Vitamin D: Nutrient, Hormone, and Immunomodulator.
Level 5 - mechanism / opinion, no new human data
Narrative review synthesizing mechanistic and associative findings without a systematic search protocol
PubMed 30400332 · doi:10.3390/nu10111656
What was done
This narrative review synthesized experimental and clinical literature regarding the immunomodulating properties of vitamin D, its receptor (VDR) expression across immune cells, and its association with autoimmune and chronic inflammatory conditions such as asthma, diabetes, and rheumatoid arthritis.
What was found
The abstract reports no numerical data, effect sizes, or statistical metrics. It describes mechanistic pathways wherein immune cells (including B and T lymphocytes, monocytes, macrophages, and dendritic cells) express VDR and convert 25(OH)D₃ into active 1,25(OH)₂D₃, thereby promoting regulatory T-cell differentiation, suppressing Th17 responses, and reducing inflammatory cytokine secretion.
Why it matters
It maps the cellular and metabolic pathways by which vitamin D acts directly on immune cells, framing its potential relevance beyond classical bone metabolism.
Limits
The review relies on narrative synthesis and mechanistic reasoning rather than a systematic methodology or meta-analysis. No primary quantitative data, sample sizes, or clinical trial outcomes are reported in the abstract, limiting direct conclusions regarding clinical efficacy or causal therapeutic effects.
Cited by
- supports Vitamin D binding to immune cells shifts them away from a pro-inflammatory state.