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ID:18164320
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时间:2018-09-15
《靶向xt1基因shrna真核表达质粒载体的构建及筛选》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、万方数据靶向XT.1基因shRNA真核表达质粒载体的构建及筛选余资江1。余德立2(1贵阳医学院,贵州贵阳550004;2贵阳中医学院第二附属医院)[摘要]目的构建靶向木糖转移酶-1(XT一1)的短发卡状小干扰RNA(shRNA)质粒表达载体;为寻找脊髓损伤治疗的新靶点提供工具。方法设计4个小分子短发卡状RNA(siRNA)序列,体外合成DNA模板引物,与Pgenesil-l质粒构建成编码shRNAR的表达载体,进行酶切和测序,再转染体外培养的星形胶质细胞,筛选靶序列。结果构建的质粒表达载体完全符合设
2、计要求,转染成功的细胞在荧光显微镜下显示绿色荧光,G418可以筛选出阳性克隆。结论成功构建了编码XT-1.shRNA的质粒表达载体;该载体为寻找脊髓损伤治疗的新靶点奠定了基础。[关键词】硫酸软骨素蛋白多糖;木糖转移酶.1;小分子干扰RNA;短发卡状RNA;质粒载体[中图分类号]R322.81[文献标识码]A【文章编号]1002.266X(2009)03-0019-03EstablishandselectionofplasmidexpressivevectorcodingshRNAtargetingX
3、T-1YUZi-jian91.YUDe.1i(1CuiyangMedicalCollege,Cuiyang550004,只R.China)Abstract:ObjictiveToestablishandselecttheplasmidexpressivevectorcodingshorthairpinRiga(shRNA)tar-getingxylosyltransferase·1(XT-I),inordertofindanewtherapeutictargetforthetreatmentofsp
4、inalcordinjury.Meth·odsFoursequencesofsmallinterferenceRNA(siRNA)weredesigned.DNAtemplateprimerofXT-1惴synthesizedinvitroandtheplasmidexpressivevectorscodingshRNAwereestabhshedwithpGenesil一1plasmid,thenwereidentifiedbydigestionandtestedforthesequence.Th
5、eastrocyeesweretransfeetedwithplasmidvictor,andthenweretakenfluores-cencephotographsandselectedbyG418.ResultsThedigestionidentificationofphsmidvectorsconfirmedthatDNAtern·plateprimerWtagsuceessfullyinsertedintheplasmidandthesequenceWaSinconformitywitht
6、hedesignedresult.Aftertheplasmidw=etorwithglx把nfluorescentproteinW88transfectedtothecells.itwasseen∞agreenfluorescentwave.Theposi-tirecloneswerealsosuccessfullyselected.ConclusionPlasmidexpressivevectorscedingXT-1shRNAcallbeSUCC@SS-fullyestablishedandc
7、apableofstabletransfeetion,andwhichprovidedanewtherapeuticfoundationforthetreatmentofspinalcordinjury.Keywords:ehondroitinsulphateproteoglycans;xylosyltransferase-1;8mallinterferenceRNA;shorthairpinRNA;plasmidexpressive脊髓损伤是常见的危重疾病,胶质瘢痕在脊髓损伤后形成并逐渐加剧,是抑
8、制脊髓修复的关键因素之一⋯。硫酸软骨素蛋白多糖(CSPGs)是胶质瘢痕内重要抑制成分,由糖胺聚糖(GAG)链与不同核心蛋白共价结合形成,包括Phosphacan、Neuroean、brevican、NG2及aggrecan等【2J。脊髓损伤不同时期,胶质瘢痕内细胞成分及CSPGs水平不同最终构成胶质瘢痕的主要成分∞1。研究表明,木糖转移酶(XT.1)是合成CSPGs中GAG的关键酶,GAG合成的起始步骤是在XT.1催化下,将一分子木糖基连接到核心蛋白多肽链的丝氨酸残基
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