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Clinical and laboratory features of anti-MAG neuropathy without monoclonal gammopathy

Lookup NU author(s): Professor Jordi Diaz ManeraORCiD

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Abstract

© 2019, The Author(s). Antibodies against myelin-associated glycoprotein (MAG) almost invariably appear in the context of an IgM monoclonal gammopathy associated neuropathy. Very few cases of anti-MAG neuropathy lacking IgM-monoclonal gammopathy have been reported. We investigated the presence of anti-MAG antibodies in 69 patients fulfilling diagnostic criteria for CIDP. Anti-MAG antibodies were tested by ELISA and confirmed by immunohistochemistry. We identified four (5.8%) anti-MAG positive patients without detectable IgM-monoclonal gammopathy. In two of them, IgM-monoclonal gammopathy was detected at 3 and 4-year follow-up coinciding with an increase in anti-MAG antibodies titers. In conclusion, anti-MAG antibody testing should be considered in chronic demyelinating neuropathies, even if IgM-monoclonal gammopathy is not detectable.

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Author(s): Pascual-Goni E, Martin-Aguilar L, Lleixa C, Martinez-Martinez L, Simon-Talero MJ, Diaz-Manera J, Cortes-Vicente E, Rojas-Garcia R, Moga E, Juarez C, Illa I, Querol L

Publication type: Article

Publication status: Published

Journal: Scientific Reports

Year: 2019

Volume: 9

Issue: 1

Online publication date: 16/04/2019

Acceptance date: 02/04/2019

Date deposited: 27/02/2020

ISSN (electronic): 2045-2322

Publisher: Nature Publishing Group

URL: https://doi.org/10.1038/s41598-019-42545-8

DOI: 10.1038/s41598-019-42545-8

PubMed id: 30992531

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