胃腺癌预后评估中Tiam1蛋白过表达的意义

目的探讨T淋巴瘤转移诱导因子1(T-cell lymphoma invasion and metastasis-inducing factor 1,Tiam1)过表达在胃腺癌(gastric adenocarcinoma,GAC)临床预后评估中的意义。方法采用免疫组化En Vision法检测Tiam1蛋白在102例GAC组织、21例胃异型增生组织和33例癌旁正常组织中的表达,并分析其过表达与GAC患者预后之间的关系。结果 GAC组织中Tiam1阳性率为85.3%(87/102),强阳性率为61.8%(63/102),均明显高于胃异型增生组织和癌旁正常组织(P均0.01)。Tiam1蛋白表达水平与GAC分化程度、临床分期、淋巴结转移及浆膜浸润密切相关(P均0.05),与患者性别、年龄及肿块大小等均无关。结论 Tiam1蛋白表达水平与GAC的发生、发展及预后密切相关,Tiam1蛋白过表达可成为GAC患者不良预后的重要指标之一。     

大肠肿瘤中Tiam1的表达及临床意义

目的探讨T淋巴瘤侵袭转移诱导因子1(T lymphom a invasion and m etastasis induc ing factor 1,Tiam1)表达与大肠癌发生、发展和转移的关系。方法应用免疫组化方法检测大肠正常组织、大肠腺瘤、大肠癌和大肠淋巴结转移癌石蜡组织标本中Tiam1蛋白的表达情况。应用RT-PCR和免疫组化方法检测大肠癌细胞株中Tiam1 mRNA和蛋白的表达情况。结果Tiam1蛋白在大肠正常组织、腺瘤、癌及淋巴结转移癌中表达差异有显著性(2χ=23.561,P<0.01);两两比较发现,腺瘤Tiam1表达比大肠正常组织高(Z=-2.423,P<0.05),淋巴结转移癌组织Tiam1表达比大肠癌组织高(Z=-2.051,P<0.05),而大肠癌组织与腺瘤组织Tiam1表达差异无显著性(Z=-0.938,P>0.05)。在大肠癌组织中,伴发转移的大肠癌组织比未发生转移的大肠癌组织Tiam1表达明显增强,差异具有显著性(Z=-3.176,P<0.01)。RT-PCR结果显示Tiam1基因在高转移的LoVo和SW 620中呈高表达,在低转移的LS174T和HT29中呈低或不表达,在SW 480、HCT116等呈中度表达。结论Tiam1表达与大肠癌转移存在密切关系,Tiam1表达可作为大肠癌转移过程中一个有价值的指标。     

Tiam1表达与胃癌侵袭转移关系的临床和实验研究

目的检测T淋巴瘤侵袭转移诱导因子1(Tiam1)在正常胃黏膜组织、胃癌组织以及胃癌细胞系中的表达,探讨其与胃癌侵袭转移的关系。方法(1)应用免疫组化SABC法检测60例胃癌及正常胃黏膜组织中Tiam1蛋白的表达并分析其与胃癌临床病理参数间的关系。(2)应用逆转录PCR和SABC免疫组化技术分别检测Tiam1mRNA与蛋白在胃癌MKN45细胞(MO)及其高(MH)、低(ML)侵袭转移亚株中的表达,分析其与胃癌细胞侵袭转移能力的关系。结果(1)Tiam1蛋白在正常胃黏膜组织中阴性表达显著低于癌组织(0vs78.3%),两者差异有统计学意义(P<0.01),且随胃癌组织分化程度的降低、浸润深度的增加、TNM分期的升高及伴有淋巴结转移,Tiam1蛋白染色阳性率逐渐升高,差异有统计学意义(P<0.05)。但Tiam1蛋白表达水平与胃癌患者的性别、年龄、部位及癌肿大小无关,差异无统计学意义(P>0.05)。(2)Tiam1mRNA和蛋白在胃癌MKN45细胞高侵袭转移亚株中的表达均较其在MKN45细胞及低侵袭转移亚株中的表达为强,差异有统计学意义(P<0.05)。结论Tiam1表达与胃癌侵袭转移能力呈正相关,且其有可能成为反映胃癌恶性生物学行为的一种新型标志物。     

Bmi-1 regulates epithelial-to-mesenchymal transition to promote migration and invasion of breast cancer cells

Breast cancer is a highly invasive and metastatic disease. Recent studies report that breast cancer cells that have undergo epithelial-to-mesenchymal transition (EMT) obtain malignant characteristic, however, the molecular mechanism underlying this transition are poorly understood. Here, we found that over-expression associated with the process of breast cancer and that high B-cell-specific moloney murine leukemia virus insertion site 1 (Bmi-1) levels predict shorter survival of breast cancer patients. We demonstrate that Bmi-1 regulates EMT and the migration of breast cancer cells. RNA interference-mediated knockdown Bmi-1 expression restored E-cadherin expression and cell-cell junction formation in breast cancer cells, suppressing cell migration and invasion. In contrast, the over-expression of Bmi-1 decreased the expression of the epithelial mark (E-cadherin) but increased the mesenchymal makers (N-cadherin and vimentin) in breast cancer cells.     

CRIM1, a newfound cancer-related player,regulates the adhesion and migration of lung cancer cells

Abstract

CRIM1 is a member of the bone morphogenetic protein (BMP) antagonists; however, the role of CRIM1 in controlling cancer cell behavior remains unknown. This study investigated its function in the A549 cell line in vitro. The results show that treating cells with CRIM1 peptide could increase the migration and adhesion of A549. Consistently, silencing the CRIM1 expression decreased the migration and adhesion of A549. Furthermore, the CRIM1 protein expression was increased in A549 which were treated with transforming growth factor beta 1 to induced EMT. However, CRIM1 peptide treatment could increase the expression of N-CAD and E-CAD expression. Finally, overexpression of the oncogene YAP1 resulted in an up-regulation of the CRIM1 expression in A549, suggesting that CRIM1 was a target of the Hippo pathway. These observations provide evidence for the first time that CRIM1 plays a role in cancer cells by enhancing the migration and adhesion and increasing the expression of N-CAD and E-CAD.     

神经调节因子Neuregulin-1(Nrg1)调节U87-MG细胞的黏附分子L1表达及促迁移作用

目的研究神经调节因子Neuregulin-1(Nrg1)对人胶质母细胞瘤U87-MG细胞中细胞黏附分子L1表达及细胞迁移的影响。方法给予U87-MG细胞重组Nrg1α(rNrg1α,2.5 nmol/L)24和48 h,RT-PCR观察L1 mRNA表达;给予细胞rNrg1α或rNrg1β(2.5 nmol/L)48 h,Western blot检测L1蛋白水平。用Nrg1 siRNA处理细胞,Western blot观察L1蛋白水平,用细胞划伤实验观察细胞迁移。结果 Nrg1α可促进L1 mRNA表达;与0 nmol/L组相比,Nrg1α及Nrg1β(2.5 nmol/L)均可显著增加L1蛋白水平(P<0.01,P<0.05)。与对照siRNA相比,Nrg1 siRNA明显降低Nrg1表达,并伴有L1表达下降。Nrg1 siRNA处理细胞划伤16 h,划伤边缘细胞Nrg1α、Nrg1β及L1荧光信号降低,细胞迁移减弱。结论 Nrg1可调节U87-MG细胞L1表达,其参与细胞迁移可能与提高L1表达有关。     

MiR-873-5p inhibits cell migration,invasion and epithelial-mesenchymal transition in colorectal cancer via targeting ZEB1

Recent studies have demonstrated that dysregulation of mircoRNAs (miRNAs) greatly affected biological processes of human cancers, including colorectal cancer. As a member of miRNAs family, miR-873-5p has been proved to be a tumor suppressor in some human cancers. Here, we aim to investigate the effects of miR-873-5p on the migration, invasion and epithelial-mesenchymal transition (EMT) of colorectal cancer cells. The low expression of miR-873-5p in colorectal cancer cells was identified by conducting qRT-PCR analysis. Gain of function assays were designed and conducted to demonstrate the specific function of miR-873-5p overexpression in colorectal cancer progression. Transwell assay and western blot assay were conducted and revealed that miR-873-5p inhibited cell migration, invasion and EMT formation. To find the downstream molecular mechanism of miR-873-5p, mechanism assays were designed and performed to find the downstream target of miR-873-5p. ZEB1 (Zinc finger E-box-binding homeobox 1) was certified to be the target of miR-873-5p through bioinformatics analysis, luciferase activity assay and pull-down assay. Finally, rescue assays were carried out to demonstrate the effects of miR-873-5p-ZEB1 axis on the migration, invasion and EMT process of colorectal cancer cells. In conclusion, we confirmed that miR-873-5p suppressed cell migration, invasion and EMT in colorectal cancer via targeting ZEB1.     

Peroxiredoxin 1 promoted tumor metastasis and angiogenesis in colorectal cancer

Peroxiredoxin1 (Prdx1) is a member of the PrdxS family, and it regulates cellular signaling and differentiation. The role of Prdx1in colorectal cancer (CRC) remains unclear. In this study, we investigated the relevance of Prdx1 in the metastasis and angiogenesis of CRC. The expression of Prdx1 in 60 cases human CRC tissues was detected through immunohistochemistry. The tumors that highly expressed Prdx1 (42/60) exhibited higher tumor grade and lymph node metastasis than those with low expression of Prdx1 (18/60) (p?<?0.05). Kaplan–Meier survival analysis showed that the survival time of thePrdx1-positive group was shorter than that of thePrdx1-negative group (p?=?0.046).Moreover, a statistically significant correlation was observed between the Prdx1 expression and microvessel density (p?=?0.004). Transwell migration assay revealed that Prdx1 was down-regulated in the CRC cell line HCT116, thereby suppressing the invasion and migration capacities of tumor cells, whereas Prdx1was up-regulated in HT29 cells, thereby increasing the invasion and migration capacities of tumor cells. The tube formation capacity of human umbilical vein endothelial cells cultured in 3D medium was increased after conditioned medium from overexpressed Prdx1cancer cells was added relative to that when down-regulated Prdx1 cell medium was added (p?<?0.05). In addition, up-regulated Prdx1 increased the protein expression of MMP2, MMP9, and VEGFA. These data suggested that Prdx1 expression predicted poor prognosis by regulating the tumor metastasis and angiogenesis of CRC. Therefore, Prdx1 may serve as a potential therapeutic target.     

Sialomucin CD43 regulates T helper type 17 cell intercellular adhesion molecule 1 dependent adhesion,apical migration and transendothelial migration

T helper type 17 lymphocytes (Th17 cells) infiltrate the central nervous system (CNS), induce inflammation and demyelination and play a pivotal role in the pathogenesis of multiple sclerosis. Sialomucin CD43 is highly expressed in Th17 cells and mediates adhesion to endothelial selectin (E-selectin), an initiating step in Th17 cell recruitment to sites of inflammation. CD43^−/− mice have impaired Th17 cell recruitment to the CNS and are protected from experimental autoimmune encephalomyelitis (EAE), the mouse model of multiple sclerosis. However, E-selectin is dispensable for the development of EAE, in contrast to intercellular and vascular cell adhesion molecules (ICAM-1 and VCAM-1). We report that CD43^−/− mice have decreased demyelination and T-cell infiltration, but similar up-regulation of ICAM-1 and VCAM-1 in the spinal cord, compared with wild-type (WT) mice, at the initiation of EAE. CD43^−/− Th17 cells have impaired adhesion to ICAM-1 under flow conditions in vitro, despite having similar expression of LFA-1, the main T-cell ligand for ICAM-1, as WT Th17 cells. Regardless of the route of integrin activation, CD43^−/− Th17 cell firm arrest on ICAM-1 was comparable to that of WT Th17 cells, but CD43^−/− Th17 cells failed to optimally apically migrate on immobilized ICAM-1-coated coverslips and endothelial cells, and to transmigrate under shear flow conditions in an ICAM-1-dependent manner. Collectively, these findings unveil novel roles for CD43, facilitating adhesion of Th17 cells to ICAM-1 and modulating apical and transendothelial migration, as mechanisms potentially responsible for Th17 cell recruitment to sites of inflammation such as the CNS.     

Understanding metastatic SCCHN cells from unique genotypes to phenotypes with the aid of an animal model and DNA microarray analysis

Metastasis of squamous cell carcinoma of the head and neck (SCCHN) is a significant health-care problem worldwide. The 5-year survival rate is less than 50% for patients with lymph node metastases. Understanding the molecular basis of SCCHN metastasis would facilitate the development of new therapeutic approaches to the disease. To identify proteins that mediate SCCHN metastasis, we established a SCCHN xenograft mouse model and performed in vivo selection from a SCCHN cell line using the model. In the fourth round of in vivo selection, significant incidences of metastases in lymph nodes (7/10) and lungs (6/10) were achieved from a derived SCCHN cell line as compared with its parental cells, 1/5 in lymph nodes and 0/5 in lungs. Metastatic cell lines from lymph node metastases and parental cell lines from non-metastatic xenograft tumors were subjected to DNA microarray analysis using an Affymetrix gene chip HG-U133A, followed by data mining studies. The identified metastasis-related genes were further evaluated for their encoding protein products and the metastatic cells were examined by biological analyses. DNA microarray analysis highlighted molecular features of the metastatic SCCHN cells, including alteration of expression of cell–cell adhesion proteins, epithelial cell markers, apoptosis and cell cycle regulatory molecules. Further biological analyses of phenotypic alterations revealed that the metastatic cells gained epithelial-mesenchymal transition (EMT) features and were more resistant to anoikis, which are two of the important phenotypes for metastatic SCCHN.     

过表达细胞黏附分子1抑制卵巢癌细胞迁移及侵袭

目的:研究过表达细胞黏附分子1(cell adhesion molecule 1,CADM1)对卵巢癌增殖、迁移和侵袭的影响.方法:qRT-PCR测定CADM1mRNA在卵巢癌细胞系SKOV3及人正常卵巢上皮细胞hose中的表达,将SKOV3细胞分成两组,即CADM1过表达组和对照组,转染48 h后Western印迹测定两组CADM1蛋白表达量,采用lipofectamine 2000分别转染pcDNA3.1-CADM1及pcDNA3.1质粒,采用CCK-8、克隆形成、细胞划痕及Transwell实验分别检测两组细胞增殖、克隆形成、细胞迁移及侵袭能力.结果:CADM1mRNA在SKOV3中表达水平显著低于hose细胞系(1.54±0.34 vs.5.63±0.96,p＜0.05);转染48 h后,CADM1过表达组和对照组CADM1蛋白表达量分别为2.53±0.42,0.37±0.09,差异具有统计学意义(P＜0.05).CADM1过表达组和对照组在0,24,48,72 h 450 nm处的OD值差异无统计学意义(P＞0.05);CADM1过表达组与对照组克隆形成数相比(60.4±7.6 vs.58.3±8.2),差异无统计学意义(P＞0.05);CADM1过表达组细胞迁移率显著低于对照组(20.3％±3.5％vs.60.1％±4.2％,P＜0.05);CADM1过表达组侵袭细胞数显著少于对照组(24.5±5.3 vs.65.1±6.9,P＜0.05).结论:CADM1在卵巢癌细胞系中低表达,过表达CADM1对卵巢癌细胞增殖和克隆形成无影响,但可抑制迁移和侵袭,起抑癌基因的作用.     

Decreased adhesiveness, resistance to anoikis and suppression of GRP94 are integral to the survival of circulating tumor cells in prostate cancer

The presence of circulating tumor cells (CTC) is common in prostate cancer patients, however until recently their clinical significance was unknown. The CTC stage is essential for the formation of distant metastases, and their continuing presence after radical prostatectomy has been shown to predict recurrent or latent disease. Despite their mechanistic and prognostic importance, due both to their scarcity and difficulties in their isolation, little is known about the characteristics that enable their production and survival. The aim of this study was to investigate the molecular mechanisms underlying the survival of CTC cells. A novel CTC cell line from the bloodstream of an orthotopic mouse model of castration-resistant prostate cancer was established and compared with the primary tumor using attachment assays, detachment culture, Western blot, flow cytometry and 2D gel electrophoresis. Decreased adhesiveness and expression of adhesion molecules E-cadherin, beta4-integrin and gamma-catenin, together with resistance to detachment and drug-induced apoptosis and upregulation of Bcl-2 were integral to the development of CTC and their survival. Using proteomic studies, we observed that the GRP94 glycoprotein was suppressed in CTC. GRP94 was also shown to be suppressed in a tissue microarray study of 79 prostate cancer patients, indicating its possible role in prostate cancer progression. Overall, this study suggests molecular alterations accounting for the release and survival of CTC, which may be used as drug targets for either anti-metastatic therapy or the suppression of latent disease. We also indicate the novel involvement of GRP94 suppression in prostate cancer metastasis.     

高表达ITGB1促进人乳腺上皮MCF10A细胞EMT及迁移

目的探讨ITGB1基因过表达对人乳腺上皮MCF10A细胞迁移和侵袭的影响。方法构建重组质粒p BABEpuro-myc-ITGB1,在人胚肾上皮细胞系293T细胞中包装反转录病毒,转染人乳腺上皮MCF10A细胞系,构建ITGB1基因过表达的稳定细胞系;实验设空白对照组(MCF10A)、阴性对照组(MCF10A-vector)和ITGB1基因过表达组(MCF10A-ITGB1);经嘌呤霉素筛选后,实时荧光定量PCR和蛋白质印迹法检测ITGB1 mRNA及蛋白的表达;Transwell迁移和侵袭实验分别检测细胞株迁移和侵袭能力;蛋白质印迹法进一步检测上皮间质转换(EMT)相关蛋白E-cadherin、vimentin、fibronectin、N-cadherin以及ITGB1下游ILK、p-FAK和FAK蛋白的表达。结果成功构建ITGB1基因稳定过表达人乳腺上皮MCF10A细胞系;ITGB1基因过表达组(MCF10A-ITGB1)与空白对照组(MCF10A)和阴性对照组(MCF10A-vector)细胞相比,迁移能力(P0.05)和侵袭能力(P0.01)显著增强;EMT相关蛋白E-cadherin显著下调(P0.05),vimentin、fibronectin、N-cadherin以及ITGB1下游ILK,p-FAK蛋白显著上调(P0.05)。结论在人乳腺上皮MCF10A细胞中,过表达ITGB1基因诱导细胞EMT并促进其迁移和侵袭。     

miR-425 regulates cell proliferation,migration and apoptosis by targeting AMPH-1 in non-small-cell lung cancer

BackgroundMicroRNAs (miRNAs) have been proved to act as vital roles on non-small-cell lung cancer (NSCLC), and miR-425 has been proven to serve an important function in several tumors. However, the functional role of miR-425 on NSCLC is still unclear.MethodsThe mRNA and protein expression of miR-425 and AMPH-1 were determined by qRT-PCR and western blot analysis, respectively. NSCLC cells (SK-MES-1 and A549) proliferation and migration were measured by CCK-8 and transwell assay, respectively. Cell apoptosis was assessed by flow cytometry and western blotting, In addition, luciferase reporter assay was carried out to confirm the direct targeting of AMPH-1 by miR-425. Xenograft experiments were performed to observe the tumorigenesis of miR-425 in vivo.ResultsThe results showed that miR-425 was overexpressed and AMPH-1 expression was downregulated in SK-MES-1 and A549 cells. Silencing miR-425 inhibited proliferation, migration and promoted apoptosis of NSCLC cells. Moreover, we proved that miR-425 could target AMPH-1. The expression of AMPH-1was upregulated in A549 with miR-425 inhibitor. Moreover, miR-425 knockdown were less tumorigenic than the control in vivo.ConclusionsTaken together, miR-425 could promote the proliferation, invasion and suppress apoptosis by targeting AMPH-1 in NSCLC cells. miR-425/AMPH-1 axis may represent a potential therapeutic strategy or novel prognostic biomarkers to NSCLC.     

PTTG1通过上皮-间质转化促进非小细胞肺癌的迁移和侵袭

目的 研究PTTG1在非小细胞肺癌侵袭转移中的作用.方法 应用免疫组织化学染色法检测80例NSCLC组织中PTTG1、E-cadherin和Vimentin的表达,并分析其相关性.细胞分组:1)A549/con,转染空载的A549,2)A549/PTTG1,转染目的基因的A549,3)Scr/H1299,转染空载的H1299,4)SiPTTG1/H1299,敲除PTTG1的H1299;用Western blot检测细胞中PTTG1、E-cadherin、Vimentin蛋白的表达情况.结果 NSCLC组织中PTG1蛋白的阳性表达率为85％与E-cadherin的表达呈负相关(P＜0.05)而与Vimentin的表达呈正相关(P＜0.05).Western blot结果显示在SiPTTG1/H1299细胞中PTTG1蛋白表达水平明显降低,Vimentin蛋白表达水平降低而E-cadherin蛋白表达水平升高.同时在A549/PTTG1细胞中Vimentin蛋白表达水平升高而E-cadherin蛋白表达水平降低.结论 PTG1能促进NSCLC EMT的发生,从而促进NSCLC的侵袭和转移.     

纺锤菌素抑制胃癌细胞的侵袭和转移

目的探讨纺锤菌素(netropsin)对胃癌细胞侵袭和转移能力的影响及其分子机制。方法用Transwell检测胃癌细胞侵袭和转移能力,用Western blot检测EMT相关标志物E-cadherin和vimentin表达,用免疫荧光检测β-catenin的细胞定位,验证netropsin作用前后Wnt/β-catenin信号通路活性。结果 Netropsin浓度25μmol/L时对MKN28细胞增殖有抑制作用,netropsin可以降低上皮标志物E-cadherin的表达,上调间质标志物vimentin的表达;netropsin可以通过抑制胃癌细胞的EMT,降低胃癌细胞侵袭和转移能力(P0.05),同时可阻止β-catenin进入细胞核。结论 Netropsin可以通过与HMGA2竞争结合转录因子结合位点抑制Wnt/β-catenin信号通路,降低胃癌细胞EMT的发生,从而抑制胃癌细胞侵袭能力。     

miR-375对人结肠癌细胞株HCT116活性、细胞周期及凋亡的影响

目的:探讨微小RNA-375(microRNA-375,miR-375)对人结肠癌细胞HCT116活性、细胞周期及凋亡的影响。方法:Real-time PCR检测不同结直肠癌细胞中miR-375的表达情况。脂质体转染法将miR-375模拟物(mimics)转入HCT116细胞,用real-time PCR法检测miR-375及AEG-1 mRNA的表达情况;MTT法检测细胞活性的改变情况;流式细胞技术检测miR-375对细胞凋亡及细胞周期的影响。结果:Real-time PCR结果显示HCT116在4个结直肠癌细胞株中miR-375的表达量最低;miR-375 mimics组中miR-375表达量较对照组明显上调;miR-375高表达可以显著抑制AEG-1 mRNA的表达水平。miR-375 mimics组细胞活性明显受到抑制,同时细胞凋亡率明显增加,G1期所占细胞数增加,而S期所占细胞数减少。结论:miR-375可以抑制结肠癌HCT116细胞的活性,介导细胞周期阻滞并促进其凋亡。miR-375作为一种抑癌因子,在结肠癌中可能通过抑制AEG-1发挥抑癌作用。     

Knockdown of PFTK1 inhibits tumor cell proliferation,invasion and epithelial-to-mesenchymal transition in pancreatic cancer

PFTK1 was identified as a member of the cyclin-dependent kinase (CDK) family and it is frequently upregulated in many types of tumors. However, its expression and role in pancreatic cancer has not been yet reported. In this study, we aimed to explore the expression and function in pancreatic cancer. The present study verified that PFTK1 was highly expressed in pancreatic cancer cell lines. The in vitro experiments demonstrated that knockdown of PFTK1 inhibited the proliferation, migration and invasion of pancreatic cancer cells as well as the epithelial-to-mesenchymal transition (EMT) progress. Finally, knockdown of PFTK1 inhibited the expression of p-PI3K and p-Akt in pancreatic cancer cells. In summary, the present study has provided further evidence that knockdown of PFTK1 inhibited the proliferation and invasion of pancreatic cancer cells as well as the EMT progress by suppressing the PI3K/Akt signaling pathway. Therefore, these findings reveal that PFTK1 might potentially become a novel strategy for targeting pancreatic cancer.