Abstract
Renal biopsies from seven patients with Congo red-negative amyloid-like fibrillary glomerulopathy (FGP) were examined by protein A gold immuno-electron microscopy. Ultrastructurally, the fibrils in all cases exhibited positive immunostaining for IgG, both Ig light chains, C3, and amyloid P component (AP), but did not show positive immunostaining for glomerular basement membrane (GBM)-associated proteins (collagen type IV and heparan-sulfate proteoglycans) or microfibril-associated proteins (fibronectin and fibrillin). In a triple-label study, AP and IgG were colocalized along the same fibril, whereas the gold probes for the detection of collagen type IV were absent. The results suggest that the fibrils are comprised of polyclonal IgG and C3 that bind AP. AP was immunolocalized sparsely but regularly along the lamina rara interna of normal GBM. AP was absent in the fibrils in a case of diabetic glomerulopathy, was scattered randomly without specificity for the electron-dense deposits in the GBM of membranous glomerulopathy, and lined up regularly along the fibrils in amyloid deposits. FGP is an entity in which the fibrils bind AP but lack the beta-pleated sheet structure necessary for Congo red staining that is typical of amyloid.
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