Pituitary tumor transforming gene PTTG2 induces psoriasis by regulating vimentin and E-cadherin expression

Psoriasis is a common and intractable skin disease affecting the physical and mental health of patients. This study focused on the roles of pituitary tumor transforming gene 2 (PTTG2) in psoriasis. Using real-time quantitative PCR and western blot, the expression patterns of PTTG2 were compared in psoriatic epidermis cells and normal cells, from both mRNA levels and protein levels. Knockdown of PTTG2 by siRNA was conducted in HaCaT cells to investigate the changes in cell viability and migration in vitro. Expression changes of vimentin and E-cadherin were also detected in the transfected cells. Results showed PTTG2 was significantly overexpressed in the psoriatic epidermis cells (P < 0.05). The cell viability and migration were inhibited by the knockdown of PTTG2. Besides, knockdown of PTTG2 resulted in down-regulation of vimentin and up-regulation of E-cadherin, with significant differences compared to the siRNA control group (P < 0.05). This study indicated the involvement of PTTG2 in mediating epidermis cell viability and migration and in pathogenesis of psoriasis. PTTG2 might be a potential therapeutic target for psoriasis through inducing epithelial-to-mesenchymal transition (EMT) via regulating the expression of vimentin and E-cadherin.     

PTTG和血管生成与结直肠癌的相关性研究

目的研究垂体肿瘤转化基因(PTTG)和血管生成与结直肠癌生物学行为的关系,探讨PTTG的表达与结直肠癌新生血管的关系。方法应用免疫组织化学法,检测120例结直肠癌、30例正常结直肠黏膜中PTTG的表达情况,并测定这些组织中微血管密度(MVD),结合临床病理学指标进行统计学分析。结果 PTTG在结直肠癌患者中阳性表达率为84.17%,其阳性表达率显著高于对照组的6.67%(P0.01);其表达水平与患者Dukes分期及淋巴结转移有关(P0.05)。结直肠癌组织中MVD计数平均为34.75±5.15,显著高于对照组19.10±2.77(P0.01);并与结直肠癌的Dukes分期、有无淋巴结转移有关(P0.05)。PTTG表达阳性病例,其MVD计数普遍高于表达阴性病例;在表达阳性病例中,MVD计数又与其阳性表达强度有关(P0.05)。结论 PTTG表达及微血管密度与结直肠癌生物学特性关系密切;PTTG表达可能促进了结直肠癌肿瘤血管生成;联合检测PTTG和MVD可作为结直肠癌恶性程度及预后指标;抑制PTTG活性有可能为结直肠癌防治开辟新的前景。     

基于TCGA、THPA、GEO数据库挖掘PTTG1在乳腺癌中的表达及预后意义

目的:通过对癌症基因组图谱(The Cancer Genome Atlas,TCGA)、人类蛋白组图谱(The Human Protein Atlas,THPA)和人类肿瘤相关的基因表达汇编(Gene Expression Omnibus,GEO)数据库的数据挖掘,探索垂体肿瘤转化基因1（pituitary tumor-transforming gene 1,PTTG1）在乳腺癌中的表达及预后意义。方法:从TCGA、THPA和GEO数据库提取PTTG1在乳腺癌及正常组织中mRNA和蛋白水平的变化和患者临床病理资料,GEO在线预后分析数据库Kaplan-Meier Plotter(http://kmplot.com)检索PTTG1乳腺癌预后的相关性。结果:在数据库中,PTTG1 mRNA和蛋白水平在乳腺癌队列中表达显著高于正常乳腺组织(P<0.01);PTTG1 mRNA在不同的分子亚型中表达存在显著差异(P<0.05);PTTG1 mRNA在ER和PR阳性乳腺癌患者组织中表达显著低于ER和PR阴性乳腺癌患者(P<0.05);PTTG1 mRNA在进展期乳腺癌患者组织中表达显著高于早期乳腺癌患者(P<0.05);PTTG1 mRNA随着乳腺癌患者组织学分级程度升高而降低(P<0.05)。PTTG1低表达乳腺癌患者的预后显著好于其高表达患者(P<0.001);PTTG1高表达的ER和PR阳性、HER-2阴性乳腺癌患者的预后均显著差于其低表达者(P<0.05)。PTTG1高表达乳腺癌样本富集到细胞因子受体相互作用、趋化因子信号通路、细胞周期、自然杀伤细胞介导细胞毒性、Toll样受体信号通路和T细胞受体信号通路等相关基因集。结论:PTTG1 mRNA和蛋白在乳腺癌组织中高表达,PTTG1 mRNA表达与乳腺癌预后相关且在不同分子分型的乳腺癌中具有不同的预后监测意义,可以作为乳腺癌预后判断的标志物。     

Pituitary tumor transforming gene induces epithelial to mesenchymal transition by regulation of Twist, Snail, Slug, and E-cadherin

Pituitary tumor-transforming gene (PTTG) is an oncogene with its expression levels correlating with tumor development and metastasis. Epithelial to mesenchymal transition (EMT) is a crucial step in tumor progression and metastasis. Using ovarian epithelial tumor cell line (A2780) for loss-of-function or gain-of-function of PTTG in our experiments, we observed up regulation of TGF-β, Twist, Snail, Slug, vimentin and down regulation of E-cadherin on infection of cells with Ad-PTTG cDNA. In contrast reverse phenomena was observed on depletion of PTTG on infection of cells with Ad-PTTG siRNA, suggesting an important role of PTTG in induction of EMT in ovarian cancer cells.     

RNAi技术干扰人喉癌Hep-2细胞PTTG1基因的初步研究

目的:探索对人PTTG1基因mRNA序列有较高干扰效率的位点,构建对PTTG1基因的表达有较高抑制效率的重组质粒。方法:筛选、合成1对互补DNA单链,退火为双链后与双酶切后的质粒载体连接,构建了表达短发夹RNA的1种重组质粒plk0.1-puro/PTTG1。重组质粒以不同浓度转染,并于转染后不同时间收集细胞,以β-actin为内参,采用RT-PCR和Western blot技术分别检测PTTG1基因的mRNA、蛋白质的相对表达水平。结果:与空白对照组相比,6孔板中每孔转染质粒plk0.1-puro/PTTG 11000ng以上、转染超过12d时,PTTG1基因mRNA、蛋白质的相对表达水平下降70%以上。结论:重组质粒plk0.1-puro/PTTG1,在6孔细胞培养板中以1000ng/孔转染12d以上时,有效抑制了人PTTG1基因的表达,在关于PTTG1基因的研究中具有较好的应用价值。     

In silico repurposing the Rac1 inhibitor NSC23766 for treating PTTG1-high expressing clear cell renal carcinoma

The pituitary tumor-transforming gene 1 (PTTG1), also known as Securin, is considered an oncogene. This study aimed to investigate the role of PTTG1 in clear cell renal cell carcinoma (ccRCC) using in silico bioinformatics approaches. A pan-cancer analysis using The Cancer Genome Atlas (TCGA) data indicated that among all cancer types copy number amplification of PTTG1 gene was most frequently found in ccRCC. However, amplification of PTTG1 gene copy number did not correlate with the increase of mRNA level in ccRCC, and did not predict the patients' overall survival. Instead, ccRCC was correlated with overexpression of PTTG1 mRNA, and its expression level was stage-dependent increased in cancer patients. An outlier analysis using the Oncomine database suggested that PTTG1 mRNA expression served as a good biomarker for ccRCC. Pathway analysis for upregulated genes enriched in PTTG1-high expressing ccRCC patients found that PTTG1 overexpression was associated with mitotic defects. Mining drug sensitivity data using the Cancer Therapeutics Response Portal (CTRP) discovered that PTTG1-high expressing ccRCC cell lines were susceptible to a Rac1 (Ras-related C3 botulinum toxin substrate 1) inhibitor NSC23766. Therefore, this study provides an in silico insight into the role of PTTG1 in ccRCC, and repurposes the Rac1 inhibitor NSC23766 for treating PTTG1-high expressing ccRCC.     

LINC00205 promotes proliferation,migration and invasion of HCC cells by targeting miR-122-5p

Long non-coding RNAs (lncRNAs) have been identified as crucial regulators in the tumorigenesis and progression of hepatocellular carcinoma (HCC). Recently, long intergenic non-protein coding RNA 205 (LINC00205) has been identified as a prognostic biomarker in HCC. However, the biological role of LINC0205 and its potential molecular mechanism are poorly investigated. Here, we found that the expression of LINC00205 was dramatically up-regulated in HCC tissues compared to adjacent nontumor tissues. Furthermore, the level of LINC00205 in both Hep3B and Huh7 cells was prominently higher than that in normal hepatic cell line LO2. Notably, the high expression of LINC00205 was strongly correlated with tumor size ≥5 cm, venous infiltration and advanced tumor stages. Functionally, LINC00205 knockdown obviously repressed the proliferation, migration and invasion of Hep3B and Huh7 cells in vitro. An inverse correlation between LINC00205 and miR-122-5p was detected in HCC tissues. Interestingly, LINC00205 knockdown increased the level of miR-122-5p in both Hep3B and Huh7 cells. Mechanistically, luciferase reporter assay demonstrated LINC00205 acted as a competing endogenous RNA (ceRNA) by directly interacting with miR-122-5p. More importantly, miR-122-5p overexpression significantly restrained the proliferation, migration and invasion of HCC cells. Collectively, our study provides solid evidence to support the oncogenic role of LINC00205 in HCC, which may be benefit for the improvement of HCC therapy.     

PTTG表达与垂体腺瘤侵袭性关系

目的 探讨垂体瘤转化基因(Pituitary tumor transforming gene，PTTG)表达与腺瘤侵袭性的关系及其临床意义。方法 回顾近年我科经手术切除的44例垂体腺瘤标本及6例正常垂体组织，均经10％的福尔马林固定、石蜡包埋。联合运用Knosp影像学标准及任祖渊标准，参考术中情况，将肿瘤标本分为侵袭组与非侵袭组；运用免疫组化的方法检测这50例标本中PTTG蛋白表达情况；分析PTTG表达与垂体腺瘤侵袭性的内在关系。结果 免疫组化实验结果显示PTTG蛋白在侵袭性垂体腺瘤组中显著高表达，在非侵袭性腺瘤组中有一定表达，在正常垂体组织中未见表达。结论 原癌基因PTTG表达水平和垂体腺瘤侵袭性密切相关，可作为腺瘤侵袭性的标志物。     

基因PTTG、PTEN在泌乳素腺瘤中的表达及意义

目的:研究泌乳素(PRL)腺瘤中垂体瘤转化基因(PTTG)和抑癌基因PTEN在泌乳素腺瘤中的表达及意义。方法:52例泌乳素腺瘤分为侵袭组24例和非侵袭组28例,采用免疫组化方法分别检测腺瘤组织中PTTG蛋白和PTEN蛋白的表达水平;应用逆转录聚合酶链反应(RT-PCR)检测腺瘤组织中PTTG-mRNA的表达水平;应用免疫印迹(Western-blot)方法检测腺瘤组织中PTTG蛋白的表达水平并进行定量分析。结果:PTTG蛋白在侵袭组中有23例阳性表达,积分光密度(IOD)为9874.24±2143.56,平均吸光度为28.13±4.31,显著高于非侵袭组;RT-PCR检测显示,48例腺瘤标本有PTTG-mRNA特异扩增条带,但侵袭组表达水平有不同程度的增高;PTEN蛋白在非侵袭组中有8例阳性表达,IOD为6489.12±1523.45,与侵袭组比较差异有统计学意义。结论:基因PTTG与PTEN表达与肿瘤的侵袭性密切相关,对肿瘤的发生、发展有重要作用,可以作为临床判定肿瘤侵袭生长的分子标志。     

垂体肿瘤转化基因、内皮抑素和碱性成纤维细胞生长因子mRNA在侵袭性垂体腺瘤中的表达

目的:探讨垂体腺瘤组织中垂体肿瘤转化基因(PTTG)、内皮抑素(endostatin)和碱性成纤维细胞生长因子(bFGF)在侵袭性垂体腺瘤发生中的作用。方法:应用逆转录聚合酶链式反应（RT-PCR）技术检测非侵袭性和侵袭性垂体腺瘤组织标本中PTTG,endostatin和bFGF mRNA的表达水平。结果:侵袭性腺瘤较非侵袭性腺瘤PTTG和bFGF mRNA表达明显增高 (均P< 0.01)。侵袭性腺瘤较非侵袭性腺瘤endostatin mRNA表达明显降低(P<0.01)。结论：垂体腺瘤侵袭性的发生可能与PTTG和bFGF表达增高及endostatin表达下调有关,其作用机制可能与PTTG高表达后改变了肿瘤血管的生成与抑制之间的平衡有关。