银屑病患者皮肤组织信号转导和转录激活因子3基因的表达及其意义

目的:检测寻常型银屑病患者皮损区及非皮损区信号转导和转录激活因子3(STAT3)m RNA的表达差异,并探讨其与银屑病皮损发生的关系。方法:采用实时定量PCR方法检测13例寻常型银屑病患者皮损区和非皮损区组织中STAT3基因的m RNA表达水平,并用免疫组织化学方法同时检测两种磷酸化STAT3蛋白在皮损区、非皮损区的表达,比较其差异。结果:寻常型银屑病患者皮损区STAT3基因的m RNA表达水平明显高于非皮损区(P值为0.0001)。两种磷酸化STAT3蛋白均主要表达在角质形成细胞的细胞核,皮损区的表达水平均明显高于非皮损区(P均0.05),且均可见在真皮浅层血管内皮细胞、淋巴细胞中的表达。结论:STAT3基因在银屑病皮损的角质形成细胞中的m RNA表达显著上调,两种磷酸化STAT3蛋白在皮损区的表达水平均高于非皮损区,提示其参与了银屑病的病理生理过程。     

CVB对OL细胞和OL/BDV细胞I型IFN信号转导途径的影响

探讨柯萨奇病毒(coxsackievirus, CVB)对人类少突胶质细胞(oligodendrocyte, OL)和博尔纳病病毒(Borna disease virus, BDV)持续感染的OL细胞(OL/BDV)中I型干扰素(interferon, IFN)、microRNA-155(miR-155)表达以及干扰素调节因子(interferon regulatory factor, IRF)7细胞定位的影响。CVB感染OL细胞和OL/BDV细胞0、2、4、6、12和24 h,qPCR检测I型IFN mRNA和miR-155表达水平。OL细胞和OL/BDV细胞分别转染IRF7-EGFP质粒,CVB感染4 h,观察IRF7细胞定位情况。CVB感染OL细胞2、4、12和24 h,IFN-αmRNA和miR-155表达水平显著增加,IFN-βmRNA表达水平在4、12和24 h显著增加;CVB感染OL/BDV细胞IFN-α和IFN-βmRNA表达水平除0 h均显著增加,但miR-155表达仅在12和24 h显著增加。CVB感染OL细胞和OL/BDV细胞4 h,IRF7绿色荧光蛋白由细胞浆转移至细胞核内。综上所述,CVB可诱导OL细胞和OL/BDV细胞I型IFN、miR-155的表达,促进IRF7入核,从而激活I型IFN信号转导途径。     

CyclinD1在鲍温病中的表达

目的:探讨cyclinD1(细胞周期蛋白D1)在鲍温病皮肤组织中的表达及其临床意义。方法:采用免疫组化S-P法观察16例鲍温病标本中cyclinD1的表达模式。结果:正常人皮肤组织中,cyclinD1阳性细胞主要分布在基底层及毛囊漏斗部的基底层细胞上。在16例鲍温病标本中14例细胞核内cyclinD1过度表达,阳性细胞分布于肿瘤组织。结论:cyclinD1的异常表达可能与鲍温病的发生相关。     

miR-133b与miR-155在非小细胞肺癌患者肿瘤及周围组织中的表达及意义

探讨miR-133b与miR-155在非小细胞肺癌患者肿瘤及周围组织中的表达及意义。选择在湖北科技学院附属第一医院接受治疗的47例非小细胞肺癌患者作为研究对象,收集其肺癌组织和周围正常组织标本,采用Real-time PCR检测miR-133b和miR-155在肿瘤及周围组织中的表达情况,分析其与患者临床和病理特征之间的相关性。结果显示,肿瘤组织中miR-133b相对表达量为221.4±1.013,周围正常组织为605.8±1.001,两者比较差异显著(p0.05);肿瘤组织中miR-155相对表达量为643.2±1.118,周围组织为386.9±1.097,两者比较差异显著(p0.05)。即Real-time PCR检测患者肿瘤组织中的miR-133表达明显低于周围正常组织,miR-155的表达明显高于周围正常组织;miR-133b和miR-155的表达与患者年龄、性别、病理类型无明显相关性;而与临床分期和淋巴结转移情况明显相关(p0.05),其中miR-133b表达水平与淋巴结转移呈明显负相关,miR-155表达水平与淋巴结转移呈明显正相关;miR-133b的表达还与肿瘤分化程度明显相关(p0.05)。综上所述,miR-133b和miR-155的异常表达与非小细胞肺癌的发生和发展密切相关,对二者表达水平进行检测有助于及早发现、筛选和诊断非小细胞癌患者,对患者预后评估具有一定临床价值。     

银屑病皮损中IL—10及IL—12 p35、p40 mRNA表达的研究

探讨IL－10和IL－12在银屑病发病机理中的可能作用,为应用基因治疗银悄病提供理论基础。采用逆转录聚合酶链反应（RT－PCR）技术检测了12例银屑病患者及6例正常皮肤组织中IL－10和IL－12p35、p40mRNA的表达情况。研究结果表明：（1）与正常皮肤组织相比银屑病皮损中IL－10mRNA明显降低（P＜0.01）。（2）IL－12p35 mRNA在银屑病皮损和正常皮肤组织中均呈阳性表达,IL－12p40 mRNA只在银屑病皮损中呈阳性表达,而在正常皮肤中为阴性。推测IL－12在银屑病的发生和发展中可能起重要,而IL-10可能在银屑病消退中起一定作用。     

miR-203a靶向及其靶基因对乳腺癌淋巴结转移的影响*

目的:探讨miR-203a靶向及其靶基因ATM在乳腺癌组织中的表达及相关性,为乳腺癌的发病机制尤其是淋巴结转移机制提供理论依据。方法:收集30例配对的乳腺癌和癌旁正常组织,对两组标本采用RT-qPCR检测miR-203a及ATM的相对表达量,对miR-203a和ATM进行相关分析,并对其与临床病理特征进行相关分析,比较miR-203a和ATM的表达在淋巴结转移和未转移之间是否有统计学差异。结果:与癌旁正常组织相比,乳腺癌组织中miR-203a的表达显著升高(P＜0.01),ATM的表达显著降低(P＜0.01),二者呈显著负相关(r=-0.847,P＜ 0.01);miR-203a和ATM的表达均与淋巴结是否转移与不同临床分期显著相关(P＜0.05);miR-203a在淋巴结已转移组中的表达显著低于未转移组(P＜0.05),ATM在淋巴结已转移组中的表达显著高于未转移组(P＜0.01)。结论:乳腺癌早期miR-203a过表达抑制其靶基因ATM的表达很可能是一种调节肿瘤细胞增殖、转移和侵袭性的保护机制,到中晚期下调miR-203a上调ATM基因,可能参与淋巴结转移。     

角蛋白15在大鼠皮肤发育中表达的研究

目的研究角蛋白15(K15)在大鼠皮肤发育中的表达状况,定位表皮干细胞.方法以不同年龄大鼠背部皮肤为标本,用组织学方法,观察出生后大鼠皮肤的形态发育变化;以K15单克隆抗体为一抗,进行免疫组织化学染色,观察K15在大鼠皮肤中的表达状况.结果(1)组织学方法显示,随着年龄的增长,大鼠背部表皮细胞层数逐渐变少;在毛囊的生长周期中,以隆突区为界,毛囊上段为恒定区,下段呈周期性变化(2)免疫组化染色显示,毛囊隆突区细胞胞浆表达K15,随年龄的增长,K15阳性细胞出现在毛母质细胞区、毛囊外根鞘和表皮基底层.结论表皮干细胞位于毛囊隆突区,与表皮的更新和毛囊的周期性变化有关.     

人体不同解剖部位表皮基底层中CD34蛋白表达及意义

目的探讨人体不同解剖部位表皮基底层中CD34蛋白表达及意义。方法采用组织学观察法、双免疫标记法、流式细胞术检测人包皮、头皮和躯干皮肤来源的组织标本中CD34蛋白表达。结果 CD34蛋白在人包皮和头皮的表皮基底层细胞中有表达,而在人躯干皮肤的表皮中无表达。Ⅰ型表位CD34蛋白的分布比Ⅱ、Ⅲ型表位CD34蛋白更加广泛。CD34阳性的基底层细胞同时也有β1整合素或p63的表达,并随着细胞传代而减少。不同年龄CD34I型表位的阳性表达率均明显高于Ⅱ型和Ⅲ型(P0.05),而不同年龄组的CD34阳性率各表位比较无显著性差异(P0.05)。结论 CD34蛋白主要分布于包皮和头皮的表皮基底层细胞中,可用于包皮和头皮的表皮基底层细胞的分选。     

MiRNA-155通过调控β-catenin促进结肠癌SW480细胞的侵袭

目的:探讨micro RNA-155(miR-155)对结肠癌细胞SW480侵袭能力的影响及其可能机制。方法:采用反转录-聚合酶链反应(RT-PCR)测定结肠癌组织与邻近正常结肠组织中miR-155的表达。将miR-155 mimic和β-catenin特异性的siRNA(β-catenin si RNA)分别通过脂质体转染法转染入结肠癌SW480细胞,应用RT-PCR检测细胞中miR-155和β-catenin m RNA的表达,采用蛋白质印迹法(Western Blot)检测β-catenin蛋白表达,采用Transwell侵袭实验检测miR-155 mimic及β-catenin si RNA对SW480细胞侵袭能力的影响。结果:结肠癌组织中的miR-155的表达较邻近正常结肠组织明显升高(P0.05);miR-155 mimic可使β-catenin的m RNA和蛋白表达均显著升高(P0.05),同时可显著增强SW480细胞的侵袭能力(P0.05),而转染miR-155 mimic和β-catenin si RNA的SW480细胞侵袭能力较仅转染miR-155 mimic的SW480细胞显著减弱(P0.05)。结论:结肠癌组织中miR-155的表达上调,可能通过激活B-catenin信号通路促进肿瘤细胞的远处侵袭转移。     

miR-155靶向SOCS1对骨肉瘤Saos2细胞的增殖、侵袭和迁移能力的影响

目的:探讨microRNA-155(miR-155)对骨肉瘤Saos2细胞增殖、侵袭和迁移的影响以及其作用机制。方法:利用实时荧光定量(qRT-PCR)实验检测miR-155在正常成骨细胞与骨肉瘤Saos2细胞中的表达水平,以及miR-155-mimic、miR-155-inhibitor的转染效率。采用CCK-8实验检测细胞的增殖能力,Transwell实验和划痕实验分别检测Saos2细胞的侵袭和迁移能力,Western blot检测细胞内的STAT3磷酸化水平以及SOCS1表达水平,双荧光素酶报告基因实验进行靶基因验证。结果:miR-155在骨肉瘤Saos2细胞中表达明显高于正常成骨细胞(P0.001)。在分别转染miR-155-mimic和miR-155-inhibitor后,Saos2细胞内miR-155表达水平明显上调和下降(P0.001)。过表达miR-155可促进Saos2细胞增殖、侵袭和迁移,降低SOCS1的蛋白水平,上调STAT3的磷酸化水平,差异均具有统计学意义。相反,降低miR-155水平可抑制Saos2细胞的增殖、侵袭和迁移能力,差异均具有统计学意义。结论:骨肉瘤Saos2细胞中高表达的miR-155可以通过抑制SOCS1表达来激活STAT3信号通路进而促进细胞的增殖、侵袭和迁移,因此,靶向抑制miR-155表达可以作为潜在治疗骨肉瘤的途径。     

Diagnostic,prognostic, and therapeutic potency of microRNA 21 in the pathogenesis of colon cancer,current status and prospective

Aberrant microRNA (miR) expression is implicated in multiple human malignancies. miR-21, acting as a proto-oncogene, is involved in a variety of cellular processes and tumorigenesis and is frequently overexpressed in some cancer types. Several tumor suppressors, metastatic, and apoptotic genes have been identified as miR-21 targets, including Ras homolog gene family member B, PTEN, Sprouty2, programmed cell death 4, Integrin-β4, and E-cadherin thereby regulating tumor growth, invasion, and metastasis. There is a growing evidence that miR-21 expression is associated with clinical outcomes in patients with colorectal cancer (CRC). In this review, we summarize the potential diagnostic, prognostic, and therapeutic values of miR-21 in CRC progression for a better understanding and hence a better management of this disease.     

Association between circulating microRNA-126 expression level and tumour necrosis factor alpha in healthy smokers

Introduction: Smoking contributes to the death of a million people worldwide each year. Smokers experience an alteration in tumour necrosis factor-alpha (TNF-α), and the risk of expected lung cancer. The study aimed at investigating the expression levels of mir-126 and mir-124, as well as TNF-α as possible biomarkers of expected smoking-related diseases.

Methods: Twenty-five male smokers’ age and sex-matched with 25 non-smokers were recruited for the present study. Plasma expression levels of mir-126 and mir-124 were evaluated using quantitative real-time PCR. Lipid profile, TNF-α, interleukin-6 and C-reactive protein were assessed in plasma of each participant.

Results: Plasma miR-126 was statistically down-regulated in smokers relative to non-smokers; however, mir-124 did not show any significant changes between groups. Among the measured parameters, mir-126 and tumour necrosis factor alpha (TNF-α) displayed a good discrimination and sensitivity between smokers and non-smokers (AUC = 0.809 (95% CI: 0.668–0.95; p?<?0.001) and 0.742(95% CI: 0.584–0.9; p?<?0.01), respectively. Also, the combined evaluation of miR-126 and TNF-α levels showed high discrimination (AUC= 0.889 (95% CI: 0.779–1.00; p?<?0.0001), sensitivity = 85%, and specificity = 80% in the diagnosis of smokers with non-smokers.

Conclusions: MiR-126 and TNF-α are potential biomarkers of smoking-related diseases and are important in assessing the expected tobacco-related harm.     

MPC30-DEA70载AMO-miR-222对大鼠颈总动脉球囊损伤后血管狭窄的影响

目的:阳离子磷酸胆碱聚合物(MPC30-DEA70)为非病毒类转基因载体,可与AMO-mi R-222络合,通过导管球囊系统将MPC30-DEA70/AMO-mi R-222基因复合物导入大鼠颈内动脉球囊损伤处,观察对血管平滑肌细胞增生及血管狭窄程度的影响。方法:90只雄性SD大鼠随机分为未损伤组、多聚赖氨酸(PLL组)、MPC30-DEA70/AMO-mi R-222组、PLL/AMO-mi R-222组、PLL/MPC30-DEA70组、AMO-mi R-222组、单纯损伤组、PLL载P/A=3:1组和P/A=5:1组,每组各10只。构建大鼠颈总动脉球囊损伤模型,予血管损伤段行PLL、MPC30-DEA70/AMO-mi R-222、PLL/AMO-mi R-222、PLL/MPC30-DEA70、AMO-mi R-222、PLL载P/A=3:1和P/A=5:1复合物的转运。4周后通过光学显微镜观察HE染色血管段组织形态学改变。Western blot法检测各组血管段p57Kip2、p27Kip1蛋白的表达情况。RT-PCR法检测各组血管段mi R222扩增情况。结果:光学显微镜下,多聚赖氨酸(PLL组)、裸MPC30-DEA70/AMO-mi R-222组、PLL/AMO-mi R-222组、PLL/MPC30-DEA70组、AMO-mi R-222组、MPC30-DEA70组可见内膜显著增生,新生内膜/中膜比值无组间差异,较PLL载P/A=3:1组和P/A=5:1组有组间差异,后两组比较无组间差异,未损伤组未见新生内膜增殖。Western blot法检测显示PLL载P/A=3:1组和P/A=5:1组P57kip2、P27kip1蛋白表达含量较未损伤组降低(P0.05),较余六组增高(P0.05),组间比较无显著差异(P0.05)。RT-PCR法检测显示,mi R-222表达在未损伤组很低,PLL载P/A=3:1组和P/A=5:1组增高,余六组过表达(组间比较无显著差异)。结论:MPC30-DEA70可与AMO-mi R-222络合,有效抑制球囊损伤后血管mi R222表达,从而抑制新生内膜增生及血管狭窄。     

Regulation of INSIG2 by microRNA-96

Mature forms of the microRNAs miR-96, -182, and -183 originate from a single genomic locus and have been shown to be elevated approximately 50-fold in the livers of sterol regulatory element-binding protein-1a and -2 (SREBP-1a and -2) transgenic mice. Our study attempted to identify the possible targets of these microRNAs using miRNA target prediction software. This revealed putative sites in insulin-induced genes (INSIGs). The 3′ untranslated region (UTR) of insulin-induced gene 1 (INSIG1) contained sites corresponding to miR-182, and -183, while the 3′ UTR of INSIG2 featured an miR-96 site. Among these putative sites, only miR-96 demonstrated an inhibitory effect that was specific to the 3′ UTR of INSIG2. As INSIG proteins are the main components of SREBP cleavage complexes that act to release active SREBPs, we assessed the effects of miR-96 on INSIG and SREBP levels and activities. We found that miR-96 reduced the levels of INSIG2 in INSIG1 knockout human fibroblasts, resulting in an increase in SREBP-1 and -2 nuclear forms and a subsequent increase in the abundance of the mRNA of their target genes. These results suggest that miR-96, an miRNA induced by SREBP-2 activation, regulates downstream targets of SREBPs and may increase the abundance of active SREBP.     

microRNA-15a模拟物对人关节软骨细胞增殖与凋亡的影响

目的：近年来研究表明,关节软骨细胞凋亡在骨关节炎发病过程中起到了重要的作用,本文旨在探讨microma-15a模拟物对于原代人膝关节软骨细胞增殖与凋亡的影响。方法：取人外伤性截肢后的膝关节软骨,采用双酶消化法分离获得人膝关节软骨细胞,并进行体外培养,通过甲苯胺蓝染色和II型胶原免疫细胞化学染色进行软骨细胞鉴定。将培养的软骨细胞传代后取第l代细胞,分为实验组和对照组,实验组采用mir．15a模拟物（has．mir-15amimics）转染软骨细胞,上调软骨细胞内mir-15a的表达量;对照组分为阴性对照组、空白对照组。采用MTT法测定细胞增殖曲线,流式细胞仪测定细胞凋亡率。结果：原代细胞中细胞呈多角形、圆形与梭型,贴壁生长;甲苯胺蓝染色胞质呈深蓝色,II型胶原染色胞质呈黄褐色,为特异性染色。经统计学分析,实验组与对照组相比增殖速率明显下降（P〈0．05）。实验组凋亡率（7．13％±0．57）与阴性对照组凋亡率（2．66％±0．15）相比明显增高（P〈0．05）。结论：采用双酶消化法成功分离并培养具有生物学特性的原代人膝关节软骨细胞,通过转染mir-15a模拟物外源性增加关节软骨细胞内mir．15a表达量可显著促进其凋亡并抑制其增殖,为阐明骨关节炎发病机制提供了新的理论依据,为’临床治疗提供了新的靶点。     

LncRNA CRNDE promotes the progression and angiogenesis of pancreatic cancer via miR-451a/CDKN2D axis

BackgroundThe lncRNA colorectal neoplasia differentially expressed (lncRNA CRNDE) has been reported to play a pivotal role in various cancers. However, the expression and function of CRNDE in pancreatic cancer remain unclear. The objective of this study was to investigate the effects of CRNDE on pancreatic cancer and the underlying mechanisms.MethodsThe expression of CRNDE in pancreatic cancer tissues and cell lines was determined by RT-qPCR. Proliferation and angiogenesis were detected by MTT, colony formation, transwell and tube formation assays in vitro and in vivo. ELISA assay was used to detect the secretion of VEGFA. IHC was performed to test the expression levels of Ki67 and CD31. The binding sites between CRNDE, CDKN2D and miR-451a were predicted by bioinformatics analysis. Dual luciferase reporter and RNA immunoprecipitation assays were conducted to confirm the interaction with each other.ResultsThe results showed that CRNDE was significantly up-regulated in pancreatic cancer tissues as well as cell lines. CRNDE overexpression promoted the progression and angiogenesis of pancreatic cancer cells in vitro and in vivo. Moreover, we identified that CRNDE functioned as a sponge for miR-451a and CRNDE overexpression inhibited the expression of miR-451a. Furthermore, we confirmed that miR-451a directly interacted with CDKN2D and negatively regulated CDKN2D expression. In addition, CRNDE was found to positively regulate CDKN2D expression and mediate pancreatic cancer cell proliferation and angiogenesis through miR-451a/CDKN2D axis.ConclusionCRNDE modulates cell proliferation and angiogenesis via miR-451a/CDKN2D axis in pancreatic cancer, which provides a potential therapeutic target for pancreatic cancer treatment.     

微小RNAmiR-21和miR-31在13腔鳞癌组织中的表达及意义

目的：检测口腔鳞癌中微小RNA miR-21和miR-31的表达,探讨其与肿瘤发展的关系。方法：应用实时荧光定量PCR的方法检测72例口腔鳞癌,38例正常口腔粘膜miR-21和miR-31的表达,统计学分析其表达与肿瘤临床分期和病理分型的关系。结果：①口腔鳞癌组织与对照组比较,微小RNA miR-21和miR-31的表达都有显著增高（P〈0.05）,其中miR-21的增高更为显著（P〈0.001）。②统计学分析表明,miR-21的表达在晚期鳞癌组织较早中期鳞癌组织增高更为显著（P〈0.01）,在低分化鳞癌组织较中、高分化鳞癌组织增高更为显著（p〈0.001）;MiR-31的表达水平在不同肿瘤临床分期和病理分型鳞癌组织中无明显差异（P〉0.05）。结论：miR-21和miR-31在口腔鳞癌发生发展过程中表达有明显增高,其中miR-21表达水平可作为潜在的口腔鳞癌临床分期分级和预后的指标。     

微小RNA miR-21和miR-31在口腔鳞癌组织中的表达及意义

目的:检测口腔鳞癌中微小RNA miR-21和miR-31的表达,探讨其与肿瘤发展的关系。方法:应用实时荧光定量PCR的方法检测72例口腔鳞癌,38例正常口腔粘膜miR-21和miR-31的表达,统计学分析其表达与肿瘤临床分期和病理分型的关系。结果:①口腔鳞癌组织与对照组比较,微小RNA miR-21和miR-31的表达都有显著增高(P0.05),其中miR-21的增高更为显著(P0.001)。②统计学分析表明,miR-21的表达在晚期鳞癌组织较早中期鳞癌组织增高更为显著(P0.01),在低分化鳞癌组织较中、高分化鳞癌组织增高更为显著(p0.001);MiR-31的表达水平在不同肿瘤临床分期和病理分型鳞癌组织中无明显差异(P0.05)。结论:miR-21和miR-31在口腔鳞癌发生发展过程中表达有明显增高,其中miR-21表达水平可作为潜在的口腔鳞癌临床分期分级和预后的指标。     

Inhibition of mir-21, which is up-regulated during MYCN knockdown-mediated differentiation, does not prevent differentiation of neuroblastoma cells

Background

Neuroblastoma is a malignant childhood tumour arising from precursor cells of the sympathetic nervous system. Genomic amplification of the MYCN oncogene is associated with dismal prognosis. For this group of high-risk tumours, the induction of tumour cell differentiation is part of current treatment protocols. MicroRNAs (miRNAs) are small non-coding RNA molecules that effectively reduce the translation of target mRNAs. MiRNAs play an important role in cell proliferation, apoptosis, differentiation and cancer. In this study, we investigated the role of N-myc on miRNA expression in MYCN-amplified neuroblastoma. We performed a miRNA profiling study on SK-N-BE (2) cells, and determined differentially expressed miRNAs during differentiation initiated by MYCN knockdown, using anti-MYCN short-hairpin RNA (shRNA) technology.

Results

Microarray analyses revealed 23 miRNAs differentially expressed during the MYCN knockdown-mediated neuronal differentiation of MNA neuroblastoma cells. The expression changes were bidirectional, with 11 and 12 miRNAs being up- and down-regulated, respectively. Among the down-regulated miRNAs, we found several members of the mir-17 family of miRNAs. Mir-21, an established oncomir in a variety of cancer types, became strongly up-regulated upon MYCN knockdown and the subsequent differentiation.Neither overexpression of mir-21 in the high-MYCN neuroblastoma cells, nor repression of increased mir-21 levels during MYCN knockdown-mediated differentiation had any significant effects on cell differentiation or proliferation.

Conclusions

We describe a subset of miRNAs that were altered during the N-myc deprived differentiation of MYCN-amplified neuroblastoma cells. In this context, N-myc acts as both an activator and suppressor of miRNA expression. Mir-21 was up-regulated during cell differentiation, but inhibition of mir-21 did not prevent this process. We were unable to establish a role for this miRNA during differentiation and proliferation of the two neuroblastoma cell lines used in this study.