MiR-148a inhibits angiogenesis by targeting ERBB3

MicroRNAs (miRNAs) play an important role in carcinogenesis in various solid cancers including breast can-cer. Down-regulation of microRNA-148a (miR-148a) has been reported in certain cancer types. However, the biological role of miR-148a and its related targets in breast cancer are unknown yet. In this study, we showed that the level of miR-148a was lower in MCF7 cells than that in MCF10A cells. V-erb-b2 erythroblastic leukemia viral oncogene homolog 3 (ERBB3) is a direct target of miR-148a in human breast...     

丹参素预防大鼠缺血再灌性心律失常的实验研究

采用离体心脏灌流及冠脉结扎方法，复制大鼠心肌缺血再灌注损伤的模型，观察丹参素对缺血及再灌性心律失常的保护作用。实验表明，离体灌注大鼠缺血期心律失常的发生率为８５．７％，主要为传导阻滞及室性早搏和室性心动过速，但无室性纤颤发生；再灌期心律失常发生率高达１００％，主要为室性早搏和室性心动过速，室性纤颤发生率为５７．１％。０．５μｍｏｌ／Ｌ异搏定和４ｍｇ／Ｌ丹参素均能使大鼠缺血再灌性心律失常发生率明显降低、持续时间缩短，但以丹参素的预防效果更佳。上述剂量的异搏定和丹参素，分别使缺血性心律失常发生率降低了３３．３％和５０．０％；再灌性心律失常发生率降低了７１．４％和８５．７％（Ｐ分别＜０．０５和０．００１）。可见丹参制剂具有预防缺血再灌性心律失常的作用     

MicroRNA-375 sensitizes tumour necrosis factor-alpha (TNF-α)-induced apoptosis in head and neck squamous cell carcinoma in vitro

We investigated the effect of microRNA-375 (miR-375) on tumour necrosis factor-alpha (TNF-α)-induced cell death in head and neck squamous cell carcinoma, and further explored the potential molecular mechanism underlying this phenomenon. Cal27 cells were transfected with miR-375 mimic and subsequently treated with or without TNF-α (10 ng/ml). An additional group of cells were treated with TNF-α alone. The resulting morphological changes were observed, and the percentage of sub-G1 cells was measured. The protein expression and cleavage of caspase 3, caspase 8, and poly(ADP ribose) polymerase (PARP) were determined through Western blotting. The results showed a significant increase in cell death in the combination group, but not in the groups treated with miR-375 mimic, TNF-α alone, or control. The data obtained from sub-G1 cells supported the notion that miR-375 increases the accumulation of sub-G1. In the combination group, the degradation of caspase 3, caspase 8, and PARP was observed and the cleavage of these enzymes was detected. The pan-caspase inhibitor, Z-VAD, inhibited the apoptosis of Cal27 cells treated with a combination of miR-375 mimic and TNF-α. In addition, the apoptosis inhibitory proteins, cFLIP-L and cIAP1, were down-regulated in a time-dependent manner. Taken together, these data suggest that miR-375 sensitizes TNF-α-induced apoptosis, and the reduction in the expression of the apoptosis inhibitory proteins cFLIP-L and cIAP2 plays an important role in this sensitization.     

Bone marrow mesenchymal stem cell-derived exosomal miR-34c-5p ameliorates RIF by inhibiting the core fucosylation of multiple proteins

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Overexpression of tissue microRNA10b may help predict glioma prognosis

We investigated the relationship between microRNA-10b (miR-10b) expression and prognosis in human glioma patients. Quantitative real-time polymerase chain reaction (qRT-PCR) analysis was used to characterize the expression patterns of miR-10b in 128 glioma and 20 normal brain tissues. Clinical information – age, sex, Karnofsky Performance Status (KPS) and World Health Organization (WHO) grade – were also collected. The associations between miR-10b expression and the clinicopathological factors and outcome of glioma patients were statistically analyzed. Expression levels of miR-10b in glioma tissue were significantly higher than in normal brain tissue (P < 0.001). High-grade glioma (WHO grade III and IV) had much higher miR-10b expression levels than low-grade tumors (WHO grade I and II). Additionally, the increased miR-10b expression in the glioma tissues was significantly associated with a low KPS (P = 0.03). Kaplan–Meier survival curves and Cox regression analyses showed that overexpression of miR-10b (P = 0.01) and high grade (P = 0.02) were independent factors predicting poor outcome for glioma patients. Furthermore, subgroup analyses showed that the miR-10b expression level was significantly associated with poor overall survival in glioma patients with high grades (P < 0.001). Up-regulation of miR-10b may have value in predicting clinical outcome in glioma patients, particularly for those with high pathological grades.     

miR-7靶向缺氧诱导因子1α对肝癌细胞的影响*

目的： 探究微小RNA-7（miR-7）靶向缺氧诱导因子1α（HIF-1α）对肝癌细胞迁移、凋亡及干细胞特性的影响。 方法： 采用慢病毒转染肝癌细胞MGCC97H,分为对照组、miR-7 模拟物组、miR-7 干扰组（ 转染miR-7 模拟物 组+ 干扰物）、HIF-1α 过表达组（ 转染pc-HIF1α）和共转染组（ 转染miR-7 模拟物+pc-HIF1α）,RT-PCR 检测各 组细胞miR-7、HIF-1α mRNA 表达量,免疫印迹检测各组HIF-1α 蛋白的表达量,Transwell 实验检测细胞迁移能 力,流式细胞法检测细胞凋亡情况,软琼脂克隆形成实验分析其干细胞特性,荧光素酶实验验证miR-7 与HIF-1α 靶向关系。结果： miR-7 模拟物组细胞HIF-1α 蛋白表达、迁移率、克隆形成率低于对照组,凋亡率高于对照组; HIF-1α 过表达组细胞迁移率、克隆形成率高于对照组,凋亡率低于对照组;共转染组HIF-1α 蛋白表达、细胞迁 移率、克隆形成率低于HIF-1α 过表达组,凋亡率高于HIF-1α 过表达组。结论： miR-7 靶向HIF-1α 可降低肝癌细 胞迁移能力及干细胞特性,促进细胞凋亡,miR-7 及HIF-1α 可能是肝癌的潜在治疗靶点。     

抑制miR-133b通过靶向FOXP3对PD大鼠调节性T淋巴细胞、炎性反应和神经元凋亡的影响

目的探究抑制微小RNA(microRNA,miR)-133b通过靶向叉头盒蛋白3(forkhead box protein 3,FOXP3)对帕金森病(Parkinson’s disease,PD)大鼠调节性T细胞(regulatory T cells,Treg)的影响。方法 32只PD模型大鼠随机分为PD组和PD+miR-133b antagomir组(n=16),健康大鼠16只作为对照组。尾静脉注射miR-133b antagomir(300μg)来抑制miR-133b的水平。检测和比较各组大鼠神经功能、黑质损伤、细胞凋亡、炎性反应、Treg细胞水平、miR-133b、FOXP3 mRNA和蛋白表达水平;通过双荧光素酶报告验证miR-133b和FOXP3的靶向关系。结果 PD组的逃避潜伏期、旋转速率、细胞凋亡情况、IL-6、miR-133b水平显著高于对照组,穿越次数、IL-10、FOXP3 mRNA和蛋白表达量显著低于对照组(P<0.05)。PD+miR-133b antagomir组的逃避潜伏期、旋转速率、细胞凋亡情况、IL-6、miR-133b水平显著低于PD组,穿越次...     

Circ_002664/miR-182–5p/Herpud1 pathway importantly contributes to OGD/R-induced neuronal cell apoptosis

ObjectiveApoptosis is a prominent form of neuron death in cerebral ischemia-reperfusion-induced injury. Accompanied with the pathogenesis, Circ_002664 is upregulated. However, its role in the neuron apoptosis and the underlying mechanisms are unknown.MethodsIn this study, HT22 cells were treated with oxygen glucose deprivation and reoxygenation (OGD/R). The cell viability, apoptosis, proliferation and mitochondrial potential were examined. The expressions of interested genes, Circ_002664, miR-182–5p and Herpud1, were measured. The roles of these genes in OGD/R-induced cell injury were investigated by knockdown, overexpression alone or in combination. Additionally, the interactions between Circ_002664, miR-182–5p and Herpud1 were validated by luciferase report assay. The levels of MAP2, CHOP, Cytochrome C (CYC) and cleaved caspase-3 were determined.ResultsOGD/R treatment significantly increased cell apoptosis, decreased cell proliferation and mitochondrial potential, as well as increased Circ_002664 and Herpud1 expressions, and decreased miR-182–5p level. Circ_002664 knockdown markedly inhibited the effects by OGD/R on cell survival and altered expression of miR-182–5p and Herpud1. MiR-182–5p was observed sponged by Circ_002664 and negatively mediated its effect above mentioned, and this was by directly targeting Herpud1. Additionally, it was observed that CHOP expressions were regulated by Circ_002664/miR-182–5p/Herpud1 pathway, and in turn mediated its regulation in CYC and cleaved caspase-3.ConclusionsIn summary, our data showed that the Circ_002664 importantly contributed to neuronal cell apoptosis induced by OGD/R treatment, and this might be achieved by directly targeting miR-182–5p/Herpud1 pathway.     

血清miRNA-182检测在结直肠癌中的诊断价值研究

目的探讨血清miRNA-182作为结直肠癌(CRC)潜在标志物的诊断价值。方法运用荧光定量PCR法检测53例CRC患者血清miRNA-182相对表达量,并与肠良性病变患者及健康体检者进行比较分析。结果 CRC患者血清miRNA-182相对表达量明显高于肠良性病变组及对照组,差异均有统计学意义(P0.05)。ROC曲线显示血清miRNA-182诊断CRC的曲线下面积为0.846,95%置信区间为0.768~0.925;诊断灵敏度为77.1%,特异度为81.1%。血清miRNA-182相对表达量与CRC患者TNM分期(P=0.011)及远距离转移(P=0.002)有关;而与其他临床特征无关。CRC患者术后血清miRNA-182相对表达量明显低于术前水平(P0.01);而术后出现复发/转移的患者血清miRNA-182相对表达量又明显升高(P=0.019)。结论 CRC患者血清miRNA-182相对表达量明显升高,并与病情及恶性进展密切相关,血清miRNA-182可作为CRC潜在标志物用于临床诊断及病情评估。     

MicroRNA155通过下调清道夫受体表达抑制巨噬细胞泡沫化形成

 探讨microRNA-155(miR-155)对巨噬细胞泡沫化过程的影响及机制。【方法】 实时定量PCR检测miR-155的表达,Western Blot方法检测巨噬细胞A类清道夫受体SR-A和B型清道夫受体CD36的表达,激光共聚焦显微镜观察miR-155对THP-1结合、摄取DiI标记氧化型低密度脂蛋白(DiI-oxLDL)能力的影响。【结果】 80μg/mL的氧化型低密度脂蛋白(ox-LDL)时间依赖性地诱导巨噬细胞miR-155表达上调。过表达miR-155抑制SR-A和CD36的表达,同时巨噬细胞结合、摄取DiI-oxLDL的能力明显降低。而反义-miR-155则明显上调SR-A和CD36的表达,同时巨噬细胞结合、摄取DiI-oxLDL的能力明显增强。【结论】 MiR-155通过降低巨噬细胞SR-A和CD36的表达抑制巨噬泡沫细胞的形成。