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• W2070481421 abstract "Mutations in NBS1 gene are related to higher occurrence of malignancies. In this work we studied response of T-lymphocyte leukemia cells MOLT-4 to ionizing radiation. We detected IRIF (ionizing radiation forming foci) containing histone gammaH2A.X, protein 53BP1, and Nbs1, which were formed around double-strand breaks of DNA. We found dose-dependent increase in foci number (colocalization of gammaH2A.X and 53BP1) and gammaH2A.X amount (integral optical density) 1h after irradiation. After the dose of 1.5 Gy the number of foci decreases with time, but 72 h after irradiation 9% of live cells still contained big foci around unrepaired DNA damage. Western blot method revealed massive phosphorylation of H2A.X during apoptosis induction, 6-24 h after irradiation by the doses 1.5 and 3 Gy. Cells with apoptotic morphology showed strong phosphorylation of H2A.X, but it was not accompanied by 53BP1. 1h after irradiation by the lethal doses 5 and 10 Gy we detected by Western blot a decrease in repair proteins Mre11, Rad50, and Nbs1. While phosphorylation of H2A.X 1h after irradiation was detected by both confocal microscopy and Western blot, phosphorylation of Nbs1 on serine 343 was not detectable in MOLT-4 cells. Despite functional ATM and p53 the phosphorylation of Nbs1 on serine 343 was impaired in these cells, and might be responsible for high radiosensitivity of MOLT-4 cells." @default.
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• W2070481421 date "2008-08-01" @default.
• W2070481421 modified "2023-09-30" @default.
• W2070481421 title "Is defect in phosphorylation of Nbs1 responsible for high radiosensitivity of T-lymphocyte leukemia cells MOLT-4?" @default.
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• W2070481421 doi "https://doi.org/10.1016/j.leukres.2007.12.014" @default.
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