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Scientific article
Open access
English

Molecular and cellular basis for pathogenicity of autoantibodies: lessons from murine monoclonal autoantibodies

Published inSpringer seminars in immunopathology, vol. 28, no. 2, p. 175-184
Collection
  • Open Access - Licence nationale Springer
Publication date2006
Abstract

The pathogenesis of autoantibody-mediated cellular and tissue lesions in autoimmune diseases is most straightforwardly attributable to the combined action of self-antigen binding properties and effector functions associated with the Fc regions of the different immunoglobulin (Ig) isotypes. The analysis of two different sets of monoclonal autoantibodies derived from lupus-prone mice revealed remarkable differences in the pathogenic potentials of different IgG subclasses: (1) the IgG2a and IgG2b subclasses of anti-red blood cell (RBC) autoantibodies are the most pathogenic and efficiently activate two classes of activating IgG Fc receptors (FcgammaRIII and FcgammaRIV) and complement; (2) the IgG3 subclass is less pathogenic and activate only complement; and (3) the IgG1 subclass is the least pathogenic and interact only with FcgammaRIII. In addition, because of the unique property of IgG3 to form self-associating complexes and generate cryoglobulins, this subclass of rheumatoid factor and anti-DNA autoantibodies became highly pathogenic and induced lupus-like nephritis and/or vasculitis. Since the switch to IgG2a and IgG3 is promoted by Th1 cytokine interferon gamma, these results strongly suggest that Th1 autoimmune responses could be critically involved in the generation of more pathogenic autoantibodies in systemic lupus erythematosus. This finding is consistent with the observation that the progression of murine lupus nephritis is correlated with the relative dominance of Th1 autoimmune responses. Finally, the analysis of IgG glycosylation pattern revealed that more sialylated IgG autoantibodies remained poorly pathogenic because of limited Fc-associated effector functions and loss of cryoglobulin activity. This suggests that the terminal sialylation of the oligosaccharide side chains of IgG could be a significant factor determining the pathogenic potential of autoantibodies. Our results thus underline the importance of subpopulations of autoantibodies, induced by the help of Th1 cells, in the pathogenesis of autoantibody-mediated cellular and tissue injuries.

Keywords
  • Animals
  • Antibodies, Antinuclear/genetics/*immunology
  • Antibodies, Monoclonal/genetics/*immunology
  • Autoantigens/genetics/immunology
  • Humans
  • Immunoglobulin G/genetics/*immunology
  • Interferon-gamma/genetics/immunology
  • Lupus Nephritis/genetics/*immunology/pathology
  • Mice
  • Th1 Cells/immunology/pathology
  • Vasculitis/genetics/immunology/pathology
Affiliation Not a UNIGE publication
Citation (ISO format)
BAUDINO, Lucie Clementine et al. Molecular and cellular basis for pathogenicity of autoantibodies: lessons from murine monoclonal autoantibodies. In: Springer seminars in immunopathology, 2006, vol. 28, n° 2, p. 175–184. doi: 10.1007/s00281-006-0037-0
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Article (Published version)
accessLevelPublic
Identifiers
ISSN of the journal0344-4325
495views
255downloads

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