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The Journal of Immunology, Vol 133, Issue 1 190-194, Copyright © 1984 by American Association of Immunologists

ARTICLES

A human monoclonal IgG1 with anti-idiotypic activity against anti-human thyroglobulin autoantibody

M Zouali, JM Fine and A Eyquem

Sixty-one human myeloma proteins (HMP) from patients with multiple myeloma and Waldenstrom macroglobulinemia were tested for anti- idiotypic (Id) activity against autoantibodies to double-stranded DNA, small nuclear ribonucleoproteins, and human thyroglobulin (HTg), by competitive radioimmunoassays and enzyme immunoassays. An IgG1, lambda HMP from patient BEN with anti-Id activity against antibodies to HTg is reported. IgG1 BEN was not directed toward human Fc fragments and its activity was not related to allotypic determinants. IgG1 BEN molecules recognized Id determinants (idiotopes) on F(ab')2 anti-HTg fragments, but not idiotopes of F(ab')2 fragments of antibodies of other specificities. This observation supports the general significance of Id network interactions in regulation and diversification of immune responses in man.




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