lncRNA CRNDE通过调控miR-451对乳头状甲状腺癌细胞恶性行为的影响

Effect of lncRNA CRNDE on the malignant behavior of papillary thyroid carcinoma cells through regulating miR-451

目的探讨长链非编码RNA结直肠肿瘤差异表达基因(lncRNA CRNDE)对乳头状甲状腺癌(PTC)恶性进展中的生物学功能及其潜在调节机制。方法收集2019年7月至2021年1月在江苏大学附属人民医院行甲状腺切除手术的30例PTC患者的癌和癌旁组织标本,另外选择人甲状腺癌细胞系(TPC-1和BCPAP)和人甲状腺正常细胞(Nthy-ori 3-1)作为靶细胞。实时定量聚合酶链反应(qPCR)检测PTC癌和癌旁组织及细胞系中lncRNA CRNDE和微小RNA(miR)-451的表达。将TPC-1和BCPAP细胞随机分为对照(Ctrl)组,lncRNA CRNDE过表达(lncRNA CRNDE-OE)组和lncRNA CRNDE敲除(lncRNA CRNDE-siRNA)组。CCK-8法检测细胞增殖活性;Transwell法检测细胞侵袭和迁移;流式细胞术检测细胞凋亡;Western blot检测N-钙黏蛋白(N-cadherin),波形蛋白(Vimentin)和E-钙黏蛋白(E-cadherin)蛋白表达;荧光素酶报告实验分析lncRNA CRNDE与miR-451基因的靶向关系。结果与癌旁组织相比,癌组织中lncRNA CRNDE表达增多,miR-451表达降低(P<0.001);与Nthy-ori 3-1细胞相比,TPC-1和BCPCP细胞中lncRNA CRNDE表达上调,miR-451表达下调(P<0.001)。与Ctrl组相比,lncRNA CRNDE-OE组BCPAP和TPC-1细胞存活率,侵袭率和迁移率均升高,细胞凋亡率降低,E-cadherin蛋白表达减少,N-cadherin和Vimentin蛋白表达升高,miR-451表达降低(P<0.01);而lncRNA CRNDE-siRNA组细胞存活率,侵袭率和迁移率均降低,细胞凋亡率升高,E-cadherin蛋白表达增多,N-cadherin和Vimentin蛋白表达降低(P<0.01);双荧光素酶报告实验显示,lncRNA CRNDE与miR-451具有明显的靶向关系。结论PTC癌组织中lncRNA CRNDE高表达,可能通过靶向抑制miR-451表达促进PTC细胞增殖、迁移、侵袭和上皮-间充质转化发生,并抑制细胞凋亡。

Objective To investigate the biological function of long-stranded non-coding RNA colorectal tumor differentially expressed gene(lncRNA CRNDE)in the malignant progression of papillary thyroid carcinoma(PTC)and its potential regulatory mechanisms.Methods Cancer and paracancerous tissue specimens from totally 30 PTC patients who underwent thyroidectomy at the Affiliated People's Hospital of Jiangsu University from July 2019 to January 2021 were collected,and human thyroid cancer cell lines(TPC-1 and BCPAP)and normal human thyroid cells(Nthy-ori 3-1)were additionally selected as the target cells.Real time quantitative polymerase chain reaction(qPCR)was performed to detect the expression of lncRNA CRNDE and microRNA(miR)-451 in PTC cancer,paracancerous tissues,and cell lines.TPC-1 and BCPAP cells were randomly divided into control(Ctrl)group,lncRNA CRNDE overexpression(lncRNA CRNDE-OE)group and lncRNA CRNDE knockdown(lncRNA CRNDE-siRNA)group.CCK-8 method was used to detect cell proliferation activity.Transwell method was used to detect cell invasion and migration.Flow cytometry was used to detect cell apoptosis.Western blot was used to detect N-cadherin,vimentin,and E-cadherin protein ex-pression.The luciferase reporter assay was used to analyze the targeting relationship between lncRNA CRNDE and miR-451 gene.Results lncRNA CRNDE expression was increased and miR-451 expression was decreased in cancer tissues compared with paracancerous tissues(P<0.001);lncRNA CRNDE expression was up-regulated and miR-451 expression was down-regulated in TPC-1 and BCPCP cells compared with Nthy-ori 3-1 cells(P<0.001).Compared with the Ctrl group,BCPAP and TPC-1 cells in the lncRNA CRNDE-OE group showed increased survival,invasion and migration rates,decreased apoptosis,decreased E-cadherin pro-tein expression,elevated N-cadherin and Vimentin protein expression,and decreased miR-451 expression(P<0.01),whereas in the lncRNA CRNDE-siRNA group,cell survival,invasion rate and migration rate were de-creased,apoptosis rate was elevated,E-cadherin protein expression was increased,and N-cadherin and Vimen-tin protein expression was decreased(P<0.01).Dual luciferase reporter assay showed that lncRNA CRNDE had obvious targeting relationship with miR-451.Conclusion lncRNA CRNDE is highly expressed in PTC cancer tissues,which may promote PTC cell proliferation,migration,invasion,epithelial mesenchymal transi-tion,and inhibit cell apoptosis by targeting miR-451 expression inhibition.