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Interaction between soluble immune complexes and glass-fiber filters

The two components of soluble antigen--antibody complexes, at the antigen excess, exhibit an increase in their binding ability to glass-fiber filters. This is demonstrated in two systems. In the 125I-BSA--anti-BSA system the proportion of 125I-BSA bound to the filter is markedly increased in the presence of anti-BSA antibodies. More than 80% of the antibody bound BSA can be removed by passage through the filter. In the other system, mouse gamma globulin (MGG)--125I-anti-MGG, the proportion of antibody bound to the filter increases with the increase in antigen concentration, whilst the presence of another, non-related, gamma globulin has little effect on the binding. The possible mechanisms for the binding of soluble complexes to the glass fibers are suggested and discussed.

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