中文摘要：

目的构建稳定表达萤火虫荧光素酶的大鼠脑胶质瘤细胞株C6-Luc。方法通过浓度梯度法测定C6大鼠脑胶质瘤细胞的潮霉素最佳筛选浓度。使用FuGENEHD转染试剂将表达荧光素酶的真核质粒pGL4.50转染至C6细胞,应用潮霉素筛选多克隆细胞株,进一步采用有限稀释法筛选单克隆细胞株。采用报告基因分析对单克隆细胞株进行阳性鉴定,并考察荧光素酶在阳性克隆中表达的稳定性。对阳性克隆进行体外生物发光检测,确定最小细胞检测量,并采用线性回归分析生物发光强度与细胞数量的相关性。将阳性克隆细胞种植于Wistar大鼠脑部,应用生物发光成像检测系统对肿瘤细胞在脑部的生长进行体内监测。结果 C6细胞的潮霉素最佳筛选浓度为250μg/ml。质粒pGL4.50成功转染至C6细胞,通过潮霉素抗性筛选得到12个单克隆细胞株。通过荧光素酶报告基因分析,成功鉴定了荧光素酶表达活性最高的阳性克隆,命名为C6-Luc,连续培养3代后C6-Luc细胞表达荧光素酶的活性无显著差异。体外生物发光检测结果显示C6-Luc细胞的最小检测数量为78个,细胞发光强度（y）与细胞数量（x）呈良好的线性关系,回归方程为y=81.348x-2143.1,相关系数r=0.997。体内生物发光检测结果显示,Wistar大鼠脑部种植C6-Luc细胞后,随肿瘤体积增大,大鼠脑部的发光强度逐渐增强。结论成功构建了稳定表达荧光素酶的大鼠脑胶质瘤细胞株C6-Luc。

英文摘要：

Objective To construct the rat glioma cell line C6-Luc to stably express the firefly luciferase.Methods The optimal concentration of hygromycin for screening C6 rat glioma cells was determined by concentration gradient method.The eukaryotic plasmid pGL4.50 expressing luciferase was transfected into C6 cells by using FuGENE HD transfection reagent,followed by screening the polyclonal cell lines with hygromycin,subsequently screening the monoclonal cell line by limited dilution.The positive monoclonal cell lines were identified with reporter gene assay,thereafter the expression stability of luciferase was investigated in the positive cell lines.The bioluminescence detection in vitro in the positive monoclonal cell line was performed to determine the minimum detection amount of cells,and the correlation between bioluminescence intensity and cell amount was analyzed by linear regression analysis.The positive monoclonal cells were implanted into the brain of Wistar rats,and the tumor growth in rats’ brain was detected in vivo using the bioluminescence imaging detection system.Results The optimal concentration of hygromycin used in screening C6 cells was 250 μg/ml.The eukaryotic plasmids pGL4.50 was successfully transfected into C6 cells,and 12 monoclonal cell lines were obtained by anti-hygromycin screening.A positive clone with the highest activity of luciferase,designated as C6-Luc,was successfully identified by using luciferase reporter gene assay,which showed a stable activity of expressing luciferase after 3 continuous passages of cultivation.The bioluminescence detection in vitro showed that the minimum detection amount of C6-Luc cells was 78.A good linear correlation existed between bioluminescence intensity and the amount of C6-Luc cells,with an equation of y=81.348x-2143.1 and correlation coefficient（r） of 0.997.The in vivo bioluminescence imaging detection showed tumorigenesis could be detected after implantation of C6-Luc cells into the brain of Wistar rats.The intensity of bioluminescence increas