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- W1988131724 endingPage "127" @default.
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- W1988131724 abstract "The photodynamic effect of the dye acridine orange (AO) in combination with visible light (400–700 nm) was studied in Chinese hamster ovary (CHO) cells, the endpoints investigated being induction, as well as repair, of DNA strand breaks. Cells were treated for 20 min with AO (0.1–3.0 μg/ml), washed free of excess dye and subsequently exposed to low doses of visible light (2 × 40 W/8 W/m2) for 5–15 min. AO proved to be an efficient sensitizer for light-induced DNA strand breaks, detected with the DNA up to 0.5 μg/ml AO + 10 min of light, which corresponds to 55% precipitated DNA, and was dependent on the concentration of AO as well as on the dose of light delivered. As a comparison, 18 Gy of X-rays was required to yield an equivalent amount of induced DNA strand breaks. The rejoining of the light-induced DNA strand breaks was studied by incubating the AO-sensitized cells for 30–120 min at 37°C directly after light exposure. A fast recovery of 67–91% of the damage (compared to initial damage, recovery time = 0, and dependent on the concentration of AO) was observed during the first 30 min of incubation. However, a significant amount of DNA damage remained after 2 h of recovery. These remaining, long-lived lesions might be involved in the photoinduced and acridine-sensitized chromosomal aberrations and sister-chromatid exchanges (SCE). The significance of these observations is discussed in relation to AO-sensitized and photoinduced DNA damage and chromosomal alterations." @default.
- W1988131724 created "2016-06-24" @default.
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- W1988131724 date "1990-07-01" @default.
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- W1988131724 title "The induction and repair of DNA damage detected by the DNA precipitation assay in Chinese hamster ovary cells treated with acridine orange + visible light" @default.
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- W1988131724 doi "https://doi.org/10.1016/0921-8777(90)90039-8" @default.
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