Vitamin A is not associated with exacerbations in multiple sclerosis

Area of Science:

• Neuroimmunology
• Nutritional Neuroscience

Background:

• Vitamin A plays a role in immune regulation, potentially influencing T-cell differentiation relevant to multiple sclerosis (MS).
• Vitamin A's proposed role in inhibiting Th17 cells and promoting Treg cells suggests it might reduce MS relapse risk.

Purpose of the Study:

• To compare serum vitamin A (all-trans-retinol) levels between patients with relapsing-remitting MS (RRMS) and healthy controls.
• To determine if vitamin A levels are associated with relapse rates in RRMS patients.

Main Methods:

• A case-control study compared all-trans-retinol levels in 31 RRMS patients and 29 controls.
• A prospective longitudinal study monitored serum all-trans-retinol every eight weeks in 73 RRMS patients over a mean of 1.7 years.
• Poisson regression analyzed the association between time-dependent all-trans-retinol levels and relapse rates.

Main Results:

• Mean vitamin A levels were borderline significantly lower in RRMS patients (2.16 μmol/l) compared to controls (2.44 μmol/l; p=0.05).
• No significant association was found between serum all-trans-retinol levels (categorized into tertiles) and relapse rates in RRMS patients (p>0.2).
• A weak positive correlation was observed between serum all-trans-retinol and 25-OH-vitamin D levels (r=0.15).

Conclusions:

• The study found no evidence supporting a role for vitamin A in the disease progression of RRMS.
• An association between vitamin A and vitamin D levels was noted in RRMS patients, potentially linked to dietary intake of fat-soluble vitamins.