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Review article| Volume 53, 103057, August 2021

Can rheumatologists stop causing demyelinating disease?

  • David Baker
    Correspondence
    Corresponding author.
    Affiliations
    Barts and The London School of Medicine and Dentistry, Blizard Institute, Queen Mary University of London, E1 2AT, United Kingdom
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  • Charalambos Hadjicharalambous
    Affiliations
    Barts and The London School of Medicine and Dentistry, Blizard Institute, Queen Mary University of London, E1 2AT, United Kingdom
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  • Sharmilee Gnanapavan
    Affiliations
    Barts and The London School of Medicine and Dentistry, Blizard Institute, Queen Mary University of London, E1 2AT, United Kingdom

    Clinical Board:Medicine (Neuroscience), The Royal London Hospital, Barts Health NHS Trust, London, United Kingdom
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  • Gavin Giovannoni
    Affiliations
    Barts and The London School of Medicine and Dentistry, Blizard Institute, Queen Mary University of London, E1 2AT, United Kingdom

    Clinical Board:Medicine (Neuroscience), The Royal London Hospital, Barts Health NHS Trust, London, United Kingdom
    Search for articles by this author

      Highlights

      • Tumour necrosis factor inhibitors and other rheumatoid arthritis treatments can infrequently induce demyelination disease.
      • Disease modifying anti-rheumatoid drugs may increase pathogenic memory B cell responses and inhibit potentially pathogenic ectopic B cell follicles.
      • Poor central nervous penetration of disease modifying anti-rheumatoid drugs may not limit brain located ectopic B cell follicles, whilst inhibiting joint disease

      Abstract

      Background

      Perhaps the most informative experiments in human disease are clinical trials and notably, responses to specific therapies can be highly-informative to help understand disease pathogenesis. There are reagents that inhibit a variety of different autoimmune conditions, such as CD20 memory B cell depleters that are active in both multiple sclerosis (MS), rheumatoid arthritis (RA) and other conditions, suggesting influences on common immune mechanisms in different diseases. However, a notable exception seemed to be the use of tumour necrosis factor (TNF) inhibitors that limits RA, yet seem to, rarely, trigger demyelination and induce MS. This was first seen with TNF-inhibiting monoclonal antibodies and TNF-receptor-immunoglobulin fusion proteins. However, this is also seen with tyrosine and Janus kinase inhibitors that inhibit RA, yet induce demyelinating disease in some individuals

      Purpose

      To provide an overview, from a B cell centric perspective, that may underpin the biology that links arthritis treatments to the development of demyelinating disease.

      Conclusions

      It is apparent that the disease modifying anti-rheumatoid drugs that cause demyelination share a number of common features. These agents tend to inhibit TNF-receptor signalling, augment or exhibit limited inhibitor activity on class-switched memory B cells and importantly appear to be relatively excluded from the central nervous system (CNS). They will thus not target ectopic B cell follicles in the CNS, unlike that occurring in peripheral autoimmunity as seen with anti-TNF treatments in RA. Agents such as ibudilast and some Janus kinase inhibitors that inhibit TNF and clearly penetrate the CNS do not appear to induce demyelination and may even be neuroprotective. It remains to be established whether selection or development of CNS penetrant agents may avoid CNS-complications of treatments for RA. Clearly, further studies are warranted

      Graphical abstract

      Keywords

      Abbreviations:

      CNS (central nervous system (CNS)), CSF (cerebrospinal fluid), DMARDS (disease modifying anti-rheumatoid drugs), MS (multiple sclerosis, rheumatoid, arthritis, TNF, tumour necrosis factor)
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