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Nat Commun. 2014 Dec 15;5:5811. doi: 10.1038/ncomms6811.

Constitutive and ligand-induced EGFR signalling triggers distinct and mutually exclusive downstream signalling networks.

Author information

1
Department of Neurology and Neurotherapeutics, University of Texas Southwestern Medical Center, Dallas, Texas 75390, USA.
2
Department of Pathology, University of Texas Southwestern Medical Center, Dallas, Texas 75390, USA.
3
Department of Neurosurgery, University of Texas Southwestern Medical Center, Dallas, Texas 75390, USA.
4
1] Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas 75390, USA [2] Simmons Comprehensive Cancer Center, University of Texas Southwestern Medical Center, Dallas, Texas 75390, USA [3] Esophageal Diseases Center, University of Texas Southwestern Medical Center, Dallas, Texas 75390, USA [4] VA North Texas Health Care System, Dallas, Texas 75216, USA.
5
Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, Texas 75390, USA.
6
Department of Microbiology, Graduate Institute, National Taiwan University, Taipei 100, Taiwan.
7
1] Simmons Comprehensive Cancer Center, University of Texas Southwestern Medical Center, Dallas, Texas 75390, USA [2] Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, Texas 75390, USA [3] Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas, Texas 75390, USA.
8
Department of Molecular Genetics, Cleveland Clinic, Cleveland, Ohio 44195, USA.
9
1] Department of Neurology and Neurotherapeutics, University of Texas Southwestern Medical Center, Dallas, Texas 75390, USA [2] Simmons Comprehensive Cancer Center, University of Texas Southwestern Medical Center, Dallas, Texas 75390, USA [3] VA North Texas Health Care System, Dallas, Texas 75216, USA.

Abstract

Epidermal growth factor receptor (EGFR) overexpression plays an important oncogenic role in cancer. Regular EGFR protein levels are increased in cancer cells and the receptor then becomes constitutively active. However, downstream signals generated by constitutively activated EGFR are unknown. Here we report that the overexpressed EGFR oscillates between two distinct and mutually exclusive modes of signalling. Constitutive or non-canonical EGFR signalling activates the transcription factor IRF3 leading to expression of IFI27, IFIT1 and TRAIL. Ligand-mediated activation of EGFR switches off IRF3-dependent transcription, activates canonical extracellular signal-regulated kinase (ERK) and Akt signals, and confers sensitivity to chemotherapy and virus-induced cell death. Mechanistically, the distinct downstream signals result from a switch of EGFR-associated proteins. EGFR constitutively complexes with IRF3 and TBK1 leading to TBK1 and IRF3 phosphorylation. Addition of epidermal growth factor dissociates TBK1, IRF3 and EGFR leading to a loss of IRF3 activity, Shc-EGFR association and ERK activation. Finally, we provide evidence for non-canonical EGFR signalling in glioblastoma.

PMID:
25503978
PMCID:
PMC4268886
DOI:
10.1038/ncomms6811
[Indexed for MEDLINE]
Free PMC Article

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