Abstract
Background/Objectives:
The aim was to examine the causal effect of vitamin D on serum adiponectin using a multiple instrument Mendelian randomization approach.
Subjects/Methods:
Serum 25-hydroxy vitamin D (25(OH)D) and serum total or high molecular weight (HMW) adiponectin were measured in two Danish population-based studies: the Inter99 study (6405 adults, 30–60 years) conducted in 1999–2001, and the MONICA10 study (2656 adults, 41–71 years) conducted in 1993–1994.
Results:
In the Inter99 study, serum 25(OH)D was positively associated with total adiponectin (the effect estimate in % per doubling of 25(OH)D was 4.78, 95% CI: 1.96, 7.68, P<0.001). Using variations in the vitamin D-binding protein gene and the filaggrin gene as instrumental variables, the causal effect in % was estimated to 61.46, 95% CI: 17.51, 120.28, P=0.003 higher adiponectin per doubling of 25(OH)D. In the MONICA10 cohort, no significant association was observed between the serum concentrations of 25(OH)D and HMW adiponectin (the effect estimate in % per doubling of 25(OH)D was −1.51, 95% CI: −5.80, 2.98, P=0.50), although the instrumental variables analysis to some extent supported a positive causal association (the effect estimate in % per doubling of 25(OH)D was 37.13, 95% CI: −3.67, 95.20, P=0.080).
Conclusions:
The results indicate a possible causal association between serum 25(OH)D and total adiponectin. However, the association was not replicated for HMW adiponectin. Thus, further studies are needed to confirm a causal relationship.
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Acknowledgements
This work was supported by grants from the Health Insurance Foundation (grant No. 2010 B 131), the Danish Agency for Science Technology and Innovation (grant No. 2101-06-0065) and the Region H Research Foundation. The authors wish to thank the Inter99 Steering Committee (Dr Torben Jørgensen (principal investigator), Dr Knut Borch-Johnsen (co-principal investigator) and Dr Charlotta Pisinger and all the members of the Inter99 staff at the Research Centre for Prevention and Health and Steno Diabetes Center.
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Husemoen, L., Skaaby, T., Martinussen, T. et al. Investigating the causal effect of vitamin D on serum adiponectin using a mendelian randomization approach. Eur J Clin Nutr 68, 189–195 (2014). https://doi.org/10.1038/ejcn.2013.233
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DOI: https://doi.org/10.1038/ejcn.2013.233
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