SEPT7对胶质瘤细胞系TJ905生物学特性的影响

Influence of SEPT7 on biological characters of glioma cell line TJ905

目的研究 SEPT7对胶质瘤细胞系 TJ905的生物学特性的影响。方法 SEF17表达缺失的人脑胶质瘤细胞系 TJ905转染 SEFF7构建体,pcDNA3载体转染组为空载对照,应用蛋白印迹鉴定转染是否成功。采用 MTF 法检测转染 SEPT7构建体的细胞增殖活性,流式细胞术分析细胞周期分布变化,Annexin V 法评价细胞的凋亡,Martrigel 三维立体培养法分析侵袭能力。结果转染SEPT7后,胶质瘤细胞增殖活性降低,细胞周期分析结果为 S 期细胞比例(SPF)降低、G0/G1期阻滞;蛋白印迹检测细胞周期因子显示正向调节因子 cyclin D1、cyclin E、CDk2、CDk4表达下降,负向调节因子 p21、p16表达升高,肿瘤细胞侵袭能力明显受到抑制,并可诱发细胞凋亡。结论 SEPT7转染人胶质瘤细胞系 TJ905,可使细胞 SPF 降低、G0/G1期出现阻滞、抑制细胞侵袭和增殖、促进凋亡。

Objective To investigate the influence of SEPT7 on biological characters of gliomas cells TJ905. Methods Recombinant SEPT7 constructs was transfected to human glioblastoma cell line TJ905 in which SEPT7 expression is absent. The positive clones were identified by RT-PCR and Western blot analysis. The cell proliferation was determined by MTT assay and tlowcytometry, cell apoptosis was detected with Annexin V staining and cell invasion was evaluated by motility in three-dimensional culture. Moreover, the molecules regulating the cell cycle progression were examined by immunofluorence staining and Western blot analysis. Results When SEPT7 was successfully transfected to TJ905 cells, the cell proliferation activity of TJ905 cell was inhibited, the cell cycle was arrested in G0/G1 phase and S phase fraction （SPF） was lowered, the positive regulatory molecules for cell cycle progression including cyclin D1, CDk4, cyclin E and CDk2 were downregulated while the negative modulators including p16 and p21 were upregulated, apoptotic cells were increased and cell invasive ability was attenuated. Conclusions Transfection of SEPT7 construct into the glioma cells TJ905 is able to inhibit the proliferation acivity and invasive ability of TJ905 cell and to induce cell apoptosis. These results revealed that SEPT7 exerted the suppressive effect on the glioma cell growth and invasion, and induced apoptosis, and suggested that SEPT7 as a gene of glioma suppressor.