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• W1832714398 abstract "// Xiaojun Chen 1, 2 * , Xiaomeng Song 1 * , Wen Yue 2 , Dongshi Chen 2 , Jian Yu 3 , Zhi Yao 1 , Lin Zhang 2 1 Department of Immunology, Tianjin Key Laboratory of Cellular and Molecular Immunology, Key Laboratory of Immuno Microenvironment and Disease of the Educational Ministry, Tianjin Medical University, Tianjin, P.R. China 2 Department of Pharmacology and Chemical Biology, University of Pittsburgh Cancer Institute, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA 3 Department of Pathology, University of Pittsburgh Cancer Institute, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA * These authors have contributed equally to this work Correspondence to: Zhi Yao, e-mail: yaozhi@tijmu.edu.cn Lin Zhang, e-mail: zhanglx@upmc.edu Keywords: fibulin-5, lung cancer, invasion, MMP-7, β-catenin Received: December 18, 2014      Accepted: March 14, 2015      Published: April 02, 2015 ABSTRACT Metastatic lung cancer is incurable and a leading cause of cancer death in the United States. However, the molecular mechanism by which lung cancer cells invade other tissues has remained unclear. We previously identified fibulin-5, an extracellular matrix protein, as a frequently silenced gene in lung cancer and a suppressor of cell invasion. In this study, we found fibulin-5 functions by inhibiting the Wnt/β-catenin pathway. The Cancer Genome Atlas (TCGA) datasets show a strong association between loss of fibulin-5 expression and poor outcomes of lung cancer patients, and also activation of the Wnt target genes MMP-7 and c-Myc . Fibulin-5 impedes Wnt/β-catenin signaling by inhibiting extracellular signal-regulated kinase (ERK) to activate glycogen synthase kinase-3 β (GSK3β), which downregulates β-catenin and prevents its nuclear accumulation, leading to suppression of MMP-7 and c-Myc expression. These effects of fibulin-5 are mediated by its amino-terminal integrin-binding RGD motif. Fibulin-5 also blocks Wnt/β-catenin signaling in vivo in H460 metastasis and H1299 tumor models. Furthermore, knockdown of β-catenin suppresses metastasis of H460 tumors, while knockdown of GSK3β promotes metastasis of fibulin-5-expressing H1752 tumors. Together, our results suggest that fibulin-5 functions as a metastasis suppressor in lung cancer by modulating tumor microenvironment to suppress Wnt/β-catenin signaling." @default.
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• W1832714398 date "2015-04-02" @default.
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• W1832714398 title "Fibulin-5 inhibits Wnt/β-catenin signaling in lung cancer" @default.
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• W1832714398 doi "https://doi.org/10.18632/oncotarget.3609" @default.
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