质粒介导shRNA对心肌细胞kir2.1蛋白表达和搏动频率的影响  

Effects of shRNA by Plasmid-Mediated RNA Interference on Protein kir2.1 Expression and Beat Frequency in Rat Myocardial Cells

作　　者：李凡东[1] 雷印胜[2] 邹承伟[2] 范全心[2] 

机构地区：[1]济南军区总医院心外科,济南250031 [2]山东省立医院心外科,济南250012

出　　处：《中国胸心血管外科临床杂志》2006年第1期28-31,共4页Chinese Journal of Clinical Thoracic and Cardiovascular Surgery

基　　金：国家自然科学基金资助项目(30471711)

摘　　要：目的构建抑制大鼠心肌细胞k ir2.1基因的真核表达质粒pEGFP 6-k ir2.1,观察对大鼠心肌细胞k ir2.1信使RNA(mRNA)、蛋白表达情况及搏动频率的影响。方法选择5个针对大鼠心肌细胞k ir2.1基因的RNA干扰(RNA in terference)位点,设计合成5对相应的寡核苷酸链,形成双链后依次将其连入带有U 6启动子的载体,得到含5个目的基因的重组质粒pEGFP 6-k ir2.1。转染大鼠心肌细胞,并将其分为3组:实验组、阴性质粒对照组和空白对照组。转染后72h,用逆转录-聚合酶链反应(RT-PCR)和蛋白印迹法(W estern-b lotting)检测k ir2.1mRNA和蛋白表达情况,并观察细胞搏动频率。结果转染后72h,实验组心肌细胞k ir2.1 mRNA和蛋白表达明显低于两对照组(P<0.01),两对照组间比较差别无统计学意义;实验组搏动频率增加,并显著高于两对照组(P<0.01),两对照组之间搏动频率差别无统计学意义。结论真核表达质粒pEGFP 6-k ir2.1能明显抑制大鼠k ir2.1基因的表达,提高大鼠心肌细胞的自律性。Objective To construct the expression short hairpin RNA （shRNA） targeting gene kir2. 1 in rat myocardial cells, named pEGFP6 kir2. 1, and to observe the effects on the expression of messenger RNA（mRNA） and protein of gene kir2. 1 as well as the changes of myocardial beating rates. Methods Five RNA interference （RNAi） sites targeting the rat kir2. 1 gene was selected, designed and synthesized five pairs of oligonucleotides fragments ,annealed them to double-strand, then cloned them into the vectors containing U6 promoter,obtained the vector expressing five aim genes. Rat myocardial cells were divided into three groups： Experimental group, negative plasmid control group and normal control group. Reverse transcription-polymerase chain reaction（RT PCR） and Western-blot were carried out to detect the expression of the mRNA and protein of gene kir2.1 and the beating rates of myocardial cells were observed after 72 h. Results The expression of mRNA and protein of gene kir2. 1 of experimental group were markedly lower than that of other two control groups after 72 h（P〈0.01）. There was no statistically significant between two control groups. The beating rate in experimental group was much faster than other two control groups （P〈0.01）, remained unchanged in both negative plasmid control group and normal control group. Conclusion Plasmid pEGFP6-kir2.1 could suppress the expression of the mRNA and protein of kir2.1 and increase the rat cardiac muscle cell beats.

关 键 词：RNA干扰 KIR2.1 质粒 生物起搏器 

分 类 号：R541[医药卫生—心血管疾病]