PRRX2通过调控Wnt/β-catenin信号通路促进胃癌细胞活力和迁移

目的:研究配对相关同源框2(paired-related homeobox 2,PRRX2)基因对胃癌细胞活力和迁移能力的影响,并分析其调控Wnt/β-catenin信号通路的机制。方法:通过生物信息学分析在线数据库中胃癌和正常胃组织的PRRX2表达水平及PRRX2在胃癌组织中的表达与胃癌患者总生存率的相关性;将PRRX2小干扰RNA(si RNA)和过表达质粒分别转染到胃癌细胞MGC-803和SGC-7901中,敲低和过表达PRRX2基因;MTT法和Transwell实验检测胃癌细胞的活力和迁移能力;Western blot和TOPflash/FOPflash双萤光素酶报告基因实验检测Wnt/β-catenin信号通路的活化情况;免疫共沉淀实验检测PRRX2与β-catenin蛋白的相互作用。结果:敲低PRRX2能够减弱胃癌细胞MGC-803的活力和迁移能力(P0.05)。过表达PRRX2能够增强胃癌细胞SGC-7901的活力和迁移能力(P0.05),增加β-catenin、c-Myc和cyclin D1的蛋白的表达水平(P0.05),增强TOPflash/FOPflash双萤光素酶报告基因活性(P0.05)。PRRX2与β-catenin蛋白存在相互作用。结论:PRRX2可促进胃癌细胞的活力和迁移,其机制可能与Wnt/β-catenin信号通路有关。

Promoting cell viability and migration of gastric cancer cells by PRRX2 via activation of Wnt/β-catenin signaling pathway

AIM: To study the effect of paired-related homeobox 2 (PRRX2) gene on the viability and migration ability of gastric cancer cells, and to analyze the underlying mechanism of regulating Wnt/β-catenin signaling pathway.METHODS: The expression of PRRX2 in gastric cancer and normal gastric tissue and the correlation between PRRX2 expression in gastric cancer tissues with the overall survival rate of gastric cancer patients were analyzed by bioinformatics. The small interfering RNA (siRNA) and over-expressed plasmids of PRRX2 were transfected into gastric cancer cells MGC-803 and SGC-7901, respectively. MTT assay and Transwell assay were used to detect the viability and migration ability of gastric cancer cells. Western blot and TOPflash/FOPflash dual-luciferase reporter gene assay were used to detect the activity of Wnt/β-catenin signaling pathway. Co-immunoprecipitation was used to detected the interaction between PRRX2 and β-catenin proteins.RESULTS: Knockdown of PRRX2 attenuated the viability and migration ability of gastric cancer cell line MGC-803 (P<0.05). Over-expression of PRRX2 enhanced the viability and migration ability of SGC-7901 cells (P<0.05), increased the protein levels of β-catenin, c-Myc and cyclin D1 (P<0.05) and the activity of TOPflash/FOPflash dual-luciferase reporter gene (P<0.05). PRRX2 interacted with β-catenin protein in gastric cancer cells.CONCLUSION: PRRX2 promotes the viability and migration ability of gastric cancer cells, which may be related to Wnt/β-catenin signaling pathway.