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- W2019600752 abstract "Transabdominal X-rays are a risk factor for childhood leukemia, and X-ray exposure of mouse fetuses has led to increases in both mutations and initiated tumors in offspring. However, fetal sensitivity and dose-response characteristics with regard to transplacental mutagenesis by X-rays have never been quantified. In the current experiment, pregnant Syrian hamsters at day 12 of gestation were irradiated with 300-kV X-rays. Twenty-four hours later, the fetuses were removed and their cells were allowed a 5 day expression time in culture. They were then seeded for colony formation and also for mutation selection by 6-thioguanine (6-TG). Mutation frequency was linear over the entire dose range, 10-600 R. The average induced 6-TG mutant frequency was 4.7 x 10(-7) per R. These results suggest that fetal cells are highly sensitive to induction of mutations by X-rays, and that a no-effect threshold is not likely. The 10 R dose caused a 25-fold increase in mutation frequency over the historical control, 45 x 10(-7) versus 1.8 x 10(-7), an increase per R of 2.5-fold. Increased risk of childhood cancer related to obstetrical transabdominal X-ray has also been estimated at 2.5-fold per R. Thus, our results are consistent with mutation contributing to this effect." @default.
- W2019600752 created "2016-06-24" @default.
- W2019600752 creator A5071594354 @default.
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- W2019600752 date "2002-03-01" @default.
- W2019600752 modified "2023-10-01" @default.
- W2019600752 title "X-ray induced mutation in Syrian hamster fetal cells" @default.
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- W2019600752 doi "https://doi.org/10.1016/s0027-5107(01)00299-8" @default.
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