Increased cell migration and plasticity in Nrf2-deficient cancer cell lines.

Increased cell migration and plasticity in Nrf2-deficient cancer cell lines.
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DOI:
10.1038/onc.2010.118
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发表时间:
2010-06-24
期刊:
影响因子:
8
通讯作者:
Freeman ML
Freeman ML
中科院分区:
医学1区
文献类型:
--
作者:
Rachakonda G;Sekhar KR;Jowhar D;Samson PC;Wikswo JP;Beauchamp RD;Datta PK;Freeman ML

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核因子(红细胞衍生2)样2(Nrf 2)表达在许多癌症中失调。遗传和生物化学方法结合培养细胞中的功能测定用于探索Nrf 2阻遏的后果。通过Keap 1指导的泛素化或表达独立的shRNA/siRNA序列抑制Nrf 2增强细胞ROS,Smad依赖的肿瘤细胞运动性和软琼脂中的生长。Nrf 2的丢失伴随着伴随的Smad连接区/C-末端磷酸化、E-钙粘蛋白转录抑制因子Slug的诱导和细胞-细胞粘附蛋白E-钙粘蛋白的抑制。野生型Nrf 2的异位表达,而不是显性负性Nrf 2,抑制了合成的TGF-β1响应性CAGA导向的荧光素酶报告基因的活性。Nrf 2的shRNA敲低增强了合成CAGA报告基因的活性,以及内源性Smad靶基因纤溶酶原激活物抑制剂-1的表达。最后,我们发现Nrf 2/Smad 3/Smad 4形成了一个免疫沉淀的核复合物。因此,Nrf 2的缺失增加了R-Smad磷酸化和R-Smad信号传导,支持了以下假设:Nrf 2以致癌背景依赖性方式的缺失可以部分地通过使用TGF-β/Smad信号传导来增强细胞可塑性和运动性。
Nuclear Factor (erythroid-derived 2)-like 2 (Nrf2) expression is deregulated in many cancers. Genetic and biochemical approaches coupled with functional assays in cultured cells were used to explore the consequence of Nrf2 repression. Nrf2 suppression by Keap1-directed ubiquitylation or expression of independent shRNA/siRNA sequences enhanced cellular ROS, Smad-dependent tumor cell motility, and growth in soft agar. Loss of Nrf2 was accompanied by concomitant Smad linker region/C-terminus phosphorylation, induction of the E-Cadherin transcriptional repressor Slug, and suppression of the cell-cell adhesion protein E-Cadherin. Ectopic expression of wildtype Nrf2, but not dominant negative Nrf2, suppressed the activity of a synthetic TGF-β1 responsive CAGA-directed luciferase reporter. shRNA knock-down of Nrf2 enhanced the activity of the synthetic CAGA-reporter, as well as the expression of the endogenous Smad target gene plasminogen activator inhibitor-1. Finally, we found that Nrf2/Smad3/Smad4 formed an immunoprecipitable nuclear complex. Thus, loss of Nrf2 increased R-Smad phosphorylation and R-Smad signaling, supporting the hypothesis that loss of Nrf2 in an oncogenic context-dependent manner can enhance cellular plasticity and motility, in part by using TGF-β/Smad signaling.
悬浮在胶原蛋白凝胶中的上皮可以失去极性,并表达迁移间充质细胞的特征。
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