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- W1891008369 abstract "The severity of allergic diseases may be modified by vitamin D. However, the immune pathways modulated by the active form of vitamin D, 1,25-dihydroxyvitamin D(3) [1,25(OH)(2)D(3)], are yet to be fully elucidated. In this study, naturally occurring CD4(+) CD25(+) cells from the skin-draining lymph nodes (SDLN) of mice treated with topical 1,25(OH)(2)D(3) had an increased ability to suppress T helper type 2 (Th2) -skewed immune responses. CD4(+) CD25(+) cells transferred from mice treated with topical 1,25(OH)(2)D(3) into ovalbumin (OVA) -sensitized mice challenged intranasally with OVA 18 hr later, significantly suppressed the capacity of airway-draining lymph node (ADLN) cells to proliferate and secrete cytokines in response to further OVA stimulation ex vivo. The CD4(+) CD25(+) cells from 1,25(OH)(2)D(3)-treated mice also reduced airway hyperresponsiveness and the proportions of neutrophils and eosinophils in bronchoalveolar lavage fluid (BALF). To test the effect of 1,25(OH)(2)D(3) on cells able to respond to a specific antigen, CD4(+) CD25(+) cells were purified from the SDLN of OVA-T-cell receptor (TCR) transgenic mice treated 4 days earlier with topical 1,25(OH)(2)D(3). CD4(+) CD25(+) cells from OVA-TCR mice treated with 1,25(OH)(2)D(3) were able to alter BALF cell content and suppress ADLN responses to a similar degree to those cells from non-transgenic mice, suggesting that the effect of 1,25(OH)(2)D(3) was not related to TCR signalling. In summary, topical 1,25(OH)(2)D(3) increased the regulatory capacity of CD4(+) CD25(+) cells from the SDLN to suppress Th2-mediated allergic airway disease. This work highlights how local 1,25(OH)(2)D(3) production by lung epithelial cells may modulate the suppressive activity of local regulatory T cells." @default.
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- W1891008369 date "2010-01-06" @default.
- W1891008369 modified "2023-09-30" @default.
- W1891008369 title "1,25-dihydroxyvitamin D3 enhances the ability of transferred CD4+ CD25+ cells to modulate T helper type 2-driven asthmatic responses" @default.
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- W1891008369 doi "https://doi.org/10.1111/j.1365-2567.2009.03222.x" @default.
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