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

Sharmistha Chakraborty, Li Li, Vineshkumar Thidil Puliyappadamba, Gao Guo, Kimmo J. Hatanpaa, Bruce Mickey, Rhonda F. Souza, Peggy Vo, Joachim Herz, Mei-Ru Chen, David A. Boothman, Tej K. Pandita, David H. Wang, Ganes C. Sen and Amyn A. Habib ()
Additional contact information
Sharmistha Chakraborty: University of Texas Southwestern Medical Center
Li Li: University of Texas Southwestern Medical Center
Vineshkumar Thidil Puliyappadamba: University of Texas Southwestern Medical Center
Gao Guo: University of Texas Southwestern Medical Center
Kimmo J. Hatanpaa: University of Texas Southwestern Medical Center
Bruce Mickey: University of Texas Southwestern Medical Center
Rhonda F. Souza: University of Texas Southwestern Medical Center
Peggy Vo: University of Texas Southwestern Medical Center
Joachim Herz: University of Texas Southwestern Medical Center
Mei-Ru Chen: Graduate Institute, National Taiwan University
David A. Boothman: Simmons Comprehensive Cancer Center, University of Texas Southwestern Medical Center
Tej K. Pandita: University of Texas Southwestern Medical Center
David H. Wang: University of Texas Southwestern Medical Center
Ganes C. Sen: Cleveland Clinic
Amyn A. Habib: University of Texas Southwestern Medical Center

Nature Communications, 2014, vol. 5, issue 1, 1-15

Abstract: 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.

Date: 2014
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DOI: 10.1038/ncomms6811

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