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.     

miR-124 Inhibits Growth and Invasion of Gastric Cancer by Targeting ROCK1

MicroRNAs (miRNAs) act as critical regulators of genes involved in many biological processes. Aberrant alteration of miRNAs have been found in many cancers, including gastric cancer (GC), but the molecular mechanisms are not well understood. Herein, we investigated the role of miR-124 in GC. We found that its expression was significantly reduced in both GC tissue samples and cell lines. Forced expression of miR-124 suppressed GC cell proliferation, migration, and invasion. Furthermore, the Rho-associated protein kinase (ROCK1) was identified as a direct target of miR-124 in GC cells. Finally, silencing of ROCK1 showed similar effects as miR-124 overexpression, while supplementation of ROCK1 remarkably restored the cell growth and invasion inhibited by miR-124. Together, our data demonstrate that miR-124 acts as a tumor suppressor bytargeting ROCK1, and posit miR-124 as a novel strategy for GC treatment.     

miR-9500靶向SMAD2调控肺腺癌细胞的迁移和侵袭

目的 探讨miR-9500通过靶向SMAD2调控肺腺癌细胞迁移侵袭的相关分子机制。方法 通过生物信息学分析筛选出miR-9500的核心靶基因,并对其进行GO功能和KEGG信号通路富集及生存分析。预测miR-9500与其关键靶基因SMAD2之间的靶向结合位点,双荧光素酶报告实验验证miR-9500与SMAD2之间是否存在直接靶向关系,qRT-PCR和Western blot检测miR-9500对SMAD2 mRNA和蛋白表达水平的影响。划痕、Transwell实验及基质胶侵袭实验分析miR-9500对肺腺癌细胞迁移侵袭能力的影响。结果miR-9500核心靶基因主要富集于癌症通路、TGF-β信号通路和黏着斑信号通路等。排名前10的核心靶基因中,只有VAMP2、SMAD2及RXRA的表达水平与肺腺癌患者的总生存期显著相关。miR-9500可靶向结合SMAD2来下调SMAD2的表达水平。且过表达miR-9500可显著抑制肺腺癌细胞的迁移和侵袭能力,并显著降低迁移侵袭标志蛋白MMP2、MMP9的表达水平。结论 miR-9500可通过靶向SMAD2抑制肺腺癌细胞的迁移侵袭,其可能作为抑癌因子在肺腺...     

PP2药物抑制乳腺癌细胞侵袭与增殖的机制

目的以PP2E4-Amino-5-（4-Chloro-Phenyl）-7-（t-Butyl）PyrazoloE3,4-d]Pyrimidine]药物（src激酶抑制剂）处理乳腺癌细胞,检测src激酶及E-cadherin蛋白表达水平的变化,观察PP2对乳腺癌细胞增殖和侵袭能力的影响,并探讨其可能的机制。方法PP2处理乳腺癌细胞MDA-MB231,Westernblot检测src及其相关蛋白的表达;Boyden小室实验检测细胞侵袭能力;MTT检测细胞的增殖能力。结果PP2处理MDA-MD231细胞后,src表达水平明显降低,Ecadherin表达水平升高;细胞的增殖和侵袭能力均受到明显抑制,剂量越高抑制作用越明显（P〈0．05）。结论PP2通过提高细胞粘附分子E-cadherin的表达,从而抑制乳腺癌细胞MDAMB-231的增殖和侵袭能力。     

miR-203 Inhibits the Invasion and EMT of Gastric Cancer Cells by Directly Targeting Annexin A4

Many studies have shown that downregulated miR-203 level is in a variety of cancers including gastric cancer (GC). However, the precise molecule mechanisms of miR-203 in GC have not been well clarified. In the current study, we investigated the biological functions and molecular mechanisms of miR-203 in GC cell lines. We found that miR-203 is downregulated in GC tissues and cell lines. Moreover, the low level of miR-203 was associated with increased expression of annexin A4 in GC tissues and cell lines. The invasion and EMT of GC cells were suppressed by overexpression of miR-203. However, downregulation of miR-203 promoted invasion and EMT of GC cells. Bioinformatics analysis predicted that annexin A4 was a potential target gene of miR-203. Next, luciferase reporter assay confirmed that miR-203 could directly target annexin A4. Consistent with the effect of miR-203, downregulation of annexin A4 by siRNA inhibited the invasion and EMT of GC cells. Introduction of annexin A4 in GC cells partially blocked the effects of miR-203 mimic. Introduction of miR-203 directly targeted annexin A4 to inhibit the invasion and EMT of GC cells. Overall, reactivation of the miR-203/annexin A4 axis may represent a new strategy for overcoming metastasis of GC.     

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。     

miR-145通过靶向AP4对非小细胞肺癌A549细胞迁移侵袭的影响

 目的 探讨miR-145对非小细胞肺癌迁移与侵袭能力的影响及其可能的作用机制。方法 qRTPCR法检测非小细胞肺癌组织中miR-145和激活增强子结合蛋白4（activating enhancer binding protein4, AP4）mRNA的表达。A549细胞转染miR-145 mimic或者AP4 siRNA后，划痕实验与Transwell小室法分别检测A549细胞的迁移与侵袭能力，qRT-PCR法与免疫印迹法（Western blot）检测A549细胞中AP4 mRNA与蛋白表达水平；双荧光素酶报告基因法检测AP4 mRNA与miR-145的关系。结果 与癌旁正常组织相比，非小细胞肺癌组织中miR-145表达明显降低（P<0.05），而AP4 mRNA和蛋白表达均明显升高（均P<0.05）；与对照组相比，转染miR-145 mimic后，A549细胞中miR-145表达明显升高（P<0.05），AP4 mRNA和蛋白水平明显降低（P<0.05）；A549细胞的迁移数与侵袭能力均显著下降（均P<0.05）；双荧光素酶报告基因法验证AP4 mRNA是miR-145的靶基因。A549细胞转染AP4siRNA后，A549细胞的迁移数与侵袭数显著下降（均P<0.05）。结论 上调miR-145能抑制A549细胞的迁移与侵袭能力，可能与其抑制靶基因AP4表达有关。     

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...     

人乳腺癌组织中miR-34a的表达及其在乳腺癌细胞系中的功能研究

目的 探讨miR-34a在人乳腺癌组织和细胞中的表达情况及对乳腺癌细胞系MDA-MB-231增殖、迁移侵袭和凋亡等生物学行为的影响,为研究乳腺癌组织中miR-34a的作用及深入了解乳腺癌发生发展的分子机制奠定理论基础。方法 通过实时荧光定量PCR（qRT-PCR）法检测miR-34a在20例人乳腺癌组织和癌旁正常组织中表达量的差异并比较其在人乳腺癌细胞系MDA-MB-231、MCF-7和正常乳腺上皮细胞MCF-10A中的表达差异;体外利用脂质体转染技术,转染miR-34a的模拟物（miR-34a mimic）和标记FAM（绿色荧光）的阴性对照(negative control ,miR-NC)进入MDA-MB-231细胞,研究miR-34a对细胞增殖活性、迁移和侵袭能力以及凋亡和周期分布的影响。结果 miR-34a在乳腺癌组织中的表达量较正常癌旁组织下调(P＜0.01);在MDA-MB-231、MCF-7和MCF-10A中的表达呈依次增高的趋势(P＜0.01);转染miR-34a mimic与转染miR-NC的MDA-MB-231相比,其增殖活力、迁移和侵袭能力均下降(P＜0.01),凋亡增加(P＜0.01),细胞周期被阻滞在G1/G0期（P＜0.01）。结论 miR-34a在乳腺癌组织和细胞系MDA-MB-231及MCF-7中的表达较正常组织和MCF-10A中都明显下调;miR-34a能够抑制肿瘤细胞MDA-MB-231的增殖、侵袭迁移,增加细胞凋亡率,使细胞周期阻滞在G0/G1;miR-34a可能起到抑癌作用,其表达水平与乳腺癌的发生发展密切相关。     

miR-185 Inhibits the Proliferation and Invasion of Non-Small Cell Lung Cancer by Targeting KLF7

MicroRNAs (miRNAs) are short endogenous noncoding RNAs that frequently play vital roles in many cancer types. Herein we demonstrated that miR-185 was remarkably downregulated in NSCLC tissues compared with adjacent normal tissues. A lower level of miR-185 was associated with lymph node metastasis. Functional assays showed that upregulation of miR-185 inhibited the proliferation, colony formation, and invasion capacities of NSCLC cells in vitro. Furthermore, we found that miR-185 suppressed the epithelial–mesenchymal transition (EMT) process. Bioinformatics analysis and luciferase reporter gene assays revealed that Kruppellike factor 7 (KLF7) was the target of miR-185. Overexpression of miR-185 reduced the expression of KLF7 in NSCLC cells. Upregulation of KLF7 partly neutralized the inhibitory effects of miR-185 on the proliferation and invasion of NSCLC. Additionally, we confirmed that miR-185 suppressed the tumor growth of NSCLC A549 cells in vivo. Taken together, these results demonstrate that miR-185 acts as a suppressor by targeting KLF7 in NSCLC.     

miRNA-26a下调COX-2的表达对乳腺癌细胞增殖和侵袭的影响

目的 探讨miR-26a在乳腺癌组织和细胞中表达量的改变及其对人乳腺癌细胞增殖和侵袭的影响。方法 采用实时荧光定量PCR（Real-time PCR）法检测20例患者乳腺癌组织及对应的癌旁组织、人乳腺癌细胞MCF-7、BT474及健康者乳腺细胞MCF-10A中miR-26a的表达,用Western bolt法检测COX-2的表达。MCF-7及BT474细胞分别转染miR-NC和miR-26a,采用Western blot法检测转染后细胞中COX-2的表达水平,同时采用CCK-8和克隆形成实验检测转染后细胞的增殖和侵袭情况。结果 miR-26a在乳腺癌组织中的表达明显低于癌旁组织（t=20.33, P=0.001）,在MCF-7和BT474细胞中的表达明显低于MCF-10A细胞（Dunnett t test I-J=-0.031, P=0.001）。COX-2在乳腺癌组织和细胞中的表达明显高于癌旁组织（t=18.01, P=0.002）和健康者乳腺细胞（Dunnett t test I-J=-0.028, P=0.000）。转染miR-26a后,乳腺癌细胞内COX-2的表达量显著下调。CCK-8和克隆形成实验结果显示,过表达miR-26a能明显抑制乳腺癌细胞的增殖（F=6.032, P=0.013）和侵袭（Dunnett t test I-J=-0.21, P=0.037）。结论 过表达miR-26a可以通过下调乳腺癌细胞中COX-2的表达,抑制乳腺癌细胞的增殖和侵袭。     

Upregulation of miR-324-5p Inhibits Proliferation and Invasion of Colorectal Cancer Cells by Targeting ELAVL1

Colorectal cancer (CRC) is a common clinical cancer that remains incurable in most cases. miRNAs are reported to play a part in the development of various tumors. In the present study, we found that miR-324-5p was downregulated in CRC cells, while ELAV (embryonic lethal, abnormal vision, Drosophila)-like protein 1 (ELAVL1) showed a higher expression. miR-324-5p transfection significantly inhibited the proliferation as well as invasion in both SW620 and SW480 cells. miR-324-5p mimic transfection markedly decreased the expression of ELAVL1. Luciferase reporter gene assay confirmed that ELAVL1 is a direct target of miR- 324-5p. Furthermore, cancer invasion factors uPA, uPAR, and MMP-9 were found to drop significantly in miR-324-5p-transfected groups. To conclude, our findings indicate that miR-324-5p may play a suppressive role in colorectal cell viability and invasion, at least in part, through directly targeting ELAVL1. Therefore, miR-234-5p might function as a promising candidate for CRC treatment and deserves deeper research.     

miR-126下调MMP-2抑制人脑胶质瘤细胞侵袭

目的初步探讨miR-126抑制人胶质瘤细胞侵袭的可能机制。方法化学合成miR-126,脂质体转染人脑胶质瘤U87细胞,应用RT-PCR、Western blot检测MMP-2基因和蛋白的表达情况,并应用Transwell小室检测转染前后细胞侵袭力的变化。结果miR-126上调后U87细胞的MMP-2基因和蛋白表达降低,并且细胞侵袭力明显降低。结论化学合成的miR-126在抑制人胶质瘤细胞侵袭过程中发挥重要作用,可能成为胶质瘤基因治疗的新靶点。     

miR-497-5p靶向调控CCNE1基因抑制胰腺癌细胞增殖

目的明确miR-497-5p在胰腺癌(PaCa)中的表达及临床意义,并探究其对PaCa细胞增殖的影响及机制。方法实时荧光定量PCR实验检测miR-497-5p的表达,卡方检验和Kaplan-Meier生存法分析miR-497-5p的表达与临床病理特征及预后的关系;CCK-8实验和流式细胞术检测过表达miR-497-5p对Capan-2和PANC-1细胞增殖和周期的影响,Spearman相关性检验分析miR-497-5p表达与G₁/S特异性细胞周期蛋白E1(cyclin E1,CCNE1)mRNA表达的关系;双荧光素酶报告基因实验和蛋白质印迹法验证miR-497-5p对CCNE1表达的调控作用。结果 miR-497-5p在癌组织中的表达显著低于癌旁正常组织(P<0.001),T3+T4期患者癌组织中miR-497-5p的表达显著低于T1+T2期癌组织(P<0.001);低表达miR-497-5p与较高的T分期相关(P=0.003);低表达miR-497-5p的患者5年总体生存率显著低于高表达者(P=0.036)。与对照组相比,miR-497-5p过表达组...     

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.     

肺癌细胞中miR-96对其侵袭和迁移的影响

Abstract：Objective To investigate the expression of miR-96 in lung cancer tissues and demonstrate theregulative effects of miR-96 ASO on the invasion and migration of lung cancer cells in vitro. Methods Theexpression of miR-96 in 116 cases of lung cancer tissues and their adjacent tissues were detected by fl uorogenicquantitative PCR method. The effects of miR-96 ASO on the invasion and migration ability of lung cancercells were measured by transwell assay and wound healing assay. Invasion-related protein expression wasanalyzed by Western blot. Results In 116 cases of lung cancer, the expression of miR-96 in 63.80%(74/116)of lung cancer tissues was significantly higher than that in adjacent tissues(P<0.05). miR-96 expression inlung cancer cells in miR-96 ASO transfection group was significantly lower than that in MOCK and NCgroup(P<0.05). Transwell and wound healing assay results showed that the invasion and migration ability wasdecreased greatly after transfected with miR-96 ASO, furthermore, down -regulation of miR-96 resulted inobvious inactivation of MMP2 and MMP9(P<0.05). Conclusion miR-96 was up-regulated in human lungcancerous tissue. Reducing the expression of miR-96 can effectively inhibit the invasion and migration of lungcancer cells. miR-96 may become a new target for regulating the invasion and migration ability in lung cancer.     

miR-107 Promotes Proliferation and Inhibits Apoptosis of Colon Cancer Cells by Targeting Prostate Apoptosis Response-4 (Par4)

Colorectal cancer (CRC) is one of the most common malignancies in the world, with a high incidence and a high mortality. However, the pathogenesis of CRC carcinogenesis is still unexplored. In this study, we investigated the role of miR-107 in the regulation of CRC cell proliferation and apoptosis. First, the expression of miR-107 was observed to be aberrantly increased in human CRC tumor tissues and cell lines when compared to the colonic control tissues and colon epithelial cells. Further study showed that the proliferative and apoptotic capacities of human CRC SW480 and LoVo cells were aberrantly regulated by miR-107. The proliferation of SW480 and LoVo cells was remarkably enhanced by the miR-107 mimic but suppressed by the miR-107 inhibitor when compared to the negative control. On the contrary, the apoptotic rate of both SW480 and LoVo cells was significantly inhibited by miR-107 overexpression but increased by miR-107 inhibition. In addition, we identified prostate apoptosis response-4 (Par4) as a direct target of miR-107 with a potential binding site on the 3 -UTR of mRNA, as evaluated by bioinformatics prediction and luciferase reporter assay. Par4 expression levels were significantly inhibited by the miR-107 mimic but upregulated by the miR-107 inhibitor in both SW480 and LoVo cells. Compared to the control, the increase in Par4 expression significantly inhibited the induction role of miR-107 in the proliferation of SW480 and LoVo cells, and the apoptotic rate of cells repressed by the miR-107 mimic was also reversed by Par4 overexpression. In summary, our results demonstrated that miR-107 exerts a positive role in the survival of CRC cells by directly targeting Par4. This might reveal a novel understanding about human CRC pathogenesis.     

miR-455 Functions as a Tumor Suppressor Through Targeting GATA6 in Colorectal Cancer

Emerging evidence indicates that microRNAs (miRNAs) are often aberrantly expressed in human cancers. Meanwhile, the importance of miRNAs in regulating multiple cellular biological processes has been appreciated. The aim of this study was to investigate the significance of miR-455 and identify its possible mechanism in regulating colorectal cancer (CRC) progression. We found that the expression of miR-455 was sharply reduced in CRC tissues and cell lines. Importantly, the low expression of miR-455 was associated with poor overall survival of CRC patients. Overexpression of miR-455 in CRC cell lines significantly inhibited cell proliferation and migration in vitro. Moreover, GATA-binding protein 6 (GATA6), whose expression can be inversely regulated by miR-455 in CRC cell lines, was validated as a direct target of miR-455. Overall, our results revealed that miR-455 functions as a tumor suppressor, and its downregulation may contribute to CRC progression. Our study may provide a novel therapeutic target for CRC in the future.