GFP mRNA在树突状细胞中的转染及其影响因素分析

Transfection of GFP mRNA in dendritic cells and analysis of some factors involved

目的:探讨绿色荧光蛋白(GFP)mRNA在树突状细胞(DC)中的转染及其影响因素。方法:选用gfp报告基因,在体外利用含T7RNA聚合酶的mMESSAGERNA转录试剂盒,合成含有帽子结构的GFPmRNA,通过酵母多聚A聚合酶加尾,制备结构完整的GFPmRNA。与此同时,从人的外周血液中分离单核细胞,并在体外经GM-CSF和IL-4刺激分化为DC。通过转染试剂介导将合成的GFPmRNA转染到DC内并使其表达。采用流式细胞术检测其转染效率和表达水平。结果:体外合成GFPmRNA,经转染试剂介导,实现了gfp基因在DC中的表达。不同的转染试剂、mRNA用量和细胞密度对mRNA的转染效率有较大的影响。采用Transmes-sengerTransfectionKit转染试剂,1μgGFPmRNA在200μLX-VIVO-15无血清培养基中的转染密度为2.5×109/L的DC,可获得较好的转染效果(转染效率达27%以上)。结论:在适当的条件下,通过mRNA转染DC可获得较高的转染效率。

AIM： To investigate the transfection of green fluorescent protein （GFP） mRNA in dendritic cells （DC） and analyze some factors which influence the transfection efficiency. METHODS： GFP （as a report gene） mRNA with cap was synthesized, in vitro, with mMESSAGE RNA Transcription Kit containing T7 RNA polymerase, and then the poly（A） was added to the GFP caped-mRNA by yeast poly（A） polymerase. DC were generated from the monocytes isolated from human peripheral blood by stimulation of GM-CSF and IL-4. The GFP mRNA was transfected into DC mediated by transfection reagent. The transfection efficiency and the expression levels were measured by flow cytometry. RESULTS： GFP expression in DC has been obtained by transfecting its mRNA synthesized in vitro, The transfection reagents, mRNA concentnations and cell densities have the significant effects on the transfection. The high level of transfection efficiency （ up to 27% ） was obtained using Transmessenger Transfection Kit with 1 μg gfp mRNA in 200 μL X-VIVO-15 serum-free medium at the cell density of 2.5 × 10^9/L. CONCLUSION： The high-level transfection efficiency of gfp gene in DC could been achieved by using GFP mRNA in the optimum transfection conditions.