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The bm12 Inducible Model of Systemic Lupus Erythematosus (SLE) in C57BL/6 Mice
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Similarities and differences between selective and nonselective BAFF blockade in murine SLE.

Meera Ramanujam1, Xiaobo Wang, Weiqing Huang

  • 1Department of Medicine, Columbia University, New York, New York, USA.

The Journal of Clinical Investigation
|February 18, 2006
PubMed
Summary

Blocking both BAFF and APRIL, but not BAFF alone, reduced IgM antibodies and plasma cells in a lupus model. This highlights key differences in therapeutic strategies for autoimmune diseases.

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Area of Science:

  • Immunology
  • Autoimmunity
  • Therapeutic Development

Background:

  • B cells play crucial roles in immune activation and inflammation beyond antibody production.
  • B cell depletion is a promising therapeutic strategy for autoimmune diseases.
  • B cell-activating factor (BAFF) and A proliferation-inducing ligand (APRIL) are key regulators of B cell survival and differentiation.

Purpose of the Study:

  • To compare the therapeutic effects of blocking BAFF alone versus blocking both BAFF and APRIL in a murine model of systemic lupus erythematosus (SLE).

Main Methods:

  • Comparison of BAFF receptor-Ig (blocks BAFF) and transmembrane activator and calcium modulator ligand interactor-Ig (blocks BAFF and APRIL) in NZB/W F1 mice.
  • Assessment of survival, B cell populations, T cell activation, dendritic cell accumulation, and antibody responses (IgG anti-dsDNA, IgM).

Main Results:

  • Both BAFF blockade and BAFF/APRIL blockade prolonged survival and reduced B cell populations and T cell activation.
  • Neither reagent significantly affected the IgG anti-double-stranded DNA response.
  • Blockade of both BAFF and APRIL, unlike BAFF blockade alone, reduced IgM antibody levels, splenic plasma cells, and T cell-dependent IgM responses.

Conclusions:

  • Blocking both BAFF and APRIL offers distinct advantages over BAFF blockade alone, particularly in reducing IgM production and plasma cell frequency.
  • These findings have implications for selecting targeted therapies for autoimmune and malignant diseases.