group, cells became round or swol-len and its cellula processes were retracted or disap-peared in hypoxia/hypoglycemia and reoxygenation group;a large number of apoptotic cells could also be observed,whose nucleus were shrinkaged, fragmented or deep-stained. The activities of hypoxia/hypoglycemia and reoxygenation group were decreased markedly than those in normalcontrol group(P0. 05 ) . Conclusion Astragaloside IV can reduce the damage of PC12 cells induced by hypoxia/hypoglycemia and reoxygenation, increase cell activity and inhibit cell apoptosis.