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Vitamin D Deficiency Linked to Chronic Inflammation

We are always interested in research which can show what conditions may cause chronic inflammation

Australian Center for Precision Health, University of South Australia Cancer Research Institute,
Adelaide, Australia, 2
South Australian Health and Medical Research Institute, Adelaide, Australia and 3
Population, Policy and Practice, UCL Institute of Child Health, London, UK
*Corresponding author. Australian Center for Precision Health, University of South Australia Cancer Research Institute,
GPO Box 2471, Adelaide, SA 5001, Australia. E-mail: Elina.Hypponen@unisa.edu.au
Received 14 December 2021; Editorial decision 29 March 2022; Accepted 8 April 2022

 

Abstract
Background: Low vitamin D status is often associated with systemic low-grade inflam-
mation as reflected by elevated C-reactive protein (CRP) levels. We investigated the cau-
sality and direction of the association between vitamin D status and CRP using linear and non-linear Mendelian randomization (MR) analyses.

Methods: MR analyses were conducted using data from 294 970 unrelated participants
of White-British ancestry from the UK Biobank. Serum 25-hydroxyvitamin D [25(OH)D] and CRP concentrations were instrumented using 35 and 46 genome-wide significant variants, respectively.

Results: In non-linear MR analysis, genetically predicted serum 25(OH)D had an L-shaped
association with serum CRP, where CRP levels decreased sharply with increasing
25(OH)D concentration for participants within the deficiency range (<25 nmol/L) and lev-
elled off at – 50 nmol/L of 25(OH)D (Pnon-linear ¼ 1.49E-4).

Analyses using several pleiotropy-robust methods provided consistent results in stratified MR analyses, con-
firming the inverse association between 25(OH)D and CRP in the deficiency range
(P ¼ 1.10E-05) but not with higher concentrations. Neither linear or non-linear MR analysis supported a causal effect of serum CRP level on 25(OH)D concentration (Plinear ¼ 0.32 and Pnon-linear ¼ 0.76).
Conclusion: The observed association between 25(OH)D and CRP is likely to be caused by vitamin D deficiency.

Correction of low vitamin D status may reduce chronic inflammation.
Key words: Non-linear Mendelian randomization, vitamin D, serum 25-hydroxyvitamin D concentration, C-reactive
protein, chronic inflammation

 

The full study can be read below

Vitamin D deficiency and C-reactive protein: a bidirectional Mendelian randomization study
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