长链非编码RNA X染色体失活特异转录物调控微小RNA-335对胃癌的增殖和迁移的影响

目的探讨长链非编码RNA(lncRNA)X染色体失活特异转录物(XIST)对胃癌细胞增殖、迁移的影响及其作用机制。方法收集2018年1月至2019年12月来自宜昌市中心人民医院的胃癌患者42例,采用定量聚合酶链反应(qPCR)检测XIST在胃癌患者肿瘤组织和癌旁正常组织中表达,分析XIST表达与患者临床病理参数的相关性。采用qPCR检测XIST在胃癌细胞系中的表达,通过转染小干扰RNA(si-XIST)敲低XIST在胃癌细胞SGC-7901和AGS中的表达,分别将胃癌细胞分为si-XIST组和si-NC组,细胞计数试剂盒(CCK-8)检测各组细胞的增殖活性,细胞划痕实验和Transwell法检测细胞迁移和侵袭能力,双荧光素酶验证XIST与微小RNA(miR)-335的靶向关系。组间比较采用t检验。结果XIST在胃癌组织中相对表达量为1.86±0.24,显著高于癌旁正常组织的0.98±0.11,差异有统计学意义(P<0.05),同样,胃癌细胞系中XIST的相对表达显著上调(P<0.05),差异有统计学意义。组织样本中XIST的表达与患者的TNM分期和淋巴结转移明显相关(P<0.05),差异有统计学意义,敲低XIST表达可显著降低胃癌细胞的增殖、迁移和侵袭能力,XIST可负向调控miR-335的表达。结论lncRNA XIST可负向调控miR-335的表达,从而抑制胃癌的增殖、迁移和侵袭能力。     

miR-145 inhibits invasion of bladder cancer cells by targeting PAK1

ObjectivesMicroRNAs play important roles in cancer. In many cancers, miR-145 acts as a tumor suppressor, and it is down-regulated in bladder cancer. In the present study, we explored the modulation of oncogenic gene PAK1 by miR-145 in bladder cancer.Material and methodsExpression of miR-145 was detected in bladder cancer tissues and cell lines by quantitative real-time polymerase chain reaction. Through the bioinformatics approach, PAK1 has been predicted to be a direct target of miR-145 and was confirmed by the PAK1 messenger RNA 3′-untranslated region luciferase activity assay. To investigate whether miR-145 regulates PAK1 expression, it was overexpressed in J82 and T24 bladder cancer cells. In 10 paired bladder normal and tumor tissues, we determined the relationship between miR-145 and PAK1 through quantitative real-time polymerase chain reaction and western blot. By using transwell invasion assay and western blotting analysis, we investigated the effects of miR-145 and PAK1 on bladder cancer cell invasion and expression of invasion marker genes.ResultsThe level of miR-145 decreases and PAK1 protein expression up-regulates in bladder cancer tissue, as compared with the paired normal bladder tissue. Moreover, miR-145 directly targets PAK1 in bladder cancer cells. The level of miR-145 negatively correlates with PAK1 protein expression in bladder cancer. In addition, PAK1 promotes invasion and enhances the expression and activity of MMP-9, whereas miR-145 inhibits bladder cancer cell invasion and expressions of PAK1 and MMP-9.ConclusionsOur results indicate that miR-145 inhibits bladder cancer cell invasion, at least partly through targeting PAK1. Restoration or replacement of miR-145 could be an efficient approach to inhibit PAK1 and bladder cancer development in the tumor therapy.     

miR-362-3p的表达及其靶基因与胆囊癌恶性特征的关系

目的:探讨miR-362-3p在胆囊癌中的表达及功能。方法:用qRT-PCR检测手术切除的44例胆囊癌患者手术标本中miR-362-3p的表达,并分析其表达与胆囊癌临床病理特征及预后的关系。miR-362-3p模拟物转染胆囊癌细胞后,分别用MTT法、细胞划痕试验及Transwell侵袭试验观察细胞增殖、迁移及侵袭的改变。通过生物信息学方法及双荧光素酶报告基因试验分析miR-362-3p的靶基因,并采用补救试验验证。结果:miR-362-3p在胆囊癌组织的表达明显低于相应癌旁组织(P0.05)。miR-362-3p的低表达与肿瘤TNM分期、淋巴结转移及远处转移明显有关(均P0.05)。低表达miR-362-3p患者总体生存率较高表达miR-362-3p患者明显降低(P0.05)。转染miR-362-3p模拟物后,胆囊癌细胞的增殖,迁移及侵袭能力明显减弱(均P0.05)。Nemo样激酶(NLK)被确定为miR-362-3p的潜在靶基因,转染NLK过表达载体后,miR-362-3p模拟物对胆囊癌细胞的上述作用被明显逆转(均P0.05)。结论:miR-362-3p在胆囊癌中表达下调,下调的miR-362-3p减少了对靶基因NLK的抑制,从而促进了胆囊癌细胞的增殖、迁移和侵袭。     

Expression of vascular endothelial growth factor-C in gastric carcinoma and the effect of its antisense gene transfection on the proliferation of human gastric cancer cell line SGC-7901

PurposeThe aim of this study was to investigate the relationship between the expression of vascular endothelial growth factor-C (VEGF-C) in gastric carcinoma and tumor lymphangiogenesis and to determine the effect of antisense–VEGF-C gene transfection on proliferation.MethodsAdjacent cancer tissues were collected from 72 gastric carcinoma cases and compared with 10 nongastric carcinoma tissues to detect the expression of VEGF-C and its messenger RNA (mRNA) and calculate the density of neonatal lymphatic microvessels. The in vitro–cultured gastric cancer cell line SGC-7901 was transfected with recombinant plasmid pCI-neo-anti VEGF-C. The expression in the transfected cells and the proliferation were determined.ResultsThe positive rate of VEGF-C mRNA in the lymph node metastasis tissues was 85.7% compared with negative controls (20%, P < .05). The density of lymphatic vessels in the metastasis group was 6.65 ± 1.57 compared with the negative group (3.75 ± 1.47, P < .05). Protein and mRNA of VEGF-C were reduced in transfected cells. Proliferation was inhibited as well.ConclusionsVEGF-C can increase the invasiveness of gastric cancer and promote lymphangiogenesis in adjacent tissues. Transfection with antisense VEGF-C can reduce the expression of VEGF-C and inhibit the proliferation. VEGF-C can inhibit the tumor growth and reduce its metastasis and recurrence.     

microRNA-139-5p及其靶基因Notch1在结直肠癌中的作用

目的：探讨microRNA-139-5p（miR-139-5p）在结直肠癌中的表达及其对结直肠癌细胞转移和侵袭的影响。 方法：用荧光定量PCR方法检测miR-139-5p在结直肠癌组织与不同结直肠癌细胞株中的表达变化;用Boyden小室分析和伤口愈合实验检测miR-139-5p转染及miR-139-5p抑制对结直肠癌细胞转移和侵袭能力的影响;生物信息学方法预测miR-139-5p的靶基因,并采用荧光素酶报告基因实验验证,Western blot方法检测miR-139-5p转染对靶基因表达的影响。 结果：与各自的正常对照组比较,结直肠癌组织与结直肠癌细胞系中miR-139-5p表达均明显降低（P<0.05）。结直肠癌DLD1细胞和HCT116细胞转染miR-139-5p后,转移与侵袭能力均明显降低（均P<0.05）,而miR-139-5p抑制剂处理后,两种细胞的的侵袭能力均明显增强（均P<0.05）。生物信息学预测显示,Notch1是miR-139-5p的靶基因,且得到荧光素报告实验结果证实。Western blot结果显示,转染miR-139-5p后,结直肠癌DLD1细胞和HCT116细胞中Notch1蛋白表达均明显下调（均P<0.05）。 结论：miR-139-5p可能通过调节Notch1的表达而抑制肿瘤细胞的转移和侵袭,而下调的miR-139-5p可能在结直肠癌的发生发展中起了重要作用。     

MicroRNA-7对HCCC9810细胞增殖、迁移和侵袭的研究

目的探讨MicroRNA-7(miR-7)对于肝内胆管癌细胞HCCC9810增殖、迁移、侵袭能力的影响。方法利用实时定量PCR对于肝内胆管癌病人的癌组织和癌旁组织,以及正常肝内胆管上皮细胞和肝内胆管癌细胞HCCC9810中miR-7表达水平的验证;培养人肝内胆管癌细胞HCCC9810,将其分为研究组(miR-7 mimics)和阴性对照组(miR-7 NC),分别进行miR-模拟物以及miR-阴性序列的转染,效率验证后,通过CCK-8实验,EDU实验,克隆形成实验,以及划痕和Transwell实验分别验证两组细胞的增殖、迁移和侵袭的能力。结果肝内胆管癌病人中癌组织miR-7的表达水平低于癌旁组织,肿瘤细胞HCCC9810 miR-7表达水平低于正常胆管上皮细胞;细胞转染效率验证显示,miR-7 mimics组HCCC9810细胞中miR-7的相对表达水平远高于miR-7 NC组,差异具有统计学意义(P<0.05);与miR-7NC相比,miR-7 mimics组细胞的增殖、迁移以及侵袭能力被明显抑制,差异均有统计学意义(均P<0.05)。结论miR-7在肝内胆管癌中表达水平下调,而且过表达miR-7能够抑制肿瘤细胞的增殖、迁移以及侵袭过程。     

miR-200a-3p在胆囊癌中的表达及其作用与机制

背景与目的 miR-200a-3p参与了多种肿瘤的生物学过程的调控,但在不同肿瘤中起着不同的作用（促癌基因或抑癌基因）。目前,其在胆囊癌中的作用尚不清楚。因此,本研究探讨miR-200a-3p在胆囊癌中的表达及其对胆囊癌细胞生物学功能的影响与机制。方法 采用qRT-PCR法测定32例胆囊癌及癌旁组织、胆囊癌细胞系（GBC-SD、SGC-996、NOZ）及正常人胆囊上皮细胞系HGBEC中miR-200a-3p的表达。采用Lipofectamine? 3000试剂盒将GBC-SD及NOZ细胞系分别转染miR-200a-3p模拟物（miR-200a-3p过表达组）、miR-200a-3p抑制物序列（miR-200a-3p沉默组）及阴性对照序列（阴性对照组）。MTT实验测定细胞增殖能力,Transwell实验测定细胞侵袭能力,MiRBD/Targetscan7.2/starBase2.0/miRtarbase网站预测miR-200a-3p的下游靶基因,并采用荧光素酶实验验证。Western blot检测上述3组细胞中靶基因与上皮间质转化（EMT）相关分子蛋白（E-cadherin、vimentin）的表达。结果 qRT-PCR结果显示,胆囊癌组织中miR-200a-3p表达量低于癌旁组织,所有胆囊癌细胞系中miR-200a-3p表达量低于正常人胆囊上皮系HGBEC（均P<0.05）。GBC-SD及NOZ细胞系转染后,与各自的阴性对照组比较,两种细胞的miR-200a-3p过表达组miR-200a-3p表达量明显升高、增殖与侵袭能力明显减弱,两种细胞的miR-200a-3p沉默组miR-200a-3p表达量明显降低、增殖与侵袭能力明显增强（均P<0.05）。在线网站预测显示,miR-200a-3p和Notch2存在潜在结合位点;荧光素酶实验显示,miR-200a-3p导致Notch2野生型质粒pmirGLO-Notch2-3''UT WT荧光素酶活性明显降低,而miR-200a-3p对Notch2突变型质粒pmirGLO-Notch2-3''UTR MUT的荧光素酶活性没有影响。Western blot结果显示,两种细胞的miR-200a-3p过表达组与各自的阴性对照组比较,E-cadherin蛋白表达量升高、vimentin蛋白与Notch2蛋白表达量降低,而3种蛋白在两种细胞的miR-200a-3p沉默组则呈相反的变化（均P<0.05）。结论 miR-200a-3p在胆囊癌中表达降低,并可能起了抑癌基因的作用,其抑制胆囊癌细胞增殖和侵袭的机制可能与靶向下调Notch2从而抑制EMT过程有关。     

MALAT1对膀胱癌UMUC3细胞功能的影响及下游基因的筛选

【摘要】目的 研究MALAT1对膀胱癌UMUC3细胞系增殖、迁移、侵袭、克隆形成能力的影响,探讨MALAT1在膀胱癌中的作用机制。方法 化学合成针对MALAT1的siRNA,脂质体法转染UMUC3细胞。反转录实时定量聚合酶链式反应(RT-qPCR)测定转染效率,MTS法检测增殖变化,Transwell法检测迁移、侵袭改变,克隆形成实验观察克隆形成能力变化,5-乙炔基-2′-脱氧尿苷(EDU)法检测增殖及周期改变,基因芯片筛选潜在作用通路。结果 干扰MALAT1表达后,膀胱癌UMUC3细胞株增殖、侵袭、迁移、克隆形成能力下降,基因芯片结果发现肿瘤通路相关基因MMP9等明显改变。 结论 MALAT1促进UMUC3膀胱癌细胞的增殖、侵袭、迁移、克隆形成能力,提示可能与其引起肿瘤通路相关基因的激活和失活相关。     

miR-126在胃癌中的表达及其靶基因Crk的鉴定

目的:分析miR-126在胃癌中的表达水平并鉴定miR-126的靶基因,以阐明miR-126在胃癌发生机制中的功能。方法:采用qRT-PCR分别检测miR-126在胃癌细胞株、正常胃黏膜组织、永生化胃黏膜上皮细胞、胃癌及配对癌旁组织的表达水平,并与胃癌组织的临床病理指标进行相关性分析。采用生物信息学方法预测出miR-126的靶基因,并通过荧光素酶报告系统加以验证;采用qRT-PCR及Western印迹法检测miR-126对靶基因mRNA及蛋白质表达水平的影响。结果:qRT-PCR检测结果显示,miR-126在胃癌细胞株中的表达水平明显低于其在正常胃黏膜组织及永生化胃黏膜上皮细胞株的表达水平。miR-126在60例病人的胃癌组织中表达的水平显著低于其在配对癌旁组织中表达的水平;且胃癌组织miR-126表达水平低者,肿瘤组织体积较大,胃壁浸润较深,易发生淋巴结转移,病理分期也较晚。生物信息学分析提示Crk mRNA的3′UTR含有miR-126直接作用的靶序列,荧光素酶报告系统检测进一步验证了该靶序列,qRT-PCR及Western印迹法证实miR-126对Crk蛋白表达的调控发生在转录后水平。结论:miR-126有望成为研究胃癌的新型标志物;miR-126通过对其靶基因Crk的调控参与了胃癌的发生、发展过程。     

MiR-29a通过调节HuR影响前列腺癌细胞的生物学行为

目的 研究前列腺癌中miR-29a 对HuR表达的调节，进而影响细胞增殖、迁移、侵袭、凋亡。方法 通过实时荧光定量（qRT-PCR）和免疫印迹法（Western blot）检测在正常前列腺上皮细胞RWPE-1和激素非依赖性前列腺癌细胞PC-3内miR-29a、人抗原R(HuR) mRNA和蛋白的表达水平；miR-29a mimics(模拟剂)、inhibitor（抑制剂）和NC miRNA(对照剂)转染PC-3细胞48 h后检测miR-29a、HuR mRNA和蛋白的表达水平。细胞增殖试剂盒(CCK-8)、迁移和侵袭实验（Transwell小室）、流式细胞术分别检测PC-3细胞被转染后细胞增殖、迁移侵袭、凋亡的改变。结果 与RWPE-1细胞相比，PC-3细胞中miR-29a的表达下调，HuR mRNA和蛋白的上升（P<0.05）。与对照组相比，miR-29a mimics(模拟剂)、inhibitor（抑制剂）转染PC 3细胞后HuR mRNA无改变，但是能够改变HuR蛋白的表达（P<0.05）。MiR-29a能够抑制细胞增殖、迁移、侵袭，促进细胞凋亡（P<0.05）。结论 在前列腺癌PC-3细胞中，miR-29a通过调节HuR蛋白的表达，进而对细胞增殖、迁移、侵袭、凋亡产生影响。     

microRNA-34a的表达对膀胱癌细胞系J82生物学行为的影响

目的:探讨microRNA-34a(miR-34a)的外源性表达对人膀胱癌J82细胞生物学行为的影响。方法:将miR-34a表达质粒或对照质粒转染J82细胞,实时定量逆转录聚合酶链反应(qRT-PCR)检测miR-34a在转染细胞中的表达水平,细胞计数法、流式细胞术、Transwell侵袭实验分别检测外源性miR-34a表达后J82细胞增殖、凋亡、周期和侵袭能力的变化情况。结果:miR-34a表达质粒组与对照组比较,其miR-34a表达诱导性升高(P=0.002 6),细胞增殖受到抑制(P=0.000 1),细胞凋亡率增加(1.237%±0.116%vs 5.497%±0.293%;P<0.000 1),细胞周期阻滞于G0～G1期(54.510%±1.501%vs 62.200%±0.754%;P=0.001 5);细胞侵袭能力降低,(65.01±11.79)vs(34.33±9.71),P=0.025 4。结论:在膀胱癌J82细胞中增加miR-34a的表达,可抑制细胞增殖和侵袭,促进细胞凋亡和周期阻滞,并通过影响上述细胞生物学行为降低肿瘤细胞恶性度,miR-34a在膀胱癌细胞系中发挥潜在的抑癌基因作用。     

microRNA-155对于人膀胱癌细胞um-uc-3的迁移和侵袭能力影响的研究

【摘要】〓目的〓前期研究发现miR-155在多种实体瘤中具有促肿瘤细胞增殖的作用,本研究探讨miR-155对人膀胱癌细胞um-uc-3转移相关的生物学行为的影响。方法 (1)通过组织RNA研究,来讨论miR-155在膀胱癌组织中的表达差异;(2)将人工合成miR-155-mimics转入人膀胱癌细胞um-uc-3,并设立对照组;(3)通过qRT-PCR检测miR-155的转染效率;(4)划痕试验研究过表达miR-155的um-uc-3细胞迁移能力变化;(5)Transwell试验检测miR-155对um-uc-3细胞迁移、侵袭的影响;(6)Western-blot及qPCR检测肿瘤转移相关基因的表达情况。结果〓(1)组织中,qRT-PCR证实miR-155的表达量在膀胱癌组织中较癌旁组织增高;(2)qRT-PCR检测miR-155转染效率,实验组表达量明显增高(P<0.01);(3)划痕实验证实miR-155过表达的um-uc-3细胞有更强的迁移能力;(4)Transwell试验发现miR-155可以促进um-uc-3细胞迁移、侵袭,与对照组差异显著(P<0.01);(5)过表达miR-155的um-uc-3细胞中,β-catenin、vimentin、snail的表达量在RNA水平和蛋白水平都比对照组显著增高,但不涉及claudin-1。结论〓miR-155可以促进人膀胱癌细胞um-uc-3的迁移和侵袭。     

circRAD18/miR-516b/PDK1轴调节葡萄糖代谢重编程与结直肠癌增殖的关系

背景与目的 环状RNA circRAD18被发现在乳腺癌和甲状腺癌的进展中起了促进作用,但其在其他恶性肿瘤的表达及作用尚未被充分揭示。笔者前期通过生物信息学软件预测circRAD18可与miR-516b互补结合,而葡萄糖代谢关键调节酶丙酮酸脱氢酶激酶1（PDK1）可能是miR-516b的靶基因。因此,本研究初步探讨circRAD18在结直肠癌细胞中的表达及作用,及其对靶miRNA及下游靶基因的调控关系。方法 用qRT-PCR检测不同结直肠癌细胞系（SW480、SW620、HT-29）及正常结直肠上皮细胞（NCM460）中circRAD18的表达;用si-circRAD18沉默结直肠癌细胞中circRAD18的表达后,分别用CCK-8实验和相应的试剂盒检测细胞的增殖情况以及葡萄糖摄取量和乳酸产生量。用双荧光素酶报告基因实验与RNA免疫沉淀（RIP）实验分析circRAD18、miR-516b及PDK1之间的结合关系;最后,采用过表达/敲低实验进一步验证三者之间的关系。结果 与正常结直肠上皮细胞比较,circRAD18在各结直肠癌细胞系中的表达均明显上调（均P<0.05）;转染si-circRAD18后,结直肠癌细胞增殖能力、葡萄糖摄取及乳酸产生量均明显降低（均P<0.05）;双荧光素酶报告基因实验与RIP实验证实circRAD18可与miR-516b结合,而PDK1是miR-516b的下游靶基因。miR-516b模拟物及si-circRAD18的转染可明显抑制细胞葡萄糖摄取、乳酸产生及PDK1蛋白表达,且补充PDK1可逆转该抑制作用（均P<0.05）。结论 circRAD18在结直肠癌细胞中表达上调,并与结直肠癌细胞增殖能力的增强密切相关,作用机制可能与circRAD18通过海绵样吸附miR-516b后,上调PDK1表达,从而导致结直肠癌细胞葡萄糖代谢重编程有关。     

微小RNA-618通过靶向羧基末端结合蛋白2抑制胰腺癌细胞增殖、侵袭和迁移

目的:探讨微小RNA(miR)-618及羧基末端结合蛋白2(CtBP2)对胰腺癌增殖、侵袭和迁移的影响及其作用机制。方法:采用实时定量反转录聚合酶链反应(RT-qPCR)检测胰腺癌细胞中miR-618的表达;分别转染miR-618 inhibitor和mimics后,采用细胞计数试剂盒(CCK-8)、克隆集落形成及Tr...     

lncRNA XIST is associated with preeclampsia and mediates trophoblast cell invasion via miR-340-5p/KCNJ16 signaling pathway

BackgroundPreeclampsia (PE) is a syndrome commonly occurring among the pregnant. Shallow trophoblast invasion is considered to be closely related to PE. Therefore, in trophoblast cells, we explored the potential mechanisms of lncRNA XIST in the modulation of trophoblast invasion and proliferation.MethodsGEO online analyzer was used to screen the abnormally expressed RNAs in placenta tissues from patients with severe PE and healthy controls. The prediction of target bindings was performed on TargetScan and starBase. Transfection was conducted to regulate the RNA expression levels in trophoblast cells, HTR-8/SVneo. RT-qPCR measured expression of lncRNA XIST, miR-340-5p and KCNJ16. The CCK-8 assay examined cell viability. Flow cytometer analyzed apoptosis and luciferase assay determined the luciferase activity. Transwell assays detected the invasion and western blot verified the changes in protein expression of MMP2, MMP9 and KCNJ16 in trophoblast cells.ResultslncRNA XIST expression was enhanced in PE patients. Upregulation of lncRNA XIST in HTR-8/SVneo cells inhibited the cell proliferation and invasion, and induced apoptosis. XIST upregulation inhibited MMP2 and MMP9 protein expression. lncRNA XIST/ KCNJ16 interplayed as ceRNAs of miR-340-5p. Specifically,miR-340-5p overexpression reversed the effect of XIST upregulation on the cell apoptosis, proliferation and invasive ability and the knockdown of KCNJ16 could add to the effect of miR-340-5p overexpression in HTR-8/SVneo.ConclusionlncRNA XIST was upregulated in PE. Upregulation of lncRNA XIST exerted the inhibitory effects on the proliferation and invasion of trophoblast cells through the interactions with miR-340-5p/KCNJ16, which suggests that the lncRNA XIST/miR-340-5p/KCNJ16 axis might play a role in PE.     

长链非编码RNA MCM3AP-AS1靶向调控miR-876-5p对卵巢癌细胞增殖和转移的影响

目的探讨长链非编码RNA MCM3AP-AS1(MCM3AP antisense RNA 1,MCM3AP-AS1)靶向调控微小RNA-876-5p(miR-876-5p)对卵巢癌SKOV3细胞增殖和转移的影响。方法选取2017年4月至2018年5月温州市中心医院妇产科收治的40例卵巢癌患者癌组织和相应癌旁组织标本,及卵巢癌细胞系(CaOV3、SKOV3、OVCAR3、OV90)和正常卵巢上皮细胞系(HOSE)。采用实时定量聚合酶链式反应法(qRT-PCR)检测卵巢癌组织和细胞中lncRNA MCM3AP-AS1的表达水平;建立lncRNA MCM3AP-AS1低表达模型,采用MTT实验检测卵巢癌细胞增殖,采用transwell检测卵巢癌细胞的迁移和侵袭水平;采用生物信息分析、荧光素酶实验、qRT-PCR验证lncRNA MCM3AP-AS1和miR-876-5p的靶向关系。结果lncRNA MCM3AP-AS1在卵巢癌组织中的水平为(8.45±0.86),高于癌旁组织(4.45±0.45);在卵巢癌细胞中的水平为CaOV3(1.53±0.12),SKOV3(1.82±0.23),OVCAR3(1.34±0.12),高于正常卵巢上皮细胞HOSE(1.00±0.10);下调lncRNA MCM3AP-AS1能降低卵巢癌细胞增殖、迁移和侵袭;lncRNA MCM3AP-AS1能与miR-876-5p相互作用并下调其表达。结论lncRNA MCM3AP-AS1可通过靶向抑制miR-876-5p促进卵巢癌细胞的增殖、迁移和侵袭。     

High expression of polo-like kinase 1 is associated with the metastasis and recurrence in urothelial carcinoma of bladder

ObjectivesPolo-like kinase 1 (Plk1) has been widely pursued as an oncology target because it is overexpressed in several human tumor types. To investigate whether Plk1 plays a general role in bladder urothelial carcinoma, we examined the expression of Plk1 protein in bladder urothelial carcinoma and cell lines, and analyzed the relationship among Plk1 protein expression, metastasis, and recurrence of urinary bladder urothelial carcinoma.MethodsImmunohistochemistry was used to detect the expression of Plk1 in 120 bladder urothelial carcinoma. Moreover, the expression of Plk1 was analyzed by Western blot in 60 bladder urothelial carcinoma and 21 normal epithelial tissues. MTT assay and flow cytometry and transwell assay were used to examine the proliferative and invasive ability of bladder cancer cells with the treatment of scytonemin (the inhibitor of Plk1). Statistical analysis was used to discuss the association between Plk1 expression and clinicopathologic parameters, tumor metastasis and recurrence, and the proliferative and invasive ability and cell cycle process of the bladder cancer cells.ResultsThere was a significantly higher Plk1expressions in bladder urothelial carcinoma and highly invasive bladder T24 cells than those in bladder normal tissues and the superficial bladder BIU-87 cells. Plk1 expression was positively correlated with histologic grade, pT stage, recurrence, and metastasis. With the increasing concentration of scytonemin, we found that not only the cell proliferation and invasion activity decreased significantly, but also the cell cycle was blocked at G2/M stage.ConclusionPlk1 expression status was closely correlated with important histopathologic characteristics (grades and stages) and the recurrence and metastasis of bladder urothelial carcinomas. Furthermore, Plk1 played an important function on the bladder cancer cells' proliferation by regulating the cancer cell cycle from G1/S to G2/M and probably promoted the invasion and metastasis of bladder cancer.     

Hypoxia induces the overexpression of microRNA-21 in pancreatic cancer cells

BackgroundPancreatic cancer cells exist in a hypoxic microenvironment containing numerous factors that impact tumor survival, proliferation, and metastasis. MicroRNAs (miRs) are differentially expressed in cancer but also altered by hypoxia. We hypothesized that hypoxia could induce expression of miR-21, an oncomir in pancreatic cancer cells.Materials and methodsWe examined how hypoxia regulates miR-21 expression in pancreatic cancer cell lines (BxPC-3, AsPC-1) by stem-loop RT-PCR. Chromatin immunoprecipitation assays were used to study how hypoxia alters hypoxia-inducible factor (HIF)-1α binding to the hypoxia response element of miR-21. BxPC-3 and AsPC-1 cells were transfected with a constitutively stable HIF-1α subunit or vector control (pcDNA3.1) to determine the influence of miR-21 in normoxia. The effect of mature miR-21 sense and antisense oligonucleotides on proliferation and apoptosis in hypoxic and normoxic conditions was assessed via WST-1 assay and flow cytometry.ResultsMiR-21 levels increased in all cell lines grown in hypoxic conditions versus normoxia, whereas siRNA targeting HIF-1α reduced miR-21 expression. Hypoxic conditions resulted in direct binding of HIF-1α to the predicted binding site in miR-21. Transfection with a constitutively stable HIF-1α expression plasmid in normoxia resulted in upregulated miR-21, similar to that seen in hypoxia. Cells transfected with antisense constructs targeting miR-21 had reduced proliferation and increased apoptosis in normoxia, whereas miR-21 overexpression abrogated hypoxia-associated reductions in proliferation.ConclusionsMiR-21 is induced by hypoxia in pancreatic cancer cells via HIF-1α upregulation. MiR-21 overexpression allows cells to avoid apoptosis in a hypoxic microenvironment. Inhibition of miR-21 expression may increase cellular susceptibility to hypoxia in pancreatic cancer.