摘要
目的:探讨miR-26b在肺癌组织中的表达及miR-26b在肺癌细胞侵袭和迁移过程中的作用及其机制。方法:q PCR检测肺癌和正常肺组织中miR-26b的表达情况;荧光素酶报告基因检测miR-26b与人平衡核苷转运蛋白1(human equilibrative nucleoside transporter 1,hENT1)的相互作用;Transwell侵袭试验检测miR-26b的表达对肺癌细胞侵袭能力的影响;划痕试验检测miR-26b的表达对肺癌细胞迁移能力的影响;Western印迹检测h ENT1,ROCK-1,Rho A蛋白的表达情况;鬼笔环肽染色观察miR-26b-mimic处理后细胞骨架的变化情况;裸鼠皮下成瘤试验检测miR-26b-mimic对肺癌成瘤大小及体积的影响。结果:与正常肺组织相比,肺癌组织中miR-26b表达明显降低;且晚期、低分化和有淋巴结转移的肺癌组织miR-26b表达明显较早期、高分化和无淋巴结转移的肺癌组织低;miR-26b能与h ENT1的3'-UTR特异性结合;miR-26b可以调控肺癌A549细胞的侵袭迁移能力;过表达miR-26b可以抑制h ENT1,ROCK-1,Rho A的表达;miR-26b-mimic处理后,F-actin染色明显减少,细胞膜皱褶形成明显减少,伪足形成明显减少;裸鼠皮下成瘤试验显示:miR-26b-mimic处理后肿瘤体积和质量明显减小。结论:MiR-26b在肺癌中表达明显降低,且跟肺癌分期、分级及淋巴结转移与否密切相关,同时靶向h ENT1通过Rho A/ROCK-1信号通路调控肺癌细胞的侵袭和迁移。
Objective： To investigate the effect of miR-26b on the invasion and migration of lung cancer cell and to explore its mechanism.Methods： qPCR was used to detect the expression of miR-26b in lung cancer. Luciferase reporter gene was used to detect interaction between miR-26b and hENT1. Transwell assay was used to detect invasion ability after treatment of miR-26b mimics. Scratch assay was used to detect migration ability after treatment of miR-26b mimics. The expressions of hENT1, ROCK-1 and RhoA were detected by Western blot. The changes of cytoskeleton after miR-26b mimics treatment with phalloidin were observed. The effect ofmiR-26b mimics on the tumor size and volume of lung cancer was determined by subcutaneous tumor formation in nude mice. Results： MiR-26b expression was significantly reduced in lung cancer. With the progress of lung cancer, the expression ofmiR-26b was reduced. With the progress in differentiation of lung cancer, the expression of miR-26b was decreased. Decrease of miR-26b was associated with lung cancer lymph node metastasis. HENT1 was the direct target of miR-26b; miR-26b regulated the invasion and migration ability of human lung carcinoma A549 cells. MiR-26b regulated the expression of hENT1, ROCK-1 and RhoA. After the treatment with miR-26b mimics, the F-actin staining was significantly reduced, whereas the formation of wrinkles and the formation of pseudopodia were significantly reduced. Subcutaneous tumor formation in nude mice showed that miR-26b mimics treatment significantly reduced the tumor size and mass. Conclusion： MiR-26b plays a role in tumor suppression in lung cancer, miR-26b can regulate the invasion and migration ability of lung carcinoma A549 cells by targeting hENT1 depending on the RhoA/ROCK- 1 pathway.
出处
《中南大学学报（医学版）》
CAS
CSCD
北大核心
2017年第7期755-761,共7页
Journal of Central South University ：Medical Science
基金
四川省卫生厅科研课题(120116)~~
