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• W2005159969 abstract "TCDD (2,3,7,8-tetrachlorodibenzo-p-dioxin), a highly toxic environmental contaminant, is teratogenic in mice, inducing cleft palate (CP) and hydronephrosis at doses which are not overtly maternally or embryo toxic. Palatal shelves of embryonic mice respond to TCDD, both in vivo and in organ culture, with altered differentiation of medial epithelial cells. By contrast, in the rat TCDD produces substantial maternal, embryonic, and fetal toxicity, including fetal lethality, with few malformations. In this study the possible effects of maternal toxicity on induction of cleft palate were eliminated by exposure of embryonic rat palatal shelves in organ culture. The shelves were examined for specific TCDD-induced alterations in differentiation of the medial cells. On Gestation Day (GD) 14 or 15 palatal shelves from embryonic F344 rats were placed in organ culture for 2 to 3 days (IMEM:F12 medium, 5% FBS, 0.1% DMSO) containing 0, 1 × 10−8, 1 × 10−9, 1 × 10−10, or 5 × 10−11 m TCDD. The medial epithelial peridermal cells degenerated on shelves exposed to control media or 5 × 10−11 m TCDD. Exposure to 10−10, 10−9, and 10−8 m TCDD inhibited this degeneration in 20, 36, and 60% of the shelves, respectively, and was statistically significant at the two highest doses. A normally occurring decrease in [3H]TdR incorporation was inhibited in some GD 15 shelves cultured with 10−10 and 10−9 m TCDD. The medial cells of TCDD-exposed shelves continued to express high levels of immunohistochemically detected EGF receptors. The altered differentiation of rat medial epithelium is similar to that reported for TCDD-exposed mouse medial cells in vivo and in vitro. However, in order to obtain these responses, the cultured rat shelves require much higher concentrations of TCDD than the mouse shelves. Thus TCDD induces the same effects at a cellular level in medial epithelium of rats and mice, but cleft palate is not seen in rats because the level required to produce the cellular effects would result in maternal and embryonic toxicity including fetal lethality." @default.
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• W2005159969 date "1990-05-01" @default.
• W2005159969 modified "2023-09-27" @default.
• W2005159969 title "Rat embryonic palatal shelves respond to TCDD in organ culture" @default.
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• W2005159969 doi "https://doi.org/10.1016/0041-008x(90)90317-n" @default.
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