MicroRNA-126与胃癌患者放化综合治疗效果的关系及其对胃癌SGC-7901细胞的放射增敏作用

目的:研究microRNA-126与胃癌患者放化综合治疗疗效的关系及其对胃癌细胞的放射增敏效果。方法:选取2014年6月~2015年6月间我院收治的晚期胃癌患者60例为研究对象,其中男性32例,女性28例,年龄37~65岁,平均年龄(51±7)岁。所有患者均接受放化综合治疗。收集患者的胃癌病理组织标本,同时于治疗结束时采集静脉血标本。采用国际实体瘤疗效评价标准(RECIST)评价患者的近期疗效,根据疗效将患者分为治疗敏感组和非敏感组。实时荧光定量PCR检测各组患者组织及血浆中microRNA-126的表达变化。体外培养胃癌SGC-7901细胞并转染microRNA-126 mimic;平板集落形成实验分析microRNA-126 mimic转染对SGC-7901细胞放射敏感性的影响;流式细胞术检测转染microRNA-126 mimic对SGC-7901细胞凋亡率的影响。结果:根据RECIST,共28例患者对治疗敏感,32例患者对治疗不敏感。与敏感组患者相比,不敏感组患者血浆和胃癌组织中的microRNA-126相对水平较低,相对于敏感组的倍数分别为0.72±0.04和0.48±0.03,差异具有统计学意义(P0.05)。MicroRNA-126 mimic转染后SGC-7901细胞的SF_2值和D_0值减小(P0.05),增敏比为1.74。流式细胞术分析结果发现,microRNA-126 mimic转染可以诱导SGC-7901细胞凋亡,并增加射线引起的细胞凋亡。结论:较低的microRNA-126提示胃癌患者放化综合治疗疗效不佳;microRNA-126具有增加胃癌细胞放射敏感性的作用。

Relationship between microRNA-126 and curative effect of chemoradiotherapy in patients with gastric cancer,and enhancement effect of microRNA-126 on radiosensitivity of SGC-7901 cells

AIM: To investigate the influences of microRNA-126 on the curative effect of chemoradiotherapy and radiosensitivity of SGC-7901 cells. METHODS: The patients of gastric cancer (n=60) were selected in this study including 32 males and 28 females with the average age of (51±7) years. All patients received similar chemoradiotherapy strategy. The tissue and blood samples were collected during treatment. The short-term curative effect was evaluated by the Response Evaluation Criteria in Solid Tumors (RECIST), and the patients were divided into sensitive group and insensitive group. The microRNA-126 levels were detected by RT-qPCR. The SGC-7901 cells were maintained inRESULTS: According to the RECIST, 28 cases were defined as sensitive patients and 32 cases were the insensitive patients. Compared with the sensitive patients, the microRNA-126 levels both in blood and tissue samples were lowered in the insensitive patients, and the relative fold changes were 0.72±0.04 and 0.48±0.03, respectively (P<0.05). After transfection with microRNA-126 minic, the SF₂ and D₀ in the SGC-7901 cells were decreased with the SER of 1.74. Furthermore, microRNA-126 induced apoptosis of SGC-7901 cells and enhanced their radiosensitivity.CONCLUSION: The patients with low microRNA-126 level may suffer a poor curative effect of chemoradiotherapy on the gastric cancer. MicroRNA-126 has an enhancement effect on the radiosensitivity to the SGC-7901 cells.