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- Title
Association between Serum Vitamin D Metabolites and Metabolic Function in Healthy Asian Adults.
- Authors
Ding, Cherlyn; Chan, Zhiling; Chooi, Yu Chung; Choo, John; Sadananthan, Suresh Anand; Michael, Navin; Velan, Sambasivam Sendhil; Leow, Melvin Khee-Shing; Magkos, Faidon
- Abstract
The association between low vitamin D status and the development of type 2 diabetes mellitus is well established; however, intervention trials that increased serum vitamin D (through ultraviolet B exposure or dietary supplementation) provide mixed outcomes. Recent evidence suggests that metabolites directly related to vitamin D receptor activation—1α,25-dihydroxyvitamin D3 and 24R,25-dihydroxyvitamin D3—may be better markers of vitamin D repletion status. We tested the hypothesis that a vitamin D metabolite (VDM) index, calculated as the sum of normalized fasting serum concentrations of 1α,25-dihydroxyvitamin D3 and 24R,25-dihydroxyvitamin D3, is associated with metabolic function. We measured subcutaneous and visceral adipose tissue volume, intrahepatic triglyceride content, maximum oxygen uptake, insulin sensitivity (4 h hyperinsulinemic-euglycemic clamp), and insulin secretion (3 h meal tolerance test with mathematical modeling) and calculated the VDM index in 65 healthy Asian adults. Subjects with a low VDM index had lower peripheral insulin sensitivity and beta-cell function compared to subjects with a high VDM index (both p < 0.05), matched for age, sex, BMI, and serum 25-hydroxyvitamin D3. Serum 25-hydroxyvitamin D3 was not associated with peripheral insulin sensitivity or beta-cell function. Our results suggest that, rather than enhancing vitamin D substrate availability, upregulation of vitamin D action is more likely to lead to improvements in glucose homeostasis.
- Subjects
ASIA; VITAMIN D metabolism; ADIPOSE tissues; BIOMARKERS; ENERGY metabolism; HOMEOSTASIS; INSULIN resistance; METABOLITES; TYPE 2 diabetes; TRIGLYCERIDES; VITAMIN D
- Publication
Nutrients, 2020, Vol 12, Issue 12, p3706
- ISSN
2072-6643
- Publication type
Article
- DOI
10.3390/nu12123706