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1、中國免疫學(xué)雜志2014年第3O卷doi:10.3969/j.issn.1000-484X.2014.08.013沉默Glil基因?qū)θ朔切〖?xì)胞肺癌A549/DDP順鉑耐藥性的影響達(dá)麗雋李華張獻(xiàn)全(重慶醫(yī)科大學(xué)附屬第二醫(yī)院腫瘤科,重慶400010)中圖分類號R734.2文獻(xiàn)標(biāo)志碼A文章編號1000-484X(2014)08-1064-05[摘要]目的:以GlilsiRNA轉(zhuǎn)染人肺腺癌耐藥細(xì)胞A549/DDP,研究其對靶細(xì)胞順鉑耐藥性的影響。方法:以GlilsiRNA轉(zhuǎn)染A549/DDP細(xì)胞,分別從mRNA
2、和蛋白水平檢測干擾效果,同時(shí)檢測蛋白Bcl一2、caspase一3、cyclinD1的變化;Hoechst33258染色觀察各組細(xì)胞自發(fā)性凋亡情況;流式細(xì)胞術(shù)檢測細(xì)胞周期;MTI"法測定順鉑對各組細(xì)胞的半數(shù)抑制濃度(IC50);AnnexinV—FITC法檢測順鉑誘導(dǎo)的細(xì)胞凋亡率。結(jié)果:轉(zhuǎn)染GlilsiRNA能有效抑制Glil在mRNA和蛋白水平上的表達(dá)(P=0.001);Bel-2和cyclinD1蛋白表達(dá)水平明顯下降(P=0.003),caspase-3表達(dá)量顯著升高(P=0.001);實(shí)驗(yàn)組細(xì)胞
3、的自發(fā)性凋亡率高于對照組;細(xì)胞周期顯示:GlilsiRNA能使更多細(xì)胞停滯在G1期;IC50值由干擾前的(12.63±1.11)Ixg/ml/(13.81±1.14)Ixg/ml下降為干擾后的(2.65+0.85)ml(P=0.ooo);順鉑誘導(dǎo)的細(xì)胞凋亡率明顯提高(35.19%±3.92%vs6.43%-4-0.1l%/5.01%±0.77%,P:0.000)。結(jié)論:利用RNA干擾技術(shù)能有效抑制Glil基因的表達(dá),提高A549/DDP細(xì)胞對順鉑的敏感性。這將為逆轉(zhuǎn)肺癌細(xì)胞的耐藥性提供新的研究思路和作
4、用靶點(diǎn)。[關(guān)鍵詞]Glil基因;肺癌;RNA干擾;順鉑耐藥;凋亡ImpactsofGlilsilencingoncisplatinresistanceoflungcancercellA549/DDPDALi-Jun,LIHua,ZHANGXian—Quan.DepartmentofOncology,theSecondAffiliatedHospital,ChongqingMedicalUniversity,Chongqing400010,China[Abstract]Objective:Toinves
5、tigatetheroleofGlilinDDP—resistanceinlungcancer.Methods:ADDP—resistanthumanlungadenocarcinomacelllineA549/DDPwasculturedandtransfectedwithGlilsiRNA.ThemRNAandproteinexpressionlevelsofGlilwereevaluatedbyqPT-PCR,Westernblotanalysisandimmunofluorescencemic
6、roscopy.TheexpressionofBcl-2、caspases一3、cyclinD1wasevaluatedbyWesternblotanalysis.Hoechst33258stainingandflowcytometrywereusedtodetectspontaneouscellapoptosisandcellcycle.ThecellinhibitionrateandDDP.inducedcelldeathwereexaminedbyMTrandAnnexinV—FITC/prop
7、idiumiodidestaining.Results:Glil-knockdownbyusingGill·specificsiRNAledtoamarkedlydecreaseinGlilmRNAandproteinexpressionlevels,whencomparedtonegativesiRNAtransfeetedcellsanduntreatedcontrolcells(P=0.001).ThedownstreameffectorsofGlil,Bcl-2andcyclinD1prote
8、inswerealsoinhibited(P=0.003),theexpressionofcaspase一3wasincreased(P=0.001).Hoechst33258stainingshowedthatGli1depletionbyGlilsiRNAinA549/DDPcellscouldinducespontaneousapoptosis.TheresultofcellcycleshowedGlilsiRNAcouldleadmoreceHs