SHP-1 overexpression increases the radioresistance of NPC cells by enhancing DSB repair, increasing S phase arrest and decreasing cell apoptosis

  • Authors:
    • Xiaofen Pan
    • Jingjing Mou
    • Sha Liu
    • Ziyi Sun
    • Rui Meng
    • Zhenwei Zhou
    • Gang Wu
    • Gang Peng
  • View Affiliations

  • Published online on: April 28, 2015     https://doi.org/10.3892/or.2015.3939
  • Pages: 2999-3005
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Abstract

The present study aimed to investigate the influence of SHP-1 on the radioresistance of the nasopharyngeal carcinoma (NPC) cell line CNE-2 and the relevant underlying mechanisms. The human NPC cell line CNE-2 was transfected with a lentivirus that contained the SHP-1 gene or a nonsense sequence (referred to as LP-H1802Lv201 and LP-NegLv201 cells, respectively). Cells were irradiated with different ionizing radiation (IR) doses. Cell survival, DNA double-strand breaks (DSBs), apoptosis, cell cycle distribution, and the expression of related proteins were assessed using colony formation assay, immunofluorescent assays (IFAs), flow cytometry (FCM) and western blot analyses, respectively. Compared with the control (CNE-2 cells) and LP-NegLv201 cells, LP-H1802Lv201 cells were more resistant to IR. IFAs showed that IR caused less histone H2AX phosphorylation (γH2AX) and RAD51 foci in the LP-H1802Lv201 cells. Compared with the control and LP-NegLv201 cells, LP-H1802Lv201 cells showed increased S phase arrest. After IR, the apoptotic rate of the LP-H1802Lv201 cells was lower in contrast to the control and LP-NegLv201 cells. Western blot analyses showed that IR increased the phosphorylation of ataxia telangiectasia mutated (ATM) kinase, checkpoint kinase 2 (CHK2), ataxia telangiectasia and Rad3‑related (ATR) protein, checkpoint kinase 1 (CHK1) and p53. In LP-H1802Lv201 cells, the phosphorylation levels of ATM and CHK2 were significantly increased while the p53 phosphorylation level was decreased compared to these levels in the control and LP-NegLv201 cells. Phosphorylation of ATR and CHK1 did not show significant differences in the three cell groups. Overexpression of SHP-1 in the CNE-2 cells led to radioresistance and the radioresistance was related to enhanced DNA DSB repair, increased S phase arrest and decreased cell apoptosis.
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June-2015
Volume 33 Issue 6

Print ISSN: 1021-335X
Online ISSN:1791-2431

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Spandidos Publications style
Pan X, Mou J, Liu S, Sun Z, Meng R, Zhou Z, Wu G and Peng G: SHP-1 overexpression increases the radioresistance of NPC cells by enhancing DSB repair, increasing S phase arrest and decreasing cell apoptosis. Oncol Rep 33: 2999-3005, 2015
APA
Pan, X., Mou, J., Liu, S., Sun, Z., Meng, R., Zhou, Z. ... Peng, G. (2015). SHP-1 overexpression increases the radioresistance of NPC cells by enhancing DSB repair, increasing S phase arrest and decreasing cell apoptosis. Oncology Reports, 33, 2999-3005. https://doi.org/10.3892/or.2015.3939
MLA
Pan, X., Mou, J., Liu, S., Sun, Z., Meng, R., Zhou, Z., Wu, G., Peng, G."SHP-1 overexpression increases the radioresistance of NPC cells by enhancing DSB repair, increasing S phase arrest and decreasing cell apoptosis". Oncology Reports 33.6 (2015): 2999-3005.
Chicago
Pan, X., Mou, J., Liu, S., Sun, Z., Meng, R., Zhou, Z., Wu, G., Peng, G."SHP-1 overexpression increases the radioresistance of NPC cells by enhancing DSB repair, increasing S phase arrest and decreasing cell apoptosis". Oncology Reports 33, no. 6 (2015): 2999-3005. https://doi.org/10.3892/or.2015.3939