Abstract
EGFR tyrosine kinase inhibitors cause dramatic responses in EGFR-mutant lung cancer, but resistance universally develops. The involvement of β-catenin in EGFR TKI resistance has been previously reported, however, the precise mechanism by which β-catenin activation contributes to EGFR TKI resistance is not clear. Here, we show that EGFR inhibition results in the activation of β-catenin signaling in a Notch3-dependent manner, which facilitates the survival of a subset of cells that we call "adaptive persisters". We previously reported that EGFR-TKI treatment rapidly activates Notch3, and here we describe the physical association of Notch3 with β-catenin, leading to increased stability and activation of β-catenin. We demonstrate that the combination of EGFR-TKI and a β-catenin inhibitor inhibits the development of these adaptive persisters, decreases tumor burden, improves recurrence free survival, and overall survival in xenograft models. These results supports combined EGFR-TKI and β-catenin inhibition in patients with EGFR mutant lung cancer.
Publication types
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Research Support, N.I.H., Extramural
MeSH terms
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Animals
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Carcinoma, Non-Small-Cell Lung / blood
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Carcinoma, Non-Small-Cell Lung / genetics*
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Carcinoma, Non-Small-Cell Lung / pathology
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Cell Line, Tumor
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DNA-Binding Proteins / metabolism
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Drug Resistance, Neoplasm / drug effects
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Epithelial-Mesenchymal Transition / drug effects
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ErbB Receptors / genetics
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Humans
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Lung Neoplasms / blood
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Lung Neoplasms / genetics*
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Lung Neoplasms / pathology
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Mice, Inbred NOD
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Mice, SCID
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Mutation / genetics*
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Neoplastic Stem Cells / drug effects
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Neoplastic Stem Cells / metabolism
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Neoplastic Stem Cells / pathology
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Phenotype
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Plasminogen Activator Inhibitor 1 / blood
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Protein Kinase Inhibitors / pharmacology*
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Protein Stability / drug effects
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Receptor, Notch3 / metabolism*
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Signal Transduction*
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Transcription Factors / metabolism
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beta Catenin / antagonists & inhibitors
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beta Catenin / metabolism*
Substances
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DNA-Binding Proteins
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MAML1 protein, human
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NOTCH3 protein, human
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Plasminogen Activator Inhibitor 1
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Protein Kinase Inhibitors
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Receptor, Notch3
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Transcription Factors
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beta Catenin
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EGFR protein, human
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ErbB Receptors