Int. J. Mol. Sci. 2013, 14(7), 13719-13726; doi:10.3390/ijms140713719
Article

Changes in the Number of Double-Strand DNA Breaks in Chinese Hamster V79 Cells Exposed to γ-Radiation with Different Dose Rates

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Received: 5 June 2013; in revised form: 15 June 2013 / Accepted: 19 June 2013 / Published: 1 July 2013
(This article belongs to the collection Radiation Toxicity in Cells)
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Abstract: A comparative investigation of the induction of double-strand DNA breaks (DSBs) in the Chinese hamster V79 cells by γ-radiation at dose rates of 1, 10 and 400 mGy/min (doses ranged from 0.36 to 4.32 Gy) was performed. The acute radiation exposure at a dose rate of 400 mGy/min resulted in the linear dose-dependent increase of the γ-H2AX foci formation. The dose-response curve for the acute exposure was well described by a linear function y = 1.22 + 19.7x, where “y” is an average number of γ-H2AX foci per a cell and “x” is the absorbed dose (Gy). The dose rate reduction down to 10 mGy/min lead to a decreased number of γ-H2AX foci, as well as to a change of the dose-response relationship. Thus, the foci number up to 1.44 Gy increased and reached the “plateau” area between 1.44 and 4.32 Gy. There was only a slight increase of the γ-H2AX foci number (up to 7) in cells after the protracted exposure (up to 72 h) to ionizing radiation at a dose rate of 1 mGy/min. Similar effects of the varying dose rates were obtained when DNA damage was assessed using the comet assay. In general, our results show that the reduction of the radiation dose rate resulted in a significant decrease of DSBs per cell per an absorbed dose.
Keywords: DNA double-strand breaks; γ-Н2АХ foci; γ-radiation; dose rate effect; V79 cells
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Kotenko, K.V.; Bushmanov, A.Y.; Ozerov, I.V.; Guryev, D.V.; Anchishkina, N.A.; Smetanina, N.M.; Arkhangelskaya, E.Y.; Vorobyeva, N.Y.; Osipov, A.N. Changes in the Number of Double-Strand DNA Breaks in Chinese Hamster V79 Cells Exposed to γ-Radiation with Different Dose Rates. Int. J. Mol. Sci. 2013, 14, 13719-13726.

AMA Style

Kotenko KV, Bushmanov AY, Ozerov IV, Guryev DV, Anchishkina NA, Smetanina NM, Arkhangelskaya EY, Vorobyeva NY, Osipov AN. Changes in the Number of Double-Strand DNA Breaks in Chinese Hamster V79 Cells Exposed to γ-Radiation with Different Dose Rates. International Journal of Molecular Sciences. 2013; 14(7):13719-13726.

Chicago/Turabian Style

Kotenko, Konstantin V.; Bushmanov, Andrey Y.; Ozerov, Ivan V.; Guryev, Denis V.; Anchishkina, Natalya A.; Smetanina, Nadezhda M.; Arkhangelskaya, Ekaterina Y.; Vorobyeva, Natalya Y.; Osipov, Andreyan N. 2013. "Changes in the Number of Double-Strand DNA Breaks in Chinese Hamster V79 Cells Exposed to γ-Radiation with Different Dose Rates." Int. J. Mol. Sci. 14, no. 7: 13719-13726.


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