目的区分不同转移能力的鼻咽癌细胞亚群,对于探讨鼻咽癌转移的分子机制、脏器亲和性具有重要的临床和生物学意义。我们拟应用基因芯片技术来分析鼻咽癌细胞株5-8F-EGFP和肝转移亚群5-8F-H3B-EGFP的基因表达谱差异。方法分别提取鼻咽癌细胞株5-8F-EGFP和肝转移亚群5-8F-H3B-EGFP的总RNA,逆转录成荧光标记的cDNA,与Af-fymetrix Human Genome U_133A 2.0寡核苷酸芯片杂交(每株重复3次),用专业的软件和聚类分析法分析基因表达谱。结果得到差异表达基因3767个,其中差异表达2倍以上的基因281个,进一步筛选出16个可能与鼻咽癌肝转移关系密切的基因16个。结论这16个基因能够很好的区分5-8F-EGFP和肝转移亚群5-8F-H3B-EGFP,为进一步寻找鼻咽癌肝转移的临床分子标志物、判断预后缩小了范围。
The discovery of induced pluripotent stem cells (iPSCs) is a promising advancement in the field of regenerative medicine. Previous studies have indicated that the teratoma-forming propensity of iPSCs is variable; however, the relationship between tumorigenic potential and genomic instability in human iPSCs (HiPSCs) remains to be fully elucidated. Here, we evaluated the malignant potential of HiPSCs by using both colony formation assays and tumorigenicity tests. We demonstrated that HiPSCs formed tumorigenic colonies when grown in cancer cell culture medium and produced malignancies in immunodeficient mice. Furthermore, we analyzed genomic instability in HiPSCs using whole-genome copy number variation analysis and determined that the extent of genomic instability was related with both the cells′ propensity to form colonies and their potential for tumorigenesis. These findings indicate a risk for potential malignancy of HiPSCs derived from genomic instability and suggest that quality control tests, including comprehensive tumorigenicity assays and genomic integrity validation, should be rigorously executed before the clinical application of HiPSCs. In addition, HiPSCs should be generated through the use of combined factors or other approaches that decrease the likelihood of genomic instability.
Yi LiangHui ZhangQi-Sheng FengMan-Bo CaiWen DengDajiang QinJing-Ping YunGeorge Sai Wah TsaoTiebang KangMiguel Angel EstebanDuanqing PeiYi-Xin Zeng
