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Area of Science:

  • Immunology
  • Autoimmune Diseases
  • Neuroimmunology

Background:

  • Myasthenia gravis (MG) is an autoimmune disorder often caused by autoantibodies against acetylcholine receptors (AChR).
  • Early-onset AChR-antibody-positive MG (EOMG) frequently presents with thymic follicular hyperplasia, but its underlying mechanisms are unclear.

Purpose of the Study:

  • To investigate the cellular and molecular drivers of thymic hyperplasia in EOMG.
  • To identify potential therapeutic targets for EOMG.

Main Methods:

  • Single-cell transcriptional profiling of thymic lymphoid cells from 11 immunotherapy-naïve EOMG patients.
  • Multiplex histology and ELISA to assess migration inhibitory factor (MIF) levels.

Main Results:

  • Identified distinct B-cell populations in EOMG thymi with significant germinal center activity and clonal expansion.
  • Predicted strong T-cell interactions with B-cells, mediated by the MIF-CD74 axis, promoting B-cell survival.
  • Correlated circulating MIF levels with EOMG disease severity.

Conclusions:

  • EOMG thymi contain hyperplastic niches that support pathogenic B-cell proliferation and maturation.
  • The MIF-CD74 axis is a potential therapeutic target for EOMG.