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Cutting Edge: ABIN-1 Protects against Psoriasis by Restricting MyD88 Signals in Dendritic Cells

Joseph A. Callahan, Gianna E. Hammer, Alexander Agelides, Bao H. Duong, Shigeru Oshima, Jeffrey North, Rommel Advincula, Nataliya Shifrin, Hong-An Truong, Jonathan Paw, Julio Barrera, Anthony DeFranco, Michael D. Rosenblum, Barbara A. Malynn and Averil Ma
J Immunol July 15, 2013, 191 (2) 535-539; DOI: https://doi.org/10.4049/jimmunol.1203335
Joseph A. Callahan
*Department of Medicine, University of California, San Francisco, San Francisco, CA 94143;
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Gianna E. Hammer
*Department of Medicine, University of California, San Francisco, San Francisco, CA 94143;
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Alexander Agelides
*Department of Medicine, University of California, San Francisco, San Francisco, CA 94143;
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Bao H. Duong
*Department of Medicine, University of California, San Francisco, San Francisco, CA 94143;
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Shigeru Oshima
*Department of Medicine, University of California, San Francisco, San Francisco, CA 94143;
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Jeffrey North
†Department of Dermatology, University of California, San Francisco, San Francisco, CA 94143; and
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Rommel Advincula
*Department of Medicine, University of California, San Francisco, San Francisco, CA 94143;
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Nataliya Shifrin
*Department of Medicine, University of California, San Francisco, San Francisco, CA 94143;
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Hong-An Truong
†Department of Dermatology, University of California, San Francisco, San Francisco, CA 94143; and
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Jonathan Paw
†Department of Dermatology, University of California, San Francisco, San Francisco, CA 94143; and
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Julio Barrera
*Department of Medicine, University of California, San Francisco, San Francisco, CA 94143;
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Anthony DeFranco
‡Department of Microbiology and Immunology, University of California, San Francisco, San Francisco, CA 94143
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Michael D. Rosenblum
†Department of Dermatology, University of California, San Francisco, San Francisco, CA 94143; and
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Barbara A. Malynn
*Department of Medicine, University of California, San Francisco, San Francisco, CA 94143;
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Averil Ma
*Department of Medicine, University of California, San Francisco, San Francisco, CA 94143;
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Abstract

Psoriasis is a chronic, inflammatory skin disease caused by a combination of environmental and genetic factors. The Tnip1 gene encodes A20 binding and inhibitor of NF-κB-1 (ABIN-1) protein and is strongly associated with susceptibility to psoriasis in humans. ABIN-1, a widely expressed ubiquitin-binding protein, restricts TNF- and TLR-induced signals. In this study, we report that mice lacking ABIN-1 specifically in dendritic cells (DCs), ABIN-1fl CD11c-Cre mice, exhibit perturbed immune homeostasis. ABIN-1–deficient DCs display exaggerated NF-κB and MAPK signaling and produce more IL-23 than do normal cells in response to TLR ligands. Challenge of ABIN-1fl CD11c-Cre mice with topical TLR7 ligand leads to greater numbers of Th17 and TCRγδ T cells and exacerbated development of psoriaform lesions. These phenotypes are reversed by DC-specific deletion of the TLR adaptor MyD88. These studies link ABIN-1 with IL-23 and IL-17, and they provide cellular and molecular mechanisms by which ABIN-1 regulates susceptibility to psoriasis.

Introduction

Psoriasis is a common immune-mediated skin disorder whose complex pathophysiology involves environmental factors, including microbes, as well as host susceptibility factors, including genetically determined immunologic propensities (1, 2). Recent genome-wide association studies have highlighted potential roles of specific proteins in disease pathogenesis, including HLA-C, IL-12β, TNIP1/A20 binding and inhibitor of NF-κB-1 (ABIN-1), TNFAIP3/A20, IL-23α, and IL-23R (3). Some of these polymorphisms are also linked to therapeutic responses of psoriasis patients to specific therapies (4). These findings emphasize the immunological nature of psoriasis and implicate specific immune functions, such as HLA-C–mediated Ag presentation and IL-12/IL-23–dependent innate immune signals. Because innate immune cells such as dendritic cells (DCs) are outstanding APCs, and because IL-12 and IL-23 are secreted by innate immune cells to amplify T cell activation and differentiation events, these genetic clues suggest that aberrant DCs and T cell functions are integral to psoriasis.

TNIP1, which encodes the ABIN-1 protein, is strongly linked to psoriasis in both European (combined genome-wide p value of 1 × 10−20) and Chinese (combined genome-wide p value of 3.8 × 10−21) populations (5–7). ABIN-1 restricts several NF-κB signaling cascades and regulates cell survival (8–12). In vitro studies suggest that ABIN-1 can bind NEMO/IKKγ and inhibit TNF-induced NF-κB signaling (13). ABIN-1 can also bind ubiquitin chains, and ubiquitin binding by ABIN-1 is important for the ability of ABIN-1 to restrict TNF and TLR signals (11, 12). Global loss or mutation of ABIN-1 leads to either embryonic lethality or spontaneous inflammation and autoimmunity (11, 12, 14). These studies indicated that ABIN-1 plays critical roles in regulating TNF and TLR signals. However, the mechanisms by which ABIN-1 regulates physiological immune homeostasis and psoriasis susceptibility are unknown.

DCs have long been recognized as important cells for triggering immune responses during overt immunizations or infections (15). Recent studies suggest that DCs also preserve immune homeostasis under basal conditions (16–21). DCs may regulate susceptibility to psoriasis by secreting type I IFNs, TNF, or other proinflammatory cytokines, as well as by stimulating skin T cells (22). Given the potential importance of DCs to immune homeostasis in the skin and the potential importance of ABIN-1 polymorphisms to psoriasis, we have investigated whether ABIN-1 expression in DCs may regulate psoriasis susceptibility.

Materials and Methods

Mice

The initial targeting of the Tnip1 (ABIN-1) gene in C57BL/6N PRX-B6T embryonic stem cells was previously described (11). ABIN-1–targeted embryonic stem cells were transfected with an EF1α-Cre expression construct (20), and colonies were screened for deletion of the neomycin gene and retention of ABIN-1 exons 12–15 flanked by LoxP sites (floxed allele). Genotypes were confirmed both by Southern blot analyses and by PCR (primers: 5′-TTGATTCCCCTTCGCCCATTCCAGC-3′, 5′-CCTCAAACAGCAGAAGAGGAAAGC-3′, and 5′-ATGGGTGGGTAGGCATAGGGATAG-3′). MyD88fl mice were described previously (23). All mouse experiments were approved by the University of California, San Francisco Institutional Care and Use Committee.

Cell preparation and analyses

Cell preparations and flow cytometric analyses were performed as previously described (20). Immunoblots were performed as described (11). Abs to surface markers (BD Biosciences), actin (Calbiochem), phospho-IκBα, IκBα, phospho-Erk, Erk, phospho-JNK, and JNK (Cell Signaling Technologies) were purchased.

Imiquimod treatment and scoring of skin inflammation

Imiquimod (IMQ) treatments were performed largely as previously described (24, 25). Mice received a daily topical dose of 12.5 μg IMQ cream (5%) (Perrigo) or lotion control for 12 consecutive days. Skin inflammation was scored using a previously described scoring system (24). Histological sections were prepared by the University of California, San Francisco Veterans Affairs Medical Center Pathology Core.

Results and Discussion

To investigate whether ABIN-1 expression in DCs regulates immune functions in vivo, we generated mice bearing LoxP sites flanking exons 12–15 of ABIN-1 (ABIN-1fl) mice and bred them with CD11c-Cre transgenic mice to create mice lacking ABIN-1 in DCs (Supplemental Fig. 1A) (26). ABIN-1fl/fl CD11c-Cre mice appeared grossly normal for up to 6 mo of age. Conventional DCs (cDCs; CD11chiMHC class II+) and plasmacytoid DCs (pDCs; CD11cloB220hi) were present in slightly elevated numbers in spleens from ABIN-1fl/fl CD11c-Cre mice (Fig. 1A). These cells expressed relatively normal levels of activation markers, with the exception of minimally elevated levels of CD40 on cDCs and slightly lower CD80 levels on pDCs (Supplemental Fig. 1B, 1C). Thus, ABIN-1 expression in DCs is not required for DC development but modestly regulates DC activation under basal conditions. ABIN-1fl/fl CD11c-Cre mice developed splenomegaly and lymphadenopathy by 3–4 mo of age, accumulating myeloid (CD11b+Gr-1+) cells and memory phenotype T cells (Fig. 1B–D and data not shown). Thus, ABIN-1 expression in DCs preserves myeloid and lymphoid immune homeostasis.

FIGURE 1.
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FIGURE 1.

ABIN-1 expression in DCs is necessary to preserve immune homeostasis. (A) Flow cytometric quantitation of MHC class II+CD11chi cDCs and MHC class II+CD11cdimB220+ pDCs in spleens from indicated mice. (B) Spleens from indicated mice. (C) Flow cytometric analyses of myeloid, T cell, and B cell splenic subpopulations. (D) Quantitation of naive (CD44lo) and memory phenotype (CD44hi or m.p.) T cells. Error bars represent SEM. Open bars indicate ABIN-1+/+ CD11c-Cre+ mice; shaded bars indicate control ABIN-1fl/fl CD11c-Cre+ mice. Data are representative of five to six pairs of 8- to 16-wk-old mice in three to seven independent experiments. *p < 0.05 by Student t test.

DCs are activated by TLR ligands during overt immunizations and infections and may also respond to MyD88-dependent signals under basal conditions (20). We asked whether ABIN-1 preserves immune homeostasis by restricting MyD88-dependent signals in DCs by generating compound ABIN-1fl/flMyD88fl/fl CD11c-Cre mice that lack both ABIN-1 and MyD88 specifically in DCs. Remarkably, in contrast to ABIN-1fl/fl CD11c-Cre mice, the spontaneous accumulation of myeloid cells and activated T lymphocytes observed in ABIN-1fl/fl CD11c-Cre mice was abrogated in ABIN-1fl/flMyD88fl/fl CD11c-Cre mice (Fig. 2, Supplemental Fig. 2A, 2B). Thus, ABIN-1 restricts basal Myd88-dependent intracellular signals in DCs, thereby preserving immune homeostasis in unperturbed mice.

FIGURE 2.
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FIGURE 2.

ABIN-1 restricts MyD88-dependent signals in DCs. (A) Spleen mass of indicated genotypes. (B) Number of myeloid cells in spleens of indicated mice determined by flow cytometry. (C and D) Number of memory phenotype CD4+ (C) and CD8+ (D) T cells in pooled axillary, brachial, and inguinal lymph nodes. All mice are CD11c-Cre+. Error bars represent SEM. All data are representative of three independent experiments. *p < 0.05 by Student t test.

To determine how ABIN-1 restricts MyD88-dependent signals in DCs, we tested the responses of ABIN-1−/− and ABIN-1+/+ bone marrow–derived DCs (BMDCs) to the TLR4 ligand LPS. LPS-stimulated ABIN-1−/− BMDCs secreted more TNF, IL-6, IL-12, and IL-23 than did control BMDCs (Supplemental Fig. 2D). This is consistent with a recent report showing that ABIN-1 restricts TLR-induced IL-6 and TNF (12). Importantly, our current study implicates ABIN-1 in restricting IL-23 production by DCs. After LPS stimulation, ABIN-1−/− BMDCs also exhibited exaggerated NF-κB, JNK, and p38 (but not ERK) signaling when compared with control BMDCs (Supplemental Fig. 2C). Hence, ABIN-1 regulates TLR responses in DCs by restricting TLR-induced NF-κB and MAPK signals.

Given the genetic linkage of ABIN-1 to psoriasis and the exaggerated production of IL-12 and IL-23 by ABIN−/− DCs, we asked whether ABIN-1 expression in DCs regulates susceptibility to experimental psoriasis. Topical treatment with the TLR7 ligand IMQ can cause a psoriasis-like condition in humans and causes similar lesions in mice. This is now an established mouse model of psoriasis (24, 27). To investigate the functions of radiation-sensitive DCs, we generated radiation chimera bearing hemopoietic stem cells from ABIN-1fl/fl CD11c-Cre or ABIN-1+/+ CD11c-Cre mice. Treatment of mice with IMQ caused markedly increased erythema, scaling, and skin thickening in ABIN-1fl/fl CD11c-Cre chimera, which combine to yield increased composite psoriasis scores in ABIN-1fl/fl CD11c-Cre mice compared with control chimera (Fig. 3A). Histologic examination of skin sections from these mice revealed epidermal hyperplasia, hypogranulosis, hyperkeratosis, and parakeratosis with neutrophils—all stereotypical histologic findings of human psoriasis—in ABIN-1fl/fl CD11c-Cre mice but not in control mice (Fig. 3B–G). Treatment of mice with a topical emollient as control did not lead to significant clinical responses. Hence, ABIN-1 expression in DCs prevents susceptibility to experimental psoriasis.

FIGURE 3.
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FIGURE 3.

ABIN-1 restricts IMQ responses in DCs and prevents experimental psoriasis. (A) Clinical scores of IMQ-induced skin inflammation in ABIN-1fl/fl CD11c-Cre+ and ABIN-1+/+ CD11c-Cre+ (control) mice at indicated days of IMQ treatment. (B–G) H&E-stained sections of back skin of mice of indicated genotypes from areas treated with IMQ. Epithelial layer (epi) is indicated by brackets (B–G). Epidermal hyperplasia (thickening of epidermal layer) is evident in ABIN-1fl/fl mice (C, E, G) compared with ABIN-1+/+ mice (B, D, F). In (C), (E), and (G), open arrows show hyperkeratotic scaling. In (E), broad areas of hypogranulosis (abnormal loss of purple keratohyaline granules in the skin’s granular layer) are indicated by closed arrows. In (G), neutrophils (blue arrow) and parakeratosis (abnormal retention of nuclei in the outermost layer of skin, green arrow) are shown in Munro’s microabscess (dotted boxed area). Scale bar, 0.1 mm for (D)–(G). Scale bar, 0.5 mm for (B) and (C). (H) ELISA and multiplex Luminex analyses of cytokine production from BMDCs after treatment with the indicated doses of IMQ. (I) Numbers of CD3+ and CD4+ T cells from skin-draining lymph nodes from IMQ-treated mice of indicated genotypes. Numbers of Th17 (CD4+IL-17+), TCRγ/δ+ (CD3+GL-3+), and Th1 (CD4+IFN-γ+) T cells from skin-draining lymph nodes from IMQ-treated mice. Distinct Th2 (CD4+IL-4+) populations were not detected. All mice in (A)–(G) and (I) are CD11c-Cre+ radiation chimera. All data are representative of three to seven independent experiments. Error bars represent SD. *p < 0.05 by Student t test.

IMQ-induced psoriasis involves IL-23–dependent production of IL-17 (24). We thus measured the levels of inflammatory cytokines produced by ABIN-1−/− BMDCs compared with control BMDCs in response to IMQ. IMQ stimulated higher levels of IL-23, IL-6, IL-12p70, and TNF secretion from ABIN-1−/− BMDCs compared with wild-type BMDCs, whereas IL-12p40 levels were similar (Fig. 3H). We next tested the induction of IL-17 expression in IMQ-treated mice. Whereas the total numbers of T cells in skin-draining lymph nodes were similar in ABIN-1fl/fl CD11c-Cre and ABIN-1+/+ CD11c-Cre chimera, increased numbers and percentages of CD4+ Th17 cells were observed in ABIN-1fl/fl CD11c-Cre mice (Fig. 3I). Many IL-17–producing T cells in IMQ-treated mice are epidermal TCRγ/δ+ T cells (28). Consistent with this notion, increased percentages and numbers of TCRγ/δ+ T cells were noted in draining lymph nodes from ABIN-1fl/fl CD11c-Cre mice (Fig. 3I). In contrast, analyses of the skin-draining lymph nodes from IMQ-treated ABIN-1fl/fl CD11c-Cre mice showed approximately normal Th1 (IFN-γ+) cell numbers and no significant numbers of Th2 (IL-4+) cells (Fig. 3I and data not shown). Finally, consistent with the role of IL-17 in supporting neutrophil recruitment, ABIN-1fl/fl CD11c-Cre mice contained increased epidermal neutrophilic microabscesses (Fig. 3G). Thus, ABIN-1 expression in DCs restricts IL-23 secretion, Th17 cell differentiation, neutrophilic inflammation, and psoriatic lesions after IMQ treatment.

To determine whether ABIN-1–dependent regulation of MyD88-dependent signals in DCs was integral to disease pathogenesis, we tested the IMQ responses of chimera generated from ABIN-1fl/flMyD88fl/fl CD11c-Cre compound mutant and control hematopoietic stem cells. Double mutant ABIN-1fl/flMyD88fl/fl CD11c-Cre mice exhibited much less psoriasis than did ABIN-1fl/fl CD11c-Cre mice (Fig. 4A). Indeed, ABIN-1fl/flMyD88fl/fl CD11c-Cre mice exhibited similar clinical responses to MyD88fl/fl CD11c-Cre and wild-type chimera (Fig. 4A, Supplemental Fig. 2E). Histological studies confirmed the reduced inflammation observed in ABIN-1fl/flMyD88fl/fl CD11c-Cre mice compared with ABIN-1fl/fl CD11c-Cre mice (Fig. 4B). Thus, ABIN-1–dependent regulation of MyD88-dependent signals in DCs regulates susceptibility to experimental psoriasis.

FIGURE 4.
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FIGURE 4.

ABIN-1 restricts MyD88 signals in DCs to prevent IMQ-induced psoriasis. (A) Clinical skin inflammation scores in the indicated genotypes of mice at the indicated days of IMQ treatment. (B) H&E-stained sections of back skin of mice of indicated genotypes after treatment. Epithelial layer denoted by brackets and “epi.” Note that skin inflammation in ABIN-1fl/flMyD88+/+ mice is abrogated in ABIN-1fl/flMyD88fl/fl mice. All mice are CD11c-Cre+. Error bars represent SD. *p < 0.05 by Student t test. Scale bar, 0.1 mm. Data are representative of three independent experiments.

Our findings indicate that ABIN-1 restricts MyD88-dependent signals in DCs. ABIN-1 expression in DCs restricts TLR-induced NF-κB and JNK signals, thereby limiting DC expression of IL-23 and other cytokines. IL-23 supports the accumulation of IL-17– and IL-22–producing T cells. IL-17 induces epidermal neutrophil infiltration, and IL-22 alters keratinocyte proliferation and differentiation. Thus, exaggerated IL-23 expression likely leads to characteristic dermal lesions of psoriasis (29). Our studies mechanistically link ABIN-1, a major psoriasis susceptibility gene, with IL-23α and IL-23R, two other major psoriasis susceptibility genes. This linkage suggests that ABIN-1 and IL-23–dependent inflammation may be part of a common dominant pathophysiological pathway leading to psoriasis. These cellular and molecular insights into how ABIN-1 prevents psoriasis provide mechanistic insights for the genetic suggestions about psoriasis pathophysiology. Moreover, mice bearing ABIN-1 mutations should be extremely valuable models for studying psoriasis pathophysiology and treatment.

Disclosures

The authors have no financial conflicts of interest.

Acknowledgments

We thank Sandra Huling and Ivy Hsieh of the University of California, San Francisco Veterans Affairs Medical Center Pathology Core for excellent assistance with histological studies.

Footnotes

  • This work was supported by grants from the National Institutes of Health (to A.M.) and by the Histopathology and Immunology Cores of the University of California, San Francisco Liver Center. G.E.H. was supported by National Institutes of Health Grant T32 DK007007. J.A.C. was partially supported by a National Science Foundation predoctoral fellowship.

  • The online version of this article contains supplemental material.

  • Abbreviations used in this article:

    ABIN-1
    A20 binding and inhibitor of NF-κB-1
    BMDC
    bone marrow–derived dendritic cell
    cDC
    conventional dendritic cell
    DC
    dendritic cell
    IMQ
    imiquimod
    pDC
    plasmacytoid dendritic cell.

  • Received December 14, 2012.
  • Accepted May 13, 2013.
  • Copyright © 2013 by The American Association of Immunologists, Inc.

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The Journal of Immunology: 191 (2)
The Journal of Immunology
Vol. 191, Issue 2
15 Jul 2013
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Cutting Edge: ABIN-1 Protects against Psoriasis by Restricting MyD88 Signals in Dendritic Cells
Joseph A. Callahan, Gianna E. Hammer, Alexander Agelides, Bao H. Duong, Shigeru Oshima, Jeffrey North, Rommel Advincula, Nataliya Shifrin, Hong-An Truong, Jonathan Paw, Julio Barrera, Anthony DeFranco, Michael D. Rosenblum, Barbara A. Malynn, Averil Ma
The Journal of Immunology July 15, 2013, 191 (2) 535-539; DOI: 10.4049/jimmunol.1203335

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Cutting Edge: ABIN-1 Protects against Psoriasis by Restricting MyD88 Signals in Dendritic Cells
Joseph A. Callahan, Gianna E. Hammer, Alexander Agelides, Bao H. Duong, Shigeru Oshima, Jeffrey North, Rommel Advincula, Nataliya Shifrin, Hong-An Truong, Jonathan Paw, Julio Barrera, Anthony DeFranco, Michael D. Rosenblum, Barbara A. Malynn, Averil Ma
The Journal of Immunology July 15, 2013, 191 (2) 535-539; DOI: 10.4049/jimmunol.1203335
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