Abstract
Background
Response to chemotherapy varies widely in patients with advanced oesophageal cancer. We investigated the impact of manipulating certain microRNAs on response to cisplatin and 5-fluorouracil (5-FU) in oesophageal cancer cells.
Methods
Cisplatin-/5-fluorouracil-resistant oesophageal squamous cell carcinoma (SCC) and adenocarcinoma (EAC) cell lines were established, and the impact of ectopic upregulation of miR-106a and miR-148a on response to both drugs was assessed.
Results
The impact of miR-106a-upregulation was inconsistent. Upregulation was followed by reduced sensitivity to cisplatin in chemotherapy-sensitive EAC cells (cell survival, +8.7 ± 0.8%; p = 0.003) and an improved response to 5-FU in cisplatin-resistant EAC cells (cell survival, −6.4 ± 2.5%; p = 0.011). MiR-148a upregulation significantly increased sensitivity to chemotherapy in seven out of ten cell lines, represented by a decrease in cell viability of 22.6 ± 7.9% to 50.5 ± 10.6% after cisplatin (p ≤ 0.014) and 6.0 ± 0.8% to 15.0 ± 4.1% after 5-FU treatment (p ≤ 0.012). The only cell lines in which miR-148a upregulation had no effect were cisplatin-resistant EAC exposed to cisplatin and 5-FU-sensitive and 5-FU-resistant SCC cells exposed to 5-FU.
Conclusion
MiR-148a sensitized chemotherapy-sensitive oesophageal cancer cell lines to cisplatin and, to a lesser extent, to 5-flurouracil and attenuated resistance in chemotherapy-resistant variants. Further experimental and clinical studies to investigate the exact mechanisms involved are warranted.
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Acknowledgments
We thank Prof. Dr. M Bruewer for his support in planning and performing the current study. Dr Richard Hummel was supported by a Research Fellowship of the German Research Foundation (DFG) to R.H. (Hu 1763/1-1). Funding was also obtained from a project grant from the National Health and Medical Research Council of Australia (grant no. 595964).
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Part of the results reported in this paper have been presented at the 12th World Congress of the International Society for Diseases of the Esophagus, Japan, September 2010, and published in abstract form as: Impact of miRNAs on sensitivity to anticancer treatment in sensitive and resistant esophageal squamous cell carcinoma cell lines. Dis Esophagus. 2010 Aug;23 Suppl 1:48A-49A
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Hummel, R., Watson, D.I., Smith, C. et al. Mir-148a Improves Response to Chemotherapy in Sensitive and Resistant Oesophageal Adenocarcinoma and Squamous Cell Carcinoma Cells. J Gastrointest Surg 15, 429–438 (2011). https://doi.org/10.1007/s11605-011-1418-9
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DOI: https://doi.org/10.1007/s11605-011-1418-9