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- W2002159591 abstract "Cell survival parameters and the induction and repair of DNA single-strand breaks were measured in two Chinese hamster ovary cell lines after irradiation with monochromatic UVA radiation of wavelength 365 nm. The radiosensitive mutant cell line EM9 is known to repair ionizing-radiation-induced single-strand breaks (SSB) more slowly than the parent line AA8. EM9 was determined to be 1.7-fold more sensitive to killing by 365-nm radiation than AA8 at the 10% survival level, and EM9 had a smaller shoulder region on the survival curve (alpha = 1.76) than AA8 (alpha = 0.62). No significant differences were found between the cell lines in the initial yields of SSB induced either by gamma-radiation (as determined by alkaline sucrose gradient sedimentation) or by 365-nm UVA (as determined by alkaline elution). For measurement of initial SSB, cells were irradiated at 0.5 degrees C to minimize DNA repair processes. Rejoining of 365-nm induced SSB was measured by irradiating cells at 0.5 degrees C, allowing them to repair at 37 degrees C in full culture medium, and then quantitating the remaining SSB by alkaline elution. The repair of these breaks followed biphasic kinetics in both cell lines. EM9 repaired the breaks more slowly (t1/2 values of 1.3 and 61.3 min) than did AA8 (t1/2 values of 0.9 and 53.3 min), and EM9 also left more breaks unrepaired 90 min after irradiation (24% vs 8% for AA8). Thus, the sensitivity of EM9 to 365-nm radiation correlated with its deficiency in repairing DNA lesions revealed as SSB in alkaline elution.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2002159591 date "1991-02-01" @default.
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- W2002159591 title "CORRELATION BETWEEN CELL SURVIVAL AND DNA SINGLE-STRAND BREAK REPAIR PROFICIENCY IN THE CHINESE HAMSTER OVARY CELL LINES AA8 AND EM9 IRRADIATED WITH 365-nm ULTRAVIOLET-A RADIATION" @default.
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- W2002159591 doi "https://doi.org/10.1111/j.1751-1097.1991.tb03927.x" @default.
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