miR-26b-5p suppresses proliferation and promotes apoptosis in multiple myeloma cells by targeting JAG1

Background

Though the levels of diagnosis and treatment of multiple myeloma (MM) have been largely improved recent years, the prognosis of these patients remain unacceptable. It is urgent for us to discover the exact mechanism and determine some new indicators for MM. MiRNAs play a critical role in the occurrence and progression of cancers, including MM. MiR-26b-5p has been reported to be closely related to cells proliferation in human pulmonary cancer, hepatocellular carcinoma and so on.

miR-551b-3p在胃癌组织中低表达并抑制胃癌细胞系HGC-27的增殖、迁移和侵袭

目的探讨miR-551b-3p在胃癌中的表达变化情况,及其对胃癌细胞功能的影响。方法用real-time PCR的方法检测60例胃癌组织及其对应的癌旁组织中miR-551b-3p的表达量,使用miR-551b-3p模拟物(miR-551b-3p mimic)转染胃癌细胞系HGC-27,CCK-8法检测细胞增殖;划痕愈合实验检测细胞迁移;Transwell法检测细胞侵袭。结果 1)miR-551b-3p在胃癌癌症组织中的表达明显低于癌旁组织(P0.05)。2)过表达miR-551b-3p mimic可以明显减弱胃癌细胞系HGC-27的增殖、迁移和侵袭能力。结论 miR-551b-3p在胃癌组织中低表达,并且抑制胃癌细胞系HGC-27的增殖、迁移和侵袭,可能与胃癌发生发展密切相关。     

lncRNA MALAT1靶向调控miR-146b-5p影响膀胱癌细胞侵袭和迁移

目的:探讨长链非编码RNA(lncRNA)肺腺癌转移相关转录因子1(MALAT1)靶向微小RNA-146b-5p(miR-146b-5p)影响膀胱癌细胞侵袭和迁移的机制。方法:在膀胱癌BIU-87细胞中转染MALAT1 siRNA,以real-time PCR方法测定转染效果,Transwell法测定侵袭及迁移能力,Western blot法检测细胞中上皮-间充质转化(EMT)相关蛋白波形蛋白(vimentin)、上皮型钙黏蛋白(E-cadherin)和迁移侵袭相关蛋白基质金属蛋白酶-2(MMP-2)蛋白表达的变化。生物信息学软件预测MALAT1与miR-146b-5p有靶向互补位点,利用双萤光素酶报告系统鉴定靶向关系。用real-time PCR方法检测下调MALAT1后BIU-87细胞中miR-146b-5p表达的变化。将MALAT1 siRNA和miR-146b-5p inhibitor共转染至BIU-87细胞中,用上述方法分析细胞侵袭、迁移及vimentin、E-cadherin和MMP-2蛋白表达的变化。结果:转染MALAT1 siRNA可明显下调BIU-87细胞中MALAT...     

Combination of tumor suppressor miR-20b-5p,miR-30a-5p,and miR-196a-5p as a serum diagnostic panel for renal cell carcinoma

BackgroundRenal cell carcinoma (RCC) accounts for 3 % of cancer patients. Early detection influences the therapeutic strategy and significantly improves patients’ survival rates. Stable existing circulating miRNAs could be a promising diagnostic biomarker.MethodsPreviously our team demonstrated the anti-tumor effect of miR-20b-5p, miR-30a-5p and miR-196a-5p in RCC tissue and cell lines. Here, based on 110 RCC patients and 110 health control, we investigated serum expression of these three miRNAs in the testing set and the validation set separately by using quantitative real-time PCR. A three-miRNA panel with high diagnostic efficiency was constructed. Correlations between these miRNAs and clinical parameters were investigated. Additionally, the TCGA dataset and bioinformatic analysis are used for the functional exploration of these miRNAs.ResultsSerum expression levels of miR-20b-5p, miR-30a-5p were significantly reduced in RCC patients, while miR-196a-5p expression level was up-regulated (p < 0.001). miR-20b-5p, miR-30a-5p and miR-196a-5p had moderate diagnostic ability for RCC (AUC = 0.807, 0.766 and 0.719 in the testing set, respectively). The AUC of the three-miRNA panel was 0.949 in the testing set and 0.938 in the validation set. Specifically, the serum expression level of miR-196a-5p was significantly down-regulated in RCC patients with higher Fuhrman grade (p = 0.051). TCGA dataset analysis showed that the three-miRNA panel probably participated in RCC by targeting ITGA4 and NRP2.ConclusionThe three-miRNA panel could serve as a promising non-invasive biomarker for RCC detection.     

miR-15a-5p抑制人肝癌SMMC-7721细胞增殖与迁移

目的:观察高表达的miR-15a-5p对人肝细胞癌SMMC-7721细胞增殖和迁移能力的影响。方法:化学合成加入EcoRⅠ和HindⅢ酶切位点的miR-15a-5p寡聚核苷酸,并进行测序确认;利用pcDNA6.2-GW/EmGFP质粒构建miR-15a-5p真核表达载体,瞬时转染SMMC-7721细胞,实时荧光定量PCR检测miR-15a-5p的表达;CCK-8法和台盼蓝染色活细胞计数检测SMMC-7721细胞的增殖能力,划痕实验检测细胞迁移能力的变化。结果:设计的miR-15a-5p序列与寡核苷酸测序结果匹配达100%;真核表达质粒瞬转后人肝癌SMMC-7721细胞miR-15a-5p的表达量与对照组相比显著增加(P0.05);miR-15a-5p高表达SMMC-7721细胞的增殖能力与对照组相比均显著下降(P0.05);miR-15a-5p高表达组细胞迁移速度低于对照组。结论:高表达的miR-15a-5p可抑制人肝癌SMMC-7721细胞的增殖和迁移能力。     

MicroRNA-146b-5p suppresses cholangiocarcinoma cells by targeting TRAF6 and modulating p53 translocation

BackgroundIn view of the poor prognosis and high mortality of cholangiocarcinoma, there is a need for new therapeutic strategies. This study aims to reveal the biological function of miR-146b-5p in cholangiocarcinoma cell and its possible mechanism.MethodsThe expression level and prognostic information on miR-146b-5p in cholangiocarcinoma were obtained in TCGA database. The biological function of miR-146b-5p on proliferation and vitality of cholangiocarcinoma cell HUCCT-1 was examined by EdU and MTT assay, and the apoptosis of HUCCT-1 cells transfected with miR-146b-5p mimic, mimic control, inhibitor, inhibitor control was detected by flow cytometry analysis. The western blot was done to evaluate the effect of miR-146b-5p targeting substrate and the expression of p53 in whole-cell protein and mitochondria fractions.ResultsOur finding revealed that miR-146b-5p expression in patients with CHOL was lower than the normal group(p＜0.001). MiR-146b-5p expression was down-regulated in human cholangiocarcinoma HUCCT-1 and RBE cells compared to normal control HIBEC and other cancer cells. The miR-146b-5p mimic could inhibit HUCCT-1 cell proliferation (p＜0.05) and promote HUCCT-1 cell apoptosis significantly (p＜0.05). The results of western blot showed that miR-146b-5p mimic could directly target TRAF6 3′UTR region and up-regulate the expression of p53 in mitochondria and miR-146b-5p inhibitor could down-regulated the level of p53 in mitochondria.ConclusionMiR-146b-5p is a cholangiocarcinoma suppressor by inhibiting cell proliferation and promoting cell apoptosis with targeting TRAF6, possibly via modulating p53 translocation to mitochondria.     

miR-92b-3p促进人脐带间充质干细胞的成骨分化

目的探究miR-92b-3p在人脐带间充质干细胞(h UCMSCs)成骨分化过程中的作用及其作用机制。方法通过转染h UCMSCs过表达或抑制miR-92b-3p,qRT-PCR检测各组成骨相关基因OCN、RUNX2、OSTERIX mRNA表达以明确miR-92b-3p对h UCMSCs成骨分化的体外调控作用,用茜素红染色比较各处理组的骨化能力。通过生物信息学分析miR-92b-3p可能的靶基因,并通过双荧光素酶基因报告系统以及Western blot验证。结果 miR-92b-3p在h UCMSCs成骨过程中表达量较对照组明显升高(P0.05);过表达miR-92b-3p能促进h UCMSCs体外成骨分化及体内的异位成骨能力(P0.05);而抑制miR-92b-3p则能降低h UCMSCs体外成骨分化(P0.05)。过表达miR-92b-3p能显著降低DKK1的表达量(P0.05),抑制则能明显提高DKK1的表达(P0.05)。结论 miR-92b-3p可通过抑制DKK1表达,促进h UCMSCs成骨分化。     

miR-135b-3p调控XAF1表达影响甲状腺癌细胞的迁移、侵袭和放射增敏性

目的探讨miR-135b-3p对甲状腺癌细胞迁移、侵袭和放射敏感性的影响以及其可能的调控机制。方法培养正常甲状腺细胞Nthy-ori 3-1、甲状腺癌细胞K1和TPC-1,RT-qPCR检测细胞中miR-135b-3p表达,Western blot检测细胞中X染色体连锁凋亡抑制蛋白相关因子1(XAF1)表达。转染anti-miR-135b-3p至TPC-1细胞抑制miR-135b-3p表达,Transwell、Western blot及克隆形成实验分别检测抑制miR-135b-3p表达对TPC-1细胞迁移和侵袭、E-cadherin和MMP-2蛋白表达及对TPC-1细胞放射敏感性的影响。双荧光素酶报告基因实验验证miR-135b-3p与XAF1之间的靶向调控关系。结果与Nthy-ori 3-1细胞相比,K1和TPC-1细胞中miR-135b-3p表达水平显著升高(P<0.05),XAF1蛋白表达水平显著降低(P<0.05)。抑制miR-135b-3p表达可抑制TPC-1细胞的迁移和侵袭能力(P<0.05),促进TPC-1细胞E-cadherin蛋白表达(P<0.05),抑制MMP-2蛋白表达(P<0.05),增强TPC-1细胞的放射敏感性(P<0.05)。miR-135b-3p靶向负调控XAF1表达。抑制XAF1表达可降低抑制miR-135b-3p表达对TPC-1细胞迁移、侵袭及放射敏感性的影响。结论miR-135b-3p通过下调XAF1表达促进甲状腺癌细胞的迁移和侵袭能力,并降低其放射增敏性,是甲状腺癌的潜在治疗靶点。     

MiR-146a调节TRAIL不敏感的乳腺癌细胞迁移及其分子机制

目的 研究miR-146a及其靶基因EGFR对乳腺癌细胞迁移的影响.方法 用终浓度为50、100、200和500 μg/L的重组可溶性TRAIL(rsTRAIL)持续刺激对TRAIL敏感的MDA-MB-231细胞4周,筛选得到TRAIL不敏感的乳腺癌细胞MDA-MB-231/TR.RT-PCR检测miR-146a的表达;Transwell实验以及划痕实验检测乳腺癌细胞的迁移能力;双荧光素酶报告基因分析以及Western blot鉴定MDA-MB-231/TR细胞中miR-146a与EGFR基因的靶向调控关系;Western blot检测DR4、DR5、IRAK1、CXCR4、p-IκBα、IκBα、caspase 8和caspase 3的蛋白表达水平;染色质免疫共沉淀技术(ChIP)分析MDA-MB-231和MDA-MB-231/TR细胞中NF-κB P65亚基与miR-146a启动子区的结合情况.结果 TRAIL细胞毒作用不敏感的人乳腺癌细胞系MDA-MB-231/TR中miR-146a的表达降低,并引起其靶基因EGFR的表达增加,最终导致TRAIL不敏感的乳腺癌细胞迁移能力增强.同时发现NF-κB参与miR-146a低表达的调控.结论 miR-146a对TRAIL不敏感的乳腺癌细胞迁移起重要的调节作用.     

宫颈癌组织miR-574-5p的表达及其下调后对宫颈癌SiHa细胞的影响

目的探讨宫颈癌患者组织中miR-574-5p的表达及其下调时对宫颈癌Si Ha细胞增殖、凋亡和迁移的影响。方法用实时荧光定量PCR测定80例宫颈癌组织中miR-574-5p水平。将miR-574-5p抑制物转染宫颈癌Si Ha细胞,四甲基偶氮唑盐比色法(MTT法)检测细胞增殖能力,流式细胞仪检测细胞凋亡率,Tanswell迁移实验检测细胞侵袭能力。结果宫颈癌组织中miR-574-5p相对表达水平高于正常宫颈组织(P0.05);高表达的miR-574-5p与肿块大小、临床分期、病理分级和淋巴结转移有关(P0.05);转染miR-574-5p抑制物组与空白组及阴性对照组相比,Si Ha细胞增殖能力下降(P0.05);细胞凋亡率明显增加(P0.05);转染后细胞穿膜能力明显减弱(P0.05)。结论 miR-574-5p的高表达与宫颈癌的进展有关,下调miR-574-5p的表达抑制了宫颈癌Si Ha细胞的增殖和迁移,促进其凋亡,有望成为宫颈癌基因治疗的靶点。     

Allele-specific regulation of DISC1 expression by miR-135b-5p

Disrupted-in-schizophrenia-1 (DISC1) gene has been established as a risk factor for various neuropsychiatric phenotypes. Both coding and regulatory variants in DISC1 have been identified and associated with these phenotypes in genetic studies. MicroRNAs (miRNAs) are important regulators of protein coding genes. Since the miRNA-mRNA target recognition mechanism is vulnerable to disruption by DNA polymorphisms, we investigated whether polymorphisms in the DISC1 3′UTR affect binding of miRNAs and lead to allele-specific regulation of DISC1. We identified four predicted polymorphic miRNA target sites in the DISC1 3′UTR, and demonstrated that miR-135b-5p regulates the level of DISC1 mRNA. Moreover, DISC1 regulation by miR-135b-5p is allele specific: miR-135b-5p only binds to the major allele (A) of rs11122396, not to the minor allele (G). Thus, the G allele may be functionally related to the DISC1-associated phenotypes by abolishing regulation by miR-135b-5p, leading to elevated DISC1 levels.     

PM2.5通过p38 MAPK信号通路影响血管平滑肌细胞增殖和迁移

目的:研究细颗粒物(PM2.5)对血管平滑肌细胞增殖和迁移的影响,以及p38 MAPK信号通路在其中的作用。方法:体外培养人血管平滑肌细胞,分为对照组和不同浓度PM2.5染毒组,分别用PBS及6.25、12.5和25 mg/L的PM2.5作用于细胞,用CCK-8法和EdU染色法检测细胞增殖能力的变化,用划痕实验和Transwell法检测细胞的迁移能力,然后根据结果选取PM2.5最强作用浓度染毒细胞,在不同时点用Western blot法检测p38MAPK信号分子的磷酸化改变,并观察用特异性抑制剂阻断p38 MAPK信号后细胞在PM2.5刺激下的增殖和迁移情况。结果:与对照组比较,PM2.5染毒可明显促进血管平滑肌细胞的增殖和迁移能力,在设定的浓度范围内以12.5 mg/L浓度组的作用最为明显(P<0.05)。Western blot结果显示,12.5 mg/L PM2.5染毒可上调血管平滑肌细胞p38 MAPK的磷酸化水平;而加入p38 MAPK抑制剂SB203580预处理后,PM2.5诱导的细胞增殖和迁移明显受到抑制,说明p38 MAPK可能介导PM2.5的毒性作用。结论:PM...     

miR-21 and miR-146a: The microRNAs of inflammaging and age-related diseases

The first paper on “inflammaging” published in 2001 paved the way for a unifying theory on how and why aging turns out to be the main risk factor for the development of the most common age-related diseases (ARDs). The most exciting challenge on this topic was explaining how systemic inflammation steeps up with age and why it shows different rates among individuals of the same chronological age. The “epigenetic revolution” in the past twenty years conveyed that the assessment of the individual genetic make-up is not enough to depict the trajectories of age-related inflammation. Accordingly, others and we have been focusing on the role of non-coding RNA, i.e. microRNAs (miRNAs), in inflammaging. The results obtained in the latest 10 years underpinned the key role of a miRNA subset that we have called inflammamiRs, owing to their ability to master (NF-κB)-driven inflammatory pathways. In this review, we will focus on two inflammamiRs, i.e. miR-21−5p and miR-146a-5p, which target a variety of molecules belonging to the NF-κB/NLRP3 pathways. The interplay between miR-146a-5p and IL-6 in the context of aging and ARDs will also be highlighted. We will also provide the most relevant evidence suggesting that circulating inflammamiRs, along with IL-6, can measure the degree of inflammaging.     

MicroRNA-629-5p promotes osteosarcoma proliferation and migration by targeting caveolin 1

Osteosarcoma is a highly malignant tumor that occurs in the bone. Previous studies have shown that multiple microRNAs (miRNAs) regulate the development of osteosarcoma. This study aimed to explore the role of miR-629-5p and its target gene, caveolin 1 (CAV1), in osteosarcoma development. To analyze the expression of miR-629-5p and CAV1 mRNA in osteosarcoma tissues and cell lines, qRT-PCR analysis was performed. Dual-luciferase reporter experiments were subsequently performed to validate the relationship between CAV1 and miR-629-5p. CCK8 assay was used to measure osteosarcoma cell proliferation, and wound-healing assay was performed to study their migratory phenotype. Our findings revealed that miR-629-5p was overexpressed in osteosarcoma tissues and cells, and thereby enhanced cell proliferation and migration. Further, we validated that miR-629-5p targets CAV1 mRNA directly. CAV1 expression, which was negatively correlated with miR-629-5p expression, was found to be downregulated in osteosarcoma tissue samples. Moreover, our data showed that an increase in CAV1 level led to a decline in osteosarcoma cell proliferation and migration, which could be rescued by miR-629-5p upregulation. Overall, our study confirmed that miR-629-5p promoted osteosarcoma proliferation and migration by directly inhibiting CAV1.     

黄芩苷抑制大鼠血管平滑肌细胞增殖和新生内膜肥厚

目的 探讨黄芩苷对大鼠血管平滑肌细胞（VSMC）增殖和内皮损伤诱导的新生内膜形成的影响及其机制。方法 采用细胞培养、MTT分析、Western blot及免疫组织化学等方法研究黄芩苷的作用机制。结果 黄芩苷可呈浓度依赖性地抑制血小板源生长因子（PDGF）诱导的VSMC增殖,降低增殖细胞核抗原（PCNA）的表达,阻断PDGF受体的激活和MEK/ERK信号通路的活化。整体实验显示,黄芩苷可预防球囊损伤诱导的血管新生内膜肥厚,明显降低内膜/中膜面积（I/M）比值（P<0.01）;PCNA、细胞间黏附分子（ICAM-1）和血管黏附分子（VCAM-1）蛋白的表达也明显减少（P<0.01）。结论 黄芩苷通过抑制VSMC增殖而阻止球囊损伤诱导的大鼠血管内膜增生。