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Effect of cell:cell competition and BAFF expression on peripheral B cell tolerance and B-1 cell survival in transgenic mice expressing a low level of IgK-reactive macroself antigen

Academic Article
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Overview

related to degree

  • Duong, Bao Hoa, Ph.D. in Macromolecular and Cellular Structure and Chemistry, Scripps Research 2003 - 2009

authors

  • Ait-Azzouzene, D.
  • Gavin, Amanda
  • Skog, P.
  • Duong, Bao Hoa
  • Nemazee, David

publication date

  • April 2006

journal

  • European Journal of Immunology  Journal

abstract

  • In mice carrying a synthetic Igkappa-reactive superantigen ("kappa macroself antigen"), low level expression induced split peripheral B cell tolerance in the sIgkappa+ compartment, with striking reductions in follicular and marginal zone (MZ) B cells and the retention of significant numbers of sIgkappa+ B-1a but not B-1b cells in the peritoneum. Here, we characterize the transgenic line pKkappa with this split tolerance phenotype and assess the effects of B cell competition and the survival cytokine BAFF (B cell activating factor belonging to the TNF family) on peripheral tolerance. In pKkappa mice the surviving peritoneal and splenic kappa+ B cells were largely lost in mice carrying one copy of the human Ckappa exon in place of the mouse version, a maneuver that generates additional antigen non-reactive competitor B cells in this model. Furthermore, overexpression of BAFF suppressed kappa-macroself antigen-induced deletion and promoted production of both IgM,kappa and IgA,kappa antibodies in mice with normal Igkappa alleles but not in mice carrying one copy of the human Ckappa allele. These findings suggest that BAFF overexpression has minimal effects on the survival of autoreactive B cells in a polyclonal immune system and that B cell:B cell competition plays a potent role in suppressing the survival of B-1 and splenic B cells with excessive autoreactivity.

subject areas

  • Animals
  • Autoantigens
  • B-Cell Activating Factor
  • B-Lymphocytes
  • Cell Communication
  • Cell Survival
  • Flow Cytometry
  • Humans
  • Immune Tolerance
  • Immunoglobulin kappa-Chains
  • Membrane Proteins
  • Mice
  • Mice, Transgenic
  • Polymerase Chain Reaction
  • Tumor Necrosis Factor-alpha
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Research

keywords

  • B cell
  • TNFSF13b
  • anergy
  • superantigen
  • tolerance
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Identity

International Standard Serial Number (ISSN)

  • 0014-2980

Digital Object Identifier (DOI)

  • 10.1002/eji.2005355811

PubMed ID

  • 16511898
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Additional Document Info

start page

  • 985

end page

  • 996

volume

  • 36

issue

  • 4

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