Document Detail


Isolation, identification and biological activity of 24R,25-dihydroxy-3-epi-vitamin D3: a novel metabolite of 24R,25-dihydroxyvitamin D3 produced in rat osteosarcoma cells (UMR 106).
MedLine Citation:
PMID:  11508700     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
We recently identified 1alpha,25-dihydroxy-3-epi-vitamin D3 [1alpha,25(OH)2-3-epi-D3] as a metabolite of 1alpha,25-dihydroxyvitamin D3 [1alpha,25(OH)2D3] produced in rat osteosarcoma cells (UMR 106). We now report the isolation of 24R,25-dihydroxy-3-epi-vitamin D3 [24R,25(OH)2-3-epi-D3] as a metabolite of 24R,25-dihydroxyvitamin D3 [24R,25(OH)2D3] by high-performance liquid chromatography (HPLC) with chiral column and its structure assignment by proton nuclear magnetic resonance (1H-NMR) and liquid chromatography-mass spectrometry (LC-MS) analysis. We also demonstrated the production of 24R,25(OH)2-3-epi-D, in two other cell lines [human colon carcinoma cells (Caco-2) and porcine kidney cells (LLC-PK1)] which were previously shown to convert 1alpha,25(OH)2D3 into 1alpha,25(OH)2-3-epi-D3. It can be seen that the production of 24R,25(OH)2- 3-epi-D3 from 24R,25(OH)2D3 is lower than that of 1alpha,25(OH)2-3-epi-D3 from 1alpha,25(OH)2D3 in all the cells studied. 24R,25(OH)2-3-epi-D3 was found to be inactive in terms of its ability to bind to the vitamin D receptor (VDR), in inhibiting proliferation and in inducing differentiation of human promyelocytic leukemia cells (HL-60). Thus, our study indicates that the C-3 epimerization pathway is common to both 1alpha,25(OH)2D3 and 24R,25(OH)2D3 and may play an important role in modulating the concentration and the biological activity of these two major vitamin D3 metabolites in target tissues.
Authors:
M Kamao; S Tatematsu; G S Reddy; S Hatakeyama; M Sugiura; N Ohashi; N Kubodera; T Okano
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of nutritional science and vitaminology     Volume:  47     ISSN:  0301-4800     ISO Abbreviation:  J. Nutr. Sci. Vitaminol.     Publication Date:  2001 Apr 
Date Detail:
Created Date:  2001-08-17     Completed Date:  2002-04-04     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0402640     Medline TA:  J Nutr Sci Vitaminol (Tokyo)     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  108-15     Citation Subset:  IM    
Affiliation:
Department of Hygienic Sciences, Kobe Pharmaceutical University, Japan.
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MeSH Terms
Descriptor/Qualifier:
24,25-Dihydroxyvitamin D 3 / metabolism*
Angiogenesis Inhibitors / chemistry,  isolation & purification*,  physiology
Animals
Bone Neoplasms
Caco-2 Cells
Chromatography, High Pressure Liquid
Gas Chromatography-Mass Spectrometry
Humans
Isomerism
Magnetic Resonance Spectroscopy
Osteosarcoma
Swine
Tumor Cells, Cultured
Vitamin D / analogs & derivatives*,  chemistry,  isolation & purification*,  physiology
Grant Support
ID/Acronym/Agency:
DK52488/DK/NIDDK NIH HHS
Chemical
Reg. No./Substance:
0/Angiogenesis Inhibitors; 0/dihydroxy-vitamin D3; 1406-16-2/Vitamin D; 40013-87-4/24,25-Dihydroxyvitamin D 3

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