Keratinocyte Expression of A20/TNFAIP3 Controls Skin Inflammation Associated with Atopic Dermatitis and Psoriasis  Michael Devos, Denis A. Mogilenko,

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Keratinocyte Expression of A20/TNFAIP3 Controls Skin Inflammation Associated with Atopic Dermatitis and Psoriasis  Michael Devos, Denis A. Mogilenko, Sébastien Fleury, Barbara Gilbert, Coralie Becquart, Sandrine Quemener, Hélène Dehondt, Peter Tougaard, Bart Staels, Claus Bachert, Peter Vandenabeele, Geert Van Loo, Delphine Staumont-Salle, Wim Declercq, David Dombrowicz  Journal of Investigative Dermatology  Volume 139, Issue 1, Pages 135-145 (January 2019) DOI: 10.1016/j.jid.2018.06.191 Copyright © 2018 The Authors Terms and Conditions

Figure 1 A20/TNFAIP3 is down-regulated in epidermis of psoriasis and atopic dermatitis patients. (a) Significantly deregulated transcripts (Benjamini-Hochberg adjusted P-values < 0.05) in human epidermis isolated by laser capture microdissection from healthy skin (n = 5) or affected skin from patients with psoriasis (n = 6) or atopic dermatitis (n = 5). Some common up- and down-regulated genes are shown. (b) Gene set enrichment analysis of common genes significantly dysregulated in psoriasis and atopic dermatitis samples shown in a. (c) TNFAIP3 is decreased in human epidermis but not in dermis in psoriasis and atopic dermatitis. Relative expression of TNFAIP3 from healthy skin (n = 5) or involved and uninvolved skin from patients with psoriasis (n = 9) or atopic dermatitis (n = 5). ∗P < 0.05, ∗∗P < 0.01, ∗∗∗P < 0.001 by paired and unpaired Mann-Whitney U test. Graphs present mean ± standard error of the mean. AD, atopic dermatitis; FC, fold change; GO, gene ontology; Pso, psoriasis. Journal of Investigative Dermatology 2019 139, 135-145DOI: (10.1016/j.jid.2018.06.191) Copyright © 2018 The Authors Terms and Conditions

Figure 2 A20/TNFAIP3 deficiency in keratinocytes exacerbates IMQ-induced experimental psoriasis. (a) Abdominal skin morphology and histology. May-Grünwald Giemsa staining, scale bar = 50 μm. (b) Disease severity score. (c) Average epidermal thickness. (d) Infiltration of neutrophils (brown) in dermis and epidermis detected by Ly6G immunostaining. (e) Quantitative real-time reverse transcriptase–PCR analysis of inflammatory genes in whole skin. (f) Flow cytometry of classical dendritic cells (cDC), Langerhans cell (LCs), and macrophages in inguinal lymph nodes and (g) flow cytometry of γδT cells, γδT17, CD4 T cells and Th17 in inguinal lymph nodes (iLNs), during/after 6 days in the IMQ-induced model of psoriasis on A20 FL/FL and A20EKO mice. n = 5–6 mice per group. ∗P < 0.05, ∗∗P < 0.01, ∗∗∗P < 0.001 by two-way analysis of variance with Sidak post hoc test or two-sided t test. Graphs present mean ± standard error of the mean. IMQ, imiquimod. Journal of Investigative Dermatology 2019 139, 135-145DOI: (10.1016/j.jid.2018.06.191) Copyright © 2018 The Authors Terms and Conditions

Figure 3 A20/TNFAIP3 deficiency in keratinocytes exacerbates OVA-induced experimental atopic dermatitis. (a) Abdominal skin morphology and histology (May-Grünwald Giemsa staining, scale bar = 20 μm); (b) average epidermal thickness; (c) quantification of eosinophils in dermis; (d) total and OVA-specific IgE, IgG1, IgG2a, and IgG2c in serum; and (e) flow cytometry of T cells in inguinal lymph nodes after the epicutaneous OVA sensitization model of atopic dermatitis on A20 FL/FL and A20EKO mice. n = 6–8. P-value of interaction analyzed by two-way analysius of variance is depicted on graph. Graphs present mean ± standard error of the mean. iLN, inguinal lymph node; OVA, ovalbumin; PBS, phosphate buffered saline. Journal of Investigative Dermatology 2019 139, 135-145DOI: (10.1016/j.jid.2018.06.191) Copyright © 2018 The Authors Terms and Conditions

Figure 4 Keratinocyte-specific A20/TNFAIP3 deficiency in combination with skin barrier disruption results in inflammation resembling interface dermatitis. (a) Back skin histology (hematoxylin and eosin, scale bar = 50 μm), (b) epidermal thickness, and (c) quantitatitve real-time reverse transcriptase–PCR analysis of inflammatory genes in whole back skin of A20Fl/Fl and A20EKO mice that were left untreated or subjected to repetitive treatment two times daily with saline or acetone wipes for 5 days. The inset magnifying the dermoepidermal junction in a shows the presence of inflammatory cells. n = 3–7. ∗P < 0.05, ∗∗P < 0.01, ∗∗∗P < 0.001 by two-way analysis of variance with Bonferroni posttest graphs present mean ± standard error of the mean. Journal of Investigative Dermatology 2019 139, 135-145DOI: (10.1016/j.jid.2018.06.191) Copyright © 2018 The Authors Terms and Conditions

Figure 5 A20/TNFAIP3 deficiency increases proinflammatory gene expression in keratinocytes. (a) Quantitative real-time reverse transcriptase–PCR analysis of inflammatory genes of primary keratinocytes derived from A20Fl/Fl and A20EKO mice. n = 5–6. ∗P < 0.05, ∗∗P < 0.01, ∗∗∗P < 0.001 by two sided t test. (b, c) Quantitative real-time reverse transcriptase–PCR analysis of indicated genes of unstimulated and in vitro IL-17A–stimulated (6 hours, 50 ng/ml) primary keratinocytes derived from A20FL/FL and A20EKO mice. n = 6. P-value of interaction analyzed by two-way analysis of variance is depicted on graph. (d, e) Quantitative real-time reverse transcriptase–PCR analysis of indicated genes of primary keratinocytes derived from A20FL/FL and A20EKO mice transfected with indicated siRNAs, unstimulated or in vitro stimulated with IL-17A (6 hours, 50 ng/ml). n = 3. ∗P < 0.05, ∗∗P < 0.01, ∗∗∗P < 0.001 by two-way analysis of variance with Bonferroni posttest. Graphs present mean ± standard error of the mean or matched individual measurements. Ctrl, control; siRNA, small interfering RNA. Journal of Investigative Dermatology 2019 139, 135-145DOI: (10.1016/j.jid.2018.06.191) Copyright © 2018 The Authors Terms and Conditions