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口腔鳞癌细胞中ITGB6基因主要转录调控区域的定位分析

陈锡和1,2,邓小玲3,*,尹丽琴2,傅玉才2,许铭炎1,*   

  1. ( 1. 汕头大学医学院第二附属医院口腔科,广东 汕头 515041;2.汕头大学医学院细胞衰老实验室,广东 汕头 515041;3. 汕头大学医学院细胞生物与遗传学教研室,广东 汕头 515041 )
  • 收稿日期:2012-12-20 修回日期:2013-04-07 出版日期:2013-05-30 发布日期:2013-05-30
  • 通讯作者: 邓小玲,E-mail:caseydxl@ yahoo.com;许铭炎,E-mail: myxu@stu.edu.cn
  • 作者简介:陈锡和 (1986- ),男,广东省江门市人,硕士研究生,研究方向:基因转录调控与表观遗传学。
  • 基金资助:

    国家自然科学基金项目 (30900661,81072208),教育部留学回国人员科研启动基金,汕头大学医学院基础与临床科研基金项目

Site-directed analysis of key transcriptionaI regulatory regions of ITGB6 gene in oral squamous cell carcinoma cells

CHEN Xi-he1,2,DENG Xiao-ling3,*,YIN Li-qin2,FU Yu-cai2,XU Ming-yan1,*   

  1. (1. Department of Stomatology, the Second Affiliated Hospital of Shantou University Medical College, Shantou 515041; 2. Laboratory of Cellular Senescence, Shantou University Medical College, Shantou 515041; 3. Department of Cell Biology and Genetics, Shantou University Medical College, Shantou 515041, Guangdong, China)
  • Received:2012-12-20 Revised:2013-04-07 Online:2013-05-30 Published:2013-05-30
  • Contact: DENG Xiao-ling,E-mail:caseydxl@ yahoo.com;XU Ming-yan,E-mail: myxu@stu.edu.cn

摘要:

目的: 鉴定ITGB6基因在口腔鳞癌细胞中的主要调控区域,为研究ITGB6基因在口腔鳞癌细胞中的转录调控机制奠定基础。方法:构建含有ITGB6基因转录起始点上游5' 端侧翼区不同长度DNA序列的重组pGL2荧光素酶报告基因质粒,转染口腔鳞癌细胞株TCA8113和SAS,利用双荧光素酶报告基因系统检测启动子转录活性,并通过生物信息学方法预测ITGB6基因中潜在的主要转录因子结合位点。结果:获得一系列不同长度ITGB6基因5' 侧翼区序列的重组荧光素酶报告基因质粒;当ITGB6基因5' 端侧翼片段截短到-187~-35和-35~+27之间时,启动子活性均显著下降;生物信息学分析显示,在-187~-35区域有2个Ets-1的潜在结合位点,而在-35~+27区域有1个IRF-4潜在结合位点。结论:在口腔鳞癌细胞中,ITGB6基因-187~-35和-35~+27区域是主要的转录因子结合区。

关键词: 口腔鳞癌, ITGB6基因, 主要调控区, 转录因子, 荧光素酶报告基因分析

Abstract:

OBJECTIVE: To identify the key transcriptional regulatory regions in oral squamous cell carcinoma (OSCC) cell lines,and lays the groundwork for investigating the mechanism of ITGB6 transcriptional regulation in OSCC. METHODS:The recombinant pGL2 luciferase reporter constructs containing different lengths of 5' -flanking DNA fragments upstream of transcription initiation site of ITGB6 gene were constructed,and were transfected into two OSCC cell lines TCA8113 and SAS. The promoter activities were detected using dual-luciferase reporter assay system and the potential transcription factor binding sites at key transcriptional regulatory region of ITGB6 gene were predicted by bioinformatics method. RESULTS:The recombinant reporter constructs containing different lengths of 5' -flanking region of ITGB6 gene were obtained. When the length of ITGB6 5' -flanking region was reduced from -187 to -35 and -35 to +27,the transcriptional activity decreased significantly. Two potential Ets-1 binding sites and one potential IRF-4 binding site were identified in the region of -187 to +27 of ITGB6 gene. CONCLUSION:The -187/-35 and -35/+27 regions are the two key transcriptional regulatory regions of ITGB6 gene in OSCC cell lines.

Key words: oral squamous cell carcinoma, ITGB6, key regions, transcription factor, luciferase reporter assay