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* Swiss Institute for Experimental Cancer Research and
Institute of Biochemistry, University of Lausanne, Epalinges, Switzerland;
Ludwig Institute for Cancer Research, Epalinges, Switzerland;
Institut National de la Santé et de la Recherche Médicale, Unité 404, Lyon, France;
¶ Institute for Nutrition Research, University of Oslo, Oslo, Norway; and
|| Department of Host Defense, Osaka University, Osaka, Japan
Activation of dendritic cells (DC) by microbial products via Toll-like receptors (TLR) is instrumental in the induction of immunity. In particular, TLR signaling plays a major role in the instruction of Th1 responses. The development of Th2 responses has been proposed to be independent of the adapter molecule myeloid differentiation factor 88 (MyD88) involved in signal transduction by TLRs. In this study we show that flagellin, the bacterial stimulus for TLR5, drives MyD88-dependent Th2-type immunity in mice. Flagellin promotes the secretion of IL-4 and IL-13 by Ag-specific CD4+ T cells as well as IgG1 responses. The Th2-biased responses are associated with the maturation of DCs, which are shown to express TLR5. Flagellin-mediated DC activation requires MyD88 and induces NF-
B-dependent transcription and the production of low levels of proinflammatory cytokines. In addition, the flagellin-specific response is characterized by the lack of secretion of the Th1-promoting cytokine IL-12 p70. In conclusion, this study suggests that flagellin and, more generally, TLR ligands can control Th2 responses in a MyD88-dependent manner.
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