Abstract
Aggregated trypanosome masses that had formed in the region of equivalence in the absence of complement were readily dissociated by complement. Complement-mediated dissociation of the clumped trypanosomes in the area of equivalence released approximately 50% of the previously bound surface antigens. These antigens were capable of rebinding to new IgG antibody. Experiments indicated that complement deposition altered the bivalent IgG antibody in the immune complex into a univalent form. The occurrence of such an event in the presence of complement provides a great advantage to the infected host in the killing of pathogens in vivo, as it enables a greater number of antibodies to attach to surface antigens and subsequently initiate complement activity.
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Takayanagi, T., Kawaguchi, H., Yabu, Y. et al. Dissociation of IgG antibody-mediated clumps ofTrypanosoma brucei gambiense by complement. Parasitol Res 77, 645–650 (1991). https://doi.org/10.1007/BF00928677
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DOI: https://doi.org/10.1007/BF00928677