miR-506通过调控MCL-1抑制耐阿立替尼非小细胞肺癌A549细胞上皮间质转化的作用机制

目的:探究miR-506通过调控MCL-1对耐阿立替尼非小细胞肺癌A549细胞上皮间质转化（epithelial mesenchymal transformation,EMT）及侵袭转移的影响和作用机制。方法:收集2017年12月至2018年12月我院肿瘤科收治的经PET-CT结合组织病理活检及药敏试验确诊为耐阿立替尼的74例非小细胞肺癌患者的癌及癌旁组织以及人非小细胞肺癌A549细胞为研究对象,分别采用细胞转染、免疫组化染色（IHC）、qRT-PCR和Western Blot法检测上述临床组织和细胞样本中miR-506、MCL-1、BAX/Bcl-2凋亡信号途径及EMT标志蛋白表达水平;此外,采用Transwell细胞实验观察miR-506过表达和MCL-1敲减对A549细胞迁移和侵袭能力的影响。结果:免疫组化（IHC）结果显示肺癌患者癌组织中浸润性坏死性病理损伤较癌旁组织明显加重,且癌组织中MCL-1的阳性表达率为94.64%,明显高于癌旁组织的23.27%（P＜0.05）。qRT-PCR和Western Blot结果显示,肺癌组织中miR-506、BAX和E-cadherin的表达明显低于癌旁组织,而MCL-1、Bcl-2和N-cadherin的表达显著高于癌旁组织（P＜0.05）。细胞实验结果表明miR-506过表达和MCL-1敲减能够明显上调BAX和E-cadherin的表达,同时抑制Bcl-2和N-cadherin的表达（P＜0.05）;此外,miR-506过表达和MCL-1敲减均能显著抑制肺癌A549细胞的迁移和侵袭能力（P＜0.05）。结论:miR-506可能通过抑制BAX/Bcl-2/MCL-1凋亡途径发挥抑制耐阿立替尼非小细胞肺癌A549细胞EMT及诱导细胞凋亡作用,有望为临床抗肺癌转移及凋亡抑制靶向治疗提供新分子和靶点。     

MiR-218通过抑制Robo1的表达影响肺癌细胞迁移侵袭

背景与目的 本研究旨在探讨肺癌中miR-218的表达,研究miR-218在肺癌细胞中的功能及其可能的分子机制.方法 应用实时荧光定量PCR(qRT-PCR)检测15例肺癌组织和15例癌旁组织中miR-218的表达.在肺癌细胞A549中转染miR-218的抑制物(Anti-miR-218),在肺癌细胞HCC4006中转染miR-218的模拟物后,用Transwell实验检测细胞的迁移侵袭能力的变化.用Targetscan和MiRanda软件预测miR-218的可能靶点,转染miR-218的抑制物及模拟物后用qRT-PCR和Western blot检测Robo1的mRNA和蛋白表达水平.用双荧光素酶报告基因方法鉴定miR-218和Robo1的调控关系.用Anti-miR-218、miR-218模拟物或阴性对照与Si-Robo1或Si-NC同时转染细胞,应用Transwell实验检测转染后细胞的侵袭迁移能力的变化.结果 与癌旁组织比较,肺癌组织中miR-218在肺癌组织中表达水平显著降低(P<0.01).在A549细胞中转染miR-218的抑制物,能够显著降低miR-218的表达,促进了细胞的迁移侵袭.在HCC4006中转染miR-218的模拟物能够显著提高miR-218的表达,同时抑制了细胞的迁移侵袭能力.利用生物信息学预测出在Robo1的3′UTR区有miR-218的结合位点,双荧光素酶报告基因实验进一步证实miR-218能够调控Robo1的转录活性.抑制miR-218能够提高Robo1的表达;过表达miR-218显著降低Robo1的表达,且miR-218能够通过调控Robo1影响细胞的迁移侵袭.结论 MiR-218在肺癌组织中呈现低表达状态,miR-218可能是通过抑制Robo1的表达抑制肺癌细胞侵袭迁移.     

miR-323a-3p通过靶向结合TM4SF1而调控NSCLC A549细胞的增殖、迁移和侵袭

目的:探究miR-323a-3p、四次穿膜蛋白超家族成员1(TM4SF1)在NSCLC组织和细胞中的表达及两者间的靶向调控关系,观察两者表达对A549细胞增殖、迁移、侵袭和裸鼠移植瘤生长的影响。方法:收集2014年1月至12月间青海省人民医院手术切除的20例NSCLC组织及其相应的癌旁组织,qPCR和WB法检测癌组织中miR-323a-3p、TM4SF1 mRNA和TM4SF1蛋白的表达。向A549细胞转染miR-323a-3p mimic,采用MTT法、Transwell法、WB法检测miR-323a-3p过表达对细胞的增殖、迁移和侵袭以及TM4SF1、细胞周期蛋白D1(cyclin D1)、p21、MMP-2、MMP-9蛋白表达的影响。采用生物信息学预测工具StarBase和双荧光素酶报告基因实验分析miR-323a-3p与TM4SF1靶向关系。将si-TM4SF1转染至A549细胞,以及分别将miR-323a-3p mimic与pcDNA或pcDNA-TM4SF1共转染A549细胞,评估细胞增殖、迁移和侵袭能力的变化;同时建立各组细胞的BALB/c裸鼠移植瘤模型,在14、21和2...     

肺癌miR-146a表达及其对细胞增殖、侵袭及迁移的影响

目的探讨微小RNA-146a(miR-146a)在肺癌组织和细胞中的表达和甲基化状态,及其对A549细胞增殖、侵袭、迁移的影响及可能机制。方法收集2018年1月至2019年4月在我院行根治性手术的非小细胞肺癌组织和对应癌旁组织,实时荧光定量PCR(QPCR)和甲基化特异性PCR(MSP)检测miR-146a的表达水平和甲基化状态,并分析甲基化状态与肺癌临床病理特征的关系。采用5-氮杂-2’-脱氧胞苷(5-AZA-2’-dC)处理A549细胞(处理组),MTT、Transwell实验和划痕实验检测处理组细胞增殖、侵袭和迁移活性。采用Western blotting检测Notch1和发状分裂相关增强子1(Hes-1)蛋白表达。结果肺癌组织和A549细胞中miR-146a表达量分别为0.63±0.28、0.85±0.11,均低于癌旁正常组织和BEAS-2B细胞(P<0.05)。MSP检测显示肺癌组织miR-146a甲基化率为62.5%(50/80),高于癌旁组织(P<0.05);miR-146a甲基化状态与肿瘤直径、TNM分期、淋巴结转移有关(P<0.05)。处理组细胞miR-146a表达水平为2.15±0.48,高于空白对照组(P<0.05);处理组细胞增殖、侵袭和迁移活性均低于空白对照组(P<0.05)。处理组Notch1蛋白和Hes-1蛋白表达水平分别为0.24±0.05和0.22±0.06,均低于空白对照组(P<0.05)。结论启动子异常甲基化导致在肺癌组织和细胞中miR-146a表达量降低,可能通过减弱对Notch1/Hes-1信号通路的抑制作用,促进肺癌细胞增殖、侵袭和转移,miR-146a有望成为肺癌新的生物治疗靶点。     

The novel miR-9501 inhibits cell proliferation,migration and activates apoptosis in non-small cell lung cancer

Accumulating evidences suggest that lots of microRNAs (miRNAs) play crucial roles in (patho-)physiological processes of lung cancer, including metastasis, drug-resistance or tumorigenesis. They mediate the progression of cell growth, migration and invasion by regulating the expression of special genes. MiRNA expression patterns could also serve as diagnostic/prognostic biomarkers. Cancer therapies mediated by miRNAs remain tremendous potential and challenges. Our previous small RNA-seq assay found that the novel miR-9501 was down-regulated in lung cancer tissues compared with adjacent non-cancer tissues. In this study, our results verified that miR-9501 was significantly down-regulated in lung cancer tissues and its expression levels were remarkably suppressed in non-small cell lung cancer cell lines. Then, we characterized and investigated the novel miR-9501 in A549 cells. Transient transfection of miR-9501 into cultured A549 cells led to remarkable decrease in cell proliferation, migration and increase apoptosis. These data demonstrated that miR-9501 might be a tumor suppressor for lung cancer therapy.     

miR-601靶向调控MMP-17抑制非小细胞肺癌的迁移和侵袭CSCD

目的探讨miR-601对非小细胞肺癌(NSCLC)迁移和侵袭能力的影响并探讨其可能的作用机制。方法RT-qPCR检测NSCLC组织中miR-601的表达,并分析表达水平与癌细胞侵袭和淋巴结转移的相关性。将miR-601 mimics瞬时转染A549细胞或H1299细胞,Transwell实验检测其对两种细胞迁移和侵袭能力的影响。生物信息学预测miR-601相关靶基因,采用双荧光素酶实验进行靶基因验证。检测miR-601的靶基因对A549细胞或H1299细胞迁移及侵袭能力的影响。结果miR-601在NSCLC组织中表达明显降低(P<0.001),且降低水平与癌细胞的浸润(P<0.007)及淋巴结转移(P<0.011)密切相关。瞬时转染miR-601 mimics能明显抑制A549细胞或H1299细胞的迁移及侵袭能力。生物信息学及荧光素酶报告实验提示MMP-17是miR-601的靶基因。MMP-17能促进A549细胞或H1299细胞的迁移和侵袭,但其促进迁移侵袭的能力可被miR-601抑制。结论miR-601通过靶向调控MMP-17而抑制非小细胞肺癌的迁移和侵袭。     

Testin在非小细胞肺癌组织和细胞株中的表达及其对癌细胞恶性生物学行为的影响

目的:探讨Testin基因(TES)在非小细胞肺癌(NSCLC)组织和细胞株中的表达及其对人肺癌A549细胞增殖、迁移、侵袭和凋亡的影响.方法:收集2015年1月至2015年12月在华中科技大学同济医学院附属同济医院手术切除的27例NSCLC患者的癌组织及癌旁组织标本,用Western blotting法检测癌组织和癌旁组织,以及正常人胚肺成纤维细胞株MRC5和肺癌细胞株A427、A549、H1299、LK2、PC9和SW900中TES蛋白的表达水平.应用短发卡RNA(shRNA)瞬时转染肺癌细胞株A549干扰TES基因的表达,并进一步检测TES低表达对A549细胞增殖、迁移、侵袭以及凋亡的影响,同时检测凋亡相关蛋白Bax、Bcl-2和Cas-pase-3的表达.结果:在NSCLC组织和细胞株中TES蛋白的表达明显下降(均P＜0.05).shTES干扰A549细胞后,TES mRNA和蛋白表达水平均显著下降(均P＜0.05).抑制TES表达显著增强A549细胞的增殖[(2.75±0.04) vs (1.79±0.06),P＜0.05]、迁移[(52.3±2.6)％s(19.7±1.4)%,P＜0.05]和侵袭能力[(31.2±3.9)％vs(14.5±4.1)％,P＜0.05],同时降低了细胞凋亡率[(8.2±1.1)％s(23.1±1.7)％,P＜0.05].TES低表达使A549细胞Bax和Caspase-3蛋白表达明显下降(P＜0.05)、Bcl-2蛋白表达明显升高(P＜0.05).结论:TES在NSCLC组织中呈低表达,TES表达下调具有促进肺癌细胞的增殖、迁移、侵袭并抑制凋亡等生物学效应,其有可能成为肺癌治疗一个新靶点.     

Propofol Inhibits Lung Cancer A549 Cell Growth and Epithelial–Mesenchymal Transition Process by Upregulation of MicroRNA-1284

Propofol has been widely used in lung cancer resections. Some studies have demonstrated that the effects of propofol might be mediated by microRNAs (miRNAs). This study aimed to investigate the effects and mechanisms of propofol on lung cancer cells by regulation of miR-1284. A549 cells were treated with different concentrations of propofol, while transfected with miR-1284 inhibitor, si-FOXM1, and their negative controls. Cell viability, migration, and invasion, and the expression of miR-1284, FOXM1, and epithelial–mesenchymal transition (EMT) factors were detected by CCK-8, Transwell, qRT-PCR, and Western blot assays, respectively. In addition, the regulatory and binding relationships among propofol, miR-1284, and FOXM1 were assessed, respectively. Results showed that propofol suppressed A549 cell viability, migration, and invasion, upregulated E-cadherin, and downregulated N-cadherin, vimentin, and Snail expressions. Moreover, propofol significantly promoted the expression of miR-1284. miR-1284 suppression abolished propofol-induced decreases of cell viability, migration, and invasion, and increased FOXM1 expression and the luciferase activity of FOXM1-wt. Further, miR-1284 negatively regulated FOXM1 expression. FOXM1 knockdown reduced cell viability, migration, and invasion by propofol treatment plus miR-1284 suppression. In conclusion, our study indicated that propofol could inhibit cell viability, migration, invasion, and the EMT process in lung cancer cells by regulation of miR-1284.     

miR-615 Inhibits Prostate Cancer Cell Proliferation and Invasion by Directly Targeting Cyclin D2

Previous studies have reported that miR-615 exerts a tumor suppressor role in some tumors, such as esophageal squamous cell carcinoma and non-small cell lung cancer. However, the role of miR-615 in prostate cancer has not been defined. Here we found that miR-615 was downregulated in prostate cancer tissues and cell lines. Overexpression of miR-615 in PC-3 cells significantly inhibited cellular proliferation, migration, and invasion. Moreover, overexpression of miR-615 delayed tumor growth in vivo. In terms of mechanism, we found that cyclin D2 (CCND2) is a target gene of miR-615 in prostate cancer. We showed that miR-615 could bind to the 3 -UTR region of CCND2 mRNA and inhibit its expression. There was a negative correlation between the expression of miR-615 and CCND2 in prostate cancer tissues. Moreover, restoration of cyclin D2 abolished the inhibitory effects of miR-615 on the proliferation, migration, and invasion of prostate cancer cells. Taken together, our study identified miR-615 as a tumor suppressor by targeting cyclin D2 in prostate cancer.     

Roles of microRNA-206 in Osteosarcoma Pathogenesis and Progression

Backgroud and Aims: MicroRNA-206 has proven to be down-regulated in many human malignancies incorrelation with tumour progression. Our study aimed to characterize miR-206 contributions to initiationand malignant progression of human osteosarcoma. Methods: MiR-206 expression was detected in humanosteosarcoma cell 1ine MG63, human normal osteoblastic cell line hFOB 1.19, and paired osteosarcoma andnormal adjacent tissues from 65 patients using quantitative RT-PCR. Relationships of miR-206 levels toclinicopathological characteristics were also investigated. Moreover, miR-206 mimics and negative control siRNAwere transfected into MG63 cells to observe effects on cell viability, apoptosis, invasion and migration. Results:We found that miR-206 was down-regulated in the osteosarcoma cell line MG63 and primary tumor samples,and decreased miR-206 expression was significantly associated with advanced clinical stage, T classification,metastasis and poor histological differentiation. Additionally, transfection of miR-206 mimics could reduce MG-63 cell viability, promote cell apoptosis, and inhibit cell invasion and migration. Conclusions: These findingsindicate that miR-206 may have a key role in osteosarcoma pathogenesis and development. It could serve as auseful biomarker for prediction of osteosarcoma progression, and provide a potential target for gene therapy.     

miR-374 a对肺腺癌细胞增殖与侵袭迁移的影响

目的 探究分析miR-374a对非小细胞肺癌细胞增殖、侵袭、迁移等生物学行为能力的影响.方法 采用RT-PCR检测miR-374a在正常肺上皮细胞CCD-8L及非小细胞肺癌细胞A549、H1975中的表达情况.采用miR-374a mimic和miR-374a inhibitor转染非小细胞肺癌细胞A549、H1975...     

miR-148a 靶向HMGB3抑制非小细胞肺癌细胞迁移、侵袭和增强顺铂抗肿瘤效应的机制研究

目的:探讨miR-148a靶向HMGB3抑制非小细胞肺癌细胞迁移和侵袭的作用机制。方法:采用RT-qPCR和Western blot检测非小细胞肺癌组织和癌旁组织标本中miR-148a和HMGB3相对表达水平;以A549、H1299细胞为研究对象,Transwell和MTT法分别检测过表达miR-148a、敲低HMGB3和DDP干预对细胞迁移、侵袭及细胞活力的影响;TargetScan在线预测、双荧光素酶报告基因实验和Western blot验证miR-148a与HMGB3的靶向关系;miR-148a过表达或敲减HMGB3并联合DDP,Transwell和MTT法检测细胞迁移、侵袭和细胞活力。结果:非小细胞癌组织中miRNA-148a表达明显下调（P<0.05）,HMGB3在mRNA和蛋白水平表达均明显上调（P<0.05）,miR-148a与HMGB3表达呈负相关（r=-0.856 8,P<0.000 1）;过表达miR-148a或敲低HMGB3能明显抑制细胞迁移和侵袭（P<0.05）,过表达miR-148a或敲低HMGB3联合DDP干预,细胞活力明显下降（P<0.05）;TargetScan在线预测、双荧光素酶报告基因实验和Western blot检测表明miR-148a能调控HMGB3表达。结论:miR-148a在非小细胞肺癌组织中表达下调,HMGB3是miR-148a的靶基因,过表达miR-148a能抑制HMGB3表达从而抑制非小细胞肺癌细胞A549、H1299迁移和侵袭并增强顺铂抗肿瘤效应。     

miR-769-5p在非小细胞肺癌中的表达及其对细胞增殖、迁移与侵袭能力的影响

目的 探讨微小RNA-769-5p （miR-769-5p） 在非小细胞肺癌（NSCLC）细胞株中的表达及其对细胞增殖、迁移和侵袭能力的影响。方法 采用实时荧光定量PCR（QPCR）技术检测miR-769-5p 在5种NSCLC细胞（A549、NCI-H1299、NCI-H157、ANIP-973和GLC-82）中的相对表达量,选择相对表达量最低和最高的细胞株分别转染miR-769-5p mimics／miR-769-5p inhibitor,另设miRNA mimics control／inhibitor control对照组;采用MTS 实验、克隆形成实验及Transwell 小室实验检测miR-769-5p对NSCLC 细胞增殖、克隆形成、侵袭和迁移能力的影响。结果 miR-769-5p在A549、NCI-H1299、NCI-H157、ANIP-973 及GLC-82细胞中的相对表达量分别为 0.06、0.40、0.09、1.04和2.31。在miR-769-5p表达水平最低的A549细胞中瞬时转染miR-769-5p mimics,在miR-769-5p表达水平最高的GLC-82细胞中瞬时转染miR-769-5p inhibitor。MTS结果显示,与对照组比较,miR-769-5p mimics 能够抑制A549细胞的增殖 （P＜0.05）,而miR-769-5p inhibitor能够促进GLC-82细胞的增殖 （P＜0.05）。平板克隆实验结果显示,与对照组比较,miR-769-5p mimics 能够抑制A549细胞的平板克隆形成数 （124.7±14.7 vs. 399.4±46.0,P＜0.05）;而miR-769-5p inhibitor能够促进GLC-82细胞的平板克隆形成数 （555.7±29.7 vs. 366.3±28.7,P＜0.05）。Transwell实验结果显示,与对照组迁移和侵袭跨膜细胞数比较,miR-769-5p mimics能够抑制A549细胞的迁移和侵袭 （94.4±18.1 vs. 157.8±22.9,84.4±15.1 vs. 135.6±16.7,P＜0.05）;miR-769-5p inhibitor能够促进GLC-82细胞的迁移和侵袭 （226.7±40.3 vs. 153.3±38.7,196.7±39.1 vs. 138.9±40.4,P＜0.05）。结论 miR-769-5p可以抑制NSCLC细胞的增殖、侵袭和迁移,可能成为NSCLC的潜在靶点。     

miR-940在非小细胞肺癌中的表达及对肺腺癌A549细胞生物学功能的影响北大核心

目的:探讨miR-940在非小细胞肺癌中的表达及对肺腺癌A549细胞增殖、迁移、侵袭的影响。方法:选取标本库中2015年10月至2016年12月在我院胸外二科行手术治疗的非小细胞肺癌患者85例,检测癌组织和癌旁组织中miR-940的表达水平。将miR-940 mimics和miR-940 inhibitors转染至A549细胞中,检测转染后各组A549细胞中miR-940的表达水平。根据细胞增殖实验、划痕实验和Transwell实验检测各组细胞的增殖、迁移及侵袭能力变化。双荧光素酶实验证实miR-940的靶基因。结果:miR-940在癌组织中的表达量显著低于癌旁组织中的表达量,差异有统计学意义(P=0.004)。细胞增殖实验结果显示,miR-940 mimics组的细胞增殖率显著低于miR-940 inhibitors组(P<0.05);细胞划痕实验结果显示,miR-940 mimics组的划痕愈合率明显低于miR-940 inhibitors组(P<0.05);Transwell细胞侵袭实验结果显示,miR-940 mimics组的侵袭细胞数显著低于miR-940 inhibitors组的侵袭细胞数,差异有统计学意义(P<0.01)。Cbl-b是miR-940的直接靶基因。结论:miR-940在非小细胞肺癌中呈低表达,miR-940可能通过靶向抑制Cbl-b基因,进而抑制A549细胞的增殖、迁移和侵袭能力。     

miR-492对非小细胞肺癌细胞迁移及侵袭能力的影响

目的:探讨miR-492对非小细胞肺癌（non-small cell lung cancer,NSCLC）细胞迁移和侵袭能力的影响,并探讨其可能的作用机制。方法:RT-qPCR检测NSCLC组织及细胞株（Calu-1、A549、H1650和H1299）中miR-492的表达。A549细胞瞬时转染miR-492 mimics或miR-492 inhibitors,并通过划痕实验及Transwell实验检测细胞的迁移及侵袭能力。双荧光素酶实验证实miR-492调控的靶基因。结果:NSCLC组织及细胞株中miR-492表达明显升高。将miR-492 mimics转染A549细胞后,细胞的迁移和侵袭能力明显增强。将miR-492 inhibitors转染A549细胞后,细胞的迁移和侵袭能力明显减弱。PTPN9是miR-492的直接靶基因。结论:miR-492可能通过调节靶基因PTPN9,从而促进NSCLC细胞的迁移和侵袭。     

miR-125a-5p靶向RRM2调控A549/DDP细胞的顺铂耐药性

目的:探究微小RNA-125a-5p（microRNA-125a-5p,miR-125a-5p）对非小细胞肺癌A549/DDP细胞顺铂敏感性的影响及其机制。方法:使用ENCORI在线数据库分析miR-125a-5p在非小细胞肺癌癌组织与癌旁组织中的表达水平;采用实时荧光定量聚合酶链反应（real-time quantitative PCR,RT-qPCR）的方法检测人肺上皮正常细胞（BEAS-2B）与非小细胞肺癌细胞系（A549、A549/DDP、SK-MES-1）中miR-125a-5p的表达水平;使用RT-qPCR与蛋白免疫印迹法（Western blot）检测A549、A549/DDP细胞中核糖核苷酸还原酶M2(ribonucleotide reductase regulatory subunit M2,RRM2)的表达情况;生物信息学方法分析miR-125a-5p与RRM2的靶向调控序列;双荧光素酶基因报告实验与Western blot测定miR-125a-5p与RRM2在A549/DDP细胞中的调控关系;细胞计数试剂盒（CCK-8）检测细胞的存活率与半数抑制浓度（half inhibitory concentration,IC50）;流式细胞术检测细胞凋亡率。结果:在非小细胞肺癌组织与细胞系中miR-125a-5p的表达水平显著降低（P＜0.05）;与A549细胞相比,A549/DDP细胞中RRM2的表达水平显著升高（P＜0.05）;过表达miR-125a-5p部分恢复了顺铂对A549/DDP细胞的抑制作用,使细胞存活率显著降低（P＜0.05）,凋亡率显著增加（P＜0.05）;双荧光素酶报告实验证实miR-125a-5p能够靶向结合RRM2（P＜0.05）;过表达RRM2逆转了miR-125a-5p对A549/DDP的作用,降低了A549/DDP对顺铂的敏感性（P＜0.05）。结论:miR-125a-5p可通过靶向下调RRM2基因的表达,从而部分恢复A549/DDP细胞对顺铂的敏感性。     

miR-194-5p调控LMNB1抑制肺腺癌细胞的生长转移

目的:探究miR-194-5p调控LMNB1对肺腺癌细胞生长转移的作用。方法:实时荧光定量PCR（qRT-PCR）实验检测肺腺癌组织和癌旁组织中miR-194-5p、LMNB1表达水平。体外培养肺腺癌细胞A549,分为对照组、miR-194-5p mimics阴性对照组、miR-194-5p mimics组。转染处理后,CCK-8实验检测各组A549细胞增殖情况,比较各组细胞活力;流式细胞实验检测各组A549细胞凋亡率;细胞划痕及Transwell小室侵袭实验分别检测各组A549细胞迁移、侵袭力,比较各组细胞迁移、侵袭数;免疫印迹实验检测各组A549细胞凋亡蛋白caspase-3、Bax和上皮间质转化（epithelial-mesenchymal transition,EMT）相关蛋白E-cadherin、Vimentin表达;qRT-PCR实验及免疫印迹实验分别检测各组A549细胞miR-194-5p、LMNB1 mRNA表达及LMNB1蛋白表达。结果:相比癌旁组织,肺腺癌组织中miR-194-5p表达水平明显降低（P＜0.05）,LMNB1表达水平明显升高（P＜0.05）。相比对照组,miR-194-5p mimics组A549细胞活力、细胞迁移数、细胞侵袭数、LMNB1 mRNA表达水平、Vimentin和LMNB1蛋白表达水平显著降低（P＜0.05）,细胞凋亡率、miR-194-5p表达、caspase-3、Bax和E-cadherin蛋白表达水平显著升高（P＜0.05）。miR-194-5p mimics阴性对照组A549细胞上述各指标与对照组相比差异无统计学意义（P＞0.05）。结论:miR-194-5p可下调LMNB1表达,抑制肺腺癌细胞增殖,促进其凋亡,并降低其迁移及侵袭能力。     

miR-34a inhibits migration and invasion by down-regulation of c-Met expression in human hepatocellular carcinoma cells

Several studies have shown that miR-34a represses the expression of many genes and induces G1 arrest, apoptosis, and senescence. In the present study, we identified the role of miR-34a in the regulation of tumor cell scattering, migration, and invasion. Down-regulation of miR-34a expression was highly significant in 19 of 25 (76%) human hepatocellular carcinoma (HCC) tissues compared with adjacent normal tissues and associated with the metastasis and invasion of tumors. Furthermore, resected normal/tumor tissues of 25 HCC patients demonstrated an inverse correlation between miR-34a and c-Met-protein. In HepG2 cells, ectopic expression of miR-34a potently inhibited tumor cell migration and invasion in a c-Met-dependent manner. miR-34a directly targeted c-Met and reduced both mRNA and protein levels of c-Met; thus, decreased c-Met-induced phosphorylation of extracellular signal-regulated kinases 1 and 2 (ERK1/2). Taken together, these results provide evidence to show the suppression role of miR-34a in tumor migration and invasion through modulation of the c-Met signaling pathway.