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- W2130109206 abstract "Purpose: To investigate the effect of small doses of radiation on the cell-cycle and related processes, and to determine the capacity of small doses of radiation to induce an adaptive response. Materials and methods: TK6, a lymphoblast cell line with wild-type p53, and U937, a monocytic leukaemia cell line with mutant, inactive, p53 were exposed to gamma ray doses ranging from 0.1Gy to 3Gy. Cell-cycle distributions and cyclin B1 were assessed by flow cytometry, and p53 and p21 protein levels were measured by Western blotting. Apoptosis was determined by fluorescence microscopy after staining with Hoechst 33342, and by measurement of the pre-G1 cell population by flow cytometry. Micronuclei were determined in cytokinesis-blocked cells by fluorescence microscopy. Results: In TK6 cells, radiation exposure induced elevated p53 and p21 levels and delayed expression of cyclin B1. No changes in these parameters were found in U937 cells. Although both cell lines arrested in G2/M after larger doses of radiation, G2/M-arrest occurred after 0.1Gy and 0.3Gy in TK6 cells only. An apoptotic adaptive response was induced in both cell lines by a 0.1Gy priming dose but an adaptive response with respect to micronuclei was observed only in U937 cells. Conclusions: The radiation adaptive response can occur in the absence of wild-type p53. A small dose of radiation may not protect cells against both apoptosis and cytogenetic damage caused by a subsequent larger dose of radiation." @default.
- W2130109206 created "2016-06-24" @default.
- W2130109206 creator A5042412997 @default.
- W2130109206 date "2000-01-01" @default.
- W2130109206 modified "2023-09-27" @default.
- W2130109206 title "Effects of low dose irradiation on TK6 and U937 cells: induction of p53 and its role in cell-cycle delay and the adaptive response" @default.
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- W2130109206 doi "https://doi.org/10.1080/095530000138961" @default.
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