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Pathological implications of linear immunoglobulin G staining on the glomerular capillary walls in a case of infection-related glomerulonephritis.
Pathology International 2016 September
We report a 32-year-old man with nephrotic syndrome and preceding symptom of infection. He had renal insufficiency, hypocomplementemia, and elevated titer of anti-streptolysin O. Renal biopsy showed mesangial hypercellularity and focal segmental endocapillary hypercellularity with double contour of the glomerular basement membrane (GBM). Immunofluorescence study showed granular C3 staining on the mesangial areas and glomerular capillary walls (GCWs) and linear immunoglobulin G (IgG) staining on GCWs. Electron microscopy revealed sporadic subepithelial humps, discontinuous small and thin deposits in the endothelial side of the GBM and mesangial deposits. He was diagnosed with infection-related glomerulonephritis (IRGN) with the striking finding of linear IgG staining, which is unusual in IRGN. The patient did not have diabetes mellitus or anti-GBM disease. The patient's serum seemed not to contain IgG, which can bind to GCW. He showed normalization of complement within two months after relief from infection symptoms and a trend toward improvement in proteinuria, hematuria and renal function over 14 months. We discuss the possible mechanisms of linear IgG staining in our case based on clinical and experimental studies on IRGN with cationic bacterial protein as antigen.
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