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Article Open Access

miR‑495 enhances the efficacy of radiotherapy by targeting GRP78 to regulate EMT in nasopharyngeal carcinoma cells

  • Authors:
    • Xueping Feng
    • Wuwu Lv
    • Shuanglian Wang
    • Qian He
  • View Affiliations / Copyright

    Affiliations: Institute of Medical Sciences, Xiangya Hospital, Central South University, Changsha, Hunan 410078, P.R. China, Institute of Medical Sciences, Xiangya Hospital, Central South University, Changsha, Hunan 410078, P.R. China, Department of Radiation Oncology, Hunan Cancer Hospital and The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, Hunan 410013, P.R. China
    Copyright: © Feng et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Pages: 1223-1232
    |
    Published online on: July 2, 2018
       https://doi.org/10.3892/or.2018.6538
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Abstract

Glucose‑regulated protein 78 (GRP78) was revealed to be associated with the radioresistance of nasopharyngeal carcinoma (NPC) in our previous study. GRP78 is a highly expressed cell surface protein, and holds great promise as a cancer specific target. Its expression may be impacted by the regulation of miRNAs, which may be involved in the radioresistance of NPC. A better understanding of the mechanisms of radioresistance may generate new targets of therapy for NPC patients. The present study was designed to investigate the effect of microRNA targeting GRP78 on the radiosensitivity of NPC. First, we used miRWalk software to predict miRNAs that may interact with GRP78. Subsequently, analysis of miR‑495 and GRP78 expression was performed in the primary tissues of 92 NPC tissues and cell lines by immunohistochemistry and real‑time PCR and the results revealed that miR‑495 expression was lower in radioresistant NPC tissues in comparison to chronic rhinitis tissues, and also lower in radioresistant 5‑8F cells (5‑8F‑IR) in comparison to its parental 5‑8F cells. Notably, we observed an inverse association between the expression miR‑495 and GRP78. Our bioinformatics analysis led to the identification of miR‑495 as the optimal miRNA interacting with GRP78 mRNA. Furthermore, miR‑495 targeting the 3'untranslated region (UTR) of GRP78 was detected by a Dual‑Glo Luciferase Assay system. Finally, we observed that miR‑495 inhibition led to a significant increase in the radioresistance of 5‑8F cells and higher GRP78 expression, which may be involved in epithelial‑mesenchymal transition (EMT) phenotype. miR‑495 targeted the 3'UTR of GRP78 and contributed to the efficacy of radiation therapy in NPC.
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Copy and paste a formatted citation
Spandidos Publications style
Feng X, Lv W, Wang S and He Q: miR‑495 enhances the efficacy of radiotherapy by targeting GRP78 to regulate EMT in nasopharyngeal carcinoma cells. Oncol Rep 40: 1223-1232, 2018.
APA
Feng, X., Lv, W., Wang, S., & He, Q. (2018). miR‑495 enhances the efficacy of radiotherapy by targeting GRP78 to regulate EMT in nasopharyngeal carcinoma cells. Oncology Reports, 40, 1223-1232. https://doi.org/10.3892/or.2018.6538
MLA
Feng, X., Lv, W., Wang, S., He, Q."miR‑495 enhances the efficacy of radiotherapy by targeting GRP78 to regulate EMT in nasopharyngeal carcinoma cells". Oncology Reports 40.3 (2018): 1223-1232.
Chicago
Feng, X., Lv, W., Wang, S., He, Q."miR‑495 enhances the efficacy of radiotherapy by targeting GRP78 to regulate EMT in nasopharyngeal carcinoma cells". Oncology Reports 40, no. 3 (2018): 1223-1232. https://doi.org/10.3892/or.2018.6538
Copy and paste a formatted citation
x
Spandidos Publications style
Feng X, Lv W, Wang S and He Q: miR‑495 enhances the efficacy of radiotherapy by targeting GRP78 to regulate EMT in nasopharyngeal carcinoma cells. Oncol Rep 40: 1223-1232, 2018.
APA
Feng, X., Lv, W., Wang, S., & He, Q. (2018). miR‑495 enhances the efficacy of radiotherapy by targeting GRP78 to regulate EMT in nasopharyngeal carcinoma cells. Oncology Reports, 40, 1223-1232. https://doi.org/10.3892/or.2018.6538
MLA
Feng, X., Lv, W., Wang, S., He, Q."miR‑495 enhances the efficacy of radiotherapy by targeting GRP78 to regulate EMT in nasopharyngeal carcinoma cells". Oncology Reports 40.3 (2018): 1223-1232.
Chicago
Feng, X., Lv, W., Wang, S., He, Q."miR‑495 enhances the efficacy of radiotherapy by targeting GRP78 to regulate EMT in nasopharyngeal carcinoma cells". Oncology Reports 40, no. 3 (2018): 1223-1232. https://doi.org/10.3892/or.2018.6538
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