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1、萬方數(shù)據(jù)華西口腔醫(yī)學雜志第26卷第2期2008年4月WestChinaJournalofStomatologyV01.26No.2Apr.2008【文章編號】1000—1182(2008)02-0206-05靶向抑制人木糖基轉(zhuǎn)移酶一I基因EtCJshRNA真核表達載體的構(gòu)建石宏,王潔,王旭,顧洪濤,侯亞麗,于利潔(河北醫(yī)科大學口腔醫(yī)院病理科,河北石家莊050017)【摘要】目的構(gòu)建靶向抑制人木糖基轉(zhuǎn)移酶一I(XT—I)基因的短發(fā)夾狀RNA(shRNA)真核表達載體,為探討唾液腺腫瘤性肌上皮細胞合成及分泌蛋白多糖(PG)的研究奠定基礎。方法根據(jù)GenBank提供的XT—I基因序列,設計
2、短鏈寡核苷酸,化學合成后經(jīng)退火形成雙鏈DNA片段,克隆至lJPgenesil一1載體中,構(gòu)建shRNA真核表達載體WJl一WJ6,行酶切及核酸測序鑒定;將構(gòu)建的x’r-I特異性shRNA表達載體轉(zhuǎn)染體外培養(yǎng)的人唾液腺腺樣囊性癌細胞株ACC—M,在熒光倒置顯微鏡下觀察綠色熒光蛋白的表達,流式細胞術檢測轉(zhuǎn)染效率,并采用半定量RT—PCR和Westernblot分別檢測轉(zhuǎn)染后細胞XT—I基因mRNA和蛋白表達水平的變化。結(jié)果經(jīng)酶切、連接后構(gòu)建的6個質(zhì)粒命名為WJl、WJ2、WJ3、WJ4、WJ5、WJ6。酶切及核酸測序鑒定證實,構(gòu)建的shRNA表達載體WJl一WJ6序列正確;轉(zhuǎn)染W(wǎng)Jl一W
3、J6后ACC—M細胞均可表達綠色熒光;流式細胞術測定轉(zhuǎn)染效率平均為50.26%;RT—PCR結(jié)果顯示,WJ3顯著抑gljXT-ImRNA的表達,抑制率為72.39%;Westernblot結(jié)果顯示,WJ3有效抑制xT—I的蛋白表達,抑制率為70.18%。結(jié)論成功構(gòu)建靶向抑制XT—I的shRNA真核表達載體WJl一WJ6,其中WJ3可高效抑制XT—I基因mRNA及蛋白水平的表達,為唾液腺腫瘤中PG的RNAi研究奠定了基礎。【關鍵詞】人木糖基轉(zhuǎn)移酶一I;短發(fā)夾狀shRNA;唾液腺腫瘤;肌上皮細胞;蛋白多糖【中圖分類號】R739.87【文獻標識碼】AConstructionofeukary
4、oticexpressionvectorofshorthairpinRNAtargetinghumanxyiosyltransferase-IgeneSHIHong,WANG№,WANGXu,GUHong-tao,HOUYa-li,YULij論、(Dept.ofOralPathology,CollegeofStomatology,HebeiMedicalUniversity,Sh擴iazhuang050017,China)[Abstract]ObjectiveTodesignandconstructtheplasmidsexpressingshorthairpinRNA(shRNA)
5、targetinghumanxylosyltransferase-Io【’r-I)whichistheinitiatingenzymeinthebiosynthesisofproteoglycans(PG).MethodsShortchainoligonucleotidesweredesignedaccordingtothesequenceofXT—IprovidedbyGenBank.TheDNAsegmentsweregainedthroughannealingafterchemosynthesis.a(chǎn)ndwereclonedintoPgenesil-1vector.Therec
6、ombinantXT—IshRNAexpressionvectorswereidentifiedbydigestionandsequencinganalysis.AtlasttheconstructedXT—Iex-pressionvectorsweretransfectedintosalivaryadenoidcysticcarcinomacellline(ACC—M)byLipofectomineTM2000.Theexpressionofgreenfluorescentprotein(GFP)Wasdetectedbyinvertedfluorescentmicroscopea
7、ndtheratesoftransfectionwelt七detectedbyflowcytometer.SemiquantitativeRT-PCRwasusedtodetecttheexpressionofmRNAlevelofXT—IintransfectedACC—McellsandtheproteinexpressionofXT—IWS.8detectedbyWesternblot.ResultsTheplasmidsexpressingshRN