title: Up-regulation of Interferon-inducible protein 16 contributes to psoriasis by modulating chemokine production in keratinocytes.
abstract: Psoriasis is a common chronic inflammatory skin disease characterized by epidermal hyperplasia and dermal inflammation. Keratinocyte activation is known to play a critical role in psoriasis, but the underlying mechanism remains unclear. Interferon-inducible protein 16 (IFI16), an innate immune system sensor, is reported to affect keratinocyte function. We therefore hypothesized that IFI16 promotes psoriasis by modulating keratinocyte activation. In the present study, we cinfirmed that IFI16 was overexpressed in epidermal keratinocytes of psoriasis patients. In addition, psoriasis-related cytokines, including IFN-γ, TNF-α, IL-17 and IL-22, induced IFI16 up-regulation in keratinocytes via activation of STAT3 signaling. We also observed that IFI16 activated the TBK1-NF-κB signaling, leading to the production of CXCL10 and CCL20. Importantly, knocking down p204, which is reported as the mouse orthologous of human IFI16, inhibited epidermal hyperplasia in mice with imiquimod-induced psoriasiform dermatitis. These findings indicate that IFI16 plays a critical role in the pathogenesis of psoriasis and may be a potential therapeutic target.
authors.affiliation: Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi'an, China.
authors.forename: Tianyu
authors.initials: T
authors.lastname: Cao
authors.affiliation: Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi'an, China.
authors.forename: Shuai
authors.initials: S
authors.lastname: Shao
authors.affiliation: Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi'an, China.
authors.forename: Bing
authors.initials: B
authors.lastname: Li
authors.affiliation: Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi'an, China.
authors.forename: Liang
authors.initials: L
authors.lastname: Jin
authors.affiliation: Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi'an, China.
authors.forename: Jie
authors.initials: J
authors.lastname: Lei
authors.affiliation: Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi'an, China.
authors.forename: Hongjiang
authors.initials: H
authors.lastname: Qiao
authors.affiliation: Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi'an, China.
authors.forename: Gang
authors.initials: G
authors.lastname: Wang
mesh_terms: D000818:Animals; D018925:Chemokines / Q000235:genetics*; D005786:Gene Expression Regulation / Q000235:genetics; D006801:Humans; D007371:Interferon-gamma / Q000235:genetics; D020381:Interleukin-17 / Q000235:genetics; D007378:Interleukins / Q000235:genetics; D015603:Keratinocytes / Q000378:metabolism* / Q000473:pathology; D051379:Mice; D009687:Nuclear Proteins / Q000235:genetics*; D010750:Phosphoproteins / Q000235:genetics*; D011565:Psoriasis / Q000235:genetics* / Q000473:pathology; D050796:STAT3 Transcription Factor / Q000235:genetics; D015398:Signal Transduction; D014409:Tumor Necrosis Factor-alpha / Q000235:genetics; D000097043:Interleukin-22
chemical_list: D018925:Chemokines; D007371:Interferon-gamma; D020381:Interleukin-17; D007378:Interleukins; D009687:Nuclear Proteins; D010750:Phosphoproteins; D050796:STAT3 Transcription Factor; D014409:Tumor Necrosis Factor-alpha; D000097043:Interleukin-22; C076700:IFI16 protein, human