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* Department of Applied Biological Chemistry, University of Tokyo, Tokyo, Japan;
Department of Epidemiology and Public Health, Yale University School of Medicine, New Haven, CT 06520; and
Department of Food Science and Technology, College of Bioresource Sciences, Nihon University, Kanagawa, Japan
Peyer’s patch (PP) dendritic cells (DCs) have been shown to exhibit a distinct capacity to induce cytokine secretion from CD4+ T cells compared with DCs in other lymphoid organs such as the spleen (SP). In this study, we investigated whether PP DCs are functionally different from DCs in the SP in their ability to induce Ab production from B cells. Compared with SP DCs, freshly isolated PP DCs induced higher levels of IgA secretion from naive B cells in DC-T cell-B cell coculture system in vitro. The IgA production induced by PP DCs was attenuated by neutralization of IL-6. In addition, the induction of IgA secretion by SP DCs, but not PP DCs, was further enhanced by the addition of exogenous IL-6. Finally, we demonstrated that only PP CD11b+ DC subset secreted higher levels of IL-6 compared with other DC subsets in the PP and all SP DC populations, and that PP CD11b+ DC induced naive B cells to produce higher levels of IgA compared with SP CD11b+ DC. These results suggest a unique role of PP CD11b+ DCs in enhancing IgA production from B cells via secretion of IL-6.
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