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Lack of complement activation by human IgA immune complexes.

Abstract：

:Complement activation may play an important role in renal injury associated with glomerular deposition of IgA immune complexes. The ability of naturally occurring human IgA immune complexes (IgA-IC) and covalently cross-linked human IgA oligomers (X-IgA) to activate complement were examined in vitro and in vivo. Large-sized IgA-IC were isolated from a patient's serum by affinity purification (Jacalin-Sepharose) and gel chromatography. Stable X-IgA were prepared by chemical cross-linking with a heterobifunctional reagent, N-succinimdyl 3-(2-pyridyl-dithio) propionate (SPDP). Treatment of fresh normal human serum with large amounts of either IgA-IC or X-IgA failed to activate C3. The C3 consumption was measured immunochemically by the decrease of the B antigen on the native C3 and by the generation of iC3b. Addition of these complexes to serum did not result in cleavage of factor B. Administration of human IgA-IC or X-IgA to mice, killed after 6 h, resulted in glomerular deposition of IgA. Despite the presence of intense glomerular IgA deposits no C3 was detected. Collectively, these findings suggest that neither soluble nor renal localized human IgA complexes activate complement.

journal_name

Clin Exp Immunol

journal_title

Clinical and experimental immunology

authors

Imai H,Chen A,Wyatt RJ,Rifai A

subject

Has Abstract

pub_date

1988-09-01 00:00:00

pages

479-83

issue

3

eissn

0009-9104

issn

1365-2249

journal_volume

73

pub_type

杂志文章

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