上皮间质转化与肿瘤侵袭转移关系的研究进展

上皮间质转化(epithelial-mesenchymal transition,EMT)是指上皮细胞失去极性,失去与基底膜的连接等上皮表型,通过特定程序转化为具有间质表型的生物学过程,从而获得了较高的迁移与侵袭、抗凋亡和降解细胞外基质的能力,与肿瘤的侵袭转移密切相关。参与这一过程的细胞内信号转导途径主要有:TGF-β信号途径、PI3K/AKT途径、Notch信号通路、Wnt信号通路等。本文就EMT在肿瘤侵袭转移中的作用及其分子机制的研究作一综述。     

上皮-间质转化在消化道恶性肿瘤转移中的作用

上皮-间质转化(epithelial-mesenchymal transition,EMT)是指上皮细胞失去极性,失去与基膜的连接等上皮表型,通过特定程序转化为具有间质表型的生物学过程,从而获得了较高的迁移与侵袭、抗凋亡和降解细胞外基质的能力,与肿瘤的侵袭转移密切相关.参与这一过程的细胞内信号转导途径主要有:TGF-β信号途径、NF-kB信号通路、Notch信号通路等.本文综合目前研究进展,就EMT在消化道恶性肿瘤侵袭转移中的关系及其与肿瘤干细胞、MicroRNA的联系作一综述.     

与肿瘤转移相关的上皮间质转化信号通路研究进展

恶性肿瘤细胞的侵袭和转移是患者死亡的主要原因,而上皮间质转化（epithelial　mesenchymal　transition,EMT）是肿瘤细胞侵袭和迁移的关键步骤。肿瘤细胞发生上皮间质转化可通过多种信号通路介导产生,深入了解与EMT相关的信号通路,可在信号通路中设立靶点,中止EMT的发生,进而阻止肿瘤侵袭、转移。本文就与肿瘤转移相关的EMT信号通路研究进展作一综述。     

上皮间质转化在肿瘤侵袭转移中的作用

上皮间质转化(epithelial-mesenchymal transitions,EMT)与肿瘤的侵袭转移密切相关,涉及多个信号通路和复杂的分子机制.参与这一过程的信号通路有TGF-β信号途径、PI3K/AKT途径、受体酪氨酸激酶Ras-MAPK途径、WNT信号途径等,研究其在肿瘤侵袭转移中的发生发展机制,从而为阻断肿瘤转移提供新的有效的靶点.     

Notch信号通路介导EMT与肿瘤侵袭转移的研究进展

摘 要：Notch信号通路是一个在进化过程中高度保守的信号通路,它广泛参与细胞的增殖、分化及凋亡过程,在肿瘤的发生发展,侵袭与转移过程中发挥着重要作用。上皮间质转化（epithelial-mesenchymal transition,EMT)与恶性肿瘤的局部浸润和远处转移密切相关,研究证明介导EMT在此过程中的细胞内信号途径主要有以下几种,分别是：PI3K/AKT途径、TGF-β信号途径、Wnt信号通路、Hedgehog通路、IL-6/STAT3通路、Notch信号通路等。全文就Notch信号通路介导EMT在肿瘤侵袭转移中的作用及其分子机制的研究进展作一综述。     

上皮间质转化在肿瘤发生发展中的作用

上皮间质转化(EMT)是指上皮细胞向间质细胞转化的现象。EMT与恶性肿瘤的发生、发展、侵袭及转移有着密切的关系,深入研究与EMT形成有关的信号通路及多种转录因子,将有利于人们寻找阻断EMT过程、治疗肿瘤的新方法。     

PI3K/AKT信号通路轴在肿瘤上皮细胞间质转化中作用的研究进展

肿瘤上皮间质转化（epithelial-mesenchymal transition,EMT）与肿瘤耐药、侵袭、迁移、发生远处转移等生物学行为密切相关.肿瘤微环境中多种细胞因子及其激活的信号通路均参与细胞的EMT.近年来,越来越多的文献报道PI3K/AKT信号转导途径在肿瘤细胞发生EMT过程中的作用尤为重要.本文将重点讨论PI3K/AKT途径在对E-钙黏蛋白（E-cadherin,E-Cad）的调控及其与其他信号通路协同诱发EMT过程中的作用,并对PI3 K/AKT抑制剂在肿瘤治疗的研究进行回顾.     

信号通路调控上皮间质转化参与肿瘤侵袭转移的分子机制

上皮间质转化（EMT）是上皮细胞向间充质细胞分化的过程,EMT在恶性肿瘤的侵袭转移中广泛存在。EMT的发生与多种细胞因子、信号转导通路及转录因子有关,受多种影响因素的共同调控。上皮细胞表型的不同程度转化是细胞内外信号传递共同作用的结果。细胞外信号通过与细胞表面特异性受体相结合将信号转入细胞内,再通过胞内的信号转导途径,活化不同的核内转导因子,最终调节转导基因的表达。     

上皮细胞间质转型调控胰腺癌侵袭转移的分子机制

上皮细胞间质转型(EMT)以上皮细胞表型的缺失和问质特性的获得为主要特征.EMT增加细胞迁移、侵袭和抗凋亡能力,在肿瘤侵袭转移中发挥重要作用.钙黏素转换、生长因子、转录因子、microRNA和信号通路等在EMT调控胰腺癌侵袭转移中发挥重要作用.     

乳腺癌上皮间质转化与耐药关系的研究进展

肿瘤上皮-间质转化(epithelial-mesenchymal transitions,EMT)是指肿瘤在各种因素作用下上皮细胞转变为具有高侵袭、转移能力间质表型的过程。EMT与细胞上皮表型标志物E-钙黏蛋白表达下调、间质表型标志物上调和相关基因表达改变有关。EMT的发生能够促进乳腺癌侵袭、转移和干细胞特性获得,诱导乳腺癌细胞对化疗、内分泌治疗和靶向药物治疗产生获得性耐药。同时研究发现,乳腺癌耐药细胞能够发生EMT,并获得干细胞表型。因此,针对乳腺癌细胞EMT的相关研究可以帮助人们在肿瘤抗耐药治疗中找到新的策略。本文旨在对EMT与乳腺癌发生获得性耐药之间关系的最新研究进展作一综述。     

TGF-β对EMT的诱导及EMT抑制剂研究进展

上皮-间质转化(EMT)是肿瘤细胞获得侵袭和转移能力的最主要途径。转化生长因子β(TGF-β)是已知诱导肿瘤细胞发生EMT的关键因子。本文系统介绍TGF-β及其诱导肿瘤细胞发生EMT的信号通路,并综述抑制EMT发生的新抑制剂。     

PDGFRB Promotes Liver Metastasis Formation of Mesenchymal-Like Colorectal Tumor Cells

In epithelial tumors, the platelet-derived growth factor receptor B (PDGFRB) is mainly expressed by stromal cells of mesenchymal origin. Tumor cells may also acquire PDGFRB expression following epithelial-to-mesenchymal transition (EMT), which occurs during metastasis formation. Little is known about PDGFRB signaling in colorectal tumor cells. We studied the relationship between PDGFRB expression, EMT, and metastasis in human colorectal cancer (CRC) cohorts by analysis of gene expression profiles. PDGFRB expression in primary CRC was correlated with short disease-free and overall survival. PDGFRB was co-expressed with genes involved in platelet activation, transforming growth factor beta (TGFB) signaling, and EMT in three CRC cohorts. PDGFRB was expressed in mesenchymal-like tumor cell lines in vitro and stimulated invasion and liver metastasis formation in mice. Platelets, a major source of PDGF, preferentially bound to tumor cells in a non-activated state. Platelet activation caused robust PDGFRB tyrosine phosphorylation on tumor cells in vitro and in liver sinusoids in vivo. Platelets also release TGFB, which is a potent inducer of EMT. Inhibition of TGFB signaling in tumor cells caused partial reversion of the mesenchymal phenotype and strongly reduced PDGFRB expression and PDGF-stimulated tumor cell invasion. These results suggest that PDGFRB may contribute to the aggressive phenotype of colorectal tumors with mesenchymal properties, most likely downstream of platelet activation and TGFB signaling.     

Programmed death ligand 1 regulates epithelial–mesenchymal transition and cancer stem cell phenotypes in hepatocellular carcinoma through the serum and glucocorticoid kinase 2/β-catenin signaling pathway

Programmed death ligand 1 (PD-L1) plays an important role in the occurrence of hepatocellular carcinoma (HCC). The present study indicated that epithelial–mesenchymal transition (EMT) and induction of cancer stem cell (CSC)-like properties contribute to metastasis of cancers. However, the molecular mechanisms underlying PD-L1 and EMT and CSC phenotypes in HCC remain to be elucidated. Here, we report that PD-L1 regulates not only EMT but also the stem-like transition in liver cancer cells. We observed high PD-L1 expression in CD133⁺ liver CSCs and CSC-enriched tumor spheres. Altering PD-L1 expression promoted liver CSC phenotypes by increasing the expression of stemness genes, the CD133⁺ cell population sizes, and the ability to form tumor spheres. Programmed death ligand 1 enhanced HCC cell tumorigenicity and invasion in nude mice. Additionally, PD-L1 overexpression in cells significantly increased cell motility and invasion, as well as the EMT process. Conversely, suppression of PD-L1 in cells had an opposite effect. Prolonged treatment of HCC cells with Akt inhibitor prefosine leads to activation of serum and glucocorticoid kinase 2 (SGK2) and rescued downregulation of PD-L1. Mechanistically, PD-L1 directly interacted with SGK2. Programmed death ligand 1 upregulated SGK2 and activated the SGK2/β-catenin signaling pathway, and promoted EMT and CSC expansion in liver cancer cells, highlighting the role of SGK2 in PD-L1-mediated EMT and CSC phenotypes in liver cancer cells. In conclusion, our findings suggest that PD-L1 activated the SGK2/β-catenin signaling pathway, to induce EMT and acquisition of a stem cell phenotype.     

Snail调控肿瘤细胞上皮间质转化的相关信号通路

肿瘤的转移和侵袭是肿瘤患者死亡的主要原因,肿瘤转移和侵袭的过程中涉及多种因素,上皮间质转化（EMT）是促进其中某一环节的关键因素。转录因子Snail作为肿瘤细胞EMT的关键调控因子,起到了重要的作用。通过对Snail调控肿瘤细胞EMT的相关信号通路的研究,有助于我们更好的理解肿瘤的转移及侵袭机制,为寻找有效的靶点提供理论依据。     

肿瘤相关巨噬细胞与肿瘤细胞上皮间质转化关系的研究进展

上皮间质转化(epithelial-mesenchymal transition,EMT)是上皮细胞在形态学上发生向间质细胞表型的转变,在肿瘤的侵袭和转移过程中发挥重要作用,肿瘤相关巨噬细胞(tumor-associatedmacrophage,TAM)是肿瘤的基本成分之一,通过分泌TNF-α、IL-6、EGF、VEGF、MMP-9、uPA等因子诱导肿瘤细胞发生EMT,协同其刺激新生血管形成、降解基质、促进肿瘤细胞发生局部侵袭及远处转移.     

上皮—间质转化与肿瘤侵袭转移关系的研究进展

上皮-间质转化（EMT）是指上皮细胞在特定的生理和病理情况下转化成有迁移能力的间质细胞的现象。近年来研究发现EMT与肿瘤的侵袭转移密切相关。生长因子、转录因子、microRNA等都可以参与各种信号通路来诱导或调控细胞发生EMT。本文就EMT现象及其与肿瘤侵袭转移的关系进行综述。