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1、碩士學(xué)位論文013±0.654)%。4.轉(zhuǎn)染前后MCF.7細胞增殖能力的變化:平板克隆形成實驗結(jié)果顯示siRNA轉(zhuǎn)染入MCF.7細胞后細胞克隆形成率降低;MTT法檢測結(jié)果顯示,實驗組細胞增殖能力低于空白對照組(P=O.000),陰性對照組與空白對照組之間差異無統(tǒng)計學(xué)意義(尸生O.167);5.根據(jù)平板克隆形成實驗結(jié)果計算出不同X線照射劑量下的細胞存活分數(shù),對存活分數(shù)按照單擊多靶模型進行擬合。放射生物學(xué)參數(shù)顯示,POLQ沉默組MCF.7細胞后Do、Dq值顯著降低,放射增敏比(SER)等于1.24,提示轉(zhuǎn)染POLQ—siRNA后MCF.7細胞對放射的敏感性顯著增強。6.細胞周期結(jié)果顯示,未照射
2、時POLQ.siRNA組S期細胞比例低于空白對照組儼0.001);Contr01.siRNA組與空白對照組比較差異無統(tǒng)計學(xué)意義(e=-0.952)。0、4和8Gy時POLQ-siRNA組Go/Gi期細胞均高于空白對照組,Contr01.siRNA組與空白對照組之間差異無統(tǒng)計學(xué)意義。隨著照射劑量的增加,POLQ.siRNA組、Contr01.siRNA與空白對照組細胞G2/M期比例均提高(尸<0.01)。在不同照射劑量下,POLQ—siRNA組細胞凋亡率均高于空白對照組,Contr01.siRNA組與空白對照組比較差異無統(tǒng)計學(xué)意義。當照射劑量d:14Gy增大至8Gy時,3組細胞凋亡率均減小(
3、P<0.01)。結(jié)論:POLQ在人類乳腺癌細胞株MCF一7中高表達,siRNA可以有效沉默POLQ在MCF.7中的表達;POLQ沉默可以減弱MCF.7細胞的增殖能力,提高該細胞Go/Gl期比例和凋亡率,顯著提高對放射的敏感性;持續(xù)增加x線照射劑量將導(dǎo)致MCF.7細胞G2/M期比例增加,而不能導(dǎo)致凋亡率持續(xù)增加。關(guān)鍵詞:乳腺癌;小干擾RNA;細胞增殖;細胞周期;細胞凋亡;放射敏感性V碩士學(xué)位論文EffectofDNApolymerase0inbreastcancercelllineMCF.7ontheproliferation,aooptosisandtheradiationtlleraia
4、tiOn,sensitivityName:LiXue—xiaoBackground:Supervisor:WuAi—guoABSTRACTBreastcancerisoneofthemostcommonmalignanttumorsinOLU"country,ittakes7%---8%ofthemalignanttumors,beonlyinferiortotheuterinecervicalcancer,ithasapredispositionmorethancervicalcancerinrecentyears,andshowsarisingtrendyearbyyear.Insom
5、ebigcitysitaccountsforthefirstfemalemalignanttumorst11.Fromtheendofthenineteenthcenturyon,radicalmastectomy(orimprovedradicalmastectomy)inbreastcancertreatmenthasplayedanirreplaceableroleinthefieldofcontrolingofdiseaseprogression,andthefieldofimprovingsurvivalrate.Butitspostoperativecomplicationsa
6、reproblemsCan’tbeignored.Breast-conservingsurgerycardedoutstepbystepalongwiththeceaselessprogressofthemedicaldevice,methodandtechnology.Breast-conservingsurgerypossessesaimportantroleinthepreservationofphysiologicalfunction,beautyandlittlecomplicationscomparedwiththetraditionalradicalcystectomy,wh
7、ichgreatlyimprovedthequalityofpatients’life,andmakeanimprovementinthementaldisorderssignificantly_【21.Butwithitshighlocalrecurrencerate,radiotherapywillbeappliedafteroperationbasedonconditions,whichCaneffectively