脊髓源星形胶质细胞胶质原纤维酸性蛋白表达抑制最佳短发夹样RNA分子筛选及真核表达载体构建(英文)  

Optimal screening of short hairpin and construction of its eukaryotic expression vector for glial fibrillary acidic protein

作　　者：高明勇[1] 李振宇[1] 闫洪印[1] 

机构地区：[1]南方医科大学附属深圳医院脊柱外科,广东省深圳市518035

出　　处：《中国组织工程研究与临床康复》2007年第27期5450-5454,共5页Journal of Clinical Rehabilitative Tissue Engineering Research

摘　　要：背景:哺乳动物脊髓损伤后胶质瘢痕形成是神经再生的物理和化学屏障,减轻或延缓胶质瘢痕形成给损伤脊髓再生创造了有利条件。目的:设计筛选并构建大鼠胶质原纤维酸性蛋白短发夹样RNA真核表达载体。设计:观察性动物实验。单位:南方医科大学附属深圳医院脊柱外科。材料:选用Wistar大鼠25只,雌雄不拘,清洁级,体质量20～25g。DMEM/F12、lipofectamine2000、Trizol RNA分离试剂盒;胎牛血清(Hyclone);BamHⅠ、HindⅢ、PstI、SalI、T4连接酶;质粒小提试剂盒、DNA凝胶回收试剂盒;第一链cDNA合成试剂盒;兔抗鼠GFAP一抗。方法:实验于2005-10/2006-06在南方医科大学附属深圳医院完成。针对GFAP基因全编码序列设计并合成3对9bp茎环结构19bp干扰序列特异性shRNA模板,体外定向克隆构建特异性重组质粒真核表达载体;通过体外大鼠脊髓源星形胶质细胞GFAP表达抑制模型,脂质体介导RNA干扰分子转染,由实时荧光定量RT-PCR及western blot技术,观察RNA干扰后原代星形胶质细胞GFAP表达抑制效果,筛选最佳GFAP表达干扰抑制真核表达载体。主要观察指标:①序列特异性干扰shRNA模板合成;②构建特异性重组质粒真核表达载体;③体外大鼠脊髓源星形胶质细胞培养;④实时荧光定量RT-PCR;⑤RNA干扰后原代星形胶质细胞GFAP表达抑制效果。结果:序列测定证实GFAP-shRNA重组质粒真核表达载体构建成功,通过实时荧光定量RT-PCR、western blot技术筛选出最佳GFAP-shRNA效应表达载体,在mRNA及蛋白表达水平抑制靶基因表达效率分别为81%、63%、56%。结论:构建并筛选成功的GFAP-shRNA效应真核表达载体,在大鼠原代星形胶质细胞GFAP表达抑制模型中能高效抑制GFAP-基因表达,为后续多靶点RNA干扰技术在脊髓损伤胶质瘢痕抑制基因治疗研究策略的应用奠定前期基础。BACKGROUND： The glial scar formation after spinal cord injury in mammals is the physical and chemical barriers for neural regeneration, and relieving or delaying glial scar formation can provide benefit conditions for the regeneration of injured spinal cord.OBJECTIVE： To design and screen short hairpin RNA （shRNA） interfere molecular targeting the gene coding region of glial fibrillary acidic protein （GFAP） in rat, and reconstruct the eukaryotic vector of shRNA.DESIGN： An observational animal experiment.SETTING： Department of Spine Surgery, Shenzhen Hospital affiliated to Southern Medical University.MATERIALS： Twenty-five Wistar rats of clean degree, either male or female, weighing 20-25 g, were used. DMEM/F12,lipofectamine2000, Trizol RNA separating kits）; fetal bovine serum （Hyclone）; BamH Ⅰ, HindⅢ, Pstl, Sail and T4 ligases;Plasmid mini preparation kit and DNA gel extraction kit.METHODS： The experiments were carried out in the Shenzhen Hospital affiliated to Southern Medical University from October 2005 to June 2006. Three pairs of shRNA template which composed of 19 bp reverse repeated motif of GFAP target sequence with 9 bp spacer were designed and synthesized, then they were inserted directionally into plasmid Psilencer 2.1 respectively to generate small interfering RNA （siRNA） eukaryotic expression vector. ShRNA molecules were transfected by liposome via ex vivo expression repressive model of GFAP of rat spinal astrocytes. The effects of expressive suppression were detected with real-time fluorescence quantitative reverse transcription-polymerase chain reaction （RT-PCR） and Western blot, and then the optimal shRNA eukaryotic vector of repressive expression of GFAP was screened.MAIN OUTCOME MEASURES： ① Interfering sequence specific shRNA template synthesis; ② Constructing specific recombinant plasmid eukaryotic expression vector. ③ Culturing rat spinal astrocytes in vitro; ④ Effects of expressive suppression on GFAP in primary astrocytes after RNA interference

关 键 词：GFAP RNA干扰 siRNA 胶质瘢痕 

分 类 号：R681.5[医药卫生—骨科学]