miR-137 通过靶向Wnt5a 调控宫颈癌细胞的增殖、迁移及侵袭

[摘要] 目的: 探讨miR-137 在宫颈癌组织和细胞中的表达及其对宫颈癌细胞增殖、迁移及侵袭的作用及其机制。方法: 选用2017 年1 月至2018 年3 月东莞市人民医院妇产科32 例手术切除的宫颈癌组织及对应的癌旁组织标本,以及宫颈癌细胞系C33A、HeLa、SiHa 及宫颈上皮永生化细胞株H8,用RT-PCR 法检测宫颈癌组织和细胞系中miR-137 的表达水平。将miR-137mimics、miR-137 NC质粒转染到C33A和HeLa 细胞,用CCK-8 法、Transwell 迁移及侵袭实验观察上调miR-137 表达对C33A和HeLa 细胞增殖、迁移和侵袭能力的影响。用荧光素酶报告基因及WB实验检测miR-137 和Wnt5a 在宫颈癌中的靶向调控关系。构建Wnt5a 过表达载体,观察同时过表达Wnt5a 和miR-137 对宫颈癌细胞系C33A和HeLa增殖、迁移和侵袭的影响。结果: 在宫颈癌组织和细胞系中miR-137 表达水平明显低于癌旁组织和H8 细胞（均P<0.05）。上调miR-137 表达能够显著抑制C33A和HeLa 细胞的增殖、迁移和侵袭能力（均P<0.05）。萤光素酶报告基因实验确定Wnt5a 与miR-137 的靶向关系。过表达Wnt5a 后,可以在一定程度上逆转miR-137 对宫颈癌细胞系C33A和HeLa 的增殖、迁移和侵袭能力。结论: miR-137 通过靶向Wnt5a 抑制宫颈癌细胞的增殖、迁移、侵袭,其可能是宫颈癌治疗的潜在靶点。     

microRNA-21对肺癌A549细胞增殖和Smad7表达的影响

目的 探讨微小RNA-21 ( miR-21 )对肺癌A549细胞中Smad7表达的调控和对肺癌A549 细胞增殖的影响. 方法 常规培养肺癌细胞系A549,经脂质体转染miR-21模拟物和抑制物及阴性对照片段48 h后,采用Western blot、qRT-PCR法检测 Smad7 基因及蛋白的表达水平, MTT 法检测A549细胞增殖情况. 结果 转染miR-21 模拟物后Smad7的mRNA和蛋白表达量降低( P<0. 05 ) ,而转染miR-21 抑制物后Smad7的mRNA和蛋白表达量升高( P<0. 05 );MTT结果显示转染 miR-21 模拟物后细胞的增殖能力明显增强(P<0. 05),而转染miR-21 抑制物后细胞增殖能力明显减弱( P<0. 05 ). 结论 通过下调 miR-21 可提高 Smad7 的mRNA和蛋白表达,进而抑制A549细胞的增殖.     

miR-17在胃癌中的表达及临床意义

目的：探讨miR-17在胃癌中的表达及其与临床病理特征的关系。方法提取30例胃癌及癌旁正常胃黏膜组织标本的总RNA,采用茎环逆转录实时定量聚合酶链反应（ RT-PCR）方法检测miR-17的表达量,并分析其与分化程度、淋巴结转移、胃癌pTNM分期等临床病理特征的关系。结果与癌旁正常胃黏膜组织比较,miR-17在癌组织中高表达（胃癌及癌组织中表达值分别为12.7779±0.9067和10.3079±0.4446,P＜0.05）,其中miR-17的表达与肿瘤的大小、胃癌的pTNM分期及Lauren分型相关（P＜0.05）和患者的性别、年龄、有无淋巴结转移及组织分化程度无关（P＞0.05）。结论 miR-17在胃癌中的高表达可能对胃癌的发生发展起重要作用,为胃癌靶向治疗提供依据。     

Platelet-derived extracellular vesicles encapsulate microRNA-34c-5p to ameliorate inflammatory response of coronary artery endothelial cells via PODXL-mediated P38 MAPK signaling pathway

Background and aimsLow-grade chronic inflammation was reported to serve as a distinctive pathophysiologic feature of coronary artery disease (CAD), the leading cause of death around the world. Herein, the current study aimed to explore whether and how microRNA-34c-5p (miR-34c-5p), a miRNA enriched in extracellular vesicles (EVs) originated from the activated platelet (PLT-EVs), affects the inflammation of human coronary artery endothelial cells (HCAECs).Methods and resultsHCAECs were established as an in vitro cell model using oxidized low-density lipoprotein (ox-LDL). miR-34c-5p, an abundant miRNA in PLT-EVs, can be transferred to HCAECs and target PODXL by binding to its 3′UTR. Gain- and loss-of-function experiments of miR-34c-5p and podocalyxin (PODXL) were performed in ox-LDL-induced HCAECs. Subsequently, HCAECs were subjected to co-culture with PLT-EVs, followed by detection of the expression patterns of key pro-inflammatory factors. Either miR-34c-5p mimic or PLT-EVs harboring miR-34c-5p attenuated the ox-LDL-evoked inflammation in HCAECs by suppressing interleukin-1β (IL-1β), IL-6 and tumor necrosis factor-α (TNF-α). By blocking the P38 MAPK signaling pathway, miR-34c-5p-mediated depletion of PODXL contributed to protection against ox-LDL-induced inflammation. In vitro findings were further validated by findings observed in ApoE knock-out mice. Additionally, miR-34c-5p in PLT-EVs showed an athero-protective role in the murine model.ConclusionAltogether, our findings highlighted that miR-34c-5p in PLT-EVs could alleviate inflammation response in HCAECs by targeting PODXL and inactivation of the P38 MAPK signaling pathway.     

血清miR-21在疱疹性咽峡炎患儿中的表达及临床意义

目的 探讨疱疹性咽峡炎患儿血清微小RNA-21(miR-21)表达,并分析其与辅助性T淋巴细胞17(Th17)/调节性T淋巴细胞(Treg)、转化生长因子-β1(TGF-β1)、白细胞介素(IL)-17、IL-6、IL-2和IL-10的关系.方法 选取2018年11月至2020年4月在该院就诊的68例疱疹性咽峡炎患儿作...     

重复经颅磁刺激对阿尔茨海默病患者临床症状及血浆微小核糖核酸-125b、血浆磷酸化Tau-181蛋白的影响

目的：观察重复经颅磁刺激(repetitive transcranial magnetic stimulation,rTMS)对阿尔茨海默病(Alzheimer’s disease,AD)患者认知功能、神经精神行为症状及血浆微小核糖核酸-125b(microRNA-125b,miR-125b)、血浆磷酸化Tau-181蛋白（phosphorylated Tau181 protein,P-tau181）表达的影响。方法：筛选轻中度AD患者34例,随机分为对照组（n=16）和试验组（n=18）。对照组采取认知训练及重复经颅磁伪刺激,试验组采取认知训练结合重复经颅磁真刺激。磁刺激强度为100%的静息运动阈值,频率为10Hz,每日治疗1次,每周治疗5天,持续4周,刺激脑区为左侧前额叶背外侧区和左侧颞叶区。在治疗前、后进行Addenbrooke-Ⅲ认知检查（the AddenbrookeⅢcognitive examination,ACE-Ⅲ）、简易精神状态量表（mini-mental state scale,MMSE）及神经精神症状问卷（neuropsychiatric inventory,N...     

MicroRNA-194 acts as a prognostic marker and inhibits proliferation in hepatocellular carcinoma by targeting MAP4K4

MicroRNAs (miRNAs) play a crucial role in cancer development and progression of hepatocellular carcinoma (HCC). In this study, we aimed to analyze the role of microRNA-194 (miR-194) in HCC. We found that miR-194 expression was significantly reduced in HCC and its expression was an independent poor prognostic factor for HCC patient overall and disease-free survival rate. A significant correlation was observed between miR-194 reduction and unfavourable variables including tumor size (P = 0.0315), histologic grade (P = 0.0038), TNM stage (P = 0.0083), intrahepatic metastasis (P = 0.0184). Overexpression of miR-194 in HCC cell lines HepG2 and Hep3B inhibited cell proliferation by blocking G1-S transition and inducing apoptosis. Mitogen-activated protein kinase 4 (MAP4K4), a potential target gene of miR-194, was inversely correlated with miR-194 expression in HCC tissues and cell lines. Further studies demonstrated that miR-194 regulated the progression of HCC through directly inhibiting the expression of MAP4K4 and the restoration of MAP4K4 expression reversed the inhibitory effects of miR-194 on HCC cell proliferation. Together, our findings indicate that miR-194 may serve as a valuable prognostic marker and promising interventional therapeutic target for HCC.     

microRNA-27a对树突状细胞表型及功能的影响

目的:研究microRNA-27a(miR-27a)对脂多糖(Lipopolysaccharide,LPS)刺激的小鼠树突状细胞(Dendritic cell,DC)的成熟和细胞因子分泌的影响。方法:小鼠骨髓来源的未成熟树突状细胞(immature dendritic cell,im DC)转染miR-27a的模拟物(miR-27a mimics)后,用LPS刺激24 h,采用流式细胞仪检测其表面共刺激分子CD80、CD86及MHCⅡ表达,ELISA方法检测其上清中的IL-12p70及IL-10蛋白水平,RT-PCR方法检测其细胞内IL-12p40及IL-10 mRNA水平,混合淋巴细胞反应(MLR)检测其刺激T细胞增殖能力。结果:与未处理的im DC比较,LPS刺激24 h后的DC表面的共刺激分子CD80、CD86及MHCⅡ表达均显著增高(均P0.001);LPS刺激24 h后,与对照组比较,转染miR-27a mimics细胞的共刺激分子CD80、CD86及MHCⅡ表达均显著降低(均P0.001),且显著抑制IL-12分泌(P0.01)、促进IL-10分泌(P0.05),并显著减弱LPS刺激的DC促CD4+T细胞增殖的能力(P0.01)。结论:miR-27a影响小鼠树突状细胞的成熟以及细胞因子的分泌。