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Lessons from BXSB and related mouse models.

S Izui1, N Ibnou-Zekri, L Fossati-Jimack

  • 1Department of Pathology, Centre Medical Universitaire, University of Geneva, Switzerland.

International Reviews of Immunology
|October 4, 2000
PubMed
Summary

A Y-chromosome gene, Yaa, accelerates systemic lupus erythematosus (SLE) in male mice by enhancing autoimmune responses and promoting Th1 activity. This defect is expressed in B cells, not T cells, lowering stimulation thresholds.

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Area of Science:

  • Immunology
  • Genetics
  • Autoimmune Diseases

Background:

  • BXSB mice spontaneously develop a lupus-like autoimmune syndrome.
  • This syndrome affects males earlier than females due to a Y-linked gene, Yaa.
  • Yaa accelerates lupus development, especially with autosomal susceptibility alleles.

Purpose of the Study:

  • To investigate the role of the Yaa gene in accelerating systemic lupus erythematosus (SLE).
  • To understand the cellular basis and mechanisms by which Yaa influences autoimmune responses.

Main Methods:

  • Analysis of BXSB murine strain with Yaa gene.
  • Bone marrow chimera experiments (Yaa+ vs. Yaa-).
  • Assessment of immune responses, autoantibody production, and cellular defects.

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Main Results:

  • Yaa enhances autoimmune responses and promotes pathogenic Th1-driven autoantibody production (IgG2a, IgG3).
  • The Yaa defect is cell-autonomous in B cells, not T cells.
  • T cells can help autoimmune responses mediated by Yaa+ B cells.

Conclusions:

  • Yaa significantly accelerates SLE by lowering the activation threshold for autoreactive B cells.
  • The Yaa gene's primary defect lies within B cells, impacting their susceptibility to stimulation.
  • Understanding Yaa's mechanism offers insights into SLE pathogenesis and potential therapeutic targets.