Fc alpha R expression on polymorphonuclear leukocyte and superoxide generation in IgA nephropathy.

Abstract:

:Superoxide (O2-) production and Fc alpha R antigen expression of circulating polymorphonuclear leukocytes (PMNL) isolated from patients with IgA nephropathy (IgAN) and non-IgA mesangial proliferative glomerulonephritis (PGN) and healthy volunteers were investigated to establish their biological importance in the immunopathogenesis of mesangial proliferative glomerulonephritis. PMNL from both patient groups showed increased O2- production when stimulated with N-formyl methionyl leucyl phenylalanine (FMLP) and phorbol myristate acetate (PMA). The increased O2- generation demonstrated a positive correlation with the degree of proteinuria. Aggregated IgA caused enhanced O2- production only in patients with IgAN who also showed a significant correlation with proteinuria. Increased expression of Fc alpha R on circulating PMNL was observed in IgAN patients as determined by flow cytometric analysis. The amount of Fc alpha R on PMNL was positively correlated with O2- generation triggered with IgA aggregates. These results suggest that: 1. Circulating PMNL may potentially be participating in the pathogenesis of glomerular injury in mesangial proliferative glomerulonephritis, and 2. IgA aggregates/immune complexes may contribute to the immunopathogenesis of IgAN through augmenting the Fc alpha receptor-mediated generation of superoxide anion.

journal_name

Kidney Int

journal_title

Kidney international

authors

Kashem A,Endoh M,Nomoto Y,Sakai H,Nakazawa H

doi

10.1038/ki.1994.114

subject

Has Abstract

pub_date

1994-03-01 00:00:00

pages

868-75

issue

3

eissn

0085-2538

issn

1523-1755

pii

S0085-2538(15)58379-8

journal_volume

45

pub_type

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