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Article

Resveratrol enhances the radiosensitivity of nasopharyngeal carcinoma cells by downregulating E2F1

  • Authors:
    • Yuhui Tan
    • Xianli Wei
    • Wenyin Zhang
    • Xiaolan Wang
    • Kun Wang
    • Biaoyan Du
    • Jianyong Xiao
  • View Affiliations / Copyright

    Affiliations: Department of Biochemistry, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong 510006, P.R. China, Department of Medical Instruments, Guangdong Food and Drug Vocational College, Guangzhou, Guangdong 510520, P.R. China, Department of Pathology, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong 510006, P.R. China
  • Pages: 1833-1841
    |
    Published online on: January 30, 2017
       https://doi.org/10.3892/or.2017.5413
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Abstract

Identification of safe, effective radiosensitizing agents is urgently needed to improve the outcome of radiotherapy in nasopharyngeal cancer (NPC). In this study, we assessed the ability of the polyphenol resveratrol to act as a radiosensitizer in vitro and in vivo. CNE-1 cells were treated with 50 µM resveratrol for 24 h, then irradiated. E2F transcription factor 1 (E2F1) was stably knocked down and overexpressed using lentiviruses. A xenograft model of NPC was established in nude mice using CNE-1 cells. Compared to control DMSO‑treated CNE-1 cells, resveratrol inhibited colony-forming ability and induced G1 phase cell cycle arrest. Radiation survival curves confirmed resveratrol significantly sensitized CNE-1 cells, and resveratrol in combination with 2 Gy irradiation synergistically increased apoptosis. Immunoblotting showed resveratrol dose- and time-dependently downregulated E2F1 and phospho-AKT (p-AKT). Knockdown of E2F1 significantly increased radiosensitivity and downregulated p-AKT; overexpression of E2F1 reversed resveratrol-induced radiosensitivity and upregulated p-AKT. In vivo, 50 mg/kg/day resveratrol and 4 Gy irradiation led to significantly lower tumor volume and tumor weight compared to resveratrol or irradiation alone. Our findings show that resveratrol increases the radiosensitivity of NPC cells by downregulating E2F1 and inhibiting p-AKT, and therefore has potential as a radiosensitizer for NPC.
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Copy and paste a formatted citation
Spandidos Publications style
Tan Y, Wei X, Zhang W, Wang X, Wang K, Du B and Xiao J: Resveratrol enhances the radiosensitivity of nasopharyngeal carcinoma cells by downregulating E2F1. Oncol Rep 37: 1833-1841, 2017.
APA
Tan, Y., Wei, X., Zhang, W., Wang, X., Wang, K., Du, B., & Xiao, J. (2017). Resveratrol enhances the radiosensitivity of nasopharyngeal carcinoma cells by downregulating E2F1. Oncology Reports, 37, 1833-1841. https://doi.org/10.3892/or.2017.5413
MLA
Tan, Y., Wei, X., Zhang, W., Wang, X., Wang, K., Du, B., Xiao, J."Resveratrol enhances the radiosensitivity of nasopharyngeal carcinoma cells by downregulating E2F1". Oncology Reports 37.3 (2017): 1833-1841.
Chicago
Tan, Y., Wei, X., Zhang, W., Wang, X., Wang, K., Du, B., Xiao, J."Resveratrol enhances the radiosensitivity of nasopharyngeal carcinoma cells by downregulating E2F1". Oncology Reports 37, no. 3 (2017): 1833-1841. https://doi.org/10.3892/or.2017.5413
Copy and paste a formatted citation
x
Spandidos Publications style
Tan Y, Wei X, Zhang W, Wang X, Wang K, Du B and Xiao J: Resveratrol enhances the radiosensitivity of nasopharyngeal carcinoma cells by downregulating E2F1. Oncol Rep 37: 1833-1841, 2017.
APA
Tan, Y., Wei, X., Zhang, W., Wang, X., Wang, K., Du, B., & Xiao, J. (2017). Resveratrol enhances the radiosensitivity of nasopharyngeal carcinoma cells by downregulating E2F1. Oncology Reports, 37, 1833-1841. https://doi.org/10.3892/or.2017.5413
MLA
Tan, Y., Wei, X., Zhang, W., Wang, X., Wang, K., Du, B., Xiao, J."Resveratrol enhances the radiosensitivity of nasopharyngeal carcinoma cells by downregulating E2F1". Oncology Reports 37.3 (2017): 1833-1841.
Chicago
Tan, Y., Wei, X., Zhang, W., Wang, X., Wang, K., Du, B., Xiao, J."Resveratrol enhances the radiosensitivity of nasopharyngeal carcinoma cells by downregulating E2F1". Oncology Reports 37, no. 3 (2017): 1833-1841. https://doi.org/10.3892/or.2017.5413
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