miR-133b通过下调转胶蛋白抑制食管鳞癌细胞的增殖和侵袭能力  

MicroRNA-133b suppresses cell proliferation and invasion of esophageal squamous cell carcinoma via downregulating TAGLN2 expression

作　　者：汤喻[1] 刘军豪[1] 史祖宣[2] 李珍[2] 刘红涛 鲁平[1] Tang Yu;Liu Junhao;Shi Zuxuan;Li Zhen;Liu Hongtao;Lu Ping(Department of Endocrinology, Henan Provincial People′s Hospital, Fuwai Central China Cardiovascular Hospital, Zhengzhou 450003, China;Department of Medical Oncology, Henan Provincial People′s Hospital, Zhengzhou 450003, China;College of Life Sciences, Zhengzhou University, Zhengzhou 450001, China)

机构地区：[1]河南省人民医院阜外华中心血管病医院内分泌科,郑州450003 [2]河南省人民医院阜外华中心血管病医院肿瘤内科,郑州450003 [3]郑州大学生命科学学院,450001

出　　处：《中华肿瘤杂志》2019年第2期91-96,共6页Chinese Journal of Oncology

基　　金：河南省自然科学基金项目(182300410377);河南省高等学校重点科研项目(17A180016).

摘　　要：目的观察miR-133b在食管鳞癌中的表达,并探讨其对食管鳞癌细胞增殖和侵袭能力的影响及分子机制。方法采用实时荧光定量PCR方法检测63例食管鳞癌组织及对应的癌旁组织、食管鳞癌细胞(Eca109、EC9706、EC1、TE1、KYSE70)和正常食管上皮细胞Het-1A中miR-133b的表达。将miR-133b类似物、miR-133b抑制剂及阴性对照转染TE1细胞,分别采用细胞计数试剂盒8(CCK-8)法和Transwell小室实验检测miR-133b对TE1细胞增殖和侵袭能力的影响。采用TargetScan和miRDB在线软件预测miR-133b的靶基因,并利用双荧光素酶报告载体证实其潜在的靶基因。采用Western blot方法检测miR-133b过表达对转胶蛋白2(TAGLN2)及上皮-间充质转化(EMT)相关蛋白上皮型钙黏附素(E-cadherin)、神经型钙黏附素(N-cadherin)、Snail、Slug和波形蛋白(Vimentin)表达的影响。结果63例食管鳞癌组织miR-133b的相对表达水平为0.295±0.040,显著低于正常癌旁组织(1.002±0.011,P<0.001)。miR-133b mRNA的表达与食管鳞癌分期、淋巴结转移和预后均有关。食管鳞癌细胞Eca109、EC9706、EC1、TE1和KYSE70中miR-133b的相对表达水平分别为0.679±0.031、0.391±0.008、0.236±0.016、0.031±0.005和0.099±0.020,均显著低于正常食管上皮细胞Het-1A(1.005±0.016,均P<0.001)。miR-133b类似物转染能上调TE1细胞中的miR-133b水平达6.199±0.627,并抑制TE1细胞的增殖和侵袭能力,而miR-133b抑制剂转染能下调TE1细胞中的miR-133b水平至0.182±0.023,并增强TE1细胞的增殖和侵袭能力。最为显著的是,TAGLN-3′UTR-WT转染的细胞中,miR-133b类似物转染组的相对荧光素酶的活性(0.320±0.018)显著低于阴性对照组(1.010±0.036,P<0.001);而TAGLN-3′UTR-MUT转染的细胞中,miR-133b类似物转染组和阴性对照组的相对荧光素酶活性分别为1.019±0.056和1.008±0.021,差异无统计学意义(P>0.05)。miR-133b上调能显著抑制食管鳞癌TE1细胞中TAGLN2蛋白的表达,并且上调E-cadObjective To investigate the expression of microRNA-133b (miR-133b) in esophageal squamous cell carcinoma (ESCC), and explore its effect and the underlying molecular mechanisms on cell proliferation and invasion. Methods Real-time quantitative PCR (qPCR) was used to examine miR-133b expression in 63 ESCC tissues and paired adjacent non-cancerous tissues, several ESCC cells (Eca109, EC9706, EC1, TE1, KYSE70) and normal esophageal epithelial cell Het-1A. MiR-133b mimic, inhibitor and negative control (NC) were transfected into TE1 cells. The effect of miR-133b on cell proliferation and invasion were determined by CCK-8 and Transwell assays, respectively. Subsequently, the target gene of miR-133b was predicted by online tools TargetScan and miRDB, which was verified by dual luciferase reporter assays. Finally, Western blot was utilized to detect the effects of miR-133b overexpression on expression of target gene TAGLN2 as well as EMT-related proteins E-cadherin, N-cadherin, Snail, Slug and Vimentin. Results Relative levels of miR-133b in ESCC tissues (0.295±0.040) were significantly lower than those in adjacent non-cancerous tissues (1.002±0.011, P<0.001). The expression of miR-133b was tightly associated with clinical staging, lymph node metastasis and prognosis. Moreover, relative levels of miR-133b in ESCC cells Eca109, EC9706, EC1, TE1 and KYSE70 (0.679±0.031, 0.391±0.008, 0.236±0.016, 0.031±0.005 and 0.099±0.020) were evidently lower than that in normal esophageal epithelial cell Het-1A (1.005±0.016, all P<0.001). In TE1 cells, miR-133b mimic significantly increased the level of miR-133b to 6.199±0.627, and suppressed cell proliferation and invasion, whereas miR-133b inhibitor obviously decreased its expression to 0.182±0.023, and promoted cell proliferation and invasion. Most notably, the relative luciferase activities of miR-133b-mimic group (0.320±0.018) in TE1 cells transfected with TAGLN-3′UTR-WT were markedly lower than that in NC group (1.010±0.036, P<0.001), whereas those in TAGLN-3′UTR-

关 键 词：食管肿瘤 鳞状细胞癌 细胞增殖 细胞侵袭 上皮-间充质转化 MiR-133b 转胶蛋白2 

分 类 号：R735.1[医药卫生—肿瘤]