长链非编码RNA FAM201A靶向miR-488-3p对胃癌细胞生物学行为及放射敏感性的影响

The long-chain noncoding RNA FAM201A influences the biological behavior and radiation sensitivity of gastric cancer cells by targeting miR-488-3p

目的:探讨长链非编码RNA(lncRNA)序列相似性家族201-成员A(family with sequence similarity 201-member A,FAM201A)靶向miR-488-3p对胃癌细胞生物学行为及放射敏感性的影响.方法:选取2014年1月至2017年1月间于莱阳中心医院确诊并进行胃癌根治性切除手术(术前均未经过放疗和化疗治疗)的胃癌患者的肿瘤组织标本和配对的非癌性黏膜标本63例,采用qRT-PCR检测63例胃癌组织和与其对应的癌旁组织中FAM201A及miR-488-3p的表达水平.构建抑制FAM201A表达的MGC803胃癌细胞株.四甲基偶氮唑蓝(methyl thiazolyl tetrazolium,MTT)法检测细胞增殖活力,流式细胞术检测细胞凋亡,Transwell法检测细胞的迁移和侵袭能力.用不同辐射强度(0、2、4、6和8 Gy)射线照射抑制FAM201A表达的MGC803细胞,克隆形成实验检测细胞存活分数,绘制单击多靶模型拟合曲线.双荧光素酶报告基因实验和qRT-PCR验证FAM201A和miR-488-3p的靶向关系.结果:与癌旁组织相比,胃癌组织中FAM201A的表达水平显著升高,miR-488-3p的表达水平显著降低.抑制FAM201A可显著抑制MGC803细胞增殖、迁移和侵袭,促进其凋亡,增加MGC803细胞的放射敏感性.FAM201A可靶向负性调控miR-488-3p表达.抑制miR-488-3p能够逆转抑制FAM201A对细胞MGC803增殖、凋亡、迁移侵袭和放射敏感性的影响.结论:抑制lncRNA FAM201A通过靶向miR-488-3p可抑制胃癌细胞增殖、迁移和侵袭,促进胃癌细胞凋亡,并增加其放射敏感性.FAM201A有望成为胃癌的新型分子靶点.

Objective:To investigate the miR-488-3p-mediated effects of the long-chain noncoding RNA(lncRNA)family with sequence similarity 201-member A(FAM201A)on the biological behavior and radiosensitivity of gastric cancer cells.Methods:Sixty-three pairs of gastric carcinoma tissues and paracancerous tissues were resected from gastric carcinoma patients,who underwent surgery(no radiotherapy or chemotherapy treatment before surgery)at Laiyang Central Hospital of Yantai City during January 2014 and January 2017.The expression levels of FAM201A and miR-488-3p in the 63 gastric cancer tissue samples and their paracancerous tissues were detected by real-time quantitative reverse-transcription polymerase chain reaction(qRT-PCR).The gastric cancer cell line MGC803 with inhibited FAM201A expression was constructed.The proliferation and viability of MGC803 cells were assessed by the Methyl Thiazolyl Tetrazolium(MTT)assay;their apoptosis was measured by flow cytometry;and their migration and invasion abilities were tested by the Transwell assay.Further,the MGC803 cells were irradiated with different radiation intensities(0,2,4,6,and 8 Gy).Cell survival fractions were measured by colonyformation assay,and cell survival curve was stimulated by the single-hit multi-target model.The dual-luciferase reporter gene assay and qRT-PCR were used to verify whether FAM201A targets miR-488-3p.Results:The expression level of FAM201A was significantly higher,while that of miR-488-3p was significantly lower in gastric cancer tissues than in the paracancerous tissues.Inhibiting FAM201A expression significantly suppressed the proliferation,migration,and invasion abilities of MGC803 cells,promoted their apoptosis,and increased their radiosensitivity.FAM201A negatively regulated miR-488-3p expression.Inhibiting miR-488-3p expression reversed the effects of the inhibition of FAM201A expression on the proliferation,apoptosis,migration,and radiosensitivity ofMGC803 cells.Conclusions:Inhibiting the expression of the lncRNA FAM201A suppressed the proliferation,migration,and invasion abilities of gastric cancer cells,promoted their apoptosis,and increased their radiosensitivity by targeting miR-488-3p.Thus,FAM201A may serve as a novel molecular target for gastric cancer treatment.