Relative inhibitory activities of the eluted fractions on the contractile responses to SP (10 nM) and acetylcholine (ACh, 100 nM) of the guinea pig ileum are shown by black bars.
Naturally occurring anti-IgE autoantibodies represent a heterogeneous mixture of antibodies with diverse specificities and biological functions. By using murine monoclonal anti-IgE autoantibodies directed against different epitopes on the IgE molecule as a model for autoantibodies, we could show that only a minority of antibodies combine all beneficial biological activities, such as the activity of inhibiting in vitro IgE synthesis, removing IgE from the surface of CD23+ cells and not being anaphylactogenic. While it is difficult to isolate and measure anti-IgE antibodies in human serum, it is now possible to generate such human anti-IgE antibodies by the method of repertoire cloning. Thus, human recombinant antibodies against IgE may become available for the treatment of atopic disease.
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