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Identification of the flotillin-1/2 heterocomplex as a target of autoantibodies in bona fide multiple sclerosis

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Item Type:Article
Title:Identification of the flotillin-1/2 heterocomplex as a target of autoantibodies in bona fide multiple sclerosis
Creators Name:Hahn, S. and Trendelenburg, G. and Scharf, M. and Denno, Y. and Brakopp, S. and Teegen, B. and Probst, C. and Wandinger, K.P. and Buttmann, M. and Haarmann, A. and Szabados, F. and Vom Dahl, M. and Kuempfel, T. and Eichhorn, P. and Gold, H. and Paul, F. and Jarius, S. and Melzer, N. and Stöcker, W. and Komorowski, L.
Abstract:BACKGROUND: Autoantibodies, in particular those against aquaporin-4 and myelin-oligodendrocyte glycoprotein (MOG), aid as biomarkers in the differential diagnosis of demyelination. Here, we report on discovery of autoantibodies against flotillin in patients with multiple sclerosis (MS). METHODS: The target antigen was identified by histo-immunoprecipitation using the patients' sera and cryosections of rat or pig cerebellum combined with mass spectrometrical analysis. Correct identification was ascertained by indirect immunofluorescence and neutralization tests using the target antigens recombinantly expressed in HEK293 cells. RESULTS: Serum and CSF of the index patient produced a fine-granular IgG indirect immunofluorescence staining of the hippocampal and cerebellar molecular layers. Flotillin-1 and flotillin-2 were identified as target autoantigens. They also reacted with recombinant human flotillin-1/2 co-expressed in HEK293 cells, but not with the individual flotillins in fixed- and live-cell assays. Moreover, neutralization using flotillin-1/2, but not the single flotillins, abolished the tissue reactivity of patient serum. Screening of 521 patients, for whom anti-aquaporin-4 testing was requested and negative, revealed 8 additional patients with anti-flotillin-1/2 autoantibodies. All eight were negative for anti-MOG. Six patients ex post fulfilled the revised McDonald criteria for MS. Vice versa, screening of 538 MS sera revealed anti-flotillin-1/2 autoantibodies in eight patients. The autoantibodies were not found in a cohort of 67 patients with other neural autoantibody-associated syndromes and in 444 healthy blood donors. CONCLUSIONS: Autoantibodies against the flotillin-1/2 heterocomplex, a peripheral membrane protein that is involved in axon outgrowth and regeneration of the optic nerve, are present in 1-2% of patients with bona fide MS.
Keywords:Autoantibodies, Flotilin, Reggie, Histo-Immunoprecipitation, Multiple Sclerosis, Optic Neuritis, Animals, Rats, Swine
Source:Journal of Neuroinflammation
Publisher:BioMed Central
Page Range:123
Date:23 June 2017
Official Publication:https://doi.org/10.1186/s12974-017-0900-z
PubMed:View item in PubMed

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