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Article

RNA interference for epidermal growth factor receptor enhances the radiosensitivity of esophageal squamous cell carcinoma cell line Eca109

  • Authors:
    • Heping Zhang
    • Jiancheng Li
    • Wenfang Cheng
    • Di Liu
    • Cheng Chen
    • Xiaoying Wang
    • Xujing Lu
    • Xifa Zhou
  • View Affiliations / Copyright

    Affiliations: Department of Radiation Oncology, Changzhou Tumor Hospital of Soochow University, Changzhou, Jiangsu 213002, P.R. China, Department of Radiation Oncology, Fujian Provincial Tumor Hospital, Provincial Clinical College of Fujian Medical University, Fuzhou, Fujian 350014, P.R. China
  • Pages: 1495-1500
    |
    Published online on: July 3, 2015
       https://doi.org/10.3892/ol.2015.3456
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Abstract

The present study investigated the effects of small interfering RNAs (siRNAs) specific to the epidermal growth factor receptor (EGFR) gene, on the radiosensitivity of esophageal squamous cell carcinoma cells. EGFR gene siRNAs (EGFR‑siRNA) were introduced into esophageal cancer Eca109 cells using Lipofectamine® 2000. The EGFR messenger (m)RNA expression levels, EGFR protein expression and cell growth were assessed using reverse transcription-polymerase chain reaction analysis, western blot analysis and a Cell Counting Kit‑8 (CCK-8), respectively. In addition, colony assays were used to determine the inhibitory effects of X‑ray radiation on EGFR-silenced cells. EGFR mRNA and protein levels were reduced in the Eca109 cells transfected with EGFR‑siRNA. The relative EGFR mRNA expression levels were reduced to 26.74, 9.52 and 4.61% in Eca109 cells transfected with EGFR‑siRNA1, 2 and 3, respectively. These mRNA levels were significantly reduced compared with the those of the control group (42.44%; P<0.0001). Transfection with siRNA3 resulted in the greatest reduction in EGFR mRNA expression, with an inhibition rate of 85%. The relative EGFR protein expression levels were reduced to 24.05, 34.91 and 34.14% in Eca109 cells transfected with EGFR‑siRNA1, 2 and 3, respectively. These protein levels were significantly reduced compared with those of the control group (78.57%; P<0.0001). Transfection with siRNA1 resulted in the greatest reduction in EGFR protein expression, with an inhibition rate of 72.84%. This reduction in EGFR expression inhibited the proliferation of Eca109 cells, which was identified using the CCK-8 assay. The proliferation inhibition ratio was 28.2%. The cells treated with irradiation in addition to EGFR-siRNA, demonstrated reduced radiobiological parameters (D0, Dq and SF2) compared with those of cells treated with irradiation only, with a sensitization enhancing ratio of 1.5. In conclusion, suppression of EGFR expression may enhance the radiosensitivity of esophageal cancer Eca109 cells and therefore may represent a promising approach for future clinical practice.
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Copy and paste a formatted citation
Spandidos Publications style
Zhang H, Li J, Cheng W, Liu D, Chen C, Wang X, Lu X and Zhou X: RNA interference for epidermal growth factor receptor enhances the radiosensitivity of esophageal squamous cell carcinoma cell line Eca109. Oncol Lett 10: 1495-1500, 2015.
APA
Zhang, H., Li, J., Cheng, W., Liu, D., Chen, C., Wang, X. ... Zhou, X. (2015). RNA interference for epidermal growth factor receptor enhances the radiosensitivity of esophageal squamous cell carcinoma cell line Eca109. Oncology Letters, 10, 1495-1500. https://doi.org/10.3892/ol.2015.3456
MLA
Zhang, H., Li, J., Cheng, W., Liu, D., Chen, C., Wang, X., Lu, X., Zhou, X."RNA interference for epidermal growth factor receptor enhances the radiosensitivity of esophageal squamous cell carcinoma cell line Eca109". Oncology Letters 10.3 (2015): 1495-1500.
Chicago
Zhang, H., Li, J., Cheng, W., Liu, D., Chen, C., Wang, X., Lu, X., Zhou, X."RNA interference for epidermal growth factor receptor enhances the radiosensitivity of esophageal squamous cell carcinoma cell line Eca109". Oncology Letters 10, no. 3 (2015): 1495-1500. https://doi.org/10.3892/ol.2015.3456
Copy and paste a formatted citation
x
Spandidos Publications style
Zhang H, Li J, Cheng W, Liu D, Chen C, Wang X, Lu X and Zhou X: RNA interference for epidermal growth factor receptor enhances the radiosensitivity of esophageal squamous cell carcinoma cell line Eca109. Oncol Lett 10: 1495-1500, 2015.
APA
Zhang, H., Li, J., Cheng, W., Liu, D., Chen, C., Wang, X. ... Zhou, X. (2015). RNA interference for epidermal growth factor receptor enhances the radiosensitivity of esophageal squamous cell carcinoma cell line Eca109. Oncology Letters, 10, 1495-1500. https://doi.org/10.3892/ol.2015.3456
MLA
Zhang, H., Li, J., Cheng, W., Liu, D., Chen, C., Wang, X., Lu, X., Zhou, X."RNA interference for epidermal growth factor receptor enhances the radiosensitivity of esophageal squamous cell carcinoma cell line Eca109". Oncology Letters 10.3 (2015): 1495-1500.
Chicago
Zhang, H., Li, J., Cheng, W., Liu, D., Chen, C., Wang, X., Lu, X., Zhou, X."RNA interference for epidermal growth factor receptor enhances the radiosensitivity of esophageal squamous cell carcinoma cell line Eca109". Oncology Letters 10, no. 3 (2015): 1495-1500. https://doi.org/10.3892/ol.2015.3456
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