Cell Action Mechanism References
Macrophages
/monocyte
Promotes differentiation
Inhibit dendritic cell differentiation
Reduced inflammatory Cytokines
Reduces co-stimulatory molecules
↑1α hydroxylase
↑1α hydroxylase
↓ IL-6,8,12, TNF*
↓ CD40, CD80, CD86 and HLA-DR*
[13,14,
18-20]
T cells Homing to inflamed tissue
Homing to skin
Increased T regulatory cells
Reduced inflammatory cytokines
↑CCR5, CXCR3, CXCR6*
↑CCR10
↑IL-10, TLR-9*
↓ IL-17, IL-2, IFN-gamma
[13,14,16,18,
20]  
Dendritic cells Increased T cell regulation
Reduced immune response
Reduced co-stimulatory molecules
Reduced cytokine release
↑IL-10, TGFß
↓ IL-17
↓ CD1a, CD14, CD40, CD86
↓ IL-12, IL-23
[12,13,14,18,
20]
Mast cells Stabilise mast cell
Reduces IgE dependant pro-inflammatory mediators
↓ histamine release
↑IL-10
[18,21,23]
*CCR and CXC-chemokine receptors IL-interleukin TLR-toll-like receptors, TGFß-transforming growth factor-beta, TNF-tissue necrosis factor. HLA: Human Leukocyte Antigens. IFN--gamma-interferon-gamma. CD-cluster designation of immune system cells
Table 2: Effects of 1,25 hydroxy-vitamin D on immune cells that may effect physical Urticaria [22,23].
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