miR-30c Impedes Glioblastoma Cell Proliferation and Migration by Targeting SOX9

miR-30c has been acknowledged as a tumor suppressor in various human cancers, such as ovarian cancer, gastric cancer, and prostate cancer. However, the role of miR-30c in glioblastoma (GBM) needs to be investigated. In our study, we found that the expression of miR-30c was significantly downregulated in GBM tissues and cell lines. We found that overexpression of miR-30c inhibited cellular proliferation of GBM cells in vitro and in vivo. More GBM cells were arrested in the G₀ phase after miR-30c overexpression. Moreover, we showed that miR-30c overexpression suppressed the migration and invasion of GBM cells. Mechanistically, we found that SOX9 was a direct target of miR-30c in GBM cells. Overexpression of miR-30c inhibited the mRNA and protein levels of SOX9 in GBM cells. Moreover, there was a negative correlation between the expression of miR-30c and SOX9 in GBM tissues. Finally, we showed that restoration of SOX9 in GBM cells reversed the proliferation, migration, and invasion of GBM cells transfected with miR-30c mimic. Collectively, our results demonstrated that miR-30c suppressed the proliferation, migration, and invasion of GBM cells via targeting SOX9.     

MicroRNA-195 inhibits non-small cell lung cancer cell proliferation,migration and invasion by targeting MYB

MicroRNA-195 (miR-195) has been implicated in several other cancers; however, its role in non-small cell lung cancer (NSCLC) remains unclear. In this study, we demonstrated that miR-195 was significantly down-regulated in NSCLC samples and cell lines compared with corresponding normal counterparts. In vitro and in vivo functional assays demonstrated that modulation of miR-195 expression affected NSCLC cell proliferation, migration and invasion. Using miRNA target prediction algorithms and reporter assays, we demonstrated that miR-195 suppressed the expression of MYB both at the mRNA and protein level, and was directly bound to the 3′untranslated region of MYB mRNA. Overexpression of MYB in NSCLC cells using an ectopic expression vector restored the decreased cell proliferation, migration and invasion effects induced by miR-195. Finally, we observed an inverse correlation between MYB and miR-195 in NSCLC. Taken together, our findings indicated that miR-195 functions as tumour suppressor in NSCLC, and the miR-195/MYB axis might represent a potential therapeutic target for NSCLC intervention.     

lncRNA MNX1-AS1 Promotes Glioblastoma Progression Through Inhibition of miR-4443

Long noncoding RNAs (lncRNAs) have been acknowledged as important regulators in various human cancers. lncRNA MNX1-AS1 has been shown to be an oncogene in epithelial ovarian cancer. However, the function of MNX1-AS1 in glioblastoma (GBM) remains largely unknown. Here we found that the expression of MNX1-AS1 was significantly upregulated in GBM tissues and cell lines. Knockdown of MNX1-AS1 significantly inhibited the proliferation, migration, and invasion of GBM cells. In terms of mechanism, we found that MNX1-AS1 could bind to miR-4443 in GBM cells. Overexpression of miR-4443 significantly inhibited the expression of MNX1-AS1 and vice versa. Moreover, there was an inverse correlation between the expression levels of MNX1-AS1 and miR-4443 in GBM tissues. We found that overexpression of miR-4443 inhibited the proliferation, migration, and invasion of GBM cells. We also showed that inhibition of miR-4443 reversed the effects of MNX1-AS1 knockdown on GBM cell proliferation, migration, and invasion. Taken together, we found that MNX1-AS1 promoted the proliferation, migration, and invasion of GBM cells through inhibiting miR-4443.     

miRNA-335基因启动子区甲基化与胃癌细胞不良生物学行为的关系

目的:探讨miR-335基因启动子区异常甲基化状态对胃癌细胞系中miR-335表达水平的影响,以及miR-335基因启动子区甲基化状态对胃癌细胞侵袭,迁移,以及增殖能力的影响。方法:1株永生化胃黏膜上皮细胞系(GES-1)和4株胃癌细胞系(SGC-7901,MKN-45,BGC-823和AGS)。实时荧光定量PCR(qRT-PCR)检测胃癌细胞株miR-335及CRKL的表达水平。甲基化特异性PCR(MSP)方法检测胃癌细胞株miR-335的基因启动子区甲基化状态。应用MTT方法检测恢复miR-335表达对胃癌细胞增殖能力的影响,Transwell侵袭迁移实验及划痕愈合实验分析恢复miR-335表达对胃癌细胞系侵袭及迁移能力的影响。结果:MSP实验结果表明,MKN-45、SGC-7901和BGC-823细胞系均存在基因启动子区异常的高甲基化状态,AGS细胞系基因启动子区亦呈部分高甲基化状态。去甲基药物5-aza-2′-deoxycytidine处理后胃癌细胞miR-335的表达水平可升高2~3倍。Transwell侵袭迁移实验及划痕愈合实验表明miR-335表达水平恢复后SGC-7901细胞的侵袭和迁移能力明显降低。MTT实验结果表明5-aza-2′-deoxycytidine处理后的SGC-7901细胞系与对照组相比,增殖能力显著降低。结论:miR-335启动子区的异常高甲基化状态抑制了miR-335在胃癌细胞系中的表达,恢复miR-335的表达水平可以抑制胃癌细胞的增殖,迁移和侵袭能力。miR-335为胃癌的肿瘤抑制因子。     

miR-132 Targets FOXA1 and Exerts Tumor-Suppressing Functions in Thyroid Cancer

MicroRNA-132 (miR-132) has been demonstrated to be a tumor suppressor in several types of tumors. However, the expression and the role of miR-132 in human thyroid cancer are still poorly understood. The aim of the present study was to examine the potential roles and molecular mechanism of miR-132 in thyroid cancer. We found that miR-132 expression levels were significantly downregulated in thyroid cancer tissues and cell lines. Function assays showed that overexpression of miR-132 in TPC1 cells inhibited cell proliferation, migration, and invasion. Forkhead box protein A1 (FOXA1) was identified as a direct target of miR-132 in thyroid cancer cells. Knockdown of FOXA1 in TPC1 cells significantly inhibited cell proliferation, migration, and invasion, which mimicked the suppressive effect induced by miR-132 overexpression. Restoration of FOXA1 expression partially reversed the suppressive effect induced by miR-132 overexpression. Taken together, these results suggested that miR-132 acts as a tumor suppressor in thyroid cancer through targeting FOXA1.     

miR-132 Targets FOXA1 and Exerts Tumor-Suppressing Functions in Thyroid Cancer

MicroRNA-132 (miR-132) has been demonstrated to be a tumor suppressor in several types of tumors. However, the expression and the role of miR-132 in human thyroid cancer are still poorly understood. The aim of the present study was to examine the potential roles and molecular mechanism of miR-132 in thyroid cancer. We found that miR-132 expression levels were significantly downregulated in thyroid cancer tissues and cell lines. Function assays showed that overexpression of miR-132 in TPC1 cells inhibited cell proliferation, migration, and invasion. Forkhead box protein A1 (FOXA1) was identified as a direct target of miR-132 in thyroid cancer cells. Knockdown of FOXA1 in TPC1 cells significantly inhibited cell proliferation, migration, and invasion, which mimicked the suppressive effect induced by miR-132 overexpression. Restoration of FOXA1 expression partially reversed the suppressive effect induced by miR-132 overexpression. Taken together, these results suggested that miR-132 acts as a tumor suppressor in thyroid cancer through targeting FOXA1.     

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.     

Genetic and epigenetic loss of microRNA-31 leads to feed-forward expression of EZH2 in melanoma

MicroRNAs (miRs) play a key role in cancer etiology by coordinately repressing numerous target genes involved in cell proliferation, migration and invasion. The genomic region in chromosome 9p21 that encompasses miR-31 is frequently deleted in solid cancers including melanoma; however the expression and functional role of miR-31 has not been previously studied in melanoma. Here, we queried the expression status and performed functional characterization of miR-31 in melanoma tissues and cell lines. We found that down-regulation of miR-31 was a common event in melanoma tumors and cell lines and was associated with genomic loss in a subset of samples. Down-regulation of miR-31 gene expression was also a result of epigenetic silencing by DNA methylation, and via EZH2-mediated histone methylation. Ectopic overexpression of miR-31 in various melanoma cell lines inhibited cell migration and invasion. miR-31 targets include oncogenic kinases such as SRC, MET, NIK (MAP3K14) and the melanoma specific oncogene RAB27a. Furthermore, miR-31 overexpression resulted in down-regulation of EZH2 and a de-repression of its target gene rap1GAP; increased expression of EZH2 was associated with melanoma progression and overall patient survival. Taken together, our study supports a tumor suppressor role for miR-31 in melanoma and identifies novel therapeutic targets.     

circ_0000619通过调控miR-595/GLS轴对食管鳞状细胞癌细胞增殖及谷氨酰胺代谢的影响

目的:探讨circ_0000619/miR-595/GLS轴对人食管鳞状细胞癌（esophageal squamous cell carcinoma,ESCC）KYSE150细胞增殖、迁移、侵袭和谷氨酰胺代谢的影响及其可能的机制。方法:采用qPCR法检测KYSE150细胞中circ_0000619、miR-595、谷氨酰胺酶（glutaminase,GLS）mRNA等表达水平,Western blot检测KYSE150细胞中GLS蛋白的表达情况,使用细胞计数试剂盒-8（cell counting kit-8,CCK-8）试剂盒、Transwell法分别检测KYSE150细胞增殖、迁移及侵袭能力,使用相应的检测试剂盒检测KYSE150细胞谷氨酰胺消耗、谷氨酸产生及ATP产生水平,利用生物信息学分析技术及双荧光素酶报告基因实验分析并检测circ_0000619、miR-595与GLS mRNA之间的相互作用关系。结果:circ_0000619在ESCC细胞系中呈现高表达,其亲本基因DENND4A mRNA在食管癌组织中呈高表达（P<0.01）;敲减circ_0000619显著抑制KYSE150细胞的增殖、侵袭和迁移能力（P<0.01）,并显著抑制KYSE150细胞的谷氨酰胺消耗、谷氨酸及ATP产生水平（P<0.01）;敲减circ_0000619显著上调miR-595表达（P<0.01）,抑制GLS mRNA（P<0.01）及蛋白的表达;双荧光素酶报告基因实验显示在KYSE150细胞中,circ_0000619与miR-595存在靶向结合、miR-595与GLS存在靶向结合（P<0.01）。circ_0000619敲低显著降低了KYSE150细胞谷氨酰胺代谢和细胞增殖,并且这些作用被miR-595抑制或GLS过表达部分逆转。结论:circ_0000619能通过靶向调控miR-595/GLS轴增强ESCC细胞谷氨酰胺代谢及细胞增殖,并可能成为潜在的ESCC治疗靶点。     

miR-143-3p通过靶向EZH2 调控结肠癌RKO细胞增殖、迁移和侵袭

目的：探讨miR-143-3p 通过靶向果蝇zeste 基因增强子同源物2（enhancer of zeste homolog 2, EZH2）调控结肠癌RKO细胞增殖、迁移和侵袭的分子机制。方法：选用2015 年3 月至2017 年7 月昆明医科大学第一附属医院手术切除的40 例结肠癌患者的癌及癌旁组织标本,以及结肠癌细胞系COLO320、RKO、CL-11 和正常肠黏膜细胞株NCM460,用qPCR 法检测结肠癌组织和细胞系中miR-143-3p 的表达水平。分别将miR-143-3p mimics、miR-143-3p inhibitor、EZH2 shRNA 及阴性对照质粒转染进RKO细胞,用CCK-8 法、Transwell 小室法分别检测miR-143-3p/EZH2 分子轴对RKO细胞增殖、迁移和侵袭的影响,用Western blotting 检测RKO细胞中EZH2蛋白的表达。用双荧光素酶报告基因实验验证miR-143-3p 和EZH2 的靶向关系。结果：miR-143-3p在结肠癌组织和细胞系中均低表达（均P<0.01）。过表达miR-143-3p 显著抑制RKO 细胞的增殖、迁移和侵袭能力（均P<0.01）。双荧光素酶报告基因实验证实miR-143-3p 靶向EZH2。同时敲降miR-143-3p 和EZH2 可逆转敲降EZH2 对RKO细胞增殖、迁移和侵袭能力的抑制作用。结论：miR-143-3p 通过靶向EZH2并下调其表达水平进而抑制结肠癌细胞的增殖、迁移与侵袭。     

miR-124 在乳腺癌中的表达及其作用机制研究

目的：探讨m iR- 124 表达与乳腺癌发生、发展的相关性及机制。方法：运用实时定量聚合酶链反应（qRT-PCR）检测乳腺癌细胞系以及52例患者乳腺癌癌组织和对应的癌旁正常组织样本中miR-124 的表达水平。在乳腺癌细胞株MDA-MB-231和T-47D 中过表达miR-124 后,测定细胞增殖活性以及侵袭转移能力。构建荧光素酶报告载体pMIR- 特异性蛋白1（specificityprotein 1,SP1）的3'UTR,利用荧光素酶活性检测鉴定miR-124 的预测靶基因SP1。qRT-PCR和Westernblot法分别检测SP1 的mRNA 和蛋白质的表达水平。结果：miR-124 在乳腺癌细胞系和癌组织中表达量下调,差异具有统计学意义（P < 0.01）,并与肿瘤的转移、分期、分级和预后相关。在乳腺癌细胞株MDA-MB-231 和T-47D 中过表达miR-124 后抑制乳腺癌细胞系的增殖、侵袭以及迁移（P < 0.01）。 转染miR-124 模拟物显著抑制荧光素酶的活性（P < 0.05）。 转染miR-124 模拟物显著下调MDA-MB-231 和T-47D 细胞中SP1 的mRNA（P < 0.05）和蛋白质的表达水平。结论：miR-124 在乳腺癌癌组织中低表达,miR-124 低表达与乳腺癌不良预后有关,且miR-124 可通过调控转录因子SP1 抑制乳腺癌癌细胞的增殖、侵袭和转移。miR-124 表达异常减少可能是乳腺癌发生、发展的重要因素。     

microRNA-122抑制胰腺癌细胞增殖、迁移和侵袭

目的 明确microRNA-122(miR-122)在胰腺癌中的表达及miR-122对胰腺癌细胞增殖、迁移和侵袭的作用.方法 采用RT-qPCR方法检测20例胰腺癌组织、胰腺癌细胞株(ASPC1、PANC1、MP和SW1990)和人源正常胰腺导管上皮细胞株(HPDE)中miR-122的表达量.将miR-122模拟类似物...     

miRNA-26b-3p通过靶向STAT3调控食管鳞状细胞癌细胞的增殖和迁移

目的:观察miR-26b-3p在食管鳞状细胞癌(ESCC)组织中的表达水平及其对ESCC细胞增殖、侵袭和迁移能力的影响,并探讨其分子调控机制.方法:选取河北医科大学第四医院2018年4月1日至2018年12月25日手术切除的ESCC组织及相应癌旁组织各60例,利用qPCR法检测ESCC组织、癌旁组织和ESCC细胞中mi...     

miR-515-5p通过靶向HDAC2影响食管癌发生发展的分子机制

目的：探讨miR-515-5p对食管癌细胞增殖、迁移和侵袭的影响及其分子机制。方法：选取2020年6月至2020年12月在河北医科大学第四医院手术切除的60例食管癌患者的癌组织标本和20例健康成人的食管上皮组织标本,以及食管癌细胞TE1、Eca109、KYSE30和KYSE170,用q PCR法检测食管癌组织和细胞中miR-515-5p的表达水平。在Eca109细胞中转染miR-515-5p模拟物以及其阴性对照物、在TE1细胞中转染miR-515-5p抑制剂以及其阴性对照物,q PCR法检测转染效率,用CCK-8法、Transwell实验分别检测转染细胞的增殖、迁移及侵袭能力。采用生物信息学方法分析预测miR-515-5p的下游靶基因,双荧光素酶报告基因实验验证组蛋白去乙酰化酶2(histone deacetylase 2,HDAC2)为miR-515-5p的靶基因。应用GEPIA和TCGA数据集分析HDAC2在食管癌组织中的表达及其与患者临床特征的关系。结果：miR-515-5p在食管癌组织及细胞中表达降低（均P<0.01）。过表达miR-515-5p抑制食管癌Eca109细胞...     

miR-186 Suppresses the Progression of Cholangiocarcinoma Cells Through Inhibition of Twist1

Deregulation of miR-186 and Twist1 has been identified to be involved in the progression of multiple cancers. However, the detailed molecular mechanisms underlying miR-186-involved cholangiocarcinoma (CCA) are still unknown. In this study, we found that miR-186 was downregulated in CCA tissues and cell lines, and negatively correlated with the expression of Twist1 protein. In vitro assays demonstrated that miR-186 mimics repressed cell proliferation, in vivo tumor formation, and caused cell cycle arrest. miR-186 mimics also inhibited the migration and invasion of CCLP1 and SG-231 cells. Mechanistically, the 3′-untranslated region (3′-UTR) of Twist1 mRNA is a direct target of miR-186. Further, miR-186 inhibited the expressions of Twist1, N-cadherin, vimentin, and matrix metallopeptidase 9 (MMP9) proteins, whereas it increased the expression of E-cadherin in CCLP1 and SG-231 cells. Silencing of Twist1 expression enhanced the inhibitory effects of miR- 186 on the proliferation, migration, and invasion of CCLP1 and SG-231 cells. In conclusion, miR-186 inhibited cell proliferation, migration, invasion, and epithelial–mesenchymal transition (EMT) through targeting Twist1 in human CCA. Thus, miR-186/Twist1 axis may benefit the development of therapies for CCA.     

MicroRNA-152 Inhibits Cell Proliferation,Migration, and Invasion in Breast Cancer

The aim of the present study was to investigate the roles of microRNA-152 (miR-152) in the initiation and progression of breast cancer. The expression level of miR-152 was detected in human breast cancer tissue and a panel of human breast cancer cell lines using qRT-PCR. Results found that miR-152 expression was significantly downregulated in breast cancer tissue samples compared to adjacent noncancerous tissues as well as in breast cancer cell lines. Overexpression of miR-152 significantly suppressed breast cancer cell proliferation, migration, and invasion. Luciferase reporter assay results found that ROCK1 is a direct and functional target gene of miR-152 in breast cancer. In addition, downexpression of ROCK1 could inhibit breast cancer cell proliferation, migration, and invasion. These findings indicate that miR-152 inhibited breast cancer growth and metastasis through negative regulation of ROCK1 expression. These data suggest that miR-152/ROCK1 pathway may be a useful therapeutic target for breast cancer treatment.     

miR-17-5p 通过下调BRMS1L表达调控鼻咽癌CNE2 细胞增殖、侵袭、迁移和凋亡

目的：探讨miR-17-5p 通过调控乳腺癌转移抑制基因1 相似基因（breast cancer metastasis suppressor 1 like,BRMS1-like 或BRMS1L）表达调控鼻咽癌细胞增殖和侵袭的分子机制。方法：收集2014 年1 月至2017 年12 月间平煤神马医疗集团总医院收治的40 例鼻咽癌患者切除的鼻咽癌组织及其相应的癌旁组织标本,以及鼻咽癌细胞系CNE 2、HONE 1、C666-1 和鼻咽部永生化上皮细胞株NP69,采用qPCR 检测miR-17-5p 在癌组织和癌细胞系中的表达水平。通过StarBase 数据库预测BRMS1L 与miR-17-5p 的靶向关系,采用双荧光素酶报告基因实验进行验证。WB检测转染miR-17-5p 模拟物和抑制物对CNE2 细胞中BRMS1L表达的影响;CCK-8、Transwell 和流式细胞术检测miR-17-5p/BRMS1L分子轴对CNE2 细胞增殖、侵袭、迁移和凋亡的影响。结果：miR-17-5p 在鼻咽癌组织和鼻咽癌细胞系中呈高表达（P<0.05 或P<0.01）,下调miR-17-5p 显著抑制CNE2 细胞增殖、侵袭、迁移但促进细胞凋亡（P<0.05 或P<0.01）。miR-17-5p 靶向作用于BRMS1L并下调其表达水平。过表达BRMS1L可显著抑制CNE2 细胞增殖、侵袭、迁移而促进细胞凋亡（均P<0.01）;而同时过表达miR-17-5p 和BRMS1L 可逆转上述作用（均P<0.01）。结论：miR-17-5p通过靶向下调BRMS1L的表达,进而促进CNE2 细胞增殖、侵袭和迁移而抑制细胞凋亡。     

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.