目的:建立稳定表达EGFR-GFP融合蛋白的细胞系。方法:CaC l2法将pEGFR-EGFP质粒转化DH5α,酶切鉴定后提取质粒经电穿孔转染CHO-K1细胞;以EGFP作为荧光报告分子,克隆化培养以获取单克隆阳性细胞;流式细胞术、荧光显微镜术、W estern B lot检测转染细胞EGFR-GFP融合蛋白的表达;比较稳定转染细胞及未转染细胞的生长曲线;反复冻存、复苏、传代鉴定细胞表达EGFR-GFP融合蛋白的稳定性。结果:获得1株稳定表达EGFR-GFP融合蛋白的细胞系,命名为CHO-EGFR-GFP1,融合蛋白主要表达于细胞膜。稳定转染细胞和未转染细胞生长特性无显著差异。结论:成功获得膜表面稳定表达EGFR-GFP融合蛋白的细胞系,为研制以EGFR为靶点的抗肿瘤药物以及研究EGFR与其配体间相互作用奠定了基础。
Objective: To inhibit specifically survivin expression and block its function in leukemia cells, an antisense RNA expression plasmid for survivin was constructed and transfected into a leukemia cell line.Methods: A cDNA fragment of survivin obtained by RT-PCR was inserted into a plasmid vector named pcDNA3 in the reverse direction. Antisense RNA of survivin was confirmed by restriction enzyme digestion and DNA sequencing. The recombinant plasmid was transfected into the cell line HL-60 by electroporation. The effect of survivin antisense RNA on survivin mRNA expression in transfected cells was examined by RT-PCR.Results: The correct construction of the recombinant plasmid has been shown by restriction enzyme digestion and DNA sequencing. As compared to controls, the level of survivin mRNA expression in transfected cells decreased significantly.Conclusion: An antisense RNA vector for survivin has been successfully constructed and may be useful as a specific inhibitor in leukemia cells. Thus, antisense therapy on the basis of survivin can be further explored in leukemia. Key words leukemia - survivin - antisense RNA This project was supported by a grant from National Key Basis Research Program of China (No. CB 513109) and the National Natural Sciences Foundation of China (No. 39970693).
