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EGFRvIII escapes down-regulation due to impaired internalization and sorting to lysosomes.

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  • معلومة اضافية
    • المصدر:
      Publisher: Irl Press At Oxford University Press Country of Publication: England NLM ID: 8008055 Publication Model: Print-Electronic Cited Medium: Print ISSN: 0143-3334 (Print) Linking ISSN: 01433334 NLM ISO Abbreviation: Carcinogenesis Subsets: MEDLINE
    • بيانات النشر:
      Publication: Oxford : Irl Press At Oxford University Press
      Original Publication: [New York, IRL Press]
    • الموضوع:
      ErbB Receptors/*biosynthesis ; Lysosomes/*metabolism; Cell Line, Tumor ; Cell Membrane/metabolism ; Down-Regulation ; Endocytosis ; Epidermal Growth Factor/pharmacology ; ErbB Receptors/genetics ; GRB2 Adaptor Protein/metabolism ; Humans ; Phosphorylation ; Protein Transport ; Proto-Oncogene Proteins c-cbl/metabolism ; Signal Transduction ; Ubiquitins/metabolism
    • نبذة مختصرة :
      EGFRvIII is a mutant variant of the epidermal growth factor receptor (EGFR) found exclusively in various cancer types. EGFRvIII lacks a large part of the extracellular domain and is unable to bind ligands; however, the receptor is constitutively phosphorylated and able to activate downstream signaling pathways. Failure to attenuate signaling by receptor down-regulation could be one of the major mechanisms by which EGFRvIII becomes oncogenic. Using a cell system expressing either EGFR or EGFRvIII with no expression of other EGFR family members and with endogenous levels of key degradation proteins, we have investigated the down-regulation of EGFRvIII and compared it to that of EGFR. We show that, in contrast to EGFR, EGFRvIII is inefficiently degraded. EGFRvIII is internalized, but the internalization rate of the mutated receptor is significantly less than that of unstimulated EGFR. Moreover, internalized EGFRvIII is recycled rather than delivered to lysosomes. EGFRvIII binds the ubiquitin ligase c-Cbl via Grb2, whereas binding via phosphorylated tyrosine residue 1045 seems to be limited. Despite c-Cbl binding, the receptor fails to become effectively ubiquitinylated. Thus, our results suggest that the long lifetime of EGFRvIII is caused by inefficient internalization and impaired sorting to lysosomes due to lack of effective ubiquitinylation.
    • الرقم المعرف:
      0 (GRB2 Adaptor Protein)
      0 (Ubiquitins)
      0 (epidermal growth factor receptor VIII)
      62229-50-9 (Epidermal Growth Factor)
      EC 2.3.2.27 (Proto-Oncogene Proteins c-cbl)
      EC 2.7.10.1 (ErbB Receptors)
    • الموضوع:
      Date Created: 20070321 Date Completed: 20071004 Latest Revision: 20181201
    • الموضوع:
      20240829
    • الرقم المعرف:
      10.1093/carcin/bgm058
    • الرقم المعرف:
      17372273