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Throughout life a person is inevitably exposed to low doses of ionizing radiation (LDIR) both background radiation and as part of medical treatment and diagnostics, during professional activities, air travel etc. Today the effects of LDIR and the risks of long-term consequences of this impact are increasingly attracting the researchers attention. On the one hand, scientists point to the development of negative consequences, in particular, the accumulation of double-stranded breaks DNA, on the other hand, some studies demonstrating the development of such events as hormesis and adaptive response. Based on this, there is an assumption that in the range of LDIR may exist a non-linear dependence of the effects on the radiation dose, i.e. the effect isn’t proportional to the received dose and that is consistent with the threshold-concept. Today many scientific papers are devoted to this area of research. Special attention is drawn to the effects LDIR on human mesenchymal stromal cells (MSCs) because they are the regenerative reserve of the body. Due to the them ability to self-sustain MSCs can stay in the body for a long time and undergo several rounds of irradiation, accumulating the changes in themselves and passing ones to the next generations of cells since they have the potential to the differentiation. Thus, changes that have occurred in the MSCs affect the human body as a whole. Based on all of the above, it can be concluded that the study of the effects of LDIR on mesenchymal stromal cells of human is actual area of research currently.

Human Mesenchymal Stromal Cells: Characteristics, Radiosensitivity and Effects of Low-Dose Radiation