恶性肿瘤中MNX1反义RNA 1的作用及机制研究进展

<正>长链非编码RNA (long non-coding RNA,lncRNA)是一类广泛存在于细胞核和细胞质内、长度在200 nt以上、缺少开放阅读框、不参与或很少参与蛋白质编码、主要从蛋白编码基因的反义链及间隔区转录出来的RNA^[1-6]。已有大量研究证实,lnc RNA涉及调控多种生物学功能,比如细胞增殖、凋亡及血管生成^[7-9]。表达异常的lnc RNA与诸多肿瘤的发生发展密切相关^[10-11]。     

lncRNA-TUG1作为竞争性内源RNA在心血管疾病中的研究进展

<正>长链非编码RNA(long no-coding RNA,lncRNA)是指长度超过200个核苷酸的RNA分子,虽然本身并不具备直接编码蛋白质的作用,却可通过参与多种生物过程,包括细胞增殖、分化、凋亡等介导疾病的发生^[1]。lncRNA-牛磺酸上调基因1(taurine upregulated gene 1, TUG1)被认为与人类疾病进展密切^[2]。此外,过表达lncRNA-TUG1是心血管疾病后心脏预后不良的生物标志物[3]。竞争性内源RNA(completing endogenous RNA,ceRNA)主要由lncRNA、环状RNA、     

敲低长链非编码RNA AFAP1-AS1抑制TPC-1甲状腺乳头状癌细胞上皮间质转化及其侵袭和迁移

目的 检测甲状腺乳头状癌组织长链非编码RNA (lncRNA)肌动蛋白丝相关蛋白1反义RNA1(AFAP1-AS1)的表达,敲低TPC-1甲状腺乳头状癌细胞AFAP1-AS1,研究其对TPC-1细胞上皮间质转化(EMT)的影响及相关分子机制.方法 采用实时定量PCR检测60例甲状腺乳头状癌组织lncRNA AFAP1-...     

牛磺酸上调基因1对肿瘤发生发展的调控作用

<正>基因的失调控(异常表达)是肿瘤发生发展的重要原因(诱因)业已被学术界所公认,而在这一过程中非编码RNA(non-coding RNA,ncRNA)起到了极为重要的调控作用~([1-2])。小RNA(small RNA;包括微小RNA,microRNA,miRNA,miR)和长链非编码RNA(long non-coding RNA,lncRNA)均属于ncRNA~([3-4])。     

lncRNA LEF1-AS1通过miR-212-5p影响IL-1β诱导的软骨细胞凋亡及炎性因子分泌

为探讨长链非编码RNA(long non-coding RNA,lncRNA)淋巴增强因子1反义RNA 1(lymphatic enhancer factor 1 antisense RNA 1,LEF1-AS1)靶向miR-212-5p对IL-1β诱导的软骨细胞凋亡和炎性因子分泌的影响，采用qRT-PCR分析骨关节炎(osteoarthritis, OA)患者软骨细胞中LEF1-AS1和miR-212-5p的表达。用10 ng/mL的IL-1β处理人正常软骨细胞建立体外OA细胞模型。运用FACS分析软骨细胞凋亡率；ELISA检测培养上清液中IL-6、TNF-α、IFN-γ水平；qRT-PCR检测LEF1-AS1和miR-212-5p表达水平。同时，将LEF1-AS1小干扰RNA、miR-212-5p模拟物转染软骨细胞，并检测抑制LEF1-AS1或过表达miR-212-5p对IL-1β诱导的软骨细胞凋亡及炎性因子分泌的影响。qRT-PCR和双荧光素酶报告基因试验分析LEF1-AS1与miR-212-5p的靶向关系。结果显示，IL-1β处理显著增加软骨细胞的凋亡率(P<0.05),...     

LncRNA FEZF1-AS1通过调控EZH2对肺间质细胞增殖、迁移及侵袭的作用

目的 研究长链非编码RNA FEZ家族锌指1-反义RNA 1(lncRNA FEZF1-AS1)调控zeste同源物增强子2(EZH2)对肺间质细胞增殖、迁移、侵袭能力及上皮细胞-间质转化(EMT)的影响及其作用机制。方法 将人肺腺癌细胞系A549分为对照组(control)和模型组[model,用转化生长因子β1(TGF-β1) 20 ng/mL作用48 h,诱导成为肺间质细胞]。用Western blot检测细胞中E-钙黏蛋白(E-cadherin)、N-钙黏蛋白(N-cadherin)及波形蛋白(vimentin)的蛋白表达。RT-qPCR检测细胞中lncRNA FEZF1-AS1和EZH2基因表达。转染组细胞分为转染si NC组、si lncRNA FEZF1-AS1+OE vector组和si lncRNA FEZF1-AS1+OE EZH2组。CCK-8法检测细胞增殖、细胞划痕检测细胞迁移、Transwell小室法检测细胞侵袭;用Western blot检测细胞中E-cadherin、N-cadherin、vimentin及EZH2的蛋白表达,用RNA免疫沉淀(RIP)测定...     

骨关节炎诱导软骨细胞凋亡和细胞外基质降解的机制

背景:研究发现长链非编码RNA IFNG-AS1在类风湿关节炎中发挥调控作用,但是其在骨关节炎中的作用仍不明确.目的:探究长链非编码RNA IFNG-AS1调控miR-376b-3p/AKT丝氨酸/苏氨酸激酶3(AKT serine/threonine kinase 3,AKT3)轴对骨关节炎软骨细胞增殖、凋亡和细胞外...     

lncRNA-CCAT1与消化道肿瘤关系的研究进展

结肠癌相关转录因子1(CCAT1)是结直肠癌组织中新近发现的一种异常高表达的长链非编码RNA(lncRNA),具有促进肿瘤细胞增殖及侵袭转移等作用。CCAT1通过内源竞争等机制与微小RNA(miRNA)或蛋白相互作用参与调控机体的诸多生理病理过程,尤其是消化道肿瘤的形成与发展,它有望成为有价值的肿瘤标志物和治疗靶点。     

蝎素组分Ⅲ对THP1细胞HMGB1表达的影响

目的:研究蝎素组分Ⅲ(Scorpion venom crudeⅢ,SVC-Ⅲ)对THP1细胞HMGB1表达的影响,探讨蝎素与HMGB1相互作用的机制。方法:不同浓度SVC-Ⅲ(0.1、1.0、10和100 ng/ml)刺激培养THP1细胞48小时后,RT-PCR检测HMGB1 RNA水平表达差异;Western blot检测HMGB1蛋白水平表达情况;激光共聚焦检测HMGB1在细胞中的分布情况。结果:1.0 ng/ml SVC-Ⅲ刺激培养THP1细胞,HMGB1 RNA及蛋白表达水平升高最显著,随着SVC-Ⅲ浓度的增加,HMGB1 RNA及蛋白的表达水平反而下降;SVC-Ⅲ刺激培养THP1细胞可引起HMGB1从胞核转移入胞浆。结论:SVC-Ⅲ可以刺激或抑制THP1细胞HMGB1的表达,其作用效果与剂量密切相关。     

HOXA转录本反义RNA1在胶质母细胞瘤发生发展中的作用研究进展

长链非编码RNAs(LncRNAs)已经成为研究肿瘤机制的热门分子,在许多的肿瘤中起着关键作用.而HOXA转录本反义RNA 1(LncRNA HOTAIRM1)作为LncRNAs的一种,在多种肿瘤发生发展中都发挥一定的作用.本文通过查阅文献以及对比其他肿瘤,介绍LncRNA HOTAIRM1在胶质母细胞瘤(GBM)增殖...     

Comprehensive sequence analysis of HLA-DQA1 and -DQB1 alleles and characterization of DRB1-QAP-DQA1-DQB1 haplotypes

It is well known that both chain and β chain of HLA-DQ are highly polymorphic. However the polymorphisms outside the hypervariable region were not fully examined so far. To further clarify the polymorphisms in DQ genes, we determined the nucleotide sequences of full length cDNA, spanning from the leader sequence to the stop codon, from 15 DQA1 alleles and 15 DQB1 alleles. We identified several new DQ alleles which had identical exon 2 sequence and were different in other exons. On the basis of the sequence analyses, a comprehensive PCR-based oligotyping system for DQA1 gene was established. We then characterized DRB1-QAP(DQA1 promoter)-DQA1-DQB1 haplotypes of B-lymphoblastoid cell lines homozygous for HLA and healthy unrelated Japanese and Norwegian populations. It was revealed that DQA1 alleles, which were identical in exon 2 but different in other exons, showed close linkage disequilibrium with diferent characteristic DRB1, QAP and DQB1 alleles. These results suggest that DR-DQ haplotypes have been generated in the early stage of molecular evolution.     

Initial Changes of Rat Leukemia Induced by 1-Ethyl-1-Nitrosourea and 1-Butyl-1-Nitrosourea

The initial histological changes of leukemia were investigated in rats to which 1-ethyl- 1-nitrosourea and 1 butyl 1 nitrosourea were orally administered. The appearance of orthochromatic erythroblasts in the peripheral blood was used as the index of the initial stage of leukemia. The rat leukemia progressed from solitary lesions to scattered and further diffuse lesions. These leukemias are thought to begin as one, or only a few nodular foci, mainly in the bone marrow and partly in the spleen. Acta Pathol Jpn 42: 158–165, 1992.     

Initial changes of rat leukemia induced by 1-ethyl-1-nitrosourea and 1-butyl-1-nitrosourea.

The initial histological changes of leukemia were investigated in rats to which 1-ethyl-1-nitrosourea and 1-butyl-1-nitrosourea were orally administered. The appearance of orthochromatic erythroblasts in the peripheral blood was used as the index of the initial stage of leukemia. The rat leukemia progressed from solitary lesions to scattered and further diffuse lesions. These leukemias are thought to begin as one, or only a few nodular foci, mainly in the bone marrow and partly in the spleen.     

FoxO1 基因对Jurkat 细胞FoxO1-KLF2-S1P1 通路的调节作用

目的:通过构建FoxO1 表达和干扰慢病毒载体,建立细胞内FoxO1-KLF2-S1P1 信号通路调控研究模型,观察FoxO1 过表达、干扰表达在Jurkat 细胞内对其下游分子表达及功能的影响。方法:构建FoxO1 表达和干扰表达慢病毒载体,分别感染Jurkat 细胞,采用荧光定量PCR、Western blot 和流式细胞术检测S1P1、CD62L、CCR7、CD69 mRNA 水平和蛋白分子的表达。结果:FoxO1 过表达组于感染后120 h FoxO1、KLF2、S1P1 和CD62L mRNA 水平显著增高(P<0.05),FoxO1、FoxO1-p 和KLF2 胞浆蛋白水平增高,S1P1+细胞和CD62L+ 细胞比率增高(P<0.05),CCR7+ 细胞和CD69+ 细胞未见显著改变(P>0.05)。FoxO1 干扰组于转染后120 h FoxO1、KLF2、S1P1 和CD62L mRNA 水平降低(P<0.05),FoxO1、FoxO1-p 和KLF2 胞浆蛋白水平低于对照组,S1P1+细胞百分比增多(P<0.05) ,但S1P1+细胞和CD62L+细胞在72 h 时减少(P<0.05)。结论:FoxO1 表达和干扰慢病毒载体转染Jurkat 细胞并调节KLF2、S1P1 和CD62L 等分子的表达,为开展细胞内FoxO1-KLF2-S1P1 信号通路调控和细胞相关功能的研究打下了基础。     

韩国人CYP450 1A1、CYP450 2E1和GSTM1、GSTT1、GSTP1基因座遗传多态性分析

目的 调查代谢相关的CYP4501A1、CYP4502E1和GSTM1、GSIT1、GSTP1基因座在韩国人群中的遗传多态性分布状况。方法 采用多重聚合酶链式反应、聚合酶链式反应-限制性片段长度多态性技术，分析300名韩国健康大学生的CYP1A1基因3′端限制性内切酶Msp Ⅰ位点、CYP2E1基因5′端转录调节区Pst Ⅰ位点和GSTM1、GSTT1缺失与存在、GSTP1基因第5外显子BsmA Ⅰ位点的基因型，计算基因型和基因频率。结果 CYP1A1基因型频率为ml／ml型39．7％、ml／m2型49．7％、m2／m2型10．7％，基因频率为ml 0．645、m2 0．355。CYP2E1基因型频率为cl／cl型66．7％、cl／c2型30％、c2／c2型3．3％，基因频率为C1 0．818、C2 0．182。GSTM1基因缺失型频率为53．3％。GSTT1基因缺失型频率为54．7％。GSTP1基因型频率为Ile／Ile型62％、Ile／Val型34．3％、VaL／Val型3．7％，基因频率为Ile 0．792、Val 0．208。基因分布符合Hardy-Weirtberg平衡定律。结论 韩国人CYP1A1、CYP2E1、GSTM1、GSTT1基因分布与我国人群较为相近，半数以上人缺乏GSTM1和GSTT1基因，纯合缺失型频率超过印度人的3倍。     

Differential regulation of CYP1A1 and CYP1B1 expression in resveratrol-treated human medulloblastoma cells

Resveratrol induces differentiation and Fas-independent apoptosis of medulloblastoma cells by a largely unknown mechanism. CYP1A1 and 1B1 are involved in resveratrol-mediated tumor suppression but their expression in medulloblastoma cells and their relevance to anti-medulloblastoma activity of resveratrol have not been described. The statuses of CYP1A1 and 1B1 in UW228-3 medulloblastoma cells without and with resveratrol treatments were elucidated in this study with ethoxyresorufin O-deethylation assay, followed by RT-PCR, immunocytochemical staining and Western blot hybridization. CYP1A1/1B1 enzymatic activity was low in UW228-3 cells but became several folds higher upon resveratrol treatments. CYP1A1 was undetectable and CYP1B1 was expressed in normally cultured cells. Accompanied by the increased fraction of apoptosis, enhanced CYP1A1 and downregulated CYP1B1 were observed in resveratrol-treated cells in time- and dose-related fashions. Our results demonstrate for the first time that in the medulloblastoma cell system, CYP1A1 upregulation is paralleled with resveratrol-induced differentiation and apoptosis, while CYP1B1 may not be an essential element in metabolic activation of resveratrol in those cells. CYP1A1 and 1B1 are resveratrol response genes and potential chemosensitive markers of medulloblastoma cells.