荧光蛋白表达对小鼠成纤维细胞系NIH3T3体外增殖能力的影响

目的观察不同荧光蛋白表达对体外培养的小鼠成纤维细胞系NIH3T3增殖能力的影响,为细胞示踪技术提供理论依据。方法将体外扩增培养的NIH3T3细胞随机分为对照组、pLEGFP-N1组、pEGFP-N1组、pDsRed2-C1组。对照组不作任何处理,其他3组分别采用逆转录病毒载体pLEGFP-N1和真核表达载体pEGFP-N1、pDsRed2-C1两种转染方式进行增强型绿色荧光蛋白(EGFP)和红色荧光蛋白(RFP)标记,经G418筛选培养后,观察各组细胞荧光蛋白表达情况,并计算其阳性表达率;观察各组细胞贴壁率,绘制生长曲线并测定倍增时间。结果对照组NIH3T3细胞未见荧光蛋白表达;pLEGFP-N1、pEGFP-N1组均表达EFGP,pDsRed2-C1组表达RFP,而pLEGFP-N1组阳性表达率高于另外两组(P<0.01).各组细胞均有较高的贴壁率。pEGFP-N1组细胞倍增时间为(39.6±0.6)h,pDsRed2-C1组(40.3±0.7)h,pLEGFP-N1组(36.5±0.7)h,均明显晚于对照组(27.9±0.6)h(P<0.01).结论荧光蛋白表达对NIH3T3细胞体外增殖有一定程度的影响,但逆转录病毒载体抑制作用低于普通真核表达载体,可作为细胞移植时荧光蛋白标记的较好选择。

Influence of fluorescent protein expression on the proliferation of NIH3T3 cells in vitro

OBJECTIVE: To investigate the influence of fluorescent protein expression on the proliferation of murine NIH3T3 cells, so as to provide a theoretical basis for cell tracing technology. METHODS: NIH3T3 cells were cultured in vitro, and were randomly divided into control, pLEGFP-N1 (with transfection of pLEGFP-N1 retroviral vector), pEGFP-N1 (with transfection of pEGFP-N1 vector) and pDsRed2-C1 (with transfection of pDsRed2-C1 vector) groups. Then the cells were screened by G418 for 3 weeks. The changes in cell adhesive rate were observed and the population doubling times was determined by growth curve. RESULTS: There was obvious fluorescent protein expression in the transfected NIH3T3 cells after G418 selection, and the highest percentage of labeled NIH3T3 cells was found in pLEGFP-N1 group. The population doubling time in pDsRed2-C1 (40.3+/-0.7 h) , PEGFP-N1 (39.6 +/- 0.6 h) and pLEGFP-N1 (36.5 +/- 0.7 h) groups was evidently longer than that in control (27.9 +/- 0.6 h, P < 0.01), with high adhesive rate in each group. CONCLUSION: The expression of fluorescent protein exhibited some inhibitory effect on the proliferation of NIH3T3 cells in vitro. Since the inhibitory effect by retroviral vector was weaker compared with eukaryotic vector, it should be the first choice for fluorescent protein labeling during cell transplantation.