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- W1991423165 abstract "Cells respond to radiation-induced DNA damage in a cell cycle phase-specific manner as shown by (1) variation in radiosensitivity across the cell cycle and (2) checkpoints in G1 and G2 phase at which arrest of progression of cells through the phases of the cell cycle occurs. We studied these processes in cells of human glioma cell lines which lack (M059J(PK-)) or express (M059K(PK+)) DNA-dependent protein kinase (DNA-PK) activity. Cell populations enriched with cells of a specific cell cycle phase were y-irradiated and analyzed for cell survival. Although both cell lines were relatively sensitive in G1 phase and resistant in S phase, the differential sensitivity was greater in M059J(PK-) cells. In the studies on checkpoints, unsynchronized cells were irradiated and examined for evidence of cell cycle arrest. Neither cell line showed a postirradiation G1-phase arrest, presumably because of mutant p53 status. For M059J(PK-) cells, all doses tested (2.5-10 Gy) resulted in a significant increase in the proportion of G2/M-phase cells; however, for M059K(PK+) cells, a significant increase in G2/M phase was observed only after 10 Gy. These results suggest that the ability to activate the G2-phase checkpoint remains intact in cells which lack DNA-PK activity." @default.
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- W1991423165 date "1997-03-01" @default.
- W1991423165 modified "2023-10-14" @default.
- W1991423165 title "Intact G 2 -Phase Checkpoint in Cells of a Human Cell Line Lacking DNA-Dependent Protein Kinase Activity" @default.
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- W1991423165 doi "https://doi.org/10.2307/3579334" @default.
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