Int J Med Sci 2017; 14(10):1002-1007. doi:10.7150/ijms.20809
IL-36γ inhibits differentiation and induces inflammation of keratinocyte via Wnt signaling pathway in psoriasis
Department of Dermatology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100730, China
Wang W, Yu X, Wu C, Jin H. IL-36γ inhibits differentiation and induces inflammation of keratinocyte via Wnt signaling pathway in psoriasis. Int J Med Sci 2017; 14(10):1002-1007. doi:10.7150/ijms.20809. Available from http://www.medsci.org/v14p1002.htm
Psoriasis is a common inflammatory skin disease characterized by abnormal keratinocyte inflammation and differentiation that has a major impact on patients' quality of life. IL-36γ, a member of IL-36 cytokine family, is highly expressed in psoriasis and plays an important role in inflammation response and differentiation. However, the function of IL-36γ in differentiation and inflammation of keratinocyte in psoriasis has not been clearly identified. Thus, this study aimed to investigate the role of IL-36γ on differentiation and inflammation in HaCaT cells. HaCaT cells were divided into three groups: (1) Control group; (2) IL-36γ (100 ng/mL) group; (3) IL-36γ (100 ng/mL) + IWP-2 (1μM) group. Real time PCR was used to detect gene expression; the inflammation cytokines were examined by ELISA. We showed that treatment of HaCaT cells with IL-36γ significantly upregulated the expression levels of β-catenin, cyclin D1, and ki-67. IL-36γ also promoted the production of the inflammatory cytokines IFN-γ, IL-1β and IL-6, suppressed the expression of filaggrin, involucrin, keratin 1 and keratin 5. Meanwhile, we demonstrated the role of IWP-2, an inhibitor of the Wnt signaling pathway, in IL-36γ-treated HaCaT cells. Collectively, our findings suggest that IL-36γ inhibits differentiation and induces inflammation of keratinocyte via Wnt signaling pathway in psoriasis, this indicated that downregulation of IL-36γ may be a potential therapeutic option in psoriasis.
Keywords: Psoriasis, IL-36γ, Wnt signaling pathway, differentiation, inflammation