Kaname Ohyama1, Miyako Baba2, Mami Tamai3, Nozomi Aibara2, Kunihiro Ichinose3, Naoya Kishikawa2, Atsushi Kawakami3, Naotaka Kuroda4. 1. Course of Pharmaceutical Sciences, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan; Nagasaki University Research Centre for Genomic Instability and Carcinogenesis (NRGIC), Japan. 2. Course of Pharmaceutical Sciences, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan. 3. Unit of Translational Medicine, Department of Immunology and Rheumatology, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan. 4. Course of Pharmaceutical Sciences, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan. Electronic address: n-kuro@nagasaki-u.ac.jp.
Abstract
OBJECTIVE: Immune complexes (ICs) trigger humoral immune responses. Therefore, the identification of constituent antigens within ICs would have very different clinical significance than identification of free antigens. DESIGN AND METHODS: Here, we applied immune complexome analysis of serum to the study of seven major autoimmune diseases-anti-neutrophil cytoplasmic antibody-associated vasculitis, Takayasu's arteritis, mixed connective tissue disease, dermatomyositis, Sjögren's syndrome, systemic scleroderma, and systemic lupus erythematosus-and healthy donors to comprehensively identify antigens incorporated into circulating ICs and to find disease-specific antigens. RESULTS: We identified 468 distinct IC-associated antigens using this method. Importantly, 62 of those antigens were disease-specific antigens, and there were at least three disease-specific antigens for each of the seven autoimmune diseases. Of the disease-specific antigens identified, coiled-coil domain-containing protein 158 and spectrin were identified as potential autoantigens important to SSc and SS pathogenesis, respectively; notable titin and spectrin autoantibodies are reportedly found in SSc and SS patients, respectively. CONCLUSION: Immune complexome analysis may be generally applicable to the study of the relationship between ICs and autoimmune diseases in animals and humans.
OBJECTIVE: Immune complexes (ICs) trigger humoral immune responses. Therefore, the identification of constituent antigens within ICs would have very different clinical significance than identification of free antigens. DESIGN AND METHODS: Here, we applied immune complexome analysis of serum to the study of seven major autoimmune diseases-anti-neutrophil cytoplasmic antibody-associated vasculitis, Takayasu's arteritis, mixed connective tissue disease, dermatomyositis, Sjögren's syndrome, systemic scleroderma, and systemic lupus erythematosus-and healthy donors to comprehensively identify antigens incorporated into circulating ICs and to find disease-specific antigens. RESULTS: We identified 468 distinct IC-associated antigens using this method. Importantly, 62 of those antigens were disease-specific antigens, and there were at least three disease-specific antigens for each of the seven autoimmune diseases. Of the disease-specific antigens identified, coiled-coil domain-containing protein 158 and spectrin were identified as potential autoantigens important to SSc and SS pathogenesis, respectively; notable titin and spectrin autoantibodies are reportedly found in SSc and SS patients, respectively. CONCLUSION: Immune complexome analysis may be generally applicable to the study of the relationship between ICs and autoimmune diseases in animals and humans.
Authors: K Yamane; H Nakamura; M Hamasaki; Y Minei; N Aibara; T Shimizu; A Kawakami; M Nakashima; N Kuroda; K Ohyama Journal: Clin Exp Immunol Date: 2021-02-22 Impact factor: 4.330
Authors: N Aibara; K Ohyama; M Nakamura; H Nakamura; M Tamai; N Kishikawa; A Kawakami; K Tsukamoto; M Nakashima; N Kuroda Journal: Clin Exp Immunol Date: 2021-03-22 Impact factor: 5.732