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- W2068806799 abstract "Diploid human fibroblasts (IMR-90 cells), grown to confluency and growth-arrested by serum starvation, were irradiated with a variety of doses of UV light (0.025–40 J/m2) or incubated with broad dose ranges of four direct-acting mutagens [ethyl methanesulfonate (EMS), ICR-170, methyl methanesulfonate (MMS), and 4-nitroquinoline oxide (4-NQO)] and pulsed with a thymidine analog, 5-bromodeoxyuridine (BrdUrd) to detect evidence of DNA repair. These cells and appropriate controls were immunochemically stained and subjected to flow cytometric analysis to quantify BrdUrd incorporation into DNA and simultaneously measure cellular DNA content. Since the maximal quantity of BrdUrd incorporated with repairing cells is profoundly less than the amount incorporated during replicative synthesis and flow cytometric analysis collects information on a cell-to-cell basis, data collection using linear histograms succeeded both in revealing repairing cellular populations and eliminating replicative cells from the analysis. Technical modifications necessary to achieve stoichiometry with UV-irradiated IMR-90 fibroblasts included a 48h repair (and pulse) period, followed by denaturing cellular DNA for 15 min at 90°C. The limit of detection was equal to or below the lowest dose investigated (0.025 J/m2). DNA repair was also detected with cultures incubated with low doses of all chemicals and pulsed with BrdUrd for a 24 h period. The limits of detection were near or below 500 m̈M EMS, 5 m̈M MMS, 0.25 m̈M 4-NQO, and 0.1 m̈M ICR-170. © 1993 Wiley-Liss, Inc." @default.
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- W2068806799 date "1993-01-01" @default.
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- W2068806799 title "Statistical confirmation that immunofluorescent detection of DNA repair in human fibroblasts by measurement of bromodeoxyuridine incorporation is stoichiometric and sensitive" @default.
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- W2068806799 doi "https://doi.org/10.1002/cyto.990140207" @default.
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