Abstract
The Zinc-finger E-box-binding Homeobox-1 (ZEB1) is a transcription factor that promotes epithelial-mesenchymal transition (EMT) and acts as an oncogene in KRAS-mutated lung cancer models. Here we report that ZEB1 exerts the opposite effect in EGFR-mutated lung cancer cells, where it suppresses growth by increasing microRNA-200 targets to antagonize ERBB3, a driver of mutant EGFR-dependent cell growth. Among these targets, NOTCH1 represses ERBB3 promoter activity and the expression of ERBB3. Furthermore, we find that EGFR inhibitor treatment, which inhibits the growth of EGFR-mutated cells, induces ZEB1. Despite its growth-inhibiting effect, EGFR inhibitor-induced ZEB1 strongly promotes EMT-dependent resistance to EGFR inhibitors partially through NOTCH1, suggesting a multifunctional role for NOTCH1 in EGFR-mutated cells. These results support a previously unrecognized genetic cell context-dependent role for ZEB1 and suggest that NOTCH1 may be a useful target for treating resistance to EGFR inhibitors, especially EMT-driven resistance.
Publication types
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Research Support, N.I.H., Extramural
MeSH terms
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Adenocarcinoma / genetics
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Adenocarcinoma / pathology
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Adenocarcinoma of Lung
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Animals
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Cell Line, Tumor
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Cell Proliferation / drug effects
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Drug Resistance, Neoplasm / drug effects
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Drug Resistance, Neoplasm / genetics
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Epithelial-Mesenchymal Transition / drug effects
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Epithelial-Mesenchymal Transition / genetics
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ErbB Receptors / metabolism
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Gefitinib
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Gene Expression Regulation, Neoplastic / drug effects
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Humans
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Lung / metabolism
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Lung / pathology
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Lung Neoplasms / genetics*
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Lung Neoplasms / pathology*
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Male
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Mice, Nude
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MicroRNAs / genetics
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MicroRNAs / metabolism
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Promoter Regions, Genetic / genetics
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Proto-Oncogene Proteins p21(ras) / metabolism
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Quinazolines / pharmacology
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Quinazolines / therapeutic use
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Receptor, ErbB-3 / genetics
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Receptor, ErbB-3 / metabolism
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Receptor, Notch1 / metabolism
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Reproducibility of Results
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Smoking / adverse effects
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Xenograft Model Antitumor Assays
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Zinc Finger E-box-Binding Homeobox 1 / metabolism*
Substances
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KRAS protein, human
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MIRN200 microRNA, human
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MicroRNAs
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Quinazolines
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Receptor, Notch1
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ZEB1 protein, human
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Zinc Finger E-box-Binding Homeobox 1
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ERBB3 protein, human
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ErbB Receptors
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Receptor, ErbB-3
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Proto-Oncogene Proteins p21(ras)
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Gefitinib