4.6 Article

Cutting Edge: Intracellular IFN-β and Distinct Type I IFN Expression Patterns in Circulating Systemic Lupus Erythematosus B Cells

Journal

JOURNAL OF IMMUNOLOGY
Volume 201, Issue 8, Pages 2203-2208

Publisher

AMER ASSOC IMMUNOLOGISTS
DOI: 10.4049/jimmunol.1800791

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Funding

  1. National Institutes of Health (NIH) [R01-AI071110, R01 AI134023]
  2. U.S. Department of Veterans Affairs/Biomedical Laboratory Research and Development Grants [I01 BX004049, I01 BX000600]
  3. Lupus Research Alliance (LRA) Distinguished Innovator Award
  4. NIH [R01-AI-083705, 5R37AI049660, P30-AR-048311, P30-AI-027767]
  5. LRA Novel Research Award
  6. NIH Immunology T32 Training Grant [2T32AI007051-39]
  7. Lupus Foundation of America Gina M. Finzi Memorial Student Summer Fellowship
  8. Autoimmunity Center of Excellence - Emory University [U19 AI110483]

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In systemic lupus erythematosus (SLE), type I IFNs promote induction of type I IFN-stimulated genes (ISG) and can drive B cells to produce autoantibodies. Little is known about the expression of distinct type I IFNs in lupus, particularly high-affinity IFN-beta. Single-cell analyses of transitional B cells isolated from SLE patients revealed distinct B cell subpopulations, including type I IFN producers, IFN responders, and mixed IFN producer/responder clusters. Anti-Ig plus TLR3 stimulation of SLE B cells induced release of bioactive type I IFNs that could stimulate HEK-Blue cells. Increased levels of IFN-beta were detected in circulating B cells from SLE patients compared with controls and were significantly higher in African American patients with renal disease and in patients with autoantibodies. Together, the results identify type I IFN-producing and- responding subpopulations within the SLE B cell compartment and suggest that some patients may benefit from specific targeting of IFN-beta.

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