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Longitudinal Immune Cell Profiling in Patients With Early Systemic Lupus Erythematosus.

Takanori Sasaki1, Sabrina Bracero1, Joshua Keegan1

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Summary

Systemic lupus erythematosus (SLE) is characterized by expanded helper T cells and proliferating immune cells in its early stages. These immune cell profiles and associated cytokines evolve over time in early SLE patients.

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Area of Science:

  • Immunology
  • Systemic Lupus Erythematosus (SLE)
  • Rheumatoid Arthritis (RA)

Background:

  • Systemic lupus erythematosus (SLE) is a complex autoimmune disease with diverse immune system dysregulation.
  • Understanding the dynamic immune cell profiles in early SLE is crucial for developing targeted therapies.

Purpose of the Study:

  • To investigate the immune cell profiles in patients with early and established SLE.
  • To identify longitudinal changes in immune cell populations over time.
  • To compare immune cell profiles in SLE with those in rheumatoid arthritis (RA).

Main Methods:

  • Mass cytometry was used to analyze peripheral blood mononuclear cells (PBMCs) from SLE patients and controls.
  • Machine learning and dimensional reduction techniques identified distinct cell populations.
  • Longitudinal analysis tracked immune cell changes over one year in early SLE patients.
  • Serum cytokine levels were measured using Luminex multiplex assay.

Main Results:

  • Expanded populations of peripheral helper T cells, follicular helper T (Tfh) cells, and proliferating immune cells (including CD8 T cells, regulatory T cells, plasmablasts, and monocytes) were observed in early SLE.
  • These alterations were more pronounced in early SLE than in early RA.
  • Longitudinal analysis showed a decrease in Tfh cells and CXCL10 levels after one year.
  • CXCL13 levels correlated positively with expanded cell populations in early SLE.

Conclusions:

  • Early SLE is characterized by the expansion of specific helper T cell and proliferating immune cell subsets.
  • The immunologic landscape of early SLE undergoes significant evolution over time.