Keywords :
Animals; Carcinogenesis/genetics; Cell Movement/genetics; Cell Proliferation/genetics; Chick Embryo; Epithelial-Mesenchymal Transition/genetics; Gene Expression Regulation, Neoplastic; Humans; Mitogen-Activated Protein Kinase 1/biosynthesis/genetics; Neoplasm Invasiveness/genetics; Neoplasm Metastasis; Phosphorylation; Transcription Factors/biosynthesis/genetics; Triple Negative Breast Neoplasms/genetics/pathology; Vimentin/biosynthesis/genetics; Xenograft Model Antitumor Assays
Abstract :
[en] Epithelial-mesenchymal transition (EMT) in cells is a developmental process adopted during tumorigenesis that promotes metastatic capacity. In this study, we advance understanding of EMT control in cancer cells with the description of a novel vimentin-ERK axis that regulates the transcriptional activity of Slug (SNAI2). Vimentin, ERK, and Slug exhibited overlapping subcellular localization in clinical specimens of triple-negative breast carcinoma. RNAi-mediated ablation of these gene products inhibited cancer cell migration and cell invasion through a laminin-rich matrix. Biochemical analyses demonstrated direct interaction of vimentin and ERK, which promoted ERK activation and enhanced vimentin transcription. Consistent with its role as an intermediate filament, vimentin acted as a scaffold to recruit Slug to ERK and promote Slug phosphorylation at serine-87. Site-directed mutagenesis established a requirement for ERK-mediated Slug phosphorylation in EMT initiation. Together, these findings identified a pivotal step in controlling the ability of Slug to organize hallmarks of EMT.
Scopus citations®
without self-citations
82