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- W2014682122 abstract "Pregnant rats were maintained on diets either adequate or deficient in vitamin D. On the 20th day of gestation, animals were either nephrectomized bilaterally or sham operated. Immediately thereafter, four groups of nephrectomized or sham-operated pregnant rats received iv [26,27-3H]25-hydroxyvitamin D3 ([26,27-3H]25OHD3),while two groups received [1,2- 3H,4-14C]D3. The animals were sacrificed 10–24 h later. The distribution of the radiolabeled metabolites of vitamin D3 was determined in extracts of maternal plasma, maternal intestinal tract, placentae, and fetuses after Sephadex LH-20 column chromatography. Both vitamin D3 and 25OHD3 crossed the placenta and entered the fetus. In anephric animals receiving [26,27-3H]- 25OHD3, 24,25-dihydroxyvitamin D and a polar peak eluting in the position of 1,25-dihydroxyvitamin D [1,25(OH)2D] and 25,26-dihydroxyvitamin D were identified in extracts of maternal plasma and intestinal tracts and of placentae and fetuses. The identities of 24,25- dihydroxyvitamin D and 1,25(OH)2D were confirmed by high pressure liquid chromatography. In rats receiving [1,2-3H,14C]D3, approximately 50% of the polar metabolite consisted of 1,25(OH)2D. We conclude that the anephric pregnant rat is able to synthesize 1,25(OH)2D, that the fetal portion of the feto-placental unit is the most likely site of production of this hormone, and that this metabolite of vitamin D is able to cross the placenta from the fetus to the mother." @default.
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- W2014682122 date "1978-12-01" @default.
- W2014682122 modified "2023-09-24" @default.
- W2014682122 title "Synthesis of 1,25-Dihydroxyvitamin D in the Nephrectomized Pregnant Rat*" @default.
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- W2014682122 doi "https://doi.org/10.1210/endo-103-6-1992" @default.
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