VAV2 regulates epidermal growth factor receptor endocytosis and degradation. 2010

S Thalappilly, and P Soubeyran, and J L Iovanna, and N J Dusetti
INSERM U624, Stress Cellulaire, Marseille F-13288, France.

Vav proteins are guanine nucleotide exchange factors for Rho GTPases that regulate cell adhesion, motility, spreading and proliferation in response to growth factor signalling. In this work, we show that Vav2 expression delayed epidermal growth factor receptor (EGFR) internalization and degradation, and enhanced EGFR, ERK and Akt phosphorylations. This effect of Vav2 on EGFR degradation is dependent on its guanine nucleotide exchange function. Knockdown of Vav2 in HeLa cells enhanced EGFR degradation and reduced cell proliferation. epidermal growth factor stimulation led to co-localization of Vav2 with EGFR and Rab5 in endosomes. We further show that the effect of Vav2 on EGFR stability is modulated by its interaction with two endosome-associated proteins and require RhoA function. Thus, in this work, we report for the first time that Vav2 can regulate growth factors receptor signalling by slowing receptor internalization and degradation through its interaction with endosome-associated proteins.

UI MeSH Term Description Entries
D011992 Endosomes Cytoplasmic vesicles formed when COATED VESICLES shed their CLATHRIN coat. Endosomes internalize macromolecules bound by receptors on the cell surface. Receptosomes,Endosome,Receptosome
D004705 Endocytosis Cellular uptake of extracellular materials within membrane-limited vacuoles or microvesicles. ENDOSOMES play a central role in endocytosis. Endocytoses
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D045744 Cell Line, Tumor A cell line derived from cultured tumor cells. Tumor Cell Line,Cell Lines, Tumor,Line, Tumor Cell,Lines, Tumor Cell,Tumor Cell Lines
D051567 Proto-Oncogene Proteins c-vav Proteins that are guanine nucleotide exchange factors for RHO GTPASES. They contain pleckstrin homology and SH2 domains, through which they function as signal transducing adaptor proteins. c-vav Protein,vav Proto-Oncogene Protein,Proto-Oncogene Protein c-vav,Proto-Oncogene Protein vav,Proto-Oncogene Protein vav1,vav Guanine-Nucleotide Exchange Factor,Proteins c-vav, Proto-Oncogene,Proto Oncogene Protein c vav,Proto Oncogene Protein vav,Proto Oncogene Protein vav1,Proto Oncogene Proteins c vav,Proto-Oncogene Protein, vav,c vav Protein,c-vav, Proto-Oncogene Protein,c-vav, Proto-Oncogene Proteins,vav Guanine Nucleotide Exchange Factor,vav Proto Oncogene Protein,vav, Proto-Oncogene Protein,vav1, Proto-Oncogene Protein
D020696 rab5 GTP-Binding Proteins A genetically related subfamily of RAB GTP-BINDING PROTEINS involved in transport from the cell membrane to early endosomes. This enzyme was formerly listed as EC 3.6.1.47. rab5A GTP-Binding Protein,rab5 GTP-Binding Protein,rab5 Protein,rab5A Protein,GTP-Binding Protein, rab5,GTP-Binding Protein, rab5A,GTP-Binding Proteins, rab5,rab5 GTP Binding Protein,rab5 GTP Binding Proteins,rab5A GTP Binding Protein
D066246 ErbB Receptors A family of structurally related cell-surface receptors that signal through an intrinsic PROTEIN-TYROSINE KINASE. The receptors are activated upon binding of specific ligands which include EPIDERMAL GROWTH FACTORS, and NEUREGULINS. EGF Receptor,Epidermal Growth Factor Receptor,Epidermal Growth Factor Receptor Family Protein,Epidermal Growth Factor Receptor Protein-Tyrosine Kinase,ErbB Receptor,HER Family Receptor,Receptor, EGF,Receptor, Epidermal Growth Factor,Receptor, TGF-alpha,Receptor, Transforming-Growth Factor alpha,Receptor, Urogastrone,Receptors, Epidermal Growth Factor-Urogastrone,TGF-alpha Receptor,Transforming Growth Factor alpha Receptor,Urogastrone Receptor,c-erbB-1 Protein,erbB-1 Proto-Oncogene Protein,EGF Receptors,Epidermal Growth Factor Receptor Family Proteins,Epidermal Growth Factor Receptor Kinase,HER Family Receptors,Proto-oncogene c-ErbB-1 Protein,Receptor Tyrosine-protein Kinase erbB-1,Receptor, ErbB-1,Receptors, Epidermal Growth Factor,Epidermal Growth Factor Receptor Protein Tyrosine Kinase,ErbB-1 Receptor,Family Receptor, HER,Family Receptors, HER,Proto oncogene c ErbB 1 Protein,Proto-Oncogene Protein, erbB-1,Receptor Tyrosine protein Kinase erbB 1,Receptor, ErbB,Receptor, ErbB 1,Receptor, HER Family,Receptor, TGF alpha,Receptor, Transforming Growth Factor alpha,Receptors, EGF,Receptors, Epidermal Growth Factor Urogastrone,Receptors, ErbB,Receptors, HER Family,c erbB 1 Protein,c-ErbB-1 Protein, Proto-oncogene,erbB 1 Proto Oncogene Protein

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