Vitamin D Impacts on Multiple Sclerosis Dynamics

Multiple sclerosis (MS) is a chronic inflammatory and neurodegenerative disorder in which genetic predisposition and environmental factors converge to drive immune-mediated damage to myelin and axons. Epidemiological studies have long linked low serum levels of 25-hydroxyvitamin D with increased MS incidence and geographic gradients in disease prevalence. Mechanistic investigations reveal that the active form of vitamin D, 1,25-dihydroxyvitamin D₃, exerts pleiotropic effects on both innate and adaptive immunity, including enhancement of regulatory T cell function, suppression of pro-inflammatory Th1 and Th17 responses, and modulation of antigen-presenting cell activity. Beyond immunoregulation, emerging evidence supports a direct neuroprotective role for vitamin D in promoting oligodendrocyte precursor proliferation, accelerating remyelination, alleviating oxidative stress and maintaining blood–brain barrier integrity. Genetic analyses, such as Mendelian randomisation, suggest a potential causal relationship between lifelong vitamin D insufficiency and MS susceptibility. Clinical intervention trials of cholecalciferol supplementation have yielded mixed results; high-dose regimens appear safe and induce favourable shifts in cytokine profiles, but definitive effects on relapse rate, lesion burden and disability progression remain unconfirmed. Optimal dosing, timing relative to disease stage and interactions with standard immunotherapies continue to be refined. Overall, vitamin D occupies a unique position at the interface of environmental risk and therapeutic opportunity in MS, with global relevance for prevention strategies and adjunctive treatment design.

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Vitamin D Impacts on Multiple Sclerosis Dynamics publication trend

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Technical terms

25-hydroxyvitamin D (25(OH)D): The primary circulating form of vitamin D used clinically to assess nutritional status.

Clinically isolated syndrome: A first neurological episode lasting at least 24 hours indicative of demyelination but not yet fulfilling diagnostic criteria for MS.

Oligodendrocyte: A central nervous system glial cell responsible for formation and maintenance of the myelin sheath around axons.

Regulatory T cell (Treg): A subset of CD4⁺ T lymphocytes that suppress excessive immune activation and maintain self-tolerance.

Vitamin D receptor (VDR): A nuclear transcription factor that mediates the genomic effects of 1,25-dihydroxyvitamin D₃ by regulating target gene expression.

References

1. Vitamin D did not reduce multiple sclerosis disease activity after a clinically isolated syndrome. Brain (2023).
2. Vitamin D and Risk of Multiple Sclerosis: A Mendelian Randomization Study. PLOS Medicine (2015).
3. The Role of Vitamin D in Neuroprotection in Multiple Sclerosis: An Update. Nutrients (2023).
4. Safety and T Cell Modulating Effects of High Dose Vitamin D3 Supplementation in Multiple Sclerosis. PLOS ONE (2010).