Mig-6 controls EGFR trafficking and suppresses gliomagenesis Academic Article uri icon

Overview

MeSH Major

  • Adaptor Proteins, Signal Transducing
  • Brain Neoplasms
  • Gene Expression Regulation, Neoplastic
  • Glioma
  • Receptor, Epidermal Growth Factor
  • Tumor Suppressor Proteins

abstract

  • Glioblastoma multiforme (GBM) is the most common and lethal primary brain cancer that is driven by aberrant signaling of growth factor receptors, particularly the epidermal growth factor receptor (EGFR). EGFR signaling is tightly regulated by receptor endocytosis and lysosome-mediated degradation, although the molecular mechanisms governing such regulation, particularly in the context of cancer, remain poorly delineated. Here, high-resolution genomic profiles of GBM identified a highly recurrent focal 1p36 deletion encompassing the putative tumor suppressor gene, Mig-6. We show that Mig-6 quells the malignant potential of GBM cells and dampens EGFR signaling by driving EGFR into late endosomes and lysosome-mediated degradation upon ligand stimulation. Mechanistically, this effect is mediated by the binding of Mig-6 to a SNARE protein STX8, a protein known to be required for late endosome trafficking. Thus, Mig-6 functions to ensure recruitment of internalized receptor to late endosomes and subsequently the lysosomal degradation compartment through its ability to specifically link EGFR and STX8 during ligand-stimulated EGFR trafficking. In GBM, the highly frequent loss of Mig-6 would therefore serve to sustain aberrant EGFR-mediated oncogenic signaling. Together, these data uncover a unique tumor suppression mechanism involving the regulation of receptor trafficking.

publication date

  • April 13, 2010

Research

keywords

  • Academic Article

Identity

Language

  • eng

PubMed Central ID

  • PMC2872443

Digital Object Identifier (DOI)

  • 10.1073/pnas.0914930107

PubMed ID

  • 20351267

Additional Document Info

start page

  • 6912

end page

  • 7

volume

  • 107

number

  • 15