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- W2016206313 abstract "The vitamin D analog 1 alpha-hydroxyvitamin D2 (1 alpha-OHD2) is under development for the treatment of secondary hyperparathyroidism and metabolic bone disease. This analog is metabolized in vivo to the natural active dihydroxylated metabolite of vitamin D2, 1 alpha,25-dihydroxyvitamin D2 [1 alpha,25-(OH)2D2]. To study the metabolism of this analog, an assay involving HPLC separation and purification of metabolites followed by RRA with the vitamin D receptor was developed to quantitate the active metabolites of the analog and the endogenous active metabolite of vitamin D3, 1 alpha,25-(OH)2D3, from the same blood sample. This assay was used to determine blood levels of active dihydroxylated vitamin D compounds in rats and monkeys treated with oral 1 alpha-OHD2. As the circulating 1 alpha,25-(OH)2D2 level increased dose dependently in these rats and monkeys, a concomitant decrease in the endogenous 1 alpha,25-(OH)2D3 was observed. In rats orally administered more than 2.5 micrograms 1 alpha-OHD2/kg.day, a second active metabolite of 1 alpha-OHD2, 1 alpha,24-(OH)2D2, was detected in concentrations similar to those of 1 alpha,25-(OH)2D2. These results indicate that the regulatory control of endogenous vitamin D metabolism as well as analog metabolism must be considered when assessing the therapeutic potential of a vitamin D analog." @default.
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- W2016206313 date "1995-11-01" @default.
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- W2016206313 title "Metabolism of 1 alpha-hydroxyvitamin D2 to activated dihydroxyvitamin D 2 metabolites decreases endogenous 1 alpha, 25-dihydroxyvitamin D 3 in rats and monkeys." @default.
- W2016206313 doi "https://doi.org/10.1210/endo.136.11.7588202" @default.
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