GBX2过表达促进人宫颈癌SiHa细胞增殖、迁移及侵袭

GBX2 over-expression promotes proliferation, migration and invasion of human cervical carcinoma SiHa cells

目的:探讨GBX2基因在人宫颈癌SiHa细胞增殖和侵袭转移中的作用及其机制。方法:应用质粒转染技术,分别将过表达GBX2基因重组质粒pCMV6-entry-GBX2(实验组)及空载体质粒pCMV6-entry(阴性对照组)转染到宫颈癌SiHa细胞中,用WST-1法、集落形成实验、流式细胞术分别检测转染细胞的增殖、集落形成和细胞周期,用划痕愈合实验、Transwell实验检测细胞的迁移、侵袭能力,用ELISA法检测细胞培养上清中IL-6的表达水平,用WB检测EMT相关蛋白的表达变化并探讨其可能的作用机制。结果:与SiHa/pCMV6组相比,上调GBX2表达后:(1)SiHa/GBX2组细胞的增殖、集落形成、迁移和侵袭能力明显增强(均P<0.01),G0/G1期的细胞比例减少、S期与G2/M期的细胞比例增加(均P<0.01)(;2)SiHa/GBX2组细胞EMT相关蛋白上皮钙黏蛋白表达水平下降,神经钙黏蛋白、波形蛋白和snail表达水平上调(均P<0.01)(;3)SiHa/GBX2组细胞培养上清中IL-6的表达水平明显增高(P<0.01);(4)SiHa/GBX2组细胞STAT3磷酸化水平增强,并能被STAT3抑制剂S31-201抑制(P<0.01)。结论:GBX2可能通过IL-6/STAT3通路诱导宫颈癌SiHa细胞EMT,从而促进宫颈癌细胞的增殖、迁移和侵袭能力。

Objective: To investigate the effects of GBX2 gene on the proliferation, migration and invasion of human cervical carcinoma SiHa cells and to explore the mechanism. Methods: Recombinant plasmid over-expressing GBX2 gene(pCMV6-entry-GBX2,experimental group) and empty vector plasmid(pCMV6-entry, negative control group) were transfected into cervical cancer SiHa cells by plasmid transfection technique. The proliferation, colony formation and cell cycle of transfected cells were detected by WST-1 method, Colony formation assay and flow cytometry, respectively. The cell migration and invasion were detected by wound healing assay and Transwell assay. The expression level of IL-6 in cell culture supernatant was detected by ELISA. WB was used to detect the expression changes of EMT-related proteins and to explore its possible mechanism. Results: Compared with the SiHa/pCMV6 negative control group, after up-regulation of GBX2,(1) the proliferation, colony formation, migration and invasion of SiHa/GBX2 cells in the experimental group were significantly enhanced(all P<0.01);The proportion of cells in G0/G1 phase decreased while the proportion of cells in S phase and G2/M phase increased(all P<0.01);(2) the expression of E-cadherin decreased, and the expressions of N-cadherin, vimentin and snail increased(all P<0.01);(3) the expression of IL-6 in the culture supernatant of SiHa/GBX2 cells was significantly up-regulated(P<0.01);(4) STAT3 phosphorylation in SiHa/GBX2 cells was enhanced, and could be inhibited by STAT3 inhibitor S31-201(P<0.01). Conclusion: GBX2 may induce EMT of cervical cancer SiHa cells through IL-6/STAT3 pathway, thereby promoting the proliferation, migration and invasion of cervical cancer cells.