TβRIII/β-arrestin2 regulates integrin α5β1 trafficking, function, and localization in epithelial cells

The type III TGF-β receptor (TβRIII) is a ubiquitous co-receptor for TGF-β superfamily ligands with roles in suppressing cancer progression, in part through suppressing cell motility. Here we demonstrate that TβRIII promotes epithelial cell adhesion to fibronectin in a β-arrestin2 dependent and TGF-...

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Veröffentlicht in:Oncogene 2013-03, Vol.32 (11), p.1416-1427
Hauptverfasser: Mythreye, K, Knelson, E H, Gatza, C E, Gatza, M L, Blobe, G C
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container_end_page 1427
container_issue 11
container_start_page 1416
container_title Oncogene
container_volume 32
creator Mythreye, K
Knelson, E H
Gatza, C E
Gatza, M L
Blobe, G C
description The type III TGF-β receptor (TβRIII) is a ubiquitous co-receptor for TGF-β superfamily ligands with roles in suppressing cancer progression, in part through suppressing cell motility. Here we demonstrate that TβRIII promotes epithelial cell adhesion to fibronectin in a β-arrestin2 dependent and TGF-β/BMP independent manner by complexing with active integrin α5β1, and mediating β-arrestin2-dependent α5β1 internalization and trafficking to nascent focal adhesions. TβRIII-mediated integrin α5β1 trafficking regulates cell adhesion and fibronectin fibrillogenesis in epithelial cells, as well as α5 localization in breast cancer patients. We further demonstrate that increased TβRIII expression correlates with increased α5 localization at sites of cell-cell adhesion in breast cancer patients, while higher TβRIII expression is a strong predictor of overall survival in breast cancer patients. These data support a novel, clinically relevant role for TβRIII in regulating integrin α5 localization, reveal a novel crosstalk mechanism between the integrin and TGF-β superfamily signaling pathways and identify β-arrestin2 as a regulator of α5β1 trafficking.
doi_str_mv 10.1038/onc.2012.157
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source MEDLINE; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; Nature Journals Online; SpringerLink Journals - AutoHoldings
subjects 631/67/1347
631/80/313
631/80/79/1236
631/80/86
Animals
Apoptosis
Arrestins - genetics
Arrestins - metabolism
Arrestins - physiology
beta-Arrestins
Breast cancer
Caco-2 Cells
Cell adhesion
Cell adhesion & migration
Cell Adhesion - genetics
Cell Biology
Cells, Cultured
Epithelial cells
Epithelial Cells - metabolism
Fibrillogenesis
Fibronectin
Fibronectins - metabolism
Human Genetics
Humans
Integrin alpha5beta1 - metabolism
Integrin alpha5beta1 - physiology
Internal Medicine
Internalization
K562 Cells
Localization
Medicine
Medicine & Public Health
Mice
Models, Biological
Oncology
original-article
Protein Interaction Domains and Motifs - physiology
Protein Transport - genetics
Proteoglycans - chemistry
Proteoglycans - genetics
Proteoglycans - metabolism
Proteoglycans - physiology
Receptors, Transforming Growth Factor beta - chemistry
Receptors, Transforming Growth Factor beta - genetics
Receptors, Transforming Growth Factor beta - metabolism
Receptors, Transforming Growth Factor beta - physiology
Tissue Distribution - genetics
Transforming growth factor-b
title TβRIII/β-arrestin2 regulates integrin α5β1 trafficking, function, and localization in epithelial cells
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