MicroRNA-181d-5p通过PTEN参与睾丸支持细胞间紧密连接损伤

目的:探讨miR-181d-5p通过与人第10号染色体缺失的磷酸酶和张力蛋白同源的基因(PTEN)mRNA 3'UTR区相互作用,参与小鼠睾丸支持细胞TM4细胞间紧密连接损伤及其可能机制.方法:通过网站预测miR-181d-5p的靶基因为PTEN mRNA,采用双荧光素酶报告基因分析实验在293T细胞上验证其与靶基因3...     

循环miRNA21在肝细胞癌早期诊断中的价值

目的 探讨血浆中miRNA21作为肝细胞癌早期生物标志物的诊断价值.方法采用定量RT-PCR（quantitative RT-PCR）检测55例肝细胞癌患者、60例慢性肝炎患者、50例健康对照者血浆中miRNA21的表达水平.结果 血浆miRNA21在肝细胞癌组中水平显著高于慢性乙肝组（P〈0.01）和健康对照组（P〈0.01）.通过绘制受试者工作曲线（receiver-operator characteristic curve,ROC curve）分析,miRNA21作为肝细胞癌和慢性乙肝的诊断标志物,其诊断价值分别为：灵敏度（65%）,特异度（85%）,受试者工作曲线下面积（AUC）为0.771,而miRNA21作为肝细胞癌和健康对照者的诊断标志物,其诊断价值分别为：灵敏度（89%）,特异度（95%）,AUC为0.956.结论 miRNA21是肝细胞癌潜在的早期诊断标志物.     

microRNA-128在胶质瘤中的表达及其临床意义

目的 研究人脑胶质瘤的microRNA-128(miR-128)表达水平及IDH1突变型、MGMT、Ki-67蛋白表达与胶质瘤病理分级、预后的关系.方法 收集脑胶质瘤手术标本21例,其中病理分级低级别者13例、高级别者8例;脑外伤清除组织6例.采用实时定量PCR法检测胶质瘤标本及胶质瘤细胞株U87、人小胶质细胞株HMC...     

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.     

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...     

Xiaoxianggou attenuates atherosclerotic plaque formation in endogenous high Ang II ApoE−/− mice via the inhibition of miR-203 on the expression of Ets-2 in endothelial cells

BackgroundAtherosclerosis is a chronic immune-inflammatory disorder and one of the leading causes responsible for cardiovascular morbidity and mortality. Traditional Chinese medicine treatment with multi-targets has shown prospects for the therapeutic effect on atherosclerosis. Thus, this study aims to investigate whether xiaoxianggou has benefit for reducing the atherosclerotic plaque area in endogenous high Ang II ApoE^−/− mice and investigated the underlying mechanisms.MethodsEndogenous high Ang II ApoE^−/− mice model was generated by using two kidney one clip (2K1C). All mice were treated by intragastric administration with xiaoxianggou two times a week for 16 weeks. En face plaque area was analyzed by oil-red O staining. Serum anti-OxLDL antibodies were measured by ELISA assay. Expression of miR-203 and Ets-2 were evaluated using qRT-RCR and western blotting analysis, respectively.ResultsThis study revealed that xiaoxianggou treatment dose-dependently reduced the atherosclerotic plaque area and serum autoantibodies against oxLDL, elevated miR-203 expression and reduced Ets-2 expression in endogenous high Ang II ApoE^−/− mice. In primary arterial ECs, Xiaoxianggou reverses the reduced miR-203 expression and the elevated Ets-2 expression induced by AngII, which was further recovered by miR-203 inhibitor. Additionally, miR-203 regulated the expression of Ets-2 by targeting Ets-2-3′ UTR. Moreover, miR-203 inhibitor reversed the reduction of atherosclerotic lesion area induced by Xiaoxianggou.ConclusionsThese findings present that xiaoxianggou plays an anti-atherosclerotic role in endogenous high Ang II ApoE^−/− mice model, which is partly due to its antioxidant actions against atherosclerosis and the inhibition of miR-203 on the expression of Ets-2 in endothelial cells.     

三氧化二砷联合维生素C抑制耐药性肺腺癌 裸鼠移植瘤生长机制的研究

目的:探索三氧化二砷(As2O3)联合维生素C(Vit C)对人耐药性肺腺癌裸鼠移植瘤抑制作用及其可能机制。方法:建立裸鼠人耐药性肺腺癌移植瘤模型,随机分为空白对照组,维生素C组(Vit C,250 mg.kg-1),As2O31组(1.5 mg.kg-1),As2 O3 2组(As2 O3 3 mg.kg-1),As2 O3联合Vit C组(As2 O3,1.5 mg.kg-1+VitC 250 mg.kg-1),ip 2周,观察并记录各组裸鼠移植瘤的生长情况及肿瘤体积和裸鼠体重的变化,计算肿瘤生长抑制率,用药2周后,取瘤组织进行病理学检查。用逆转录聚合酶链反应(RT-PCR)和蛋白印迹法(Western blot)检测移植瘤内生存素(Survivin)与血管内皮生长因子(VEGF)的表达情况。结果:Vit C组,As2O3 1,2组,As2O3联合Vit C组的抑瘤率分别为:3.42%,42.3%,66.25%,79.93%。与对照组相比,As2 O3各组和As2 O3+Vit C组治疗后肿瘤体积减少,瘤质量减轻,差异均有显著性(P<0.O1);与As2 O3单独用药组比较,As2 O3+Vit C联合用药组肿瘤体积,瘤质量明显减少(P<0.O1),抑瘤率明显增高;而Vit C组治疗后肿瘤体积及瘤质量没有明显减少。病理检查显示各As2O3组、As2O3+Vit C组治疗后可见肿瘤坏死增多。RT-PCR及Western,blot结果显示:联合组与As2O3组、Vit C组比较Survivin、VEGF条带强度显著减小。结论:As2O3与Vit C联合用药比As2O3单独应用抑制耐药性肺癌移植瘤生长的作用更强,二者具有协同抗肿瘤作用,其作用机制可能与下调Survivin及VEGF的表达有关。两者联用有望成为低毒高效的化疗组合。