蜕皮甾酮对内皮细胞凋亡保护作用的研究

目的　初步探讨缺氧对培养人脐静脉内皮细胞 (HU VECs)凋亡的影响及蜕皮甾酮的干预性作用。方法　①人脐静脉内皮细胞的培养及鉴定 ;②建立人脐静脉内皮细胞缺氧模型 ,TUNEL法观测不同的缺氧时间 ( 0、12、2 4、4 8h)及蜕皮甾酮对内皮细胞凋亡的影响 ;③内皮细胞在常氧与缺氧状态下 ,实验组分别给于蜕皮甾酮 ( 10 0mg·L-1)刺激 ,2 4h后检测细胞中血管内皮生长因子 (VEGF)的表达。结果　随缺氧时间延长 ,HUVECs凋亡率显著升高 ;蜕皮甾酮能抑制缺氧导致的内皮细胞凋亡 ;蜕皮甾酮刺激内皮细胞VEGF表达上调。结论　缺氧作为一种致病因素 ,对内皮细胞凋亡的促发作用是随缺氧时间的延长而加重的。内皮细胞的过度凋亡是引起内皮功能障碍的一个重要因素 ,蜕皮甾酮通过抑制内皮细胞凋亡而具有内皮细胞保护作用 ,而此作用是由蜕皮甾酮刺激内皮细胞VEGF表达上调所介导的。

Effect of ecdysterone on apoptosis induced by hypoxia in HUVECs

AIM To explore the effect of hypoxia on apoptosis in human umbilical vein endothelial cells(HUVECs) and the role of ecdysterone(EDS)in inhibition of apoptosis. METHODS ① Culture and identification of HUVECs;② Hypoxic model(0,12,24,48 h) in HUVECs was established. While HUVECs was incubated 24 h with EDS(100 mg·L -1 ) under hypoxic condition. Apoptosis in HUVECs was detected by TUNEL;③ HUVECs received EDS 100 mg·L -1 in normal and hypoxic condition. After 24 h, vascular endothelial growth factor (VEGF) was detected with immunohistochemical technique. RESULTS The apoptosis percentages are different under different hypoxic condition. The longer hypotic the time was, the higher the apoptosis percentage was. EDS reduced apoptosis of HUVECs. EDS could enhance expression of VEGF protein in cardiac myocytes of rat in normal and hypoxic condition. CONCLUSION The role of hypoxia in HUVECs apoptosis is more significant along with prolonging of hypoxic time. VEGF play an important role in protective effect of EDS on endothelial cell apoptosis.