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Identification of heat shock protein 27 as a radioresistance-related protein in nasopharyngeal carcinoma cells

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Abstract

Purpose

To identify the proteins involved in radioresistance in nasopharyngeal cancer (NPC) cells.

Methods

Sublethal ionizing radiation was applied to establish a radioresistant NPC cell line from its parental NPC cell line CNE1. Clonogenic survival assay, cell growth assay and flow cytometry analysis were used to examine the difference of radiosensitivity in the radioresistant CNE1 cells (CNE1-IR) and control CNE1 cells. Comparative proteomics was performed to identify the differential proteins in the two cell lines. Association of HSP27, one of upregulated proteins in CNE1-IR cells, with NPC cell radioresistance was selected for further investigation using antisense oligonucleotides (ASOs), clonogenic survival assay, Hoechst 33258 staining of apoptotic cells and MTT assay of cell viability.

Results

Radioresistant NPC cell line CNE1-IR derived from its parental cell line CNE1 was established. Thirteen differential proteins in the CNE1-IR and CNE1 cells were identified by proteomics, and differential expression of HSP27, one of identified proteins, was selectively confirmed by western blot. Inhibition of HSP27 expression by HSP27 ASOs decreased clonogenic survival and cell viability and increased cell apoptosis of CNE1-IR cells after irradiation, that is, enhanced radiosensitivity of CNE1-IR cells.

Conclusion

The data suggest that HSP27 is a radioresistant protein in NPC cells, and its upregulation may be involved in the NPC radioresistance.

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Acknowledgments

This work was supported by National Nature Science Foundation of China (30973290, 81172559, 81172302), Lotus Scholars Program of Hunan Province, China (2007-362), Key Research Program from Science and Technology Department of Hunan Province, China (2010FJ2009), Nature Science Foundation of Hunan Province, China (11JJ2045).

Conflict of interest

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Authors and Affiliations

  1. Key Laboratory of Cancer Proteomics of Chinese Ministry of Health, Xiangya Hospital, Central South University, Changsha, 410008, China

    Jia-Quan Qu, Hong Yi, Peng-Fei Zhang, Mao-Yu Li, Rong Hu, Xun-Xun Wan, Qiu-Yan He, Jian-Huang Li, Xu Ye, Zhi-Qiang Xiao & Xue-Ping Feng

  2. Department of Histology and Embryology, Xiangya School Medicine, Central South University, Changsha, 410008, China

    Bin Zhang

  3. Department of General Surgery, Xiangya Hospital, Central South University, Changsha, 410008, China

    Liang Xiao

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  1. Bin Zhang
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  2. Jia-Quan Qu
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  4. Hong Yi
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Correspondence to Zhi-Qiang Xiao or Xue-Ping Feng.

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Zhang, B., Qu, JQ., Xiao, L. et al. Identification of heat shock protein 27 as a radioresistance-related protein in nasopharyngeal carcinoma cells. J Cancer Res Clin Oncol 138, 2117–2125 (2012). https://doi.org/10.1007/s00432-012-1293-0

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  • DOI: https://doi.org/10.1007/s00432-012-1293-0

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