Circulating vitamin D binding protein levels are not associated with relapses or with vitamin D status in multiple sclerosis

Abstract

Background:

A low vitamin D status has been associated with multiple sclerosis (MS). Most circulating vitamin D metabolites are bound to vitamin D binding protein (DBP).

Objectives:

The purpose of this study was to explore whether there is an association between MS and DBP.

Methods:

We compared DBP concentrations in blood samples of controls (n = 30) and subjects with relapsing–remitting MS (RRMS) during remission (n = 29) and relapse (n = 15). Furthermore, we explored correlations of DBP with 25- hydroxyvitamin D (25(OH)D) and 1,25-dihydroxyvitamin D levels (1,25(OH)₂D), and the effect of high-dose vitamin D₃ supplementation on DBP levels in RRMS patients (n = 15).

Results:

DBP-concentration did not differ between the sub-groups measured, and there was no correlation between DBP and vitamin D metabolite concentration within the physiological range. Upon supplementation of high doses vitamin D₃, DBP concentration remained unaltered. After supplementation, serum 1,25(OH)₂D(R = 0.517, p = 0.049), but not 25(OH)D, correlated positively with DBP.

Conclusions:

We found no association between DBP, MS, and vitamin D status within the physiological range. After high - dose vitamin D supplementation, DBP concentrations may be relevant for vitamin D metabolism.

Keywords

Multiple sclerosis vitamin D vitamin D binding protein

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