資源描述:
《靶向xt1基因shrna真核表達質粒載體的構建及篩選》由會員上傳分享,免費在線閱讀,更多相關內容在學術論文-天天文庫。
1、萬方數據靶向XT.1基因shRNA真核表達質粒載體的構建及篩選余資江1。余德立2(1貴陽醫(yī)學院,貴州貴陽550004;2貴陽中醫(yī)學院第二附屬醫(yī)院)[摘要]目的構建靶向木糖轉移酶-1(XT一1)的短發(fā)卡狀小干擾RNA(shRNA)質粒表達載體;為尋找脊髓損傷治療的新靶點提供工具。方法設計4個小分子短發(fā)卡狀RNA(siRNA)序列,體外合成DNA模板引物,與Pgenesil-l質粒構建成編碼shRNAR的表達載體,進行酶切和測序,再轉染體外培養(yǎng)的星形膠質細胞,篩選靶序列。結果構建的質粒表達載體完全符合設
2、計要求,轉染成功的細胞在熒光顯微鏡下顯示綠色熒光,G418可以篩選出陽性克隆。結論成功構建了編碼XT-1.shRNA的質粒表達載體;該載體為尋找脊髓損傷治療的新靶點奠定了基礎。[關鍵詞】硫酸軟骨素蛋白多糖;木糖轉移酶.1;小分子干擾RNA;短發(fā)卡狀RNA;質粒載體[中圖分類號]R322.81[文獻標識碼]A【文章編號]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脊髓損傷是常見的危重疾病,膠質瘢痕在脊髓損傷后形成并逐漸加劇,是抑
8、制脊髓修復的關鍵因素之一?。硫酸軟骨素蛋白多糖(CSPGs)是膠質瘢痕內重要抑制成分,由糖胺聚糖(GAG)鏈與不同核心蛋白共價結合形成,包括Phosphacan、Neuroean、brevican、NG2及aggrecan等【2J。脊髓損傷不同時期,膠質瘢痕內細胞成分及CSPGs水平不同最終構成膠質瘢痕的主要成分∞1。研究表明,木糖轉移酶(XT.1)是合成CSPGs中GAG的關鍵酶,GAG合成的起始步驟是在XT.1催化下,將一分子木糖基連接到核心蛋白多肽鏈的絲氨酸殘基