Identification of differentially expressed genes related to radioresistance of human esophageal cancer cells  

作　　者：Hong-Zhen Li Xian-Shu Gao Wei Xiong Jing Zhao Hai Zhang De-Min Zhou 

机构地区：[1]Department of Radiation Oncology, Peking University First Hospital, Beijing 100034, P. R. China [2]School of Pharmaceutical Sciences, Peking University, Beijing 100038, P. R. China

出　　处：《Chinese Journal of Cancer》2010年第10期882-888,共7页

基　　金：National Natural Science Foundation of China (No.30670619)

摘　　要：Background and Objective: Radioresistant cells in esophageal cancer is one of the important reasons for the local failure of radiotherapy. In recent years, some researchers used gene chip technology to screen the differentially expressed genes between parental and radioresistant human esophageal cancer cells. But there were some problems in these studies, for example comparing cells at only one time interval, and genetic background not matching. In this study, we selected 3 different pairs of parental and radioresistant human esophageal cancer cells, and compared the gene expression profiles by cDNA microarray at 3 time intervals to identify and analyze the differentially expressed genes between parental and radioresistant human esophageal cancer cells. Methods: We compared the gene expression profiles between parental cells (TE13, Seg-1, Kyse170) and radioresistant cells (TE13R, Seg-1R, Kyse170R) before, and at 8 h and 24 h after irradiation with a cDNA microarray consisting of 48 000 genes (Human Genome). We identified differentially expressed genes by Pathway and GO analyses, and verified the differentially expressed genes LEF1 and CTNNB1 by RT-PCR. Results: A total of 460, 451, and 397 differentially expressed genes were found before, and at 8 h and 24 h after irradiation. After Pathway and GO analyses, 14 differentially expressed genes, participating in cell growth, apoptosis, cell cycle regulation, gene repair and signal transmission, were selected to further research. LEF1 and CTNNB1 were verified by RT-PCR, and the results were consistent with those of cDNA microarray. Conclusions: The WNT signal pathway may be an important pathway participating in the formation of radioresistance of esophageal cancer cells. LEF1 and CTNNB1 may be the important genes causing the esophageal cancer cell radioresistance.Background and Objective： Radioresistant cells in esophageal cancer is one of the important reasons for the local failure of radiotherapy. In recent years, some researchers used gene chip technology to screen the differentially expressed genes between parental and radioresistant human esophageal cancer cells. But there were some problems in these studies, for example comparing cells at only one time interval, and genetic background not matching. In this study, we selected 3 different pairs of parental and radioresistant human esophageal cancer cells, and compared the gene expression profiles by cDNA microarray at 3 time intervals to identify and analyze the differentially expressed genes between parental and radioresistant human esophageal cancer cells. Methods： We compared the gene expression profiles between parental cells （TEl3, Seg-1, Kyse170） and radioresistant cells （TE13R, Seg-lR, Kyse170R） before, and at 8 h and 24 h after irradiation with a cDNA microarray consisting of 48 000 genes （Human Genome）. We identified differentially expressed genes by Pathway and GO analyses, and verified the differentially expressed genes LEF1 and CTNNB1 by RT-PCR. Results： A total of 460, 451, and 397 differentially expressed genes were found before, and at 8 h and 24 h after irradiation. After Pathway and GO analyses, 14 differentially expressed genes, participating in cell growth, apoptosis, cell cycle regulation, gene repair and signal transmission, were selected to further research. LEF1 and CTNNB1 were verified by RT-PCR, and the results were consistent with those of cDNA microarray. Conclusions： The WNT signal pathway may be an important pathway participating in the formation of radioresistance of esophageal cancer cells. LEF1 and CTNNB1 may be the important genes causing the esophageal cancer cell radioresistance.

关 键 词：差异表达基因 食管癌细胞 人类基因组 抗辐射 Wnt信号通路 CDNA微阵列 基因芯片技术 PCR检测 

分 类 号：Q78[生物学—分子生物学] Q784