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. 1977 Dec;30(3):384–392.

Failure to detect circulating DNA--anti-DNA complexes by four radioimmunological methods in patients with systemic lupus erythematosus.

S Izui, P H Lambert, P A Miescher
PMCID: PMC1541140  PMID: 606451

Abstract

The presence of DNA-anti-DNA complexes in sera from patients with systemic lupus erythematosus (SLE) was investigated by two new radioimmunoassays (RIA) developed for this purpose and by measuring the C1q and DNA binding activity of serum before and after treatment with DNAse. Two direct RIA developed in this study were based on the reactivity of [3H]actinomycin D ([3H]ACT-D) or solid-phase methylated bovine serum albumin (mBSA) with DNA-anti-DNA complexes. DNA-anti-DNA complexes prepared in vitro could be efficiently detected at various antigen--antibody ratios by these two RIA. Increased levels of circulating immune complexes as indicated by the C1q binding test were found in 52% of SLE sera. However, the frequency of specific DNA-anti-DNA complexes detected in SLE sera was very low. Only 6% of sera exhibited an increased value deviating by more than three s.d. from the normal mean when tested with the [3H]ACT-D binding RIA or the solidphase mBSA RIA. On the other hand, there was no significant difference in the serum C1q or DNA binding activity after treatment with DNAse. These results suggest that DNA-anti-DNA complexes do not occur frequently in circulating blood and represent only a very small portion of the immune complexes detected in serum from patients with SLE.

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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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