摘要目的 探讨miR-218对胃癌细胞增殖及细胞周期的影响.方法 将miR-218 mimics转染胃癌细胞株SGC-7901和MGC-803细胞,以无关序列(Scramble mimics)作为阴性对照.采用qRT-PCR技术验证miR-218 mimics转染细胞中miR-218的表达水平;通过细胞计数法及MTS[3-(4,5-二甲基噻唑-2-基)-5-(3-羧甲酯基)-2-(4-磺苯基)-2氢-四唑,内盐]法观察miR-218过表达对胃癌细胞增殖的影响;采用流式细胞术观察miR-218过表达对胃癌细胞周期的影响.结果 转染miR-218 mimics胃癌细胞中miR-218的表达量较对照细胞显著升高.过表达miR-218的胃癌癌细胞增殖速度明显减慢(P＜0.05).通过流式细胞术分析细胞周期发现,过表达miR-218的胃癌细胞阻滞于G1期.结论 miR-218能抑制胃癌细胞生长增殖,阻止胃癌细胞周期进程,它可能在胃癌的发生发展中发挥重要作用.

abstractsObjective To investigate the effect of miR-218 on cell proliferation and cell cycle in the gastric cancers (GC).Methods SGC-7901 and MGC-803 cells were transfected with miR-218 mimics.Meanwhile,SGC-7901 and MGC-803 cells were transfected with control mimics (Scramble mimics) as negative control.Quantitative reverse transcription polymerase chain reaction (qRT-PCR) was used to detect the miR-218 expression in these transfected cells.The effect of miR-218 overexpression on cell proliferation was evaluated with direct cell counting and MTS [3-(4,5-dimethylthiazol-2-yl)-5 (3-carboxymethonyphenol)-2-(4-sulfophenyl)-2H-tetrazolium inner salt] assay.Moreover,the effect of miR-218 overexpression on cell cycle was examined by fluorescence activated cell sorting (FACS).Results miR-218 expression was remarkably induced in miR-218-transfected cells,miR-218 overexpression led to a significant decrease in cell proliferation rate compared to control cells (P ＜ 0.05).miR-218 overexpression induced GC G1 arrest.Conclusions miR-218 can suppress GC cell proliferation and block cell cycle progression.It maybe play an important role in tumorigenesis and development of GC.