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目的:探讨DDX3表达上调在人宫颈癌细胞增殖中的作用。方法:采用免疫组织化学方法检测2012年4月至2013年3月河南省人民医院59例宫颈癌组织及癌旁非肿瘤组织标本中的DDX3表达情况。同时，以宫颈癌细胞HeLa为研究对象，通过慢病毒介导的宫颈癌细胞过度表达来检测DDX3的功能。采用细胞增殖与活性检测试剂盒评估细胞存活率，Boyden室进行迁移和侵袭测定，即时荧光定量聚合酶链反应检测DDX3 mRNA表达水平，Western blot检测细胞中上皮间质转化（EMT）和PI3K/Akt信号通路相关蛋白表达。结果:DDX3过表达与国际妇产科联盟（FIGO）分期、宫颈浸润深度和淋巴结转移呈正相关（n P<0.05）。Kaplan-Meier分析显示，DDX3高表达的宫颈癌患者具有较差的总体生存率（n P<0.05）。与慢病毒载体对照（pLVX-Con）组相比，在shRNA-DDX3慢病毒（pLVX-DDX3）转染组中检测到DDX3的蛋白表达和mRNA表达均明显增加（均n P<0.01）。在pLVX-DDX3转染第72小时的HeLa细胞存活数目显著高于pLVX-Con转染细胞（n P<0.05）。与pLVX-Con转染的细胞相比，DDX3过表达显著促进了HeLa细胞的迁移和侵袭（n P<0.05），并且显著上调了HeLa细胞的N-Cadherin、波形蛋白和Snail的表达（n P<0.05）。在pLVX-DDX3组中，Akt及其下游靶基因p-GSK3β的磷酸化水平和β-catenin表达较pLVX-Con组显著升高（n P<0.05），而当向pLVX-DDX3组加入PI3K抑制剂LY294002后，p-Akt、p-GSK3β和β-catenin明显降低（n P<0.05），并且N-Cadherin、波形蛋白和Snail的水平表达下调（n P<0.05）。n 结论:DDX3过表达促进宫颈癌细胞的增殖、迁移和侵袭，并能诱导EMT，其作用机制可能与激活PI3K/Akt信号通路有关。“,”Objective:To investigate the role of DDX3 up-regulation in the proliferation of human cervical cancer cells and its correlation with clinical prognosis.Methods:Expression levels of DDX3 in the 59 specimens of cervical cancer and adjacent non-neoplastic tissue collected at Henan Provincial People′s Hospitaln from April 2012 to March 2013 were detected using immunohistochemistry. A lentivirus-mediated DDX3-over-expression cell line was constructed based on HeLa cells of cervical cancer. CCK-8 assay was used to evaluate cell survival rate. Boyden chamber was used to measure the cell migration and invasion. Real-time fluorescence quantitative PCR was used to detect DDX3 expression level and Western blot was used to detect the expression of EMT and PI3K/Akt signal pathway-related proteins.n Results:DDX3 overexpression was associated with FIGO stage, depth of cervical invasion and lymph node metastasis (n P<0.05). Kaplan-Meier analysis revealed that cervical cancer patients with high expression of DDX3 had a poor overall survival (n P<0.05). Compared with the cells transfected with pLVX-Con vector, the expression of DDX3 protein and mRNA was significantly increased in the cells transfected with pLVX-DDX3 (alln P<0.01). Cell proliferation was significantly increased following transfection with pLVX-DDX3 for 72 h in HeLa cells compared with that transfected with pLVX-Con (n P<0.05). Compared with the controls, DDX3 overexpression significantly promoted the migration and invasion of HeLa cells (n P<0.05), and increased the expression of N-Cadherin, vimentin and Snail in HeLa cells (n P<0.05). In pLVX-DDX3 group, the expression levels of β-catenin, phosphorylated Akt, and pAkt′s downstream target p-GSK3β were significantly higher than those of pLVX-Con group (n P<0.05). The expression levels of p-Akt, p-GSK3β and β-catenin were decreased when the PI3K/Akt pathway was blocked using the PI3K inhibitor LY294002 (n P<0.05), and the expression levels of N-Cadherin, vimentin and Snail were also significantly decreased (n P<0.05).n Conclusions:DDX3 overexpression promotes proliferation, migration and invasion of cervical cancer cells, and induces epithelial-mesenchymal transition (EMT). Its mechanism may be related to activation of the PI3K/Akt signaling pathway.