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1、萬方數(shù)據(jù)·654·±墾蕉墾塞壘查!!!!堡!旦箜!!鲞笙!塑堡墮!』墮!!!!塑!塞叢竺!竺!!!!!Y!!:!!!叢!:!·糖尿病分子生物學與遺傳學·微小RNA在人胚胎干細胞向胰島樣細胞分化過程中表達的變化魏蕊劉國強洪天配楊進侯文芳高美娟婁晉寧陳貴安【摘要】目的觀察微小RNAs(miRNAs)在人類胚胎f細胞(hES細胞)向胰島樣細胞定向分化過程中的表達及其變化趨勢。方法采用改良的定犁內胚層途徑的誘導方案將hES細胞誘導分化為胰島樣細胞;利用免疫熒光染色和實時定量PCR分析對誘導分化不同階段的細胞進行鑒定;采用葦環(huán)結構的實時定量PCR方法觀察誘導分化后細胞中3種miRNAs的表達,并與
2、成人胰島進行比較。結果hES細胞通過定型內胚層途徑的誘導方案可在體外誘導分化為表達胰島素、C一肽及胰多肽的胰島樣細胞。miR一7、miR一145及miR一375在hES細胞和誘導分化最后階段的細胞中的表達水平較成人胰島減低。結論通過現(xiàn)行的體外誘導分化方案所獲得的胰島樣細胞不是成熟的胰島細胞,miR一375等miRNAs表達水平低是其特征之一?!娟P鍵詞】胚胎干細胞;胰島;微小RNAdoi:10.3969/j.issn.1006—6187.2010.09.005ExpressionofmicroRNAsduringdifferenciationoftheislet-likecellsindu
3、cedfromhumanembryonicstemcellsWUJRui,LIUGuo-qiang,HONGTian—pei,eta1.ClinicalStemCellResearchCenter。PekingUniversityThirdHospital,Beijing100191,ChinaCorrespondingauthor:LfUGuo-qiang,E-mail:liuguoqiang@巧mu.edu.cn[Abstract]ObjectiveToinvestigatewhethermicroRNAs(miRNAs)wereexpressedbyislet-likecellsd
4、ifferentiatingfromhumanembryonicstem(hES)cells.MethodsIslet—likecellswereinducedfromhEScellsbyusinganimprovedstepwiseprotocolsofdefinitiveendoderm.ImmunofluorescencestainingandrealtimequantitativePCRanalysiswereusedtoidentifytheexpressionofisletcell—specificmarkersindifferentiatedcellsatdifferent
5、stages.ThedifferenceintheexpressionofthreemiRNAswasanalyzedbystem-looprealtimequantitativePCRanalysisinthedifferentiatedcellsascomparedwithadulthumanislets.ResultsIslet-likecellsexpressinginsulin,C-peptideandpancreaticpolypeptidecouldbegeneratedfromhEScellsviathein-vitrodifferentiationprotocolsof
6、definitiveendoderm.TheexpressionlevelsofmiR一7,miR一145andmiR一375ineitherthehEScellsortheislet—likeceilswerelowerthanthoseinadulthumanislets.ConclusionsTheislet—likecellsderivingfromhEScellsviathepresentdifferentiationprotocolsarenotmaturepancreaticisletcells,whichischaracterizedbytheloweredexpress
7、ionIevelsofmiR一375andothermiRNAs.[Keywords]Embryonicstemcells;Pancreaticislet;microRNA胰島移植被普遍認為是治愈糖尿病潛在的希望,基金項目:國家863計劃資助項目(2006AA02A112);國家自然科學基金資助項目(30771032。30700879,81070701)l國家973計劃資助項目(z006CB503900)作者單位:100191北京大