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Related Experiment Video

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Human effector B lymphocytes express ARID3a and secrete interferon alpha.

Julie M Ward1, Michelle L Ratliff1, Mikhail G Dozmorov2

  • 1Department of Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA.

Journal of Autoimmunity
|August 15, 2016
PubMed
Summary

Researchers found that the transcription factor ARID3a in B lymphocytes is linked to interferon alpha (IFNa) production and lupus disease activity. This discovery identifies a new type of effector B cell involved in inflammatory responses in systemic lupus erythematosus (SLE).

Keywords:
ARID3aEffector B lymphocyteInflammationInterferon alphaLupus

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Area of Science:

  • Immunology
  • Molecular Biology
  • Rheumatology

Background:

  • Increased disease activity in systemic lupus erythematosus (SLE) correlates with higher numbers of B lymphocytes expressing the transcription factor ARID3a.
  • The precise role of ARID3a in SLE pathogenesis, particularly its relationship with Type I interferon responses, remains incompletely understood.

Purpose of the Study:

  • To investigate the role of ARID3a in interferon alpha (IFNa) production and its association with lupus-associated gene signatures.
  • To identify ARID3a-expressing B cells as potential effector cells in SLE pathogenesis.

Main Methods:

  • Analysis of ARID3a expression in SLE patients and correlation with disease activity.
  • Assessment of IFNa production and interferon signature gene transcription in relation to ARID3a.
  • In vitro stimulation of healthy control B cells with CpG (TLR 9 agonist) to induce ARID3a and IFNa.
  • Evaluation of IFNa secretion from stimulated B cells and its effect on plasmacytoid dendritic cells.

Main Results:

  • ARID3a expression is strongly associated with the transcription of lupus IFN signature genes.
  • Both ARID3a expression and IFNa production can be induced in healthy B cells by CpG stimulation.
  • Secreted IFNa from ARID3a-expressing B cells enhances IFNa production in plasmacytoid dendritic cells.

Conclusions:

  • ARID3a plays a critical role in IFNa expression and is linked to IFN-associated inflammatory responses in SLE.
  • ARID3a-positive B lymphocytes represent a novel class of effector B cells contributing to SLE pathogenesis.
  • These findings highlight ARID3a as a potential therapeutic target in SLE.