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Upregulation of retinoic acid receptor-β reverses drug resistance in cholangiocarcinoma cells by enhancing susceptibility to apoptosis

  • Authors:
    • Hong‑Yue Ren
    • Bo Chen
    • Gui‑Li Huang
    • Yu Liu
    • Dong‑Yan Shen
  • View Affiliations / Copyright

    Affiliations: Biobank, The First Affiliated Hospital of Xiamen University, Xiamen, Fujian 361003, P.R. China, Department of Surgical Oncology, The First Affiliated Hospital of Xiamen University, Xiamen Cancer Center, Xiamen, Fujian 361003, P.R. China, State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, Xiamen, Fujian 361102, P.R. China
    Copyright: © Ren et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Pages: 3602-3608
    |
    Published online on: September 2, 2016
       https://doi.org/10.3892/mmr.2016.5701
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Abstract

Retinoic acid receptor β (RARβ), a known tumor suppressor gene, is frequently silenced in numerous malignant types of tumor. Recent reports have demonstrated that loss of RARβ expression may be responsible, in part, for the drug resistance observed in clinical trials. However, little is known about the role of RARβ in regulating drug sensitivity in patients with cholangiocarcinoma (CCA) with a high risk of mortality and poor outcomes. In the present study, low RARβ expression was observed in the majority of CCA tissues investigated (28/33, 84.8%). In addition, the CCA cell line QBC939, which exhibits low RARβ expression, was found to be significantly resistant to chemotherapeutic agents compared with SK‑ChA‑1, MZ‑ChA‑1 and Hccc9810 CCA cell lines, which exhibit high RARβ expression. Furthermore, upregulation of RARβ significantly enhanced the sensitivity of QBC939 cells to common chemotherapeutic agents both in vitro and in vivo. Upregulation of RARβ was shown to increase the expression of proapoptotic genes bax, bak and bim, in addition to caspase‑3 activity, and decrease the expression of antiapoptotic genes bcl‑2, bcl‑xL and mcl‑1. As a result, CCA cells were more susceptible to caspase‑dependent apoptosis. Taken together, these data suggest that RARβ upregulation rendered CCA cells more sensitive to chemotherapeutic agents by increasing the susceptibility of cells to caspase-dependent apoptosis. These results support the hypothesis that RARβ may be an ideal chemosensitization target for the treatment of patients with drug-resistant CCA.
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Copy and paste a formatted citation
Spandidos Publications style
Ren HY, Chen B, Huang GL, Liu Y and Shen DY: Upregulation of retinoic acid receptor-β reverses drug resistance in cholangiocarcinoma cells by enhancing susceptibility to apoptosis. Mol Med Rep 14: 3602-3608, 2016.
APA
Ren, H., Chen, B., Huang, G., Liu, Y., & Shen, D. (2016). Upregulation of retinoic acid receptor-β reverses drug resistance in cholangiocarcinoma cells by enhancing susceptibility to apoptosis. Molecular Medicine Reports, 14, 3602-3608. https://doi.org/10.3892/mmr.2016.5701
MLA
Ren, H., Chen, B., Huang, G., Liu, Y., Shen, D."Upregulation of retinoic acid receptor-β reverses drug resistance in cholangiocarcinoma cells by enhancing susceptibility to apoptosis". Molecular Medicine Reports 14.4 (2016): 3602-3608.
Chicago
Ren, H., Chen, B., Huang, G., Liu, Y., Shen, D."Upregulation of retinoic acid receptor-β reverses drug resistance in cholangiocarcinoma cells by enhancing susceptibility to apoptosis". Molecular Medicine Reports 14, no. 4 (2016): 3602-3608. https://doi.org/10.3892/mmr.2016.5701
Copy and paste a formatted citation
x
Spandidos Publications style
Ren HY, Chen B, Huang GL, Liu Y and Shen DY: Upregulation of retinoic acid receptor-β reverses drug resistance in cholangiocarcinoma cells by enhancing susceptibility to apoptosis. Mol Med Rep 14: 3602-3608, 2016.
APA
Ren, H., Chen, B., Huang, G., Liu, Y., & Shen, D. (2016). Upregulation of retinoic acid receptor-β reverses drug resistance in cholangiocarcinoma cells by enhancing susceptibility to apoptosis. Molecular Medicine Reports, 14, 3602-3608. https://doi.org/10.3892/mmr.2016.5701
MLA
Ren, H., Chen, B., Huang, G., Liu, Y., Shen, D."Upregulation of retinoic acid receptor-β reverses drug resistance in cholangiocarcinoma cells by enhancing susceptibility to apoptosis". Molecular Medicine Reports 14.4 (2016): 3602-3608.
Chicago
Ren, H., Chen, B., Huang, G., Liu, Y., Shen, D."Upregulation of retinoic acid receptor-β reverses drug resistance in cholangiocarcinoma cells by enhancing susceptibility to apoptosis". Molecular Medicine Reports 14, no. 4 (2016): 3602-3608. https://doi.org/10.3892/mmr.2016.5701
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