摘要
目的:检测肿瘤坏死因子(TNF-α)对乳腺癌细胞株MDA-MB-231中CD44s、CD44V3和CD44V6表达的调控及其对细胞迁徙力的影响,并探讨TNF-α调节CD44可能存在的信号途径。方法:用RT-PCR和蛋白质印迹法检测TNF-α(0、2、20和200ng/mL)作用乳腺癌细胞后其CD44mRNA和蛋白的表达情况,Transwell方法检测TNF-α作用后细胞迁徙能力的改变;以浓度为20ng/mL的TNF-α处理MCF-7和MDA-MB-231后,用蛋白质印迹法检测MAPK(JNK、p38和ERK)信号通路中蛋白磷酸化水平变化,对磷酸化水平增加的蛋白用特异性抑制剂预处理后检测CD44的表达及细胞迁徙能力的改变。结果:TNF-α作用后MDA-MB-231细胞CD44s、CD44V3、CD44V6mRNA和蛋白表达水平均上调;迁徙力增加了22%～90%;TNF-α作用MDA-MB-231细胞后p38磷酸化水平升高;用p38的特异性抑制剂预处理后可以逆转CD44表达和细胞迁徙力的改变。结论:TNF-α通过p38途径对MDA-MB-231细胞CD44表达进行调控,CD44的表达可以增强肿瘤细胞的迁徙力。
OBJECTIVE：To detect CD44s,CD44V3 and CD44V6 expression in breast cancer cell line MDA-MB-231 treated with TNF-α and the effect on cell migration,and investigate the possible pathways via which TNF-α induces CD44 expression in MDA-MB-231 cell.METHODS：CD44 mRNA was detected by RT-PCR,and CD44 protein expression was detected by Western blot assay after treated with TNF-α （0,2,20 and 200 ng/mL）.Transwell was used for detecting the migration of cells in vitro.MDA-MB-231 cell was treated with TNF-α （20 ng/mL） for 24 h.Western blot was used for detecting the phosphorylation of MAPK pathway proteins （JNK,p38,ERK）.The CD44 expression and the migration of cells in vitro were detected after pre-treatment with the specific inhibitors of activated phosphorylation protein.RESULTS：TNF-α treatment increased the levels of CD44s,CD44V3 and CD44V6 mRNAs and proteins in MDA-MB-231 cells.The migration of MDA-MB-231 cells increased by 22%-90%.When treated with TNF-α,p38 phosphorylation of MDA-MB-231 cells increased.Both of CD44 expression and cell migration induced by TNF-α were reduced after the pre-treatment with paired specific inhibitors.CONCLUSIONS：TNF-α regulates the CD44 expression via p38 pathway in MDA-MB-231 cell.CD44 premotes BC cells migration.
出处
《中华肿瘤防治杂志》
CAS
2010年第8期566-570,共5页
Chinese Journal of Cancer Prevention and Treatment
基金
国家自然科学基金面上项目[30772474(BA07)]
江苏省科技厅基础研究计划(自然科学基金BK2008477)
人事部留学回国人员基金2009(IA09)
江苏省卫生厅开放课题(XK18200904)
