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1、干擾AFP蛋白表達的shRNA表達載體的構建及活性鑒定作者:張國英劉明社趙中夫*張蕓楊慧武延雋【摘要】 目的:利用含報告基因EGFP的pGenesil-1質粒構建干擾AFP蛋白表達的短發(fā)夾RNA(shorthairpinRNA,shRNA)表達的載體,并進行活性鑒定。方法:設計表達短發(fā)夾RNA的互補DNA序列,經(jīng)退火成雙鏈,克隆至帶有U6啟動子的質粒載體pGenesil-1中,構建重組質粒,轉化大腸桿菌DH5α菌株,擴增,提取質粒,酶切鑒定后測序分析。構建正確的重組質粒經(jīng)脂質體轉染HepG2細胞,檢測轉染率和培養(yǎng)細胞上清
2、的AFP含量變化,確定重組質粒的活性。結果:構建了靶向AFP蛋白的2個shRNA重組質粒載體pGenesil-1-siAFP1和pGenesil-1-siAFP2。酶切鑒定和測序分析,shRNA編碼序列與設計的片段完全一致,經(jīng)酶切凝膠電泳證實載體構建成功。重組質粒有效轉染HepG2細胞并顯著抑制AFP表達。結論:成功構建具有活性的、能夠表達shRNA靶向干擾AFP蛋白的2個重組質粒載體?!娟P鍵詞】AFP蛋白 RNAi shRNA 重組質粒載體AbstractObjective:Toconstructtherecombina
3、ntplasmidexpressingtwoAFP-targetedshorthairpinRNA(shRNA)withpGenesil-1plasmidsvector,andDetecttheActivityof11RecombinantPlasmidinHepG2cells.Methods:TwopairsofDNAsequencesweredesignedandsynthesized,andformedcomplementarychainsbyannealingrespectively.Thentheobtained
4、products,siAFP1andsiAFP2,wereinsertedintoplasmidvectorpGenesil-1withU6promoter.TherecombinantplasmidsweretransformingintotheEscherichiacolistrainDH5αforscreeningandamplifying.ThesequenceanalysisoftheplasmidsandidentifiedbySalIdigestionwascarriedout.Thebiologicalac
5、tivityofrecombinantplasmidwasdetectedbytransfectingintotheHepG2cellline.Results:ThetwoAFP-targetedshRNAsexpressingframeweresuccessfullyinsertedintothepGensil-1plasmidvectorrespectively,andtheobtainedshRNAscodingsequenceswereconsistentwiththedesignedfragments.There
6、combinantplasmidinhibitedeffectivelytheexpressionofAFPgeneinHepG2cells.Conclusion:TheconstructionoftworecombinantplasmidsofAFP-targetedshRNAwassuccessful.TworecombinantplasmidsexpressingAFP-targetedshRNAinhibitedeffectivelytheexpressionofAFPgeneinHepG2cells.KeyWor
7、dsAFP;RNAinterference;ShorthairpinRNA;HepG2cells11長期以來,人們只是把AFP作為一個腫瘤標志物,用于原發(fā)性肝癌(HCC)的診斷指標之一。諸多研究關注于檢測甲胎蛋白(alpha-fetoprotein,AFP)對原發(fā)性肝癌診斷運用,而對AFP和腫瘤細胞發(fā)生及增殖的關系并不完全清楚[1~3]。近年發(fā)展起來的RNA干擾(RNAinterference,RNAi)技術為探索AFP的生物學功能提供了有力的工具。RNAi技術是通過導入細胞19nt~23nt的小分子干擾RNA(small
8、interferenceRNA,siRNA),降解同源mRNA,高效、特異性阻斷目的基因表達[4~7]。本研究針對人AFP基因設計了2個位點的shRNA表達序列,用人U6啟動子和RNApolymeraseⅢ(PolⅢ)終止信號,構建針對AFP的特異性shRNA真核表達載體,并轉染HepG2細胞鑒定活性,