目的：探究SRY相关的高迁移率族盒9（SOX9）通过Wnt/β-连环蛋白（β-catenin）途径促进非小细胞肺癌（NSCLC）A549 细胞上皮-间充质转化（EMT）的机制。方法：将A549 细胞分为OE-NC组、OE-SOX9 组、OE-SOX9+XAV-939 组。其中OESOX9组通过转染SOX9 pcDNA质粒上调SOX9 的表达水平；OE-SOX9+XAV-939 组在转染SOX9 pcDNA质粒的同时在培养基中加入β-catenin 抑制剂XAV-939（1.0 μmol/L）。用qPCR检测SOX9 mRNA表达水平，CCK-8 法检测A549 细胞增殖能力，划痕愈合实验检测A549 细胞迁移能力，Transwell 小室实验检测A549 细胞的侵袭能力，WB实验检测SOX9、β-catenin、E-钙粘蛋白（E-cadherin）、γ-连环蛋白（γ-catenin）、N-钙黏蛋白（N-cadherin）、波形蛋白（vimentin）表达水平。结果：转染后OE-SOX9 组和OE-SOX9+XAV-939 组的SOX9 mRNA和蛋白的水平显著高于OE-NC 组（均P<0.05），且OE-SOX9 组和OE-SOX9+XAV-939 组比较无显著差异（P>0.05）。OE-SOX9 组细胞增殖、侵袭和迁移能力显著高于OE-NC组，而OE-SOX9+XAV-939 组显著低于OE-SOX9 组（均P<0.05）。OE-SOX9 组β-catenin 蛋白水平显著高于OE-NC 组，而OE-SOX9+XAV-939 组β-catenin 蛋白的水平低于OE-SOX9 组（均P<0.05）。与OE-NC组比较，OE-SOX9 组的上皮细胞表型标志物E-cadherin、γ-catenin 水平下调并且间充质细胞表型标志物N-cadherin、vimentin 上调，而OE-SOX9+XAV-939 组E-cadherin、γ-catenin 高于OE-SOX9 组，且N-cadherin、vimentin 低于OE-SOX9组（均P<0.05）。结论：SOX9 可通过激活Wnt/β-catenin通路促进NSCLC A549 细胞的增殖、迁移和EMT。

Objective:To explore the mechanism by which SRY-related high mobility group-box 9 (SOX9) promotes the epithelial mesenchymal transition (EMT) of non-small cell lung cancer (NSCLC) A549 cells via the Wnt/β-catenin pathway. Methods: The human NSCLC A549 cell line was divided into three groups: OE-NC group, OE-SOX9 group and OE-SOX9+XAV-939 group. The cells in OESOX9 group were transfected with SOX9 pcDNA plasmid to up-regulate the expression level of SOX9; The cells in OE-SOX9+XAV-939 group were transfected with SOX9 pcDNA plasmid while the β-catenin inhibitor XAV-939 (1.0 μmol/L) was added to the medium.qPCR was used to detect SOX9 mRNA levels; CCK-8 was used to examine the proliferation of A549 cells; Wound-healing assay and Transwell chamber assay were used to detect the migration and invasion of A549 cells, respectively; and WB was used to detect protein expressions of SOX9, β-catenin, E-cadherin, γ-catenin, N-cadherin and vimentin. Results: The mRNA and protein levels of SOX9 in OE-SOX9 group and OE-SOX9+XAV-939 group were significantly higher than those in the OE-NC group after transfection (all P<0.05), while there was no significant difference between the OE-SOX9 group and the OE-SOX9+XAV-939 group (P>0.05). The proliferation,migration and invasion of cells in OE-SOX9 group were significantly higher than those in OE-NC group; however, those abilities in OE-SOX9+XAV-939 group were significantly lower than those in OE-SOX9 group (all P<0.05). The level of β-catenin protein in OE-SOX9 group was significantly higher than that in the OE-NC group, while the level of β-catenin protein in OE-SOX9+XAV-939 group was lower than that in OE-SOX9 group (all P<0.05). Compared with the OE-NC group, the levels of phenotypic markers of epithelial cells, E-cadherin and γ-catenin, were down-regulated, and the phenotypic markers of mesenchymal cells, N-cadherin and vimen‐tin, were up-regulated in cells of OE-SOX9 group; however, E-cadherin and γ-catenin were higher, and N-cadherin and vimentin were lower in OE-SOX9+XAV-939 group than those in OE-SOX9 group (all P<0.05). Conclusion: SOX9 could promote proliferation, migration and EMT of NSCLC A549 cells by activating the Wnt/β-catenin pathway.