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- W2073698274 abstract "Type one complement receptor (CR1) is the only physiological inhibitor of complement on podocytes. CR1 is lost in different glomerulopathies, in particular in lupus nephritis, in which it has been suggested that CR1 is removed by proteolysis from the cell membrane.To define whether proteolytic cleavage of CR1 on podocytes is a general phenomenon, we analyzed the expression of CR1 in different glomerulopathies using a monoclonal antibody against epitopes present on the extracellular portion of the molecule and a polyclonal antibody directed at the intracellular tail of CR1. The two antibodies were applied on sequential serial histologic sections of renal biopsy.In normal glomeruli, the two antibodies provided similar results, that is, strong staining of podocytes, and both were shown to recognize specifically CR1. Decreased expression of the extracellular portion of CR1 was observed in lupus nephritis (8/8), focal and segmental glomerulosclerosis (FSGS; 7/7), IgA nephritis (6/6), membranous glomerulonephritis (3/3), and minimal change disease (3/3). In each case, the decreased expression was accompanied by a simultaneous decrease of the expression of the intracellular tail of CR1 (Spearman's correlation coefficient rs = 0.951, P < 0.001). This observation was confirmed by analyzing focal glomerular lesions on sequential serial sections.These data indicate that there are no CR1 stumps on podocytes, even in lupus nephritis, and suggest that the CR1 loss on podocytes is not due to consumption but to decreased synthesis. A loss of CR1 synthesis might render podocytes highly sensitive to complement attack." @default.
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- W2073698274 date "2001-01-01" @default.
- W2073698274 modified "2023-10-13" @default.
- W2073698274 title "No complement receptor 1 stumps on podocytes in human glomerulopathies" @default.
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- W2073698274 doi "https://doi.org/10.1046/j.1523-1755.2001.00476.x" @default.
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