【摘要】 目的:构建人穿孔素N端(hPFN-N)的真核放射诱导表达载体,并在放射诱导条件的刺激下研究hPFN-N的表达产物(rhPFN-N)在肺癌细胞SPC-A1中的分布及其对该细胞的细胞毒性作用。方法:以克隆有hPFN全长cDNA序列的载体pcDNA3·1(+)/hPFN为模板,用PCR扩增hPFN-N,将该基因片段克隆到含放射诱导启动子的真核表达载体pcDNA3·1(+)/Egr-1中,以重组体稳定转染SPC-A1细胞,经过X射线的放射诱导后,应用RT-PCR、细胞免疫化学法检测hPFN-N蛋白的表达,用MTT法测定该蛋白对靶细胞的杀伤活性。结果:成功构建了真核放射诱导表达载体pcDNA3·1(+)/Egr-hPFN-N。以重组体转染SPC-A1细胞后,用RT-PCR检测到hPFN-N mRNA的表达。细胞免疫化学法检测结果呈阳性反应,MTT法检测结果为rhPFN-N对靶细胞的杀伤活力为29·2%。结论:构建了pcDNA3·1(+)/Egr-hPFN-N真核放射诱导表达载体,在经过X射线的放射诱导后,hPFN-N能够在SPC-A1细胞的细胞膜上大量表达,表达产物rhPFN-N对靶细胞有明显杀伤活力。更多还原

【Abstract】 Objective:To construct an eukaryotic radiation-inducible expressing vector of the human perforin N-terminal(hPFN-N),and to investigate the distribution and the killing effect of human perforin N-terminal truncated 118 amino acid polypeptide (rhPFN-N,22-139aa) on tumor cells.Methods:The gene hPFN-N was amplified by PCR from the plasmid pcDNA3.1(+)/hPFN and an enkaryotic radiation-inducible expression vector pcDNA3.1(+)/ Egr-hPFN-N was constructed after DNA recombination.After transfecting SPC-A1 cells with this recombination vector via liposome mediation,the expression of the hPFN-N protein was detected by RT-PCR and Immunocytochemical method and the killing effect of hPFN-N protein was assessed by standard MTT chromatometry.Results:DNA sequencing and restriction endonuclease digestion analysis indicated that the eukaryotic radiation-inducible expressing vector pcDNA3.1(+)/ Egr-hPFN-N had been constructed successfully.After the recombinant plasmid being transfected into SPC-A1 cells and being irradiated by X ray,RT-PCR verified the expression of hPFN-N mRNA.The result of Immunocytochemical assay was positive and in MTT assay the killing activity of rhPFN-N on target cells was 29.2%.Conclusion:After being irradiated the hPFN-N gene is expressed on the cell membrane and the killing activity of rhPFN-N on target cells is 29.2%.更多还原