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Antibodies against MLC1 found in patients with NMOSD-like disease mediate astrocytopathy in rodent models.
Sci. Transl. Med. 18:eady0403 (2026)
The identification of autoantibodies against aquaporin-4 (AQP4) and myelin oligodendrocyte glycoprotein (MOG) has been essential in distinguishing neuromyelitis optica spectrum disorder (NMOSD) and MOG antibody-associated disease (MOGAD) from classical multiple sclerosis (MS), with important implications for treatment. However, for several patients within this disease spectrum, the target of the autoimmune response remains unknown. Here, we describe the modulator of VRAC current 1 (MLC1), a membrane protein with extracellular epitopes enriched at astrocytic end feet, as an autoantigen. Serum MLC1 antibodies were verified with a cell-based assay, identifying four MLC1 immunoglobulin G (IgG)-positive patients among 297 patients with inflammatory autoimmune diseases of the central nervous system who were screened. All four MLC1 IgG-positive patients exhibited overlapping yet atypical clinical features of MS and NMOSD and tested negative for AQP4 and MOG antibodies. Moreover, treatment with a monoclonal MLC1 antibody induced astrocytopathy in mouse cerebellar slice cultures and in a rat encephalitis model. Thus, MLC1 antibodies identify a subset of patients with an NMOSD-like phenotype, underscoring their potential as a disease marker with pathogenic relevance.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
Myelin Oligodendrocyte Glycoprotein ; Neuromyelitis Optica ; Autoantibody ; Multiple Sclerosis ; Antibody ; Epitope ; Oligodendrocyte ; Monoclonal Antibody ; Demyelinating Disease; Myelin-oligodendrocyte Glycoprotein; Multiple-sclerosis; Megalencephalic Leukoencephalopathy; Neuromyelitis-optica; Subcortical Cysts; Autoantibodies; Mog; Spectrum; Brain; Cells
ISSN (print) / ISBN
1946-6234
e-ISSN
1946-6242
Journal
Science Translational Medicine
Quellenangaben
Volume: 18,
Issue: 864,
Article Number: eady0403
Publisher
American Association for the Advancement of Science (AAAS)
Publishing Place
1200 New York Ave, Nw, Washington, Dc 20005 Usa
Reviewing status
Peer reviewed
Institute(s)
Core Facility Monoclonal Antibodies (CF-MAB)
Grants
NINDS
Else Kroener Fresenius Stiftung
Schering Stiftung and the Fritz Thyssen Foundation
DFG
Verein "Therapieforschung fur MS-Kranke e.V."
Austrian Science Fund (FWF)
Guthy-Jackson Charitable Foundation
Else Kroener Fresenius Stiftung
Schering Stiftung and the Fritz Thyssen Foundation
DFG
Verein "Therapieforschung fur MS-Kranke e.V."
Austrian Science Fund (FWF)
Guthy-Jackson Charitable Foundation