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Mucosal-Associated Invariant T Cells in Rheumatic Diseases.

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Mucosal-associated invariant T (MAIT) cells, crucial for immunity, are reduced in rheumatic diseases but accumulate in inflamed tissues. These findings highlight MAIT cells

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Area of Science:

  • Immunology
  • Rheumatology
  • Cell Biology

Background:

  • Mucosal-associated invariant T (MAIT) cells are innate-like T cells recognizing microbial metabolites via MR1.
  • MAIT cells rapidly produce pro-inflammatory and cytotoxic mediators upon activation.
  • Their interaction with microbiota and tissue accumulation implicate them in inflammatory conditions.

Purpose of the Study:

  • To review recent findings on MAIT cells in major rheumatic diseases.
  • To explore the role of MAIT cells in the pathogenesis of inflammatory rheumatologic conditions.

Main Methods:

  • Literature review of studies on MAIT cells in rheumatoid arthritis, spondyloarthritis, psoriatic arthritis, systemic lupus erythematosus, systemic sclerosis, primary Sjögren syndrome, and dermatomyositis.
  • Analysis of MAIT cell frequency, phenotype, and tissue distribution in these diseases.
  • Examination of evidence from mouse models.

Main Results:

  • Circulating MAIT cell frequency is decreased in most studied rheumatic diseases.
  • Residual MAIT cells often display an activated phenotype with enhanced cytokine production.
  • MAIT cells are enriched in inflamed tissues in conditions like rheumatoid arthritis and Sjögren syndrome.
  • MAIT cells contribute to disease progression in relevant mouse models.

Conclusions:

  • MAIT cells are involved in the immunopathogenesis of inflammatory rheumatologic diseases.
  • MAIT cells may migrate to inflamed tissues, contributing to local inflammation.
  • MAIT cells represent a potential therapeutic target for rheumatic diseases.