Two groups of female rats were treated with dexamethasone phosphate (DEX) for 24 h. One group received DEX in drinking water (10 μg/ml) on the 15th day of pregnancy (DEX15–16), and the second group on the 17th day of pregnancy (DEX17–18). The mothers and fetuses were sacrificed on the 20th and 22nd days of pregnancy. DEX reduced adrenal weights and concentration of corticosterone in plasma of the treated females and their fetuses. Fetal body weight was also reduced. However, the lightest adrenal glands were found in fetuses of the DEX17–18 mothers. Furthermore, the 19-day-old fetuses belonging to the DEX17–18 mothers had smallest amounts of corticosterone in plasma, and in plasma, and their adrenal glands produced the lowest amounts of radioactive corticosterone, 11-deoxycorticosterone and 18-hydroxy-ll-deoxycorticosterone from 4-14C progesterone after 1 h of incubation in vitro. In the 21-day-old fetuses belonging to both the groups of treated mothers, the production of steroids by the adrenal glands was similar and to the same extent reduced in comparison to the control fetuses.
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