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The current state of play of rodent models to study the role of vitamin D in UV-induced immunomodulationUltraviolet radiation (UVR) from sunlight is immunomodulatory and the main source of vitamin D for humans.
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FcgammaRIIb Expression Is Decreased on Naive and Marginal Zone-Like B Cells From Females With Multiple SclerosisB cells are critical to the development of multiple sclerosis (MS), but the mechanisms by which they contribute to the disease are poorly defined. We hypothesised that the expression of CD32b (FcγRIIb), a receptor for the Fc region of IgG with inhibitory activities in B cells, is lower on B cell subsets from people with clinically isolated syndrome (CIS) or MS. CD32b expression was highest on post-naive IgM+ B cell subsets in healthy controls. For females with MS or CIS, significantly lower CD32b expression was identified on IgM+ B cell subsets, including naive and IgMhi MZ-like B cells, when compared with control females. Lower CD32b expression on these B cell subsets was associated with detectable anti-Epstein Barr Virus viral capsid antigen IgM antibodies, and higher serum levels of B cell activating factor. To investigate the effects of lower CD32b expression, B cells were polyclonally activated in the presence of IgG immune complexes, with or without a CD32b blocking antibody, and the expression of TNF and IL-10 in B cell subsets was assessed.
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In “high-risk” infants with sufficient vitamin d status at birth, infant vitamin D supplementation had no effect on allergy outcomes: A randomized controlled trialEarly infancy oral vitamin D supplementation does not appear to reduce the development of early childhood allergic disease
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IgG3 + B cells are associated with the development of multiple sclerosisWe have identified previously uncharacterised subsets of IgG3 + B cells and shown them to correlate with autoimmune attacks on the central nervous system
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Low-dose UV radiation before running wheel access activates brown adipose tissueWhen combined with physical activity, low-dose UVR may more effectively limit adiposity and modulate metabolic and immune pathways in iBAT
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Effects of UVR exposure on the gut microbiota of mice and humansBoth human and murine studies report that multiple exposures to sub-erythemal UV radiation can increase the diversity of the gut microbiome
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Vitamin D metabolites are lower with active Crohn’s disease and spontaneously recover with development of remissionWe aimed to characterise vitamin D metabolism in a cohort of patients with active and inactive Crohn’s disease
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Exposure to Ultraviolet Radiation in the Modulation of Human DiseasesThis review focuses primarily on the beneficial effects for human health of exposure to ultraviolet radiation
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High Dose Vitamin D supplementation alters faecal microbiome and predisposes mice to more severe colitisHigh dose vitamin D supplementation is associated with a shift to a more inflammatory faecal microbiome and increased susceptibility to colitis
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Reticulon-1 and reduced migration toward chemoattractants by macrophages differentiated from the bone marrow of ultraviolet-irradiated and ultraviolet-chimeric miceBy using an anti-reticulon-1 Ab, a role for reticulon-1 in macrophage migration toward both CSF-1 and CCL2 was confirmed.