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Title: [Effects of microRNA-182-5p on cell proliferation and invasion of esophageal squamous cell carcinoma and related molecular mechanisms].
Author: Zhu ZQ, Hu HF, Zheng XY, Wang F.
Journal: Zhonghua Zhong Liu Za Zhi; 2020 Aug 23; 42(8):635-643. PubMed ID: 32867454.
Abstract:
Objective: To investigate the effects of microRNA-182-5p (miR-182-5p) on cell proliferation and invasion of esophageal squamous cell carcinoma (ESCC) and its related molecular mechanisms. Methods: Real-time quantitative polymerase chain reaction (RT-qPCR) was employed to detect the miR-182-5p expression in ESCC tissues and cells. MiR-182-5p inhibitor, miR-182-5p mimic and negative control (NC) were transfected into ESCC Eca109 and TE1 cells, and miR-182-5p expression after transfection was examined using RT-qPCR. Cell counting kit-8 (CCK-8) was utilized to investigate the cell proliferation and Transwell chamber was used to detect the cell invasion ability. Dual-luciferase reporter assay was used to detect the direct interaction of miR-182-5p and cell adhesion molecule 2 (CADM2), RT-qPCR was employed to detect CADM2 expression in ESCC tissues, the correlation between CADM2 and miR-182-5p was also examined. Finally, western blot was used to detect the protein expressions of CADM2, focal adhesion kinase (FAK), p-Akt and Akt after transfection. Results: The miR-182-5p level in ESCC tissues was (2.180±1.295), significantly higher than (0.890±0.284) in normal esophageal epithelial tissues (P<0.001). The survival ratio of ESCC patients with high miR-182-5p level was evidently lower than that of ESCC patients with low miR-182-5p level (P<0.05). MiR-182-5p expression was significantly associated with TNM staging and lymph node metastasis (P<0.05). The expressions of miR-182-5p in ESCC cells including EC9706, Eca109, TE1, KYSE450 and KYSE70 were (2.449±0.082), (2.965±0.088), (4.873±0.258), (1.338±0.045) and (1.999±0.082), respectively, obviously higher than (0.989±0.087) in normal esophageal epithelial cell Het-1A (all P<0.01). Besides, miR-182-5p inhibitor significantly downregulated the miR-182-5p expression in Eca109 and TE1, and suppressed cell proliferation and invasion ability. Conversely, miR-182-5p mimic significantly upregulated the miR-182-5p expression in Eca109 and TE1, and promoted cell proliferation and invasion ability. Dual-luciferase reporter assay revealed that co-transfection of CADM2-3'UTR-WT and miR-182-5p mimic significantly reduced the luciferase activities in Eca109 and TE1 cells (P<0.01), and CADM2 was the direct target of miR-182-5p. The expression of CADM2 in ESCC tissues was (0.190±0.143), markedly lower than (0.845±0.327) in normal esophageal epithelial tissues (P<0.001). The miR-182-5p level exhibited negative correlation with CADM2 level in ESCC tissues (r=-0.5004, P<0.001). In addition, CADM2 expression was closely correlated with TNM staging and lymph node metastasis (P<0.05). The survival ratio of ESCC patients with high CADM2 level was evidently higher than that of ESCC patients with low CADM2 level (P<0.05). MiR-182-5p inhibitor significantly upregulated the expression of CADM2 protein, but suppressed the protein expressions of FAK, p-Akt and Akt, whereas miR-182-5p mimic markedly downregulated the expression of CADM2 protein, but promoted the protein expressions of FAK, p-Akt and Akt. Conclusion: MiR-182-5p is implicated in the carcinogenesis and development of ESCC, and thus may be a potential molecular target for ESCC patients. 目的： 探讨miR-182-5p对食管鳞癌(ESCC)细胞增殖和侵袭的影响，并探讨其可能的分子机制。 方法： 采用实时荧光定量聚合酶链反应(RT-qPCR)检测ESCC组织和细胞中miR-182-5p的表达。将miR-182-5p抑制剂、miR-182-5p模拟物及阴性对照转染食管鳞癌Eca109和TE1细胞，RT-qPCR检测转染后ESCC细胞中miR-182-5p的表达水平，细胞计数试剂盒8(CCK-8)法检测ESCC细胞的增殖能力，Transwell小室法检测ESCC细胞的侵袭能力。双荧光素酶报告实验分析miR-182-5p与细胞黏附分子2(CADM2)的相互作用，RT-qPCR检测ESCC组织中CADM2的表达，并分析其与miR-182-5p表达的相关性。Western blot检测转染后CADM2、粘着斑激酶(FAK)、p-Akt和Akt蛋白的表达。 结果： ESCC组织中miR-182-5p的相对表达水平为2.180±1.295，显著高于正常组织(0.890±0.284，P<0.001)。miR-182-5p高表达ESCC患者的生存率低于低表达患者(P<0.05)。ESCC组织中miR-182-5p的表达与ESCC的TNM分期和淋巴结转移有关关(均P<0.05)。ESCC细胞EC9706、Eca109、TE1、KYSE450和KYSE70中miR-182-5p的相对表达水平分别为2.449±0.082、2.965±0.088、4.873±0.258、1.338±0.045和1.999±0.082，均高于正常食管上皮细胞Het-1A(0.989±0.087，均P<0.01)。miR-182-5p抑制剂组Eca109和TE1细胞中miR-182-5p的表达下调，细胞的增殖和侵袭能力降低，而miR-182-5p模拟物组Eca109和TE1细胞中miR-182-5p的表达上调，细胞的增殖和侵袭能力增强。双荧光素酶报告实验显示，在CADM2 3′非翻译区-野生型载体和miR-182-5p模拟物共转染后，Eca109和TE1细胞中荧光素酶的活性显著降低(P<0.01)，CADM2是miR-182-5p的直接作用靶点。ESCC组织中CADM2 mRNA的相对表达水平为0.190±0.143，显著低于正常组织(0.845±0.327，P<0.001)。ESCC组织中miR-182-5p和CADM2的表达呈负相关(r＝-0.5004，P<0.001)。ESCC组织中CADM2表达与ESCC的TNM分期和淋巴结转移均密切相关(P<0.05)。CADM2高表达ESCC患者的生存率高于低表达患者(P<0.05)。miR-182-5p抑制剂组CADM2蛋白表达上调，FAK、p-Akt和Akt蛋白表达下调，而miR-182-5p模拟物组CADM2蛋白表达下调，FAK、p-Akt和Akt蛋白表达上调。 结论： miR-182-5p参与ESCC的发生发展过程，有望成为ESCC潜在的分子治疗靶点。.

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