沉默信息调节因子1促进肝细胞增殖的机制  

Mechanism of SIRT1 promoting the proliferation of hepatocytes

作　　者：刘灏[1] 李川江[2] 王汉宁[3] 刘正军[1] 

机构地区：[1]南方医科大学南方医院1血管外科,广州市510515 [2]南方医科大学南方医院1血管外科肝胆外科,510317 [3]广东省第二人民医院普外科,广州市510317

出　　处：《实用医学杂志》2013年第16期2634-2637,共4页The Journal of Practical Medicine

基　　金：国家自然科学基金面上项目(编号:81172383);广东省自然科学基金资助博士启动项目(编号:S2011040002946)

摘　　要：目的:明确沉默信息调节因子1(SIRT1)对肝癌细胞系HepG2细胞生物学功能的影响。方法:构建pCDNA4-SIRT1质粒,合成SIRT1的siRNA,转染肝癌HepG2细胞系。XTT法及CCK-8法检测细胞的增殖活力、流式细胞仪检测细胞周期及细胞凋亡率、Western blot检测蛋白的表达。结果:干扰SIRT1表达均可明显抑制HepG2细胞增殖(P<0.001);干扰SIRT1表达均可明显抑制HepG2细胞S期(P<0.01),而使G1期明显增加(P<0.001);干扰SIRT1表达可明显促进HepG2细胞凋亡(P<0.001);在HepG2细胞中当抑制SIRT1表达时,PTEN的乙酰化水平、磷酸化AKT和PI3K的表达水平明显增加。结论:SIRT1在肝癌细胞系HepG2增殖中起重要作用,同时存在抑制其凋亡的作用,该作用涉及PTEN/PI3K/AKT信号转导通路。Objective To investigate the effects of SIRT1 on the biological behaviors of liver cancer cell lines HepG2. Methods pCDNA4-SIRT1 plasmid was constructed, and siRNA of SIRT1 was synthesized and transfected into HepG2 cells. The proliferation of HepG2 cells was evaluated by XTr assay and CCK-8 kit; flow cytometry was employed to analyze the distribution of cell cycle and apoptosis rate; and Western blotting was performed to detect the expression of PTEN, PI3K and AKT. Results Down-regulation of SIRT1 could significantly suppress the proliferation of HepG2 cells （P 〈 0.001 ）, could decrease the percentage of HepG2 cells in S and G2/M phase （P 〈 0.01 ） while increase the percentage of HepG2 cells in G0/G1 phase （P 〈 0.001）, could inhibit the apoptosis of HepG2 cells （P 〈 0.001 ）, and could up-regulate the expressions of PTEN, PI3K and AKT. Conclusion SIRT1 played a significant role in the proliferation and apoptosis of HepG2 cells, which was correlated with PTEN/PI3K/AKT signaling pathway.

关 键 词：SIRT1 HEPG2 肝细胞癌 增殖 

分 类 号：R735.7[医药卫生—肿瘤]