ArticleKidney medicine2025
Ribbon-like Electron-Dense Deposits in the Subepithelial Layer of Diffuse and Global Glomerular Basement Membrane in Neural Epidermal Growth Factor-like 1-Positive Membranous Nephropathy: A Case Report.
Article in Kidney medicine, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
An 88-year-old man was referred with peripheral edema, pleural effusion and nephrotic syndrome that had developed 3 months prior. Based on a kidney biopsy, the majority of glomeruli exhibited capillary wall thickening and the slight area of glomeruli exhibited spike formations and bubbly appearances. Fluorescent immunostaining showed global deposition of neural epidermal growth factor-like 1 (NELL-1), immunoglobulin (Ig) G1 and complement (C) 3c within the glomerular capillary wall. Electron microscopy showed the presence of unique subepithelial electron-dense deposits distributed in a ribbon-like manner along more than 75% of glomerular capillary walls. Fluorescent immunostaining showed no positivity for other recently identified antigens associated with membranous nephropathy, including M-type phospholipase A2 receptor (PLA2R), thrombospondin type 1 domain-containing 7A (THSD7A), and exostosin 1 (EXT1). A comprehensive medical examination for malignant diseases yielded negative results, and there was no discernible change in κ/λ staining. Additionally, serum complement levels were within the normal range. The patient was therefore diagnosed with NELL-1-positive membranous nephropathy and has been refractory to the treatment with prednisolone, cyclosporine (CyA) and rituximab for 10 months. According to previous reports, segmental or incomplete IgG capillary loop staining have been observed in 93.4% of cases of NELL-1-positive membranous nephropathy. Diffuse and global ribbon-like deposits, as observed in this case, are exceedingly rare.
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