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Involvement of miR-155/FOXO3a and miR-222/PTEN in acquired radioresistance of colorectal cancer cell line

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Abstract

Purpose

Finding a novel biomarker for determining the radiosensitivity of colorectal cancer (CRC) is critical. The aim of this study is to evaluate the role of two main miRNAs including miR-222 and miR-155 in radiation response of CRC.

Materials and methods

The radioresistant CRC cell lines were established by exposing the HCT 116 cell line to fractional X-ray radiation. SubG1 fraction analysis, MTT and clonogenic assays were applied to evaluate acquired radioresistant cell line radiosensitivity. miR-222/PTEN and miR-155/FOXO3a expressions were detected by RT PCR.

Results

The clonogenic assay and sub-G1fraction analysis indicated that the RR2 sub-line was significantly more resistant than the parental cell line. MiR-222 and miR-155 were significantly upregulated in the radioresistant cell lines compared with the parental cell lines. The PTEN and FOXO3a expressions in the radioresistant cell lines were significantly higher than in the parental line.

Conclusion

These observations indicate that miR-222 and miR-155 could induce radiation resistance in colorectal cancer by targeting PTEN and FOXO3a genes, respectively. Therefore, miR-222 and miR-155 can be suggested as good biomarkers of CRC radiation response.

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Acknowledgements

This study has been adapted from MSc and PhD theses at Hamadan University of Medical Sciences.

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Author notes

  1. Hamed Manoochehri Khoshinani and Saeid Afshar contributed equally to this work.

Authors and Affiliations

  1. Research Center for Molecular Medicine, Hamedan University of Medical Sciences, Hamadan, Iran

    Hamed Manoochehri Khoshinani, Saeid Afshar, Ali Mahdavinezhad, Rezvan Najafi, Razieh Amini & Massoud Saidijam

  2. Mahdieh Radiotherapy and Brachytherapy Charitable Center, Hamadan, Iran

    Abdolazim Sedighi Pashaki, Mohammad Hadi Gholami & Alireza khoshghadam

  3. Department of Medical Physics, Hamadan University of Medical Sciences, Hamadan, Iran

    Safora Nikzad

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  1. Hamed Manoochehri Khoshinani
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  2. Saeid Afshar
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Correspondence to Massoud Saidijam.

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Funding

The study was funded by Vice-chancellor for Research and Technology, Hamadan University of Medical Sciences (Nos. 9412257365 and 9411136348).

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Khoshinani, H.M., Afshar, S., Pashaki, A.S. et al. Involvement of miR-155/FOXO3a and miR-222/PTEN in acquired radioresistance of colorectal cancer cell line. Jpn J Radiol 35, 664–672 (2017). https://doi.org/10.1007/s11604-017-0679-y

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