Abstract
Recent studies have established that amplification of the MET proto-oncogene can cause resistance to epidermal growth factor receptor (EGFR) tyrosine kinase inhibitors (TKIs) in non-small cell lung cancer (NSCLC) cell lines with EGFR-activating mutations. The role of non-amplified MET in EGFR-dependent signaling before TKI resistance, however, is not well understood. Using NSCLC cell lines and transgenic models, we demonstrate here that EGFR activation by either mutation or ligand binding increases MET gene expression and protein levels. Our analysis of 202 NSCLC patient specimens was consistent with these observations: levels of MET were significantly higher in NSCLC with EGFR mutations than in NSCLC with wild-type EGFR. EGFR regulation of MET levels in cell lines occurred through the hypoxia-inducible factor (HIF)-1α pathway in a hypoxia-independent manner. This regulation was lost, however, after MET gene amplification or overexpression of a constitutively active form of HIF-1α. EGFR- and hypoxia-induced invasiveness of NSCLC cells, but not cell survival, were found to be MET dependent. These findings establish that, absent MET amplification, EGFR signaling can regulate MET levels through HIF-1α and that MET is a key downstream mediator of EGFR-induced invasiveness in EGFR-dependent NSCLC cells.
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Acknowledgements
We thank Drs Mien-Chie Hung, Scott Lippman, and Kian Ang for their critical review, Dr Jeffrey Engelman for the EGFR-transfected NIH 3T3 cell lines, and Joseph Munch for editorial assistance. Supported in part by the NIH Lung Cancer SPORE grant P50 CA70907, NIH Grant P01 CA06294, Department of Defense Grant W81XWH-07-1-0306 01, awards from the Metastasis Foundation, the Physician-Scientist Program, and the American Society for Clinical Oncology Career Development Award (JVH). JVH is a Damon Runyon-Lilly Clinical Investigator supported in part by the Damon Runyon Cancer Research Foundation (CI 24-04).
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Xu, L., Nilsson, M., Saintigny, P. et al. Epidermal growth factor receptor regulates MET levels and invasiveness through hypoxia-inducible factor-1α in non-small cell lung cancer cells. Oncogene 29, 2616–2627 (2010). https://doi.org/10.1038/onc.2010.16
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DOI: https://doi.org/10.1038/onc.2010.16
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