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Article

Atorvastatin prolongs the lifespan of radiation‑induced reactive oxygen species in PC-3 prostate cancer cells to enhance the cell killing effect

  • Authors:
    • Hao Yu
    • Shao-Qian Sun
    • Xiao-Bin Gu
    • Wen Wang
    • Xian-Shu Gao
  • View Affiliations / Copyright

    Affiliations: Department of Radiation Oncology, Peking University First Hospital, Peking University, Beijing 100034, P.R. China
  • Pages: 2049-2056
    |
    Published online on: February 14, 2017
       https://doi.org/10.3892/or.2017.5447
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Abstract

Studies have reported that atorvastatin (ATO) may increase the radiosensitivity of malignant cells. However, the influence of ATO on reactive oxygen species (ROS) levels before and after irradiation has not been fully illustrated. In the present study, radiosensitivity was evaluated by a clonogenic assay and a cell survival curve and cell apoptosis was measured by flow cytometry. ROS were detected by a laser scanning confocal microscope and flow cytometry with a DCFH-DA probe. NADPH oxidases (NOXs) and superoxide dismutase (SOD) proteins were detected by immunoblotting, and total SOD activity was measured using an SOD kit. We also conducted transient transfection of NOX2 and NOX4 genes to increase intracellular ROS generation and applied SOD mimetic tempol to enhance ROS elimination ability. Our results demonstrated that, with ATO-alone treatment, the survival fractions of irradiated PC-3 cells were significantly decreased. Meanwhile, the apoptosis rate of the irradiated cells increased significantly (P<0.05). The ROS levels of the study group decreased obviously before irradiation (P<0.01), however, the radiation-induced ROS of the study group was at a high level even when irradiation had been terminated for 2 h (P<0.01). Moreover, NOX2 and NOX4 levels and total SOD activity decreased (P<0.01), while the levels of SOD1 were stably maintained (P>0.05). On the other hand, the decreased survival fractions and high radiation-induced ROS levels were abrogated by increasing the level of NOXs by gene transfection or by enhancing the ability of SOD utilizing the addition of tempol. In conclusion, ATO enhanced the cell killing effect of irradiation by reducing endogenous ROS levels and prolonging the lifespan of radiation‑induced ROS via a decrease in the level of NOXs and SOD activity.
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Copy and paste a formatted citation
Spandidos Publications style
Yu H, Sun S, Gu X, Wang W and Gao X: Atorvastatin prolongs the lifespan of radiation‑induced reactive oxygen species in PC-3 prostate cancer cells to enhance the cell killing effect. Oncol Rep 37: 2049-2056, 2017.
APA
Yu, H., Sun, S., Gu, X., Wang, W., & Gao, X. (2017). Atorvastatin prolongs the lifespan of radiation‑induced reactive oxygen species in PC-3 prostate cancer cells to enhance the cell killing effect. Oncology Reports, 37, 2049-2056. https://doi.org/10.3892/or.2017.5447
MLA
Yu, H., Sun, S., Gu, X., Wang, W., Gao, X."Atorvastatin prolongs the lifespan of radiation‑induced reactive oxygen species in PC-3 prostate cancer cells to enhance the cell killing effect". Oncology Reports 37.4 (2017): 2049-2056.
Chicago
Yu, H., Sun, S., Gu, X., Wang, W., Gao, X."Atorvastatin prolongs the lifespan of radiation‑induced reactive oxygen species in PC-3 prostate cancer cells to enhance the cell killing effect". Oncology Reports 37, no. 4 (2017): 2049-2056. https://doi.org/10.3892/or.2017.5447
Copy and paste a formatted citation
x
Spandidos Publications style
Yu H, Sun S, Gu X, Wang W and Gao X: Atorvastatin prolongs the lifespan of radiation‑induced reactive oxygen species in PC-3 prostate cancer cells to enhance the cell killing effect. Oncol Rep 37: 2049-2056, 2017.
APA
Yu, H., Sun, S., Gu, X., Wang, W., & Gao, X. (2017). Atorvastatin prolongs the lifespan of radiation‑induced reactive oxygen species in PC-3 prostate cancer cells to enhance the cell killing effect. Oncology Reports, 37, 2049-2056. https://doi.org/10.3892/or.2017.5447
MLA
Yu, H., Sun, S., Gu, X., Wang, W., Gao, X."Atorvastatin prolongs the lifespan of radiation‑induced reactive oxygen species in PC-3 prostate cancer cells to enhance the cell killing effect". Oncology Reports 37.4 (2017): 2049-2056.
Chicago
Yu, H., Sun, S., Gu, X., Wang, W., Gao, X."Atorvastatin prolongs the lifespan of radiation‑induced reactive oxygen species in PC-3 prostate cancer cells to enhance the cell killing effect". Oncology Reports 37, no. 4 (2017): 2049-2056. https://doi.org/10.3892/or.2017.5447
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