小鼠GM-CSF基因真核表达载体的构建及其表达活性的鉴定

Construction and identification recombinant eukaryotic expressive vector of mouse GM-CSF gene

目的:构建小鼠GM-CSF基因的高效真核表达载体,筛选导入该载体后高水平表达GM-CSF的小鼠淋巴瘤细胞系RMA,并探讨转GM-CSF基因瘤苗治疗小鼠T淋巴细胞瘤的方法。方法:PCR扩增小鼠CM-CSF cDNA3’端770bp的片段,将其插入真核表达载体pcDNA3;用电穿孔法将构建的载体导入小鼠淋巴瘤细胞系RMA,有限稀释法制备单个细胞克隆,经RT-PCR、骨髓祖细胞增殖实验和集落形成实验筛选相对高表达GM-CSF的RMA克隆,该克隆细胞经丝裂霉素灭活后免疫小鼠以诱导其产生抵抗RMA肿瘤细胞再攻击的能力。结果:构建的重组质粒含有预期片段,插入方向正确,核酸序列无误;且获得了高表达GM-CSF的RMA克隆,将其用丝裂霉素灭活免疫小鼠后使它们产生了抗肿瘤免疫保护力。结论:转GM-CSF基因瘤苗可能作为有效的抗T淋巴细胞瘤瘤苗。

Objective: Construction mouse GM-CSF gene effective eukatyotic expressive vector, selection high GM-CSF expressing mouse leukemia cell line RMA after transfected with the constructed vector, and study the method of treatment leukemia with tumor cells transfected with GM-CSF gene.Methods:770 bp of GM-CSF 3' end cDNA was amplified by PCR and inserted into pcDNAS vector.The constructed vector was transfected into RMA cells by electroporation. After screening by G418 and cloning by limiting dilution, a relative high GM-CSF expressing cell clone was selected by RT-PCR, hematopoietic progenitor cell proliferative assay and hematopoietic progenitor cell colony formation assay. The cells of this clone were inactivated by mitomycin-C and vaccinated mice to induce antitumor immune reaction. Results: The orientation and sequence of the insert was found to be correct, and a GM-CSF high expressing cell line RMA-GM was selected , which can induce mice obtain anti-tumor protective immune ability after inactivated by mitomycin-C.Conclusion:Tumor cells transfected with GM-CSF gene may be used an effective anti-T lymphycoma tumor vaccine.