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Polymeric IgA and IgA rheumatoid factor decrease the capacity of serum to solubilize circulating immune complexes in patients with primary IgA nephropathy.

P F Schena, A Pastore, R A Sinico, V Montinaro and A Fornasieri
J Immunol July 1, 1988, 141 (1) 125-130;
P F Schena
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A Pastore
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R A Sinico
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V Montinaro
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A Fornasieri
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Abstract

Primary IgA nephropathy (IgAN) is characterized by the presence of immune complexes (IC), high levels of polymeric IgA (pIgA), and IgA rheumatoid factor (RF) in the blood. The impaired capacity of serum to solubilize IC in the presence of normal values of C hemolytic activity as well as high serum levels of C3, C4, and properdin factor B have led us to analyze whether pIgA and IgA RF from patients with IgAN where capable of inhibiting the capacity of normal human serum to solubilize immune precipitates (BSA-anti-BSA) preformed at equivalence. The results showed a significant reduced mean capacity of serum from patients with IgAN to solubilize "in vitro" immune precipitates (p less than 0.001) and significant high mean levels of pIgA (p less than 0.001) and IgA RF (p less than 0.005) in the blood. Increasing amounts of pIgA inhibited solubilization of IC in the fluid phase, and inhibitory activity was also shown by the IgA RF. There were inverse correlations between pIgA and the capacity of serum to solubilize IC (r = -0.36; p less than 0.05), and between IgA RF and the complement-mediated solubilization (r = -0.57; p less than 0.001). It is suggested that pIgA and IgA RF may be responsible for the impaired complement-mediated solubilization of serum and the persistence of insoluble nephritogenic IC in the blood of patients with primary IgAN.

  • Copyright © 1988 by American Association of Immunologists

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The Journal of Immunology
Vol. 141, Issue 1
1 Jul 1988
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Polymeric IgA and IgA rheumatoid factor decrease the capacity of serum to solubilize circulating immune complexes in patients with primary IgA nephropathy.
P F Schena, A Pastore, R A Sinico, V Montinaro, A Fornasieri
The Journal of Immunology July 1, 1988, 141 (1) 125-130;

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Polymeric IgA and IgA rheumatoid factor decrease the capacity of serum to solubilize circulating immune complexes in patients with primary IgA nephropathy.
P F Schena, A Pastore, R A Sinico, V Montinaro, A Fornasieri
The Journal of Immunology July 1, 1988, 141 (1) 125-130;
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Print ISSN 0022-1767        Online ISSN 1550-6606