摘要目的 研究miR-133a表达对人骨肉瘤细胞增殖及凋亡的影响.方法 qPCR检测miR-133a在骨肉瘤细胞及骨肉瘤样本中的本底表达,然后转染miR-133a拟似物至骨肉瘤细胞,检测细胞增殖与凋亡的变化,并通过含Bcl-xL和Mcl-1的3'UTR区的荧光素酶报告基因载体验证miR-133a是否可下调凋亡抑制基因的表达.结果 qPCR结果表明,miR-133a在骨肉瘤细胞及样本中的本底表达较正常成骨细胞和组织低,经转染miR-133a后骨肉瘤细胞增殖速度降低,凋亡比例提高.经双荧光素酶报告基因检测及Western Blot验证miR-133a能够下调凋亡抑制基因Bcl-xL和Mcl-1的表达,进而抑制骨肉瘤细胞的增殖并诱导凋亡.结论 miR-133a作为抑癌基因在骨肉瘤发生发展中具有抑制作用,为骨肉瘤的预后判断和临床治疗提供了新的潜在靶点.

abstractsObjective To investigate the effects of miR-133a expression on the proliferation and apoptosis of human osteosarcoma cells.Methods The expressions of miR-133a in osteosarcoma cell lines and samples were assayed by qPCR.After transfection of mimic miR-133a to osteosarcoma cells,changes in cell proliferation and apoptosis were detected by MTT and FCM assays.Inhibition of Bel-xL and Mcl-1 might be responsible for the tumor suppressive effect of miR-133a by assay of double fluorescent report gene detection,so as to verify if miR-133a could down-regulate the expression of apoptosis inhibition gene.Results qPCR assay indicated that the expression of miR-133a in osteosarcoma cells and samples was lower than that in normal osteoblast cells.Following transfection of miR-133a,rate of osteosarcoma cells proliferation decreased,while rate of apoptosis increased.Assay of double fluorescent report gene and Western blot detection indicated that miR-133a could not only down-regulate the expressions of apoptosis inhibition genes (Bel-xL and Mcl-1),but inhibit the proliferation of osteosarcoma cells and promote apoptosis of the cells involved.Conclusions Being a tumor suppressor gene,miR-133a played an important role in the occurrence and development of osteosarcoma,and for this reason,it might provide a new evidence or potential target for prognosis and treatment of osteosarcoma clinically.