title: Cicatricial pemphigoid differs from bullous pemphigoid and pemphigoid gestationis regarding the fine specificity of autoantibodies to the BP180 NC16A domain.
abstract: Bullous pemphigoid (BP), pemphigoid (herpes) gestationis (PG), cicatricial pemphigoid (CP), and lichen planus pemphigoides (LPP) are autoimmune subepidermal bullous diseases that are characterized by circulating autoantibodies to the transmembrane hemidesmosomal protein BP180/type XVII collagen. Previous studies demonstrated that the majority of patients with BP, PG, and LPP show antibodies to an immunodominant, membrane-proximal non-collagenous domain (NC16A) on the extracellular portion of BP180. By the use of non-overlapping peptides of the NC16A domain, we previously demonstrated that autoantibodies from BP and PG patients mainly react with epitopes clustered within the N-terminus of this immunodominant site of BP180; antibodies from patients with LPP also recognized the C-terminal portion of NC16A. However, some of these results had been obtained indirectly by preadsorption studies. The aim of the present study was to analyze the fine specificity of IgG autoantibodies to NC16A in sera from patients with CP and to compare their reactivity with antibodies from BP, PG, and LPP patients using a series of new overlapping fragments covering the entire NC16A domain. We confirm that BP and PG sera mainly react with N-terminal epitopes of NC16A, whereas sera from patients with LPP also bind to C-terminal portions, of this domain. Interestingly, out of ten patients with CP, the sera of seven reacted with NC16A; within NC16A, these sera bound to both C-terminal fragments and an N-terminal epitope right next to the cell membrane. Our data demonstrate a heterogeneous binding pattern of autoantibodies to BP180 NC16A in patients with CP.
authors.affiliation: Institute for Immunology, Clinical Pathology and Molecular Medicine (IPM), Hamburg, Germany. arno.kromminga@gmx.de
authors.forename: Arno
authors.initials: A
authors.lastname: Kromminga
authors.forename: Cassian
authors.initials: C
authors.lastname: Sitaru
authors.forename: Jutta
authors.initials: J
authors.lastname: Meyer
authors.forename: Rüdiger
authors.initials: R
authors.lastname: Arndt
authors.forename: Enno
authors.initials: E
authors.lastname: Schmidt
authors.forename: Enno
authors.initials: E
authors.lastname: Christophers
authors.forename: Eva-B
authors.initials: EB
authors.lastname: Bröcker
authors.forename: Detlef
authors.initials: D
authors.lastname: Zillikens
mesh_terms: D000918:Antibody Specificity; D001323:Autoantibodies / Q000276:immunology*; D001324:Autoantigens / Q000737:chemistry / Q000235:genetics / Q000276:immunology*; D018076:DNA, Complementary / Q000378:metabolism; D005260:Female; D006801:Humans; D008010:Lichen Planus / Q000276:immunology; D024041:Non-Fibrillar Collagens; D006559:Pemphigoid Gestationis / Q000276:immunology*; D010390:Pemphigoid, Benign Mucous Membrane / Q000276:immunology*; D010391:Pemphigoid, Bullous / Q000276:immunology*; D011247:Pregnancy; D017434:Protein Structure, Tertiary / Q000502:physiology; D000097805:Collagen Type XVII
chemical_list: D001323:Autoantibodies; D001324:Autoantigens; D018076:DNA, Complementary; D024041:Non-Fibrillar Collagens; D000097805:Collagen Type XVII