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Article

Activation of the phosphorylation of ATM contributes to radioresistance of glioma stem cells

  • Authors:
    • Wei Zhou
    • Mao Sun
    • Guang-Hui Li
    • Yong-Zhong Wu
    • Ying  Wang
    • Fu Jin
    • Yun-Yun Zhang
    • Li Yang
    • Dong-Lin Wang
  • View Affiliations / Copyright

    Affiliations: Chongqing Cancer Institute, Chongqing 400030, P.R. China, Department of Gastroenterology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing 400010, P.R. China, Department of Oncology, Institute for Cancer Research of the People's Liberation Army, Xinqiao Hospital, Third Military Medical University, Chongqing 400037, P.R. China, Department of Radiotherapy, Chongqing Cancer Institute, Chongqing 400030, P.R. China, School of Bioengineering, Chongqing University, Chongqing 400044, P.R. China, Department of Oncology, Chongqing Cancer Institute, Chongqing 400030, P.R. China
  • Pages: 1793-1801
    |
    Published online on: July 11, 2013
       https://doi.org/10.3892/or.2013.2614
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Abstract

Ionizing radiation (IR) is currently the most efficient therapy available for malignant glioma. Unfortunately, this strategy is palliative due to the characteristics of radioresistance of malignant glioma. The aim of our study was to compare glioma stem cells (GSCs) with glioma cells (GCs) to determine whether GSCs are responsible for the radioresistance phenotype and to elucidate whether cell cycle checkpoint proteins are responsible for the radioresistance of GSCs. In this study, CD133 (a marker of brain cancer stem cells) and nestin were co-expressed in GSCs isolated from GCs. The percent of CD133+ cells in GSCs and GCs were >80 and <2%, respectively. Significantly more GSCs survived following 2, 4, 6 and 8 Gy IR than GCs. IR kills cancer cells primarily through DNA double-strand breaks (DSBs). The neutral comet assay is often used to intuitively show the level of DSBs. Significantly fewer GSCs showed DNA damage than GCs following 2 Gy IR. This demonstrated that GSCs are more resistant to in vitro radiation than GCs. Furthermore, activated ataxia telangiectasia mutated (ATM) is essential for the activation of downstream effector kinases, such as checkpoint kinase 2 (Chk2) and p53 which mainly contribute to the proper regulation of IR-induced arrest in the G1 phase. DNA damage induced by IR potently initiated activation of phosphorylation of the ATM, p53 and Chk2 checkpoint proteins. Activation of the phosphorylation of these checkpoint proteins was significantly higher in the GSCs compared to GCs. We found that inhibition of ATM activation induced cell cycle checkpoint defects and increased the rate of apoptosis of GSCs following IR. Our results suggest that GSCs were more resistant to radiation compared to GCs due to high expression of phosphorylated cell cycle checkpoint proteins, and inhibition of ATM could significantly reduce the radioresistance of GSCs and GCs. ATM may represent a source of radioresistance in GSCs and a target of improved radiosensitivity of GSCs.
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Copy and paste a formatted citation
Spandidos Publications style
Zhou W, Sun M, Li G, Wu Y, Wang Y, Jin F, Zhang Y, Yang L and Wang D: Activation of the phosphorylation of ATM contributes to radioresistance of glioma stem cells. Oncol Rep 30: 1793-1801, 2013.
APA
Zhou, W., Sun, M., Li, G., Wu, Y., Wang, Y., Jin, F. ... Wang, D. (2013). Activation of the phosphorylation of ATM contributes to radioresistance of glioma stem cells. Oncology Reports, 30, 1793-1801. https://doi.org/10.3892/or.2013.2614
MLA
Zhou, W., Sun, M., Li, G., Wu, Y., Wang, Y., Jin, F., Zhang, Y., Yang, L., Wang, D."Activation of the phosphorylation of ATM contributes to radioresistance of glioma stem cells". Oncology Reports 30.4 (2013): 1793-1801.
Chicago
Zhou, W., Sun, M., Li, G., Wu, Y., Wang, Y., Jin, F., Zhang, Y., Yang, L., Wang, D."Activation of the phosphorylation of ATM contributes to radioresistance of glioma stem cells". Oncology Reports 30, no. 4 (2013): 1793-1801. https://doi.org/10.3892/or.2013.2614
Copy and paste a formatted citation
x
Spandidos Publications style
Zhou W, Sun M, Li G, Wu Y, Wang Y, Jin F, Zhang Y, Yang L and Wang D: Activation of the phosphorylation of ATM contributes to radioresistance of glioma stem cells. Oncol Rep 30: 1793-1801, 2013.
APA
Zhou, W., Sun, M., Li, G., Wu, Y., Wang, Y., Jin, F. ... Wang, D. (2013). Activation of the phosphorylation of ATM contributes to radioresistance of glioma stem cells. Oncology Reports, 30, 1793-1801. https://doi.org/10.3892/or.2013.2614
MLA
Zhou, W., Sun, M., Li, G., Wu, Y., Wang, Y., Jin, F., Zhang, Y., Yang, L., Wang, D."Activation of the phosphorylation of ATM contributes to radioresistance of glioma stem cells". Oncology Reports 30.4 (2013): 1793-1801.
Chicago
Zhou, W., Sun, M., Li, G., Wu, Y., Wang, Y., Jin, F., Zhang, Y., Yang, L., Wang, D."Activation of the phosphorylation of ATM contributes to radioresistance of glioma stem cells". Oncology Reports 30, no. 4 (2013): 1793-1801. https://doi.org/10.3892/or.2013.2614
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