Document Detail


Not a simple fat-soluble vitamin: Changes in serum 25-(OH)D levels are predicted by adiposity and adipocytokines in older adults.
MedLine Citation:
PMID:  20804516     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVE: To determine the associations between body adiposity and change in serum 25-(OH)D levels over 2.6 years, and if these associations are mediated by metabolic and inflammatory factors in older adults. METHODS: This is a longitudinal study of 859 randomly selected subjects (mean 62 years, range 51-80, 49% women). Serum 25-hydroxyvitamin D [25-(OH)D] was assessed by radioimmunoassay at baseline and 2.6 years later. Baseline serum level of leptin was assessed by radioimmunoassay and interleukin (IL)-6 by a chemiluminescent immunoassay in the first 183 subjects. RESULTS: In multivariable analyses, body mass index, trunk fat percentage and waist-to-hip ratio were significant predictors of increased incident vitamin D deficiency [a 25-(OH)D < 50 nmol L⁻¹ at follow-up when ≥50 nmol L⁻¹ at baseline] and decreased recovery of vitamin D deficiency [a 25-(OH)D ≥ 50 nmol L⁻¹ at follow-up when < 50 nmol L⁻¹ at baseline]. Change in 25-(OH)D levels per annum was also independently predicted by baseline leptin (β: -0.09/unit, 95% CI: -0.17, -0.03), IL-6 (β: -0.68/quartile, 95% CI: -1.35, -0.02) and total cholesterol/high-density lipoprotein (HDL) ratio (β: -0.51, 95% CI: -0.88, -0.14). The associations between body adiposity measures and change in 25-(OH)D completely disappeared after adjustment for leptin, diminished after adjustment for IL-6, but remained unchanged after adjustment for total cholesterol/HDL ratio. All associations were independent of season and sun exposure. CONCLUSIONS: Body fat is not simply a passive reservoir for 25-(OH)D. In addition to season and sun exposure, 25-(OH)D levels appear to be determined by metabolic and, to a lesser extent, inflammatory factors, and these appear to mediate the effects of adiposity on change in 25-(OH)D.
Authors:
C Ding; V Parameswaran; L Blizzard; J Burgess; G Jones
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of internal medicine     Volume:  268     ISSN:  1365-2796     ISO Abbreviation:  J. Intern. Med.     Publication Date:  2010 Nov 
Date Detail:
Created Date:  2010-10-22     Completed Date:  2010-11-12     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8904841     Medline TA:  J Intern Med     Country:  England    
Other Details:
Languages:  eng     Pagination:  501-10     Citation Subset:  IM    
Copyright Information:
© 2010 The Association for the Publication of the Journal of Internal Medicine.
Affiliation:
Menzies Research Institute, University of Tasmania, Hobart, Tas., Australia. changhai.ding@utas.edu.au
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MeSH Terms
Descriptor/Qualifier:
Adiposity / physiology*
Aged
Aged, 80 and over
Aging / physiology*
Body Mass Index
Cohort Studies
Female
Humans
Interleukin-6 / blood*
Leptin / blood*
Longitudinal Studies
Male
Middle Aged
Multivariate Analysis
Radioimmunoassay
Vitamin D / analogs & derivatives*,  blood
Waist-Hip Ratio
Chemical
Reg. No./Substance:
0/Interleukin-6; 0/Leptin; 1406-16-2/Vitamin D; 64719-49-9/25-hydroxyvitamin D

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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