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December-2018 Volume 18 Issue 6

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Article

Long term exposure to γ‑rays induces radioresistance and enhances the migration ability of bladder cancer cells

  • Authors:
    • Guangmin Mao
    • Ye Yao
    • Zhaolu Kong
  • View Affiliations / Copyright

    Affiliations: Department of Radiobiology, Institute of Radiation Medicine, Fudan University, Shanghai 200032, P.R. China, Department of Radiation Oncology, Huadong Hospital, Fudan University, Shanghai 200040, P.R. China
  • Pages: 5834-5840
    |
    Published online on: October 26, 2018
       https://doi.org/10.3892/mmr.2018.9605
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Abstract

In Western countries, bladder cancer (BCa) is one of the most common types of malignancy, with highest incidence rate among urinary system malignancies. At present, as a strategy to preserve the quality and function of the bladder tissues, external‑beam radiotherapy has been applied to an increasing number of patients with BCa, particularly the elderly and those in poor health. The onset of acquired radioresistance (ARR) during radiotherapy notably reduces the effectiveness of radiotherapy; however, the cause of ARR is unclear and remains untreatable. In order to investigate the mechanism of ARR, clinical fractionated irradiation was mimicked in vitro to obtain radioresistant BCa cells, 5637R, in the present study. Compared with the parental cell line, 5637R cells exhibited an increased distribution of S phase cells, enhanced migration ability and elevated levels of phosphorylated‑STAT3, as determined using flow cytometry, cell migration analysis and western blotting, respectively. Furthermore, 5637R cells exhibited notable increases in extracellular signal‑regulated kinase activation in response to ionizing radiation (IR) compared with 5637 cells. In addition, 5637R cells showed an early G2/M arrest within 8 h post‑IR (18.23±3.85 vs. 6.42±3.82%, IR cells vs. control cells), whereas 5637 cells were arrested in G2/M phase 24 h post‑IR (19.26±2.21 vs. 12.36±4.45%, IR cells vs. control cells). Overall, the present study suggested that phosphorylated STAT3 may be a potential biomarker to predict radioresistance and tumor recurrence in patients with BCa following conventional radiotherapeutic intervention. In addition, co‑treatment with ERK inhibitor may be a viable approach to increase the anticancer efficacy of radiotherapy in patients with ARR; however, further investigation is required.
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Copy and paste a formatted citation
Spandidos Publications style
Mao G, Yao Y and Kong Z: Long term exposure to γ‑rays induces radioresistance and enhances the migration ability of bladder cancer cells. Mol Med Rep 18: 5834-5840, 2018.
APA
Mao, G., Yao, Y., & Kong, Z. (2018). Long term exposure to γ‑rays induces radioresistance and enhances the migration ability of bladder cancer cells. Molecular Medicine Reports, 18, 5834-5840. https://doi.org/10.3892/mmr.2018.9605
MLA
Mao, G., Yao, Y., Kong, Z."Long term exposure to γ‑rays induces radioresistance and enhances the migration ability of bladder cancer cells". Molecular Medicine Reports 18.6 (2018): 5834-5840.
Chicago
Mao, G., Yao, Y., Kong, Z."Long term exposure to γ‑rays induces radioresistance and enhances the migration ability of bladder cancer cells". Molecular Medicine Reports 18, no. 6 (2018): 5834-5840. https://doi.org/10.3892/mmr.2018.9605
Copy and paste a formatted citation
x
Spandidos Publications style
Mao G, Yao Y and Kong Z: Long term exposure to γ‑rays induces radioresistance and enhances the migration ability of bladder cancer cells. Mol Med Rep 18: 5834-5840, 2018.
APA
Mao, G., Yao, Y., & Kong, Z. (2018). Long term exposure to γ‑rays induces radioresistance and enhances the migration ability of bladder cancer cells. Molecular Medicine Reports, 18, 5834-5840. https://doi.org/10.3892/mmr.2018.9605
MLA
Mao, G., Yao, Y., Kong, Z."Long term exposure to γ‑rays induces radioresistance and enhances the migration ability of bladder cancer cells". Molecular Medicine Reports 18.6 (2018): 5834-5840.
Chicago
Mao, G., Yao, Y., Kong, Z."Long term exposure to γ‑rays induces radioresistance and enhances the migration ability of bladder cancer cells". Molecular Medicine Reports 18, no. 6 (2018): 5834-5840. https://doi.org/10.3892/mmr.2018.9605
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