SOX2-OT/SOX2轴通过Gli1介导的上皮间质转化调控肺鳞癌H520细胞的迁移

SOX2-OT/SOX2 axis regulates lung cancer H520 cell migration via Gli1-mediated epithelial-mesenchymal transition

目的 探讨SOX2-OT在肺鳞癌细胞H520迁移能力调控中的作用并阐明其机制。方法 选用肺癌细胞株中SOX2-OT高表达的肺鳞癌细胞H520,敲低其SOX2-OT转录水平,通过细胞划痕实验和穿膜实验对细胞迁移能力进行检测,qRT-PCR和免疫印迹方法检测上皮间质转化(EMT)相关因子的表达。通过过表达Gli1进一步分析SOX2-OT的作用机制;用miR-200c抑制剂或类似物转染细胞,分析SOX2-OT对Gli的正向调控机制。结果 敲低SOX2-OT抑制了H520细胞的侵袭和迁移能力,同时伴随着细胞EMT表型的变化。SOX2-OT能够正向调控转录因子Gli1,Gli1过表达可逆转SOX2-OT敲低对细胞迁移能力的抑制作用。miR-200c抑制剂可有效逆转SOX2-OT敲低导致的SOX2下调。结论 SOX2-OT/SOX2轴通过Gli1介导的EMT过程来调控肺鳞癌细胞H520的迁移和侵袭能力。

Objective To explore the regulatory role of SOX2-OT in migration of lung squamous cell carcinoma H520 cells and the underlying mechanisms. Methods Wound-healing and Transwell migration assays were performed to examine the changes in migration and invasion capacity of lung squamous cell line H520, which expressed higher levels of SOX2-OT than other lung cancer cell lines, following RNA interference-mediated SOX2-OT knockdown. The transcription levels of epithelial-mesenchymal transition(EMT)-related components was detected by qRT-PCR and immunoblotting. Gli1 gain-of-function analysis was performed in H520 cells with SOX2-OT knockdown and the changes in EMT phenotype of the cells were examined. miR-200c mimic and inhibitor were used to analyze the mechanism by which SOX2-OT positively regulates Gli1 and the mediating role of SOX2.Results SOX2-OT knockdown significantly lowered the invasiveness and migration capacity of H520 cells and caused changes in EMT phenotype of the cells. Overexpression of Gli1, which was positively regulated by SOX2-OT, reversed the inhibitory effect of SOX2-OT knockdown on migration of H520 cells. Transfection of the cells with miR-200c inhibitor effectively reversed SOX2-OT knockdown-induced down-regulation of SOX2. Conclusion The SOX2-OT/SOX2 axis positively regulates migration of lung squamous H520 cells via Gli1-mediated EMT.