Cytoprotective IgG antibodies in sera from a subset of patients with AQP4-IgG seropositive neuromyelitis optica spectrum disorder
| العنوان: | Cytoprotective IgG antibodies in sera from a subset of patients with AQP4-IgG seropositive neuromyelitis optica spectrum disorder |
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| المؤلفون: | Lukmanee Tradtrantip, Alan S. Verkman, Michael R. Yeaman |
| المصدر: | Scientific Reports, Vol 11, Iss 1, Pp 1-14 (2021) Scientific Reports |
| بيانات النشر: | Nature Portfolio, 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | Science, Neuroimmunology, CHO Cells, Article, Immunoglobulin G, Medical research, Cricetulus, medicine, Animals, Humans, Cytotoxic T cell, Cytotoxicity, Autoantibodies, Aquaporin 4, Multidisciplinary, Neuromyelitis optica, biology, business.industry, Immune Sera, Neuromyelitis Optica, Autoantibody, medicine.disease, Complement system, Neurology, Immunology, Monoclonal, Disease Progression, biology.protein, Medicine, sense organs, Antibody, business, Biomarkers |
| الوصف: | Neuromyelitis optica spectrum disorder (NMOSD) is an autoimmune inflammatory disease of the central nervous system. Most NMOSD patients are seropositive for immunoglobulin G (IgG) autoantibodies against astrocyte water channel aquaporin-4 (AQP4), called AQP4-IgG. AQP4-IgG binding to aquaporin-4 causes complement-dependent cytotoxicity (CDC), leading to inflammation and demyelination. Here, CDC was measured in AQP4-expressing cells exposed to human complement and heat-inactivated sera from 108 AQP4-IgG seropositive NMOSD subjects and 25 non-NMOSD controls. AQP4-IgG positive sera produced a wide range of CDC, with 50% maximum cytotoxicity produced by as low as 0.2% serum concentration. Unexpectedly, 58 samples produced no cytotoxicity, and of those, four sera were cytoprotective against cytotoxic AQP4-IgG. Cytoprotection was found against different cytotoxic monoclonal AQP4-IgGs and NMOSD patient sera, and in primary astrocyte cultures. Mechanistic studies revealed that the protective factor is an IgG antibody that did not inhibit complement directly, but interfered with binding of cytotoxic AQP4-IgG to AQP4 and consequent C1q binding and complement activation. Further studies suggested that non-pathogenic AQP4-IgG, perhaps with altered glycosylation, may contribute to reduced or ineffectual binding of cytotoxic AQP4-IgG, as well as reduced cell-surface AQP4. The presence of natural cytoprotective antibodies in AQP4-IgG seropositive sera reveals an added level of complexity in NMOSD disease pathogenesis, and suggests the potential therapeutic utility of ‘convalescent’ serum or engineered protective antibody to interfere with pathogenic antibody in AQP4-IgG seropositive NMOSD. |
| اللغة: | English |
| تدمد: | 2045-2322 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7b0bdc63a4e078ca882c4d471d5d41c7 https://doaj.org/article/3ee501b270e4462e877685fc11073ca9 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....7b0bdc63a4e078ca882c4d471d5d41c7 |
| قاعدة البيانات: | OpenAIRE |
Find this article in full text from Springer Verlag. | تدمد: | 20452322 |
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