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DNA‑PKcs inhibitor increases the sensitivity of gastric cancer cells to radiotherapy

  • Authors:
    • Wei Geng
    • Dalong Tian
    • Qiang Wang
    • Shunlin Shan
    • Jianwei Zhou
    • Wenxia Xu
    • Husheng Shan
  • View Affiliations / Copyright

    Affiliations: Yancheng City No. 1 People's Hospital, Yancheng, Jiangsu 224005, P.R. China, Department of Molecular Cell Biology and Toxicology, School of Public Health, Nanjing Medical University, Nanjing, Jiangsu 211166, P.R. China, Cancer Center of The 82nd Hospital of PLA, Huaian, Jiangsu 223001, P.R. China
    Copyright: © Geng et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Pages: 561-570
    |
    Published online on: June 6, 2019
       https://doi.org/10.3892/or.2019.7187
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Abstract

Gastric cancer (GC) is a severe public health problem worldwide, particularly in China. Radiotherapy is the main locoregional treatment for various types of unresectable tumor, including GC. However, many patients fail to respond to radiotherapy due to the intrinsic radioresistance of cancer cells. This study was designed to investigate the effects and potential mechanism of radiosensitization associated with DNA‑dependent protein kinase catalytic subunit (DNA‑PKcs) inhibitor in human GC cell lines in vitro. Among the six GC cell lines (SGC7901, HGC‑27, MKN45, MKN74, BGC823 and MGC803) that were exposed to increasing doses of IR (0, 2, 4, 6 and 8 Gy), the mean lethal dose and quasi‑threshold dose measurements indicated that BGC823 and MGC803 were relatively insensitive to ionizing radiation (IR). IR induced significant elevation of γ H2A histone family member X (γH2AX) in MKN45 cells compared with BGC823 cells. DNA‑PKcs and phospho‑DNA‑PKcs protein levels were increased in BGC823 and MGC803 cells compared with other GC cell lines (SGC7901, HGC‑27, MKN45 and MKN74). DNA‑PKcs inhibition led to increased sensitivity of BGC823 and MGC803 cells to IR. NU7441 increased γH2AX expression in the nuclei of BGC823 cells following IR. Combination of DNA‑PKcs and CK2 inhibition further increased the sensitivity of GC cells to IR. The combination of NU7441 and CX4945 increased γH2AX expression in the nucleus of BGC823 cells following IR compared with treatment with NU7441 alone. Taken together, the findings suggest that DNA‑PKcs inhibitor increased the sensitivity of radioresistant BGC823 and MGC803 cells to radiotherapy through the cleaved‑caspase3/γH2AX signaling pathway, thus presenting a potential treatment method for GC.
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Copy and paste a formatted citation
Spandidos Publications style
Geng W, Tian D, Wang Q, Shan S, Zhou J, Xu W and Shan H: DNA‑PKcs inhibitor increases the sensitivity of gastric cancer cells to radiotherapy. Oncol Rep 42: 561-570, 2019.
APA
Geng, W., Tian, D., Wang, Q., Shan, S., Zhou, J., Xu, W., & Shan, H. (2019). DNA‑PKcs inhibitor increases the sensitivity of gastric cancer cells to radiotherapy. Oncology Reports, 42, 561-570. https://doi.org/10.3892/or.2019.7187
MLA
Geng, W., Tian, D., Wang, Q., Shan, S., Zhou, J., Xu, W., Shan, H."DNA‑PKcs inhibitor increases the sensitivity of gastric cancer cells to radiotherapy". Oncology Reports 42.2 (2019): 561-570.
Chicago
Geng, W., Tian, D., Wang, Q., Shan, S., Zhou, J., Xu, W., Shan, H."DNA‑PKcs inhibitor increases the sensitivity of gastric cancer cells to radiotherapy". Oncology Reports 42, no. 2 (2019): 561-570. https://doi.org/10.3892/or.2019.7187
Copy and paste a formatted citation
x
Spandidos Publications style
Geng W, Tian D, Wang Q, Shan S, Zhou J, Xu W and Shan H: DNA‑PKcs inhibitor increases the sensitivity of gastric cancer cells to radiotherapy. Oncol Rep 42: 561-570, 2019.
APA
Geng, W., Tian, D., Wang, Q., Shan, S., Zhou, J., Xu, W., & Shan, H. (2019). DNA‑PKcs inhibitor increases the sensitivity of gastric cancer cells to radiotherapy. Oncology Reports, 42, 561-570. https://doi.org/10.3892/or.2019.7187
MLA
Geng, W., Tian, D., Wang, Q., Shan, S., Zhou, J., Xu, W., Shan, H."DNA‑PKcs inhibitor increases the sensitivity of gastric cancer cells to radiotherapy". Oncology Reports 42.2 (2019): 561-570.
Chicago
Geng, W., Tian, D., Wang, Q., Shan, S., Zhou, J., Xu, W., Shan, H."DNA‑PKcs inhibitor increases the sensitivity of gastric cancer cells to radiotherapy". Oncology Reports 42, no. 2 (2019): 561-570. https://doi.org/10.3892/or.2019.7187
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