Abstract
Heat aggregated IgG and soluble immune complexes (IC) prepared by combining human serum albumin with rabbit anti-serum albumin and tetanus toxoid with rabbit antiserum to tetanus toxoid were shown to bind to human O+ RBC. The binding was greater for soluble IC prepared at antigen excess, and although it was usually maximal when IC were pre-opsonized, it could also be demonstrated using non-opsonized heat aggregated IgG or soluble IC prepared in the absence of complement. These observations suggest that two types of receptors may be involved in binding of soluble IC to human RBC: the classical C3b receptor, and a non-complement-dependent receptor, perhaps recognizing the Fc region of the immunoglobulin molecule exposed after heat aggregation or antigen-antibody reaction.
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Selected References
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