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- W2007155819 abstract "Pregnant mice were treated on gestation Day 11 (E11) with a single dose of either hydroxyurea (HU, 250 mg/kg) or 5-bromo-2′deoxyuridine (BrdU, 500 mg/kg), or with a combination of the two agents. The dams were either allowed to go to term, when the fetuses were examined for cleft palate (CP) and digital anomalies, or killed 24 hr after the treatment. In the latter case, limbs from the embryos of control and treated dams were excised and cultured for 6 days in submerged culture. At the end of the culture period, the limb explants were stained for cartilage. The various cartilaginous components were subsequently analyzed using image analysis methods. CP was observed in 2.4 and 22.9% of the fetuses, respectively, after a single dose of HU or BrdU on E11. Simultaneous HU + BrdU treatment decreased the incidence of BrdU-induced CP to 3.6%, while treatment with BrdU 3 hr after HU resulted in 33.3% CP. In addition, syndactyly and ectrodactyly, not seen after the treatment with either HU or BrdU alone, were observed when the two agents were administered simultaneously, 1 hr apart or with a 3-hr delay. The teratogenic response was enhanced when limbs were cultured for 6 days. Digital anomalies were observed in the limb explants of BrdU-pretreated embryos; such abnormalities were not observed in vivo. Image analysis of cultured limb explants revealed that with HU-3 hr-BrdU pretreatment, the total limb area occupied by the long bones was increased at the cost of the paw area. However, no consistent changes in the shape or form of individual bones were observed. HU and BrdU given together produced a teratogenic response which was significantly different from that observed following the administration of HU or BrdU alone. This is considered to be due to an interference with the incorporation of BrdU in the DNA, since HU is known to block DNA synthesis. When HU was given before BrdU, the effects of BrdU were enhanced, probably due to the reported synchronizing action of HU on dividing cells. We also found that after a similar in utero exposure, the culture conditions themselves enhanced the frequency of teratogenic expression of BrdU." @default.
- W2007155819 created "2016-06-24" @default.
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- W2007155819 date "1985-12-01" @default.
- W2007155819 modified "2023-09-27" @default.
- W2007155819 title "The teratogenic interaction of hydroxyurea and 5-bromodeoxyuridine examined with the aid of limb culture and image analysis" @default.
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- W2007155819 doi "https://doi.org/10.1016/0272-0590(85)90153-8" @default.
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