title: Phosphotyrosine signaling analysis of site-specific mutations on EGFRvIII identifies determinants governing glioblastoma cell growth.
abstract: To evaluate the role of individual EGFR phosphorylation sites in activating components of the cellular signaling network we have performed a mass spectrometry-based analysis of the phosphotyrosine network downstream of site-specific EGFRvIII mutants, enabling quantification of network-level effects of site-specific point mutations. Mutation at Y845, Y1068 or Y1148 resulted in diminished receptor phosphorylation, while mutation at Y1173 led to increased phosphorylation on multiple EGFRvIII residues. Altered phosphorylation at the receptor was recapitulated in downstream signaling network activation levels, with Y1173F mutation leading to increased phosphorylation throughout the network. Computational modeling of GBM cell growth as a function of network phosphorylation levels highlights the Erk pathway as crucial for regulating EGFRvIII-driven U87MG GBM cell behavior, with the unexpected finding that Erk1/2 is negatively correlated to GBM cell growth. Genetic manipulation of this pathway supports the model, demonstrating that EGFRvIII-expressing U87MG GBM cells are sensitive to Erk activation levels. Additionally, we developed a model describing glioblastoma cell growth based on a reduced set of phosphoproteins, which represent potential candidates for future development as therapeutic targets for EGFRvIII-positive glioblastoma patients.
authors.affiliation: Protein Networks Team, Section for Cell and Molecular Biology, Institute of Cancer Research, London, UK.
authors.forename: Paul H
authors.initials: PH
authors.lastname: Huang
authors.forename: Emily R
authors.initials: ER
authors.lastname: Miraldi
authors.forename: Alexander M
authors.initials: AM
authors.lastname: Xu
authors.forename: Vibin A
authors.initials: VA
authors.lastname: Kundukulam
authors.forename: Amanda M
authors.initials: AM
authors.lastname: Del Rosario
authors.forename: Ryan A
authors.initials: RA
authors.lastname: Flynn
authors.forename: Webster K
authors.initials: WK
authors.lastname: Cavenee
authors.forename: Frank B
authors.initials: FB
authors.lastname: Furnari
authors.forename: Forest M
authors.initials: FM
authors.lastname: White
mesh_terms: D045744:Cell Line, Tumor; D049109:Cell Proliferation; D004789:Enzyme Activation; D066246:ErbB Receptors / Q000235:genetics* / Q000378:metabolism; D053263:Gene Regulatory Networks / Q000502:physiology; D005909:Glioblastoma / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D006801:Humans; D019950:Mitogen-Activated Protein Kinase 1 / Q000378:metabolism; D048052:Mitogen-Activated Protein Kinase 3 / Q000378:metabolism; D008954:Models, Biological; D009154:Mutation; D010766:Phosphorylation; D019000:Phosphotyrosine; D015398:Signal Transduction / Q000235:genetics / Q000502:physiology; D014443:Tyrosine / Q000235:genetics* / Q000378:metabolism
chemical_list: C410723:epidermal growth factor receptor VIII; D019000:Phosphotyrosine; D014443:Tyrosine; D066246:ErbB Receptors; D019950:Mitogen-Activated Protein Kinase 1; D048052:Mitogen-Activated Protein Kinase 3
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