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1、中國腫瘤生物治療雜志http://www.biother.orgChinJCancerBiother,Dec.2012,Vo1.19,No.6·582·DOI:10.3872/j.issn.1007-385X.2012.06.003·研究快報·miRNA-200c通過抑制Akt通路提高胃癌SGC7901/DDP細(xì)胞對順鉑的敏感性陳勇,左靜,張西志,汪步海,劉穎,高鴻,劉巍(1.蘇北人民醫(yī)院腫瘤內(nèi)科,江蘇揚州225002;2.河北醫(yī)科大學(xué)第四醫(yī)院腫瘤內(nèi)科,河北石家莊050011)[摘要]目的:研究miRNA一200c對人胃癌耐藥SGC79
2、01/DDP細(xì)胞順鉑敏感性的影響及其機(jī)制。方法:Westernblotting檢測SGC7901/DDP及其親代SGC7901細(xì)胞E—cadhefin、PTEN、p-Akt及總Akt蛋白的表達(dá);瞬時轉(zhuǎn)染miRNA-200c前體(miR—NA-200cprecursor,Pre一200c)提高SGC7901/DDP細(xì)胞miRNA-200c的表達(dá),MTF法檢測轉(zhuǎn)染后SGC7901/DDP細(xì)胞對順鉑的敏感性,并分析p-Akt表達(dá)的改變;應(yīng)用Akt通路抑制劑LY94002處理SGC7901/DDP細(xì)胞抑制Akt磷酸化,檢測處理后細(xì)胞對順鉑的敏感
3、性。結(jié)果:與SGC7901細(xì)胞相比,SGC7901/DDP細(xì)胞中p-Akt蛋白的表達(dá)量顯著增高(1.02±0.090.17±0.02,P<0.05),E—cadherin、PTEN蛋白的表達(dá)量顯著降低(0.10-4-0.03vs0.47±0.06,0.18±0.06vs0.874-0.06;均P<0.05)。轉(zhuǎn)染Pre一200c后,順鉑對SGC7901/DDP細(xì)胞的Ic50顯著低于對照組[(7.52±0.19)(12.18±0.29)mg/L,P<0.05],細(xì)胞中P—Akt蛋白的表達(dá)量也顯著低于對照組(0.22±0.04s0.69±0
4、.09,P<0.05);LY94002處理后,SGC7901/DDP細(xì)胞p-Akt蛋白的表達(dá)顯著抑制(0.18±0.06us0.66±0.10,P<0.05),順鉑對細(xì)胞的Ic顯著低于對照組[(6.80±0.28)vs(11.94±1.73)mg/L,P<0.05]。結(jié)論:SGC7901/DDP細(xì)胞的耐藥可能與E-cadhefin和PTEN蛋白的表達(dá)缺失及Akt通路的異常激活有關(guān),而miRNA一200c提高該細(xì)胞對順鉑的敏感性可能是通過抑制Akt通路而發(fā)揮作用。[關(guān)鍵詞]miRNA一200c;胃癌細(xì)胞;SGC7901;耐藥;磷酸化Akt
5、;Akt[中圖分類號]R735.2;R730.5[文獻(xiàn)標(biāo)志碼]A[文章編號]1007.385X(2012)06-0582-06miRNA-200cenhancessensitivityofgastriccancerSGC7901/DDPcellstocisplatinthroughinhibitingAktpathwayCHENYong,ZUOJin,ZHANGXi.Zhi,WANGBu—hai,LIUYing,GAOHong,LIUWei(1.DepartmentofMedicalOncology,SubeiPeople’sHospi
6、tal,Yangzhou225002,Jiangsu,China;2.DepartmentofMedicalOncology,F(xiàn)ourthHospitalofHebeiMedicalUniversity,Shijiazhuang050011,Hebei,China)[Abstract]Objective:ToexploretheeffectofmiRNA-200conchemosensitivityofdrug—resistanthumangastriccancerSGC7901/DDPcellstocisplatin(DDP)andi
7、tsmechanism.Methods:TheexpressionsofE—eadhefin,PTEN,p-AktandtotalAktproteinsinSGC7901/DDPcellsanditsparentalSGC7901cellsweredetectedbyWesternblotting.miRNA一200cprecursor(Pre-200c)wastransientlytransfectedintoSGC7901/DDPcellstoincreasetheexpressionofmiRNA-200c.Thedrugsens
8、itivityofcellstocisplatinandtheexpressionlevelofp-AktweredetectedbyMTTassayandWesternblotting,respectiv