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- W2071738174 abstract "The sensitive period and the dose-response characteristics for dexametha-sone-induced cleft palate and palatal slit in rats were examined. Pregnant rats were injected subcutaneously with dexamethasone in a single dose of 2–6 mg/kg on one day between day 8 and 16 of the gestational period or once each day for two successive days (days 14 and 15 of gestation). All animals were euthanized on day 20 of gestation and the palatal condition of their fetuses was inspected after fixation under a dissecting microscope. The sensitive stage of palatal slit and cleft palate induction was determined and the dose-response relationship was analyzed by the log-probit transformation method. No maternal lethality was elicited in any of the treatment groups. High frequencies of palatal slit and cleft palate were induced when dexamethasone was administered as a single dose on any individual day from day 12 to day 14 of gestation. Omphalocele and general edema were also found to be significantly more frequent in the high-dose group treated on days 12–14 of gestation. All groups treated showed a reduction in fetal body weight. The response data for palatal slit and cleft palate after administration of dexamethasone fitted to similar linear regression slopes, suggesting a similarity in the underlying mechanisms for palatal slit and cleft palate induction in rats. ED50 values were 3.48 mg/kg for palatal slit and 6.64 mg/kg for cleft palate. These findings indicate that dexamethasone treatment is effective in inducing palatal slit and cleft palate in rats, as well as in mice. Key words: glucocorticoid, dexamethasone, palatal slit, cleft palate, sensitive stage, doseresponse, rats" @default.
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- W2071738174 date "1993-06-01" @default.
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- W2071738174 title "Palatal Slit and Cleft Palate in Rats Treated with a Glucocorticoid 1. Teratogenicity of Dexamethasone" @default.
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- W2071738174 doi "https://doi.org/10.1111/j.1741-4520.1993.tb00521.x" @default.
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