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|Molar mass||416.63 g/mol|
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
24,25-Dihydroxycholecalciferol, also known as 24,25-dihydroxyvitamin D3 and (24R)-hydroxycalcidiol (abbreviated as 24(R),25-(OH)2D3), is a compound which is closely related to 1,25-dihydroxyvitamin D3, the active form of vitamin D3, but like vitamin D3 itself and 25-hydroxyvitamin D3 is inactive as a hormone both in vitro and in vivo. It was identified by Michael F. Holick.
Formation and significance
24,25-dihydroxyvitamin D3 is formed from 25-hydroxyvitamin D3 by the action of P450cc24 (25-hydroxyvitamin D3-24-hydroxylase), which appears to be "a multicatalytic enzyme catalyzing most, if not all, of the reactions in the C-24/C-23 pathway of 25-OH-D3 metabolism." It has been proposed that 24,25-dihydroxyvitamin D3 is a metabolite of 25-hydroxyvitamin D3 which is destined for excretion.
It is not known whether the compound might also have some physiologically significant activity. Some evidence of a possible receptor has been obtained.
Interactive pathway map
Click on genes, proteins and metabolites below to link to respective articles. [§ 1]
- The interactive pathway map can be edited at WikiPathways: "VitaminDSynthesis_WP1531".
- "Nomenclature of Vitamin D. Recommendations 1981. IUPAC-IUB Joint Commission on Biochemical Nomenclature (JCBN)" reproduced at the Queen Mary, University of London website. Retrieved 21 March 2010.
- Sørnes, S.; Bjøro, T.; Berg, J. P.; Torjesen, P. A.; Haug, E. (1994). "Calcitriol attenuates the basal and vasoactive intestinal peptide-stimulated cAMP production in prolactin-secreting rat pituitary (GH4C1) cells". Molecular and cellular endocrinology 101 (1–2): 183–188. PMID 9397951.
- Mortensen, B. M.; Gautvik, K. M.; Gordeladze, J. O. (1993). "Bone turnover in rats treated with 1,25-dihydroxyvitamin D3, 25-hydroxyvitamin D3 or 24,25-dihydroxyvitamin D3". Bioscience reports 13 (1): 27–39. PMID 8392394.
- Holick, MF; Schnoes, HK; Deluca, HF; Gray, RW; Boyle, IT; Suda, T (1972). "Isolation and identification of 24,25-dihydroxycholecalciferol, a metabolite of vitamin D made in the kidney". Biochemistry 11 (23): 4251–5. doi:10.1021/bi00773a009. PMID 4342902.
- Beckman, M. J.; Tadikonda, P.; Werner, E.; Prahl, J.; Yamada, S.; Deluca, H. F. (1996). "Human 25-Hydroxyvitamin D3-24-Hydroxylase, a Multicatalytic Enzyme†". Biochemistry 35 (25): 8465–8472. doi:10.1021/bi960658i. PMID 8679605.
- Sömjen, D.; Sömjen, G. J.; Weisman, Y.; Binderman, I. (1982). "Evidence for 24,25-dihydroxycholecalciferol receptors in long bones of newborn rats". The Biochemical journal 204 (1): 31–36. PMC 1158312. PMID 6981414.
- Mata-Granados, J. M.; Luque De Castro, M. D.; Quesada Gomez, J. M. (2008). "Inappropriate serum levels of retinol, α-tocopherol, 25 hydroxyvitamin D3 and 24,25 dihydroxyvitamin D3 levels in healthy Spanish adults: Simultaneous assessment by HPLC". Clinical Biochemistry 41 (9): 676–680. doi:10.1016/j.clinbiochem.2008.02.003. PMID 18313404.