靶向干扰GPx1基因对人胶质母细胞瘤细胞生长和迁移的影响

Effects of targeting interference of GPx1 gene expression on growth and migration of glioblastoma multiforme cells

目的:探讨靶向上调和下调谷胱甘肽过氧化物酶1(GPx1)对人胶质母细胞瘤细胞株(U87MG、U118MG)增殖、迁移和侵袭能力的影响。方法:合成针对GPx1的siRNA和构建、鉴定pc DNA3.1-GPx1重组质粒,分别用LipofectamineTM2000脂质体瞬时转染人胶质母细胞瘤细胞株U87MG和U118MG。Real-time PCR检测U87MG和U118MG中GPx1 mRNA表达。Western blotting法检测转染后GPx1蛋白表达,用MTS检测法和Transwell实验分别检测转染后细胞的活力、迁移及侵袭能力的变化。结果:siRNA干扰U87MG细胞后在24 h、48 h和72 h对细胞活力的抑制率分别为25.9%、35.7%和34.8%,较对照组明显降低(P<0.05);质粒转染U118MG细胞后在24 h、48 h和72 h对细胞活力的促进率分别为22.7%、45.8%和39.8%,较对照组明显增加(P<0.05);Transwell结果显示经siRNA干扰,U87MG细胞迁移抑制率为41.6%±8.2%,细胞侵袭抑制率为40.4%±10.1%,经siRNA干扰的细胞迁移和侵袭能力明显下降(P<0.05);质粒转染后细胞迁移促进率为55.8%±9.8%,细胞侵袭促进率为60.8%±9.2%,经质粒转染的细胞的迁移和侵袭能力显著增强(P<0.05)。结论:siRNA下调GPx1表达可抑制人胶质母细胞瘤细胞株U87MG的生长、迁移和侵袭;相反,质粒上调GPx1表达可促进人胶质母细胞瘤细胞株U118MG的生长、迁移和侵袭。

AIM： To verify the role of enhancing or suppressing the expression of glutathione peroxidase 1 （GPx1） in the growth, migration and invasion of glioblastoma multiforme cell lines U87MG and U118MG.METHODS：U87MG and U118MG cell lines were transfected with the vector containing specific siRNA or pcDNA3.1 recombinant plas-mid both targeting GPx1.The mRNA and protein expression levels of GPx1 were detected by real-time PCR and Western blotting.MTS assay was applied for determining the cell activity.The abilities of migration and invasion were examined by Transwell assay.RESULTS：Compared with blank control group and negative group, the inhibitory rate of the cell activity in U87MG cells in siRNA group was significantly reduced by 25.9%, 35.7%and 34.8%at 24 h, 48 h and 72 h, respec-tively （P〈0.05）.In contrast, the cell activity of U118MG cells in pcDNA3.1-GPx1 group was significantly increased by 22.7%, 45.8%and 39.8%at 24 h, 48 h and 72 h, respectively （ P〈0.05） .In siRNA group, the inhibitory rate of mi-gration in U87MG cells was 41.6%±8.2%and the invasion was 41.6%±8.2%compared with blank control group and negative group （P〈0.05）.The cell migration and invasion rates of the U118MG cells in pcDNA-GPx1 group were in-creased by 55.8%±9.8% and 60.8% ±9.2%, respectively, compared with blank control group and negative group＆nbsp;（P〈0.05）.CONCLUSION：The down-regulation of GPx1 by specific siRNA reduces the capability of cell growth, mi-gration and invasion of U87MG cells, while up-regulation of GPx1 by pcDNA3.1-GPx1 increases the capability of cell growth, migration and invasion of U118MG cells.