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Comparative Analysis of the Formation of γH2AX Foci in Human Mesenchymal Stem Cells Exposed to 3H-Thymidine, Tritium Oxide, and X-Rays Irradiation

  • Translated from Kletochnye Tekhnologii v Biologii i Meditsine (Cell Technologies in Biology and Medicine)
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Bulletin of Experimental Biology and Medicine Aims and scope

We performed a comparative study of the formation of γН2АХ foci (a marker of DNA doublestrand breaks) in human bone marrow mesenchymal stem cells after 24-h incubation with 3Н-thimidin and tritium oxide with low specific activities (50-800 MBq/liter). The dependence of the number of γH2AX foci on specific activity of 3H-thymidine was described by a linear equation y=2.21+43.45x (R2=0.96), where y is the number of γH2AX foci per nucleus and x is specific activity in 1000 MBq/liter. For tritium oxide, the relationship was described by a linear equation y=2.52+6.70x (R2=0.97). Thus, the yield of DNA double-strand breaks after exposure to 3H-thymidine was 6.5-fold higher than after exposure to tritium oxide. Comparison of the effects of tritium oxide and X-ray radiation on the yield of DNA double-strand breaks showed that the relative biological efficiency of tritium oxide in a dose range of 3.78-60.26 mGy was 1.6-fold higher than that of X-ray radiation. Improvement of the methods of analysis of DNA double-strand breaks repair foci is highly promising in the context of creation of highly sensitive biodosimetry technologies for tritium compounds in humans.

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Correspondence to A. N. Osipov.

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Translated from Kletochnye Tekhnologii v Biologii i Meditsine, No. 3, pp. 205-208, September, 2018

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Vorob’eva, N.Y., Kochetkov, O.A., Pustovalova, M.V. et al. Comparative Analysis of the Formation of γH2AX Foci in Human Mesenchymal Stem Cells Exposed to 3H-Thymidine, Tritium Oxide, and X-Rays Irradiation. Bull Exp Biol Med 166, 178–181 (2018). https://doi.org/10.1007/s10517-018-4309-1

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  • DOI: https://doi.org/10.1007/s10517-018-4309-1

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