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Sun-Young Chang, Hye-Ran Cha, Osamu Igarashi, Paul D Rennert, Adrien Kissenpfennig, Bernard Malissen, Masanobu Nanno, Hiroshi Kiyono, Mi-Na Kweon, Cutting Edge: Langerin+ Dendritic Cells in the Mesenteric Lymph Node Set the Stage for Skin and Gut Immune System Cross-Talk, The Journal of Immunology, Volume 180, Issue 7, April 2008, Pages 4361–4365, https://doi.org/10.4049/jimmunol.180.7.4361
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Abstract
Topical transcutaneous immunization (TCI) presents many clinical advantages, but its underlying mechanism remains unknown. TCI induced Ag-specific IgA Ab-secreting cells expressing CCR9 and CCR10 in the small intestine in a retinoic acid-dependent manner. These intestinal IgA Abs were maintained in Peyer’s patch-null mice but abolished in the Peyer’s patch- and lymph node-null mice. The mesenteric lymph node (MLN) was shown to be the site of IgA isotype class switching after TCI. Unexpectedly, langerin+CD8α− dendritic cells emerged in the MLN after TCI; they did not migrate from the skin but rather differentiated rapidly from bone marrow precursors. Depletion of langerin+ cells impaired intestinal IgA Ab responses after TCI. Taken together, these findings suggest that MLN is indispensable for the induction of intestinal IgA Abs following skin immunization and that cross-talk between the skin and gut immune systems might be mediated by langerin+ dendritic cells in the MLN.