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Vitamin D and Bone

Current Osteoporosis Reports volume 10, pages 151–159 (2012)Cite this article

Abstract

All cells comprising the skeleton—chondrocytes, osteoblasts, and osteoclasts—contain both the vitamin D receptor and the enzyme CYP27B1 required for producing the active metabolite of vitamin D, 1,25 dihydroxyvitamin D. Direct effects of 25 hydroxyvitamin D and 1,25 dihydroxyvitamin D on these bone cells have been demonstrated. However, the major skeletal manifestations of vitamin D deficiency or mutations in the vitamin D receptor and CYP27B1, namely rickets and osteomalacia, can be corrected by increasing the intestinal absorption of calcium and phosphate, indicating the importance of indirect effects. On the other hand, these dietary manipulations do not reverse defects in osteoblast or osteoclast function that lead to osteopenic bone. This review discusses the relative importance of the direct versus indirect actions of vitamin D on bone, and provides guidelines for the clinical use of vitamin D to prevent/treat bone loss and fractures.

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Disclosure

Conflicts of interest: D.D. Bikle: has received grant support from the National Institutes of Health (RO1 DK054793, AR055924, and AR050023); and receives loyalties from Lange textbook chapter.

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  1. University of California, San Francisco, San Francisco, CA, USA

    Daniel D. Bikle

  2. San Francisco VA Medical Center, 4150 Clement St (111N), San Francisco, CA, 94121, USA

    Daniel D. Bikle

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Bikle, D.D. Vitamin D and Bone. Curr Osteoporos Rep 10, 151–159 (2012). https://doi.org/10.1007/s11914-012-0098-z

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Keywords

  • Vitamin D
  • Vitamin D receptor
  • CYP27B1
  • 25hydroxyvitamin
  • 1,25 dihydroxyvitamin D
  • 24,25 dihydroxyvitamin D
  • Bone
  • Chondrocytes
  • Osteoblasts
  • Osteoclasts