DCs metabolize sunlight-induced vitamin D3 to 'program' T cell attraction to the epidermal chemokine CCL27 - PubMed (original) (raw)
doi: 10.1038/ni1433. Epub 2007 Jan 28.
Affiliations
- PMID: 17259988
- DOI: 10.1038/ni1433
DCs metabolize sunlight-induced vitamin D3 to 'program' T cell attraction to the epidermal chemokine CCL27
Hekla Sigmundsdottir et al. Nat Immunol. 2007 Mar.
Abstract
During adaptive immune responses, dendritic cells activate T cells and endow them with specific homing properties. Mechanisms that 'imprint' specific tropisms, however, are not well defined. We show here that 1,25(OH)(2)D(3), the active form of vitamin D3, signaled T cells to express CC chemokine receptor 10, which enabled them to migrate to the skin-specific chemokine CCL27 secreted by keratinocytes of the epidermis. In contrast, 1,25(OH)(2)D(3) suppressed the gut-homing receptors alpha4beta7 and CCR9. Vitamin D3, the inactive prohormone naturally generated in the skin by exposure to the sun, was processed by dendritic cells and T cells to the active metabolite, providing a mechanism for the local regulation of T cell 'epidermotropism'. Our findings support a model in which dendritic cells process and 'interpret' locally produced metabolites to 'program' T cell homing and microenvironmental positioning.
Comment in
- Vitamins in control of lymphocyte migration.
Mebius RE. Mebius RE. Nat Immunol. 2007 Mar;8(3):229-30. doi: 10.1038/ni0307-229. Nat Immunol. 2007. PMID: 17304229 No abstract available.
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