不同方法转染人外周血淋巴细胞效率比较

Comparison of transfection efficiency of lymphocytes from human peripheral blood by different methods

目的 采用不同方法转染原代人外周血淋巴细胞,以寻找一种简便、高效的淋巴细胞转染方法.方法 采用聚蔗糖-泛影葡胺（Ficoll-Hypaque）分离法从健康人外周血中分离出单个核细胞,锥虫蓝检测细胞存活率.单个核细胞在6孔板内培养2h后吸出悬浮的淋巴细胞至24孔板中继续培养.分别采用电穿孔介导载体质粒（PEGFP-N1）转染活化的淋巴细胞、慢病毒（LVGFP）单次感染及慢病毒重复感染方法分别转染静息或活化的淋巴细胞,在荧光显微镜下观察感染后不同时间点细胞绿色荧光蛋白（GFP）表达情况,同时收集细胞用流式细胞术检测GFP阳性细胞的比例,比较不同条件下慢病毒感染淋巴细胞的效率.结果 通过Ficoll-Hypaque分离的单个核细胞的纯度可达95％,其活细胞率＞95％,获得的淋巴细胞占90％～ 95％,形态较均一.“2 100V、10 ms、1个脉冲”电穿孔淋巴细胞后可见散在荧光,但随着时间推移荧光逐渐减弱,72 h基本看不到荧光.慢病毒单次感染静息期淋巴细胞48 h后无绿色荧光,流式细胞术检测GFP阳性细胞＜1％.慢病毒单次感染增殖期淋巴细胞可见绿色荧光,且随着病毒浓度增大,荧光逐渐增强,GFP阳性细胞在1％～5％之间.慢病毒重复感染增殖期淋巴细胞可见较强绿色荧光,GFP阳性细胞在5％～10％左右,随着时间推移荧光逐渐增强.结论 慢病毒重复感染增殖期淋巴细胞,能有效地将外源基因导入淋巴细胞内稳定表达.

Objective To explore the transfection efficiency of primary lymphocytes from human peripheral blood by different methods to acquire the method with higher transfection efficiency.Methods Mononuclear cells from human peripheral blood were isolated using Ficoll-Hypaque.Cell viability was detected by Trypan blue staining.Suspending lymphocytes were sucked out and were incubated in 24-well plate after cultured in 6-well plate for 2 h.Activated lymphocytes were transfected by electroporation with plasmid（PEGFP-N1）.Resting or activated lymphocytes were transfected by lentivirus vector（LVGFP） single infection or repeated infection,respectively.Green fluorescence protein （GFP） was detected under the fluorescence microscopy and percentage of positive cells was checked by flow cytometry at different time points after infection.At the same time,the effectiveness of lentivirus infection was compared under different conditions.Results Purity of mononuclear cells isolated by Ficoll-Hypaque was 95 % and its viability was over 95 %.The percentage of lymphocytes obtained with a uniform shape was 90 %-95 %.Scattered fluorescence was observed by electroporation under the conditions of voltage 2 100 V,pulse width 10 ms,pulse number 1 for lymphocyte,while fluorescent became weaker over time and no green fluorescent was observed after transfection for 72 h.After resting lymphocytes were infected once for 48 h by lentivirus vector,green fluorescent was not found and positive cells were less than 1%.1%-5 % of activated lymphocytes could express GFP after single lentivirus infection and the expression levels were enhanced with concentration increasing,while 5 %-10 % of activated lymphocytes showed strong green fluorescent by repeated lentivirus infection.In contrast with electroporation,the fluorescent with lentivirus infection was stronger over time.Conclusion Repeated lentivirus infection could efficiently transfect exogenous genes into activated lymphocytes for stable expression.