[摘要] 目的：检测微小RNA-380-5p（miR-380-5p）在人宫颈癌组织和细胞系中的表达，探讨其抑制宫颈癌C33A细胞增殖和迁移的作用机制。方法：收集2016 年12 月至2017 年7 月同济医学院附属武汉中心医院妇产科手术切除的16 例宫颈癌患者癌组织和对应的癌旁组织标本，以及宫颈癌细胞系HCC94、C33A、Hela、SiHa 和人子宫颈上皮永生化细胞H8，用qPCR 法检测miR-380-5p 在癌及癌旁组织、4 种宫颈癌细胞及H8 细胞中的表达。用脂质体转染技术将miR-380-5p mimic（实验组）和miR-NC（阴性对照组）瞬时转染C33A细胞，用qPCR法检测转染后细胞中miR-380-5p 表达，CCK-8 法和Transwell 小室法分别检测转染细胞的增殖和迁移能力。用生物信息学软件TargetScan 预测miR-380-5p 的下游基因，用双荧光素酶报告基因实验验证miR-380-5p 对下游基因Ras 同源基因家族成员A（Ras homolog gene family member A，RHOA）的结合作用，qPCR 法和Western blotting 检测miR-380-5p 下游基因RHOA的表达。结果：宫颈癌组织中miR-380-5p 表达水平明显低于癌旁组织（P<0.01），宫颈癌细胞系中miR-380-5p 表达水平均明显低于H8 细胞（P<0.05），以C33A细胞中的表达水平最低（P<0.01）。与阴性对照组比较，转染miR-380-5pmimic 能显著抑制C33A细胞的增殖（P<0.05）和迁移能力（P<0.01），且下调RHOA、ROCK1、ROCK2、CDK2和N-cadherin蛋白的表达（均P<0.01）。生物信息学软件预测RHOA可能为miR-380-5p 的调控基因，双荧光素酶报告基因实验结果显示miR-380-5p 可与RHOA 3’-非编码区（UTR）特异性结合，miR-380-5p 可明显下调RHOA基因的表达（P<0.01）。结论：miR-380-5p 在宫颈癌组织及细胞系中低表达，过表达miR-380-5p 可能通过下调RHOA及其下游蛋白的表达抑制宫颈癌C33A细胞的增殖和迁移。

[Abstract] Objective: To investigate the expression of microRNA-380-5p (miR-380-5p) in cervical cancer tissues and cell lines, and to explore the mechanism of miR-380-5p inhibiting the proliferation and migration of cervical cancer cells. Methods: 16 pairs of cervical cancerous tissues and corresponding para-cancerous tissues were collected from the Department of Obstetrics and Gynecology, the Affiliated Wuhan Central Hospital of Tongji Medical College from December 2016 to July 2017; in addition, cervical cancer cell lines (HCC94, C33A, Hela, SiHa) and human cervical epithelial immortalized H8 cells were also collected for this study. The expression of miR-380-5p in above mentioned tissues and cell lines was detected by Real-time quantitative polymerase chain reaction (qPCR). miR-380-5p mimic (experimental group) and miR-NC (negative control group) were transiently transfected into C33A cells by lipofection,and qPCR was used to detect the expression of miR-380-5p in the transfected cells. Cell proliferation and migration were evaluated by cell counting kit (CCK-8) and Transwell assay. Bioinformatics software TargetScan predicted the downstream genes of miR-380-5p,and dual luciferase reporter assay was used to verify the binding of miR-380-5p to the downstream gene RHOA (Ras homolog gene family member A). qPCR and Western blotting were used to detect the expression of miR-380-5p downstream gene-RHOA. Results:The expression level of miR-380-5p in cervical cancer tissues and cell lines was significantly lower than that in para-cancerous tissues and normal cervical epithelial H8 cells (P<0.01); and the expression in C33A cells was the lowest (P<0.01). Compared with the negative control group, the miR-380-5p mimic transfection singnificantly inhibited the proliferation (P<0.05) and migration ability of C33A cells (P<0.01), and down-regulated protein expressions of RHOA, ROCK1, ROCK2, CDK2 and N-cadherin (all P<0.01). Bioinformatics software predicted that RHOA may be a downstream gene of miR-380-5p, and dual luciferase reporter assay proved the specific binding of miR-380-5p to the 3'UTR of RHOA (P<0.01). miR-380-5p could significantly down-regulate RHOA gene expression (P<0.01). Conclusion: miR-380-5p is low-expressed in cervical cancer cell lines. Over-expression of miR-380-5p may inhibit the proliferation and migration of cervical cancer C33A cells by down-regulating the expression of RHOA gene and its downstream proteins.