An important role of Tyk2 in APC function of dendritic cells for priming CD8+ T cells producing IFN-γ

Keiji Aizu, Wei Li, Toshiki Yajima, Toshiyuki Arai, Kazuya Shimoda, Yuji Nimura, Yasunobu Yoshikai

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    24 Citations (Scopus)


    Tyrosine kinase 2 (Tyk2) contributes to the signals triggered by IL-12 for IFN-γ production by NK cells and T cells. We found in this study that Tyk2-deficient (-/-) mice showed increased susceptibility at the early stage after an i.p. infection with Listeria monocytogenes, accompanied by impaired IFN-γ production. The numbers of both MHC class Ib (H2-M3)- or MHC class Ia (Kb)-restricted CD8+ T cells producing IFN-γ and exhibiting cytotoxicity were significantly decreased in Tyk2-/- mice after infection with L. monocytogenes. Using an adoptive transfer system of OT-I cells expressing OVA257-264/Kb-specific TCR into Tyk2-/- mice followed by challenge with recombinant L. monocytogenes expressing OVA, we found that the defective Tyk2 signaling in the host environment was at least partially responsible for the impaired CD8+ Tcytotoxic-1 (Tc1) cell responses in Tyk2-/- mice following the infection. Adoptive transfer with MHC class Ib- or MHC class Ia-binding peptide-pulsed BM-derived DC from Tyk2-/- mice induced lower levels of the Ag-specific CD8+ Tc1 cells producing IFN-γ. These results suggest that Tyk2 signaling is also important for DC function in the induction of MHC class Ia- and class Ib-restricted CD8+ Tc1 cells following L. monocytogenes infection.

    Original languageEnglish
    Pages (from-to)3060-3070
    Number of pages11
    JournalEuropean Journal of Immunology
    Issue number11
    Publication statusPublished - Nov 2006

    All Science Journal Classification (ASJC) codes

    • Immunology and Allergy
    • Immunology


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