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B de la Fuente and LW Hoyer
We have prepared an antiidiotype antibody that specifically reacts with and
inactivates a human autoantibody to factor VIII (VIII:C). The antiidiotype
specificity of this rabbit antibody was evident in solution, as specific
inhibition of anti-VIII:C activity, and in solid- phase studies. The
antiidiotype antibody inhibited both plasma anti- VIII:C and Fab' fragments
prepared from that plasma's IgG. Although the antibody had a greater
inhibitory effect on the anti-VIII:C used for immunization than it did for
other anti-VIII:C, partial inhibition was identified with ten of 25 other
human anti-VIII:C. The demonstration that antiidiotype antibodies can be
prepared to human anti-VIII:C indicates the feasibility of this approach to
the immunochemical characterization of human anti-VIII:C inhibitors.
Moreover, antiidiotype reagents have a potential role in the treatment of
inhibitor patients.
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