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Nfkbiz is an inhibitor of nuclear factor κB (IκB) protein localized to the nucleus. We previously found that Nfkbiz gene-disrupted mice showed atopic dermatitis-like lesion, implying the important role of Nfkbiz in skin homeostasis. The purpose of this study was to examine the effect of interferon (IFN)-γ on Nfkbiz expression in keratinocytes. IFN-γ induced Nfkbiz expression at a comparable level to IL-1. Promoter analysis revealed that interferon-stimulated response element (ISRE) located in the Nfkbiz promoter region is important for responding to the stimulation. Interestingly, IFN-γ and IL-1 displayed synergism in terms of inducing Nfkbiz expression. By using selective inhibitors, we found that Janus activated kinase (JAK) 1 and nuclear factor (NF)-κB are important for Nfkbiz expression after IFN-γ stimulation and for synergism between IFN-γ and IL-1. These findings indicate a possible important role of Nfkbiz in modulating the progression of inflammatory diseases in which IFN-γ and IL-1 are abundant.

<b>The role of IFN-γ in regulating Nfkbiz expression in epidermal </b><b>keratinocytes </b>