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  • Title: Interactions of the third component of complement (C3) with cross-linked dextran. III. Isolation and characterization of interacting components after enzymatic digestion of complement coated cross-linked dextran.
    Author: Knapp W.
    Journal: Z Immunitatsforsch Exp Klin Immunol; 1975 Jul; 149(5):389-96. PubMed ID: 126570.
    Abstract:
    In previous investigations we could show that incubation of cross-linked dextran (Sephadex) with normal human and normal guinea pig serum results in the binding of C3 to Sephadex. This binding was found to be due to activation of C3 via an alternate pathway. In this paper data are presented which show that components bound to Sephadex can be recovered after enzymatic digestion of serum-reacted Sephadex beads. The digests were characterized with immuno-electrophoresis and double immunodiffusion techniques. It could be shown that the main component present in the digest was converted C3. Apart from C3 under our test conditions only minute amounts of C3A but no other serum proteins were detectable. The observation that almost exclusively C3 is bound to Sephadex is further supported by the finding that immunization of rabbits with serum-reacted Sephadex beads results in the exclusive formation of anti C3 antibodies. Implications from these findings and possible applications are discussed.
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