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. 1978 Jun;61(6):1570–1581. doi: 10.1172/JCI109077

Isolation of circulating immune complexes using Raji cells. Separation of antigens from immune complexes and production of antiserum.

A N Theofilopoulos, R A Eisenberg, F J Dixon
PMCID: PMC372683  PMID: 659616

Abstract

Raji cells were used for the isolation of complement-fixing antigen-antibody complexes from serum. Immune complexes bound to these cells were radiolabeled at the cell surface with lactoperoxidase. The complexes were then eluted from the cells with isotonic citrate buffer pH 3.2 or recovered by immunoprecipitation of cell lysates. The antigen and antibody moieties of the complexes were isolated by dissociating sucrose density gradient centrifugation or by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. A variety of preformed immune complexes were successfully isolated from serum with this approach. In addition, these techniques were used to isolate and identify the antigens in immune complexes in the serum of rabbits with chronic serum sickness and rats with Moloney virus-induced sarcomas. Methods were also developed for the production of antisera against the antigenic moiety of immune complexes isolated from serum. Repeated challenge of rabbits with whole Raji cells with bound complexes or eluates from such cells resulted in antibody production against the antigens of the immune complexes, although reactivity against cellular and serum components was also elicited. Monospecific antisera against the antigens in immune complexes were produced by immunizing rabbits with the alum-precipitated antigen isolated on sodium dodecyl sulfate-polyacrylamide gel electrophoresis. These techniques may be useful in isolating antigens in immune complex-associated diseases of unknown etiology.

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Selected References

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