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1、《中国神经肿瘤杂志》2010,8(2):75-8175·论著·mTOR信号通路调控CD133阳性胶质瘤干细胞自我更新的分子机制付军1,21,21,2,刘晓梅,陈忠平(1.华南肿瘤学国家重点实验室,广东广州510060;2.中山大学肿瘤防治中心神经外科/神经肿瘤科,广东广州510060)【摘要】背景与目的:mTOR(mammaliantargetofrapamycin)信号通路异常活化和高级别胶质瘤患者的预后不良相关。本研究探讨mTOR信号通路调控胶质瘤干细胞(GSCs)自我更新相关的分子机制。方法:采用CD133免
2、疫磁珠分选CD133阳性胶质瘤干细胞。Westernblot检测mTOR信号通路组分p-S6K、p-S6和干细胞自我更新相关基因Bmi-1的表达水平;Rapamycin(RPA)阻断mTOR信号通路后,用肿瘤球形成实验评价干预mTOR信号通路对胶质瘤干细胞自我更新的影响;统计学处理采用SPSS11.0统计分析软件分析。结果:CD133阳性胶质瘤干细胞表达较高水平的mTOR信号通路组分p-S6K、p-S6和干细胞自我更新相关分子Bmi-1。通过rapamycin阻断mTOR信号通路,可诱导胶质瘤干细胞谱系分化,同时显
3、著降低肿瘤球形成能力(P<0.05),而自噬抑制剂3-MA处理不能逆转rapamycin的效应。结论:mTOR信号通路能够调控胶质瘤干细胞自我更新,阻断mTOR通路下调胶质瘤干细胞自我更新潜能。关键词:胶质瘤干细胞;mTOR信号通路;自我更新中图分类号:R739.41文献标识码:A文章编号:1726-8192(2010)02-0075-07mTORSignalingPathwayRegulatesSelf-renewalofCD133PositiveGliomaStemCells1,21,21,2JunFu,Xia
4、o-meiLiu,Zhong-pingChen1.StateKeyLaboratoryofOncologyinSouthChina,Guangzhou510060,P.R.China;2.DepartmentofNeurosurgery/Neuro-oncology,CancerCenter,SunYat-senUniversity,Guangzhou510060,P.R.China【ABSTRACT】BACKGROUND&OBJECTIVE:Activationofmammaliantargetofrapamyc
5、in(mTOR)hasbeenassociatedtopoorprognosisofgliomapatients.ThisstudywasdesignedtoinvestigatetheregulatorymechanismsofmTORsignalingonself-renewalofgliomastemcells(GSCs).METHODS:CD133+GSCshavebeenisolatedbyusingCD133magneticbeadsfromhumanglioblastomaspecimensandgl
6、iomacelllineSKMG-4andwerepropagatedwithoutseruminvitro.Molecularmarkersforgliomastemcells(CD133,nestin,Sox-2,GFAPandTuJ1)weredetectedbyimmunofluorescentstaining.mTORsignalingpasswaywasinactivatedbyrapamycintreatment.Self-renewalwastestedbytumorsphereformationa
7、ssay.ThephosphorylationstatusofmTORcomponentswasdeterminedbyWesternblotanalysis.AllstatisticalanalyseswereperformedusingtheSPSSsoftwarepackage,version11.0.RESULTS:Thelevelsofp-S6Kandp-S6,componentsofmTORsignaling,werehigherinCD133+GSCsthanmatchedCD133-cells.GS
8、CfractionsalsoexpressedhighlevelsofBmi-1,akeyregulatorofneuralstemcellself-renewal.InhibitionofthemTORsignalingpathwaybyrapamycinresultedinareductionof.tumorsphereformation,whichis