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Ma RY, Deng ZL, Du QY, Dai MQ, Luo YY, Liang YE, Dai XZ, Guo SM, Zhao WH. Enterococcus faecalis Extracellular Vesicles Promote Apical Periodontitis. J Dent Res 2024; 103:672-682. [PMID: 38679731 DOI: 10.1177/00220345241230867] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/24/2024] Open
Abstract
Enterococcus faecalis is an important contributor to the persistence of chronic apical periodontitis. However, the mechanism by which E. faecalis infection in the root canals and dentinal tubules affects periapical tissue remains unclear. Bacterial extracellular vesicles (EVs) act as natural carriers of microbe-associated molecular patterns (MAMPs) and have recently attracted considerable attention. In this study, we investigated the role of EVs derived from E. faecalis in the pathogenesis of apical periodontitis. We observed that E. faecalis EVs can induce inflammatory bone destruction in the periapical areas of mice. Double-labeling immunofluorescence indicated that M1 macrophage infiltration was increased by E. faecalis EVs in apical lesions. Moreover, in vitro experiments demonstrated the internalization of E. faecalis EVs into macrophages. Macrophages tended to polarize toward the M1 profile after treatment with E. faecalis EVs. Pattern recognition receptors (PRRs) can recognize MAMPs of bacterial EVs and, in turn, trigger inflammatory responses. Thus, we performed further mechanistic exploration, which showed that E. faecalis EVs considerably increased the expression of NOD2, a cytoplasmic PRR, and that inhibition of NOD2 markedly reduced macrophage M1 polarization induced by E. faecalis EVs. RIPK2 ubiquitination is a major downstream of NOD2. We also observed increased RIPK2 ubiquitination in macrophages treated with E. faecalis EVs, and E. faecalis EV-induced macrophage M1 polarization was notably alleviated by the RIPK2 ubiquitination inhibitor. Our study revealed the potential for EVs to be considered a virulence factor of E. faecalis and found that E. faecalis EVs can promote macrophage M1 polarization via NOD2/RIPK2 signaling. To our knowledge, this is the first report to investigate apical periodontitis development from the perspective of bacterial vesicles and demonstrate the role and mechanism of E. faecalis EVs in macrophage polarization. This study expands our understanding of the pathogenic mechanism of E. faecalis and provides novel insights into the pathogenesis of apical periodontitis.
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Affiliation(s)
- R Y Ma
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Z L Deng
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Q Y Du
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - M Q Dai
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Y Y Luo
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Y E Liang
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - X Z Dai
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - S M Guo
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - W H Zhao
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou, China
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2
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Rademacher F, Scheel A, Gläser R, Schröder L, Heinemann N, Bartels J, Gerdes S, Stölzl D, Rodriguez E, Döhner K, Weidinger S, Werfel T, Harder J. Inhibition of RNase 7 by RNase inhibitor promotes inflammation and Staphylococcus aureus growth: Implications for atopic dermatitis. Allergy 2024; 79:1573-1583. [PMID: 38641894 DOI: 10.1111/all.16125] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2023] [Revised: 02/14/2024] [Accepted: 03/07/2024] [Indexed: 04/21/2024]
Abstract
BACKGROUND The antimicrobial ribonuclease RNase 7 is abundantly expressed in the epidermis of lesional skin of atopic dermatitis (AD). Host RNase inhibitor (RI) binds to RNase 7 and blocks its ribonuclease activity. This study aimed to evaluate the impact of RNase 7-RI interactions on AD. METHODS Cultured human primary keratinocytes, with siRNA-mediated downregulation of RNase 7 and RI, were stimulated with the synthetic RNA polyinosinic-polycytidylic acid (poly I:C). Induction of proinflammatory mediators was analyzed by real-time PCR and ELISA. RI expression in AD non-lesional and lesional skin biopsies and healthy controls was analyzed by real-time PCR and immunostaining. RI protein release in vivo on the AD skin surface was determined by western blot. Antimicrobial and ribonuclease assays were used to investigate the functional role of RI. RESULTS RNase 7 inhibited the RNA-induced expression of proinflammatory mediators in keratinocytes. Accordingly, downregulation of RNase 7 in keratinocytes enhanced RNA-mediated induction of proinflammatory mediators, whereas downregulation of RI had the opposite effect. RI was released by damaged keratinocytes and epidermis. In vivo expression and release of RI on the skin surface were enhanced in lesional AD skin. Rinsing solution from the surface of lesional AD skin blocked the ribonuclease activity of RNase 7. The anti-Staphylococcus aureus activity of RNase 7 was abrogated by RI. CONCLUSIONS Our data suggest a novel role of RI as a trigger factor of inflammation in AD by blocking the ribonuclease and antimicrobial activity of RNase 7, thereby enhancing RNA-mediated inflammation and S. aureus growth.
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Affiliation(s)
- Franziska Rademacher
- Department of Dermatology, Quincke Research Center, Kiel University, Kiel, Germany
| | - Annika Scheel
- Department of Dermatology, Quincke Research Center, Kiel University, Kiel, Germany
| | - Regine Gläser
- Department of Dermatology, Quincke Research Center, Kiel University, Kiel, Germany
| | - Lena Schröder
- Department of Dermatology, Quincke Research Center, Kiel University, Kiel, Germany
| | - Nina Heinemann
- Department of Dermatology, Quincke Research Center, Kiel University, Kiel, Germany
| | - Joachim Bartels
- Department of Dermatology, Quincke Research Center, Kiel University, Kiel, Germany
| | - Sascha Gerdes
- Department of Dermatology, Quincke Research Center, Kiel University, Kiel, Germany
| | - Dora Stölzl
- Department of Dermatology, Quincke Research Center, Kiel University, Kiel, Germany
| | - Elke Rodriguez
- Department of Dermatology, Quincke Research Center, Kiel University, Kiel, Germany
| | - Katinka Döhner
- Department of Dermatology and Allergy, Hannover Medical School, Hannover, Germany
- Hannover Medical School, Cluster of Excellence RESIST (EXC 2155), Hannover, Germany
| | - Stephan Weidinger
- Department of Dermatology, Quincke Research Center, Kiel University, Kiel, Germany
| | - Thomas Werfel
- Department of Dermatology and Allergy, Hannover Medical School, Hannover, Germany
- Hannover Medical School, Cluster of Excellence RESIST (EXC 2155), Hannover, Germany
| | - Jürgen Harder
- Department of Dermatology, Quincke Research Center, Kiel University, Kiel, Germany
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3
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Garcia EM, Lenz JD, Schaub RE, Hackett KT, Salgado-Pabón W, Dillard JP. IL-17C is a driver of damaging inflammation during Neisseria gonorrhoeae infection of human Fallopian tube. Nat Commun 2024; 15:3756. [PMID: 38704381 PMCID: PMC11069574 DOI: 10.1038/s41467-024-48141-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Accepted: 04/19/2024] [Indexed: 05/06/2024] Open
Abstract
The human pathogen Neisseria gonorrhoeae ascends into the upper female reproductive tract to cause damaging inflammation within the Fallopian tubes and pelvic inflammatory disease (PID), increasing the risk of infertility and ectopic pregnancy. The loss of ciliated cells from the epithelium is thought to be both a consequence of inflammation and a cause of adverse sequelae. However, the links between infection, inflammation, and ciliated cell extrusion remain unresolved. With the use of ex vivo cultures of human Fallopian tube paired with RNA sequencing we defined the tissue response to gonococcal challenge, identifying cytokine, chemokine, cell adhesion, and apoptosis related transcripts not previously recognized as potentiators of gonococcal PID. Unexpectedly, IL-17C was one of the most highly induced genes. Yet, this cytokine has no previous association with gonococcal infection nor pelvic inflammatory disease and thus it was selected for further characterization. We show that human Fallopian tubes express the IL-17C receptor on the epithelial surface and that treatment with purified IL-17C induces pro-inflammatory cytokine secretion in addition to sloughing of the epithelium and generalized tissue damage. These results demonstrate a previously unrecognized but critical role of IL-17C in the damaging inflammation induced by gonococci in a human explant model of PID.
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Affiliation(s)
- Erin M Garcia
- Department of Medical Microbiology and Immunology, University of Wisconsin-Madison, Madison, WI, USA
| | - Jonathan D Lenz
- Department of Medical Microbiology and Immunology, University of Wisconsin-Madison, Madison, WI, USA
| | - Ryan E Schaub
- Department of Medical Microbiology and Immunology, University of Wisconsin-Madison, Madison, WI, USA
| | - Kathleen T Hackett
- Department of Medical Microbiology and Immunology, University of Wisconsin-Madison, Madison, WI, USA
| | - Wilmara Salgado-Pabón
- Department of Pathobiological Sciences, University of Wisconsin-Madison, Madison, WI, USA
| | - Joseph P Dillard
- Department of Medical Microbiology and Immunology, University of Wisconsin-Madison, Madison, WI, USA.
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4
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Schuler CF, Tsoi LC, Billi AC, Harms PW, Weidinger S, Gudjonsson JE. Genetic and Immunological Pathogenesis of Atopic Dermatitis. J Invest Dermatol 2024; 144:954-968. [PMID: 38085213 PMCID: PMC11040454 DOI: 10.1016/j.jid.2023.10.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Revised: 10/05/2023] [Accepted: 10/25/2023] [Indexed: 02/03/2024]
Abstract
Type 2 immune-mediated diseases give a clear answer to the issue of nature (genetics) versus nurture (environment). Both genetics and environment play vital complementary roles in the development of atopic dermatitis (AD). As a key component of the atopic march, AD demonstrates the interactive nature of genetic and environmental contributions to atopy. From sequence variants in the epithelial barrier gene encoding FLG to the hygiene hypothesis, AD combines a broad array of contributions into a single syndrome. This review will focus on the genetic contribution to AD and where genetics facilitates the elicitation or enhancement of AD pathogenesis.
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Affiliation(s)
- Charles F Schuler
- Division of Allergy and Clinical Immunology, Department of Internal Medicine, Michigan Medicine, University of Michigan, Ann Arbor, Michigan, USA; Mary H. Weiser Food Allergy Center, Michigan Medicine, University of Michigan, Ann Arbor, Michigan, USA
| | - Lam C Tsoi
- Mary H. Weiser Food Allergy Center, Michigan Medicine, University of Michigan, Ann Arbor, Michigan, USA; Department of Dermatology, Michigan Medicine, University of Michigan, Ann Arbor, Michigan, USA
| | - Allison C Billi
- Department of Dermatology, Michigan Medicine, University of Michigan, Ann Arbor, Michigan, USA
| | - Paul W Harms
- Department of Dermatology, Michigan Medicine, University of Michigan, Ann Arbor, Michigan, USA; Department of Pathology, Michigan Medicine, University of Michigan, Ann Arbor, Michigan, USA
| | - Stephan Weidinger
- Department of Dermatology, Venereology, and Allergology, University Hospital Schleswig-Holstein, Kiel, Germany
| | - Johann E Gudjonsson
- Mary H. Weiser Food Allergy Center, Michigan Medicine, University of Michigan, Ann Arbor, Michigan, USA; Department of Dermatology, Michigan Medicine, University of Michigan, Ann Arbor, Michigan, USA.
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5
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Jiang Y, Gruszka D, Zeng C, Swindell WR, Gaskill C, Sorensen C, Brown W, Gangwar RS, Tsoi LC, Webster J, Sigurðardóttir SL, Sarkar MK, Uppala R, Kidder A, Xing X, Plazyo O, Xing E, Billi AC, Maverakis E, Kahlenberg JM, Gudjonsson JE, Ward NL. Suppression of TCF4 promotes a ZC3H12A-mediated self-sustaining inflammatory feedback cycle involving IL-17RA/IL-17RE epidermal signaling. JCI Insight 2024; 9:e172764. [PMID: 38470486 PMCID: PMC11141873 DOI: 10.1172/jci.insight.172764] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Accepted: 03/05/2024] [Indexed: 03/13/2024] Open
Abstract
IL-17C is an epithelial cell-derived proinflammatory cytokine whose transcriptional regulation remains unclear. Analysis of the IL17C promoter region identified TCF4 as putative regulator, and siRNA knockdown of TCF4 in human keratinocytes (KCs) increased IL17C. IL-17C stimulation of KCs (along with IL-17A and TNF-α stimulation) decreased TCF4 and increased NFKBIZ and ZC3H12A expression in an IL-17RA/RE-dependent manner, thus creating a feedback loop. ZC3H12A (MCPIP1/Regnase-1), a transcriptional immune-response regulator, also increased following TCF4 siRNA knockdown, and siRNA knockdown of ZC3H12A decreased NFKBIZ, IL1B, IL36G, CCL20, and CXCL1, revealing a proinflammatory role for ZC3H12A. Examination of lesional skin from the KC-Tie2 inflammatory dermatitis mouse model identified decreases in TCF4 protein concomitant with increases in IL-17C and Zc3h12a that reversed following the genetic elimination of Il17c, Il17ra, and Il17re and improvement in the skin phenotype. Conversely, interference with Tcf4 in KC-Tie2 mouse skin increased Il17c and exacerbated the inflammatory skin phenotype. Together, these findings identify a role for TCF4 in the negative regulation of IL-17C, which, alone and with TNF-α and IL-17A, feed back to decrease TCF4 in an IL-17RA/RE-dependent manner. This loop is further amplified by IL-17C-TCF4 autocrine regulation of ZC3H12A and IL-17C regulation of NFKBIZ to promote self-sustaining skin inflammation.
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Affiliation(s)
- Yanyun Jiang
- Department of Dermatology, Ann Arbor, Michigan, USA
- Department of Dermatology, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China
| | - Dennis Gruszka
- Departments of Nutrition and Dermatology, Case Western Reserve University, Cleveland, Ohio, USA
| | - Chang Zeng
- Department of Dermatology, Ann Arbor, Michigan, USA
| | - William R. Swindell
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Christa Gaskill
- Department of Dermatology, Vanderbilt University Medical Center, Nashville, Tennessee, USA
| | - Christian Sorensen
- Department of Dermatology, Vanderbilt University Medical Center, Nashville, Tennessee, USA
| | - Whitney Brown
- Department of Dermatology, Vanderbilt University Medical Center, Nashville, Tennessee, USA
| | - Roopesh Singh Gangwar
- Departments of Nutrition and Dermatology, Case Western Reserve University, Cleveland, Ohio, USA
| | - Lam C. Tsoi
- Department of Dermatology, Ann Arbor, Michigan, USA
| | - Joshua Webster
- Departments of Nutrition and Dermatology, Case Western Reserve University, Cleveland, Ohio, USA
| | | | | | | | | | | | | | - Enze Xing
- Department of Dermatology, Ann Arbor, Michigan, USA
| | | | - Emanual Maverakis
- Department of Dermatology, University of California Davis School of Medicine, Sacramento, California, USA
| | - J. Michelle Kahlenberg
- Division of Rheumatology, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan, USA
| | | | - Nicole L. Ward
- Departments of Nutrition and Dermatology, Case Western Reserve University, Cleveland, Ohio, USA
- Department of Dermatology, Vanderbilt University Medical Center, Nashville, Tennessee, USA
- Vanderbilt Institute for Infection, Immunology, and Inflammation (VI4) and Vanderbilt Center for Immunobiology (VCI), Vanderbilt University Medical Center, Nashville, Tennessee, USA
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6
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Malvaso D, Calabrese L, Chiricozzi A, Antonelli F, Coscarella G, Rubegni P, Peris K. IL-17 Inhibition: A Valid Therapeutic Strategy in the Management of Hidradenitis Suppurativa. Pharmaceutics 2023; 15:2450. [PMID: 37896210 PMCID: PMC10609891 DOI: 10.3390/pharmaceutics15102450] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Revised: 10/02/2023] [Accepted: 10/10/2023] [Indexed: 10/29/2023] Open
Abstract
Hidradenitis suppurativa (HS) is a chronic inflammatory skin disease with a significant negative impact on the quality of life of patients. To date, the therapeutic landscape for the management of the disease has been extremely limited, resulting in a profound unmet need. Indeed, adalimumab, an anti-tumor necrosis factor (TNF)-α monoclonal antibody, is the only approved biologic agent for HS, obtaining a therapeutic response in only 50% of HS patients. Numerous clinical trials are currently ongoing to test novel therapeutic targets in HS. The IL-17-mediated cascade is the target of several biologic agents that have shown efficacy and safety in treating moderate-to-severe HS. Both bimekizumab and secukinumab, targeting IL-17 in different manners, have successfully completed phase III trials with promising results; the latter has recently been approved by EMA for the treatment of HS. The aim of this review is to summarize the current state of knowledge concerning the relevant role of IL-17 in HS pathogenesis, highlighting the key clinical evidence of anti-IL-17 agents in the treatment of this disease.
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Affiliation(s)
- Dalma Malvaso
- Dermatologia, Dipartimento di Medicina e Chirurgia Traslazionale, Università Cattolica del Sacro Cuore, 00168 Rome, Italy; (D.M.); (L.C.); (F.A.); (G.C.); (K.P.)
- UOC di Dermatologia, Dipartimento di Scienze Mediche e Chirurgiche, Fondazione Policlinico Universitario A. Gemelli-IRCCS, 00168 Rome, Italy
| | - Laura Calabrese
- Dermatologia, Dipartimento di Medicina e Chirurgia Traslazionale, Università Cattolica del Sacro Cuore, 00168 Rome, Italy; (D.M.); (L.C.); (F.A.); (G.C.); (K.P.)
- Dermatology Unit, Department of Medical, Surgical and Neurological Sciences, University of Siena, 53100 Siena, Italy;
| | - Andrea Chiricozzi
- Dermatologia, Dipartimento di Medicina e Chirurgia Traslazionale, Università Cattolica del Sacro Cuore, 00168 Rome, Italy; (D.M.); (L.C.); (F.A.); (G.C.); (K.P.)
- UOC di Dermatologia, Dipartimento di Scienze Mediche e Chirurgiche, Fondazione Policlinico Universitario A. Gemelli-IRCCS, 00168 Rome, Italy
| | - Flaminia Antonelli
- Dermatologia, Dipartimento di Medicina e Chirurgia Traslazionale, Università Cattolica del Sacro Cuore, 00168 Rome, Italy; (D.M.); (L.C.); (F.A.); (G.C.); (K.P.)
- UOC di Dermatologia, Dipartimento di Scienze Mediche e Chirurgiche, Fondazione Policlinico Universitario A. Gemelli-IRCCS, 00168 Rome, Italy
| | - Giulia Coscarella
- Dermatologia, Dipartimento di Medicina e Chirurgia Traslazionale, Università Cattolica del Sacro Cuore, 00168 Rome, Italy; (D.M.); (L.C.); (F.A.); (G.C.); (K.P.)
- UOC di Dermatologia, Dipartimento di Scienze Mediche e Chirurgiche, Fondazione Policlinico Universitario A. Gemelli-IRCCS, 00168 Rome, Italy
| | - Pietro Rubegni
- Dermatology Unit, Department of Medical, Surgical and Neurological Sciences, University of Siena, 53100 Siena, Italy;
| | - Ketty Peris
- Dermatologia, Dipartimento di Medicina e Chirurgia Traslazionale, Università Cattolica del Sacro Cuore, 00168 Rome, Italy; (D.M.); (L.C.); (F.A.); (G.C.); (K.P.)
- UOC di Dermatologia, Dipartimento di Scienze Mediche e Chirurgiche, Fondazione Policlinico Universitario A. Gemelli-IRCCS, 00168 Rome, Italy
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7
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Miura S, Ichimura Y, Sela U, Garcet S, Salud-Gnilo C, Li X, Gonzalez J, Murai-Yamamura M, Yamamura K, Rambhia D, Kunjravia N, Krueger JG. Staphylococcus Aureus and Streptococcus Pyogenes Induce Psoriasis-Related Transcriptomes Augmented by IL-17A and TNF-α. J Invest Dermatol 2023; 143:1613-1617.e5. [PMID: 36889664 PMCID: PMC10480338 DOI: 10.1016/j.jid.2022.12.026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Revised: 12/07/2022] [Accepted: 12/30/2022] [Indexed: 03/08/2023]
Affiliation(s)
- Shunsuke Miura
- Laboratory of Investigative Dermatology, The Rockefeller University, New York, New York, USA
| | - Yohei Ichimura
- Laboratory of Investigative Dermatology, The Rockefeller University, New York, New York, USA
| | - Uri Sela
- Laboratory of Bacterial Pathogenesis and Immunology, The Rockefeller University, New York, New York, USA
| | - Sandra Garcet
- Laboratory of Investigative Dermatology, The Rockefeller University, New York, New York, USA
| | - Charissa Salud-Gnilo
- Laboratory of Investigative Dermatology, The Rockefeller University, New York, New York, USA
| | - Xuan Li
- Laboratory of Investigative Dermatology, The Rockefeller University, New York, New York, USA
| | - Juana Gonzalez
- Laboratory of Investigative Dermatology, The Rockefeller University, New York, New York, USA
| | - Mika Murai-Yamamura
- Laboratory of Investigative Dermatology, The Rockefeller University, New York, New York, USA
| | - Kazuhiko Yamamura
- Laboratory of Investigative Dermatology, The Rockefeller University, New York, New York, USA
| | - Darshna Rambhia
- Laboratory of Investigative Dermatology, The Rockefeller University, New York, New York, USA
| | - Norma Kunjravia
- Laboratory of Investigative Dermatology, The Rockefeller University, New York, New York, USA
| | - James G Krueger
- Laboratory of Investigative Dermatology, The Rockefeller University, New York, New York, USA.
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8
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NOD2 Agonism Counter-Regulates Human Type 2 T Cell Functions in Peripheral Blood Mononuclear Cell Cultures: Implications for Atopic Dermatitis. Biomolecules 2023; 13:biom13020369. [PMID: 36830738 PMCID: PMC9953199 DOI: 10.3390/biom13020369] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2022] [Revised: 01/31/2023] [Accepted: 02/03/2023] [Indexed: 02/18/2023] Open
Abstract
Atopic dermatitis (AD) is known as a skin disease; however, T cell immunopathology found in blood is associated with its severity. Skin Staphylococcus aureus (S. aureus) and associated host-pathogen dynamics are important to chronic T helper 2 (Th2)-dominated inflammation in AD, yet they remain poorly understood. This study sought to investigate the effects of S. aureus-derived molecules and skin alarmins on human peripheral blood mononuclear cells, specifically testing Th2-type cells, cytokines, and chemokines known to be associated with AD. We first show that six significantly elevated Th2-related chemokine biomarkers distinguish blood from adult AD patients compared to healthy controls ex vivo; in addition, TARC/CCL17, LDH, and PDGF-AA/AB correlated significantly with disease severity. We then demonstrate that these robust AD-associated biomarkers, as well as associated type 2 T cell functions, are readily reproduced from healthy blood mononuclear cells exposed to the alarmin TSLP and the S. aureus superantigen SEB in a human in vitro model, including IL-13, IL-5, and TARC secretion as well as OX-40-expressing activated memory T cells. We further show that the agonism of nucleotide-binding oligomerization domain-containing protein (NOD)2 inhibits this IL-13 secretion and memory Th2 and Tc2 cell functional activation while inducing significantly increased pSTAT3 and IL-6, both critical for Th17 cell responses. These findings identify NOD2 as a potential regulator of type 2 immune responses in humans and highlight its role as an endogenous inhibitor of pathogenic IL-13 that may open avenues for its therapeutic targeting in AD.
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9
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Zhang Y, Heinemann N, Rademacher F, Darvin ME, Raab C, Keck CM, Vollert H, Fluhr JW, Gläser R, Harder J, Meinke MC. Skin Care Product Rich in Antioxidants and Anti-Inflammatory Natural Compounds Reduces Itching and Inflammation in the Skin of Atopic Dermatitis Patients. Antioxidants (Basel) 2022; 11:antiox11061071. [PMID: 35739968 PMCID: PMC9219975 DOI: 10.3390/antiox11061071] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Revised: 05/23/2022] [Accepted: 05/24/2022] [Indexed: 01/29/2023] Open
Abstract
The atopic dermatitis (AD) complex pathogenesis mechanism reveals marked changes of certain signaling factors as well as some morphological alterations in the epidermis. Reduced resilience against environmental factors and oxidative stress often makes the treatment with corticosteroids or tacrolismus ointments indispensable. In view of the correlation between oxidative stress and AD pathological factors, antioxidants can be incorporated into AD management strategies. This study investigates a curly kale, apple and green tea-containing natural extract rich in antioxidants for its effects on signaling inflammatory molecules and skin barrier enhancement in human epidermal keratinocytes- (NHEKs) based cell assays. Furthermore, the skin penetration on porcine ears was measured ex vivo using Raman micro spectroscopy. Finally, in a double-blind half-side, placebo-controlled clinical study, the effects of a formulation containing this extract were analyzed for the influence of lesion severity, epidermal barrier function, and pruritus in mild to moderately AD patients. Summarizing our results: The extract reduces expression of inflammatory cytokines in keratinocytes and increases barrier-related molecules. The verum formulation with a very high antioxidant capacity used in AD patients with mild to moderate lesions reduces itching, local SCORAD, and improves barrier function and the hydration of skin lesions.
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Affiliation(s)
- Yu Zhang
- Department of Dermatology, Venerology and Allergology, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Charitéplatz 1, 10117 Berlin, Germany; (Y.Z.); (M.E.D.); (C.R.); (J.W.F.)
| | - Nina Heinemann
- Department of Dermatology, Medical Faculty, Christian-Albrecht University Kiel, Arnold-Heller-Str. 3, 24105 Kiel, Germany; (N.H.); (F.R.); (R.G.); (J.H.)
| | - Franziska Rademacher
- Department of Dermatology, Medical Faculty, Christian-Albrecht University Kiel, Arnold-Heller-Str. 3, 24105 Kiel, Germany; (N.H.); (F.R.); (R.G.); (J.H.)
| | - Maxim E. Darvin
- Department of Dermatology, Venerology and Allergology, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Charitéplatz 1, 10117 Berlin, Germany; (Y.Z.); (M.E.D.); (C.R.); (J.W.F.)
| | - Christian Raab
- Department of Dermatology, Venerology and Allergology, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Charitéplatz 1, 10117 Berlin, Germany; (Y.Z.); (M.E.D.); (C.R.); (J.W.F.)
- Department of Pharmaceutics and Biopharmaceutics, Philipps-Universität Marburg, Robert-Koch-Str. 4, 35037 Marburg, Germany;
| | - Cornelia M. Keck
- Department of Pharmaceutics and Biopharmaceutics, Philipps-Universität Marburg, Robert-Koch-Str. 4, 35037 Marburg, Germany;
| | | | - Joachim W. Fluhr
- Department of Dermatology, Venerology and Allergology, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Charitéplatz 1, 10117 Berlin, Germany; (Y.Z.); (M.E.D.); (C.R.); (J.W.F.)
- Institute of Allergy, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Hindenburgdamm 30, 12203 Berlin, Germany
| | - Regine Gläser
- Department of Dermatology, Medical Faculty, Christian-Albrecht University Kiel, Arnold-Heller-Str. 3, 24105 Kiel, Germany; (N.H.); (F.R.); (R.G.); (J.H.)
| | - Jürgen Harder
- Department of Dermatology, Medical Faculty, Christian-Albrecht University Kiel, Arnold-Heller-Str. 3, 24105 Kiel, Germany; (N.H.); (F.R.); (R.G.); (J.H.)
| | - Martina C. Meinke
- Department of Dermatology, Venerology and Allergology, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Charitéplatz 1, 10117 Berlin, Germany; (Y.Z.); (M.E.D.); (C.R.); (J.W.F.)
- Correspondence: ; Tel.: +49-30-450-518244
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10
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Stange EL, Rademacher F, Drerup KA, Heinemann N, Möbus L, Gläser R, Harder J. Staphylococcus aureus Activates the Aryl Hydrocarbon Receptor in Human Keratinocytes. J Innate Immun 2022; 14:582-592. [PMID: 35500553 PMCID: PMC9801257 DOI: 10.1159/000524033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Accepted: 03/08/2022] [Indexed: 01/03/2023] Open
Abstract
Staphylococcus aureus is an important pathogen causing various infections, including - as most frequently isolated bacterium - cutaneous infections. Keratinocytes as the first barrier cells of the skin respond to S. aureus by the release of defense molecules such as cytokines and antimicrobial peptides. Although several pattern recognition receptors expressed in keratinocytes such as Toll-like and NOD-like receptors have been reported to detect the presence of S. aureus, the mechanisms underlying the interplay between S. aureus and keratinocytes are still emerging. Here, we report that S. aureus induced gene expression of CYP1A1 and CYP1B1, responsive genes of the aryl hydrocarbon receptor (AhR). AhR activation by S. aureus was further confirmed by AhR gene reporter assays. AhR activation was mediated by factor(s) <2 kDa secreted by S. aureus. Whole transcriptome analyses and real-time PCR analyses identified IL-24, IL-6, and IL-1beta as cytokines induced in an AhR-dependent manner in S. aureus-treated keratinocytes. AhR inhibition in a 3D organotypic skin equivalent confirmed the crucial role of the AhR in mediating the induction of IL-24, IL-6, and IL-1beta upon stimulation with living S. aureus. Taken together, we further highlight the important role of the AhR in cutaneous innate defense and identified the AhR as a novel receptor mediating the sensing of the important skin pathogen S. aureus in keratinocytes.
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11
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Rademacher F, Bartels J, Gläser R, Rodewald M, Schubert S, Drücke D, Rohde H, Harder J. Staphylococcus epidermidis-derived protease Esp mediates proteolytic activation of pro-IL-1beta in human keratinocytes. J Invest Dermatol 2022; 142:2756-2765.e8. [PMID: 35490742 DOI: 10.1016/j.jid.2022.04.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Revised: 04/03/2022] [Accepted: 04/07/2022] [Indexed: 11/16/2022]
Abstract
The gram-positive bacterium Staphylococcus epidermidis (SE) is an abundant skin commensal. It plays an important role in cutaneous defense by activation of IL-1 signaling. In keratinocytes, SE induces the release of mature IL-1beta. IL-1beta serves as an important cytokine of host defense. It contains an N-terminal prodomain that has to be cleaved off to generate active mature IL-1beta. Typically, processing and release of IL-1beta are associated with inflammasome assembly and activation of the protease caspase-1. Here we report that bacterial challenge of keratinocytes with SE induced the release of mature IL-1beta in a caspase-1-independent manner. Instead, the SE -derived serine protease Esp was identified as a pro-IL-1beta processing factor leading to a proteolytic maturation of active IL-1beta. Esp production and secretion by various SE strains correlated with their capacity to induce release of mature IL-1beta in human primary keratinocytes. Reconstitution of Esp-lacking SE strains with Esp enhanced their capacity to induce IL-1beta release in keratinocytes and skin. Intracellular abundance of pro-IL-1beta and cytotoxic effects of SE suggest release of pro-IL-1beta during injury followed by extracellular Esp-mediated processing to mature IL-1beta. These findings provide further insights into how a skin commensal interacts with keratinocytes to activate cutaneous host innate defense.
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Affiliation(s)
| | | | - Regine Gläser
- Department of Dermatology, Kiel University, Kiel, Germany
| | - Meno Rodewald
- Department of Dermatology, Kiel University, Kiel, Germany
| | - Sabine Schubert
- Institute of Infection Medicine, Kiel University, Kiel, Germany
| | - Daniel Drücke
- Department of Reconstructive Surgery, University Hospital Schleswig-Holstein, Campus Kiel, Kiel, Germany
| | - Holger Rohde
- Institute for Medical Microbiology, Virology and Hygiene, University Medical Center Hamburg-Eppendorf (UKE), Hamburg, Germany
| | - Jürgen Harder
- Department of Dermatology, Kiel University, Kiel, Germany.
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12
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Singh M, Akkaya S, Preuß M, Rademacher F, Tohidnezhad M, Kubo Y, Behrendt P, Weitkamp JT, Wedel T, Lucius R, Gläser R, Harder J, Bayer A. Platelet-Released Growth Factors Influence Wound Healing-Associated Genes in Human Keratinocytes and Ex Vivo Skin Explants. Int J Mol Sci 2022; 23:ijms23052827. [PMID: 35269967 PMCID: PMC8911300 DOI: 10.3390/ijms23052827] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2022] [Revised: 03/01/2022] [Accepted: 03/01/2022] [Indexed: 02/01/2023] Open
Abstract
Platelet-released growth factors (PRGFs) or other thrombocyte concentrate products, e.g., Platelet-Rich Fibrin (PRF), have become efficient tools of regenerative medicine in many medical disciplines. In the context of wound healing, it has been demonstrated that treatment of chronic or complicated wounds with PRGF or PRF improves wound healing in the majority of treated patients. Nevertheless, the underlying cellular and molecular mechanism are still poorly understood. Therefore, we aimed to analyze if PRGF-treatment of human keratinocytes caused the induction of genes encoding paracrine factors associated with successful wound healing. The investigated genes were Semaphorin 7A (SEMA7A), Angiopoietin-like 4 (ANGPLT4), Fibroblast Growth Factor-2 (FGF-2), Interleukin-32 (IL-32), the CC-chemokine-ligand 20 (CCL20), the matrix-metalloproteinase-2 (MMP-2), the chemokine C-X-C motif chemokine ligand 10 (CXCL10) and the subunit B of the Platelet-Derived Growth Factor (PDGFB). We observed a significant gene induction of SEMA7A, ANGPLT4, FGF-2, IL-32, MMP-2 and PDGFB in human keratinocytes after PRGF treatment. The CCL20- and CXCL10 gene expressions were significantly inhibited by PRGF therapy. Signal transduction analyses revealed that the PRGF-mediated gene induction of SEMA7A, ANGPLT4, IL-32 and MMP-2 in human keratinocytes was transduced via the IL-6 receptor pathway. In contrast, EGF receptor signaling was not involved in the PRGF-mediated gene expression of analyzed genes in human keratinocytes. Additionally, treatment of ex vivo skin explants with PRGF confirmed a significant gene induction of SEMA7A, ANGPLT4, MMP-2 and PDGFB. Taken together, these results describe a new mechanism that could be responsible for the beneficial wound healing properties of PRGF or related thrombocytes concentrate products such as PRF.
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Affiliation(s)
- Michael Singh
- Institute of Anatomy, Kiel University, 24098 Kiel, Germany; (M.S.); (S.A.); (T.W.); (R.L.)
| | - Serhat Akkaya
- Institute of Anatomy, Kiel University, 24098 Kiel, Germany; (M.S.); (S.A.); (T.W.); (R.L.)
| | - Mark Preuß
- Department for Vascular Medicine, Heart and Vascular Center, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany;
| | - Franziska Rademacher
- Department of Dermatology, Venerology and Allergology, Kiel University, 24105 Kiel, Germany; (F.R.); (R.G.); (J.H.)
| | - Mersedeh Tohidnezhad
- Department of Anatomy and Cell Biology, RWTH Aachen University, 52074 Aachen, Germany; (M.T.); (Y.K.)
| | - Yusuke Kubo
- Department of Anatomy and Cell Biology, RWTH Aachen University, 52074 Aachen, Germany; (M.T.); (Y.K.)
| | - Peter Behrendt
- Department of Trauma Surgery, University Medical Center of Schleswig-Holstein, Campus Kiel, 24105 Kiel, Germany;
| | - Jan-Tobias Weitkamp
- Department of Oral and Maxillofacial Surgery, University Medical Center of Schleswig-Holstein, Campus Kiel, 24015 Kiel, Germany;
| | - Thilo Wedel
- Institute of Anatomy, Kiel University, 24098 Kiel, Germany; (M.S.); (S.A.); (T.W.); (R.L.)
| | - Ralph Lucius
- Institute of Anatomy, Kiel University, 24098 Kiel, Germany; (M.S.); (S.A.); (T.W.); (R.L.)
| | - Regine Gläser
- Department of Dermatology, Venerology and Allergology, Kiel University, 24105 Kiel, Germany; (F.R.); (R.G.); (J.H.)
| | - Jürgen Harder
- Department of Dermatology, Venerology and Allergology, Kiel University, 24105 Kiel, Germany; (F.R.); (R.G.); (J.H.)
| | - Andreas Bayer
- Institute of Anatomy, Kiel University, 24098 Kiel, Germany; (M.S.); (S.A.); (T.W.); (R.L.)
- Correspondence:
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13
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Ngo QV, Faass L, Sähr A, Hildebrand D, Eigenbrod T, Heeg K, Nurjadi D. Inflammatory Response Against Staphylococcus aureus via Intracellular Sensing of Nucleic Acids in Keratinocytes. Front Immunol 2022; 13:828626. [PMID: 35281009 PMCID: PMC8907419 DOI: 10.3389/fimmu.2022.828626] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Accepted: 02/07/2022] [Indexed: 12/02/2022] Open
Abstract
Staphylococcus aureus is one of the clinically most relevant pathogens causing infections. Humans are often exposed to S. aureus. In approximately one-third of the healthy population it can be found on the skin either for long or short periods as colonizing "commensals", without inducing infections or an inflammatory immune response. While tolerating S. aureus seems to be limited to certain individuals and time periods in most cases, Staphylococcus epidermidis is tolerated permanently on the skin of almost all individuals without activating overwhelming skin inflammation. To investigate this, we co-cultured a keratinocyte cell line (HaCaT) with viable S. aureus or S. epidermidis to study the differences in the immune activation. S. aureus activated keratinocytes depicted by a profound IL-6 and IL-8 response, whereas S. epidermidis did not. Our data indicate that internalization of S. aureus and the subsequent intracellular sensing of bacterial nucleic acid may be essential for initiating inflammatory response in keratinocytes. Internalized dsRNA activates IL-6 and IL-8 release, but not TNF-α or IFNs by human keratinocytes. This is a non-specific effect of dsRNA, which can be induced using Poly(I:C), as well as RNA from S. aureus and S. epidermidis. However, only viable S. aureus were able to induce this response as these bacteria and not S. epidermidis were actively internalized by HaCaT. The stimulatory effect of S. aureus seems to be independent of the TLR3, -7 and -8 pathways.
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Affiliation(s)
- Quang Vinh Ngo
- Department of Infectious Diseases, Medical Microbiology and Hygiene, Heidelberg University Hospital, Heidelberg, Germany
- Deutsches Zentrum für Infektionsforschung (DZIF), Department of Infectious Diseases, Heidelberg University Hospital, Heidelberg, Germany
| | - Larissa Faass
- Department of Infectious Diseases, Medical Microbiology and Hygiene, Heidelberg University Hospital, Heidelberg, Germany
- Max von Pettenkofer Institute, Chair for Medical Microbiology and Hygiene, Ludwig Maximilians University Munich, Munich, Germany
| | - Aline Sähr
- Department of Infectious Diseases, Medical Microbiology and Hygiene, Heidelberg University Hospital, Heidelberg, Germany
| | - Dagmar Hildebrand
- Department of Infectious Diseases, Medical Microbiology and Hygiene, Heidelberg University Hospital, Heidelberg, Germany
| | - Tatjana Eigenbrod
- Department of Infectious Diseases, Medical Microbiology and Hygiene, Heidelberg University Hospital, Heidelberg, Germany
| | - Klaus Heeg
- Department of Infectious Diseases, Medical Microbiology and Hygiene, Heidelberg University Hospital, Heidelberg, Germany
- Deutsches Zentrum für Infektionsforschung (DZIF), Department of Infectious Diseases, Heidelberg University Hospital, Heidelberg, Germany
| | - Dennis Nurjadi
- Department of Infectious Diseases, Medical Microbiology and Hygiene, Heidelberg University Hospital, Heidelberg, Germany
- Deutsches Zentrum für Infektionsforschung (DZIF), Department of Infectious Diseases, Heidelberg University Hospital, Heidelberg, Germany
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14
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Platelet-Released Growth Factors Induce Genes Involved in Extracellular Matrix Formation in Human Fibroblasts. Int J Mol Sci 2021; 22:ijms221910536. [PMID: 34638874 PMCID: PMC8508971 DOI: 10.3390/ijms221910536] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Revised: 09/26/2021] [Accepted: 09/27/2021] [Indexed: 02/07/2023] Open
Abstract
Platelet concentrate products are increasingly used in many medical disciplines due to their regenerative properties. As they contain a variety of chemokines, cytokines, and growth factors, they are used to support the healing of chronic or complicated wounds. To date, underlying cellular mechanisms have been insufficiently investigated. Therefore, we analyzed the influence of Platelet-Released Growth Factors (PRGF) on human dermal fibroblasts. Whole transcriptome sequencing and gene ontology (GO) enrichment analysis of PRGF-treated fibroblasts revealed an induction of several genes involved in the formation of the extracellular matrix (ECM). Real-time PCR analyses of PRGF-treated fibroblasts and skin explants confirmed the induction of ECM-related genes, in particular transforming growth factor beta-induced protein (TGFBI), fibronectin 1 (FN1), matrix metalloproteinase-9 (MMP-9), transglutaminase 2 (TGM2), fermitin family member 1 (FERMT1), collagen type I alpha 1 (COL1A1), a disintegrin and metalloproteinase 19 (ADAM19), serpin family E member 1 (SERPINE1) and lysyl oxidase-like 3 (LOXL3). The induction of these genes was time-dependent and in part influenced by the epidermal growth factor receptor (EGFR). Moreover, PRGF induced migration and proliferation of the fibroblasts. Taken together, the observed effects of PRGF on human fibroblasts may contribute to the underlying mechanisms that support the beneficial wound-healing effects of thrombocyte concentrate products.
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15
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Giantulli S, Tortorella E, Brasili F, Scarpa S, Cerroni B, Paradossi G, Bedini A, Morrone S, Silvestri I, Domenici F. Effect of 1-MHz ultrasound on the proinflammatory interleukin-6 secretion in human keratinocytes. Sci Rep 2021; 11:19033. [PMID: 34561481 PMCID: PMC8463532 DOI: 10.1038/s41598-021-98141-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Accepted: 08/02/2021] [Indexed: 02/08/2023] Open
Abstract
Keratinocytes, the main cell type of the skin, are one of the most exposed cells to environmental factors, providing a first defence barrier for the host and actively participating in immune response. In fact, keratinocytes express pattern recognition receptors that interact with pathogen associated molecular patterns and damage associated molecular patterns, leading to the production of cytokines and chemokines, including interleukin (IL)-6. Herein, we investigated whether mechanical energy transported by low intensity ultrasound (US) could generate a mechanical stress able to induce the release of inflammatory cytokine such IL-6 in the human keratinocyte cell line, HaCaT. The extensive clinical application of US in both diagnosis and therapy suggests the need to better understand the related biological effects. Our results point out that US promotes the overexpression and secretion of IL-6, associated with the activation of nuclear factor-κB (NF-κB). Furthermore, we observed a reduced cell viability dependent on exposure parameters together with alterations in membrane permeability, paving the way for further investigating the molecular mechanisms related to US exposure.
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Affiliation(s)
- Sabrina Giantulli
- grid.7841.aDepartment of Molecular Medicine, Sapienza University of Rome, Rome, Italy
| | - Elisabetta Tortorella
- grid.7841.aDepartment of Molecular Medicine, Sapienza University of Rome, Rome, Italy ,grid.6530.00000 0001 2300 0941Department of Chemical Sciences and Technologies, University of Rome Tor Vergata, Rome, Italy
| | - Francesco Brasili
- grid.6530.00000 0001 2300 0941Department of Chemical Sciences and Technologies, University of Rome Tor Vergata, Rome, Italy ,grid.7841.aDepartment of Physics, Sapienza University of Rome, Rome, Italy ,grid.5326.20000 0001 1940 4177CNR-NANOTEC, Institute of Nanotechnology, Soft and Living Matter Laboratory, Rome, Italy
| | - Susanna Scarpa
- grid.7841.aDepartment of Experimental Medicine, Sapienza University of Rome, Rome, Italy
| | - Barbara Cerroni
- grid.6530.00000 0001 2300 0941Department of Chemical Sciences and Technologies, University of Rome Tor Vergata, Rome, Italy
| | - Gaio Paradossi
- grid.6530.00000 0001 2300 0941Department of Chemical Sciences and Technologies, University of Rome Tor Vergata, Rome, Italy
| | - Angelico Bedini
- grid.425425.00000 0001 2218 2472INAIL, Italian Worker’s Compensation Authority, Rome, Italy
| | - Stefania Morrone
- grid.7841.aDepartment of Experimental Medicine, Sapienza University of Rome, Rome, Italy
| | - Ida Silvestri
- grid.7841.aDepartment of Molecular Medicine, Sapienza University of Rome, Rome, Italy
| | - Fabio Domenici
- grid.6530.00000 0001 2300 0941Department of Chemical Sciences and Technologies, University of Rome Tor Vergata, Rome, Italy
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16
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IL-17C and IL-17RE Promote Wound Closure in a Staphylococcus aureus-Based Murine Wound Infection Model. Microorganisms 2021; 9:microorganisms9091821. [PMID: 34576717 PMCID: PMC8469012 DOI: 10.3390/microorganisms9091821] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Revised: 08/06/2021] [Accepted: 08/13/2021] [Indexed: 11/17/2022] Open
Abstract
The epithelial cytokine interleukin-17C (IL-17C) mediates inflammation through the interleukin 17 receptor E (IL-17RE). Prior studies showed a detrimental role of IL-17C in the pathogenesis of immune-mediated skin diseases (e.g., psoriasis). Here, we examined the role of IL-17C/IL-17RE in wound closure in a Staphylococcus aureus wound infection model. We demonstrate that wound closure is significantly delayed in IL-17RE (Il-17re−/−)- and 17C (Il-17c−/−)-deficient mice. There was no significant difference between WT, Il-17re−/−, and Il-17c−/− mice in the absence of infection. Deficiency for IL-17RE and IL-17C did not significantly affect the elimination of bacteria. IL-17C expression was increased in the epidermis of human S. aureus-infected skin. Our results indicate that the IL-17C/IL-17RE axis contributes to the closure of infected wounds but does not contribute to the elimination of S. aureus.
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17
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Inborn Errors in the LRR Domain of Nod2 and Their Potential Consequences on the Function of the Receptor. Cells 2021; 10:cells10082031. [PMID: 34440800 PMCID: PMC8392326 DOI: 10.3390/cells10082031] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2021] [Revised: 07/30/2021] [Accepted: 08/03/2021] [Indexed: 11/24/2022] Open
Abstract
The innate immune system plays a critical role in the early detection of pathogens, primarily by relying on pattern-recognition receptor (PRR) signaling molecules. Nucleotide-binding oligomerization domain 2 (NOD2) is a cytoplasmic receptor that recognizes invading molecules and danger signals inside the cells. Recent studies highlight the importance of NOD2′s function in maintaining the homeostasis of human body microbiota and innate immune responses, including induction of proinflammatory cytokines, regulation of autophagy, modulation of endoplasmic reticulum (ER) stress, etc. In addition, there is extensive cross-talk between NOD2 and the Toll-like receptors that are so important in the induction and tuning of adaptive immunity. Polymorphisms of NOD2′s encoding gene are associated with several pathological conditions, highlighting NOD2′s functional importance. In this study, we summarize NOD2′s role in cellular signaling pathways and take a look at the possible consequences of common NOD2 polymorphisms on the structure and function of this receptor.
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18
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Hardman CS, Chen YL, Salimi M, Nahler J, Corridoni D, Jagielowicz M, Fonseka CL, Johnson D, Repapi E, Cousins DJ, Barlow JL, McKenzie ANJ, Simmons A, Ogg G. IL-6 effector function of group 2 innate lymphoid cells (ILC2) is NOD2 dependent. Sci Immunol 2021; 6:eabe5084. [PMID: 34021026 PMCID: PMC7611333 DOI: 10.1126/sciimmunol.abe5084] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2020] [Revised: 02/26/2021] [Accepted: 04/21/2021] [Indexed: 01/24/2023]
Abstract
Cutaneous group 2 innate lymphoid cells (ILC2) are spatially and epigenetically poised to respond to barrier compromise and associated immunological threats. ILC2, lacking rearranged antigen-specific receptors, are primarily activated by damage-associated cytokines and respond with type 2 cytokine production. To investigate ILC2 potential for direct sensing of skin pathogens and allergens, we performed RNA sequencing of ILC2 derived from in vivo challenged human skin or blood. We detected expression of NOD2 and TLR2 by skin and blood ILC2. Stimulation of ILC2 with TLR2 agonist alone not only induced interleukin-5 (IL-5) and IL-13 expression but also elicited IL-6 expression in combination with Staphylococcus aureus muramyl dipeptide (MDP). Heat-killed skin-resident bacteria provoked an IL-6 profile in ILC2 in vitro that was notably impaired in ILC2 derived from patients with nucleotide-binding oligomerization domain-containing protein 2 (NOD2) mutations. In addition, we show that NOD2 signaling can stimulate autophagy in ILC2, which was also impaired in patients with NOD2 mutations. Here, we have identified a role for ILC2 NOD2 signaling in the differential regulation of ILC2-derived IL-6 and have reported a previously unrecognized pathway of direct ILC2 bacterial sensing.
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Affiliation(s)
- Clare S Hardman
- MRC Human Immunology Unit, NIHR Biomedical Research Centre, Radcliffe Department of Medicine, University of Oxford, Oxford, UK
| | - Yi-Ling Chen
- MRC Human Immunology Unit, NIHR Biomedical Research Centre, Radcliffe Department of Medicine, University of Oxford, Oxford, UK
| | - Maryam Salimi
- MRC Human Immunology Unit, NIHR Biomedical Research Centre, Radcliffe Department of Medicine, University of Oxford, Oxford, UK
| | - Janina Nahler
- MRC Human Immunology Unit, NIHR Biomedical Research Centre, Radcliffe Department of Medicine, University of Oxford, Oxford, UK
| | - Daniele Corridoni
- MRC Human Immunology Unit, NIHR Biomedical Research Centre, Radcliffe Department of Medicine, University of Oxford, Oxford, UK
| | - Marta Jagielowicz
- MRC Human Immunology Unit, NIHR Biomedical Research Centre, Radcliffe Department of Medicine, University of Oxford, Oxford, UK
| | - Chathuranga L Fonseka
- MRC Human Immunology Unit, NIHR Biomedical Research Centre, Radcliffe Department of Medicine, University of Oxford, Oxford, UK
| | - David Johnson
- Department of Plastic and Reconstructive Surgery, John Radcliffe Hospital, Oxford University Hospitals NHS Trust, Oxford, UK
| | - Emmanouela Repapi
- MRC WIMM Centre for Computational Biology, MRC Weatherall Institute of Molecular Medicine, Oxford, UK
| | - David J Cousins
- Department of Infection, Immunity and Inflammation, NIHR Leicester Respiratory Biomedical Research Unit, University of Leicester, Leicester, UK
- MRC and Asthma UK Centre in Allergic Mechanisms of Asthma, King's College London, London, UK
| | | | | | - Alison Simmons
- MRC Human Immunology Unit, NIHR Biomedical Research Centre, Radcliffe Department of Medicine, University of Oxford, Oxford, UK
| | - Graham Ogg
- MRC Human Immunology Unit, NIHR Biomedical Research Centre, Radcliffe Department of Medicine, University of Oxford, Oxford, UK.
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19
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Liu ZZ, Yang YJ, Zhou FH, Ma K, Lin XQ, Yan SQ, Gao Y, Chen W. GSDMD contributes to host defence against Staphylococcus aureus skin infection by suppressing the Cxcl1-Cxcr2 axis. Vet Res 2021; 52:71. [PMID: 34011393 PMCID: PMC8132424 DOI: 10.1186/s13567-021-00937-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Accepted: 03/29/2021] [Indexed: 12/21/2022] Open
Abstract
Gasdermin D (GSDMD), a member of the gasdermin protein family, is a caspase substrate, and its cleavage is required for pyroptosis and IL-1β secretion. To date, the role and regulatory mechanism of GSDMD during cutaneous microbial infection remain unclear. Here, we showed that GSDMD protected against Staphylococcus aureus skin infection by suppressing Cxcl1–Cxcr2 signalling. GSDMD deficiency resulted in larger abscesses, more bacterial colonization, exacerbated skin damage, and increased inflammatory cell infiltration. Although GSDMD deficiency resulted in defective IL-1β production, the critical role of IL-1β was counteracted by the fact that Caspase-1/11 deficiency also resulted in less IL-1β production but did not aggravate disease severity during S. aureus skin infection. Interestingly, GSDMD-deficient mice had increased Cxcl1 secretion accompanied by increased recruitment of neutrophils, whereas Caspase-1/11-deficient mice presented similar levels of Cxcl1 and neutrophils as wild-type mice. Moreover, the absence of GSDMD promoted Cxcl1 secretion in bone marrow-derived macrophages induced by live, dead, or different strains of S. aureus. Corresponding to higher transcription and secretion of Cxcl1, enhanced NF-κB activation was shown in vitro and in vivo in the absence of GSDMD. Importantly, inhibiting the Cxcl1–Cxcr2 axis with a Cxcr2 inhibitor or anti-Cxcl1 blocking antibody rescued host defence defects in the GSDMD-deficient mice. Hence, these results revealed an important role of GSDMD in suppressing the Cxcl1–Cxcr2 axis to facilitate pathogen control and prevent tissue damage during cutaneous S. aureus infection.
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Affiliation(s)
- Zhen-Zhen Liu
- Key Laboratory of Zoonosis Research, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, China
| | - Yong-Jun Yang
- Key Laboratory of Zoonosis Research, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, China
| | - Feng-Hua Zhou
- Key Laboratory of Zoonosis Research, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, China
| | - Ke Ma
- Key Laboratory of Zoonosis Research, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, China
| | - Xiao-Qi Lin
- Key Laboratory of Zoonosis Research, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, China
| | - Shi-Qing Yan
- Key Laboratory of Zoonosis Research, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, China
| | - Yu Gao
- Key Laboratory of Zoonosis Research, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, China
| | - Wei Chen
- Key Laboratory of Zoonosis Research, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, China.
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Nod-Like Receptors in Host Defence and Disease at the Epidermal Barrier. Int J Mol Sci 2021; 22:ijms22094677. [PMID: 33925158 PMCID: PMC8124564 DOI: 10.3390/ijms22094677] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Revised: 04/18/2021] [Accepted: 04/27/2021] [Indexed: 12/16/2022] Open
Abstract
The nucleotide-binding domain and leucine-rich-repeat-containing family (NLRs) (sometimes called the NOD-like receptors, though the family contains few bona fide receptors) are a superfamily of multidomain-containing proteins that detect cellular stress and microbial infection. They constitute a critical arm of the innate immune response, though their functions are not restricted to pathogen recognition and members engage in controlling inflammasome activation, antigen-presentation, transcriptional regulation, cell death and also embryogenesis. NLRs are found from basal metazoans to plants, to zebrafish, mice and humans though functions of individual members can vary from species to species. NLRs also display highly wide-ranging tissue expression. Here, we discuss the importance of NLRs to the immune response at the epidermal barrier and summarise the known role of individual family members in the pathogenesis of skin disease.
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21
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Bugaut H, Aractingi S. Major Role of the IL17/23 Axis in Psoriasis Supports the Development of New Targeted Therapies. Front Immunol 2021; 12:621956. [PMID: 33717124 PMCID: PMC7948519 DOI: 10.3389/fimmu.2021.621956] [Citation(s) in RCA: 43] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Accepted: 01/11/2021] [Indexed: 12/12/2022] Open
Abstract
Psoriasis is a frequent, chronic disease characterized by cutaneous inflammatory plaques and/or arthritis. It may be associated with few other diseases, mainly Crohn’s disease and metabolic syndrome. The medical and psychosocial burden of psoriasis remains high even since biological treatments arose, stressing that efforts to decipher its physiopathology are constantly needed. Tumor-necrosis factor α, interleukin (IL) 12 and IL17 have been previously associated with psoriasis and successfully targeted by monoclonal antibodies. IL17 in particular has been initially described as a T helper (Th) 17—produced cytokine, but it is now established that other cell types, such as γδ T lymphocytes, Mucosal-Associated Invariant T (MAIT) cells and Innate Lymphoïd Cells (ILC) 3 are also important sources of IL17 in the skin in response to inflammatory stimuli. Th17 phenotype has been shown to be stabilized by IL23, which is synthetized by macrophages and dendritic cells in response to Toll Like Receptors and C-type Lectin Receptors stimulation. Recent data also reported a crucial role for IL23 in MAIT17 and ILC3 homeostasis. Genome-wide association studies have found a significant link between IL23 receptor polymorphism and psoriasis susceptibility. IL23 signals through Janus kinase 2 and Tyrosine kinase 2, against which specific inhibitors are currently being tested. Monoclonal antibodies against IL17 and IL23 are only the beginning of a new avenue in psoriasis treatment. This review focuses on the molecular basis underlying IL23/IL17 axis blockade in psoriasis, and on future targets in this pathway.
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Affiliation(s)
- Hélène Bugaut
- Faculté de médecine, Université de Paris, Paris, France.,Service de dermatologie, Hôpital Cochin, Paris, France.,U932 Immunité et cancer, Institut Curie, Paris, France
| | - Sélim Aractingi
- Faculté de médecine, Université de Paris, Paris, France.,Service de dermatologie, Hôpital Cochin, Paris, France.,Equipe Biologie cutanée, Institut Cochin, Inserm, UMRS1016, Paris, France
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22
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The Immune Function of Keratinocytes in Anti-Pathogen Infection in the Skin. INTERNATIONAL JOURNAL OF DERMATOLOGY AND VENEREOLOGY 2020. [DOI: 10.1097/jd9.0000000000000094] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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23
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Miller LS, Fowler VG, Shukla SK, Rose WE, Proctor RA. Development of a vaccine against Staphylococcus aureus invasive infections: Evidence based on human immunity, genetics and bacterial evasion mechanisms. FEMS Microbiol Rev 2020; 44:123-153. [PMID: 31841134 PMCID: PMC7053580 DOI: 10.1093/femsre/fuz030] [Citation(s) in RCA: 132] [Impact Index Per Article: 33.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2019] [Accepted: 12/13/2019] [Indexed: 12/12/2022] Open
Abstract
Invasive Staphylococcus aureus infections are a leading cause of morbidity and mortality in both hospital and community settings, especially with the widespread emergence of virulent and multi-drug resistant methicillin-resistant S. aureus strains. There is an urgent and unmet clinical need for non-antibiotic immune-based approaches to treat these infections as the increasing antibiotic resistance is creating a serious threat to public health. However, all vaccination attempts aimed at preventing S. aureus invasive infections have failed in human trials, especially all vaccines aimed at generating high titers of opsonic antibodies against S. aureus surface antigens to facilitate antibody-mediated bacterial clearance. In this review, we summarize the data from humans regarding the immune responses that protect against invasive S. aureus infections as well as host genetic factors and bacterial evasion mechanisms, which are important to consider for the future development of effective and successful vaccines and immunotherapies against invasive S. aureus infections in humans. The evidence presented form the basis for a hypothesis that staphylococcal toxins (including superantigens and pore-forming toxins) are important virulence factors, and targeting the neutralization of these toxins are more likely to provide a therapeutic benefit in contrast to prior vaccine attempts to generate antibodies to facilitate opsonophagocytosis.
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Affiliation(s)
- Lloyd S Miller
- Immunology, Janssen Research and Development, 1400 McKean Road, Spring House, PA, 19477, USA.,Department of Dermatology, Johns Hopkins University School of Medicine, 1550 Orleans Street, Cancer Research Building 2, Suite 209, Baltimore, MD, 21231, USA.,Department of Medicine, Division of Infectious Diseases, Johns Hopkins University School of Medicine, 1830 East Monument Street, Baltimore, MD, 21287, USA.,Department of Orthopaedic Surgery, Johns Hopkins University School of Medicine, 601 North Caroline Street, Baltimore, MD, 21287, USA.,Department of Materials Science and Engineering, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD, 21218, USA
| | - Vance G Fowler
- Department of Medicine, Division of Infectious Diseases, Duke University Medical Center, 315 Trent Drive, Hanes House, Durham, NC, 27710, USA.,Duke Clinical Research Institute, Duke University Medical Center, 40 Duke Medicine Circle, Durham, NC, 27710, USA
| | - Sanjay K Shukla
- Center for Precision Medicine Research, Marshfield Clinic Research Institute, 1000 North Oak Avenue, Marshfield, WI, 54449, USA.,Computation and Informatics in Biology and Medicine, University of Wisconsin, 425 Henry Mall, Room 3445, Madison, WI, 53706, USA
| | - Warren E Rose
- Department of Medicine, University of Wisconsin-Madison School of Medicine and Public Health, 1685 Highland Avenue, 5158 Medical Foundation Centennial Building, Madison, WI, 53705, USA.,Pharmacy Practice Division, University of Wisconsin-Madison, 777 Highland Avenue, 4123 Rennebohm Hall, Madison, WI, 53705 USA
| | - Richard A Proctor
- Department of Medicine, University of Wisconsin-Madison School of Medicine and Public Health, 1685 Highland Avenue, 5158 Medical Foundation Centennial Building, Madison, WI, 53705, USA.,Department of Medical Microbiology and Immunology, University of Wisconsin-Madison School of Medicine and Public Health, 1550 Linden Drive, Microbial Sciences Building, Room 1334, Madison, WI, 53705, USA
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24
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Platelet-Released Growth Factors and Platelet-Rich Fibrin Induce Expression of Factors Involved in Extracellular Matrix Organization in Human Keratinocytes. Int J Mol Sci 2020; 21:ijms21124404. [PMID: 32575800 PMCID: PMC7378768 DOI: 10.3390/ijms21124404] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Revised: 06/18/2020] [Accepted: 06/19/2020] [Indexed: 02/07/2023] Open
Abstract
Platelet-released growth factor (PRGF) is a thrombocyte concentrate lysate which, like its clinically equivalent variations (e.g., Vivostat PRF® (platelet-rich fibrin)), is known to support the healing of chronic and hard-to-heal wounds. However, studies on the effect of PRGF on keratinocytes remain scarce. This study aims to identify genes in keratinocytes that are significantly influenced by PRGF. Therefore, we performed a whole transcriptome and gene ontology (GO) enrichment analysis of PRGF-stimulated human primary keratinocytes. This revealed an increased expression of genes involved in extracellular matrix (ECM) organization. Real-time polymerase chain reaction (PCR) and enzyme-linked immunosorbent assay (ELISA) analysis confirmed the PRGF-mediated induction of selected ECM-related factors such as transforming growth factor beta-induced protein, fibronectin 1, matrix metalloproteinase-9, transglutaminase 2, fermitin family member 1, collagen type I alpha 1 and collagen type XXII alpha 1. PRGF-induced expression of the above factors was influenced by blockade of the epidermal growth factor receptor (EGFR), a receptor playing a crucial role in wound healing. A differential induction of the investigated factors was also detected in skin explants exposed to PRGF and in experimentally generated in vivo wounds treated with Vivostat PRF®. Together, our study indicates that the induction of ECM-related factors may contribute to the beneficial wound-healing effects of PRGF-based formulations.
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25
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Fletcher JM, Moran B, Petrasca A, Smith CM. IL-17 in inflammatory skin diseases psoriasis and hidradenitis suppurativa. Clin Exp Immunol 2020; 201:121-134. [PMID: 32379344 DOI: 10.1111/cei.13449] [Citation(s) in RCA: 70] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Revised: 04/29/2020] [Accepted: 04/29/2020] [Indexed: 12/14/2022] Open
Abstract
The skin is one of the most important organs in the body, providing integrity and acting as a barrier to exclude microbes, allergens and chemicals. However, chronic skin inflammation can result when barrier function is defective and immune responses are dysregulated or misdirected against harmless or self-antigens. During the last 15 years interleukin (IL)-17 cytokines have emerged as key players in multiple inflammatory disorders, and they appear to be especially prominent in skin inflammation. IL-17 cytokines produced by T cells and other cell types potently activate keratinocytes to promote inflammation in a feed-forward loop. Given this key pathogenic role of the IL-17 pathway in autoimmune and inflammatory disease, it has been the focus of intense efforts to target therapeutically. The inflammatory effects of IL-17 can be targeted directly by blocking the cytokine or its receptor, or indirectly by blocking cytokines upstream of IL-17-producing cells. Psoriasis has been the major success story for anti-IL-17 drugs, where they have proven more effective than in other indications. Hidradenitis suppurativa (HS) is another inflammatory skin disease which, despite carrying a higher burden than psoriasis, is poorly recognized and under-diagnosed, and current treatment options are inadequate. Recently, a key role for the IL-17 pathway in the pathogenesis of HS has emerged, prompting clinical trials with a variety of IL-17 inhibitors. In this review, we discuss the roles of IL-17A, IL-17F and IL-17C in psoriasis and HS and the strategies taken to target the IL-17 pathway therapeutically.
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Affiliation(s)
- J M Fletcher
- School of Biochemistry and Immunology, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin, Ireland.,School of Medicine, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin, Ireland
| | - B Moran
- School of Biochemistry and Immunology, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin, Ireland
| | - A Petrasca
- School of Biochemistry and Immunology, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin, Ireland
| | - C M Smith
- School of Biochemistry and Immunology, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin, Ireland
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26
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Jeon YJ, Jo A, Won J, Lee KM, Yoon SS, Choi JY, Kim HJ. IL-17C Protects Nasal Epithelium from Pseudomonas aeruginosa Infection. Am J Respir Cell Mol Biol 2020; 62:95-103. [PMID: 31318581 DOI: 10.1165/rcmb.2018-0377oc] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
IL-17 family cytokines are directly involved in host immune responses and the critical mediators for host defense against infection or inflammation. IL-17C is highly expressed in respiratory epithelium and is induced after acute bacterial lung infection. However, the definite function of IL-17C induced by Pseudomonas aeruginosa (PAO1 strain) is not fully understood, and our study was designed to demonstrate IL-17C-induced immune response against PAO1 infection in nasal epithelium. Passage-2 normal human nasal epithelial (NHNE) cells were infected with PAO1 and the relationship between IL-17C-related immune responses and the iron absorption of PAO1, depending on inoculation of recombinant human IL-17C (rhIL-17C), was assessed by measuring the siderophore activity of PAO1. Microarray data showed that IL-17C expression increased 34.7 times at 8 hours postinfection (hpi) in NHNE cells, and IL-17C mRNA levels increased until 48 hpi. The PAO1 colonies significantly increased from 8 hpi in NHNE cells, and siderophore activity of PAO1 was enhanced in the supernatants of PAO1-infected NHNE cells. Interestingly, PAO1 colonies were reduced in PAO1-infected NHNE cells treated with rhIL-17C, and supernatants from NHNE cells treated with rhIL-17C also exhibited decreased PAO1 colonies. We found that the siderophore activity of PAO1 was significantly reduced in the supernatants of NHNE cells treated with rhIL-17C where LCN2 expression was highly elevated. Our findings indicate that IL-17C mediates an antibacterial effect against PAO1 by inhibiting siderophore activity in nasal epithelium. We propose that IL-17C might be an efficient mediator to suppress PAO1 infection through disturbing iron absorption of PAO1 in nasal epithelium.
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Affiliation(s)
- Yung Jin Jeon
- Department of Otorhinolaryngology, Gyeongsang National University Hospital, Jinju, Republic of Korea
| | - Ara Jo
- Department of Otorhinolaryngology, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Jina Won
- Department of Otorhinolaryngology, Seoul National University College of Medicine, Seoul, Republic of Korea
| | | | | | - Jae Young Choi
- Department of Otorhinolaryngology, Yonsei University College of Medicine, Seoul, Republic of Korea; and
| | - Hyun Jik Kim
- Department of Otorhinolaryngology, Seoul National University College of Medicine, Seoul, Republic of Korea.,Department of Otorhinolaryngology, Seoul National University Hospital, Seoul, Republic of Korea
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27
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Jamieson KC, Wiehler S, Michi AN, Proud D. Rhinovirus Induces Basolateral Release of IL-17C in Highly Differentiated Airway Epithelial Cells. Front Cell Infect Microbiol 2020; 10:103. [PMID: 32232015 PMCID: PMC7082745 DOI: 10.3389/fcimb.2020.00103] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2019] [Accepted: 02/26/2020] [Indexed: 11/24/2022] Open
Abstract
Human rhinovirus (HRV) is a major trigger of acute exacerbations of both asthma and chronic obstructive pulmonary disease. The airway epithelium is the primary site of HRV infection, and responds by releasing proinflammatory and antimicrobial cytokines. Epithelial cells release IL-17C in response to exposure to bacterial, viral, and fungal pathogens. We previously demonstrated a role for HRV in IL-17C production from undifferentiated epithelial cells, and showed that IL-17C could play a role in neutrophil recruitment. To extend these observations, highly differentiated human bronchial epithelial cells (HBE) were infected apically with HRV to assess the effect of dose, time, viral replication, and strain on the IL-17C response. Cellular lysates, and basolateral and apical secretions were analyzed for IL-17C and CXCL1 protein release following HRV or IL-17C stimulation. Upon HRV infection, IL-17C protein was exclusively released basolaterally in a dose-, time-, and viral replication-dependent manner. Several strains of rhinovirus were capable of inducing IL-17C release. Enriched columnar epithelial cell populations contained significantly higher viral titer, and expressed significantly more IL-17C mRNA than enriched basal cell populations. In addition, the kinetic profile of IL-17C release following HRV treatment closely mimics viral shedding kinetics, further implicating the role of rhinovirus replication in IL-17C production. Basolateral treatment of HBEs with IL-17C resulted in a dose-dependent increase in basolateral CXCL1 production. In summary, replicating rhinovirus drives basolateral IL-17C protein release from both apical and basal epithelial cells, which may then act in an autocrine/paracrine manner to promote basolateral CXCL1 protein release.
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Affiliation(s)
- Kyla C Jamieson
- Department of Physiology & Pharmacology, Cumming School of Medicine, Snyder Institute for Chronic Diseases, University of Calgary, Calgary, AB, Canada
| | - Shahina Wiehler
- Department of Physiology & Pharmacology, Cumming School of Medicine, Snyder Institute for Chronic Diseases, University of Calgary, Calgary, AB, Canada
| | - Aubrey N Michi
- Department of Physiology & Pharmacology, Cumming School of Medicine, Snyder Institute for Chronic Diseases, University of Calgary, Calgary, AB, Canada
| | - David Proud
- Department of Physiology & Pharmacology, Cumming School of Medicine, Snyder Institute for Chronic Diseases, University of Calgary, Calgary, AB, Canada
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28
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Nies JF, Panzer U. IL-17C/IL-17RE: Emergence of a Unique Axis in T H17 Biology. Front Immunol 2020; 11:341. [PMID: 32174926 PMCID: PMC7054382 DOI: 10.3389/fimmu.2020.00341] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2019] [Accepted: 02/12/2020] [Indexed: 12/11/2022] Open
Abstract
Therapeutic targeting of IL-17A and its receptor IL-17RA with antibodies has turned out to be a tremendous success in the treatment of several autoimmune conditions. As the IL-17 cytokine family consists of six members (IL-17A to F), it is intriguing to elucidate the biological function of these five other molecules to identify more potential targets. In the past decade, IL-17C has emerged as quite a unique member of this pro-inflammatory cytokine group. In contrast to the well-described IL-17A and IL-17F, IL-17C is upregulated at very early timepoints of several disease settings. Also, the cellular source of the homodimeric cytokine differs from the other members of the family: Epithelial rather than hematopoietic cells were identified as the producers of IL-17C, while its receptor IL-17RE is expressed on TH17 cells as well as the epithelial cells themselves. Numerous investigations led to the current understanding that IL-17C (a) maintains an autocrine loop in the epithelium reinforcing innate immune barriers and (b) stimulates highly inflammatory TH17 cells. Functionally, the IL-17C/RE axis has been described to be involved in the pathogenesis of several diseases ranging from infectious and autoimmune conditions to cancer development and progression. This body of evidence has paved the way for the first clinical trials attempting to neutralize IL-17C in patients. Here, we review the latest knowledge about identification, regulation, and function of the IL-17C/IL-17receptor E pathway in inflammation and immunity, with a focus on the mechanisms underlying tissue injury. We also discuss the rationale for the translation of these findings into new therapeutic approaches in patients with immune-mediated disease.
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Affiliation(s)
- Jasper F Nies
- Translational Immunology, III. Department of Medicine, University Medical Center Hamburg-Eppendorf Hamburg, Hamburg, Germany
| | - Ulf Panzer
- Translational Immunology, III. Department of Medicine, University Medical Center Hamburg-Eppendorf Hamburg, Hamburg, Germany.,Hamburg Center of Translational Immunology (HCTI), University Medical Center Hamburg-Eppendorf, Hamburg, Germany
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29
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Zheng N, Zhang L, Wang B, Wang G, Liu J, Miao G, Zhao X, Liu C, Zhang L. Chlamydia pneumoniae infection promotes vascular smooth muscle cell migration via c-Fos/interleukin-17C signaling. Int J Med Microbiol 2019; 309:151340. [PMID: 31494039 DOI: 10.1016/j.ijmm.2019.151340] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Revised: 07/08/2019] [Accepted: 08/18/2019] [Indexed: 01/01/2023] Open
Abstract
Chlamydia pneumoniae (C. pneumoniae) infection is associated with the initiation and progression of atherosclerosis. The migration of vascular smooth muscle cell (VSMC) from the media to the intima is a key event in the development of atherosclerosis. Interleukin-17C (IL-17C) could enhance cell migration ability. The aim of our study is to investigate the role of IL-17C in C. pneumoniae infection-promoted VSMC migration, thereby possibly accelerating atherosclerosis. We firstly demonstrated that C. pneumoniae infection significantly increased IL-17C expression in VSMCs in the atherosclerotic lesion area from ApoE deficient mice. Our in vitro study further showed that IL-17C is required for C. pneumoniae infection-promoted VSMC migration, and its expression could be regulated by c-Fos through phosphorylating extracellular signal-regulated kinase (ERK). Unexpectedly, in the present study, we also found that IL-17C is critical for C. pneumoniae infection-induced c-Fos activation. c-Fos expression and activation induced by the exposure to recombinant IL-17C were markedly suppressed in the presence of the ERK inhibitor PD98059. These results suggest a possible positive feedback between c-Fos and IL-17C after C. pneumoniae infection. Taken together, our results indicate that C. pneumoniae infection promotes VSMC migration via c-Fos/IL-17C signaling.
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Affiliation(s)
- Ningbo Zheng
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, 300070, China
| | - Lijun Zhang
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, 300070, China
| | - Beibei Wang
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, 300070, China
| | - Guangyan Wang
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, 300070, China
| | - Jingya Liu
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, 300070, China
| | - Guolin Miao
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, 300070, China
| | - Xi Zhao
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, 300070, China
| | - Changle Liu
- Department of Cardiology, The Second Hospital of Tianjin Medical University, Tianjin, 300211, China
| | - Lijun Zhang
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, 300070, China.
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30
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Simon D, Wollenberg A, Renz H, Simon HU. Atopic Dermatitis: Collegium Internationale Allergologicum (CIA) Update 2019. Int Arch Allergy Immunol 2019; 178:207-218. [DOI: 10.1159/000497383] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2019] [Accepted: 01/30/2019] [Indexed: 11/19/2022] Open
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31
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Liu Q, Mazhar M, Miller LS. Immune and Inflammatory Reponses to Staphylococcus aureus Skin Infections. CURRENT DERMATOLOGY REPORTS 2018; 7:338-349. [PMID: 30989002 DOI: 10.1007/s13671-018-0235-8] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Purpose of Review There have been recent advances in our understanding of cutaneous immune responses to the important human skin pathogen, Staphylococcus aureus (S. aureus). This review will highlight these insights into innate and adaptive immune mechanisms in host defense and cutaneous inflammation in response to S. aureus skin infections. Recent Findings Antimicrobial peptides, pattern recognition receptors and inflammasome activation function in innate immunity as well as T cells and their effector cytokines play a key role in adaptive immunity against S. aureus skin infections. In addition, certain mechanisms by which S. aureus contributes to aberrant cutaneous inflammation, such as in flares of the inflammatory skin disease atopic dermatitis have also been identified. Summary These cutaneous immune mechanisms could provide new targets for future vaccines and immune-based therapies to combat skin infections and cutaneous inflammation caused by S. aureus.
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Affiliation(s)
- Qi Liu
- Department of Dermatology, Johns Hopkins University School of Medicine, Baltimore, MD 21231, USA
| | - Momina Mazhar
- Department of Dermatology, Johns Hopkins University School of Medicine, Baltimore, MD 21231, USA
| | - Lloyd S Miller
- Department of Dermatology, Johns Hopkins University School of Medicine, Baltimore, MD 21231, USA
- Department of Medicine, Division of Infectious Diseases, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
- Department of Orthopaedic Surgery, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
- Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD, 21218, USA
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32
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Rademacher F, Simanski M, Hesse B, Dombrowsky G, Vent N, Gläser R, Harder J. Staphylococcus epidermidis Activates Aryl Hydrocarbon Receptor Signaling in Human Keratinocytes: Implications for Cutaneous Defense. J Innate Immun 2018; 11:125-135. [PMID: 30176668 DOI: 10.1159/000492162] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Accepted: 07/14/2018] [Indexed: 12/20/2022] Open
Abstract
Bacterial challenge of keratinocytes with the abundant skin commensal Staphylococcus epidermidis induces distinct innate immune responses, but the underlying molecular mechanisms are still emerging. We report that the aryl hydrocarbon receptor (AhR) was activated in human primary keratinocytes infected with S. epidermidis, leading to induction of the AhR-responsive gene cytochrome P450 1A1 (CYP1A1). In addition, functional AhR was required for S. epidermidis-mediated induction of IL-1β expression in keratinocytes. AhR-dependent gene induction of IL-1β and CYP1A1 was mediated by factor(s) < 2 kDa secreted by S. epidermidis. Blockade of the AhR in a 3D organotypic skin equivalent infected with S. epidermidis attenuated the S. epidermidis-induced CYP1A1 and IL-1β expression. Moreover, S. epidermidis also induced expression of IL-1α and of the antimicrobial peptide human β-defensin-3 in an AhR-dependent manner in a 3D skin equivalent. An increased outgrowth of S. epidermidis on the surface of skin explants treated with a specific AhR inhibitor further indicate a pivotal role of the AhR in mediating an epidermal defense response. Taken together, our data expand the role of the AhR in innate immunity and support a previously unappreciated contribution for the AhR in cutaneous defense.
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33
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Askarian F, Wagner T, Johannessen M, Nizet V. Staphylococcus aureus modulation of innate immune responses through Toll-like (TLR), (NOD)-like (NLR) and C-type lectin (CLR) receptors. FEMS Microbiol Rev 2018; 42:656-671. [PMID: 29893825 PMCID: PMC6098222 DOI: 10.1093/femsre/fuy025] [Citation(s) in RCA: 53] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2017] [Accepted: 06/07/2018] [Indexed: 02/07/2023] Open
Abstract
Early recognition of pathogens by the innate immune system is crucial for bacterial clearance. Many pattern recognition receptors (PRRs) such as Toll-like (TLRs) and (NOD)-like (NLRs) receptors have been implicated in initial sensing of bacterial components. The intracellular signaling cascades triggered by these receptors result in transcriptional upregulation of inflammatory pathways. Although this step is crucial for bacterial elimination, it is also associated with the potential for substantial immunopathology, which underscores the need for tight control of inflammatory responses. The leading human bacterial pathogen Staphylococcus aureus expresses over 100 virulence factors that exert numerous effects upon host cells. In this manner, the pathogen seeks to avoid host recognition or perturb PRR-induced innate immune responses to allow optimal survival in the host. These immune system interactions may result in enhanced bacterial proliferation but also provoke systemic cytokine responses associated with sepsis. This review summarizes recent findings on the various mechanisms applied by S. aureus to modulate or interfere with inflammatory responses through PRRs. Detailed understanding of these complex interactions can provide new insights toward future immune-stimulatory therapeutics against infection or immunomodulatory therapeutics to suppress or correct dysregulated inflammation.
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Affiliation(s)
- Fatemeh Askarian
- Research Group of Host Microbe Interaction, Faculty of Health Sciences, UiT-The Arctic University of Norway, 9037 Tromsø, Norway
- Division of Host-Microbe Systems & Therapeutics, Department of Pediatrics, UC San Diego, La Jolla, CA 92093, USA
| | - Theresa Wagner
- Research Group of Host Microbe Interaction, Faculty of Health Sciences, UiT-The Arctic University of Norway, 9037 Tromsø, Norway
| | - Mona Johannessen
- Research Group of Host Microbe Interaction, Faculty of Health Sciences, UiT-The Arctic University of Norway, 9037 Tromsø, Norway
| | - Victor Nizet
- Division of Host-Microbe Systems & Therapeutics, Department of Pediatrics, UC San Diego, La Jolla, CA 92093, USA
- Skaggs School of Pharmacy and Pharmaceutical Sciences, UC San Diego, La Jolla, CA 92093, USA
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Brembilla NC, Senra L, Boehncke WH. The IL-17 Family of Cytokines in Psoriasis: IL-17A and Beyond. Front Immunol 2018; 9:1682. [PMID: 30127781 PMCID: PMC6088173 DOI: 10.3389/fimmu.2018.01682] [Citation(s) in RCA: 292] [Impact Index Per Article: 48.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Accepted: 07/09/2018] [Indexed: 12/14/2022] Open
Abstract
Psoriasis is a frequent chronic inflammatory skin disease, nowadays considered a major global health problem. Several new drugs, targeting the IL-23/IL-17A pathway, have been recently licensed or are in clinical development. These therapies represent a major improvement of the way in which psoriasis is managed, since they show an unprecedented efficacy on skin symptoms of psoriasis. This has been made possible, thanks to an increasingly more accurate pathogenic view of psoriasis. Today, the belief that Th17 cells mediate psoriasis is moving to the concept of psoriasis as an IL-17A-driven disease. New questions arise at the horizon, given that IL-17A is part of a newly described family of cytokines, which has five distinct homologous: IL-17B, IL-17C, IL-17D, IL-17E, also known as IL-25 and IL-17F. IL-17 family cytokines elicit similar effects in target cells, but simultaneously trigger different and sometimes opposite functions in a tissue-specific manner. This is complicated by the fact that IL-17 cytokines show a high capacity of synergisms with other inflammatory stimuli. In this review, we will summarize the current knowledge around the cytokines belonging to the IL-17 family in relation to skin inflammation in general and psoriasis in particular, and discuss possible clinical implications. A comprehensive understanding of the different roles played by the IL-17 cytokines is crucial to appreciate current and developing therapies and to allow an effective pathogenesis- and mechanisms-driven drug design.
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Affiliation(s)
| | - Luisa Senra
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Wolf-Henning Boehncke
- Department of Pathology and Immunology, Faculty of Medicine, University of Geneva, Geneva, Switzerland.,Division of Dermatology and Venereology, Geneva University Hospitals, Geneva, Switzerland
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Monin L, Gaffen SL. Interleukin 17 Family Cytokines: Signaling Mechanisms, Biological Activities, and Therapeutic Implications. Cold Spring Harb Perspect Biol 2018; 10:cshperspect.a028522. [PMID: 28620097 DOI: 10.1101/cshperspect.a028522] [Citation(s) in RCA: 206] [Impact Index Per Article: 34.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The cytokines of the interleukin 17 (IL-17) family play a central role in the control of infections, especially extracellular fungi. Conversely, if unrestrained, these inflammatory cytokines contribute to the pathology of numerous autoimmune and chronic inflammatory conditions. Recent advances have led to the approval of IL-17A-blocking biologics for the treatment of moderate to severe plaque psoriasis, but much remains to be understood about the biological functions, regulation, and signaling pathways downstream of these factors. In this review, we outline the current knowledge of signal transduction and known physiological activities of IL-17 family cytokines. We will highlight in particular the current understanding of these cytokines in the context of skin manifestations of disease.
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Affiliation(s)
- Leticia Monin
- Division of Rheumatology and Clinical Immunology, University of Pittsburgh, Pittsburgh, Pennsylvania 15261
| | - Sarah L Gaffen
- Division of Rheumatology and Clinical Immunology, University of Pittsburgh, Pittsburgh, Pennsylvania 15261
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Bayer A, Tohidnezhad M, Berndt R, Lippross S, Behrendt P, Klüter T, Pufe T, Jahr H, Cremer J, Rademacher F, Simanski M, Gläser R, Harder J. Platelet-released growth factors inhibit proliferation of primary keratinocytes in vitro. Ann Anat 2018; 215:1-7. [DOI: 10.1016/j.aanat.2017.09.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2017] [Revised: 09/02/2017] [Accepted: 09/02/2017] [Indexed: 12/22/2022]
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Noske K. Secreted immunoregulatory proteins in the skin. J Dermatol Sci 2017; 89:3-10. [PMID: 29111181 DOI: 10.1016/j.jdermsci.2017.10.008] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2017] [Accepted: 10/06/2017] [Indexed: 01/25/2023]
Abstract
The skin, thought initially to protect the body passively from pathogenic organisms and other environmental insults, is now recognised additionally as a sophisticated immune organ that actively regulates local immunity. Studies linking local innate and adaptive immunity to skin health and disease have revealed a complex network of cell communication and cytokine signalling. Here, we review the last 10 years of literature on this topic, and its relevance to skin immunity.
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Affiliation(s)
- Katharina Noske
- The University of Queensland Diamantina Institute, Translational Research Institute, Woolloongabba 4102, QLD, Australia.
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RNase 7 participates in cutaneous innate control of Corynebacterium amycolatum. Sci Rep 2017; 7:13862. [PMID: 29066761 PMCID: PMC5655327 DOI: 10.1038/s41598-017-14383-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2017] [Accepted: 10/09/2017] [Indexed: 12/21/2022] Open
Abstract
Nondiphtheria corynebacteria are typical members of the skin microbiota. However, in addition to being harmless inhabitants of healthy skin commensal skin-derived corynebacteria such as C. amycolatum occasionally also cause infections. This suggests that human skin must harbor adequate mechanisms to control the growth of corynebacteria on the skin surface. Here we show that keratinocytes are able to detect the presence of C. amycolatum leading to the epidermal growth factor receptor (EGFR)-dependent induction of the antimicrobial protein RNase 7. C. amycolatum-mediated induction of RNase 7 was also confirmed in a human 3D skin equivalent. The functional relevance of these findings was demonstrated by potent antimicrobial activity of RNase 7 against C. amycolatum and C. xerosis. In addition, the capacity of human stratum corneum to restrict the growth of C. amycolatum was significantly attenuated when RNase 7 was inactivated by a specific RNase 7-neutralizing antibody. Taken together, the interaction of RNase 7 with C. amycolatum indicates that RNase 7 may function as important effector molecule to control the growth of corynebacteria on human skin.
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Skin Immune Landscape: Inside and Outside the Organism. Mediators Inflamm 2017; 2017:5095293. [PMID: 29180836 PMCID: PMC5664322 DOI: 10.1155/2017/5095293] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2017] [Revised: 08/04/2017] [Accepted: 08/10/2017] [Indexed: 12/22/2022] Open
Abstract
The skin is an essential organ to the human body protecting it from external aggressions and pathogens. Over the years, the skin was proven to have a crucial immunological role, not only being a passive protective barrier but a network of effector cells and molecular mediators that constitute a highly sophisticated compound known as the “skin immune system” (SIS). Studies of skin immune sentinels provided essential insights of a complex and dynamic immunity, which was achieved through interaction between the external and internal cutaneous compartments. In fact, the skin surface is cohabited by microorganisms recognized as skin microbiota that live in complete harmony with the immune sentinels and contribute to the epithelial barrier reinforcement. However, under stress, the symbiotic relationship changes into a dysbiotic one resulting in skin disorders. Hence, the skin microbiota may have either positive or negative influence on the immune system. This review aims at providing basic background information on the cutaneous immune system from major cellular and molecular players and the impact of its microbiota on the well-coordinated immune responses in host defense.
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The Antimicrobial Peptide Human Beta-Defensin-3 Is Induced by Platelet-Released Growth Factors in Primary Keratinocytes. Mediators Inflamm 2017; 2017:6157491. [PMID: 28811680 PMCID: PMC5547724 DOI: 10.1155/2017/6157491] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2017] [Accepted: 07/06/2017] [Indexed: 11/17/2022] Open
Abstract
Platelet-released growth factors (PRGF) and its related clinically used formulations (e.g., Vivostat Platelet-Rich Fibrin (PRF®)) contain a variety of chemokines, cytokines, and growth factors and are therefore used to support healing of chronic, hard-to-heal, or infected wounds. Human beta-defensin-3 (hBD-3) is an antimicrobial peptide inducibly expressed in human keratinocytes especially upon wounding. The potent antimicrobial activity of hBD-3 together with its wound closure-promoting activities suggests that hBD-3 may play a crucial role in wound healing. Therefore, we analyzed the influence of PRGF on hBD-3 expression in human primary keratinocytes in vitro. In addition, we investigated the influence of Vivostat PRF on hBD-3 expression in artificially generated human skin wounds in vivo. PRGF treatment of primary keratinocytes induced a significant, concentration- and time-dependent increase in hBD-3 gene expression which was partially mediated by the epidermal growth factor receptor (EGFR). In line with these cell culture data, in vivo experiments revealed an enhanced hBD-3 expression in experimentally produced human wounds after the treatment with Vivostat PRF. Thus, the induction of hBD-3 may contribute to the beneficial effects of thrombocyte concentrate lysates in the treatment of chronic or infected wounds.
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Platelet-Released Growth Factors Induce Differentiation of Primary Keratinocytes. Mediators Inflamm 2017; 2017:5671615. [PMID: 28808357 PMCID: PMC5541813 DOI: 10.1155/2017/5671615] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2017] [Revised: 06/07/2017] [Accepted: 06/22/2017] [Indexed: 11/17/2022] Open
Abstract
Autologous thrombocyte concentrate lysates, for example, platelet-released growth factors, (PRGFs) or their clinically related formulations (e.g., Vivostat PRF®) came recently into the physicians' focus as they revealed promising effects in regenerative and reparative medicine such as the support of healing of chronic wounds. To elucidate the underlying mechanisms, we analyzed the influence of PRGF and Vivostat PRF on human keratinocyte differentiation in vitro and on epidermal differentiation status of skin wounds in vivo. Therefore, we investigated the expression of early (keratin 1 and keratin 10) and late (transglutaminase-1 and involucrin) differentiation markers. PRGF treatment of primary human keratinocytes decreased keratin 1 and keratin 10 gene expression but induced involucrin and transglutaminase-1 gene expression in an epidermal growth factor receptor- (EGFR-) dependent manner. In concordance with these results, microscopic analyses revealed that PRGF-treated human keratinocytes displayed morphological features typical of keratinocytes undergoing terminal differentiation. In vivo treatment of artificial human wounds with Vivostat PRF revealed a significant induction of involucrin and transglutaminase-1 gene expression. Together, our results indicate that PRGF and Vivostat PRF induce terminal differentiation of primary human keratinocytes. This potential mechanism may contribute to the observed beneficial effects in the treatment of hard-to-heal wounds with autologous thrombocyte concentrate lysates in vivo.
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Bitschar K, Wolz C, Krismer B, Peschel A, Schittek B. Keratinocytes as sensors and central players in the immune defense against Staphylococcus aureus in the skin. J Dermatol Sci 2017; 87:215-220. [PMID: 28655473 DOI: 10.1016/j.jdermsci.2017.06.003] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2017] [Revised: 06/02/2017] [Accepted: 06/07/2017] [Indexed: 02/08/2023]
Abstract
Healthy human skin provides an effective mechanical as well as immunologic barrier against pathogenic microorganisms with keratinocytes as the main cell type in the epidermis actively participating and orchestrating the innate immune response of the skin. As constituent of the outermost layer encountering potential pathogens they have to sense signals from the environment and must be able to initiate a differential immune response to harmless commensals and harmful pathogens. Staphylococci are among the most abundant colonizers of the skin: Whereas Staphylococcus epidermidis is part of the skin microbiota and ubiquitously colonizes human skin, Staphylococcus aureus is only rarely found on healthy human skin, but frequently colonizes the skin of atopic dermatitis (AD) patients. This review highlights recent advances in understanding how keratinocytes as sessile innate immune cells orchestrate an effective defense against S. aureus in healthy skin and the mechanisms leading to an impaired keratinocyte function in AD patients.
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Affiliation(s)
| | - Christiane Wolz
- Interfaculty Institute of Microbiology and Infection Medicine, Medical Microbiology and Hygiene, University of Tübingen, Tübingen, Germany
| | - Bernhard Krismer
- Interfaculty Institute of Microbiology and Infection Medicine, Infection Biology, University of Tübingen, Tübingen, Germany
| | - Andreas Peschel
- Interfaculty Institute of Microbiology and Infection Medicine, Infection Biology, University of Tübingen, Tübingen, Germany
| | - Birgit Schittek
- Department of Dermatology, University of Tübingen, Tübingen, Germany.
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Bayer A, Lammel J, Lippross S, Klüter T, Behrendt P, Tohidnezhad M, Pufe T, Cremer J, Jahr H, Rademacher F, Gläser R, Harder J. Platelet-released growth factors induce psoriasin in keratinocytes: Implications for the cutaneous barrier. Ann Anat 2017; 213:25-32. [PMID: 28552640 DOI: 10.1016/j.aanat.2017.04.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2017] [Revised: 04/09/2017] [Accepted: 04/20/2017] [Indexed: 01/07/2023]
Abstract
Millions of patients around the world suffer minor or major extremity amputation due to progressive wound healing complications of chronic or infected wounds, the therapy of which remains a challenge. One emerging therapeutic option for the treatment of these complicated wounds is the local application of an autologous thrombocytes concentrate lysate (e.g. platelet-released growth factors ((PRGF)) or Vivostat PRF®) that contains a multitude of chemokines, cytokines and growth factors and is therefore supposed to stimulate the complex wound healing process. Although PRGF and Vivostat PRF® are already used successfully to support healing of chronic, hard-to-heal and infected wounds the underlying molecular mechanisms are not well understood. Psoriasin, also termed S100A7, is a multifunctional antimicrobial protein expressed in keratinocytes and is involved in various processes such as wound-healing, angiogenesis, innate immunity and immune-modulation. In this study, we investigated the influence of PRGF on psoriasin expression in human primary keratinocytes in vitro and the influence of Vivostat PRF® on psoriasin expression in experimentally generated skin wounds in vivo. PRGF treatment of primary keratinocytes caused a significant concentration- and time-dependent increase of psoriasin gene and protein expression in vitro that were partially mediated by the epidermal growth factor receptor (EGFR) and the interleukin-6 receptor (IL-6R). In accordance with these cell culture data, Vivostat PRF® induced a significant psoriasin gene and protein expression when applied to artificially generated skin wounds in vivo. The observed psoriasin induction in keratinocytes may contribute to the wound healing-promoting effects of therapeutically used thrombocyte concentrate lysates.
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Affiliation(s)
- Andreas Bayer
- Department of Heart- and Vascular Surgery, University Hospital of Schleswig-Holstein, Campus Kiel, Arnold-Heller Straße 3, Haus 26, 24105 Kiel, Germany.
| | - Justus Lammel
- Department of Dermatology, University Hospital of Schleswig-Holstein, Campus Kiel, Schittenhelmstr. 7, 24105 Kiel, Germany
| | - Sebastian Lippross
- Department of Traumatology, University Hospital of Schleswig-Holstein, Campus Kiel, Arnold-Heller Straße 3, Haus 18, 24105 Kiel, Germany
| | - Tim Klüter
- Department of Traumatology, University Hospital of Schleswig-Holstein, Campus Kiel, Arnold-Heller Straße 3, Haus 18, 24105 Kiel, Germany
| | - Peter Behrendt
- Department of Traumatology, University Hospital of Schleswig-Holstein, Campus Kiel, Arnold-Heller Straße 3, Haus 18, 24105 Kiel, Germany
| | - Mersedeh Tohidnezhad
- Institute of Anatomy and Cell Biology, RWTH University of Aachen, Wendlingweg 2, 52072 Aachen, Germany
| | - Thomas Pufe
- Institute of Anatomy and Cell Biology, RWTH University of Aachen, Wendlingweg 2, 52072 Aachen, Germany
| | - Jochen Cremer
- Department of Heart- and Vascular Surgery, University Hospital of Schleswig-Holstein, Campus Kiel, Arnold-Heller Straße 3, Haus 26, 24105 Kiel, Germany
| | - Holger Jahr
- Department of Orthopedics, Aachen University Hospital, Pauwelsstr. 30, 52074 Aachen, Germany
| | - Franziska Rademacher
- Department of Dermatology, University Hospital of Schleswig-Holstein, Campus Kiel, Schittenhelmstr. 7, 24105 Kiel, Germany
| | - Regine Gläser
- Department of Dermatology, University Hospital of Schleswig-Holstein, Campus Kiel, Schittenhelmstr. 7, 24105 Kiel, Germany
| | - Jürgen Harder
- Department of Dermatology, University Hospital of Schleswig-Holstein, Campus Kiel, Schittenhelmstr. 7, 24105 Kiel, Germany
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Liao W, Hei TK, Cheng SK. Radiation-Induced Dermatitis is Mediated by IL17-Expressing γδ T Cells. Radiat Res 2017; 187:454-464. [PMID: 28406748 PMCID: PMC5524538 DOI: 10.1667/rr007cc.1] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Radiation dermatitis is a serious cutaneous injury caused by radiation therapy or upon accidental nuclear exposure. However, the pathogenic immune mechanisms underlying this injury are still poorly understood. We seek to discover how the dysregulated immune response after irradiation orchestrates skin inflammation. The skin on the left flank of C57BL/6J wild-type and C57BL/6J Tcrd-/- mice, which are deficit in γδ T cells, was exposed to a single X-ray dose of 25 Gy, and the right-flank skin was used as a sham-irradiated control. At 4 weeks postirradiation, the wild-type skin exhibited signs of depilation, erythema and desquamation. Histological analysis showed hyperproliferation of keratinocytes and acanthosis. Dramatic elevation of IL17-expressing T cells was identified from the irradiated skin, which was mainly contributed by γδ T cells and innate lymphoid cells, rather than Th17 cells. Furthermore, protein levels of critical cytokines for IL17-expressing γδ T cell activation, IL1β and IL23 were found markedly upregulated. Lastly, radiation-induced dermatitis was significantly attenuated in γδ T cell knockout mice. In vitro, normal human epidermal keratinocytes (NHEKs) could be initiator cells of inflammation by providing a great number of pro-inflammatory mediators upon radiation, and as well as effector cells of epidermal hyperplasia in response to exogenous IL17 and/or IL22 treatment. Our findings implicate a novel role of IL17-expressing γδ T cells in mediating radiation-induced skin inflammation. This study reveals the innate immune response pathway as a potential therapeutic target for radiation skin injury.
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Affiliation(s)
- Wupeng Liao
- Department of Radiation Oncology, College of Physicians and Surgeons, Columbia University, New York, New York 10032
| | - Tom K. Hei
- Center for Radiological Research, College of Physicians and Surgeons, Columbia University, New York, New York 10032
- Department of Environmental Health Sciences, Mailman School of Public Health, Columbia University, New York, New York 10032
| | - Simon K. Cheng
- Department of Radiation Oncology, College of Physicians and Surgeons, Columbia University, New York, New York 10032
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Rademacher F, Simanski M, Schröder L, Mildner M, Harder J. The role of RNase 7 in innate cutaneous defense againstPseudomonas aeruginosa. Exp Dermatol 2017; 26:227-233. [DOI: 10.1111/exd.13166] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/01/2016] [Indexed: 12/30/2022]
Affiliation(s)
| | - Maren Simanski
- Department of Dermatology; University of Kiel; Kiel Germany
| | - Lena Schröder
- Department of Dermatology; University of Kiel; Kiel Germany
| | - Michael Mildner
- Department of Dermatology; Medical University of Vienna; Vienna Austria
| | - Jürgen Harder
- Department of Dermatology; University of Kiel; Kiel Germany
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Manz J, Rodríguez E, ElSharawy A, Oesau EM, Petersen BS, Baurecht H, Mayr G, Weber S, Harder J, Reischl E, Schwarz A, Novak N, Franke A, Weidinger S. Targeted Resequencing and Functional Testing Identifies Low-Frequency Missense Variants in the Gene Encoding GARP as Significant Contributors to Atopic Dermatitis Risk. J Invest Dermatol 2016; 136:2380-2386. [DOI: 10.1016/j.jid.2016.07.009] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2016] [Revised: 06/14/2016] [Accepted: 07/05/2016] [Indexed: 02/07/2023]
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Bayer A, Lammel J, Rademacher F, Groß J, Siggelkow M, Lippross S, Klüter T, Varoga D, Tohidnezhad M, Pufe T, Cremer J, Gläser R, Harder J. Platelet-released growth factors induce the antimicrobial peptide human beta-defensin-2 in primary keratinocytes. Exp Dermatol 2016; 25:460-5. [PMID: 26843467 DOI: 10.1111/exd.12966] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/29/2016] [Indexed: 12/12/2022]
Abstract
Platelet-released growth factors (PRGF) and its related clinically used formulations [e.g. Vivostat platelet-rich fibrin (PRF(®) )] are thrombocyte concentrate lysates that support healing of chronic, hard-to-heal and infected wounds. Human beta-defensin-2 (hBD-2) is an antimicrobial peptide expressed in human keratinocytes exhibiting potent antimicrobial activity against wound-related bacteria. In this study, we analysed the influence of PRGF on hBD-2 expression in human primary keratinocytes and the influence of Vivostat PRF(®) on hBD-2 expression in experimentally generated skin wounds in vivo. Treatment of primary keratinocytes with PRGF caused a significant increase in hBD-2 gene and protein expressions in a concentration- and time-dependent manner. The use of blocking antibodies revealed that the PRGF-mediated hBD-2 induction was partially mediated by the epidermal growth factor receptor and the interleukin-6 receptor (IL-6R). Luciferase gene reporter assays indicated that the hBD-2 induction through PRGF required activation of the transcription factor activator protein 1 (AP-1), but not of NF-kappaB. In concordance with these cell culture data, Vivostat PRF(®) induced hBD-2 expression when applied to experimentally generated skin wounds. Together, our results indicate that the induction of hBD-2 by thrombocyte concentrate lysates can contribute to the observed beneficial effects in the treatment of chronic and infected wounds.
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Affiliation(s)
- Andreas Bayer
- Department of Heart- and Vascular Surgery, University Hospital of Schleswig-Holstein, Kiel, Germany
| | - Justus Lammel
- Department of Dermatology, University Hospital of Schleswig-Holstein, Kiel, Germany
| | - Franziska Rademacher
- Department of Dermatology, University Hospital of Schleswig-Holstein, Kiel, Germany
| | - Justus Groß
- Department of Heart- and Vascular Surgery, University Hospital of Schleswig-Holstein, Kiel, Germany
| | - Markus Siggelkow
- Department of Vascular and Thoracic Surgery, Imland Clinic Rendsburg, Rendsburg, Germany
| | - Sebastian Lippross
- Department of Traumatology, University Hospital of Schleswig-Holstein, Kiel, Germany
| | - Tim Klüter
- Department of Traumatology, University Hospital of Schleswig-Holstein, Kiel, Germany
| | - Deike Varoga
- Department of Traumatology, University Hospital of Schleswig-Holstein, Kiel, Germany
| | - Mersedeh Tohidnezhad
- Institute of Anatomy and Cell Biology, RWTH University of Aachen, Aachen, Germany
| | - Thomas Pufe
- Institute of Anatomy and Cell Biology, RWTH University of Aachen, Aachen, Germany
| | - Jochen Cremer
- Department of Heart- and Vascular Surgery, University Hospital of Schleswig-Holstein, Kiel, Germany
| | - Regine Gläser
- Department of Dermatology, University Hospital of Schleswig-Holstein, Kiel, Germany
| | - Jürgen Harder
- Department of Dermatology, University Hospital of Schleswig-Holstein, Kiel, Germany
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The roles and functional mechanisms of interleukin-17 family cytokines in mucosal immunity. Cell Mol Immunol 2016; 13:418-31. [PMID: 27018218 DOI: 10.1038/cmi.2015.105] [Citation(s) in RCA: 98] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2015] [Revised: 11/21/2015] [Accepted: 11/21/2015] [Indexed: 01/12/2023] Open
Abstract
The mucosal immune system serves as our front-line defense against pathogens. It also tightly maintains immune tolerance to self-symbiotic bacteria, which are usually called commensals. Sensing both types of microorganisms is modulated by signalling primarily through various pattern-recognition receptors (PRRs) on barrier epithelial cells or immune cells. After sensing, proinflammatory molecules such as cytokines are released by these cells to mediate either defensive or tolerant responses. The interleukin-17 (IL-17) family members belong to a newly characterized cytokine subset that is critical for the maintenance of mucosal homeostasis. In this review, we will summarize recent progress on the diverse functions and signals of this family of cytokines at different mucosal edges.
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Simanski M, Rademacher F, Schröder L, Gläser R, Harder J. The Inflammasome and the Epidermal Growth Factor Receptor (EGFR) Are Involved in the Staphylococcus aureus-Mediated Induction of IL-1alpha and IL-1beta in Human Keratinocytes. PLoS One 2016; 11:e0147118. [PMID: 26808616 PMCID: PMC4726826 DOI: 10.1371/journal.pone.0147118] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2015] [Accepted: 11/16/2015] [Indexed: 01/31/2023] Open
Abstract
Staphylococcus (S.) aureus is an important pathogen causing various infections including those of the skin. Keratinocytes are able to sense invading S. aureus and to initiate a fast defense reaction by the rapid release of innate defense mediators such as antimicrobial peptides and cytokines. There is increasing evidence that the cytokines IL-1alpha and IL-1beta, which both signal through the IL-1 receptor, play an important role in cutaneous defense against S. aureus. The aim of this study was to gain more insight into the underlying mechanisms leading to the S. aureus-induced IL-1alpha and IL-1beta expression in keratinocytes. Infection of human primary keratinocytes with S. aureus led to the induction of gene expression and protein secretion of IL-1alpha and IL-1beta. Full S. aureus-induced IL-1 protein release required the inflammasome components caspase-1 and ASC (apoptosis-associated speck-like protein containing a CARD) whereas gene induction of IL-1alpha and IL-beta by S. aureus was not dependent on caspase-1 and ASC. Since patients receiving anti-cancer therapy by inhibition of the epidermal growth factor receptor (EGFR) often suffer from skin infections caused by S. aureus we additionally evaluated whether the EGFR pathway may be involved in the IL-1alpha and IL-1beta induction by S. aureus. Inactivation of the EGFR with a blocking antibody decreased the S. aureus-mediated IL-1alpha and IL-1beta induction in primary keratinocytes. Moreover, the use of siRNA experiments revealed that ADAM17 (A Disintegrin and A Metalloprotease 17), a metalloproteinase known to mediate the shedding and release of EGFR ligands, was required for full induction of IL-1alpha and IL-1beta in keratinocytes infected with S. aureus. A failure of keratinocytes to adequately upregulate IL-1alpha and IL-1beta may promote S. aureus skin infections.
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Affiliation(s)
- Maren Simanski
- Department of Dermatology, University of Kiel, Kiel, Germany
| | | | - Lena Schröder
- Department of Dermatology, University of Kiel, Kiel, Germany
| | - Regine Gläser
- Department of Dermatology, University of Kiel, Kiel, Germany
| | - Jürgen Harder
- Department of Dermatology, University of Kiel, Kiel, Germany
- * E-mail:
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Abstract
PURPOSE OF REVIEW Research on atopic dermatitis is actively growing and continuously completing our knowledge on the pathophysiology of this complex disease. RECENT FINDINGS Genome-wide association studies revealed new susceptibility loci for atopic dermatitis. In addition, different tissue-specific patterns of DNA methylation have been identified as first evidence for the relevance of epigenetic modifications in atopic dermatitis. Moreover, interest is emerging on the role of the skin and gut microbiome in atopic dermatitis. Signals mediated via pattern recognition receptors of the innate immune system have been analyzed in more detail, and the role of cytokines, such as IL-22, IL-25, IL-31 and IL-33 as well as innate lymphoid cells, has been studied. SUMMARY Taken together, better knowledge of atopic dermatitis pathways will form the basis for the development of rationale-based therapeutic approaches in the future.
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