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      The relevance of complement in pemphigoid diseases: A critical appraisal

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          Abstract

          Pemphigoid diseases are autoimmune chronic inflammatory skin diseases, which are characterized by blistering of the skin and/or mucous membranes, and circulating and tissue-bound autoantibodies. The well-established pathomechanisms comprise autoantibodies targeting various structural proteins located at the dermal-epidermal junction, leading to complement factor binding and activation. Several effector cells are thus attracted and activated, which in turn inflict characteristic tissue damage and subepidermal blistering. Moreover, the detection of linear complement deposits in the skin is a diagnostic hallmark of all pemphigoid diseases. However, recent studies showed that blistering might also occur independently of complement. This review reassesses the importance of complement in pemphigoid diseases based on current research by contrasting and contextualizing data from in vitro, murine and human studies.

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              Pemphigoid diseases.

              Pemphigoid diseases are a group of well defined autoimmune disorders that are characterised by autoantibodies against structural proteins of the dermal-epidermal junction and, clinically, by tense blisters and erosions on skin or mucous membranes close to the skin surface. The most common of these diseases is bullous pemphigoid, which mainly affects older people and the reported incidence of which in Europe has more than doubled in the past decade. Prognosis and treatments vary substantially between the different disorders and, since clinical criteria are usually not sufficient, direct immunofluorescence microscopy of a perilesional biopsy specimen or serological tests are needed for exact diagnosis. In eight pemphigoid diseases the target antigens have been identified molecularly, which has allowed the development of standard diagnostic assays for detection of serum autoantibodies-some of which are commercially available. In this Seminar we discuss the clinical range, diagnostic criteria, diagnostic assay systems, and treatment options for this group of diseases. Copyright © 2013 Elsevier Ltd. All rights reserved.
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                Author and article information

                Contributors
                Journal
                Front Immunol
                Front Immunol
                Front. Immunol.
                Frontiers in Immunology
                Frontiers Media S.A.
                1664-3224
                16 August 2022
                2022
                : 13
                : 973702
                Affiliations
                [1] 1 Department of Dermatology, University of Lübeck , Lübeck, Germany
                [2] 2 Department of Dermatology, Iuliu Hatieganu University of Medicine and Pharmacy , Cluj-Napoca, Romania
                [3] 3 Institute of Systemic Inflammation Research, University of Lübeck , Lübeck, Germany
                [4] 4 Department of Dermatology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University , Sapporo, Japan
                [5] 5 Lübeck Institute of Experimental Dermatology (LIED), University of Lübeck , Lübeck, Germany
                [6] 6 Division of Antibody-Based Immunotherapy, Department of Medicine II, Christian-Albrechts-University of Kiel and University Medical Center Schleswig-Holstein , Kiel, Germany
                [7] 7 Department of Otorhinolaryngology, Klinikum rechts der Isar, Technical University Munich , Munich, Germany
                [8] 8 Division of Immunobiology, Cincinnati Children’s Hospital Medical Center and University of Cincinnati College of Medicine, Cincinnati , OH, United States
                Author notes

                Edited by: Takashi Hashimoto, Osaka City University, Japan

                Reviewed by: Jong Hoon Kim, Yonsei University, South Korea; Zhi Liu, University of North Carolina at Chapel Hill, United States; Ana Maria Abreu-Velez, Georgia Dermatopathology Associates (GDA), United States

                *Correspondence: Christoph M. Hammers, christoph.hammers@ 123456uksh.de

                This article was submitted to Autoimmune and Autoinflammatory Disorders, a section of the journal Frontiers in Immunology

                Article
                10.3389/fimmu.2022.973702
                9434693
                36059476
                a55f1741-ccbd-479a-8be0-62c8631058b6
                Copyright © 2022 Papara, Karsten, Ujiie, Schmidt, Schmidt-Jiménez, Baican, Freire, Izumi, Bieber, Peipp, Verschoor, Ludwig, Köhl, Zillikens and Hammers

                This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

                History
                : 20 June 2022
                : 26 July 2022
                Page count
                Figures: 2, Tables: 0, Equations: 0, References: 154, Pages: 13, Words: 5865
                Categories
                Immunology
                Review

                Immunology
                complement,relevance,pemphigoid,bullous pemphigoid,bp,eba,mmp,pathophysiology
                Immunology
                complement, relevance, pemphigoid, bullous pemphigoid, bp, eba, mmp, pathophysiology

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