miR-155, miR-21, and let-7a Expressions in MCF-10A and MCF-7 Cell Lines after Low to High Dose Irradiation

Zare, Afsaneh; Fardid, Reza; Tamadon, Gholam Hossein; Mosleh-Shirazi, Mohammad Amin

doi:10.22074/cellj.2021.7411

miR-155, miR-21, and let-7a Expressions in MCF-10A and MCF-7 Cell Lines after Low to High Dose Irradiation

Document Type : Original Article

Authors

¹ .Department of Radiology, School of Paramedical Sciences, Shiraz University of Medical Sciences, Shiraz, Iran

² .Department of Radiology, School of Paramedical Sciences, Shiraz University of Medical Sciences, Shiraz, Iran;.Ionizing and Non-Ionizing Radiation Protection Research Centre, School of Paramedical Sciences, Shiraz University of Me

³ .Department of Laboratory Sciences, School of Paramedical Sciences, Shiraz University of Medical Sciences, Shiraz, Iran;4.Diagnostic Laboratory Sciences and Technology Research Centre, School of Paramedical Sciences, Shiraz Univer

⁴ .Ionizing and Non-Ionizing Radiation Protection Research Centre, School of Paramedical Sciences, Shiraz University of Medical Sciences, Shiraz, Iran;5.Physics Unit, Department of Radio-Oncology, School of Medicine, Shira

10.22074/cellj.2021.7411

Abstract

Objective
Ionizing radiation is a tremendous risk factor for cancer development. MicroRNAs (miRNAs) are regulators that utilize cell pathways, which are implicated in human cancer prognosis. In addition, miRNAs respond to anti-cancer therapy and proliferation after irradiation. However, the changes in miRNA expression profiles in response to irradiation have not been comprehensively analysed. The present study was designed to assess potential changes that occur in miRNA expression following irradiation.
Materials and Methods
In this experimental study, we used quantitative real-time polymerase chain reaction (qRT- PCR) to measure the expressions of miR-155, miR-21, and let-7a in MCF-10A (normal breast cells) and MCF-7 (breast cancer cells) six hours after the cells were exposed to five different irradiation doses (50, 100, 400, 2000, and 4000 mGY).
Results
After irradiation from the low to high doses, we observed an upsurge in miR-155 (more than 100%) expression and reduction in let-7a (more than 87%) expression. However, there was an increase and a reduction in miR-21 expression (more than 100%).
Conclusion
Irradiation can play an important role in cancer development in normal breast cells (MCF-10A) at low dose irradiation. However, the results showed little difference at high doses of radiation.

Keywords