miR-491-5p参与调节 人膀胱癌细胞系EJ对5-氟尿嘧啶的敏感性

目的探讨miR-491-5p对人膀胱癌细胞系EJ 5-氟尿嘧啶(5-fluorouracil,5-FU)敏感性的影响及初步机制。方法 RT-qPCR检测miR-491-5p在膀胱癌化疗敏感与耐药组织中表达水平。构建5-FU耐药的EJ/5-FU细胞系,并分别用RT-qPCR和Western blot检测miR-491-5p表达和AKT与STAT3磷酸化水平。将miR-491-5p抑制剂转入细胞系EJ或将miR-491-5p模拟物转入EJ/5-FU细胞,并在5-FU存在的条件下分别用CCK-8法、Annexin V-FITC/PI染色法、划痕法、Transwell小室法和Western blot检测细胞活性、凋亡、伤口愈合、迁移、侵袭和AKT与STAT3磷酸化水平。结果 miR-491-5p在化疗耐药组织和EJ/5-FU细胞系中表达显著降低(P0.01)。下调miR-491-5p表达后,5-FU对细胞系EJ的细胞活性、伤口愈合、迁移和侵袭的抑制作用和凋亡的促进作用均显著减弱(P0.01);上调miR-491-5p表达后,5-FU对EJ/5-FU细胞系的细胞活性、伤口愈合、迁移和侵袭的抑制作用和凋亡的促进作用均显著增加(P0.01)。AKT及STAT3磷酸化水平在EJ/5-FU细胞系中显著升高(P0.01);下调miR-491-5p后,细胞系EJ中AKT及STAT3磷酸化水平显著升高(P0.01);上调miR-491-5p后,EJ/5-FU细胞系中AKT及STAT3磷酸化水平显著降低(P0.01)。结论下调miR-491-5p表达降低细胞系EJ对5-FU的敏感性;上调miR-491-5p表达抑制EJ/5-FU细胞系对5-FU耐药性。miR-491-5p调节细胞系EJ 5-FU耐药性的过程中伴随着AKT及STAT3磷酸化的改变。     

沉默LncRNA TUG通过上调miR-24-5p表达增加乳腺癌细胞的放射敏感性

目的:探讨长链非编码RNA牛磺酸上调基因1(LncRNA TUG1)对乳腺癌细胞放射敏感性的影响并探究其可能作用机制.方法:选取2015年4月至2016年3月于本院就诊的45例乳腺癌患者为研究对象,根据放疗后病灶变化情况分为放射敏感组(25例)与放射抵抗组(20例),qRT-PCR检测两组患者乳腺癌组织中TUG1表达水...     

miR-150-5p通过调控DDR1表达对缺氧缺糖诱导的大鼠皮质神经细胞损伤的影响

目的:探讨miR-150-5p对缺氧缺糖(OGD)诱导的大鼠皮质神经细胞损伤的影响及分子机制.方法:设置OGD组、正常对照(Con)组、miR-NC组、miR-150-5p组、anti-miR-NC组、anti-miR-150-5p组、OGD+miR-NC组、OGD+miR-150-5p组、OGD+si-NC组、OGD...     

miR-224-5p靶向GABRE对人结肠癌细胞系SW480增殖的影响

目的 探讨miR-224-5p通过靶点GABRE对结直肠癌细胞系增殖的抑制作用和可能的调控机制。方法 从基因表达综合数据库（GEO）中检索并筛选GPL18058的microRNA(miRNA)表达阵列,筛选出结直肠癌与正常组织差异表达的miR-224-5p后,通过Target Scan Human数据库预测其下游靶点GABRE,并利用UALCAN分析GABRE在结直肠癌组织中的表达情况和结直肠癌预后关系。利用实时定量PCR(qRT-PCR)检测结直肠癌细胞系中的miR-224-5p和GABRE的表达水平。在结直肠癌细胞系SW480中,沉默miR-224-5p后,CCK-8法与克隆形成实验分析其增殖情况。RT-PCR和Western blot检测miR-224-5p对GABRE表达的影响。在SW480细胞中低表达GABRE,评估其对结直肠癌调节中的miR-224-5p的选择性作用。结果 在结直肠癌组织和细胞系中,miR-224-5p的表达异常上调,抑制其表达后,SW480细胞的增殖能力降低（P<0.05）。在结直肠癌组织和细胞系的基因和蛋白质水平上,miR-224-5p正调控GAB...     

miR-212-5p在肝癌组织中的表达及对HepG2细胞增殖、侵袭及迁移的影响

目的 探讨miR-212-5p在肝癌组织中的表达及对HepG2细胞增殖、侵袭及迁移的影响。方法应用qRT-PCR法检测96例肝癌组织及癌旁组织中miR-212-5p表达水平,同时设HepG2细胞组、miR-212-5pmimics组与miR-212-5pinhibitor组。培养72h后,采用MTT法检测细胞活力;流式细胞仪检测细胞凋亡水平;Transwell实验和划痕实验检测细胞侵袭与迁移水平;qRT-PCR法检测细胞miR-212-5p表达水平。结果 肝癌组织中miR-212-5p表达水平升高,肿瘤最大径≥2cm、TNM分期越高、浸润深度越深、病理级别越低、有淋巴结转移、有复发的肝癌患者miR-212-5p高表达率更高（P<0.05）。miR-212-5p模拟物能增强HepG2细胞增殖、侵袭及迁移能力,抑制HepG2细胞凋亡（P<0.05）;miR-212-5p抑制剂能抑制HepG2细胞活力、增殖、侵袭及迁移能力,促进HepG2细胞凋亡（P<0.05）。结论 miR-212-5p在肝癌组织中高表达,miR-212-5p可促进HepG2细胞增殖、侵袭及迁移能力,抑制...     

miR-218-5p靶向HMGB1参与脂多糖诱导的足细胞损伤

目的探究miR-218-5p、高迁移率蛋白B1(HMGB1)在脂多糖(LPS)诱导的小鼠足细胞损伤中的作用。方法将小鼠足细胞分为4组:正常对照组、LPS诱导组、HMGB1 shRNA+LPS组、miR-218-5p mimics+LPS组。Western blot和Real-time PCR分别检测各组HMGB1、TLR4、MyD88、TNF-α、IL-6、synaptopodin、ZO-1蛋白和mRNA表达水平;免疫荧光检测synaptopodin、ZO-1的表达和定位;Transwell检测足细胞迁移能力;双荧光素酶报告基因验证miR-218-5p和HMGB1的关系。结果 LPS刺激后,HMGB1、TLR4、MyD88表达明显升高,炎性因子TNF-α、IL-6表达升高,而足细胞标记蛋白synaptopodin、ZO-1表达降低,同时足细胞迁移能力明显增强。沉默HMGB1或过表达miR-218-5p可降低TLR4、MyD88,TNF-α、IL-6表达,增加synaptopodin、ZO-1表达,抑制足细胞迁移能力,缓解足细胞损伤。荧光素酶报告基因检测提示miR-218-5p可直接作用...     

敲除OIP5-AS1基因通过miR-7-5p/PARP1轴增强非小细胞肺癌细胞的化学敏感性

目的探讨OIP5-AS1基因对非小细胞肺癌(non-small cell lung cancer, NSCLC)细胞化学敏感性的作用及分子机制。方法采用CCK-8法检测正常肺细胞系BEAS-2B、肺癌细胞系A549和顺铂耐药肺癌细胞A549/DDP的半抑制浓度(IC50)值。应用RT-qPCR检测OIP5-AS1、miR-7-5p和PARP1的表达水平。生物信息学检测OIP5-AS1、miR-7-5p和PARP1的靶向关系,用荧光素实验进一步验证。Western blot法检测相关蛋白的表达;流式细胞术检测细胞凋亡情况;克隆形成检测细胞生长情况。结果 A549/DDP细胞中IC50值最高,且OIP5-AS1高表达,miR-7-5p低表达。miR-7-5p是OIP5-AS1的靶向调节基因之一,且为负调控关系。敲除OIP5-AS1抑制A549/DDP细胞的生长并增强化学敏感性,促进A549/DDP细胞凋亡。敲除OIP5-AS1下调PARP1可以增强A549/DDP细胞的化学敏感性,抑制NSCLC的生长和凋亡。结论 OIP5-AS1通过上调miR-7-5p或下调PARP1,增强A549/DD...     

miR-32-5p靶向ZEB1、ZEB2基因调控乳腺癌增殖和侵袭能力的机制

目的 探讨ZEB1和ZEB2在乳腺癌中的作用及miR-32-5 p对乳腺癌调控的分子机制.方法 通过Western blot和qRT-PCR检测乳腺癌和癌旁组织中ZEB1、ZEB2和miR-32-5 p的表达,筛选出ZEB1和ZEB2高表达的乳腺癌细胞系,采用Western blot和qRT-PCR检测敲减效率.应用克...     

miR-195-5p表达上调抑制肺癌细胞系A549的迁移和侵袭

目的探讨miR-195-5p对肺癌细胞系A549细胞迁移和侵袭的影响及其机制。方法实时荧光定量PCR检测肺癌组织及肺癌细胞系中miR-195-5p的表达;通过脂质体介导将miR-195-5p模拟物作用于A549细胞,用Transwell法检测细胞迁移和侵袭; Western blot检测细胞内上皮间质转化标志物及ZEB1的表达。结果相对于癌旁组织及人正常肺上皮细胞,miR-195-5p在肺癌组织及肺癌细胞系中低表达(P0. 001);过表达miR-195-5p可显著抑制A549细胞的迁移和侵袭(P0. 001),伴随E-cadherin蛋白表达的上调,N-cadherin和vimentin蛋白表达的下调(P0. 01);过表达miR-195-5p可抑制A549细胞ZEB1的表达(P0. 001)。结论 miR-195-5p可能通过下调ZEB1的表达,抑制肺癌细胞迁移和侵袭。     

5-杂氮-2'脱氧胞苷对肝癌细胞SMMC-7721 miR-1247-5p基因表达及其启动子区甲基化的影响

目的观察正常人肝细胞系LO_2和肝癌细胞系SMMC-7721中miR-1247-5p的表达,研究去甲基化药物5-杂氮-2'脱氧胞苷(5-Aza-CdR)对肝癌细胞系SMMC-7721中miR-1247-5p表达及其基因启动子区Cp G岛甲基化水平的影响。方法用不同浓度(0、5和10μmol/L)去甲基化药物5-杂氮-2'脱氧胞苷处理SMMC-7721细胞,用甲基化特异性PCR法检测miR-1247-5p基因启动子区甲基化水平;用SYBR Green qReal Time PCR法检测miR-1247-5p的表达。结果与正常人肝细胞系LO_2相比,肝癌细胞系SMMC-7721中miR-1247-5p表达降低(P0.05)且其基因启动子区Cp G岛甲基化水平高;经去甲基化药物干预后miR-1247-5p的表达较对照组有明显上调(P0.01),且其基因启动子区Cp G岛甲基化水平降低。结论 miR-1247-5p基因甲基化调控可能参与了肝癌的发生。     

Roles of the miR-139-5p/CCT5 axis in hepatocellular carcinoma: a bioinformatic analysis

Background: MiRNAs are pivotal regulators involved in proliferation, apoptosis, invasion, metastasis, epithelial-mesenchymal transition (EMT), angiogenesis, drug resistance and autophagy in hepatocellular carcinoma (HCC). The aim of this study was to investigate the influence of miR-139-5p and its target genes on the outcomes of HCC.Methods: Survival analysis of miR-139-5p in HCC was conducted in Kaplan-Meier plotter. Target genes of miR-139-5p were identified in TargetScan, miRTarBase and starBase. Gene Expression Omnibus (GEO) series were used for the validation of miR-139-5p target genes. Cox proportional regression model was also established.Results: In Kaplan-Meier plotter, 163 HCC patients were included. MiR-139-5p downregulation was significantly associated with unfavorable overall survival (OS) and disease-free survival (DFS) in HCC patients (all P < 0.001). MiR-139-5p was significantly downregulated in HCC tumors and human hepatoma cell lines (all P < 0.05). As a target gene of miR-139-5p, CCT5 was overexpressed in HCC tumor tissues and peripheral blood mononuclear cells (all P < 0.05). A negative correlation between CCT5 and miR-139-5p was found in TCGA dataset. CCT5 overexpression was significantly associated with worse OS in HCC patients (P < 0.001), which was validated in the {"type":"entrez-geo","attrs":{"text":"GSE14520","term_id":"14520"}}GSE14520 dataset (P = 0.017). CCT5 mRNA was significantly overexpressed in HCC patients with alpha-fetoprotein (AFP) > 300 ng/ml, BCLC staging B-C, TNM staging III and main tumor size > 5 cm (all P < 0.05). According to the Cox regression model of CCT5-interacting genes, HCC patients with high risk had poor OS compared to those with low risk in the TCGA dataset (P < 0.001), with the 1-year, 3-year, and 5-year ROC curves of an area under the curve (AUC) equal to 0.704, 0.662, and 0.631, respectively.Conclusions: MiR-139-5p suppresses HCC tumor aggression and conversely correlated with CCT5. The miR-139-5p/CCT5 axis might perform crucial functions in the development of HCC.     

Higher expression of miR-150-5p promotes tumorigenesis by suppressing LKB1 in non-small cell lung cancer

Lung cancer is one of the most malignant tumors that can form in the human. MicroRNAs (MiRNAs) play significant role in tumor progression. Human lung cancer tissues and cell lines were used to determine miR-150-5p respectively, and Liver Kinase B1 (LKB1) expression using quantitative real-time PCR (qRT-PCR). The data analysis website Kaplan-Meier Plotter (database obtained from The Cancer Genome Atlas) was used to perform a survival analysis with LKB1 levels. Using the appropriate assays, the function of miR-150-5p was also detected in cellular proliferation, migration and cell apoptosis as well as cell cycle. Results revealed that miR-150-5p was upregulated in non-small cell lung cancer (NSCLC) tissue and cell lines. In NSCLC, miR-150-5p promoted cellular proliferation and migration, but decreased cellular apoptosis. Conversely, miR-150-5p inhibition suppressed cellular growth. These results further revealed a network of cellular signaling for miR-150-5p to target LKB1. Ectopic expression of LKB1 can mitigate the tumor-promoting function of miR-150-5p. Collectively, these results indicated that miR-150-5p may promote lung cancer by inhibiting the suppressor gene LKB1 in NSCLC.     

MicroRNA-485-5p suppresses cell proliferation and invasion in hepatocellular carcinoma by targeting stanniocalcin 2

Increasing evidences indicate that dys-regulation of MicroRNAs contributes to hepatocellular carcinoma. However, the roles of miR-485-5p in HCC are still largely unexplored. In the present study, our quantitative real-time PCR analysis found that miR-485-5p was significantly down-regulated in 50 pairs of human HCC tissues. Moreover, the reduced expression of miR-485-5p was significantly correlated with larger tumor size and more tumor number in patients with HCC. In vitro studies further showed that overexpression of miR-485-5p mimics could inhibit, while its antisense oligos promote cell proliferation and invasion. Results from the dual-luciferase reporter gene assays and western blot further showed that stanniocalcin 2 was a direct target of miR-485-5p. Therefore, our data suggest a novel role for miR-485-5p in the regulation of HCC progression.     

miR-593-5p inhibit cell proliferation by targeting PLK1 in non small cell lung cancer cells

Worldwide, lung cancer has the highest rates of mortality and morbidity, with the majority of its pathology attributable to non-small cell lung cancer (NSCLC). MicroRNAs are pivotal in the occurrence and development of cancer. However, the role of miRNA-593-5p in the progression of NSCLC is not clear. In this study, we investigate, in vitro, whether miRNA-593-5p inhibits NSCLC cell proliferation. To clarify its specific mechanism of inhibition, we used bioinformatics to predict its target genes and identified PLK1. Luciferase reporter assay confirmed the binding of miR-593-5p to the PLK1 3′-UTR in a sequence-specific manner in NSCLC cells. Additionally, we also found through Western blot and quantitative RT-PCR that miR-593-5p down-regulates the expression of PLK1 protein. Finally, PLK1 overexpression was shown to disinhibit NSCLC cell proliferation. Taken together, this evidence suggests that miR-593-5p inhibits NSCLC cell proliferation by inhibiting PLK1 expression.     

miR-483-5p通过上调IGF2基因转录促进肝癌细胞生长、迁移与侵袭

目的:探讨miR-483-5p对人胰岛素样生长因子2(IGF2)基因P3启动子驱动的m RNA(P3 m RNA)表达的影响及其在肝细胞癌发生发展中的作用。方法:(1)采用real-time PCR检测人肝癌细胞株Huh7、Hep3B、Bel-7402、Hep G2和SMMC-7721,人正常肝细胞株HL-7702,83例人肝细胞癌组织和配对的癌旁组织,22例正常肝组织中miR-483-5p和P3 m RNA的表达水平,并应用Pearson相关分析评估P3 m RNA与miR-483-5p表达水平之间的关系。(2)将IGF2基因P3 m RNA的5’端非翻译区(5’UTR)克隆入p GL3启动子载体,构建P3 m RNA 5’UTR野生型(p GL3-P3-5’UTR-WT)及P3 m RNA 5’UTR突变型(p GL3-P3-5’UTR-MUT)重组萤光素酶报告质粒,将其分别与miR-483-5p mimic、miR-483-5p inhibitor及scrambled control共转染He La、293T及Huh7细胞,采用双萤光素酶报告系统检测萤光素酶活性。(3)分别将miR-483-5p mimic、miR-483-5p inhibitor及scrambled control转染Huh7及Hep3B肝癌细胞,应用real-time PCR检测这2种肝癌细胞P3 m RNA表达水平的变化。(4)应用real-time PCR检测肝癌细胞Huh7及Hep3B的细胞核和细胞质中miR-483-5p的表达水平;应用核连缀实验(nuclear run-on assay)分析miR-483-5p对P3 m RNA转录的影响;应用RNA稳定性实验分析miR-483-5p对P3 m RNA稳定性影响。(5)应用体外细胞功能实验研究miR-483-5p对Huh7肝癌细胞生长、凋亡、迁移与侵袭能力的影响。结果:(1)5种肝癌细胞株miR-483-5p及P3 m RNA表达水平均明显高于正常肝细胞株HL-7702(P0.01),肝细胞癌组织中miR-483-5p及P3 m RNA表达水平均明显高于配对的癌旁组织及正常肝组织(P0.01);线性相关分析显示,在5种肝癌细胞株及肝细胞癌组织中,P3 m RNA表达水平均与miR-483-5p水平呈正相关。(2)萤光素酶实验显示,miR-483-5p与P3m RNA 5’UTR的同源位点互补结合可促进P3 m RNA的表达。(3)瞬时转染实验显示,过表达miR-483-5p呈剂量依赖性促进Hep3B和Huh7肝癌细胞P3 m RNA表达水平的增高。(4)miR-483-5p表达实验显示,成熟miR-483-5p存在于肝癌细胞Hep3B和Huh7的细胞质和细胞核中;核连缀实验显示,miR-483-5p诱导Huh7肝癌细胞核中新生P3 m RNA转录;RNA稳定性实验表明,miR-483-5p不改变Huh7肝癌细胞P3 m RNA稳定性。(5)体外细胞功能实验显示,miR-483-5p促进Huh7肝癌细胞增殖,抑制其凋亡,并增强迁移与侵袭能力。结论:miR-483-5p高表达可部分通过上调IGF2基因P3 m RNA转录促进肝癌细胞生长、迁移与侵袭,进而参与肝细胞癌发生。     

miR-9-5p attenuates ischemic stroke through targeting ERMP1-mediated endoplasmic reticulum stress

Ischemic stroke (IS) is a cerebrovascular disease with serious neurological function impairment, which may activate endoplasmic reticulum (ER) stress. However, the underlying regulatory mechanism of ER stress under IS remains unclear. miR-9-5p is enriched in the brain tissues and plays a role in the pathological process of IS. Therefore, the purpose of this study is to explore the effect of miR-9 on ER stress and underlying mechanism in IS. Here, a middle cerebral artery occlusion (MCAO) rat model was utilized to examine the alteration of brain pathology, and the expressions of miR-9 and ER stress-related proteins. Then SH-SY5Y cells with oxygen-glucose deprivation (OGD) were performed to further evaluate the functional role of miR-9 and preliminary mechanism. The results showed that miR-9 levels were decreased in the ischemic region of rats after MCAO. MCAO significantly increased the brain infract volume, reduced Nissl bodies and cell apoptosis, and increased ER stress-related proteins (ERMP1, GRP78, p-PERK, p-eIF2α and CHOP). Furthermore, overexpression of miR-9 by miR-9 mimics increased cell viability, inhibited LDH activity and cell apoptosis, and inactivated ER stress in OGD-neurons. Luciferase activity results showed that miR-9 negatively regulated ERMP1 expression by directly targeting ERMP1 3′ UTR. Subsequently, we found that ERMP1 overexpression reversed the inhibition of miR-9 on GRP78-PERK−CHOP pathway in OGD neurons. In summary, our results suggest that the attenuation of miR-9 on ischemic injury may be involved in targeting ERMP1-mediated ER stress, which provides an available target for IS treatment.