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中华放射肿瘤学杂志
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中华放射肿瘤学杂志  2021, Vol. 30 Issue (5): 509-513    DOI: 10.3760/cma.j.cn113030-20200714-00362
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干扰GTPBP4基因对食管癌EC9706细胞放射敏感性影响
张翠红1, 吕欣2, 范才1, 马博敬1, 张燚1, 张建军1
1解放军联勤保障部队第九八〇医院放疗科,石家庄 050082;
2邢台市柏乡县中心医院医务科 055450
Effect of GTPBP4 silencing on radiosensitivity of EC9706 cells
Zhang Cuihong1, Lyu Xin2, Fan Cai1, Ma Bojing1, Zhang Yi1, Zhang Jianjun1
1Department of Radiation Oncology, 980th Hospital of PLA Joint Logistics Support Force, Shijiazhuang 050082, China;
2Department of Medical Services, The Central Hospital of Baixiang County, Xingtai 055450, China
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摘要 目的 探讨沉默GTPBP4基因对人食管癌EC9706细胞系放射敏感性影响。方法 通过GEO数据库分析食管癌患者组织中GTPBP4的表达情况。利用重组质粒载体介导的RNA干扰(RNAi)技术转染食管癌EC9706细胞系,使细胞中GTPBP4基因沉默,观察GTPBP4基因沉默对EC9706细胞增殖、凋亡及放射敏感性影响。通过qRT-PCR和蛋白质印迹法评估基因沉默效果及检测凋亡相关蛋白表达。应用MTT法检测转染后细胞的增殖变化。采用流式细胞术检测干扰GTPBP4基因表达后细胞凋亡变化。应用克隆形成实验检测细胞照射后放射敏感性变化。结果 GEO数据库分析表明GTPBP4基因在人食管癌组织中的表达明显高于正常邻近食管组织(P<0.001)。与空白对照组和阴性对照组相比,干扰组EC9706细胞的GTPBP4 mRNA及蛋白表达水平明显下降(均 P<0.001),表明质粒成功转染EC9706细胞。MTT检测结果显示干扰组EC9706细胞增殖率受到显著抑制(P<0.001)。流式细胞术结果显示干扰组EC9706细胞凋亡率明显升高(P<0.001),细胞凋亡明显增加(P<0.001);凋亡相关蛋白(Cleaved caspase-9、Cleaved caspase-3、Bax)表达明显升高,抗凋亡蛋白(Bcl-2)表达下降(P<0.001、P=0.001、P=0.0014、P=0.005)。克隆形成实验结果显示干扰组EC9706细胞放射增敏比1.716。结论 GTPBP4基因在人食管癌组织中高表达,RNAi技术可有效抑制EC9706细胞GTPBP4基因表达,从而抑制细胞增殖、诱导细胞凋亡、增强细胞对放射线的敏感性。
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张翠红
吕欣
范才
马博敬
张燚
张建军
关键词 GTPBP4基因RNA干扰放射敏感性EC9706细胞系    
AbstractObjective To investigate the effect of GTPBP4 silencing by RNA interference on the radiosensitivity of esphageal cancer EC9706 cells line. Methods The expression data of GTPBP4 in esophageal cancer tissues was obtained from public Gene Expression Omnibus (GEO) database. Recombinant plasmid-mediated RNA interference (RNAi) was employed to transfect the esophageal cancer EC9706 cell to evaluate the influence of GTPBP4 silencing on the proliferation, apoptosis and radiosensitivity of esphageal cancer EC9706 cells. The expression levels of GTPBP4 mRNA and protein and apoptosis-associated proteins of Bax,cleaved caspase-9,cleaved caspase-3 and Bcl-2 were determined by qRT-PCR and Western blot. The cell proliferation was determined by MTT assay. The changes in cell apoptosis were detected AnnexinⅤ-FITC/PI double staining flow cytometry. The variations in radiosensitivity after radiation exposure were assessed by clone formation assay. Results The expression level of GTPBP4 in the esophageal cancer tissues was significantly higher than that in the normal adjacent esophageal tissues (P<0.001). qRT-PCR and Western blot demonstrated that the expression levels of GTPBP4 mRNA and protein in the GTPBP4-siRNA group were significantly lower than those in the blank and negative control groups (both P<0.001), suggesting that the plasmid was successfully transfected into the EC9706 cells. MTT assay indicated that the EC9706 cell proliferation rate was significantly inhibited (P<0.001). Flow cytometry found that the apoptosis rate was significantly increased in the GTPBP4-siRNA group (P<0.001). After GTPBP4 gene interference combined with radiotherapy, the cell sensitivity enhancement ratio was 1.716. The apoptosis rate of EC9706 cells was significantly increased in the GTPBP4-siRNA group (P<0.001). The expression levels of apoptosis-associated proteins including cleaved caspase-9, cleaved caspase-3 and Bax were significantly up-regulated, whereas that of Bcl-2 was significantly down-regulated in the EC9706 cells in the GTPBP4-siRNA group (P<0.001, P=0.001, P=0.001 and P=0.005). Conclusions GTPBP4 gene is highly expressed in human esophageal cancer tissues. RNAi technology can effectively inhibit the expression of GTPBP4 gene in the EC9706 cells, thereby suppressing cell proliferation, inducing cell apoptosis and enhancing the radiosensitivity of cells.
Key wordsGTPBP4 gene    RNA interference    Radiosensitivity    EC9706 cell line   
收稿日期: 2020-07-14     
通讯作者: 张建军,Email:3590213177@qq.com   
引用本文:   
张翠红,吕欣,范才等. 干扰GTPBP4基因对食管癌EC9706细胞放射敏感性影响[J]. 中华放射肿瘤学杂志, 2021, 30(5): 509-513.
Zhang Cuihong,Lyu Xin,Fan Cai et al. Effect of GTPBP4 silencing on radiosensitivity of EC9706 cells[J]. Chinese Journal of Radiation Oncology, 2021, 30(5): 509-513.
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