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The Journal of Immunology, Vol 154, Issue 9 4526-4535, Copyright © 1995 by American Association of Immunologists

ARTICLES

Heavy chain variable region, light chain variable region, and heavy chain CDR3 influences on the mono- and polyreactivity and on the affinity of human monoclonal rheumatoid factors

R Crouzier, T Martin and JL Pasquali
Laboratory of Immunopathology, University Hospitals of Strasbourg, France.

Monoreactive high affinity pathologic autoantibodies were supposed previously to derive through somatic mutation from polyreactive low affinity autoantibodies that are encoded by a small set of unmutated V region genes in fetal and neonatal B cells. However, recent data exploring the physiologically expressed Ab repertoire and the importance of the stochastically generated heavy chain CDR3 (H-CDR3) in autoreactivity suggest that this scheme is incomplete. Here we analyzed via gene-swapping experiments and site-directed mutagenesis the relative contributions of the mutations in the light chain variable region (VL) and the heavy chain variable region (VH) domains and of the H-CDR3 in the autoreactivity of two IgM rheumatoid factors (RF), one a polyreactive low affinity Ab, the other a monoreactive high affinity Ab. These two RFs derived from the same V kappa III (humkv325) and VH1 (51p1) genes, but differed from each other by a few mutations and by the structure of the H-CDR3. The analysis of the reactivity patterns of different combinations of wild-type and in vitro engineered hybrid gene products clearly demonstrates the main influence of the H-CDR3 in the autoAb activity profiles. The results directly demonstrate the previously proposed hypothesis, namely, that the H-CDR3 plays a critical role in distinguishing poly- from monospecific RF. However, the data also indicate that self polyreactivity is a very fragile property and is dependent upon the primary structure of the VH segment.


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