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  • Original Article
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Notch3 cooperates with the EGFR pathway to modulate apoptosis through the induction of bim

Abstract

Notch signaling is a highly conserved pathway important for normal embryonic development and cancer. We previously demonstrated a role for Notch3 in lung cancer pathogenesis. Notch3 inhibition resulted in tumor apoptosis and growth suppression. In vitro, these effects were enhanced when the epidermal growth factor receptor (EGFR) pathway was also inhibited, suggesting significant cross-talk between the two pathways. How Notch3 and epidermal growth factor receptor–mitogen-activated protein kinase (EGFR–MAPK) pathways cooperate in modulating apoptosis is not yet known. In this study, we provide evidence that Notch3 regulates Bim, a BH-3-only protein, via MAPK signaling. Furthermore, loss of Bim expression prevents tumor apoptosis induced by Notch3 inhibition. Using γ-secretase inhibitor and erlotinib in a xenograft model, Bim induction and tumor inhibition were observed to be enhanced compared with either agent alone, consistent with our previous observation of significant synergism between Notch and EGFR–ras–MAPK signaling. Thus, our data support the hypothesis that Notch3 not only has a crucial role in lung cancer through regulating apoptosis, but also cooperates with the EGFR–MAPK pathway in modulating Bim.

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Acknowledgements

This study was supported by the Grant NCI 1R01 CA115707.

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Correspondence to T P Dang.

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Konishi, J., Yi, F., Chen, X. et al. Notch3 cooperates with the EGFR pathway to modulate apoptosis through the induction of bim. Oncogene 29, 589–596 (2010). https://doi.org/10.1038/onc.2009.366

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  • DOI: https://doi.org/10.1038/onc.2009.366

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