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Related Experiment Videos

Identification and characterization of circulating human transitional B cells.

Gary P Sims1, Rachel Ettinger, Yuko Shirota

  • 1Autoimmunity Branch, National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institute of Health, Bethesda, MD, USA.

Blood
|February 11, 2005
PubMed
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Human B-cell development pathways are explored, identifying circulating transitional B cells (T1) similar to mice but expressing CD5. These cells mature with stromal cell or IL-4 support, with implications for understanding systemic lupus erythematosus (SLE).

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Murine B-cell development occurs in bone marrow, with immature transitional B cells maturing in the spleen.
  • The equivalent human B-cell developmental pathway remains incompletely understood.

Purpose of the Study:

  • To investigate human B-cell development and identify circulating transitional B cells.
  • To characterize the phenotype and survival factors of human transitional B cells.
  • To explore the potential role of transitional B cells in systemic lupus erythematosus (SLE).

Main Methods:

  • Utilized markers of human bone marrow immature B cells to identify circulating B cell populations.
  • Assessed survival of transitional B cells in culture with B-cell activation factor (BAFF), stromal cells, and interleukin-4 (IL-4).
  • Investigated B-cell receptor (BCR) stimulation in the presence of T-cell signals (IL-4, CD40 ligation).

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Main Results:

  • Identified circulating human B cells phenotypically similar to murine transitional type I (T1) B cells, expressing CD5.
  • These T1-like cells exhibited rapid death in culture, unaffected by BAFF but supported by stromal cells or IL-4.
  • BCR stimulation, with T-cell signals, induced cell cycle progression.
  • Circulating B cells resembling murine T2 B cells were found in cord and adult peripheral blood.
  • Elevated proportions of T1 B cells were observed in SLE patients, despite normal bone marrow production and selection.

Conclusions:

  • Human B-cell maturation may occur outside the spleen, with circulating T1 and T2-like B cells identified.
  • Bone marrow stromal cells and IL-4 are crucial for transitional B cell survival.
  • Aberrant T1 B cell proportions in SLE patients warrant further investigation into their role in the disease.