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. 1987 Mar;79(3):813–818. doi: 10.1172/JCI112888

Monomeric (7S) IgM found in the serum of rheumatoid arthritis patients share idiotypes with pentameric (19S) monoclonal rheumatoid factors.

V R Bonagura, L Mendez, N Agostino, B Pernis
PMCID: PMC424206  PMID: 3818949

Abstract

Serum from some seropositive (RF+) rheumatoid arthritis (RA) patients contains relatively high concentrations of monomeric (7S) IgM molecules. Seven S IgM molecules fail to bind the Fc portion of IgG, unlike 19S IgM RFs that bind aggregated IgG in classical RF assays. Some pentameric IgM RFs are marked by crossreactive idiotypes (RCRI) defined by prototypic monoclonal RFs. In previous studies, we observed that a proportion of pokeweed mitogen (PWM) induced plasma cells from RA patients' blood lymphocytes express the major RCRI as assayed by indirect immunofluorescence with polyclonal anti-RCRI antibodies. In this study, 7S IgM obtained from three different RF+ RA patients inhibits specific anti-RCRI intracytoplasmic staining of PWM induced RF+ RA-derived plasma cells. These 7S molecules also block polyclonal anti-RCRI antibodies from reacting with red blood cells bearing 7S IgM molecules from RF+ patients with RA or Waldenstrom's macroglobulinemia. We conclude that some 7S IgM molecules in the serum of RF+ RA patients are marked by the major RCRI idiotype and are related to 19S monoclonal and polyclonal RFs.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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