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)2D3, 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)2D3 suppressed the gut-homing receptors α4β7 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.
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Acknowledgements
We acknowledge the University of California Santa Cruz Genome Browser created by the Genome Bioinformatics Group of the University of California Santa Cruz, and thank C. Crumpton-Carswell and L. Rott for flow cytometry assistance; F. Lin for help with graphics; L. Gigliello and J. Hay (University of Toronto) for help with surgical procedures; and A. Chawla for RXR-β protein. Mouse anti–ovine CD11c was provided by A. Young (South Dakota State University). Supported by the National Institutes of Health (E.C.B.; 5 T32 AI07290-21 to H.S.), the Department of Veterans Affairs (E.C.B.), the FACS Core Facility of the Stanford Digestive Disease Center, the Arthritis Foundation (G.F.D.) and the Deutsche Forschungsgemeinschaft (C.A.).
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H.S., J.P. and E.C.B. designed and conceptualized the research; H.S. did the in vitro human experiments; J.P. did the microarray, PCR and gel-shift studies and vitamin D measurements; G.F.D. and C.A. did the sheep experiments; D.S. provided essential CCR9 and CCR10 antibodies; A.H. provided intellectual and experimental input; and H.S. and E.C.B. wrote the paper with assistance from J.P. and input from G.F.D.
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D.S. is an employee of Millennium Pharmaceuticals.
Supplementary information
Supplementary Fig. 1
1,25(OH)2D3 but not retinoic acid induces the expression of CCR10 on CD8+ T cells. (PDF 661 kb)
Supplementary Fig. 2
Genomic view of the CCR10 gene. (PDF 84 kb)
Supplementary Fig. 3
Chemokine receptor expression by circulating memory and in vitro activated T cell subsets. (PDF 589 kb)
Supplementary Fig. 4
Schematic summary of the proposed role of sunlight, vitamin D and dendritic cells in the induction of CCR10 on T cells. (PDF 418 kb)
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Sigmundsdottir, H., Pan, J., Debes, G. et al. DCs metabolize sunlight-induced vitamin D3 to 'program' T cell attraction to the epidermal chemokine CCL27. Nat Immunol 8, 285–293 (2007). https://doi.org/10.1038/ni1433
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DOI: https://doi.org/10.1038/ni1433
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