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. 1988 Apr;72(1):55–59.

Abnormal clearance of soluble aggregates of human immunoglobulin G in patients with systemic lupus erythematosus.

S Lobatto 1, M R Daha 1, F C Breedveld 1, E K Pauwels 1, J H Evers-Schouten 1, A A Voetman 1, A Cats 1, L A Van Es 1
PMCID: PMC1541487  PMID: 3396221

Abstract

In the present study, we tested mononuclear phagocyte system function in nine healthy controls and 15 SLE patients with complement activating 123I-labelled aggregates of human IgG (AIgG). Clearance half-time of AIgG was 26 +/- 8 min in controls, compared to 58 +/- 27 min in patients (P less than 0.005). Binding of AIgG to erythrocytes was significantly lower in patients, 9.3 +/- 8.1 vs 24 +/- 20% (P less than 0.05). The increase of C3a-levels in plasma was significantly lower in patients than in controls (P less than 0.05 at 3 and 8 min), suggesting less complement activation. Liver and spleen uptake of 123I-AIgG was measured with a gamma camera and expressed as liver/spleen uptake ratios. In patients, the liver/spleen uptake ratios were significantly higher than in controls at 15 min, 3.8 +/- 2.0 vs 2.31 +/- 0.7 (P less than 0.05), due to less splenic uptake of AIgG. Correlations between clearance half-time or liver/spleen uptake ratios and immune complex levels or disease activity were not found. This study indicates that clearance of soluble AIgG is abnormal in patients with SLE, due to decreased splenic uptake of AIgG.

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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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