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MiR-338-5p sensitizes glioblastoma cells to radiation through regulation of genes involved in DNA damage response

Abstract

Glioblastoma multiforme (GBM) is the most aggressive form of brain tumor. Despite radical surgery and radiotherapy supported by chemotherapy, the disease still remains incurable with an extremely low median survival rate of 12–15 months from the time of initial diagnosis. The main cause of treatment failure is considered to be the presence of cells that are resistant to the treatment. MicroRNAs (miRNAs) as regulators of gene expression are involved in the tumor pathogenesis, including GBM. MiR-338 is a brain-specific miRNA which has been described to target pathways involved in proliferation and differentiation. In our study, miR-338-3p and miR-338-5p were differentially expressed in GBM tissue in comparison to non-tumor brain tissue. Overexpression of miR-338-3p with miRNA mimic did not show any changes in proliferation rates in GBM cell lines (A172, T98G, U87MG). On the other hand, pre-miR-338-5p notably decreased proliferation and caused cell cycle arrest. Since radiation is currently the main treatment modality in GBM, we combined overexpression of pre-miR-338-5p with radiation, which led to significantly decreased cell proliferation, increased cell cycle arrest, and apoptosis in comparison to irradiation-only cells. To better elucidate the mechanism of action, we performed gene expression profiling analysis that revealed targets of miR-338-5p being Ndfip1, Rheb, and ppp2R5a. These genes have been described to be involved in DNA damage response, proliferation, and cell cycle regulation. To our knowledge, this is the first study to describe the role of miR-338-5p in GBM and its potential to improve the sensitivity of GBM to radiation.

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Acknowledgments

This work was supported by grants NT13514-4/2012 and NT13581-4/2012 of the Czech Ministry of Health, the project “CEITEC–Central European Institute of Technology” (CZ.1.05/1.1.00/02.0068), and the project MZ CR–RVO (MOU, 00209805).

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Correspondence to Ondrej Slaby.

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Informed consent was obtained from each patient before the treatment.

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Andrej Besse and Jiri Sana contributed equally to this work.

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Besse, A., Sana, J., Lakomy, R. et al. MiR-338-5p sensitizes glioblastoma cells to radiation through regulation of genes involved in DNA damage response. Tumor Biol. 37, 7719–7727 (2016). https://doi.org/10.1007/s13277-015-4654-x

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  • DOI: https://doi.org/10.1007/s13277-015-4654-x

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