色素上皮细胞衍生因子与胶质瘤侵袭的相关性

摘要

目的 评价色素上皮细胞衍生因子(PEDF)对胶质瘤侵袭的抑制作用.方法 将PEDF(100 ng/ml)加入胶质瘤细胞U87中(U87PEDF),以未加PEDF蛋白的胶质瘤细胞作对照组(U87con),同时在U87PEDF中加入0.25μg/ml的促血管生成因子(VEGF,U87PEDF+VEGF).细胞迁徙实验检测PEDF抑制胶质瘤细胞侵袭性;实时荧光定量逆转录(RT)-PCR检测层粘连蛋白Laminin-8表达.结果 迁徙实验结果表明,对照组胶质瘤细胞穿透数明显多于PEDF处理组细胞,加入VEGF后,胶质瘤细胞迁徙率的抑制率仍减少38%;实时荧光定量RT-PCR结果显示,U87对照组 Laminin-8α4、β1、γlmRAN表达分别为(1.043±0.090)、(0.823±0.012)、(0.762±0.005)拷贝/μl,明显高于U87PEDF组[(0.633±0.004)、(0.442±0.005)、(0.424±0.002)拷贝/μl,P＜0.05].结论 在VEGF存在的条件下,PEDF能有效抑制胶质瘤细胞的迁徙,表明其可能由下调Laminin-8基因的表达所致.%Objective To assess the impact of pigment epithelium-derived factor(PEDF) on the migration of the glioma cells.Methods PEDF(100 ng/ml)was added to U87 cells(U87PFDF),and VEGF of 0.25μg/ml was added to U87PEDF+VEGF while U87 cells as control(U87con).The cell migratory assav was used tbr evaluating its inhibitory migration rate of PEDF.Real time RT-PCR was used for evaluating the expression of Laminin-8 gene.Results The number of migratory cells was higher than those with added PEDF,and the inhibitory rate of migratory was 38% even in the presence of VEGF.Real time RT-PCR revealed that the mRNA expression levels of α4,β1,γl were(1.043±0.090),(0.823±0.012).(0.762±0.05) copy/μl,which were higher than those treated by PEDF(0.633±0.004),(0.442±0.005).(0.424±0.002)copy/μl,respectively (P＜0.05).Conclusion PEDF could decrease the migmtory capacity of the glioma cells even in the presence of VEGF because of the regulation of Laminin-8 in part.