Journal
NATURE CLINICAL PRACTICE ENDOCRINOLOGY & METABOLISM
Volume 4, Issue 2, Pages 80-90Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncpendmet0716
Keywords
adaptive immunity; autoimmune disease; infection; innate immunity; vitamin D
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Funding
- NIAMS NIH HHS [R01 AR050626-05, R01 AR050626, R01 AR037399-20, R01 AR037399] Funding Source: Medline
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Knowledge about the ability of vitamin D to function outside its established role in skeletal homeostasis is not a new phenomenon. Nonclassical immunomodulatory and antiproliferative responses triggered by active 1,25-dihydroxyvitamin D were first reported more than a quarter of a century ago. It is only in recent years, however, that there has been a significant improvement in our understanding of how these nonclassical effects of vitamin D can influence the pathophysiology and possible prevention of human disease. Three particular strands of evidence have been prominent: firstly, population studies have revised our interpretation of normal vitamin D status in humans, suggesting, in turn, that vitamin D insufficiency is a clinical problem of global proportions; secondly, epidemiology has linked vitamin D status with disease susceptibility and/or mortality; and, thirdly, expression of the machinery required to synthesize 1,25-dihydroxyvitamin D in normal human tissue seems to be much more widespread than originally thought. Collectively, these observations suggest that nonclassical metabolism and response to vitamin D might have a significant role in human physiology beyond skeletal and calcium homeostasis. Specific examples of this will be detailed in the current Review, with particular emphasis on the immunomodulatory properties of vitamin D.
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