靶向siRNA体外抑制大鼠肾间质成纤维细胞MAS基因表达的研究
发布时间:2018-01-20 01:45
本文关键词: 小分子干扰RNA 基因沉默 MAS 出处:《泸州医学院》2013年硕士论文 论文类型:学位论文
【摘要】:目的:探讨体外直接转染以大鼠肾间质成纤维细胞(NRK-49F)MAS基因为靶标的小干扰RNA(small interferingRNA,siRNA)后,NRK-49F的MAS基因的mRNA表达和蛋白水平是否受到抑制,筛选出高效的siRNA,为进一步研究MAS基因在肾脏疾病中的作用机制提供实验基础。方法:(1)靶向MAS基因的siRNA的设计及合成:通过NCBI检索大鼠MAS基因序列,按照siRNA序列设计原则设计并合成特异性沉默MAS的siRNA3对:siRNA-1(5'-CCUGACCAGAGCUUUCAAATT-3',5'-UUUGAAAGCUCUGGUCAGGTT-3')、siRNA-2(5'-GACCAAUCAAAUAUGACAUTT-3',5'-AUGUCAUAUUUGAUUGGUCTT-3')、siRNA-3(5'-GCCAUUACUACACAAUCGUTT-3',5'-ACGAUUGUGUAGUAAUGGCTT-3');阴性对照siRNA(siRNA-neg)(5'-UUCUCCGAACGUGUCACGUTT-3',5'-ACGUGACACGUUCGGAGAATT-3')1对。(2)细胞培养:NRK-49F细胞置于DMEM/F12培养基中(含有l0%胎牛血清、100U/ml青霉素和100U/ml链霉素),在37℃、5%CO2的无菌培养箱中,用0.25%胰酶消化传代,,待细胞悬液内的细胞呈对数生长后,将细胞制成1×105/ml的细胞悬液接种于6孔培养板进行实验。(3)实验分组:①MAS siRNA-1:加入含siRNA序列1的转染混合物(transfection complexes,TC);②MAS siRNA-2:加入含siRNA序列2的TC;③MAS siRNA-3:加入含siRNA序列3的TC;④阴性对照组(CG):加入含siRNA阴性序列的TC;⑤空白对照组(NG):只加入转染试剂;每组设3个复孔。(4)转染:将HiPerFect TransfectionReagent12ul与无血清无双抗培养液混合,配成100ul转染液后,再加入终浓度为10nM的siRNA,两者混匀常温孵育5-10分钟。将转染混合物加入六孔板中,轻轻晃动保证转染混合物分布均匀,恒温箱中孵育,48小时后检测转染效率。(5)基因表达检测:应用反转录酶聚合酶链式反应(rever-setranscription-polymerase chain reaction,RT-PCR)与蛋白质印迹法(Western blot)检测转染前后MAS的mRNA与蛋白表达的变化。(6)图像处理:采用Quantity One4.4.0软件测定各组灰度值。(7)统计分析:应用软件spss17.0进行统计学分析,通过单因素方差分析检验各组间差异性,P0.05视为有统计学意义。结果:经siRNA干扰后,3条靶向siRNAs均能不同程度的抑制MAS基因的表达。RT-PCR方法检测结果显示siRNA-1组、siRNA-2组及siRNA-3组NRK-49F细胞MAS的mRNA水平与空白对照组相比显著降低(P〈0.05),各组MAS与GAPDH灰度值的比值分别为0.5772±0.0220,0.3380±0.0434,0.6164±0.0767,抑制率分别达到26.89%,57.12%,21.73%,而阴性对照组和空白对照组之间mRNA的表达水平比较则无显著下降。Western blot方法检测结果显示:3条靶向MAS的特异性序列siRNA蛋白表达水平与空白对照组相比显著降低(P〈0.05),抑制率分别为59.47%,67.81%,50.32%,而阴性对照组和空白对照组之间蛋白的表达水平则无明显差异,与RT-PCR结果基本一致。结论:1.体外转录合成的靶向MAS基因的siRNA可通过阳离子复合物介导瞬时转染至大鼠肾间质成纤维细胞,并发挥基因抑制的作用。2.成功筛选出一组能够高效率特异性沉默大鼠肾间质成纤维细胞MAS基因的siRNA。
[Abstract]:Objective: to investigate the effect of direct transfection of small interfering RNA(small interferingRNA targeting NRK-49 FMAs on rat renal interstitial fibroblasts in vitro. Whether the mRNA expression and protein level of the MAS gene of NRK-49F were inhibited after siRNAs, the highly efficient siRNA was screened out. To provide experimental basis for further study of the mechanism of MAS gene in renal disease. Methods: 1). Design and synthesis of siRNA targeting MAS gene: search rat MAS gene sequence by NCBI. According to the principle of siRNA sequence design, the siRNA3 pair of specific silencing MAS was designed and synthesized. 5 '-CCUGACCAGAGCUUUCAAATT-3'. 5UUGAAAGCUGCUGUCAGGTT-3'siRNA-2UUCAAUAUGACAUTT-3'. 5AUGUUUUUGUGUCTT-3 siRNA-3CCAUUAUACAAUCGUTT-3'. ACGAUGUGUAGUAGCTT-3; Negative control siRNA-negative siRNA-UUCUCCGAACGUGUCGCAUTT-3'. 5ACGUGACACGUGACGGAGAATT-3K1) cells were cultured in DMEM/F12 medium (% NRK-49F). Contains 10% fetal bovine serum. 100 U / ml penicillin and 100 U / ml streptomycin were digested with 0.25% trypsin in a sterile incubator at 37 鈩
本文编号:1446345
本文链接:https://www.wllwen.com/yixuelunwen/shiyanyixue/1446345.html
最近更新
教材专著