人Jagged-1蛋白在真核细胞中的表达及稳定株的建立

Jagged-1蛋白属于Notch信号通路的配体之一,而Notch信号通路是介导细胞和细胞之间接触的主要信号通路之一,在造血微环境中调节造血细胞增殖与分化的过程中起重要作用。为研究Notch信号通路中受体与配体结合后的生物学功能及Notch信号通路在骨髓基质细胞影响细胞耐药的作用机制,构建过表达Jagged-1蛋白的NIH-3T3细胞株。构建含Jagged-1全编码区基因的pEGFP-IRES2-Jagged-1真核表达载体。结果表明,重组质粒转染哺乳动物细胞NIH-3T3后,Western blot分析证实转染后NIH-3T3细胞高效表达Jagged-1蛋白;经过选择性培养基筛选及有限稀释法挑取单克隆细胞后,流式细胞术(FCM)分析证实建立起过表达Jagged-1蛋白的单克隆细胞模型,即NIH-3T3-pEGFP-IRES2-Jagged-1细胞株。结论:本研究成功构建了Jagged-1真核表达载体,并建立了稳定转染的单克隆细胞株。过表达Jagged-1蛋白的NIH-3T3单克隆细胞株的构建为我们研究骨髓基质细胞相关的细胞耐药的作用机制并为发现新的药物作用靶点提供条件。

Expression of Human Jagged-1 Protein on Eukaryotic Cells and Establishment of Stable Transfectant Cell Line

Jagged-1 protein is one of the ligands belonging to Notch signaling pathway. Notch signaling pathway is one of the major signaling pathways mediated by contact between cells and plays an important role to regulate the process of proliferation and differentiation of hematopoietic cells in the hematopoietic microenvironment. To study the biological effect after the combination of receptor and ligand in Notch signaling pathway and the mechanism of Notch signaling pathway in bone marrow stromal cells mediated-drug resistance, a NIH-3T3 cell line over-expressing Jagged-1 protein was constructed for further research purposes. A full coding region of Jagged-1 gene was cloned and inserted into eukaryotic expression plasmid to construct pEGFP-IRES2-Jagged-1 eukaryotic expression vector, then transfected into NIH-3T3 cell line, a mammalian cells. As a result Western blot analysis confirmed that the transfectant NIH-3T3 cells highly expressed Jagged-1 protein and flow cytometry analysis confirmed that the NIH-3T3-pEGFP-IRES2-Jagged-1 cell line over-expressed Jagged-1 protein was monoclonal after screened by selective medium and limiting dilution analysis. It is concluded that the pEGFP-IRES2-Jagged-1 eukaryotic expression vector and a stable transfectant monoclonal NIH-3T3 cell line are successfully established. The construction of the stable transfectant monoclonal NIH-3T3 cell line which overexpressed Jagged-1 protein, provides the conditions to further study the mechanism of the bone marrow stromal cellmediated drug resistance and to discover the new drug targets.