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Vitamin D and C-Reactive Protein: A Mendelian Randomization Study
Marte C Liefaard1, Symen Ligthart2, Anna Vitezova2
1Department of Epidemiology, Erasmus University Medical Center, Rotterdam, the Netherlands; Netherlands Institute for Health Sciences, Rotterdam, the Netherlands.
Plos One
|July 7, 2015
Summary
Higher vitamin D levels correlate with lower C-reactive protein, indicating reduced systemic inflammation. However, this study found no causal link between vitamin D and inflammation markers.
Area of Science:
- Nutritional Immunology
- Biochemistry
Background:
- Vitamin D deficiency is common and linked to various diseases.
- Vitamin D is hypothesized to modulate immune responses and reduce inflammation.
Purpose of the Study:
- To investigate the inhibitory effect of vitamin D on systemic inflammation.
- To assess the association between serum vitamin D and C-reactive protein (CRP) levels.
Main Methods:
- Linear regression analysis of serum 25-hydroxyvitamin D and CRP in 9,649 participants from the Rotterdam Study.
- Bi-directional Mendelian randomization using genetic risk scores for vitamin D and CRP.
Main Results:
- A statistically significant inverse association was observed: higher 25-hydroxyvitamin D levels were linked to lower CRP levels (lnCRP decreased by 0.06 units per SD increase in 25(OH)D).
- Mendelian randomization analyses did not support a causal relationship in either direction.
Conclusions:
- Elevated vitamin D levels are associated with reduced systemic inflammation markers (CRP).
- The observed association is likely not causal, suggesting other factors may influence this relationship.
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