Abstract
(23S)-23,25-Dihydroxycholecalciferol was converted into a polar metabolite in a calciferol-deficient chick kidney homogenate. The metabolite was identified as (23S)-1,23,25-trihydroxycholecalciferol by absorbance spectroscopy and mass spectrometry, and by formation of derivatives. (23S)-1,23,25-Trihydroxycholecalciferol was also observed as a 1,25-dihydroxycholecalciferol metabolite in intestinal cells isolated from 1,25-dihydroxycholecalciferol-treated rat. The trihydroxy metabolite was 50-fold less potent than 1,25-dihydroxycholecalciferol in the chick intestinal 1,25-dihydroxycholecalciferol receptor assay.
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