Abstract
Background
Inhibition of Notch by γ-secretase inhibitor (GSI) has been shown to have an antitumor effect in Notch-expressing non-small cell lung cancer (NSCLC) and to induce apoptosis through modulation of Bcl-2 family proteins. In particular, Bim, a BH3-only member of the Bcl-2 family of proteins, has an important role in the induction of apoptosis in NSCLC when cells are treated with GSI. ABT-737, a BH3-only mimetic, targets the pro-survival Bcl-2 family and also induces apoptosis.
Methods
The Notch-expressing NSCLC cell lines H460, A549, H1793, and HCC2429 were used. The combined antitumor effect of GSI and ABT-737 was evaluated using the MTT proliferation assay in vitro and in xenograft mouse models. The expression of the Notch pathway and Bcl-2 family was analyzed using Western blotting analysis when cells were treated with a single drug treatment or a combination treatment.
Results
GSI XX or ABT-737 alone inhibited cell proliferation in a dose-dependent manner, and combination drug treatment showed a synergistic antitumor effect in vitro. In vivo, this drug combination significantly suppressed tumor proliferation compared to the single drug treatment. Phospho-Bcl-2 was downregulated and Bax was upregulated by both the single and combination drug treatments. Bim was induced by a single drug treatment and was enhanced by combination treatment. Combination treatment-induced apoptosis was decreased by Bim inhibition, suggesting that the antitumor effect of the drug combination was dependent on Bim.
Conclusion
Based on our data, we propose that the combination treatment is a promising strategy for NSCLC therapy.
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Acknowledgements
We thank M. Maeda (First Department of Medicine, Hokkaido University School of Medicine) for providing special support and experimental assistance during this study.
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10147_2016_1060_MOESM1_ESM.pptx
Supplementary Fig. S1: The expression of BH3-only proteins in control or drug-treated NSCLC cell lines was evaluated by Western blotting. No significant change in expression was observed between control and treated cells. The expression of Bim and Noxa is presented in Fig. 3C. (PPTX 266 kb)
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Sakakibara-Konishi, J., Ikezawa, Y., Oizumi, S. et al. Combined antitumor effect of γ-secretase inhibitor and ABT-737 in Notch-expressing non-small cell lung cancer. Int J Clin Oncol 22, 257–268 (2017). https://doi.org/10.1007/s10147-016-1060-3
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DOI: https://doi.org/10.1007/s10147-016-1060-3