FBXW7 通过使β-连环蛋白信号失活来抑制血管内皮生长因子(VEGF)的表达,从而抑制卵巢癌细胞的侵袭、迁移和血管生成。
FBXW7 inhibits invasion, migration and angiogenesis in ovarian cancer cells by suppressing VEGF expression through inactivation of β-catenin signaling.
作者信息
Zhong Liping, Pan Yuefen, Shen Junjun
机构信息
Department of Medical Oncology, Huzhou Central Hospital, Affiliated Central Hospital Huzhou University, Huzhou, Zhejiang 313000, P.R. China.
出版信息
Exp Ther Med. 2021 May;21(5):514. doi: 10.3892/etm.2021.9945. Epub 2021 Mar 19.
F-box and WD repeat domain containing 7 (FBXW7) is a tumor suppressor gene frequently inactivated in several human malignancies. The present study aimed to investigate the role of FBXW7 in the invasion, migration and angiogenesis of ovarian cancer (OC) cells, and to identify its potential molecular mechanisms. First, the expression levels of FBXW7 and vascular endothelial growth factor (VEGF) were detected in several human OC cell lines using western blotting. Subsequently, FBXW7 was overexpressed to determine VEGF expression in SKOV3 cells. Transwell, wound healing and tube formation assays were performed following transfection with FBXW7 and VEGF overexpression plasmids to assess invasion, migration and angiogenesis in SKOV3 cells, respectively. Western blot analysis was performed to detect the expression levels of epithelial-to-mesenchymal transition and angiogenesis-associated proteins. In addition, the expression levels of β-catenin and c-Myc were assessed, and lithium chloride (LiCl), an agonist of β-catenin signaling, was used to elucidate the molecular mechanisms by which FBXW7 mediates its antitumor activity in OC. The results demonstrated that FBXW7 expression was markedly downregulated, whilst VEGF expression was markedly upregulated in OC cell lines compared with that in normal ovarian cells. Overexpression of FBXW7 significantly decreased VEGF expression in SKOV3 cells. Notably, overexpression of VEGF reversed the inhibitory effects of FBXW7 overexpression on the invasion, migration and angiogenesis of OC cells, accompanied by upregulated expression levels of N-cadherin, slug, CD31, VEGF receptor 1 (VEGFR1) and VEGFR2, and downregulated expression levels of E-cadherin. Furthermore, overexpression of FBXW7 markedly suppressed β-catenin and c-Myc expression, whereas the decreased expression levels of VEGF, VEGFR1 and VEGFR2 following overexpression of FBXW7 were increased after treatment of SKOV3 cells with LiCl. Overall, the results of the present study suggested that FBXW7 inhibited invasion, migration and angiogenesis of OC cells by suppressing VEGF expression through inactivation of β-catenin signaling. Thus, FBXW7 may be used as a novel therapeutic target for the treatment of OC.
含F盒和WD重复结构域7(FBXW7)是一种肿瘤抑制基因,在多种人类恶性肿瘤中常被失活。本研究旨在探讨FBXW7在卵巢癌细胞侵袭、迁移和血管生成中的作用,并确定其潜在的分子机制。首先,使用蛋白质印迹法检测几种人类卵巢癌细胞系中FBXW7和血管内皮生长因子(VEGF)的表达水平。随后,在SKOV3细胞中过表达FBXW7以确定VEGF的表达。在用FBXW7和VEGF过表达质粒转染后,分别进行Transwell、伤口愈合和管形成试验,以评估SKOV3细胞的侵袭、迁移和血管生成。进行蛋白质印迹分析以检测上皮-间质转化和血管生成相关蛋白的表达水平。此外,评估β-连环蛋白和c-Myc的表达水平,并使用β-连环蛋白信号激动剂氯化锂(LiCl)来阐明FBXW7在卵巢癌中介导其抗肿瘤活性的分子机制。结果表明,与正常卵巢细胞相比,卵巢癌细胞系中FBXW7表达明显下调,而VEGF表达明显上调。FBXW7的过表达显著降低了SKOV3细胞中VEGF的表达。值得注意的是,VEGF的过表达逆转了FBXW7过表达对卵巢癌细胞侵袭、迁移和血管生成的抑制作用,同时N-钙黏蛋白、蛞蝓蛋白、CD31、血管内皮生长因子受体1(VEGFR1)和VEGFR2的表达水平上调,E-钙黏蛋白的表达水平下调。此外,FBXW7的过表达显著抑制了β-连环蛋白和c-Myc的表达,而在用LiCl处理SKOV3细胞后,FBXW7过表达后VEGF、VEGFR1和VEGFR2表达水平的降低有所增加。总体而言,本研究结果表明,FBXW7通过使β-连环蛋白信号失活来抑制VEGF表达,从而抑制卵巢癌细胞的侵袭、迁移和血管生成。因此,FBXW7可能用作治疗卵巢癌的新型治疗靶点。