24,25-Dihydroxyvitamin D-3 and bone metabolism

Citation
Jptm. Van Leeuwen et al., 24,25-Dihydroxyvitamin D-3 and bone metabolism, STEROIDS, 66(3-5), 2001, pp. 375-380
Citations number
84
Categorie Soggetti
Biochemistry & Biophysics
Journal title
STEROIDS
ISSN journal
0039128X → ACNP
Volume
66
Issue
3-5
Year of publication
2001
Pages
375 - 380
Database
ISI
SICI code
0039-128X(200103/05)66:3-5<375:2DABM>2.0.ZU;2-6
Abstract
The 1 alpha -hydroxylated metabolite of 25-hydroxyvitamin D-3, 1,25-dihydro xyvitamin D-3, is the biologically most active metabolite of vitamin D. The 24-hydroxylated metabolites were generally considered as degradation produ cts of a catabolic pathway finally leading to excretion of calcitroic acid. Studies with analogues fluorinated at the C-24 position did not indicate a physiological function for 24R,25(OH)(2)D-3. Nevertheless throughout the y ears various studies showed biologic effects of other metabolites than 1 al pha ,25(OH)(2)D-3. In particular the metabolite 24R,25(OH)(2)D-3 has been f unctionally analyzed, e.g. with respect to a role in normal chicken egg hat chability and effects on chondrocytes in the resting zone of cartilage. Num erous studies have shown the presence of the vitamin D receptor in bone cel ls and effects of 1 alpha ,25(OH)(2)D-3 on bone and bone cells. Also for 24 R,25(OH)(2)D-3 studies have been performed focusing on effects on bone and bone cells. The purpose of this review is to summarize the data regarding 2 4R,25(OH)(2)D-3 and bone and to evaluate its role in bone biology. (C) 2001 Elsevier Science Inc. All rights reserved.