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The effect of IgA and IgG soluble immune complexes (SIC) on neutrophil chemotaxis was investigated. Six types of SIC were prepared from kappa-type IgA and IgG myeloma proteins: IgA-anti-kappa chain antibody SIC in IgA excess, IgA-anti-kappa chain antibody in SIC in anti-kappa chain antibody excess, IgA-anti-alpha chain antibody SIC in IgA excess, IgG-anti-kappa chain antibody SIC in IgG excess, IgG-anti-kappa chain antibody SIC in anti-kappa chain antibody excess, and IgG-anti-gamma chain antibody SIC in IgG excess. Three types of IgA SIC had a marked suppressive effect on neutrophil chemotaxis, while IgG SIC, free IgA, free anti-kappa chain antibody, and free anti-gamma chain antibody showed no inhibitory activity. This suppressive effect on neutrophil chemotaxis caused specifically by polymerized IgA was a cell-directed one and was expressed in a concentration dependent manner.
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