Vitamin D Activity and Metabolism in Bone.

Abstract:

PURPOSE OF REVIEW:In addition to the actions of the endocrine hormone, 1alpha,25-dihydroxyvitamin D (1,25(OH)2D) in stimulating intestinal calcium absorption, the regulation of bone mineral metabolism by 1,25(OH)2D is also considered an important contributor to calcium homeostasis. However, recent evidence suggest that 1,25(OH)2D acting either via endocrine or autocrine pathways plays varied roles in bone, which suggests that vitamin D contributes to the maintenance of bone mineral in addition to its catabolic roles. This review highlights the contrasting evidence for the direct action for vitamin D metabolism and activity in bone. RECENT FINDINGS:Numerous cells within bone express vitamin D receptor (VDR), synthesise and catabolise 1,25(OH)2D via 25-hydroxyvitamin D 1alpha-hydroxylase (CYP27B1), and 25-hydroxyvitamin D 24-hydroxylase (CYP24A1) enzymes, respectively. Recent evidence suggests that all three genes are required to regulate processes of bone resorption, mineralization and fracture repair. The actions of vitamin D in bone appear to negatively or positively regulate bone mineral depending on the physiological and pathological circumstances, suggesting that vitamin D plays pleiotropic roles in bone.

journal_name

Curr Osteoporos Rep

authors

Anderson PH

doi

10.1007/s11914-017-0394-8

subject

Has Abstract

pub_date

2017-10-01 00:00:00

pages

443-449

issue

5

eissn

1544-1873

issn

1544-2241

pii

10.1007/s11914-017-0394-8

journal_volume

15

pub_type

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