M Mannik1, M H Wener. 1. University of Washington, Seattle 98195-6428, USA.
Abstract
OBJECTIVE: To determine if antibodies to the collagen-like region of C1q (C1q-CLR) are present in the glomerular immune deposits of patients with systemic lupus erythematosus (SLE). METHODS: Kidney tissues were obtained at autopsy, glomeruli were isolated, and glomerular basement membrane fragments were prepared. Antibodies were extracted with low pH or with DNase. RESULTS: The concentrations of antibodies to C1q-CLR recovered from the glomeruli were > or =50-fold higher per unit of IgG than that found in the serum or in the serum and interstitial fluid entrained in glomeruli. Antibodies to C1q-CLR were recovered from glomeruli of 4 of 5 patients with proliferative glomerulonephritis at autopsy. CONCLUSION: This is the first demonstration that antibodies to C1q-CLR are deposited and concentrated in the renal glomeruli of patients with SLE. These antibodies, thus, have the potential of contributing to the pathogenesis of lupus glomerulonephritis.
OBJECTIVE: To determine if antibodies to the collagen-like region of C1q (C1q-CLR) are present in the glomerular immune deposits of patients with systemic lupus erythematosus (SLE). METHODS: Kidney tissues were obtained at autopsy, glomeruli were isolated, and glomerular basement membrane fragments were prepared. Antibodies were extracted with low pH or with DNase. RESULTS: The concentrations of antibodies to C1q-CLR recovered from the glomeruli were > or =50-fold higher per unit of IgG than that found in the serum or in the serum and interstitial fluid entrained in glomeruli. Antibodies to C1q-CLR were recovered from glomeruli of 4 of 5 patients with proliferative glomerulonephritis at autopsy. CONCLUSION: This is the first demonstration that antibodies to C1q-CLR are deposited and concentrated in the renal glomeruli of patients with SLE. These antibodies, thus, have the potential of contributing to the pathogenesis of lupus glomerulonephritis.
Authors: L A Trouw; M A Seelen; R Visseren; J M G J Duijs; H Benediktsson; E de Heer; A Roos; C van Kooten; M R Daha Journal: Clin Exp Immunol Date: 2004-01 Impact factor: 4.330
Authors: Leendert A Trouw; Tom W L Groeneveld; Marc A Seelen; Jacques M G J Duijs; Ingeborg M Bajema; Frans A Prins; Uday Kishore; David J Salant; J Sjef Verbeek; Cees van Kooten; Mohamed R Daha Journal: J Clin Invest Date: 2004-09 Impact factor: 14.808