miR-542-5p对卵巢癌细胞SKOV3恶性生物学行为的影响

目的:探讨miR-542-5p对卵巢癌细胞系SKOV3的增殖、迁移、侵袭、凋亡等恶性生物学行为的影响。方法:应用miR-542-5p mimics和mimics阴性对照 (mimics NC)分别转染卵巢癌细胞SKOV3。采用MTT实验、划痕试验、Transwell实验和流式细胞术检测过表达miR-542-5p对SKOV3细胞增殖、迁移、侵袭、凋亡的影响。结果:过表达miR-542-5p后,SKOV3细胞的增殖能力较阴性对照和正常SKOV3细胞明显降低（P<0.05）;Transwell实验和划痕实验显示,过表达miR-542-5p后,细胞的迁移和侵袭能力较阴性对照组明显下降（P<0.05）;流式细胞术结果显示,过表达miR-542-5p后,SKOV3细胞的凋亡率较阴性对照组升高,而对细胞周期无影响。结论:过表达miR-542-5p可以抑制卵巢癌细胞SKOV3的体外增殖、迁移和侵袭能力,诱导细胞凋亡。提示miR-542-5p在卵巢癌恶性生物学进程中可能发挥重要作用。     

肾透明细胞癌中miR-200c负性调控ZEB2基因表达的机制研究

目的:探讨肾透明细胞癌中miR-200c调控ZEB2基因表达的分子机制。方法:实时定量PCR法检测肾透明细胞癌及癌旁组织中miR-200c及ZEB2基因的表达水平。培养肾透明细胞癌Caki-1细胞,将miR-200c的前体转染Caki-1细胞,Western blot法检测ZEB2蛋白的表达改变,荧光素酶报告基因表达分析实验验证miR-200c与ZEB2基因的3' 非翻译区(3' UTR)的结合及调控作用。结果:实时定量PCR表达检测显示,与癌旁组织相比,miR-200c在肾透明细胞癌组织中的表达显著下调,而ZEB2 mRNA在肾透明细胞癌组织中的表达则呈现明显上调。Pearson相关性分析结果表明,在肾透明细胞癌及癌旁组织中miR-200c与ZEB2基因的表达均显示负性相关。荧光素酶报告基因表达分析实验明确miR-200c能够与ZEB2基因的3' UTR特异性地结合,并抑制荧光素酶的表达。miR-200c前体能够显著下调Caki-1细胞中ZEB2蛋白的表达。结论:miR-200c与ZEB2基因的表达异常与肾透明细胞癌相关,在肾透明细胞癌细胞中miR-200c能够负性调节其靶基因ZEB2的表达。     

非小细胞肺癌中miR-19a和miR-19b的表达及临床意义

目的:分析miR-19a、miR-19b在非小细胞肺癌中的表达及其与临床病理特征的关系。方法:非小细胞肺癌手术标本61例及其癌旁正常组织,提取总RNA,采用实时定量PCR方法检测miR-19a、miR-19b在非小细胞肺癌及其癌旁正常组织中的表达,并分析其与临床病理特征的关系。结果:miR-19a、miR-19b在非小细胞肺癌组织中的表达高于对应的癌旁正常肺组织,其表达与临床分期、病理类型及淋巴结有无转移相关（P<0.05）。而在不同年龄、性别和吸烟史患者间差异无统计学意义（P>0.05）。结论:miR-19a、miR-19b高表达与非小细胞肺癌的临床分期、病理分型及有无淋巴结转移密切相关,miR-19a、miR-19b有可能成为非小细胞肺癌的重要肿瘤标志物之一。     

Increased risk of polycystic ovary syndrome (PCOS) associated with CC genotype of miR-146a gene variation

Polycystic ovary syndrome (PCOS) is an endocrinopathy in reproductive-age women believed to be affected by several genetics and environmental factors or both. Different miRNAs are one of such genetic factors that their associations with PCOS have been implicated. For instance, miR-146a that is well known for strongly regulating the immune response and inflammation was upregulated in serum plasma, follicular fluid and granulosa cells of PCOS patients. Different studies have shown that genetic changes in pre-miRNA can cause change in the expression or biological function of mature miRNA. Therefore, the main aim of this study was to investigate the association of miR-146a gene variation (rs2910164) with the susceptibility to PCOS. This study consists of 180 patients with PCOS and 192 healthy women matched by age and geographical region. Genotyping were determined by using PCR-RFLP in all subjects. The genotype frequency and allele distributions of all subjects were evaluated using Fisher’s exact test directed by SPSS v.20. The genotype and allele frequencies of the miR-146a polymorphism (rs2910164) significantly differ between PCOS and healthy controls. The frequencies of CC genotype (p?=?.054) and ‘C’ allele (p?=?.0001) of the miR-146a variant indicated a significant incidence in cases compared to controls. Such association was obtained in co-dominant (OR?=?3.16) and dominant (OR?=?2.29) models. Result of this study can be proposed that women with miR-146a variation are at a higher risk for developing PCOS, which can be due to up-regulation of miR-146a.     

MicroRNA-150对上皮性卵巢癌细胞增殖、凋亡和侵袭转移能力的影响

目的 研究microRNA-150(miR-150)在人上皮性卵巢癌细胞中的表达情况,及其对人上皮性卵巢癌细胞增殖、凋亡和侵袭转移能力的影响。方法 通过荧光实时定量PCR(qRT-PCR)检测各处理组细胞中的miR-150表达水平;利用MTT法、流式细胞技术、Transwell法探究miR-150的表达对上皮性卵巢癌细胞增殖、凋亡及侵袭转移能力的影响。结果 与正常卵巢上皮细胞(T29)相比,上皮性卵巢癌细胞(A2780和OVCAR3)中miR-150表达显著降低(P＜0.01);转染miR-150mimic后,A2780和OVCAR3细胞中miR-150水平明显升高(P＜0.01);MTT试验显示,转染培养三天后,miR-150 mimic组细胞OD值(A2780:1.12±0.03;OVCAR3:1.91±0.03)较Blank组(A2780:2.35±0.09;OVCAR3:2.63±0.07)及miR-150 NC组(A2780:2.18±0.07;OVCAR3:2.43±0.11)明显降低(P＜0.01);细胞凋亡检测显示:miR-150 mimic组凋亡率(A2780:16.10±0.58%;OVCAR3:15.16±1.30%)较Blank组(A2780:10.07±0.66%;OVCAR3:3.81±0.24%)及miR-150 NC组(A2780:10.36±1.08%;OVCAR3:4.89±0.07%)明显升高(P＜0.01);Transwell试验显示:miR-150 mimic组穿膜细胞数(A2780:38.67±2.03;OVCAR3:28.67±2.03)较Blank组(A2780:76.30±7.45;OVCAR3:55.67±3.18)及miR-150 NC组(A2780:74.33±5.78;OVCAR3:56.33±3.84)明显减少(P＜0.01)。结论 miR-150在上皮性卵巢癌细胞中表达降低,可能是上皮性卵巢癌增殖、侵袭转移的机制之一;上调miR-150的表达可以抑制上皮性卵巢癌细胞增殖、促进细胞凋亡,并且降低上皮性卵巢癌细胞侵袭转移能力。     

黑树莓花青素靶向调控miR-338-5p/SIRT1相关信号通路对结直肠癌的化学预防作用

目的研究miR-338-5p/SIRT1相关信号通路在黑树莓花青素化学预防结直肠癌中的作用。方法小鼠分为健康对照组,氧化偶氮甲烷(AOM)/葡聚糖硫酸钠(DSS)诱导的炎症相关性结直肠癌小鼠模型组,AOM/DSS诱导联合黑树莓花青素处理组。利用miRNA基因芯片筛选差异表达miRNAs,选定miR-338-5p,采用RT-q PCR确认miR-338-5p在小鼠结肠组织及在人结直肠癌细胞株Caco-2、Lo Vo、HCT-116、HT29、SW480中的mRNA表达,生物信息学软件预测miR-338-5p和SIRT1靶向调节关系。Western blotting检测小鼠结肠组织中SIRT1蛋白及其下游mTOR等信号通路相关蛋白表达。结果miRNA基因芯片分析发现,与常规饮食的模型小鼠相比,喂食添加黑树莓花青素的模型小鼠结直肠肿瘤组织中miR-338-5p表达量显著减少,进一步研究几种结肠癌细胞系,确认了miR-338-5p表达趋势;黑树莓花青素处理结直肠癌细胞,miR-338-5p的表达能够显著降低。生物信息学预测miR-338-5p和SIRT1存在靶向调节关系。机制研究发现黑树莓花青素可以促进肠上皮细胞SIRT1蛋白的表达,并对其下游m TOR等相关信号通路分子蛋白水平具有调控作用。结论黑树莓花青素可能通过靶向调控miR-338-5p/SIRT1相关信号通路而发挥对结直肠癌的化学预防作用,进而为结直肠癌提供新的化学预防策略。     

茶多酚调节STAT3/miR-126/端粒信号通路活性延缓高糖诱导的人肾小球系膜细胞衰老

探讨茶多酚(tea polyphenols,TP)在体外高糖环境下延缓人肾小球系膜细胞(human glomerular mesangial cells,HGMCs)衰老的作用及可能的机制。在体外培养HGMCs,分为正常组(normal group,N,5.5 mmol·L^-1葡萄糖)、甘露醇组(mannitol group,MNT,5.5 mmol·L^-1葡萄糖+24.5 mmol·L^-1甘露醇)、高糖组(high dose of D-glucose group,HG,30 mmol·L^-1葡萄糖)、低剂量TP组(low dose of TP group,L-TP,30 mmol·L^-1葡萄糖+5 mg·L^-1 TP)及高剂量TP组(high dose of TP group,H-TP,30 mmol·L^-1葡萄糖+20 mg·L^-1 TP),分别在37℃,5%CO2条件下培养,干预72 h后,首先观察TP对HGMCs形态的影响;其次,检测细胞周期、衰老相关半乳糖苷酶(senescence-associated-β-galactosidase,SA-β-gal)染色阳性率、端粒长度;最后,检测p53-p21-Rb信号通路中关键信号分子p53,p21,Rb的蛋白表达水平及p-STAT3,miR-126的表达水平。结果表明,高糖能诱导HGMCs衰老,不仅表现为细胞周期阻滞于G1期、SA-β-gal染色阳性率升高、端粒长度缩短,还表现为p53,p21,Rb蛋白表达水平升高和p53-p21-Rb信号通路激活。L-TP能延缓HGMCs衰老,不仅表现为HGMCs细胞周期G1期阻滞的改善、SA-β-gal染色阳性率的下降、端粒长度的延长,还表现为p53,p21,Rb蛋白表达水平的下降,端粒-p53-p21-Rb信号通路活性的抑制。此外,高糖诱导HGMCs p-STAT3表达水平上调、miR-126表达水平下调,而L-TP可使这些变化得到改善。总之,高糖能激活端粒-p53-p21-Rb信号通路而诱导HGMCs衰老;L-TP能调节STAT3/miR-126表达水平,抑制端粒-p53-p21-Rb信号通路活性而延缓高糖诱导的HGMCs衰老。这些发现为临床上防治糖尿病肾病相关的肾脏细胞衰老提供了有效的干预措施。     

miR-21、miR-125b与舌鳞状细胞癌患者预后生存的关系

目的 研究miR-21、miR-125b与舌鳞状细胞癌患者预后生存的关系.方法 选取86例舌鳞状细胞癌患者手术切除的癌组织与对应的癌旁正常组织,分别测定其组织中miR-21、miR-125b表达量.患者随访半年,分析miR-21、miR125b表达与患者预后生存的关系.结果 舌鳞状细胞癌组织中miR-21、miR125...     

Hsa_circ_0074491 regulates the malignance of cholesteatoma keratinocytes by modulating the PI3K/Akt pathway by binding to miR-22-3p and miR-125a-5p: An observational study

Cholesteatoma is a benign cystic lesion that can continue to grow like a tumor. Circular ribonucleic acid (RNA) hsa_circ_0074491 (circ_0074491) has been reported to be down-regulated in cholesteatoma tissues. However, the role and regulatory mechanism of circ_0074491 in the growth of cholesteatoma are unclear.The expression of circ_0074491, microRNA (miR)-22-3p, and miR-125a-5p in cholesteatoma tissues was detected by quantitative real-time polymerase chain reaction. The proliferation, cell cycle, apoptosis, migration, and invasion of cholesteatoma keratinocytes were evaluated by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide, plate clone, flow cytometry, or transwell assays. Several protein levels were examined by western blotting. The targeting relationship between miR-22-3p or miR-125a-5p and circ_0074491 was verified via dual-luciferase reporter and RNA pull-down assays.We observed the downregulation of circ_0074491 in cholesteatoma tissues. Furthermore, circ_0074491 knockdown facilitated cell proliferation, migration, invasion, and repressed cell apoptosis in cholesteatoma keratinocytes. Circ_0074491 was verified as a decoy for miR-22-3p and miR-125a-5p in cholesteatoma keratinocytes. Both miR-22-3p and miR-125a-5p silencing reversed the impacts of circ_0074491 silencing on proliferation, apoptosis, migration, and invasion of cholesteatoma keratinocytes. Also, circ_0074491 knockdown activated the PI3K/Akt pathway in cholesteatoma keratinocytes via miR-22-3p and miR-125a-5p.Circ_0074491 played a suppressive role in cholesteatoma through inactivating the PI3K/Akt pathway via binding to miR-22-3p and miR-125a-5p, which provided a novel evidence for the involvement of circRNA in the development of cholesteatoma.     

miR-146在湿性ARMD中抑制IL-6表达的研究

目的:探讨miR-146表达与眼球衰老的相关性,以及年龄相关性黄斑变性(age-related macular degeneration,ARMD)发生过程中miR-146与炎症因子表达的相关性及其可能的机制.方法:分离鼠龄为2~24mo的小鼠RPE,采用qRT-PCR的方法检测RPE中miR-146 a/b和IL-6 mRNA的表达水平.检测来自于ARMD患者眼球中miR-146 a及IL-6 mRNA的表达水平.在ARPE-19细胞系中检测miR-146 a过表达对IL-6基因表达水平的影响.结果:miR-146的表达在自然衰老的小鼠RPE中与年龄呈现正相关,而IL-6无变化.在ARMD患者中,miR-146 a mRNA表达水平下降,IL-6 mRNA表达水平上升.在人ARPE-19细胞中的实验表明,miR-146 a过表达抑制了由TNF-α所诱导的IL-6的表达.结论:在湿性ARMD中,miR-146a与IL-6 mRNA表达水平有可能与ARMD的发生呈相关性,暗示IL-6和miR46 a有可能作为生物分子标志物在未来的ARMD诊断中发挥作用.