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1、·1062·臨床腫瘤學(xué)雜志2013年12月第18卷第12期ChineseClinicalOncology,Dec.2013,Vo1.18,No.12miR.206對三陰性乳腺癌細(xì)胞的增殖抑制作用及初步機(jī)制研究210000南京南京醫(yī)科大學(xué)第二附屬醫(yī)院腫瘤科石永國,卞衛(wèi)和,何燁,丁潔,周晶,王科明,【摘要】目的探討miR-206對三陰性乳腺癌細(xì)胞MDA.MB-231增殖的影響及其作用機(jī)制。方法轉(zhuǎn)染miR-206mimic和miR.NC至乳腺癌細(xì)胞株MDA.MB-231中,應(yīng)用實時熒光定量PCR(qRT.PCR)技術(shù)檢測m
2、iR-206相對表達(dá)水平;應(yīng)用MTI'法、克隆形成實驗檢測miR-206對MDA.MB-231細(xì)胞增殖能力的影響;流式細(xì)胞術(shù)檢測miR-206對細(xì)胞周期的影響;Westernblotting進(jìn)一步驗證miR-206對周期相關(guān)蛋白CyclinD2的影響。結(jié)果qRT—PCR檢測結(jié)果顯示,miR一206mimic轉(zhuǎn)染至MDA.MB-231乳腺癌細(xì)胞48h后miR-206的相對表達(dá)水平為10.2±1.5。MTr法檢測結(jié)果顯示,miR-206mimic轉(zhuǎn)染至MDA.MB-231乳腺癌細(xì)胞6、24、48、72、96h后的增殖抑制
3、率分別為(04-0.O1)%、(0.124-0.03)%、(0.214-0.08)%、(0.284-0.11)%和(0.394-0.16)%;克隆形成實驗結(jié)果顯示,miR-206mimic和miR—NC轉(zhuǎn)染至MDA—MB-231乳腺癌細(xì)胞2周后的克隆數(shù)目分別為1064-35和843±143,差異具有統(tǒng)計學(xué)意義(P<0.01)。流式細(xì)胞術(shù)檢測結(jié)果顯示,miR-206mimic轉(zhuǎn)染至MDA.MB-231乳腺癌細(xì)胞48h后,明顯地阻滯細(xì)胞周期于G1期;Westernblotting檢測顯示miR-206表達(dá)下調(diào)了細(xì)胞周期蛋
4、白CyclinD2的表達(dá)。結(jié)論miR-206明顯抑制了三陰性乳腺癌細(xì)胞株MDA-MB-231的增殖,其機(jī)制可能與下調(diào)細(xì)胞周期蛋白CyclinD2的表達(dá)有關(guān),這將成為乳腺癌臨床治療一個新的靶點(diǎn)。【關(guān)鍵詞】miR-206;細(xì)胞周期蛋白D2;乳腺癌中圖分類號:R737.9文獻(xiàn)標(biāo)識碼:A文章編號:1009—0460(2013)12—1062—04TheinhibitoryefectsofmiR-206ontripienegativebreastcancercellproliferationanditsmechanismSH/
5、Yongguo,BIAN耽e,HEYe,DINGJie,ZHOUJing,WANGKeming.DepartmentofOncology,theSecondAffiliatedHospitalofNanfingMedicalUniversity,Nanjing210000,ChinaCorrespondingauthor:WANGKeming,E-mail:wkmys@sohu.corn【Abstract】ObjectiveToinvestigatetheefectofmiR-206ontheproliferatio
6、noftriplenegativebreastcancercellMDA—MB一231invitroanditsactionmechanism.MethodsMiR-206MiR.206mimicandmiR.NCweretransfectedintoMDA.MB-231breastcancercel1.TheexpressionlevelofmiR-206wasdetectedbyrealtimequantitativePCR(qRT-PCR).MTYandcolonyformationas—sayswereuse
7、dtodetecttheefectofmiR-206onbreastcancercellproliferation.Flowcyt0metrywasusedtodetecttheefectoncellcycle.WesternblottingwasusedtoanalyzetheexpressionofcyclinD2inbreastcancercellaftertransfectedwithmiR-206.ResultsTheresultsofqRT-PCRshowedthattherelativeexpressi
8、onofmiR-206was10.24-1.5whenMiR-206mimicwastransfeetedintoMDA-MB-231breastc~qeercellfor48h.TheinhibitionrateofMDA—MB-231breastco/leercellwhichwastransfectedbymiR-206mimicfor6