Self-Antigen Presentation by Keratinocytes in the Inflamed Adult Skin Modulates T-Cell Auto-Reactivity  Michael Meister, Amel Tounsi, Evelyn Gaffal, Tobias.

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Self-Antigen Presentation by Keratinocytes in the Inflamed Adult Skin Modulates T-Cell Auto-Reactivity  Michael Meister, Amel Tounsi, Evelyn Gaffal, Tobias Bald, Maria Papatriantafyllou, Julia Ludwig, Georg Pougialis, Felix Bestvater, Luisa Klotz, Gerhard Moldenhauer, Thomas Tüting, Günter J. Hämmerling, Bernd Arnold, Thilo Oelert  Journal of Investigative Dermatology  Volume 135, Issue 8, Pages 1996-2004 (August 2015) DOI: 10.1038/jid.2015.130 Copyright © 2015 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 1 MBP-IAu β-chain transgene expression in Ker-MBP mice is skin restricted. (a) MBP-IAu β-chain transgenic construct. (b) Schematic illustration of the Ker-MBP mouse model. (c) Semi-Quantitative real-time reverse-transcriptase–PCR (qRT-PCR) of the MBP-IAu β-chain in indicated tissues of Ker-MBP and wild-type (WT) mice. (d) Representative immunofluorescence stains for MBP1-10 (green), keratin-15 (red), and nuclei (blue) in the skin of Ker-MBP and control mice (Bar = 200 μm). (e) In all 5 × 107 carboxyfluorescein succinimidyl ester (CFSE)-labeled splenocytes from Tg4 mice were transferred i.v. into Ker-MBP mice. The next day shaved abdomen of mice was treated with oxazolone (OXA, 3%) or diphenylcycloprenone (DPCP, 2%) or was left untreated. Five days later, CFSE profiles of Tg4 CD4+ T cells isolated from draining lymph nodes (LN) and the skin were analyzed (representative experiment; ND, not detected). (f) In all 5 × 107 CFSE labeled Tg4 splenocytes were co-transferred with MBP1-10-peptide–loaded dendritic cells into Ker-MBP mice. Representative CFSE dilution of Tg4 T cells from LN 5 days after transfer. Journal of Investigative Dermatology 2015 135, 1996-2004DOI: (10.1038/jid.2015.130) Copyright © 2015 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 2 Functional myelin basic protein peptide (MBP1-10) presentation in Ker-MBP mice only occurs upon contact sensitizer treatment. (a) Representative dot plots of CD8 and Vβ8.2 versus CD4 expression on thymocytes of Tg4xKer-MBP and Tg4 control mice. (b) Representative dot plots of Vβ8.2 versus CD4 expression and histograms of CD44 and CD62L expression on CD4 T cells from lymph nodes of Tg4xKer-MBP and Tg4 control mice. (c) Tg4xKer-MBP and Tg4 were immunized by MBP1-10/CFA subcutaneous injection (t0) and experimental autoimmune encephalomyelitis (EAE) symptoms were monitored. Mean clinical score±SEM is plotted over time. (n=8, not significant). (d) Representative histology of the skin of Tg4xKer-MBP and Tg4 mice 8 days after single application of oxazolone (3%). Infiltration of leukocyte populations was analyzed using hematoxylin/eosin (Bar = 100 μm), anti-MAC-3 (Bar = 100 μm), or anti-CD4 (red) staining (Bar=25 μm). Journal of Investigative Dermatology 2015 135, 1996-2004DOI: (10.1038/jid.2015.130) Copyright © 2015 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 3 Repeated induction of myelin basic protein peptide (MBP1-10) presentation limits the severity of subsequent experimental autoimmune encephalomyelitis (EAE) in Ker-MBP mice. (a) EAE was induced in Ker-MBP and wild-type (WT) mice (t0), and symptoms were monitored. Mean clinical score±SEM is plotted over time (data pooled from two individual experiments, n=12). (b) The skin of Ker-MBP and WT mice was four times pre-treated with diphenylcycloprenone (DPCP; each 1 week apart). Seven days later, EAE was induced (t0). Mean clinical EAE score±SEM is plotted over time (data pooled from three individual experiments, n=18). (c) Quantitative real-time reverse-transcriptase–PCR of H2-Aa in the skin of Ker-MBP and WT mice 7 days after 4 DPCP times pre-treatment. Expression levels are calculated relative to Actb (n=6). (d) Seven days after 4 times DPCP pre-treatment, 3% oxazolone (OXA) was applied to back skin of Ker-MBP and WT mice. One week later, the right ear was challenged by 1% OXA and ear thickness was monitored. As a control, ears of untreated-WT–mice were challenged. Ear thickness±SEM is plotted over time (data pooled from 2 individual experiments, n=10). Journal of Investigative Dermatology 2015 135, 1996-2004DOI: (10.1038/jid.2015.130) Copyright © 2015 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 4 Diphenylcycloprenone (DPCP) pre-treatment of Ker-MBP mice induces a dominant form of tolerance. (a) Ten days after MBP1-10/CFA immunization of B10.PL mice, splenocytes were taken out and re-stimulated in vitro for 3 days in the presence of MBP1-10 peptide and IL-12. Subsequently, activated splenocytes were transferred intravenously into Ker-MBP or wild-type (WT) mice (t0), which were 4 times pre-treated with DPCP. Mean clinical experimental autoimmune encephalomyelitis (EAE) score±SEM is plotted over time (n=10). (b) Ker-MBP and WT mice were 4 times pre-treated with DPCP. One week later, CD4+ T cells from the spleen and lymph nodes were transferred into WT recipients. EAE was subsequently induced (t0) and clinical EAE score was monitored (data pooled from three individual experiments, n=18). (c) Percentages of CD25+FOXP3+CD4+ T cells in the spleen and lymph nodes of Ker-MBP and WT mice, 4 times pre-treated with DPCP (n=6). (d) Quantitative real-time reverse-transcriptase–PCR (QRT-PCR) of Foxp3 in the skin of Ker-MBP and WT mice pre-treated like in c. Expression levels are relative to Actb (n=6). (e) QRT-PCR on RNA isolated from total skin of DPCP pre-treated or untreated Ker-MBP and WT mice. Expression levels of indicated genes are relative to Actb (n=6–12). (f) Dickkopf-3 (DKK3) concentration in serum of untreated and 4 times DPCP pre-treated Ker-MBP and WT mice, measured by ELISA (n=4). (g) QRT-PCR of Dkk3 in CD4+ T cells isolated from untreated and 4 times DPCP pre-treated Ker-MBP and WT mice. As negative control, CD4+ T cells isolated from untreated Dkk3−/− mice were used. As positive control, total skin of 4 times DPCP pre-treated mice was used (n=3). Journal of Investigative Dermatology 2015 135, 1996-2004DOI: (10.1038/jid.2015.130) Copyright © 2015 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 5 Reduction of the myelin basic protein (MBP)-specific CD4+ T–cell response in Ker-MBP mice depends on Dickkopf-3 (DKK3). (a) Ker-MBPxDkk3−/−, Dkk3−/−, Ker-MBP, and wild-type (WT) mice were 4 times pre-treated with diphenylcycloprenone (DPCP) before induction of experimental autoimmune encephalomyelitis (EAE) (t0). Mean clinical score±SEM is plotted over time (data pooled from 2 individual experiments, n=12). (b) Ker-MBP and WT mice were 4 times pre-treated with DPCP. In both groups, a measure of 500 μg of anti-Dkk3 mAb clone 4.22 was applied intraperitoneally along with the first three DPCP applications. One week after the fourth application, EAE was induced (t0) and symptoms were monitored. Mean clinical score±SEM is plotted over time (data pooled from 2 individual experiments, n=16). (c) Quantitative real-time reverse-transcriptase–PCR of H2-Aa in the skin of Ker-MBP.Dkk3−/− and Dkk3−/− mice 7 days after 4 times DPCP pre-treatment. Expression levels were calculated relative to Actb (n=6). (d) Ker-MBP and Ker-MBP.Dkk3−/− mice were 4 times pre-treated with DPCP or left untreated and EAE was induced. Seven days later, splenocytes were in vitro re-stimulated with MBP1-10 peptide and analyzed by flow cytometry. Depicted are the percentages of IL-2, tumor necrosis factor, and IL-17–producing CD4+ T cells (data pooled from three individual experiments, n=6). Journal of Investigative Dermatology 2015 135, 1996-2004DOI: (10.1038/jid.2015.130) Copyright © 2015 The Society for Investigative Dermatology, Inc Terms and Conditions