Un lien étroit entre la vitamine D et la sclérose en plaques

Chez les patients atteints de sclérose en plaques, le niveau de vitamine D est inversement proportionnel au niveau d’handicape. Plus il est faible plus le niveau d’handicape est élevé.

VOICI L'ARTICLE ORIGINAL (EN ANGLAIS SEULEMENT) : 
Abstract
BACKGROUND AND PURPOSE:
Vitamin D deficiency is a recognized risk factor for multiple sclerosis (MS) and is associated with increased disease activity. It has also been proposed that the lower the vitamin D levels are, the higher is the handicap.
METHODS:
To refine the links between vitamin D insufficiency and disability in MS patients, a retrospective cohort analysis was performed including 181 patients prospectively followed without previous vitamin D supplementation, and age, gender, age at MS onset, MS type, MS activity, Expanded Disability Status Scale (EDSS) were analysed in correlation with plasma vitamin D levels.
RESULTS:
Vitamin D levels were significantly higher in relapsing-remitting MS than in progressive forms of MS in multivariate analyses adjusted for age, ethnicity, gender, disease duration and season (P = 0.0487). Overall, there was a negative correlation between vitamin D level and EDSS score (P = 0.0001, r = -0.33). In relapsing-remitting MS, vitamin D levels were only correlated with disability scores for EDSS < 4 (P = 0.0012). Patients with >20 ng/ml of vitamin D were 2.78 times more likely to have an EDSS < 4 (P = 0.0011, 95% confidence interval 1.49-5.00).
CONCLUSION:
Data support previous work suggesting that vitamin D deficiency is associated with higher risk of disability in MS. Vitamin D levels also correlated with the degree of disability in fully ambulatory patients with relapsing-remitting MS. These additional results support the pertinence of randomized controlled trials analysing the interest of an early vitamin D supplementation in MS patients to influence evolution of disability.

http://www.ncbi.nlm.nih.gov/pubmed/25530281
Eur J Neurol. 2015 Mar;22(3):564-9. doi: 10.1111/ene.12617. Epub 2014 Dec 20.
Vitamin D is associated with degree of disability in patients with fully ambulatory relapsing-remitting multiple sclerosis.
Thouvenot E1, Orsini M, Daures JP, Camu W.
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