Saltar al contenido
Merck

TIMP-1 via TWIST1 induces EMT phenotypes in human breast epithelial cells.

Molecular cancer research : MCR (2014-06-05)
Rosemarie Chirco D'Angelo, Xu-Wen Liu, Abdo J Najy, Young Suk Jung, Joshua Won, Karl X Chai, Rafael Fridman, Hyeong-Reh Choi Kim
RESUMEN

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. 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.

MATERIALES
Referencia del producto
Marca
Descripción del producto

Sigma-Aldrich
Kit de tinción de citoesqueleto de actina / adhesión focal, The Actin Cytoskeleton & Focal Adhesion Staining Kit consists of TRITC-conjugated phalloidin, anti-Vinculin & DAPI for the immunofluorescent staining of actin filaments in the cytoskeleton as well as the nucleus of the cells.
Sigma-Aldrich
MISSION® esiRNA, targeting human TIMP1
Sigma-Aldrich
MISSION® esiRNA, targeting mouse Twist1
Sigma-Aldrich
MISSION® esiRNA, targeting mouse Timp1
Sigma-Aldrich
MISSION® esiRNA, targeting human TWIST1