雷帕霉素对肺癌细胞mTOR信号通路相关蛋白表达的作用

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DOI:10.3971/j

.issn.1000-8578.2011.10.003收稿日期:2010-09-28;修回日期:2011-03-

22基金项目:广州市教育局科技基金资助项目(穗教科[2006]61035);广东省医学科研基金资助项目(A2010248

)作者单位:1.510260广州,广州医学院第二附属医院肿瘤科;2.

中山大学肿瘤防治中心作者简介:曾波航(1963-)

,男,博士,教授,主要从事肿瘤靶向治疗研究

雷帕霉素对肺癌细胞mTOR信号通路相关蛋白表达的作用

曾波航1,庄 莹1,陈静琦1,江素华1,曾木圣2

Effects of Rapamycin on Expression of mTOR Signaling Pathway Relative Protein in LungCancer 

CellZENG Bo-hang1

,ZHUANG Ying1

,CHEN Jing-qi 1

,JIANG Su-hua1

,ZENG Mu-sheng2

1.Department of Oncology,Second Affiliated Hospital,Guangzhou Medical University,Guang

zhou510260,China;2.Sun Tat-sen University 

Tumor CencerAbstract:Objective To investigate the relation between the function state of mTOR signal pathway andrapamycin sensitivity to lung cancer.Methods mTOR signaling pathway protein in 4 lung cancer celllines(HLAMP,H1299,A549 and PAa)were detected by Western Blot.MTT method was used to deter-mine the inhibitory effect of rapamycin on human lung cancer cell.Lung cancer cell lines were divided intorapamycin sensitive group and non-sensitive group.En Vision method was used to detecte the expressionof rapamycin differential protein in 100 lung cancer and 20 lung nonmalignant disease normal lung tis-sues.Result AKT,S6K1,4E-BP1,eIF4E were expressed in all human lung cancer cell lines.P-S6K1 washigh-level expression in sensitive cell lines,no detection in non-sensitive cell line,and it was arapamycindifferential protein.P-S6K1 positive-expression rate was 15%(3/20)in normal lung tissues,and 62%(62/100)in lung cancer,respectively.P-S6K1 positive-expression rate in small cell lung cancer(81%,17/21)was higher than that in non-small cell lung cancer(59%,45/79).Conclusion The expression of P-S6K1in human lung cancer cell lines may reflect rapamycin sensitivity to cancer cell to a extent.But othermTOR signaling pathway protein(AKT,S6K1,eIF4E,4E-BP1)can not reflect rapamycin sensitivity tolung cancer cell.P-S6K1 isarapamycin differential protein.The expression of P-S6K1 in small cell lungcancer is much higher than that in non-samll cell lung cancer.The results suggest the better clinical effectof mTOR inhibitor-rapamycin in small cell lung cancer.Key 

words:Lung Cancer;Rapamycin;mTOR摘 要:目的 探讨mTOR信号通路的功能状态与肺癌对雷帕霉素敏感度的关系。方法 Westernblot检测mTOR信号通路中AKT、S6K1、eIF4E、4E-BP1、P-S6K1蛋白在4种人肺癌细胞株的表达;MTT法检测雷帕霉素对肺癌细胞增殖的抑制情况,将肺癌细胞分为雷帕霉素敏感组和不敏感组,找出与敏感度相关的差异蛋白,用En Vision法检测患者肺癌组织中差异蛋白的表达。结果 AKT、S6K1、eIF4E、4E-BP1蛋白在4种肺癌细胞株中均有表达。而P-S6K1在不敏感株中未检测到,在敏感株中呈高表达,为雷帕霉素差异蛋白。P-S6K1在正常肺组织中的阳性表达率为15%(3/20例),在肺癌组织中的阳性表达率为62%(62/100例),其中在小细胞肺癌组织中的阳性表达率(81.0%,17/21例)高于非小细胞肺癌组织(59%,45/79例)。结论 在mTOR信号通路相关蛋白中,仅P-S6K1在一定程度上可预测肺癌细胞株对雷帕霉素的敏感度,为一种mTOR靶向抑制剂———雷帕霉素治疗肺癌的差异蛋白。P-S6K1在小细胞肺癌中表达较非小细胞肺癌高,提示在P-S6K1表达率高的小细胞未分化肺癌中应用mTOR靶向抑制剂———雷帕霉素的疗效可能更佳。关键词:肺癌;雷帕霉素;mTOR

中图分类号:R734.2 文献标识码:A 文章编号:1000-8578(2011)10-1105-040 引言

哺乳动物雷帕霉素靶蛋白(mammalian targ

etof rapamycin,mTOR)可以整合氨基酸、能量、生长因子所激发的信号通路,参与基因转录、蛋白质翻译、核糖体生物合成和细胞凋亡等多项细胞功

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5011·肿瘤防治研究2011年第38卷第10期

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