Abstract
Non-small cell lung cancer (NSCLC)-associated epidermal growth factor receptor (EGFR) mutants are constitutively active and induce ligand-independent transformation in non-malignant cell lines. We investigated the possibility that the ability of mutant EGFRs to transform cells reflects a constitutive cooperativity with Src using a system in which the overexpression of mutant, but not wild-type, EGFR induced anchorage-independent cell growth. Src was constitutively activated and showed enhanced interaction with mutant EGFRs, suggesting that constitutive EGFR–Src cooperativity may contribute to mutant EGFR-mediated oncogenesis. Indeed, the mutant EGFR-mediated cell transformation was inhibited by Src- as well as EGFR-directed inhibitors. Importantly, a tyrosine to phenylalanine mutation of the major Src phosphorylation site on EGFR, Y845, reduced the constitutive phosphorylation of NSCLC-EGFR mutants, as well as that of STAT3, Akt, Erk and Src, and reduced the mutant EGFR–Src association as well as proliferation, migration and anchorage-independent growth. Reduced anchorage-independent growth and migration were also observed when dominant-negative-Src was expressed in mutant EGFR-expressing cells. Overall, our findings show that mutant EGFR–Src interaction and cooperativity play critical roles in constitutive engagement of the downstream signaling pathways that allow NSCLC-associated EGFR mutants to mediate oncogenesis, and support the rationale to target Src-dependent signaling pathways in mutant EGFR-mediated malignancies.
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Acknowledgements
We thank members of the Band laboratories for helpful suggestions and discussion. This work was supported by: the NIH grants CA87986, CA105489, CA99900, CA116552 and CA99163 to HB, and CA94143, CA96844 and CA81076 to VB; Department of Defense Breast Cancer Research Grants W81XVVH-08-1-0617 (HB) and DAMD17-02-1-0508 (VB); the NCI Cancer Center of Nanotechnology Excellence Grant NCI 1U54 CA119341-01 (HB and VB); the NCI Breast Cancer SPORE and AVON Breast Cancer Fund at Robert H Lurie Cancer Center, Northwestern University; the H Foundation, Chicago, IL, USA; the Jean Ruggles-Romoser Chair of Cancer Research (HB) and the Duckworth Family Chair of Breast Cancer Research (VB); and the Malkin Scholarship (BMC). UNMC-Eppley Cancer Center is supported by an NCI Cancer Center Core Grant.
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Chung, B., Dimri, M., George, M. et al. The role of cooperativity with Src in oncogenic transformation mediated by non-small cell lung cancer-associated EGF receptor mutants. Oncogene 28, 1821–1832 (2009). https://doi.org/10.1038/onc.2009.31
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DOI: https://doi.org/10.1038/onc.2009.31
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