Negative Regulation of EGFR-Vav2 Signaling Axis by Cbl Ubiquitin Ligase Controls EGF Receptor-mediated Epithelial Cell Adherens Junction Dynamics and Cell Migration
Open accessAbstract
The E3 ubiquitin ligase Casitas B lymphoma protein (Cbl) controls the ubiquitin-dependent degradation of EGF receptor (EGFR), but its role in regulating downstream signaling elements with which it associates and its impact on biological outcomes of EGFR signaling are less clear. Here, we demonstrate that stimulation of EGFR on human mammary epithelial cells disrupts adherens junctions (AJs) through Vav2 and Rac1/Cdc42 activation. In EGF-stimulated cells, Cbl regulates the levels of phosphorylated Vav2 thereby attenuating Rac1/Cdc42 activity. Knockdown of Cbl and Cbl-b enhanced the EGF-induced disruption of AJs and cell motility. Overexpression of constitutively active Vav2 activated Rac1/Cdc42 and reorganized junctional actin cytoskeleton; these effects were suppressed by WT Cbl and enhanced by a ubiquitin ligase-deficient Cbl mutant. Cbl forms a complex with phospho-EGFR and phospho-Vav2 and facilitates phospho-Vav2 ubiquitinylation. Cbl can also interact with Vav2 directly in a Cbl Tyr-700-dependent manner. A ubiquitin ligase-deficient Cbl mutant enhanced the morphological transformation of mammary epithelial cells induced by constitutively active Vav2; this effect requires an intact Cbl Tyr-700. These results indicate that Cbl ubiquitin ligase plays a critical role in the maintenance of AJs and suppression of cell migration through down-regulation of EGFR-Vav2 signaling.
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EGFR activity status has been linked to intercellular junctional and actomyosin organization and function.
“As EGFR activity status has been linked to intercellular junctional and actomyosin organization and function26–29”
From E-cadherin integrates mechanotransduction and EGFR signaling to control junctional tissue polarization and tight junction positioning (2017) · cites this paper as [27]
The Results report that EGFR signaling reorganized junctional actin and disrupted adherens junctions in human mammary epithelial cells. The cited passages do not establish an effect on myosin or actomyosin function, so that part of the claim goes beyond what this paper shows. (LLM, conf=0.83)
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The Cbl interactome and its functions
Schmidt, M. H. H., & Dikic, I. (2005) · Nature Reviews Molecular Cell Biology · doi:10.1038/nrm1762 · Cited by 395 · see citing works
Structural and Functional Regulation of Tight Junctions by RhoA and Rac1 Small GTPases
Jou, T.-S., Schneeberger, E. E., & James Nelson, W. (1998) · The Journal of Cell Biology · doi:10.1083/jcb.142.1.101 · Cited by 354 · see citing works
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Rübsam, M., Mertz, A. F., Kubo, A., Marg, S., Jüngst, C., Goranci-Buzhala, G., Schauss, A. C., Horsley, V., Dufresne, E. R., Moser, M., et al. (2017) · Nature Communications · doi:10.1038/s41467-017-01170-7 · Cited by 210 · see citing works
- Authors
- Duan, L., Raja, S. M., Chen, G., Virmani, S., Williams, S. H., Clubb, R. J., Mukhopadhyay, C., Rainey, M. A., Ying, G., Dimri, M., Chen, J., Reddi, A. L., Naramura, M., Band, V., & Band, H.
- Affiliations
- Northwestern University (US)
- Corresponding author
- Duan, Lei
- Raja, Srikumar M.
- Band, Hamid
- ORCID
- Venue
- Journal of Biological Chemistry
- Publisher
- Elsevier BV
- Published
- 2011-01
- Volume
- 286
- Issue
- 1
- Pages
- 620-633
- ISSN
- 0021-9258 (ISSN-L)
- PMC
- PMC3013022
- OpenAlex
- W2026132614
- Cited by
- 49
- References
- 2
- Citations by year
- 2026: 1 · 2025: 4 · 2024: 3 · 2022: 2 · 2021: 2 · 2020: 2 · 2019: 1 · 2018: 3 · 2017: 4 · 2016: 7 · 2015: 1 · 2014: 9 · 2013: 4 · 2012: 3
- FWCI
- 1.30
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Journal of Biological Chemistry (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by-nc)
- PubMed (publishedVersion)
- Funders
- U.S. Department of Defense (W81XWH, W81XWH0710351)
- U.S. Department of Health and Human Services
- University of Nebraska Medical Center
- Nebraska Department of Health and Human Services (LB506)
- National Institutes of Health (W81XWH, CA87986)
- National Cancer Institute (CA 94143, CA 116552, R01CA099163, R01CA094143, CA 96844, R01CA096844, CA105489, R01CA105489, CA 87986, R01CA087986, R01CA116552, CA 99163)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
- Keywords
- CBL, EGF receptor, Vav2, Rac1, Cdc42, adherens junctions, cell migration, ubiquitination, E3 ubiquitin ligase, mammary epithelial cells, actin cytoskeleton, EGFR signaling
- MeSH terms
- Actins, Amino Acid Sequence, Animals, Cell Adhesion, Cell Line, Cell Movement, Cytoskeleton, Enzyme Activation, Epidermal Growth Factor, Epithelial Cells, Humans, Molecular Sequence Data, Mutation, Phosphorylation, Signal Transduction, cdc42 GTP-Binding Protein, rac1 GTP-Binding Protein, Protein Transport, Adherens Junctions, Proto-Oncogene Proteins c-cbl, Mice, Proto-Oncogene Proteins c-vav, Ubiquitination, ErbB Receptors
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