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Journal of Immunology Research
Volume 2016, Article ID 1426503, 13 pages
http://dx.doi.org/10.1155/2016/1426503
Research Article

Dietary Vitamin D Increases Percentages and Function of Regulatory T Cells in the Skin-Draining Lymph Nodes and Suppresses Dermal Inflammation

Telethon Kids Institute, University of Western Australia, Perth, WA, Australia

Received 12 June 2016; Revised 4 August 2016; Accepted 17 August 2016

Academic Editor: Manoj K. Mishra

Copyright © 2016 Shelley Gorman et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Skin inflammatory responses in individuals with allergic dermatitis may be suppressed by dietary vitamin D through induction and upregulation of the suppressive activity of regulatory T () cells. Vitamin D may also promote cell tropism to dermal sites. In the current study, we examined the capacity of dietary vitamin D3 to modulate skin inflammation and the numbers and activity of cells in skin and other sites including lungs, spleen, and blood. In female BALB/c mice, dietary vitamin D3 suppressed the effector phase of a biphasic ear swelling response induced by dinitrofluorobenzene in comparison vitamin D3-deficient female BALB/c mice. Vitamin D3 increased the percentage of (CD3+CD4+CD25+Foxp3+) cells in the skin-draining lymph nodes (SDLN). The suppressive activity of cells in the SDLN, mesenteric lymph nodes, spleen, and blood was upregulated by vitamin D3. However, there was no difference in the expression of the naturally occurring cell marker, neuropilin, nor the expression of CCR4 or CCR10 (skin-tropic chemokine receptors) on cells in skin, SDLN, lungs, and airway-draining lymph nodes. These data suggest that dietary vitamin D3 increased the percentages and suppressive activity of cells in the SDLN, which are poised to suppress dermal inflammation.