JOURNAL DESCRIPTION

The Medical Radiology and Radiation Safety journal ISSN 1024-6177 was founded in January 1956 (before December 30, 1993 it was entitled Medical Radiology, ISSN 0025-8334). In 2018, the journal received Online ISSN: 2618-9615 and was registered as an electronic online publication in Roskomnadzor on March 29, 2018. It publishes original research articles which cover questions of radiobiology, radiation medicine, radiation safety, radiation therapy, nuclear medicine and scientific reviews. In general the journal has more than 30 headings and it is of interest for specialists working in thefields of medicine¸ radiation biology, epidemiology, medical physics and technology. Since July 01, 2008 the journal has been published by State Research Center - Burnasyan Federal Medical Biophysical Center of Federal Medical Biological Agency. The founder from 1956 to the present time is the Ministry of Health of the Russian Federation, and from 2008 to the present time is the Federal Medical Biological Agency.

Members of the editorial board are scientists specializing in the field of radiation biology and medicine, radiation protection, radiation epidemiology, radiation oncology, radiation diagnostics and therapy, nuclear medicine and medical physics. The editorial board consists of academicians (members of the Russian Academy of Science (RAS)), the full member of Academy of Medical Sciences of the Republic of Armenia, corresponding members of the RAS, Doctors of Medicine, professor, candidates and doctors of biological, physical mathematics and engineering sciences. The editorial board is constantly replenished by experts who work in the CIS and foreign countries.

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The two-year impact factor of RISC, according to data for 2017, was 0.439, taking into account citation from all sources - 0.570, and the five-year impact factor of RISC - 0.352.

Medical Radiology and Radiation Safety. 2018. Vol. 63. No. 1. P. 28-34

RADIATION BIOLOGY

DOI: 10.12737/article_5a855c9d5b1211.49546901

3H-Thymidine Influence on DNA Double Strand Breaks Induction in Cultured Human Mesenchymal Stem Cells

N.Yu. Vorobyeva, V.V. Uyba, O.A. Kochetkov, T.A. Astrelina, M.V. Pustovalova, A.K. Grekhova, T.M. Blokhina, E.I. Yashkina, D.I. Kabanov, V.A. Nikitina, Yu.B. Suchkova, I.V. Kobzeva, A.N. Osipov

A.I. Burnasyan Federal Medical Biophysical Center of Federal Medical Biological Agency, Moscow, Russia, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

N.Yu. Vorobyeva – Senior Researcher, PhD Biol.; V.V. Uyba – Head of the Federal Medical Biological Agency of Russia, Dr. Sc. Med., Prof.; O.A. Kochetkov – Head of Lab., PhD Tech.; T.A. Astrelina – Head of Center for Biomedical Technologies, Dr. Sc. Med.; M.V. Pustovalova – Research Fellow; A.K. Grekhova – Junior Researcher; T.M. Blokhina – Research Fellow; E.I. Yashkina – Junior Researcher; D.I. Kabanov – Engineer; V.A. Nikitina – Leading Researcher, PhD Med.; Yu.B. Suchkova – Senior Researcher, PhD Med.; I.V. Kobzeva – Senior Researcher, PhD Med.; A.N. Osipov – Head of Dep., Dr. Biol. Sc., Prof.

Abstract

Purpose: To estimate the impact of 3H-thymidine on DNA double strand breaks (DSBs) induction in cultured human mesenchymal stem cells (MSC).

Material and methods: Isolation and cultivation of human bone marrow MSC was carried out according to a standard procedure. A sterile solution of 3H-thymidine with different specific radioactivity was added to the cell culture and incubated under the conditions of the CO2 incubator for 24 hours. The specific radioactivity of 3H-thymidine in the incubation medium was 50–1600 kBq/ml. To evaluate quantitatively the DSBs, an immunocytochemical analysis of the DSB marker – phosphorylated histone (γH2AX) foci was used. Additionally, the proportion of dividing cells was estimated using an immunocytochemical analysis of the cell proliferation marker, the Ki67 protein.

Results: It was shown that 24 h incubation of human MSC in a culture medium results in a dose-dependent increase in γH2AX foci. There is a linear increase in the foci γH2AX in the range of 50–400 kBq/ml, after which the relative quantitative yield of foci per unit of specific radioactivity begins to decrease. In general, the dose-effect relationship is approximated by the quadratic function y = 3.13 + 50.80x – 12.38x2 (R2 = 0.99), where y is the number of foci γH2AX in the cell nucleus, and x is the specific radioactivity in 1000 kBq/ml. It was found that incubation of human MSC in a culture medium containing 800 and 1600 kBq/ml of 3H-thymidine resulted in a statistically significant decrease in the cells proliferative activity compared to the control of ~1.25 and 1.41 respectively. The peculiar biological limitation of tritium accumulation in the cell nucleus explains well the nonlinear character of the dependence of the formation of DSBs on the specific radioactivity of 3H-thymidine in the culture medium observed in our study.

Conclusion: Quantitative analysis of γH2AX foci has proved to be a highly reproducible and highly sensitive method for evaluating the induction of DSBs in living cells under the action of 3H-thymidine. An analysis of the foci of γH2AX will be useful for accurate estimating the quantitative yield of DBS in living cells per dose of 3H-thymidine β-radiation. To do this, it is necessary to make a correct calculation of the doses received by the cells taking into account the microdistribution of 3H-thymidine in the cell volume and its accumulation in the DNA of living cells.

Key words: 3H-thymidine, DNA double strand breaks, γH2AX foci, mesenchymal stem cells

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For citation: Vorobyeva NYu, Uyba VV, Kochetkov OA, Astrelina TA, Pustovalova MV, Grekhova AK, Blokhina TM, Yashkina EI, Kabanov DI, Nikitina VA, Suchkova YuB, Kobzeva IV, Osipov AN. 3H-Thymidine Influence on DNA Double Strand Breaks Induction in Cultured Human Mesenchymal Stem Cells. Medical Radiology and Radiation Safety. 2018;63(1):28-34. DOI: 10.12737/article_5a855c9d5b1211.49546901. Russian.

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