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  • Title: Human immature myeloid dendritic cells trigger a TH2-polarizing program via Jagged-1/Notch interaction.
    Author: Liotta F, Frosali F, Querci V, Mantei A, Filì L, Maggi L, Mazzinghi B, Angeli R, Ronconi E, Santarlasci V, Biagioli T, Lasagni L, Ballerini C, Parronchi P, Scheffold A, Cosmi L, Maggi E, Romagnani S, Annunziato F.
    Journal: J Allergy Clin Immunol; 2008 Apr; 121(4):1000-5.e8. PubMed ID: 18313135.
    Abstract:
    BACKGROUND: The mechanisms by which human dendritic cells (DCs) activate a TH1-polarizing or TH2-polarizing program are still partially unclear. OBJECTIVE: Study of the mechanisms responsible for the TH1/TH2-polarizing activity of human circulating myeloid DCs before and after ligation of their Toll-like receptors (TLRs). METHODS: IL-4 and IFN-gamma production by CD4+ T cells was assessed in cocultures with myeloid DCs before or after TLR triggering. Expression of Jagged-1 and Delta-4 Notch ligands and of GATA-3 and T-box expressed in T cells transcription factors was evaluated by real-time quantitative PCR. Signal transducer and activator of transcription 4 and 6 phosphorylation was assessed by flow cytometry. Knockdown of Jagged-1 or Delta-4 was performed by transfection of DCs with appropriate silencing mRNAs. RESULTS: Myeloid immature DCs constitutively expressed Jagged-1, which induces in CD4+ T cells a TH2 polarization, as shown by Jagged-1 gene silencing. The TH2 polarization associated with high GATA-3/T-box expressed in T cells ratio and was at least partially dependent on the early induction of IL-4. Maturation of DCs by TLR ligation resulted in the reduction of Jagged-1 and upregulation of Delta-4, which was at least in part responsible for the polarization of CD4+ T cells to the TH1 phenotype. CONCLUSION: CD4+ T-cell responses are usually characterized by a prevalent TH2 phenotype unless TLRs are triggered on DCs by microbial components.
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