miR-34a在心血管疾病中的作用及机制研究进展

微小RNA(miR)是心血管疾病发生发展的重要调控因子。其中,miR-34a因广泛参与心血管疾病的病理生理过程成为目前研究热点。在冠状动脉粥样硬化性心脏病等心血管疾病中均存在miR-34a的异常表达。本文就miR-34a对心血管疾病的作用及其机制研究进展进行综述,为寻求心血管疾病标志物及治疗靶点提供新思路。     

七氟醚通过上调miR-34a抑制结直肠癌细胞的迁移和侵袭的机制研究

目的研究七氟醚对人结直肠癌HCT116细胞迁移和侵袭能力的影响,并探讨其分子机制.方法以细胞计数法(CCK-8)检测七氟醚对HCT116细胞增殖能力的影响;采用实时荧光定量PCR(qRT-PCR)检测细胞中miR-34a表达水平, Transwell实验检测细胞迁移和侵袭能力,蛋白免疫吸附法(Western blot)检测细胞中基质金属蛋白酶-2(matrix metalloprotease,MMP-2)和基质金属蛋白酶-9(MMP-9)蛋白表达水平.结果通过CCK-8实验筛选出七氟醚的作用浓度为4%.以4%七氟醚处理HCT116细胞4h后miR-34a表达水平升高了79%.转染miR-34a inhibitor后,细胞中miR-34a的表达水平下降了81%.七氟醚干预后迁移细胞数由(97.75±16.10)降低到(36.60±8.58),侵袭细胞数由(64.22±6.25)降低到(26.48±3.10),MMP-2蛋白表达水平由(0.68±0.11)下调到(0.24±0.04), MMP-9蛋白表达水平由(0.48±0.07)下调到(0.13±0.02);而抑制miR-34a的表达后,迁移细胞数由(40.15±9.02)提高到(88.65±12.74),侵袭细胞数由(26.12±3.02)提高到(59.24±4.68),MMP-2蛋白表达水平由(0.22±0.03)上调到(0.61±0.09),M M P-9蛋白表达水平由(0.14±0.03)上调到(0.43±0.06).结论七氟醚通过上调miR-34a的表达抑制人结直肠癌HCT116细胞的迁移和侵袭,可能与下调MMP-2和MMP-9蛋白表达有关.     

非小细胞肺癌组织miR-34a的表达及其对H1299细胞增殖的影响

目的观察非小细胞肺癌(NSCLC)组织中miR-34a的表达情况及其对NSCLC细胞系H1299增殖的影响。方法 RT-PCR方法检测miR-34a在NSCLC组织和NSCLC细胞系H1299中的表达情况。克隆形成实验及MTT增殖实验检测miR-34a对NSCLC细胞系H1299增殖能力的影响;生物信息学方法预测miR-34a可能的功能性靶基因,并采用荧光素酶报告基因实验验证预测的功能性靶基因。Western印迹检测miR-34a对预测靶基因表达的影响。结果相比正常组织而言,NSCLC组织和细胞系H1299中miR-34a表达均显著下降(P0.05);转染miR-34a可显著抑制NSCLC细胞系H1299的增殖能力(P0.05),而转染miR-34a抑制剂可增加NSCLC细胞系H1299的增殖能力(P0.05)。生物信息学预测显示Notch1是miR-34a可能的功能性靶基因,且得到荧光素报告实验结果证实。Western印迹结果显示转染miR-34a可显著抑制NSCLC细胞系H1299中Notch1的表达。结论 miR-34a可通过调节Notch1的表达,进而抑制NSCLC细胞的增殖。     

miR-513b-5p表达变化对结肠癌细胞增殖、迁移的影响及机制探讨

目的观察结肠癌(CC)组织、细胞中微小RNA-513b-5p(miR-513b-5p)的表达变化,以及miR-513b-5p对CC细胞增殖和迁移的影响,并探讨相关机制。方法采用qRT-PCR法检测CC组织、癌旁组织和CC细胞株(HCT116、RKO、SW480、Lo Vo、SW620)、人结肠成纤维细胞(CCD-112CoN)中的miR-513b-5p。将HCT116细胞分为miR-con组(转染miR-con)、miR-513b-5p抑制剂组(转染miR-513b-5p inhibitors);采用CCK-8试剂盒和Transwell实验检测细胞增殖和迁移能力。通过生物信息预测miR-513b-5p在信号传导及转录激活因子3(STAT3)上的结合位点;分别将野生型STAT3(STAT3-WT)质粒、突变型STAT3(STAT3-MUT)质粒和miR-513b-5p mimic、miR-con转染HCT116细胞;用荧光素酶检测试剂盒检测荧光素酶活性,采用Western blotting法检测STAT3蛋白。取部分HCT116细胞,分为miR-con组(转染miR-con)、miR-5...     

miR-369-3p在山荷叶素调控甲状腺癌细胞增殖、迁移中的作用

目的 观察山荷叶素对甲状腺癌细胞增殖及迁移的影响,并探讨miR-369-3p在其中的作用.方法 将人甲状腺癌细胞SW579随机分为对照组及山荷叶素2.5μmol/L组、5.0μmol/L组、10.0μmol/L组,分别予以DMEM培养基及2.5、5.0、10.0μmol/L山荷叶素处理24 h,以CCK-8法、平板克隆...     

miR-34a逆转非小细胞肺癌A549/DDP细胞对顺铂的耐药性及其机制

目的探讨过表达miR-34a对非小细胞肺癌A549/DDP细胞顺铂(DDP)耐药性的影响及可能机制。方法成功构建过表达miR-34a的真核载体p CDNA3.1+miR-34a后,将A549/DDP细胞分为对照组(无转染)、空转染组(转染空质粒)和过表达组(转染p CDNA3.1+miR-34a),采用实时荧光定量PCR(q PCR)法检测转染24、48、72及96 h后各组miR-34a水平;给予不同浓度DDP(2、4、8、16、32和64μg/ml)处理48 h后采用CCK-8法比较各组对DDP的敏感性,流式细胞仪PI/Annexin V双染法检测各组转染48、96 h后的凋亡率,分别采用Western印迹检测各组转染48、96 h后常见耐药基因的表达情况。结果 A549/DDP细胞的miR-34a水平均低于其亲本细胞A549和正常支气管上皮细胞系HBE(P0.05);与其余两组相比,过表达组转染后的miR-34a水平升高,且对A549/DDP细胞的增殖抑制率升高(P0.05);过表达组的半数抑制浓度均低于其余两组,过表达组转染48、96 h后的凋亡率高于其余两组,而转染48 h后的P-糖蛋白、多药耐药相关蛋白1及肺耐药相关蛋白的水平低于其余两组(P0.05);对照组和空转染组以上指标的差异均无统计学意义(P0.05)。结论 A549/DDP细胞中miR-34a水平较低,通过真核载体将其过表达后可抑制增殖率并提高其对DDP的敏感性,可能与其诱导凋亡及降低耐药基因的表达有关。     

冠心病病人血清miR-34a、miR-145表达与冠状动脉病变程度的关系及相关机制研究

目的:探讨冠心病病人中miR-34a、miR-145表达与冠状动脉病变程度的关系及相关机制。方法:选取2018年3月—2019年5月本院收治的冠心病病人60例作为冠心病组,健康志愿者60名作为对照组。对冠状动脉造影检查结果进行Gensini评分,根据分值差异将冠状动脉狭窄程度分为轻度组(<50分,29例)、中度组(50～90分,19例)、重度组(>90分,12例)。记录1年内心血管不良事件发生情况,并分为心血管不良事件组(13例)和非心血管不良事件组(47例)。纳入本研究后,采集次日清晨受试者外周静脉血4 mL,分离血浆,逆转录聚合酶链式反应(RT-PCR)检测miR-34a、miR-145表达水平。常规培养人血管内皮细胞株,分为正常对照组、IL-6组、空载体转染组、miR-34a低表达组、miR-34a高表达组,检测沉默信息调节因子1(SIRT1)mRNA及蛋白表达水平。另将人血管内皮细胞株分为正常对照组、氧化低密度脂蛋白(ox-LDL)组、空载体转染组、miR-145低表达组、miR-145高表达组,检测胰岛素样生长因子1受体(IGF-1R)mRNA及蛋白表达水平。结果...     

龙胆苦苷通过调控miR-34c-5p/XBP1轴抑制作胃癌细胞HGC-27增殖、迁移和侵袭的分子机制研究

背景龙胆苦苷(gentiopicroside, GPS)属于环烯醚萜苷类单体化合物,可抑制肺癌和卵巢癌等肿瘤细胞的恶性行为,但其能否抑制胃癌细胞恶性行为还未知.本研究假设GPS能够通过调控微小RNA-34c-5p(microRNA-34c-5p,miR-34c-5p)/X盒结合蛋白1(X-boxbinding protein-1, XBP1)轴抑制胃癌细胞恶性行为.目的探讨GPS对胃癌细胞HGC-27增殖、迁移和侵袭的影响及可能机制.方法体外培养HGC-27细胞,分为对照组、不同剂量(6、30、150μg/mL)GPS组、miR-34c-5p组、miR-NC组、150μg/mL GPS+anti-miR-34c-5p组和150μg/mL GPS+anti-miR-NC组,细胞计数试剂盒-8(cellcounting kit-8,CCK-8)法检测细胞增殖,Transwell检测细胞迁移和侵袭,实时定量聚合酶链式反应(real-time quantitative polymerase chain reaction, RT-qPCR)检测细胞中miR-34c-5p表达,蛋白质印迹法检测细胞中XBP1蛋白表达.双荧光素酶报告基因实验验证miR-34c-5p和XBP1靶向调控关系.结果与对照组比较,不同剂量(6、30、150μg/mL)GPS组HGC-27细胞活性、迁移数和侵袭数及细胞中XBP1蛋白表达均降低(P 0.05),miR-34c-5p表达升高(P0.05). miR-34c-5p组HGC-27细胞活性、迁移数和侵袭数及细胞中XBP1蛋白表达均低于对照组和miR-NC组(P 0.05).miR-34c-5p靶向负调控XBP1.与150μg/mL GPS组或150μg/mL GPS+anti-miR-NC组比较, 150μg/mL GPS+anti-miR-34c-5p组HGC-27细胞活性、迁移数和侵袭数及细胞中XBP1蛋白表达均升高(P 0.05).结论龙胆苦苷可抑制胃癌细胞HGC-27增殖、迁移和侵袭,其作用机制可能调控miR-34c-5p/XBP1轴有关.     

miR-140靶向调控SOX2在结肠癌中的作用机制研究

目的 分析miR-140在结肠癌中的作用机制.方法 qRT-PCR检测miR-140在结肠癌细胞和组织中的表达;CCK8法、细胞划痕实验检测miR-140对结肠癌HT29细胞增殖和迁移的影响.TargetScan筛选miR-140的潜在靶基因并通过双荧光素酶报告基因试验进行验证;采用qRT-PCR和Western bl...     

miR-383靶向Notch1对结肠癌HCT116细胞增殖和迁移的影响

目的 分析miR-383和Notch1在结肠癌中的作用及机制.方法 选择2017年4月至2020年3月在河北北方学院附属第一医院经病理检查确诊为结肠癌的74例患者,收集其经手术切除的肿瘤组织及癌旁正常组织(距肿瘤边缘>3 cm).采用TargetScan预测miR-383的潜在靶基因,采用双荧光素酶报告基因实验、逆转录...     

Effect and mechanism of miR-34a on proliferation,apoptosis and invasion of laryngeal carcinoma cells

Objective: To discuss the effect and mechanism of miR-34 a on the proliferation, apoptosis and invasion of laryngeal carcinoma cells. Methods: The laryngeal squamous carcinoma Hep2 cells were transiently transfected with miR-34 a mimics and miR-34 a NC. The MTT, colony-forming assay, Hoechst staining and Annexin V-PI double staining flow cytometry were employed to detect the effect of miR-34 a on the viability and apoptosis of laryngeal squamous carcinoma Hep2 cells; Transwell assay to defect the effect of miR-34 a on the migration and invasion of laryngeal squamous carcinoma Hep2 cells; western blot and RTPCR assay to defect the effect of miR-34 a mimics on the expression of survivin and Ki-67 m RNA in laryngeal squamous carcinoma Hep2 cells. Results: Compared with miR-34 a NC group, the cell viability in miR-34 mimics group was significantly decreased(P0.01), the cell apoptosis rate was significantly increased(P0.01), the abilities of cell migration and invasion were significantly reduced(P0.01) and the expression of survivin and Ki-67 m RNA was significantly decreased(P0.01). Conclusions: The increased expression of miR-34 a can induce the apoptosis of Hep2 laryngeal carcinoma cells and inhibit the cell proliferation and invasion, which is related to the down-regulated expression of survivin and Ki-67.     

miR-93 suppresses proliferation and colony formation of human colon cancer stem cells

AIM:To identify differentially expressed microRNAs(miRNAs) in human colon cancer stem cells(SW1116csc) and study their function in SW1116csc proliferation.METHODS:SW1116csc were isolated from the humancolon cancer cell line,SW1116 and cultured in serumfree medium. A miRNA microarray was used to detect differential expression profiles of miRNAs in SW1116cscand SW1116 cells. Real-time quantitative polymer asechain reaction(PCR) was performed to verify the differential expression of candidate miRNAs obtained f...     

Mir-483 inhibits colon cancer cell proliferation and migration by targeting TRAF1

MicroRNAs are important regulators during human growth and development. Emerging evidence indicates that microRNAs play important roles in colorectal cancer. The aim of this study is to reveal the biological function and direct target gene of miR-483 in colorectal cancer. The biological function of miR-483 on the proliferation and migration of colon cancer cells was then examined by Edu assay and transwell assay, respectively. Our findings revealed that miR-483 mimic could significantly inhibit cell proliferation and migration. The target gene of miR-483 was predicted by target scan software and identified by a dual fluorescence reporter system which showed that TRAF1 was a direct target gene of miR-483 in SW480 cell line. These data suggest that miR-483 is a colorectal cancer suppressor which could inhibit cell proliferation and migration, possibly via targeting TRAF1. The miR-483 could be a potential treatment target for colorectal cancer.     

miR-21在大肠癌细胞迁移和侵袭中的作用及机制探讨

目的 探讨miR-21在大肠癌细胞迁移和侵袭中的作用及机制.方法 取大肠癌SW480细胞培养、传代,分为两组.观察组转染miR-21 mimics,对照组加入同浓度的miRNA mimics negative control.采用实时荧光定量PCR法检测细胞中miR-21的表达情况,采用Transwell小室检测细胞的迁移和侵袭能力,Western blot法检测上皮一间质转化(EMT)相关蛋白表达情况.结果 转染组miR-21的表达量、细胞的迁移和侵袭能力均明显高于对照组(P均＜0.05);细胞中紧密连接蛋白(ZO-1)和上皮钙黏蛋白(E-cad)的表达明显降低、神经钙黏蛋白(N-cad)和转录因子Slug的表达明显升高,第10号染色体同源缺失性磷酸酶-张力蛋白(PTEN)表达明显降低、而磷酸化蛋白激酶B(p-Akt)表达明显升高(P均＜0.05).结论 miR-21可促进人大肠癌细胞发生EMT发生细胞迁移和侵袭,其机制为下调PTEN蛋白表达、激活P13K/Akt,促进EMT.     

miR-874 Inhibits cell proliferation,migration and invasion through targeting aquaporin-3 in gastric cancer

Background

Aquaporin-3 (AQP3) is a water transporting protein which plays an oncogenic role in several malignant tumors. However, its regulatory mechanism remains elusive to date. In this study, we investigated the microRNA-mediated gene repression mechanism involved in AQP3's role.

Methods

The potential microRNAs targeting AQP3 were searched via bioinformatic methods and identified by luciferase reporter assays, microRNA RT–PCR and western blotting. The expression patterns of miR-874 and AQP3 in human gastric cancer (GC) specimens and cell lines were determined by microRNA RT-PCR and western blotting. 5-ethynyl-2′-deoxyuridine, cell migration and invasion assays and tumorigenicity in vivo were adopted to observe the effects of miR-874 depletion or ectopic miR-874 expression on GC cell phenotypes. Cell apoptosis was evaluated by FACS and TUNEL in vitro and in vivo respectively.

Results

miR-874 suppressed AQP3 expression by binding to the 3′UTR of AQP3 mRNA in GC cells. miR-874 was significantly down-regulated and reversely correlated with AQP3 protein levels in clinical samples. Analysis of the clinicopathological significance showed that miR-874 and AQP3 were closely correlated with GC characteristics. Functional analyses indicated that ectopic miR-874 expression suppressed the growth, migration, invasion and tumorigenicity of GC cells, whereas miR-874 knockdown promoted these phenotypes. Down-regulation of Bcl-2, MT1-MMP, MMP-2 and MMP-9 and upregulation of caspase-3 activity and Bax were involved in miR-874 inducing cell apoptosis, and inhibiting migration and invasion.

Conclusions

These results provide a mechanism by which AQP3 is upregulated, as well as highlight the importance of miR-874 in gastric cancer development and progression.     

尼美舒利抑制结肠癌LOVO细胞增殖及转移的机制

目的 研究选择性COX2抑制剂尼美舒利(Nimesulide)对结肠癌细胞株LOVO生长的影响以及其参与抑制肿瘤血管转移的可能机制.方法 采用四甲基偶氮唑蓝(MTT)比色法观察尼美舒利对结肠癌细胞增殖的抑制,电镜下观察尼美舒利作用后细胞的超微结构变化,ELISA法检测尼美舒利对上清液中血管内皮生长因子(VEGF)的影响.结果 MTT显示尼美舒利能抑制LOVO的增殖,呈剂量和浓度依赖性.0.2 mmol/L尼美舒利作用72 h后电镜观察可见典型的凋亡小体.尼美舒利作用后上清液中VEGF的含量呈剂量依赖性下调.结论 尼美舒利可抑制结肠癌细胞株LOVO的生长,促进其凋亡,还可下调细胞上清中的VEGF含量,推测其通过抑制VEGF释放,从而抑制肿瘤的生长及浸润转移.     

胰腺癌组织c-MET表达与循环miR-34a、miR-449水平的相关性

目的 探讨胰腺癌组织织间质表皮转化因子(c-MET)的表达与循环miR-34a、miR-449水平的相关性及其临床意义。方法 收集2015年3月至2017年3月间嘉兴医学院附属第二医院行手术治疗并经病理证实的41例胰腺癌患者的临床资料。通过免疫组织化学染色检测胰腺癌组织及其匹配的癌旁正常胰腺组c-MET表达,根据测定结果将患者分为c-MET阳性组与c-MET阴性组。采集患者手术前和手术后3个月外周血,应用荧光定量PCR法检测循环miR-34a和miR-449水平。分析癌组织c-MET表达与患者临床病理参数、预后及循环miR-34a、miR-449水平的关系。分析循环miR-34a和miR-449水平对胰腺癌TNM分期、淋巴结转移和预后的评估价值。结果 胰腺癌组织c-MET阳性率明显高于癌旁正常组织(63.4%比24.4%),差异有统计学意义(P<0.05)。与c-MET阴性患者比较,c-MET阳性患者TNMⅢ/Ⅳ期者居多(73.1%比33.4%),淋巴结转移率高(76.9%比46.7%),生存时间短(29.5个月比35.0个月),生存率低(38.5%比53.3%),差异均有统计学意义(P值均<0.05)。术前c-MET阳性患者循环miR-34a、miR-449水平明显低于c-MET阴性患者(0.228±0.068比0.524±0.106、0.252±0.063比0.432±0.094,P<0.05),术后c-MET阳性患者循环miR-449水平仍明显低于c-MET阴性患者(0.414±0.088比0.512±0.114,P<0.05),但两组间miR-34a水平的差异无统计学意义。术前循环miR-34a、miR-449水平对胰腺癌TNM分期、淋巴结转移及预后有预测价值(P<0.05)。结论 miR-34a、miR-449靶向结合胰腺癌组织c-MET,有可能成为潜在的胰腺癌标志物。     

中药抑制结肠癌细胞增殖、促进凋亡的分子机制

结肠癌(colon cancer)已为常见的恶性肿瘤之一,有转移者5年生存率仅有8%。我国传统的中医在治疗结肠癌中,彰显了增效减毒的优势,具有抗肿瘤作用。近年来,中药对结肠癌细胞系体外培养生长的抑制作用、增强机体免疫功能以及对细胞周期、细胞凋亡的影响等进行了有益的探索。本文就中药抑制结肠癌细胞增殖、促进凋亡的分子机制与研究进展作一综述。     

Tumor-suppressive miR-34a induces senescence-like growth arrest through modulation of the E2F pathway in human colon cancer cells

Accumulating evidence suggests a role for microRNAs in human carcinogenesis as novel types of tumor suppressors or oncogenes. However, their precise biological role remains largely elusive. In the present study, we aimed to identify microRNA species involved in the regulation of cell proliferation. Using quantitative RT-PCR analysis, we demonstrated that miR-34a was highly up-regulated in a human colon cancer cell line, HCT 116, treated with a DNA-damaging agent, adriamycin. Transient introduction of miR-34a into two human colon cancer cell lines, HCT 116 and RKO, caused complete suppression of cell proliferation and induced senescence-like phenotypes. Moreover, miR-34a also suppressed in vivo growth of HCT 116 and RKO cells in tumors in mice when complexed and administered with atelocollagen for drug delivery. Gene-expression microarray and immunoblot analyses revealed down-regulation of the E2F pathway by miR-34a introduction. Up-regulation of the p53 pathway was also observed. Furthermore, 9 of 25 human colon cancers (36%) showed decreased expression of miR-34a compared with counterpart normal tissues. Our results provide evidence that miR-34a functions as a potent suppressor of cell proliferation through modulation of the E2F signaling pathway. Abrogation of miR-34a function could contribute to aberrant cell proliferation, leading to colon cancer development.