Lack of retinoic acid leads to increased langerin-expressing dendritic cells in gut-associated lymphoid tissues

Gastroenterology
Sun-Young ChangMi-Na Kweon

Abstract

Retinoic acid (RA) is a crucial factor for maintaining homeostasis in the gut, including lymphocyte homing, immunoglobulin (Ig) A production, and T regulatory cells (Treg) and T helper cell 17 (T(H)17) generation. Until now, most attention has focused on the function of dendritic cells (DCs) to initiate adaptive immunity including T and B lymphocytes through RA. To investigate the effects of RA on DCs of gut-associated lymphoid tissue (GALT), we analyzed the phenotype and function of DC subsets from GALT of vitamin A-deficient (VAD) mice. VAD mice were prepared by feeding them a VAD diet over 12 weeks from gestational days 10-14. Here, we report that tremendous increase of langerin(+) DCs occurred in the mesenteric lymph nodes (MLNs) and gut lamina propria of VAD mice dependent on CCR7 signaling. Langerin(+) DCs have phenotypes more similar to those of bone marrow-derived dermal langerin(+) DCs than epidermal Langerhans cells. Moreover, RA receptor antagonists enhance the differentiation of langerin(+) DCs from mouse and human precursors of bone marrow and peripheral blood. Langerin(+) DCs were highly differentiated but less inflammatory than langerin(-) DCs of MLNs of VAD mice. Moreover, tolerance to orally delivered antigen w...Continue Reading

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