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  • Title: A membranous nephropathy associated with adult polycystic kidney disease.
    Author: Shikata K, Makino H, Ota Z.
    Journal: Clin Nephrol; 1991 Nov; 36(5):223-7. PubMed ID: 1752071.
    Abstract:
    A 53-year-old woman with adult polycystic kidney disease (PKD) developed a nephrotic syndrome. Evaluation of the renal biopsy specimens showed typical findings of membranous nephropathy (MN). There are few reports of nephrotic syndrome associated with PKD and only one proved to be MN. The possible mechanism of the association of PKD with MN was evaluated. Autoantibodies against the brush border were not detected in this patient's serum by indirect immunofluorescence. Three monoclonal antibodies against the tubular brush border and epithelial cell of distal tubulus did not react with subepithelial deposits in the biopsy specimen. Therefore tubular brush border antigen which was reported to induce membranous nephropathy was not detected in the immune complexes deposited in the glomeruli. So we could not determine any direct relationship between PKD and MN. The reaction of antibodies against basement membrane components (type IV collagen, laminin, fibronectin, heparansulfate proteoglycan) with the basement membranes of the cysts was evaluated by indirect immunofluorescence. The reaction with anti-heparansulfate proteoglycan antibody was decreased compared with normal tubular basement membrane. The reactivity to anti-fibronectin antibody was remarkably increased in the cystic walls, tubules, and interstitium. Changes of tubular basement membrane antigens was observed in PKD.
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