摘要
目的 从两株人肺巨细胞癌细胞株中分离并鉴定人肺癌转移相关基因 ,为探讨肿瘤转移的分子机制奠定基础。方法 以细胞系PLA 80 1的两个具有不同转移潜力的亚克隆为模型 ,利用抑制消减杂交(suppressionsubtractivehybridization ,SSH)技术克隆差异片段 ,对得到的片段经基因芯片筛选后测序并与GenBank数据库进行同源性比较 ,然后用Northern杂交和RT PCR对其中的两条序列进行验证 ,并进行详细的生物信息学分析。结果 获得了 79条在高转移细胞中高表达而在低转移细胞中低表达的序列 ,在与这些序列同源的己知基因中包括两条功能未知的全长cDNA序列BC0 0 62 3 6和BC0 0 2 42 0 ,分别命名为MAG 1和MAG 2。MAG 1定位于 4q2 1,由 4个外显子组成 ,MAG 2定位于 2 q3 5 ,由 9个外显子组成 ,基因长度分别为8.5kb和 5 .2kb。二条序列均有开放阅读框架 (ORF) ,编码产物以α螺旋为主并含有部分片层结构和无规卷曲。结论 MAG 1和MAG 2在高低转移性肺巨细胞癌细胞株中的表达具有显著差异 ,二者的表达与高转移潜能具有相关性 ,提示MAG 1和MAG 2可能参与肿瘤转移过程。
Objective To isolate and identify the genes related to cancer metastasis by comparison of two cell strains with different metastasis potentials subcloned from human lung giant cell carcinoma cell line. Methods Suppression subtractive hybridization (SSH) was used to compare the levels of gene expression between the two cell strains and SSH library was constructed. After screening the library by gene chip, the expressed sequence tags (ESTs) with different expressing level were sequenced and blasted with GenBank. Results Seventy-nine genes were obtained that were expressed much higher in PLA-801D than in PLA-801C, including two full-length cDNA. GenBank Accession numbers of the two cDNA, named MAG-1 and MAG-2, were BC006236 and BC002420, the 8.5 kb MAG-1 gene was composed of four exons and located on the chromosome of 4q21. The MAG-2 gene, which was made up by 9 exons, had a length of 5.2 kb and its location was 2q35. Both sequences had open reading frames (ORF) and promoters before the theoretical transcription start points. Using special software, the secondary structure of theoretical products of the two cDNAs was prognosticated, α-helix was the main proportion, but β-pleated sheet and random coil were also included. Conclusion The expression of MAG-1 and MAG-2 has significant differences in these two cell strains, so they might impact tumor metastasis in some ways that are still uncharted.
出处
《中国肺癌杂志》
CAS
2003年第6期460-463,共4页
Chinese Journal of Lung Cancer
基金
国家自然基金 (No.30 2 71 4 52 )
" 973"计划 (No.2 0 0 2CB51 31 0 5)资助~~
关键词
肿瘤
基因
克隆
肺癌
抑制消减杂交技术
SSH
Lung neoplasms Tumor metastasis Metastatic potential Suppression subtractive hybridization Gene chip
