Authors: Yoshie Segawa Satoshi Hisano Misao Matsushita Teizo Fujita Shinichi Hirose Morishige Takeshita Hiroshi Iwasaki
Publish Date: 2010/02/12
Volume: 25, Issue: 6, Pages: 1091-1099
Abstract
The aim of our study was to clarify the association between immunoglobulin GIgG subclasses and the complement pathway in patients with idiopathic membranous nephropathy MN Immunofluorescence IF was performed in 16 MN patients and 20 controls using antibodies against IgG IgA IgM C1q C3c C4d IgG1 IgG2 IgG3 IgG4 mannose binding lectin MBL C4binding protein C4bp factor B C5b9 and CD59 MN was classified into two types segmental MN SMN six patients and global MN GMN ten patients according to the distribution of IgG deposits along the glomerular capillary wall No deposition of any antibody was found in the controls IF revealed IgG1 IgG3 C1q C3c C4d C4bp C5b9 and CD59 deposits in patients with SMN whereas IgG1 IgG2 IgG3 IgG4 C3c C4d MBL factor B C4bp C5b9 and CD59 deposits were detected in those with GMN There was a higher deposition of IG1 IgG2 and IgG4 in patients with GMN than in those with SMN whereas the intensity of C1q deposits was higher in SMN than in GMN patients In contrast the intensity of factor B and MBL was higher in GMN than in SMN patients This is the first report of SMN patients showing complement activation of the classical pathway associated with IgG1 and IgG3 and GMN patients showing complement activation of both the alternative and lectin pathways associated with IgG2 and IgG4
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