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. 1977 Dec;36(6):540–548. doi: 10.1136/ard.36.6.540

Immune reactants in cryoproteins. Relationship to complement activation.

M R Wilson, C M Arroyave, L Miles, E M Tan
PMCID: PMC1000160  PMID: 339851

Abstract

Cryoproteins were isolated from the serum of 5 patients with essential cryoglobulinaemia 5 patients with rheumatoid arthritis, and 2 patients with Sjøgren's syndrome. These cryoprecipitates contained IgG, IgM, and IgA as well as complement proteins C1q, C4, C3, and factor B. The cryoprecipitates were analysed further for content of antibody and antigen, and were tested for their ability to activate complement. In the cryoprecipitates of 2 patients with Sjøgren's syndrome, nuclear antigen and antinuclear antibody characteristic of an immunological specificity found in Sjøgren's syndrome were shown. The cryoprecipitates of 6 other patients contained rheumatoid factor and antibody to a lymphocyte nuclear antigen. The solubilized cryoprecipitates were tested by in vitro assays for their ability to activate complement by the classical or alternative pathways. All 12 cryoprecipitates activated the classical pathway. 9 of the 12 cryoprecipitates also activated the alternative complement pathway under conditions which did not involve activation of C1 and C4. These studies show that a high percentage of cryoprecipitates consist at least in part of immune reactants. We discuss the relationship of these findings to pathogenetic mechanisms in disease.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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