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1,25D3 prevents CD8+Tc2 skewing and asthma development through VDR binding changes to the Cyp11a1 promoter #MMPMID26750596
Schedel M; Jia Y; Michel S; Takeda K; Domenico J; Joetham A; Ning F; Strand M; Han J; Wang M; Lucas JJ; Vogelberg C; Kabesch M; O'Connor BP; Gelfand EW
Nat Commun 2016[]; 7 (ä): ä PMID26750596show ga
Effector CD8+ T cells convert from IFN-?+ (Tc1) to IL-13+ (Tc2) cells in the presence of IL-4. Underlying regulatory mechanisms are not fully defined. Here, we show that addition of 1,25D3, the active form of vitamin D3, during CD8+ T-cell differentiation prevents IL-4-induced conversion to IL-13-producers. Transfer of 1,25D3-treated CD8+ T cells into sensitized and challenged CD8+-deficient recipients fails to restore development of lung allergic responses. 1,25D3 alters vitamin D receptor (VDR) recruitment to the Cyp11a1 promoter in vitro and in vivo in the presence of IL-4. As a result, protein levels and enzymatic activity of CYP11A1, a steroidogenic enzyme regulating CD8+ T-cell conversion, are decreased. An epistatic effect between CYP11A1 and VDR polymorphisms may contribute to the predisposition to childhood asthma. These data identify a role for 1,25D3 in the molecular programming of CD8+ T-cell conversion to an IL-13-secreting phenotype through regulation of steroidogenesis, potentially governing asthma susceptibility.