Abstract
Several distinct mutations within the kinase domain of the epidermal growth factor receptor (EGFR) are associated with non-small cell lung cancer, but mechanisms underlying their oncogenic potential are incompletely understood. Although normally ligand-induced kinase activation targets EGFR to Cbl-mediated receptor ubiquitinylation and subsequent degradation in lysosomes, we report that certain EGFR mutants escape this regulation. Defective endocytosis characterizes a deletion mutant of EGFR, as well as a point mutant (L858R-EGFR), whose association with c-Cbl and ubiquitinylation are impaired. Our data raise the possibility that refractoriness of L858R-EGFR to downregulation is due to enhanced heterodimerization with the oncogene product HER2, which leads to persistent stimulation.
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Acknowledgements
We thank Drs Wallace Langdon and Dirk Bohmann for plasmids. Our laboratory is supported by research grants from the National Cancer Institute (grant CA72981, to YY), the Israel Cancer Research Fund and the German-Israel Foundation. YY is the incumbent of the Harold and Zelda Goldenberg Professorial Chair.
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Shtiegman, K., Kochupurakkal, B., Zwang, Y. et al. Defective ubiquitinylation of EGFR mutants of lung cancer confers prolonged signaling. Oncogene 26, 6968–6978 (2007). https://doi.org/10.1038/sj.onc.1210503
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DOI: https://doi.org/10.1038/sj.onc.1210503
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