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β3 Integrin–EGF receptor cross-talk activates p190RhoGAP in mouse mammary gland epithelial cells

Active RhoA localizes to plasma membrane, where it stimulates formation of focal adhesions and stress fibers. RhoA activity is inhibited by p190RhoGAP following integrin-mediated cell attachment to allow sampling of new adhesive environments. p190RhoGAP is itself activated by Src-dependent tyrosine...

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Autores principales: Balanis, Nikolas, Yoshigi, Masaaki, Wendt, Michael K., Schiemann, William P., Carlin, Cathleen R.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The American Society for Cell Biology 2011
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3216655/
https://www.ncbi.nlm.nih.gov/pubmed/21937717
http://dx.doi.org/10.1091/mbc.E10-08-0700
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author Balanis, Nikolas
Yoshigi, Masaaki
Wendt, Michael K.
Schiemann, William P.
Carlin, Cathleen R.
author_facet Balanis, Nikolas
Yoshigi, Masaaki
Wendt, Michael K.
Schiemann, William P.
Carlin, Cathleen R.
author_sort Balanis, Nikolas
collection PubMed
description Active RhoA localizes to plasma membrane, where it stimulates formation of focal adhesions and stress fibers. RhoA activity is inhibited by p190RhoGAP following integrin-mediated cell attachment to allow sampling of new adhesive environments. p190RhoGAP is itself activated by Src-dependent tyrosine phosphorylation, which facilitates complex formation with p120RasGAP. This complex then translocates to the cell surface, where p190RhoGAP down-regulates RhoA. Here we demonstrate that the epidermal growth factor receptor (EGFR) cooperates with β3 integrin to regulate p190RhoGAP activity in mouse mammary gland epithelial cells. Adhesion to fibronectin stimulates tyrosine phosphorylation of the EGFR in the absence of receptor ligands. Use of a dominant inhibitory EGFR mutant demonstrates that fibronectin-activated EGFR recruits p120RasGAP to the cell periphery. Expression of an inactive β3 integrin subunit abolishes p190RhoGAP tyrosine phosphorylation, demonstrating a mechanistic link between β3 integrin–activated Src and EGFR regulation of the RhoA inhibitor. The β3 integrin/EGFR pathway also has a positive role in formation of filopodia. Together our data suggest that EGFR constitutes an important intrinsic migratory cue since fibronectin is a key component of the microenvironment in normal mammary gland development and breast cancer. Our data also suggest that EGFR expressed at high levels has a role in eliciting cell shape changes associated with epithelial-to-mesenchymal transition.
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spelling pubmed-32166552012-01-30 β3 Integrin–EGF receptor cross-talk activates p190RhoGAP in mouse mammary gland epithelial cells Balanis, Nikolas Yoshigi, Masaaki Wendt, Michael K. Schiemann, William P. Carlin, Cathleen R. Mol Biol Cell Articles Active RhoA localizes to plasma membrane, where it stimulates formation of focal adhesions and stress fibers. RhoA activity is inhibited by p190RhoGAP following integrin-mediated cell attachment to allow sampling of new adhesive environments. p190RhoGAP is itself activated by Src-dependent tyrosine phosphorylation, which facilitates complex formation with p120RasGAP. This complex then translocates to the cell surface, where p190RhoGAP down-regulates RhoA. Here we demonstrate that the epidermal growth factor receptor (EGFR) cooperates with β3 integrin to regulate p190RhoGAP activity in mouse mammary gland epithelial cells. Adhesion to fibronectin stimulates tyrosine phosphorylation of the EGFR in the absence of receptor ligands. Use of a dominant inhibitory EGFR mutant demonstrates that fibronectin-activated EGFR recruits p120RasGAP to the cell periphery. Expression of an inactive β3 integrin subunit abolishes p190RhoGAP tyrosine phosphorylation, demonstrating a mechanistic link between β3 integrin–activated Src and EGFR regulation of the RhoA inhibitor. The β3 integrin/EGFR pathway also has a positive role in formation of filopodia. Together our data suggest that EGFR constitutes an important intrinsic migratory cue since fibronectin is a key component of the microenvironment in normal mammary gland development and breast cancer. Our data also suggest that EGFR expressed at high levels has a role in eliciting cell shape changes associated with epithelial-to-mesenchymal transition. The American Society for Cell Biology 2011-11-15 /pmc/articles/PMC3216655/ /pubmed/21937717 http://dx.doi.org/10.1091/mbc.E10-08-0700 Text en © 2011 Balanis et al. This article is distributed by The American Society for Cell Biology under license from the author(s). Two months after publication it is available to the public under an Attribution–Noncommercial–Share Alike 3.0 Unported Creative Commons License (http://creativecommons.org/licenses/by-nc-sa/3.0). “ASCB®,” “The American Society for Cell Biology®,” and “Molecular Biology of the Cell®” are registered trademarks of The American Society of Cell Biology.
spellingShingle Articles
Balanis, Nikolas
Yoshigi, Masaaki
Wendt, Michael K.
Schiemann, William P.
Carlin, Cathleen R.
β3 Integrin–EGF receptor cross-talk activates p190RhoGAP in mouse mammary gland epithelial cells
title β3 Integrin–EGF receptor cross-talk activates p190RhoGAP in mouse mammary gland epithelial cells
title_full β3 Integrin–EGF receptor cross-talk activates p190RhoGAP in mouse mammary gland epithelial cells
title_fullStr β3 Integrin–EGF receptor cross-talk activates p190RhoGAP in mouse mammary gland epithelial cells
title_full_unstemmed β3 Integrin–EGF receptor cross-talk activates p190RhoGAP in mouse mammary gland epithelial cells
title_short β3 Integrin–EGF receptor cross-talk activates p190RhoGAP in mouse mammary gland epithelial cells
title_sort β3 integrin–egf receptor cross-talk activates p190rhogap in mouse mammary gland epithelial cells
topic Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3216655/
https://www.ncbi.nlm.nih.gov/pubmed/21937717
http://dx.doi.org/10.1091/mbc.E10-08-0700
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