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Related Experiment Videos

Rheumatoid factor diversity.

W J Koopman1, R E Schrohenloher

  • 1Department of Medicine, University of Alabama, Birmingham 35294.

In Vivo (Athens, Greece)
|January 1, 1988
PubMed
Summary

Rheumatoid factors (RFs) show significant diversity in their structure and expression. Investigating IgA RF forms in rheumatoid arthritis reveals potential roles in disease pathogenesis.

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Area of Science:

  • Immunology
  • Rheumatology
  • Molecular Biology

Background:

  • Rheumatoid factors (RFs) are autoantibodies targeting IgG, displaying extensive isotypic and idiotypic variation.
  • Differential expression of IgM and IgA RFs implies specific regulatory mechanisms in humans.

Purpose of the Study:

  • To investigate the physical characteristics of IgA RF in rheumatoid arthritis (RA).
  • To explore the pathogenetic significance of monomeric versus polymeric IgA RF in RA.
  • To analyze the idiotypic diversity of RFs.

Main Methods:

  • Analysis of IgA RF forms (monomeric and polymeric) in sera and synovial fluids of RA patients.
  • Investigation of IgG-IgA complexes' effect on lysosomal release.
  • Characterization of RF idiotypes using monoclonal antibodies (e.g., 6B6.6).

Main Results:

  • Polymeric IgA RF generally predominates in RA patients, but monomeric/polymeric ratios vary.
  • Both monomeric and polymeric IgA RF are produced by synovial plasma cells.
  • Polymeric IgA-IgG complexes potently induce lysosomal release, unlike monomeric forms.
  • A specific idiotype (recognized by 6B6.6) is found on a subset of IgM RFs.

Conclusions:

  • The diversity of RFs is extensive, with implications for various conditions.
  • Isotype-specific regulation and IgA RF forms may play roles in RA pathogenesis.
  • Molecular genetic studies are crucial for understanding RF diversity and relationships in health and disease.

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