miR-221/222在肝癌细胞抵抗内质网应激凋亡中的作用

目的 研究内质网应激对miR-221/222的调控及其在肝癌细胞抵抗内质网应激诱导细胞凋亡中作用.方法 采用miR-221/222抑制物和miR-221/222类似物分别阻断或模拟内源性miR221/222的功能,并利用Western blot和流式细胞技术分析内质网应激条件下miR-221/222对肝癌细胞周期和凋亡的调控作用.结果 内质网应激诱导miR-221/222表达下调,miR-221/222类似物和抑制物分别抑制和促进内质网应激诱导的p27Kip1表达上调,干扰p27Kip1不仅抑制了内质网应激诱导的肝癌细胞G0/G1期阻滞,也促进了内质网应激介导的肝癌细胞凋亡.结论 内质网应激诱导miR-221/222下调能够通过促进p27Kipl表达对内质网应激条件下肝癌细胞周期和凋亡起重要调控作用.

Abstract：

Objective To investigate the role of miR-221/222 in inhibiting endoplasmic reticulum stress-induced human hepatocarcinoma cells apoptosis. Method miR-221/222 mimics and inhibitors were used to mimic or block the function of endogenous miR-221/222 respectively. Western blot and flow cytometry were used to test the effects of miR-221/222 on cell cycle and apoptosis under endoplasmic reticulum stress in human hepatocellular carcinoma cells. Results Endoplasmic reticulum stress resulted in miR-221/222down-regulation in human hepatocellular carcinoma cells. miR-221/222 mimics and inhibitors inhibited and promoted respectively endoplasmic reticulum stress-mediated p27Kip1 induction. Moreover, p27Kip1 suppression not only resulted in reduction in the fraction of G1 phase cells, but also promoted the endoplasmic reticulum stress-mediated apoptosis in human hepatocellular carcinoma cells. Conclusions miR-221/222 were downregulated by endoplasmic reticulum stress in human hepatocellular carcinoma cells, which subsequently protected human hepatocellular carcinoma cells against endoplasmic reticulum stress-induced apoptosis through p27KiP1 regulation.

The role of mir-221/222 in inhibiting endoplasmic reticulum stress-induced human hepatocarcinoma cell apoptosis

Objective To investigate the role of miR-221/222 in inhibiting endoplasmic reticulum stress-induced human hepatocarcinoma cells apoptosis. Method miR-221/222 mimics and inhibitors were used to mimic or block the function of endogenous miR-221/222 respectively. Western blot and flow cytometry were used to test the effects of miR-221/222 on cell cycle and apoptosis under endoplasmic reticulum stress in human hepatocellular carcinoma cells. Results Endoplasmic reticulum stress resulted in miR-221/222down-regulation in human hepatocellular carcinoma cells. miR-221/222 mimics and inhibitors inhibited and promoted respectively endoplasmic reticulum stress-mediated p27Kip1 induction. Moreover, p27Kip1 suppression not only resulted in reduction in the fraction of G1 phase cells, but also promoted the endoplasmic reticulum stress-mediated apoptosis in human hepatocellular carcinoma cells. Conclusions miR-221/222 were downregulated by endoplasmic reticulum stress in human hepatocellular carcinoma cells, which subsequently protected human hepatocellular carcinoma cells against endoplasmic reticulum stress-induced apoptosis through p27KiP1 regulation.