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• W2082648832 abstract "Abstract Tissue inhibitor of metalloproteinase-1 (TIMP-1) regulates intracellular signaling networks for inhibition of apoptosis. Tetraspanin (CD63), a cell surface binding partner for TIMP-1, was previously shown to regulate integrin-mediated survival pathways in the human breast epithelial cell line MCF10A. In the current study, we show that TIMP-1 expression induces phenotypic changes in cell morphology, cell adhesion, cytoskeletal remodeling, and motility, indicative of an epithelial–mesenchymal transition (EMT). This is evidenced by loss of the epithelial cell adhesion molecule E-cadherin with an increase in the mesenchymal markers vimentin, N-cadherin, and fibronectin. Signaling through TIMP-1, but not TIMP-2, induces the expression of TWIST1, an important EMT transcription factor known to suppress E-cadherin transcription, in a CD63-dependent manner. RNAi-mediated knockdown of TWIST1 rescued E-cadherin expression in TIMP-1–overexpressing cells, demonstrating a functional significance of TWIST1 in TIMP-1–mediated EMT. Furthermore, analysis of TIMP-1 structural mutants reveals that TIMP-1 interactions with CD63 that activate cell survival signaling and EMT do not require the matrix metalloproteinase (MMP)–inhibitory domain of TIMP-1. Taken together, these data demonstrate that TIMP-1 binding to CD63 activates intracellular signal transduction pathways, resulting in EMT-like changes in breast epithelial cells, independent of its MMP-inhibitory function. Implications: TIMP-1′s function as an endogenous inhibitor of MMP or as a “cytokine-like” signaling molecule may be a critical determinant for tumor cell behavior. Mol Cancer Res; 12(9); 1324–33. ©2014 AACR." @default.
• W2082648832 created "2016-06-24" @default.
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• W2082648832 date "2014-09-01" @default.
• W2082648832 modified "2023-10-11" @default.
• W2082648832 title "TIMP-1 via TWIST1 Induces EMT Phenotypes in Human Breast Epithelial Cells" @default.
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• W2082648832 doi "https://doi.org/10.1158/1541-7786.mcr-14-0105" @default.
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