RP11-366L20.3通过NF-κB通路调控E-cadherin表达

目的研究长链非编码RNA RP11-366L20.3在调控炎症因子表达中的作用。方法运用脂多糖(lipopolysaccharide,LPS)刺激THP-1细胞6 h,然后收集细胞提取RNA并通过RT-qPCR筛选上调表达的长链非编码RNA,RACE(c DNA末端快速扩增)获取其基因全长,Northern blot验证基因的真实长度和LPS刺激效果,细胞通路抑制剂分析其转录调控通路和胞内分布,过表达和siRNA处理细胞分析RP11-366L20.3调控的下游炎症因子及机理。结果筛选出一个长链非编码RNA RP11-366L20.3,LPS刺激能上调该基因的表达,RACE扩增全长为833 bp,Northern blot也验证了RACE的实验结果,RP11-366L20.3主要分布于细胞核,其基因的转录受到NF-κB信号通路调控;同时RP11-366L20.3是一个TLR4通路的非编码RNA,过表达RP11-366L20.3能降低E-cadherin的基因表达,而siRNA敲低RP11-366L20.3则能上调E-cadherin的基因表达,RIP实验表明RP11-366L20.3能与P50蛋白直接结合,LPS刺激能增强RP11-366L20.3与p50的结合,从而抑制E-cadherin的基因表达。结论长链非编码RNA RP11-366L20.3通过NF-κB通路因子P50调控E-cadherin的基因表达。     

SIRT1通过NF-κB通路调节结直肠癌细胞HCT116增殖和活力

目的探讨SIRT1是否通过NF-κB通路来调节结直肠癌细胞HCT116点增殖和活力。方法选用结直肠癌细胞HCT116,通过转染SIRT1质粒来过表达SIRT1,此为过表达组;通过siRNA来敲低SIRT1,此为敲低组;用MTT法、CCK-8法和克隆形成试验来测定HCT116细胞的增殖和活力情况;通过免疫印迹试验来检测NF-κB通路相关蛋白的表达情况。结果过表达组中,p-P65、p-IKKalpha的表达量明显降低(P<0.05),而P65和IKKalpha的总体表达量没有明显差异(P>0.05),HCT116的生长速度、增殖速率以及细胞活力明显降低(P<0.05);敲低组中,p-P65、p-IKKalpha的表达量明显上升(P<0.05),而P65和IKKalpha的总体表达量没有明显差异(P>0.05),HCT116的生长速度、增殖速率以及细胞活力明显上升(P<0.05)。在过表达SIRT1的同时,用NF-κB的抑制剂Curcumin处理HCT116后,NF-κB通路相关蛋白的表达量以及HCT116的生长速度和增殖速率无明显变化(P>0.05)。结论 SIRT1通过抑制NF-κB的激活来降低结直肠癌细胞HCT116增殖和活力。     

鼻咽癌中NF-κB对Hedgehog通路基因表达的影响

目的 Hedgehog通路与NF-κB均被发现与多种癌症相关,本研究初步探讨在鼻咽癌中两者之间的相关性,从而为靶点治疗等临床应用提供可靠的实验依据。方法提取12例鼻咽癌、鼻咽炎患者病例样本总RNA反转录得m RNA的c DNA进行荧光定量PCR,通过统计相关系数得出Hedgehog通路与NF-κB相关性;利用不同浓度NF-κB抑制剂PDTC(50~400μmol/L)作用24 h鼻咽癌细胞株CNE1,以CCK8法检测PDTC对CNE1增殖的影响;并对受不同浓度PDTC影响下CNE1的Hedgehog通路与NF-κB基因表达进行荧光定量PCR测定。结果鼻咽癌、鼻咽炎病例样本中Hedgehog通路基因Gli、PTCH、SMO与NF-κB相关系数大于0.8,呈现较强的相关性;PDTC对CNE1有显著的增殖抑制,而且显著抑制NF-κB及Hedgehog通路各基因的表达。结论鼻咽癌中NF-κB与Hedgehog有较强的相关性,NF-κB抑制剂PDTC能显著抑制鼻咽癌细胞株CNE1增殖以及NF-κB、Hedgehog信号通路基因表达。     

RNA干扰Notch1基因对乳腺癌MCF-7细胞增殖及凋亡的影响

目的探讨RNA干扰技术沉默Notch1基因表达对人乳腺癌细胞增殖和凋亡的影响。方法设计并合成靶向Notch1基因的小分子干扰RNA质粒,在转染试剂Sofast介导下转染人乳腺癌细胞株MCF-7,用RT-PCR和Western blot法检测转染前、后Notch1基因的表达,挑选干扰效率最强的一组表达载体;cck8比色法检测分析各组细胞的存活率;流式细胞术检测细胞凋亡比例;Western blot法检测转染各组MCF-7细胞Notch1、NF-κB及Caspase-3蛋白表达。结果 Notch1-shRNA能有效封闭Notch1基因的表达,Notch1基因和蛋白表达水平明显降低(P<0.05);Notch1-shRNA能明显抑制细胞增殖(P<0.05);转染48h后细胞凋亡比例增加(P<0.01)。NF-κB蛋白水平表达降低,Caspase-3蛋白表达水平增高。结论利用RNA干扰技术沉默Notch1基因的表达可以明显抑制MCF-7细胞的增殖,促进MCF-7细胞凋亡,其机制可能通过NF-κB信号通路调节相关凋亡蛋白的表达,进而影响细胞的凋亡和增殖,靶向Notch1的RNA干扰技术在乳腺癌的基因治疗中具有一定的研究价值。     

p53 和NF-κB 信号通路在MTB 感染AECⅡ细胞中的免疫调控作用研究

目的：研究在结核分枝杆菌（MTB）感染肺泡Ⅱ型上皮细胞（AECⅡ）过程中,p53和NF-κB信号通路中相关信号分子是否参与了抗结核的先天免疫调控。方法：利用实时荧光定量PCR、Western blot和蛋白芯片技术,通过过表达和抑制AECⅡ细胞中的p53和NF-κB基因,分析在牛结核分枝杆菌弱毒株卡介苗（BCG）感染过程中p53和NF-κB信号通路的信号分子和细胞炎症因子的表达变化,并探讨p53与NF-κB信号通路在AECⅡ细胞抗MTB感染免疫应答中的“cross-talk”关系。结果：在A549细胞中,p53信号通路通过p53协同CBP来负调控NF-κB、TLR-4及TRAF6的表达,从而抑制NF-κB信号通路的活化,并上调IL-6、IL-8、TNF-α、IFN-γ的表达;而NF-κB信号通路通过NF-κB协同TLR-4、TRAF6与CBP来负调控p53与MDM2的表达,从而抑制p53信号通路的激活,同时上调了IL-6、IL-8、TNF-α、IFN-γ的表达。当BCG感染A549细胞时,p53信号通路中p53协同MDM2负调控CBP,进而上调NF-κB信号通路的TLR-4和TRAF6...     

lincRNA-p21通过STAT3信号抑制结直肠癌HCT116细胞增殖

目的:研究基因间区长链非编码RNA-p21(lincRNA-p21)通过STAT3信号通路对结直肠癌HCT116细胞生长抑制的影响。方法:通过细胞转染法构建lincRNA-p21过表达的人结直肠癌细胞株HCT116,转染空载体pcDNA3.1作为阴性对照组。转染后采用RT-qPCR法检测细胞中lincRNA-p21的水平,分别采用MTT法和平板集落形成实验检测细胞的活力和增殖情况,采用Western blot法测定细胞中STAT3和磷酸化STAT3(p-STAT3)的蛋白水平。用STAT3信号通路激活剂SD19处理lincRNA-p21过表达的HCT116细胞,Western blot检测STAT3和p-STAT3的蛋白水平,MTT法检测细胞活力的变化,流式细胞术检测细胞凋亡情况。结果:与control组和pcDNA组相比,pcDNA-lincRNA-p21组细胞中lincRNA-p21的表达明显上调,细胞生长受到抑制,STAT3和p-STAT3的蛋白水平降低(P0.05)。STAT3激活剂SD19处理过表达lincRNA-p21的HCT116细胞后,与pcDNA-lincRNA-p21组相比,pcDNA-lincRNA-p21+SD19组细胞中STAT3和p-STAT3的蛋白水平升高,细胞活力升高,细胞凋亡率降低(P0.05)。结论:lincRNA-p21过表达可以抑制结直肠癌HCT116细胞的生长;激活STAT3信号通路可促进HCT116细胞的生长;lincRNA-p21可通过抑制STAT3信号激活而抑制HCT116细胞的增殖。     

冬凌草甲素通过上调miR-204-5p抑制PC-3细胞迁移与侵袭的作用机制研究

目的 探索冬凌草甲素影响PC-3细胞迁移及侵袭的作用及机制,为冬凌草甲素治疗前列腺癌骨转移提供前期体外实验参考。 方法 通过CCK8检测冬凌草甲素对PC-3细胞增殖的影响,Transwell检测冬凌草甲素对PC-3细胞迁移和侵袭的影响,qRT-PCR分析冬凌草甲素溶液处理PC-3细胞后miR-204-5p及NF-κB信号通路表达情况,Western blotting分析冬凌草甲素溶液处理PC-3细胞后NF-κB信号通路蛋白表达情况。 结果 冬凌草甲素溶液以浓度依赖性和时间依赖性方式抑制PC-3细胞的增殖,与对照组相比差异有统计学意义（P<0.01）,冬凌草甲素IC50值为10 μmol/L;冬凌草甲素溶液呈浓度依赖性抑制PC-3细胞的迁移和侵袭,差异较对照组有统计学意义（P<0.01）;冬凌草甲素溶液能促进PC-3细胞表达miR-204-5p并阻断NF-κB信号通路下游基因表达;过表达miR-204-5p和冬凌草甲素均能抑制PC-3细胞NF-κB信号通路下游基因表达。 结论 冬凌草甲素能抑制PC-3细胞的增殖、迁移及侵袭,其作用机制可能与其能上调miR-204-5p阻断NF-κB信号通路有关。     

TRAF3抑制NF-κB引起的肾囊腔形成作用

目的:研究肿瘤坏死因子受体相关因子3(TRAF3)对多囊肾集合管上皮细胞中核因子κB(NF-κB)信号通路及其下游产物表达的影响;观察TRAF3基因过表达的多囊肾集合管上皮细胞形成管状分支结构的变化,探讨TRAF3在多囊肾囊腔形成的发生发展中可能产生的作用。方法:Western blot检测多囊肾集合管上皮细胞和TRAF3基因过表达多囊肾集合管上皮细胞中NF-κB信号通路的变化,同时检测下游凋亡因子Bax及Bid的表达及caspase-3活性变化;通过Annexin V-FITC/PI双染法检测各组细胞的凋亡情况;应用三维(3D)培养法观察多囊肾集合管上皮细胞形成管状分支结构变化的差异。结果:TRAF3的过表达能显著抑制多囊肾集合管上皮细胞中NF-κB信号通路的活性,使下游的Bax及Bid表达显著下调,细胞凋亡明显减少;TRAF3基因过表达多囊肾集合管上皮细胞管状分支结构较多囊肾集合管上皮细胞组明显增多。结论:TRAF3可能通过调节NF-κB信号通路降低Bax及Bid活性,抑制细胞凋亡,从而抑制多囊肾囊腔形成。     

星形细胞上调基因-1的研究进展

星形细胞上调基因-1(AEG-1)在多种恶性肿瘤中显著高表达,在肿瘤的发生、增殖、血管生成、抗凋亡、侵袭转移及抗药性等多方面发挥重要作用,还参与炎性反应和自然免疫过程。研究表明AEG-1与PI3K/Akt、NF-κB、Wnt/β-catenin等多种信号通路相关,同时参与RNA诱导沉默复合体介导的基因沉默。因此,AEG-1有望成为肿瘤靶向治疗的新靶点。     

Trx-1过表达通过NF-κB信号通路减轻MPP~+所致PC12细胞的氧化应激损伤

目的:探讨硫氧还蛋白1(Trx-1)过表达通过NF-κB信号通路减轻1-甲基-4-苯基吡啶离子(MPP~+)诱导的大鼠嗜铬细胞瘤PC12细胞氧化应激损伤的作用,探讨帕金森病的发病机制。方法:采用1、3和5 mmol/L MPP~+损伤PC12细胞,MTT法检测细胞活力,商用试剂盒检测细胞上清液中氧化应激指标乳酸脱氢酶(LDH)和超氧化物歧化酶(SOD)活性及丙二醛(MDA)含量,Western blot检测细胞中Trx-1蛋白的表达。以3 mmol/L MPP~+损伤PC12细胞,以含Ad-Trx-1-GFP序列的慢病毒感染建立Trx-1过表达的帕金森病细胞模型,采用MTT法、商用试剂盒和Western blot分别检测Trx-1过表达对PC12细胞活力、氧化应激反应和NF-κB信号通路的影响。给予NF-κB信号通路激活剂佛波酯(PMA)作用于经MMP~+处理的P12细胞,观察激活NF-κB信号通路对PC12细胞活力和氧化应激反应的影响;给予NF-κB信号通路抑制剂吡咯烷二硫代氨基甲酸盐(PDTC)作用于Trx-1过表达的MPP~+损伤PC12细胞,观察Trx-1过表达通过NF-κB信号通路对PC12细胞活力和氧化应激反应的影响。结果:1、3和5 mmol/L MPP~+能够明显降低PC12细胞活力、细胞上清液中SOD活性和细胞内Trx-1蛋白的表达,升高细胞上清液中LDH活性和MDA含量,且3 mmol/L MPP~+和5 mmol/L MPP~+的作用明显大于1 mmol/L MPP~+(P0.05),而3 mmol/L MPP~+和5 mmol/L MPP~+间的差异无统计学显著性。Trx-1过表达能够明显减弱MPP~+对PC12细胞活力的抑制作用及其诱导的氧化应激损伤和NF-κB信号通路活化。NF-κB信号通路的激活促进了MPP~+对PC12细胞活力的抑制作用及其诱导的氧化应激损伤,而抑制NF-κB信号通路则增强了Trx-1过表达对MPP~+损伤的PC12细胞的保护作用。结论:Trx-1过表达可通过NF-κB信号通路减轻MPP~+作用下PC12细胞的氧化应激损伤。     

Knockdown of lncRNA SNHG7 inhibited cell proliferation and migration in bladder cancer through activating Wnt/β-catenin pathway

It is identified that long non-coding RNAs (lncRNAs) play important roles in tumorigenesis. LncRNA SNHG7 has been found to be an oncogene in varieties of tumors including bladder cancer. However, its potential regulatory mechanism in bladder cancer still remains unknown. In this study, we discovered that the expression levels of SNHG7 were significantly increased in bladder cancer tissues and cell lines. Patients with high expression level of SNHG7 suffered from poor prognosis. Additionally, knockdown of SNHG7 induced declined cell viability, proliferation as well as G0/G1 cell cycle arrest. Furthermore, we found that cell migratory ability was markedly reduced after silencing SNHG7. Next, we verified that knockdown of SNHG7 reduced the protein level of β-catenin and thus decreased the level of its downstream targets including c-myc, cyclin D1 and E-cadherin, implying that SNHG7 might impact bladder cancer via Wnt/β-catenin pathway. Subsequently, the rescue assays performed in SNHG7 silenced T24 cells by using activator of Wnt/β-catenin signaling elucidated that re-activation of this pathway partly restored the inhibitory effects of SNHG7 suppression on biological behaviors of T24 cells. Collectively, SNHG7 elicited carcinogenic functions in bladder cancer partially via activating Wnt/β-catenin signaling pathway, suggesting a potential target for the treatment and prognosis of bladder cancer.     

Latent membrane protein 2A inhibits expression level of Smad2 through regulating miR-155-5p in EBV-associated gastric cancer cell lines

Epstein-Barr virus (EBV) infection is one of the causes of gastric cancer (GC). Besides, previous studies have demonstrated that EBV-encoded latent membrane protein 2A (LMP2A) influences the pathogenesis of EBV-associated gastric cancer (EBVaGC) through regulating several key pathways. In this study, the expression level of Smad2 was observed, which was reduced in EBVaGC cell lines, especially in the presence of LMP2A. Meanwhile, we found that LMP2A promoted the expression of miR-155-5p by activated nuclear factor-κB (NF-κB) signaling. After being treated with NF-κB inhibitor (BAY 11-7082), miR-155-5p sharply decreased. Western blot analysis proved that the overexpression of miR-155-5p could inhibit Smad2. Functional studies showed that the role of miR-155-5p might lead to good prognosis in EBV-positive GC through promoting cell apoptosis and cell cycle arrest, as well as inhibiting tumor proliferation. In addition, p-Smad2 protein was also reduced or induced by overexpression or knockdown, respectively, of miR-155-5p. Immunofluorescence analysis further indicated that LMP2A prevented p-Smad2 from transferring to the nucleus, which played a crucial role in transforming growth factor-β (TGF-β) signaling. In summary, our findings confirmed the relationship between LMP2A and Smad2 and provided a potential regulation of the TGF-β pathway in EBVaGC.     

微小RNA-155通过调控核苷酸结合寡聚化结构域蛋白1/核因子κB信号通路加剧新生大鼠缺氧缺血性脑损伤

目的 探讨微小RNA-155（miRNA-155）是否通过调控核苷酸结合寡聚化结构域蛋白1（NOD1）/核因子κB（NF-κB）信号通路在新生大鼠缺氧、缺血性脑损伤中发挥作用。方法 选择新生雄性大鼠40只,分4组,每组10只。分别是假手术组、缺氧缺血组（HI组）、阴性对照组（NC antagomir组）、miRNA-155抑制组（miRNA-155 antagomir组）。大鼠经10%水合氯醛（400 mg/kg）麻醉后取左脑测定脑组织含水量;采用HE染色,于光学显微镜下观察各组大鼠脑海马组织病理形态学改变;采用Western blotting法检测各组大鼠脑组织中NOD1、NF-κB p65、NF-κB p50、磷酸化NF-κB p65（p-NF-κB p65）和p-NF-κB p50的蛋白表达水平;采用Real-time PCR法检测各组大鼠脑组织及血清中miRNA-155、NOD1、NF-κB p65和NF-κB p50的mRNA表达水平。结果 与假手术组相比,HI组和NC antagomir组新生大鼠脑组织含水量显著升高,miRNA-155 antagomir组显著降低（P＜0.05）;假手术组海马细胞排列整齐,细胞形态结构及层次清晰完整,无空泡,间质无水肿;HI组和NC antagomir组可见海马细胞排列紊乱,形成空泡,胶质细胞增生,细胞间隙增宽出现水肿,坏死细胞数增多;miRNA-155 antagomir组脑组织水肿明显减轻,海马细胞排列紊乱现象有所改善,坏死细胞数减少。与假手术组相比,HI组和NC antagomir组新生大鼠NOD1、p-NF-κB p65和p-NF-κB p50蛋白表达水平显著升高,而miRNA-155 antagomir组与HI组和NC antagomir组相比显著降低,差异均具有统计学意义（P＜0.05）;HI组和NC antagomir组新生大鼠脑组织及血清NOD1 mRNA表达水平显著高于假手术组,miRNA-155 antagomir组NOD1 mRNA表达水平与HI组和NC antagomir组相比显著降低（P＜0.05）,但各组大鼠NF-κB p65及NF-κB p50的表达水平差异无统计学意义（P＞0.05）。结论 MiRNA-155可通过调控NOD1/NF-κB信号通路促进新生大鼠缺氧、缺血性脑损伤,其作用机制可能与miRNA-155激活NOD1信号通路,促进下游NF-κB发生磷酸化,加剧缺氧、缺血新生乳大鼠脑组织炎症。     

右美托咪定对骨巨细胞瘤细胞增殖、侵袭及迁移的影响

目的探究右美托咪定(dexmedetomidine,DEX)对骨巨细胞瘤细胞增殖、侵袭及迁移的影响.方法将细胞分Control、DEX 0.01、0.1及1μmol/L组.BrdU检测细胞增殖,transwell检测细胞侵袭,划痕实验检测细胞迁移,免疫印迹检测Ki67、PCNA、Bcl-2、VEGF、MMP-2、MMP-9、NF-κB p65及其下游蛋白表达水平、p38 MAPK表达及其下游蛋白磷酸化比值.结果与Control组比较,DEX 0.1、1μmol/L组BrdU阳性细胞百分比、侵袭细胞数、划痕闭合率和Ki67、PCNA、Bcl-2、VEGF、MMP-2、MMP-9表达水平显著降低,抑制p38 MAPK、NF-κB信号通路的激活.结论DEX通过调控p38 MAPK及NF-κB表达抑制骨巨细胞瘤细胞增殖、侵袭及迁移.     

ATP1B3 cooperates with BST-2 to promote hepatitis B virus restriction

Increasing evidence indicates ATP1B3, one of the regulatory subunits of Na⁺/K⁺-ATPase, is involved in numerous viral propagations, such as HIV and EV71. However, the function and mechanism of ATP1B3 on hepatitis B virus (HBV) propagation is unknown. Here, we demonstrated that ATP1B3 overexpression reduced the quantity of hepatitis B surface antigen (HBsAg) and hepatitis B e antigen (HBeAg) in supernatants of HBV expression plasmids cotransfected HepG2 cells. Correspondingly, small interfering RNA and short hairpin RNA mediated ATP1B3 silencing promoted HBsAg and HBeAg expression in the supernatants of HBV expression plasmids transfected HepG2 cells. Mechanically, we reported that ATP1B3 expression could activate nuclear factor-κB (NF-κB) pathway by inducing the expression, phosphorylation, and nuclear import of P65 for the first time. And NF-κB inhibitor (Bay11) impaired the restraint of ATP1B3 on HBV replication. This counteraction effect of Bay11 proved that ATP1B3-induced NF-κB activation was crucial for HBV restriction. Accordingly, we observed that anti-HBV factors interferon-α (IFN-α) and interleukin-6 (IL-6) production were increased in HepG2 cells after the NF-κB activation. It suggested that ATP1B3 suppressed HBsAg and HBeAg by NF-κB/IFN-α and NF-κB/IL-6 axis. Further experiments proved that ATP1B3 overexpression induced anti-HBV factor BST-2 expression by NF-κB/IFN-α axis in HepG2 cells but not HEK293T cells, and ATP1B3 silencing downregulated BST-2 messenger RNA level in HepG2 cells. As an HBV restriction factor, BST-2 cooperated with ATP1B3 to antagonize HBsAg but not HBeAg in HepG2 cells. Our work identified ATP1B3 as a novel candidate of HBV restrictor with unrevealed mechanism and we highlighted it might serve as a potential therapeutic molecule for HBV infection.     

LncRNA SNHG14 promotes the progression of cervical cancer by regulating miR-206/YWHAZ

Accumulating evidence suggests that lncRNAs play key roles in many cancers. It has been reported that long non‐coding RNA SNHG14 promotes cell proliferation and metastasis in multiple cancers. However, the role and underlying molecular mechanism of SNHG14 in cervical cancer (CC) remain largely unclear. In this study, we discovered that the relative expression of SNHG14 was significantly upregulated in CC tissues and cells, and associated with the overall survival of CC patients. Moreover, knockdown of SNHG14 significantly inhibited cell proliferation, migration and invasion, and promoted cell apoptosis in CC. Molecular mechanism explorations revealed that SNHG14 acted as a sponge of miR-206 and that YWHAZ was a downstream target gene of miR-206 in CC. Spearman’s correlation analysis uncovered a significantly negative correlation between SNHG14 (or YWHAZ) and miR-206 expression, while a significantly positive correlation between SNHG14 and YWHAZ expression in CC tissues. We also found that the effect of SNHG14 knockdown on the CC progression could be partly rescued by overexpression of YWHAZ at the same time. Our findings revealed that SNHG14 acted as a sponge of miR-206 to regulate the expression of YWHAZ in CC, hinting the promising therapeutic target role of SNHG4 for CC patients.