miR-106b-5p靶向调控细胞周期蛋白D1抑制结直肠癌细胞增殖、迁移与侵袭

目的:探讨miR-106b-5p对结直肠癌(colorectal cancer,CRC)细胞增殖、迁移与侵袭的影响以及其作用机制.方法:实时荧光定量PCR检测miR-106b-5p在CRC组织与相应的癌旁组织、永生化的肠上皮细胞以及肠癌细胞中的表达量;CCK8实验检测DLD1细胞增殖能力;细胞划痕实验检测DLD1细胞的...     

lncRNA HOTAIR通过miR-519d-3p/CCND1 分子轴促进乳腺癌SKBR3细胞的恶性生物学行为

目的：探究lncRNA HOTAIR/miR-519d-3p/CCND1 分子轴对乳腺癌细胞增殖和转移的影响及其可能机制。方法：收集2017 年3 月至2019 年2 月南昌市第三医院乳腺外科手术切除的乳腺癌患者的乳腺癌组织及配对癌旁组织各50 例,qPCR检测癌及癌旁组织中HOTAIR 的表达水平,乳腺正常上皮细胞及乳腺癌细胞系中HOTAIR 和miR-519d-3p 的表达水平。将乳腺癌SKBR3 细胞分为NC 组、si-HOTAIR 组、miR-519d-3p mimics 组,miR-519d-3p mimics+pcHOTAIR 组、miR-519d-3p mimics+pcCCND1 组和si-HOTAIR+pcCCND1 组,CCK-8 法检测各组SKBR3 细胞增殖能力、Transwell 检测细胞侵袭和迁移能力、Western blotting 检测SKBR3 细胞中E-cadherin、N-cadherin、Vimentin 以及CCND1 表达水平。双荧光素酶报告基因检测HOTAIR 和miR-519d-3p 以及miR-519d-3p 和CCND1 的靶向关系。结果：HOTAIR在癌组织以及乳腺癌细胞系中呈高表达,且在SKBR3 细胞系中表达最高。敲降HOTAIR可显著抑制SKBR3 细胞增殖、侵袭和迁移,并显著增加E-cadherin 的表达水平、降低N-cadherin 和Vimentin的表达水平（均P<0.05）。双荧光素酶报告基因检测显示,HOTAIR 靶向下调miR-519d-3p 的表达,miR-519d-3p 靶向下调CCND1 的表达。敲降HOTAIR可增强miR-519d-3p 对CCND1 的下调作用,抑制SKBR3 细胞EMT、增殖、侵袭和迁移能力（均P<0.05）。结论：敲降HOTAIR可抑制SKBR3 细胞增殖和转移,其机制是通过调控miR-519d-3p/CCND1 分子轴实现的。     

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.     

Down-regulation of c-Met and Bcl2 by microRNA-206, activates apoptosis,and inhibits tumor cell proliferation,migration and colony formation

Hsa-miRNA-206 (miR-206), highly expressed in skeletal muscle, has recently been discovered to have anticancer properties in different tissues. However, the role of miR-206 on lung cancer is still ambiguous. In this study, we investigated the role of miR-206 on the development of lung cancer. The results indicated that miR-206 expression was suppressed in lung cancer tissues and very low levels were found in non-small cell lung cancer (NSCLS) cell liness. Transient transfection of miR-206 into cultured A549 and SK-MES-1 cells led to significant decrease in cell growth, migration, invasion and colony formation, and promoted cell apoptosis. Using bioinformatics, we identified putative miR-206 binding sites within the 3′-untranslated region (3′-UTR) of the human c-Met and Bcl2 mRNA. The expression of c-Met and Bcl2 proteins were shown to be down-regulated after treated with miR-206 by subsequent Western blot and qRT-PCR analysis. Conversely, up-regulation of c-Met and Bcl2 were confirmed in tissue samples of human lung cancer, with its level inversely correlated with miR-206 expression. In addition, miR-206 also decreased the gene expression of MMP-9, CCND1 and CCND2 while increased the gene expression of p57 (Kip2) in A549 and SK-MES-1 cells. Taken together, our results demonstrated that miR-206 suppressed c-Met and Bcl2 expression in NSCLS and could function as a potent tumor suppressor in c-Met/Bcl2-over expressing tumors. Inhibition of miR-206 function could contribute to aberrant cell proliferation, migration, invasion and apoptosis, leading to NSCLS development.     

锌指蛋白883在胃癌组织中的表达及生物学功能

目的:探讨锌指蛋白883（ZNF883）在胃癌组织中的表达及预后意义,并观察其对胃癌细胞增殖、迁移和侵袭的影响。方法:基于TCGA数据,通过GEPIA网络平台分析ZNF883 mRNA在胃癌组织和正常胃组织中的表达差异及其与患者生存率的相关性。通过蛋白免疫印记（Western blotting,WB）检测ZNF883蛋白在胃癌组织及对应癌旁组织中的表达水平。ZNF883 shRNA转染人胃癌细胞AGS和NCI-N87,WB检测敲低效率,CCK-8和Transwell小室检测细胞增殖、迁移和侵袭,并通过WB检测细胞周期蛋白D1（CCND1）、细胞周期依赖性激酶4（CDK4）和基质金属蛋白酶2/9（MMP2/9）蛋白表达。结果:TCGA数据分析发现ZNF883 mRNA在胃癌组织中的表达显著高于正常胃组织,其蛋白表达在胃癌组织中亦显著上调。生存分析证实ZNF883 mRNA高表达胃癌患者的无病生存率和总生存率均明显降低。敲低ZNF883显著抑制AGS和NCI-N87细胞增殖、迁移和侵袭。另外,敲低ZNF883显著减少胃癌细胞中CCND1、CDK4和MMP2/9蛋白水平。结论:ZNF883是一个新的胃癌驱动基因,胃癌组织中其高表达提示患者预后不良,ZNF883可能通过促进CCND1、CDK4和MMP2/9表达增强胃癌细胞增殖、迁移和侵袭。     

miR-613通过下调Wnt/β-catenin信号通路活性抑制前列腺癌细胞的增殖与侵袭

目的:研究miR-613在人前列腺癌组织中的表达情况,探讨miR-613是否通过下调Wnt信号通路活性抑制前列腺癌细胞系细胞的增殖和侵袭能力。方法:收集临床前列腺癌组织及配对癌旁组织20例,通过实时荧光定量PCR(RT-qPCR)检测各组组织中miR-613的表达情况。进一步在细胞实验中,通过转染miR-613 mimic和miR-NC至离体培养的PC-3、DU-145细胞中,随后,采用MTT法、平板克隆实验检测细胞增殖和Matrigel侵袭实验测定前列腺癌细胞的侵袭情况,采用荧光素酶分析方法评估Wnt信号通路活性变化,采用实时荧光定量PCR(RT-qPCR)检测Wnt/β-catenin信号通路下游靶基因的转录(包括Cyclin D1和c-Myc),WB法检测细胞中β-catenin、c-Myc和Cyclin D1的表达量。结果:相比配对癌旁组织,miR-613在前列腺癌组织中的表达降低(P<0.01);在体外细胞实验中,相比于miR-NC组,转染miR-613 mimic后,PC-3、DU-145细胞增殖能力下降(P<0.05),PC-3、DU-145细胞的迁移侵袭能力下降(P<0.01);miR-613的过表达显著降低Wnt信号通路活性、β-catenin蛋白表达及Wnt信号下游靶基因Cyclin D1和c-Myc的转录及蛋白表达。结论:miR-613通过抑制Wnt/β-catenin信号通路来影响前列腺癌细胞的增殖与侵袭,为前列腺癌的潜在治疗靶点之一。     

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 miR323a-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28 d时测量并计算移植瘤体积。结果：与癌旁组织相比,NSCLC组织中miR-323a-3p表达水平明显下调,TM4SF1 mRNA和蛋白表达水平显著上调（均P<0.01）。miR-323a-3p过表达或抑制TM4SF1表达都会降低A549细胞的增殖、迁移、侵袭能力及cyclin D1、MMP-2、MMP-9蛋白表达而促进p21蛋白表达,并且抑制A549细胞裸鼠移植瘤的生长（均P<0.01）。生物信息学StarBase工具预测和双荧光素酶基因报告实验结果显示miR-323a-3p能够靶向结合TM4SF1基因并调控 TM4SF1的表达。上调TM4SF1表达后,miR-323a-3p过表达对A549细胞恶性生物学行为及cyclin D1、MMP-2、MMP-9蛋白表达、移植瘤生长的抑制作用均被部分逆转（均P<0.01）,对p21蛋白表达的促进作用也被逆转（P<0.01）。结论：miR-323a-3p 通过靶向下调肺癌A549细胞中TM4SF1的表达抑制细胞的增殖、迁移、侵袭和裸鼠移植瘤生长。     

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.     

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.     

MicroRNA-623 Targets Cyclin D1 to Inhibit Cell Proliferation and Enhance the Chemosensitivity of Cells to 5-Fluorouracil in Gastric Cancer

The dysregulation of microRNAs (miRNAs) plays an important function in the onset and progression of gastric cancer (GC). In addition, aberrantly expressed miRNAs affect the chemosensitivity of GC cells to chemotherapeutic drugs. Hence, miRNA-based targeted therapy might be applied to treat patients with GC exhibiting chemotherapeutic resistance. In this study, miRNA-623 (miR-623) expression was downregulated in GC tissues and cell lines. Functional analysis showed that the restored miR-623 expression could inhibit the proliferation of GC cells and enhance their chemosensitivity to 5-FU via the cell apoptosis pathway. Cyclin D1 (CCND1) was identified as a direct target gene of miR-623 in GC. The overexpressed CCND1 in GC tissues was negatively correlated with miR-623 level. The recovered CCND1 expression counteracted the effects of miR-623 on GC cell proliferation, chemosensitivity, and 5-FU-induced apoptosis. Thus, our results suggest that miR-623 might function as a tumor suppressor in GC and could be a promising therapeutic target for patients with GC, especially those with chemotherapeutic resistance.     

MicroRNAs 221/222 and genistein-mediated regulation of ARHI tumor suppressor gene in prostate cancer

ARHI is an imprinted tumor suppressor gene and is downregulated in various malignancies. However, ARHI expression, function, and mechanisms of action in prostate cancer have not been reported. Here, we report that ARHI mRNA and protein levels were downregulated in prostate cancer tissues compared with adjacent normal tissues. Overexpression of ARHI inhibited cell proliferation, colony formation, invasion, and induced apoptosis. Further studies on a new mechanism of ARHI downregulation showed a significant inverse relationship between ARHI and miR-221 and 222, which were upregulated in prostate cancer cell lines. Transfection of miR-221 and 222 inhibitors into PC-3 cells caused a significant induction of ARHI expression. A direct interaction of miR-221 or 222 with a target site on the 3'UTR of ARHI was confirmed by a dual luciferase pMIR-REPORT assay. Finally, we also found that genistein upregulates ARHI by downregulating miR-221 and 222 in PC-3 cells. In conclusion, ARHI is a tumor suppressor gene downregulated in prostate cancer, and overexpression of ARHI can inhibit cell proliferation, colony formation, and invasion. This study demonstrates for the first time that prostate cancer cells have decreased level of ARHI which could be caused by direct targeting of 3'UTR of ARHI by miR221/222. Genistein, a potential nontoxic chemopreventive agent, restores expression of ARHI and may be an important dietary therapeutic agent for treating prostate cancer.     

miR-449a Suppresses Tumor Growth,Migration, and Invasion in Non-Small Cell Lung Cancer by Targeting a HMGB1-Mediated NF-kB Signaling Pathway

MicroRNAs (miRNAs) have been reported to be involved in many human cancers and tumor progression. The dysregulation of miR-449a is found in many types of malignancies and is associated with tumor growth, migration, and invasion. However, its expression and function in non-small cell lung cancer (NSCLC) still remains unclear. In our study, miR-449a was found to be downregulated in both NSCLC tissues and cell lines, and low miR-449a expression was obviously associated with tumor differentiation, TMN stage, and poor overall survival (OS). Moreover, we demonstrated that miR-449a could inhibit tumor proliferation, migration, and invasion in NSCLC. We also confirmed that HMGB1 was a direct target gene of miR-449a in NSCLC with dual-luciferase reporter assay, and upregulation of HMGB1 could reverse the miR-449a-induced suppression of growth, migration, and invasion in NSCLC cells. Last, we found that miR-449a suppressed tumor initiation and development through the NF- B signaling pathway. These results indicate that miR-449a functions as a tumor suppressor in NSCLC by targeting the HMGB1-mediated NF- B signaling pathway in NSCLC.     

Tumor suppressive microRNA-218 inhibits cancer cell migration and invasion through targeting laminin-332 in head and neck squamous cell carcinoma

Recent our microRNA (miRNA) expression signature revealed that expression of microRNA-218 (miR-218) was reduced in cancer tissues, suggesting a candidate of tumor suppressor in head and neck squamous cell carcinoma (HNSCC). The aim of this study was to investigate the functional significance of miR-218 and its mediated moleculer pathways in HNSCC. Restoration of miR-218 in cancer cells led to significant inhibition of cell migration and invasion activities in HNSCC cell lines (FaDu and SAS). Genome-wide gene expression analysis of miR-218 transfectants and in silico database analysis showed that focal adhesion pathway was a promising candidate of miR-218 target pathways. The laminins are an important and biologically active part of the basal lamina, the function of that are various such as influencing cell differentiation, migration and adhesion as well as proliferation and cell survival. Interestingly, all components of laminin-332 (LAMA3, LAMB3 and LAMC2) are listed on the candidate genes in focal adhesion pathway. Furthermore, we focused on LAMB3 which has a miR-218 target site and gene expression studies and luciferase reporter assays showed that LAMB3 was directly regulated by miR-218. Silencing study of LAMB3 demonstrated significant inhibition of cell migration and invasion. In clinical specimens with HNSCC, the expression levels of laminin-332 were significantly upregulated in cancer tissues compared to adjacent non-cancerous tissues. Our analysis data showed that tumor suppressive miR-218 contributes to cancer cell migration and invasion through regulating focal adhesion pathway, especially laminin-332. Tumor suppressive miRNA-mediated novel cancer pathways provide new insights into the potential mechanisms of HNSCC oncogenesis.     

长链非编码RNA SNHG1靶向miR-340-5p/CCND1轴调控食管癌细胞增殖、迁移和侵袭

目的:分析长链非编码RNA小核仁RNA宿主基因1（LncRNA SNHG1）靶向miR-340-5p/细胞周期蛋白1（CCND1）轴调控食管癌细胞增殖、迁移和侵袭。方法:体外培养人食管上皮细胞、食管癌细胞KYSE-30、TE-1、NEC、Eca109,qRT-PCR法测定细胞中LncRNA SNHG1、miR-340-5p、CCND1 mRNA水平。将对数期NEC细胞分为对照组、sh NC1组、sh LncRNA SNHG1组、sh NC2组、sh CCND1组、sh LncRNA SNHG1+miR-340-5p inhibitor组、sh CCND1+miR-340-5p inhibitor组。CCK-8法测定细胞增殖能力,Transwell小室法测定细胞侵袭、迁移能力,Western blot法检测CCND1、Ki-67、MMP-2蛋白表达,双荧光素酶验证miR-340-5p与LncRNA SNHG1、CCND1的靶向关系,通过裸鼠瘤内注射转染试剂进行体内试验。结果:与人食管上皮细胞相比,食管癌细胞KYSE-30、TE-1、NEC、Eca109中LncRNA SNHG1、CCND1 mRNA表达升高,miR-340-5p表达降低（P＜0.05）,其中NEC细胞变化最显著,所以使用NEC作为下续研究菌株。与对照组、sh NC组相比,sh LncRNA SNHG1组NEC细胞LncRNA SNHG1、OD450、侵袭细胞数、迁移细胞数、Ki-67、MMP-2降低（P＜0.05）;与对照组、sh NC组相比,sh CCND1组CCND1 mRNA与蛋白表达、OD450、侵袭细胞数、迁移细胞数、Ki-67、MMP-2表达降低（P＜0.05）。miR-340-5p与LncRNA SNHG1、CCND1均靶向结合,与sh LncRNA SNHG1组相比,sh LncRNA SNHG1+miR-340-5p inhibitor组OD450、侵袭细胞数、迁移细胞数、Ki-67、MMP-2蛋白表达升高（P＜0.05）;与sh CCND1组相比,sh CCND1+miR-340-5p inhibitor组OD450、侵袭细胞数、迁移细胞数、Ki-67、MMP-2蛋白表达升高（P＜0.05）;裸鼠移植瘤实验进行了体内验证。结论:LncRNA SNHG1沉默可能通过调控miR-340-5p/CCND1表达抑制食管癌NEC细胞增殖、侵袭与迁移,裸鼠体内也验证了这一结果。     

MiR-29c inhibits glioma cell proliferation, migration, invasion and angiogenesis

Previous studies reported that miR-29c is significantly downregulated in several tumors. However, little is known about the effect and molecular mechanisms of action of miR-29c in human glioma. Using quantitative RT-PCR, we demonstrated that miR-29c was significantly downregulated in glioma cell lines and human primary glioma tissues, compared to normal human astrocytes and matched non-tumor associated tissues (P < 0.05, χ² test). Overexpression of miR-29c dramatically reduced the proliferation and caused cessation of cell cycle. The reduced cell proliferation is due to G1 phase arrest as cyclin D1 and cyclin E are diminished whereas p27 and p21 are upregulated. We further demonstrated that miR-29c overexpression suppressed the glioma cell migration and invasion abilities by targeting MMP-2. In addition, we also found that overexpression of miR-29c sharply inhibited angiogenesis, which correlated with down-regulation of VEGF. The data indicate that miR-29c may be a tumor suppressor involved in the progression of glioma.     

miR-150 Suppresses Tumor Growth in Melanoma Through Downregulation of MYB

miR-150 has been demonstrated to inhibit tumor progression in various human cancers, including colorectal cancer, ovarian cancer, and thyroid cancer. However, the role of miR-150 in melanoma remains to be determined. In this study, we found that miR-150 was underexpressed in melanoma tissues and cell lines. Through transfection of miR-150 mimics, we found that miR-150 significantly inhibited the proliferation, migration, and invasion of melanoma cells. In mechanism, we found that MYB was a target of miR-150 in melanoma cells. Overexpression of miR-150 significantly inhibited mRNA and protein levels of MYB in melanoma cells. Moreover, there was an inverse correlation between the expression of miR-150 and MYB in melanoma tissues. We also showed that MYB was upregulated in melanoma tissues and cell lines. Through functional experiments, we found that restoration of MYB in miR-150-overexpressed melanoma cells rescued the proliferation, migration, and invasion. Therefore, our findings demonstrated that miR-150 suppressed the proliferation, migration, and invasion of melanoma cell by downregulating MYB.     

miR-147a通过抑制CCND1和CDK4的表达对膀胱癌细胞周期和增殖的影响

目的:探讨miR-147a在膀胱癌组织、细胞中的表达及对膀胱癌细胞增殖和细胞周期的影响,研究miR-147a靶向负性调控CCND1和CDK4的表达对膀胱癌细胞周期和增殖的影响。方法:通过qRT-PCR检测miR-147a在正常膀胱组织和膀胱癌组织及正常膀胱上皮细胞、膀胱癌细胞系中的表达;使用miR-147a mimics转染观察细胞特性变化;CCK-8检测方法观察细胞增殖能力变化;流式细胞术观察细胞周期变化;生物信息学方法分析miR-147a的靶基因,并将靶基因进行GO分类和KEGG分析,找到与增殖和周期相关的基因;通过western blot方法验证miR-147a的靶基因,使用双萤光素酶报告基因系统检测miR-147a对CCND1和CDK4的转录活性影响;使用CCND1和CDK4特异性siRNA观察它们对细胞周期的影响,使用miR-147a inhibitor进行回补实验。结果:同正常组织/细胞相比,miR-147a在膀胱癌组织/膀胱癌细胞系中表达水平显著降低（P＜0.05）,miR-147a能够使膀胱癌细胞发生G1/S期阻滞,细胞增殖能力降低;通过一系列生信分析找到两个与细胞增殖和周期相关的miR-147a的靶基因CCND1和CDK4;通过间接和直接实验验证CCND1和CDK4是miR-147a的靶基因;下调CCND1和CDK4能够使膀胱癌细胞发生G1/S期阻滞,同时抑制miR-147a的表达能够解除G1/S期阻滞。结论:miR-147a作为一个抑癌因子,可作为诊断膀胱癌的生物标志物;miR-147a通过抑制CCND1和CDK4的表达抑制膀胱癌细胞周期G1/S期进程并抑制膀胱癌细胞增殖。