中文摘要
肝癌的发病率在全球常见肿瘤中的排第5位,致死率列全球高致死性肿瘤第3位,是一种严重威胁人类健康的重要疾病。本研究旨在利用已经成功构建的斑马鱼肝癌模型,通过转录组测序和比较转录组法分析患肝癌斑马鱼与野生型斑马鱼肝脏差异表达基因,筛选出斑马鱼肝脏肿瘤发生与发展相关的重要功能基因,并利用TALEN 和CRISPR/Cas9等基因敲除技术对目标基因进行功能鉴定。同时,利用基于体外标记的定量蛋白质组技术,并结合磷酸化蛋白富集技术的策略,鉴定得到斑马鱼肝脏肿瘤发生和发展相关的功能蛋白分子群和信号分子,在生物信息学分析和蛋白功能研究的基础上,来构建斑马鱼肝脏肿瘤发生和发展相关的蛋白相互作用和信号转导通路网络,并从细胞整体水平做动态的全局的研究。本项研究将有助于阐明肝脏肿瘤发生和发展的分子机制, 对于寻找新药靶标,研制和筛选新的肝脏肿瘤治疗药物具有重要意义。
英文摘要
Hepatocellular carcinoma (HCC) ranks as the fifth most prevalent malignancy and the third leading cause of cancer mortalities worldwide. It is one of the deadliest diseases in China. In this study, based on a transgenic zebrafish model constitutively expressing the Nras oncogene in the liver which was previously generated by our laboratory, we plan to perform high-throughput transcriptome assembly and analysis the liver samples both of the liver cancer model zebrafish and wild type zebrafish to identify a series of genes involved in the liver tumorigenesis and development. Through the gene editing technologies (Transcription activator-like effector nuclease, (TALEN); Clustered Regularly Interspaced Short Palindromic Repeats RNA/ CRISPR-associated genes, (CRISPR/Cas)) to demonstrate the biological function of the screened key genes. And employ a SILAC (stable isotope labeling by amino acids in cell culture)-based quantitative proteomic strategy to systematically study processes and signaling pathways responsible for Nras-driven liver tumorigenesis. This study will offer useful information for a complete understanding of the molecular mechanisms of liver tumorigenesis and development and identifying new therapeutic targets.
结题摘要
原发性肝癌(primary liver cancer, PLC)是常见的恶性肿瘤,其发病率在全球常见肿瘤中的排第5位,致死率列全球高致死性肿瘤第3位。而肝内胆管细胞癌(intrahepatic cholangiocarcinoma,ICC)是原发性肝癌中的第2大种类,难以早期诊断,在我国,ICC是一种高致死率的癌症。本项目利用已经成功构建的斑马鱼肝内胆管细胞癌模型, 通过对患癌斑马鱼及野生型斑马鱼进行了转录组测序比较分析。结果发现,和野生型斑马鱼的肝脏转录组数据相比较。患癌斑马鱼的肝脏转录组有分别有1214个及661个明显表达上调及下调的基因。同时,通过对患癌斑马鱼及野生型斑马鱼的肝脏进行甲基化组数据分析,结果发现,当甲基化水平上调(CG上调)时,在转录水平上分别有72个及44个明显表达上调及下调的基因;反之,则分别有406个及182个明显表达上调及下调的基因。另外,我们初步筛选得到了11个潜在的ICC的标志基因,并且其中有6个出现了甲基化水平下调。该成果为未来研究人类肝癌的分子机制及药物筛选提供了研究平台,相关工作目前已经整理了一篇SCI文章,正在准备投稿。
