双启动子shRNA表达载体对hTERT和bcl-2基因表达的抑制作用

目的:研究双启动子shRNA表达载体对人端粒酶蛋白催化亚单位(hTERT)和B细胞淋巴瘤/白血病-2(bcl-2)基因表达的抑制作用。方法:分别从构建好的大肠杆菌DH5α菌体中提取含有双启动子shRNA的表达载体pdPRO-TB、单启动子对照pdPRO-T、pdPRO-B和阴性对照质粒pdPRO,通过脂质体介导瞬时转染Hela细胞,倒置显微镜下观察细胞形态。实时荧光定量RCR检测hTERT和bcl-2基因的表达水平。结果:4种菌体中均提取出5 000 bp左右的质粒,分别转染Hela细胞48 h后,可见转染pdPRO的Hela细胞形态无明显变化,转染pdPRO-T和pdPRO-B的Hela细胞有部分悬浮,转染pdPRO-TB的Hela细胞有大量悬浮。各载体质粒构建均成功,各目的基因相对管家基因的含量:T(hTERT)=39.8%,B(hTERT)=107.9%,TB(hTERT)=32.1%;T(bcl-2)=91.4%,B(bcl-2)=35.4%,TB(bcl-2)=31.4%。结论:双启动子shRNA表达载体构建成功,可同时抑制hTERT和bcl-2基因的表达。

Effects of transfecting Bcl-2 shRNA and celecoxb on the SGC-7901 cell line

Objective:The aim of this study was to study the changes of SGC-7901 cells transfecting small hairpin RNA(shRNA) targeted Bcl-2 and celecoxib in vitro.Methods:To use the effective siRNA targeted to Bcl-2 by Lipofectamine 2000,the rate of cell growth inhibition of all groups was detected by multiply-table tournament(MTT) method,apoptosis rate was examined by flow cytometry and the expression of Bcl-2 was assayed by Elisa.Results:After siRNA was transfected to SGC-7901 cells,the rate of cell growth inhibition was increased,the joint group was higher by flow cytometry and the expression of Bcl-2 was lower by Elisa.Conclusion:The growth of SGC-7901 cells which was transfected siRNA has been inhibited,and the sensitivity to celecoxib has been increased.

敲减钙离子/钙调蛋白依赖性激酶Ⅳ抑制干扰素-γ诱导C2C12细胞免疫分子的表达

目的探究敲减钙离子/钙调蛋白依赖性激酶Ⅳ(Ca MKⅣ)基因对炎性培养条件下C2C12细胞免疫分子表达的影响。方法采用慢病毒基因干扰技术敲减C2C12细胞的Ca MKⅣ基因,以2%马血清将C2C12细胞分化成肌管,以干扰素-γ(IFN-γ)刺激C2C12细胞,采用Real-time PCR和Western blotting检测Ca MKⅣ的表达,采用Western blotting和免疫荧光检测免疫分子主要组织相容性复合体(MHC) classⅠ(H-2Kb)、MHC classⅡ(H2-Ea)、Toll样受体3(TLR3)的表达,采用Real-time检测肌细胞分泌型促炎性细胞因子白细胞介素(IL)-1β、IL-6、肿瘤坏死因子(TNF)-α、巨噬细胞炎性蛋白(MIP)-1α和单核细胞趋化因子(MCP)-1的基因表达。结果 IFN-γ可诱导成肌干细胞以及分化肌管表达或上调表达免疫分子MHC-Ⅰ、MHC-Ⅱ、TLR3,同时上调C2C12细胞促炎性细胞因子IL-1β、IL-6、TNF-α、MIP-1α和MCP-1的基因表达量;敲减Ca MKⅣ基因导致上述上调趋势被抑制。结论敲减Ca MKⅣ基因可有效抑制IFN-γ诱导的免疫分子的表达,可能提示Ca MKⅣ参与调节肌细胞的免疫学特性。