Abstract
Notch signaling has been reported to correlate with tumor progression and metastasis in several types of cancer. In cholangiocarcinoma (CCA), it has recently been shown that NOTCH1 is overexpressed in both nucleus and cytoplasm of CCA cells; however, the complete understanding of Notch signaling in CCA is still lacking. Here, we aimed to understand the functions of NOTCH1 in CCA cells and the molecular mechanisms that underlie those functions. We used retroviral vectors to overexpress active forms of NOTCH1, the NOTCH1 intracellular domain (N1ICD) and N1ICD that lacks the RBP-J-associated module (RAM), in human CCA cell lines RMCCA-1 and HuCCA-1. Our results showed that activation of Notch signaling by both N1ICD variants enhanced CCA cell proliferation and survival via upregulation of pro-survival protein Mcl-1 and Bcl-xL. Moreover, our LC-MS/MS proteomic studies demonstrated that NOTCH1 may cooperate with 14-3-3 theta to promote CCA cell survival. Knockdown of 14-3-3 theta in RMCCA-1 cells overexpressing N1ICD, diminished pro-survival effects of N1ICD under gemcitabine treatment. In conclusion, these data demonstrated that NOTCH1 plays a role in CCA cell proliferation and survival via the regulation of 14-3-3 theta in a RAM-independent fashion.
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The work was supported by the Thailand Research Fund (TRG5780200) and Mahidol University (T.K.). The authors thank the Central Instrument Facility, Center of Nanoimaging, Faculty of Science, Mahidol University and Sucheewin Krobthong for technical assistance.
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Singrang, N., Kittisenachai, S., Roytrakul, S. et al. NOTCH1 regulates the viability of cholangiocarcinoma cells via 14-3-3 theta. J. Cell Commun. Signal. 13, 245–254 (2019). https://doi.org/10.1007/s12079-018-0488-9
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DOI: https://doi.org/10.1007/s12079-018-0488-9