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Related Experiment Videos

CD4 TCRBV CDR3 analysis in prevalent SLE cases from two ethnic groups.

P A Fraser1, L Y Lu, K DeCeulaer

  • 1Center for Blood Research, Harvard Medical School, Department of Medicine, Brigham and Women's Hospital, Boston, MA 02115, USA.

Lupus
|July 21, 1999
PubMed
Summary

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Systemic lupus erythematosus (SLE) patients show significantly higher CD4+ T cell receptor beta variable (TCRBV)-CDR3 expression patterns, suggesting an expanded pool of autoreactive T cells. These patterns, particularly those associated with HLA-DRB3, were stable over time.

Area of Science:

  • Immunology
  • Genetics
  • Rheumatology

Background:

  • Systemic lupus erythematosus (SLE) is a complex autoimmune disease.
  • The role of T cell receptor (TCR) diversity in SLE pathogenesis is not fully understood.

Purpose of the Study:

  • To investigate differences in CD4+ T cell TCRBV-CDR3 expression between SLE patients and healthy controls.
  • To explore associations between TCRBV-CDR3 oligoclonality, HLA-DRB specificities, and pattern duration in SLE.

Main Methods:

  • Analysis of CD4+ T cell TCRBV-CDR3 transcripts from 19 lupus patients and 16 controls.
  • Exploratory analyses of oligoclonality risk and HLA-DRB specificities.
  • Longitudinal assessment of TCRBV-CDR3 expression patterns in four patients.

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Main Results:

  • Oligoclonal TCRBV-CDR3 patterns were three times more frequent in SLE patients (OR=3.7).
  • Specific TCRBV gene segments (BV1, BV4, BV5.1, BV7, BV9, BV18, BV22) showed oligoclonality exclusively in SLE patients.
  • HLA-DRB3 gene positivity was associated with an increased risk of oligoclonal expression in SLE.
  • Observed TCRBV-CDR3 expression patterns remained stable over 6-14 months in longitudinal samples.

Conclusions:

  • Increased and persistent TCRBV-CDR3 oligoclonal expression in SLE suggests an expanded autoreactive CD4+ T cell pool.
  • HLA-DRB3 may play a role in facilitating autoantigen recognition by CD4+ T cells in SLE.