Tyk2 is a therapeutic target for psoriasis-like skin inflammation

International Immunology
Masayuki IshizakiTadashi Matsuda

Abstract

Tyrosine kinase 2 (Tyk2), a member of the Jak kinase family, mediates signals triggered by various cytokines, which are related to the pathogenesis of psoriasis. In this study, we investigated the role of Tyk2 in IL-23-induced psoriasis-like skin inflammation. Tyk2(-/-) mice when injected with IL-23 showed significantly reduced ear skin swelling with epidermal hyperplasia and inflammatory cell infiltration compared with wild-type mice. In addition, Tyk2 deficiency reduced production of pro-inflammatory cytokines and psoriasis-relevant anti-microbial peptides. More noteworthy is that Tyk2 directly regulated IL-22-dependent inflammation and epidermal hyperplasia. Taken together with the inhibition of IL-23-induced inflammation by treatment with neutralizing antibodies against IL-17 or IL-22, Tyk2 participates in both IL-23 and IL-22 signal transduction to mediate psoriasis-like skin inflammation. On the basis of these findings, we demonstrated for the first time that a small-molecule Tyk2 inhibitor significantly inhibited IL-23-induced inflammation and cytokine production in the skin. These observations demonstrate the important role of Tyk2 in experimental skin inflammation and indicate the therapeutic potential of Tyk2 inhibiti...Continue Reading

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