Accession NumberHMDB06720
Common_Name23S,25-dihydroxyvitamin D3
Description23S,25-dihydroxyvitamin D3 (23S,25-(OH)2D3) is a circulating metabolite of vitamin D3 during vitamin D excess. During hypocalcemia or hypovitaminosis D, 25-OH-D3 is 1alpha-hydroxylated, primarily in kidney, to produce 1,25-(OH)2D3. 1,25-(OH)2D3 is a hormonally active form of vitamin D3 that enhances intestinal calcium transport and promotes mobilization of calcium from bone. In states of vitamin D excess, other pathways of 25-OH-D3 metabolism emerge as alternatives to 1-and 24-hydroxylation. Recently, 25-hydroxyvitamin D3-26,23-lactone (lactone) was identified as a major plasma metabolite in animals receiving large doses of vitamin D. Although the function of the lactone is not known, its 5-fold greater potency of binding to the plasma vitamin D carrier protein, relative to 25-OH-D3, suggests that it may, perhaps indirectly, contribute to vitamin D toxicity. This indicates the existence of an alternate route to lactone formation through a new 25-OH-D3 metabolite, 23,25-(OH)2D3. (PMID: 6286629)
Chemical_IUPAC_Name(6R)-6-[(1R,3aR,4E,7aR)-4-[(2Z)-2-[(5R)-5-hydroxy-2-methylidene-cyclohexylidene]ethylidene]-7a-methyl-2,3,3a,5,6,7-hexahydro-1H-inden-1-yl]-2-methyl-heptane-2,4-diol
Chemical FormulaC27H44O3
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