胃腺癌组织Twist蛋白的表达及其与上皮-间质转化的关系

目的 分析胃腺癌组织中Twist蛋白的表达与临床病理参数之间的相关性及其与上皮-间质转化（EMT）的关系,探讨Twist的表达在判断患者预后中的意义.方法 采用免疫组织化学SABC法检测120例胃腺癌标本及其对应癌旁组织中Twist及EMT相关蛋白上皮钙黏素（E-cad）、神经钙黏素（N-cad）的表达情况,统计分析Twist表达与患者临床病理参数的关系及其与E-cad及N-cad表达的相关性.结果 在胃腺癌组织中Twist、E-cad、N-cad阳性率分别为59.1％（71/120）、36.6％（44/120）、47.5％（57/120）,癌旁组织中阳性率分别为17.5％（21/120）、93.3％（112/120）、11.6％（14/120）,两种组织间各指标阳性率差异均有统计学意义（均P＜0.05）.Twist的表达与肿瘤远处转移、淋巴结转移相关,且与浸润深度呈正相关（均P＜ 0.05）.Twist的表达与N-cad和E-cad的表达存在相关性（P＜0.05）.结论 胃腺癌组织中Twist、E-cad、N-cad的表达与癌旁组织明显不同,并且胃腺癌组织中Twist的表达与肿瘤的生物学特征密切相关;胃癌组织中Twist蛋白表达与EMT相关蛋白E-cad表达呈负相关,而与N-cad表达呈正相关.     

沉默HOXB7基因表达在电离辐射诱导肺腺癌细胞上皮间质转化和迁移中的作用

目的:探讨HOXB7对电离辐射诱导的肺腺癌细胞上皮间质转化和迁移能力的影响。方法:采用Western blot 检测蛋白表达变化,划痕实验和 Transwell迁移实验检测电离辐射对肺腺癌A549细胞迁移能力的影响。结果:用不同剂量X-射线辐照A549细胞,发现2 Gy X-射线辐照HOXB7表达量最高;用2 Gy X-射线辐照A549细胞,发现辐照后第3天HOXB7表达量最高;Western blot 检测发现电离辐射明显上调上皮间质转化标志蛋白的表达;划痕实验及Transwell 迁移实验证明电离辐射增强A549细胞迁移能力。沉默HOXB7 后,电离辐射诱导的A549细胞上皮间质转化及迁移能力明显减弱。结论:HOXB7是电离辐射诱导肺腺癌细胞上皮间质转化和迁移的关键蛋白。     

THBS2在肺腺癌组织中的表达及其对肺腺癌细胞迁移、侵袭和上皮间质转化的影响

目的:研究血小板反应蛋白2（thrombospondin 2,THBS2）在肺腺癌组织中的表达及其对肺腺癌细胞H1299和A549迁移能力、侵袭能力、上皮间质转化（epithelial-mesenchymal transition,EMT）的影响,并探究分子机制。方法:运用TIMER和GEPIA数据库分析THBS2 mRNA在泛肿瘤和肺腺癌组织中的表达,利用UALCAN数据库分析THBS2 mRNA在I-IV期肺腺癌组织中的表达差异,通过HPA数据库检测THBS2蛋白在肺腺癌组织中的表达情况。通过免疫印迹实验（Western blot）检测THBS2在人正常支气管上皮细胞（BEAS-2B）和肺腺癌细胞（H1299、A549）中的表达情况。应用质粒转染技术在肺腺癌细胞H1299和A549中分别过表达和敲低THBS2。细胞划痕实验和侵袭实验（Transwell）检测细胞迁移和侵袭能力。Western blot验证THBS2过表达和敲低效率,同时检测EMT相关蛋白和MMP2的表达水平。结果:TIMER数据库与GEPIA数据库检索结果显示THBS2 mRNA在肺腺癌组织中高表达（P＜0.001）。UALCAN数据库分析证明,与正常肺组织相比,THBS2 mRNA在I-IV期肺腺癌组织中均显著表达（P＜0.001）。HPA数据库结果显示,THBS2蛋白在肺腺癌组织中呈现中高等强度表达。细胞划痕实验、Transwell实验和Western blot结果表明,THBS2在人正常支气管上皮细胞和肺腺癌细胞中的表达有显著差异（P＜0.01）;过表达THBS2可增加肺腺癌细胞H1299和A549迁移与侵袭能力（P＜0.01）,EMT相关蛋白E-cadherin表达水平减少,而N-cadherin和Vimentin表达水平增加（P＜0.01）;相反的,敲低THBS2可抑制肺腺癌细胞H1299和A549迁移与侵袭能力（P＜0.01）,EMT相关蛋白E-cadherin表达水平增加,而N-cadherin和Vimentin表达水平减少（P＜0.01）。结论:THBS2在肺腺癌组织中高表达;THBS2在肺腺癌细胞（H1299、A549）中的表达均显著高于人正常支气管上皮细胞（BEAS-2B）;THBS2在肺腺癌细胞H1299和A549中的过表达和敲低影响迁移、侵袭和EMT的过程,可作为肺腺癌治疗的新型潜在靶点。     

Twist在胃癌黏膜组织的表达及在上皮间质转化中的作用

目的:观察上皮间质转化因子Twist在胃癌中的表达情况以及与胃癌恶性生物学行为的相关性。方法:采用免疫组化SP法检测59例胃癌组织中Twist,上皮源性标记物E-cadherin,间叶源性标记物Vimentin的表达,并分析与各临床病理因素之间的关系。结果:59例胃癌组织中Twist阳性表达率为74.6%(44/59),29例观察到E-cadherin表达的降低,同时7例观察到Vimentin表达上调。Twist的表达与淋巴结转移密切相关(P<0.05);而且Twist表达与E-cadherin表达降低(P<0.05)和Vimentin的表达上调(P<0.05)之间都存在相关性。结论:Twist可能通过调控上皮间质转化从而在胃癌的侵袭转移过程中发挥作用。     

Twist在低氧微环境中宫颈癌上皮间质转化中的作用

目的 研究Twist在低氧微环境中宫颈癌上皮间质转化(EMT)中的作用.方法 以二氯化钴处理Hela细胞模拟低氧微环境,细胞的形态变化、迁移能力分别应用倒置显微镜及划痕实验进行评价.Twist、Vimentin和低氧诱导因子-1α(HIF-1α)在Hela细胞中的表达应用细胞免疫荧光法进行检测.结果 低氧处理后Hela细胞获得了间质细胞的形态特征;Hela细胞低氧组迁移率为(20.4±5.9)%,常氧组为(5.2±1.7)%(P<0.05);低氧组Hela细胞HIF-1α、Twist、Vimentin表达均较常氧组显著增高(P均<0.05);低氧组Hela细胞中HIF-1α、Twist、Vimentin的表达两两均呈正相关(P<0.05).结论 低氧条件下Hela细胞中Twist高表达,这可能与宫颈癌EMT发生有关.     

miR-142-5p通过影响上皮间质转化抑制肺腺癌H1650细胞的侵袭与迁移

目的：探讨肺腺癌组织中miR-142-5p的表达及其对H1650细胞增殖、侵袭、迁移及上皮间质转化（epithelieal-mesenchymal transition,EMT）的影响及其作用机制。方法：收集2014年1月至2015年1月在河北医科大学第四医院胸外科行肿瘤切 除并经病理证实的107例肺腺癌患者的癌组织及其癌旁组织标本,以及人肺腺癌细胞系H1650、HCC827、 A549、 H1975、PC9和人 支气管上皮细胞BEAS-2B, 用qPCR实验检测肺腺癌组织及细胞中miR-142-5p的表达水平及其与患者临床特征的关系。分别用 miR-142-5p模拟物（mimics）、miR-阴性对照质粒（miR-NC）转染H1650细胞后, 用CCK8、细胞划痕愈合和Transwell侵袭实验分 别检测H1650细胞的增殖、侵袭和迁移能力。使用生物信息学工具预测miR-142-5p的靶基因,通过双荧光素酶报告基因实验验 证miR-142-5p对靶基因的调控作用,Western blotting检测细胞周期蛋白依赖性激酶5（cyclin-dependent kinase 5,CDK5）及EMT 相关蛋白的表达水平。结果：肺腺癌组织及细胞系中miR-142-5p表达水平显著低于癌旁组织及BEAS-2B细胞（均P<0.01）;107 例肺腺癌组织中, 61例（57.01%）低表达miR-142-5p,其表达水平与患者的TNM分期、淋巴结转移密切相关（均P<0.01）。转染 miR-142-5p模拟物后, H1650细胞中miR-142-5p高表达,细胞的增殖、侵袭和迁移能力显著降低（均P<0.05或P<0.01）。生物信息 学工具预测CDK5是miR-142-5p的靶基因,经双荧光素酶报告基因验证,miR-142-5p可显著降低H1650细胞中CDK5的表达水 平,显著提高E-cadherin表达,降低N-cadherin和Snail的表达水平（均P<0.01）。结论：miR-142-5p在肺腺癌组织和细胞中呈低表 达状态,其通过下调CDK5表达影响EMT抑制H1650细胞的侵袭与迁移能力。     

尼古丁诱导肺癌细胞上皮间质转化促进其侵袭转移

背景与目的我们的前期研究发现尼古丁能诱导肺癌细胞上皮间质转化。本研究的目的是探讨尼古丁诱导的上皮间质转化（epithelial-mesenchymal transition, EMT）与肺癌侵袭之间的关系。方法应用不同浓度尼古丁处理肺腺癌A549细胞,应用Real-time PCR和Western blot方法检测EMT相关分子标志物E-钙粘蛋白（E-cadherin）和波形蛋白（Vimentin）mRNA和蛋白表达水平,应用免疫荧光技术检测β-链蛋白（β-catenin）蛋白表达位置的变化,应用划痕实验和Transwell小室侵袭实验检测尼古丁对肺癌细胞迁移侵袭能力的影响。结果尼古丁明显下调肺癌细胞株A549 E-cadherin mRNA和蛋白水平表达（P<0.01, P<0.01）,并具有浓度和时间依赖性;尼古丁明显上调肺癌细胞株A549 Vimentin mRNA和蛋白水平表达（P<0.01, P<0.01）;尼古丁诱导肺癌细胞株A549细胞β-catenin蛋白发生核转移;划痕实验和侵袭实验观察到尼古丁处理的肺癌细胞株A549细胞的迁移和侵袭能力明显增强（P<0.01, P<0.01）。结论尼古丁能够诱导肺癌细胞发生EMT,并且促进肺癌细胞株A549细胞的体外侵袭潜能。     

低氧对人肺腺癌A549多细胞球体上皮-间质转化促转移的影响

目的:探讨低氧对人肺腺癌A549细胞来源的A549多细胞球体上皮-间质转化(epithelial-mesenchymaltransition,EMT)促转移机制的影响.方法:采用无血清培养(serum-free medium,SFM)的方法培养A549细胞,诱导A549多细胞球体形成;随后将亲本A549细胞和A549多细胞球体在低氧环境下培养24 h,分别检测2种细胞中EMT标志物E-钙黏着素(E-cadherin)和波形蛋白(vimentin)的表达水平,并与它们在常氧条件下的表达情况进行比较.结果:在常氧和低氧条件下,A549多细胞球体中E-cadherin mRNA和蛋白的表达水平均较亲本A549细胞降低,而vimentin的表达水平升高;与常氧条件相比,低氧培养的亲本A549细胞及A549多细胞球体中E-cadherin mRNA和蛋白的表达水平均下调,且以A549多细胞球体下调更为明显,而vimentin的表达水平则升高.结论:A549多细胞球体比亲本A549细胞具有更强的转移能力,低氧条件下A549多细胞球体比常氧条件下的A549多细胞球体具有更强的转移能力.     

宫颈癌上皮-间质转化的研究进展

宫颈癌是常见的妇科恶性肿瘤之一,严重威胁着妇女的健康,且发病率近几年来趋于年轻化。尽管使用了先进的筛查方法和预防性疫苗,但在治疗方案极为有限和副作用严重的情况下,超过一半的宫颈癌病例被诊断为晚期。如何解决上述问题,需从分子生物学层面来更好的认识宫颈癌。其中上皮-间质转化（epithelial-mesenchymal transition,EMT）是近年来研究的热点,EMT是由上皮细胞表型向间质细胞表型转变的可逆的生物学过程,EMT可促进宫颈癌细胞的迁移、侵袭,进而促进肿瘤的转移,影响患者的预后。本文综合目前的研究进展,将对近年来宫颈癌的EMT相关研究进展作一综述。     

Deubiquitinase JOSD1 promotes tumor progression via stabilizing Snail in lung adenocarcinoma

Accumulating evidence suggests that the deubiquitinase JOSD1 accounts for aggressiveness and unfavorable prognosis in multiple human cancers. But, the significance of JOSD1 in lung adenocarcinoma (LUAD) is elusive. We established that JOSD1 was aberrantly overexpressed in LUAD tissues, relative to normal tissues. Elevated JOSD1 levels in LUAD tissues positively related to advanced clinicopathological characteristics and poor overall survival (OS) in LUAD patients. Furthermore, we found that JOSD1 knockdown suppressed tumor cell proliferation and metastasis, whereas overexpression of JOSD1 led to opposite phenotypes. Mechanistically, JOSD1 stabilized Snail protein through deubiquitination, which promotes the epithelial-to-mesenchymal transition (EMT) process. Indeed, JOSD1 promoted tumor cell invasion as well as metastasis on the dependence of Snail. The protein expression analysis of LUAD tissues indicated that JOSD1 positively correlated with Snail. Moreover, JOSD1 and Snail co-overexpression had the worst prognosis in LUAD patients. Overall, these results demonstrated that JOSD1 was significantly overexpressed in LUAD and stabilized Snail via deubiquitination to promote LUAD metastasis.     

STAMBP promotes lung adenocarcinoma metastasis by regulating the EGFR/MAPK signaling pathway

Tumor metastasis is a leading cause of death in lung adenocarcinoma (LUAD) patients, but the molecular events that regulate metastasis have not been completely elucidated. STAMBP is a deubiquitinating enzyme of the Jab1/MPN metalloenzyme family that regulates the stability of substrates in cells by specifically removing ubiquitin molecules. We found that STAMBP expression was increased in the cytoplasm of tumor cells from LUAD patients. The STAMBP level was closely associated with tumor size, lymph node invasion and neoplasm disease stage. A high STAMBP level predicted poor overall survival and disease-free survival in LUAD patients. STAMBP overexpression promoted cell migration and invasion, whereas STAMBP knockdown attenuated these processes in LUAD cells after epidermal growth factor treatment. Mechanistically, increased STAMBP expression promoted the stabilization of Epidermal growth factor receptor (EGFR), whereas STAMBP knockdown induced the degradation of EGFR. STAMBP may deubiquitinate EGFR by localizing in early endosomes and increase EGFR membrane localization in LUAD cells. The overexpression of STAMBP triggered the activation of MAPK signaling after epidermal growth factor treatment. In contrast, this activation was attenuated in STAMBP knockdown cells. Small molecule inhibitors of EGFR and MAPK signaling pathway may block STAMBP-induced cell mobility and invasion as well as ERK activation in cells. Importantly, STAMBP knockdown suppressed LUAD tumor growth and metastasis by regulating the EGFR-mediated ERK activation in a xenograft mouse model. Our findings identified STAMBP as a novel potential target for LUAD therapy.     

circ_0072088通过调控miR-545-3p/STAT3轴促进非小细胞肺癌细胞的恶性生物学行为

目的:探究环状RNA(circular RNA,circRNA)0072088在非小细胞肺癌(non-small cell lung cancer,NSCLC)细胞中的生物学功能及其作用机制.方法:在公共基因芯片数据库Gene Expression Omnibus(GEO)中下载GSE101684数据集,通过GEO2R...     

STAT3 expression in activating EGFR-driven adenocarcinoma of the lung

Bronchioloalveolar carcinoma (BAC) pattern is often seen at the margin of invasive adenocarcinomas. We investigated EGFR signaling abnormalities involved in the progression of adenocarcinoma. Fifty tumors were obtained from patients who underwent surgery for lung adenocarcinoma seen as dense areas in ground glass opacity on computed tomography. Six, 18, and 26 tumors <1cm, 1-2 cm, and ≥2 cm in diameter, respectively, were analyzed. Of the 24 tumors ≤2 cm in diameter, nine were preinvasive and 15 were invasive. EGFR, pAKT, and pMAPK were overexpressed in the center of the adenocarcinoma compared to the BAC component (p<0.01) by immunohistochemistry, while pSTAT3 expression was reversed (p=0.017). In the tumors ≤2 cm in diameter, pSTAT3 expression in the central area was higher in preinvasive tumors than in invasive tumors (p=0.005). pSTAT3 was identified in the BAC component of 88% of the EGFR mutant (n=17) and 82% of the wild-type tumors (n=33). Transgenic mice expressing delE748-A752 EGFR and two lung cancer cell lines (PC-9 mutant and A549 wild-type EGFR) were also investigated. In transgenic mice, pSTAT3 was overexpressed in the BAC component around the adenocarcinoma center. Two lung cancer cell lines that overexpressed pSTAT3 were equally sensitive to a JAK2/STAT3 inhibitor (JSI-124). The role of STAT3 in the progression of adenocarcinoma should be further pursued.     

人ＳＴＡＴ３基因ｓｉＲＮＡ真核表达质粒的构建及鉴定

目的：构建针对人ＳＴＡＴ３基因的ｓｉＲＮＡ真核表达质粒,检测其在细胞水平对ＳＴＡＴ３基因表达的抑制效果。方法：用ＤＮＡ重组技术将针对人ＳＴＡＴ３基因ｍＲＮＡ序列不同位点设计的３个ｓｉＲＮＡ序列克隆到真核表达质粒ｐＲＮＡＴ-Ｕ６.１／ｎｅｏ中构建重组体ｐＲＮＡＴ-Ｕ６.１-ｓｉＲＮＡ,重组质粒经ＰＣＲ检测及测序分析,用脂质体转染重组质粒至人食管癌Ｅｃａ-１０９细胞,Ｇ４１８筛选获得阳性克隆,ＲＴ-ＰＣＲ和Ｗｅｓｔｅｒｎｂｌｏｔ检测ＳＴＡＴ３基因ｍＲＮＡ和蛋白的表达,筛选最佳沉默效率的ｓｉＲＮＡ。结果：ＰＣＲ检测及测序分析结果均提示重组质粒构建正确。ＲＴ-ＰＣＲ和Ｗｅｓｔｅｒｎｂｌｏｔ检测证实ｐＲＮＡＴ-Ｕ６.１-ｓｉＲＮＡ３具有最佳的沉默效率。结论：成功构建人ＳＴＡＴ３基因ｓｉＲＮＡ真核表达质粒,并证实其能够从ｍＲＮＡ和蛋白水平抑制ＳＴＡＴ３基因的表达。