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- W2161689969 abstract "Abstract The vitamin D analog ED-71 [1α,25-dihydroxy-2β-(3-hydroxypropyloxy)vitamin D3] has been approved for treatment of osteoporosis in Japan, but its effects on mineral metabolism have not been fully explored. We investigated the actions of ED-71 on phosphate (Pi) absorption and induction of the intestinal sodium/phosphate cotransporters. Oral treatment of vitamin D-deficient rats with ED-71 (20 pmol every other day for 8 d) produced a maximal 8-fold increase in duodenal Pi absorption, measured by the in situ loop method, whereas 1,25-dihyroxyvitamin D3 [1,25(OH)2D3], at doses up to 150 pmol, had no effect. This action of ED-71 was attributable to a dramatic 24-fold induction of sodium-dependent Pi transporter type IIb (NaPi-IIb) mRNA in the duodenum; Pit-1 and Pit-2 mRNA levels were not increased. In vitamin D-replete rats, ED-71 treatment (50 pmol) at 72 and 24 h before death increased NaPi-IIb mRNA in the duodenum and jejunum, but not the ileum, whereas 1,25(OH)2D3 at 1000 pmol was ineffective in all segments. Single oral doses of ED-71 increased mouse intestinal NaPi-IIb mRNA and protein between 6 and 24 h. Surprisingly, rat lung NaPi-IIb was not increased by ED-71, despite its coexpression with the vitamin D receptor in alveolar type II cells. However, ED-71 did not induce intestinal NaPi-IIb in vitamin D receptor-ablated mice. The greater potency of ED-71 than 1,25(OH)2D3 on NaPi-IIb appears to be due to much higher and more prolonged levels of ED-71 in the circulation. In summary, ED-71, due to its disparate pharmacokinetics, is a much more potent inducer of intestinal Pi absorption and NaPi-IIb than 1,25(OH)2D3, suggesting a role for this analog in the treatment of Pi-wasting disorders." @default.
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- W2161689969 date "2012-11-01" @default.
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- W2161689969 title "The Vitamin D Analog ED-71 Is a Potent Regulator of Intestinal Phosphate Absorption and NaPi-IIb" @default.
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- W2161689969 doi "https://doi.org/10.1210/en.2012-1587" @default.
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