Caveolin-1-shRNA慢病毒构建及其对TNF-α致大鼠肺微血管内皮细胞通透性增高的影响
发布时间:2018-03-02 06:13
本文关键词: 肺微血管内皮细胞 通透性 小窝蛋白-1RNAi 出处:《安徽医科大学》2012年硕士论文 论文类型:学位论文
【摘要】:目的构建caveolin-1基因RNA干扰慢病毒,观察抑制caveolin-1基因表达后对大鼠肺微血管内皮细胞通透性的影响。为进一步研究caveolin-1在ALI/ARDS发病机制中的作用奠定实验基础。 方法体外分离培养RPMVEC;采用RT-PCR及Western blot检测RPMVEC中caveolin-1的表达;选定大鼠caveolin-1基因RNA干扰的靶序列,,合成靶序列DNA,退火成双链后与经XhoⅠ和HpaⅠ双酶切后的慢病毒载体pLentilox3.7连接;重组pLL3.7-caveolin-1慢病毒载体转化大肠杆菌DH5α,提取质粒后,经限制性内切酶XbaⅠ和XhoⅠ酶切鉴定后进行测序鉴定;慢病毒载体质粒pLL3.7和包装质粒VSV-G,RSV-REV,pMDL在脂质体2000的介导下共转染包装细胞293T细胞,包装慢病毒,病毒上清经浓缩后,按一定比例稀释后感染293T细胞,荧光显微镜下观察GFP蛋白的表达,测定病毒滴度;通过Western blot检测Caveolin-1shRNA慢病毒感染RPMVEC后对caveolin-1基因表达的抑制;通过检测跨内皮细胞电阻观察caveolin-1基因表达抑制对TNF-α所致RPMVEC单层通透性增高的影响。 结果1.体外成功分离、培养RPMVEC。2.通过RT-PCR和Western blot证实RPMVEC表达caveolin-1。3.经酶切和测序证实,成功构建慢病毒表达载体pLL3.7-caveolin-1shRNA。4.包装的慢病毒经浓缩后的病毒悬液滴度为2×108TU/ml。5.Western blot证实慢病毒感染RPMVEC后,caveolin-1的表达明显下调,72h后caveolin-1表达被抑制85%。6.Caveolin-1表达抑制能显著改善TNF-α所致RPMVEC单层TER的降低,与正常RPMVEC刺激组相比,抑制组30min时即出现差异,6h时差异最大,24h后差异不明显。(P<0.05)。 结论1.RPMVEC表达caveolin-1。2.成功构建大鼠caveolin-1基因RNAi慢病毒。3.慢病毒感染RPMVEC后显著抑制caveolin-1的表达。4.抑制RPMVEC中caveolin-1的表达可显著改善TNF-α致RPMVEC单层通透性的增高。
[Abstract]:Objective to construct caveolin-1 gene RNA interfering lentivirus and observe the effect of inhibiting the expression of caveolin-1 gene on the permeability of rat pulmonary microvascular endothelial cells in order to further study the role of caveolin-1 in the pathogenesis of ALI/ARDS. Methods RPMVECs were isolated and cultured in vitro, the expression of caveolin-1 in RPMVEC was detected by RT-PCR and Western blot, the target sequence of rat caveolin-1 gene RNA interference was selected, the target DNA was synthesized and annealed into double strand, and then connected with the Lentivirus vector pLentilox3.7 which was digested by Xho 鈪
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