Abstract
A 6-year-old previously healthy Japanese girl was found to have dipstick 2+ proteinuria and a goiter based on the results of a routine school medical examination. Her serum free-thyroxine level was 4.98 ng/dL (normal range 0.95–1.74 ng/dL), thyroid-stimulating hormone (TSH) was less than 0.003 μU/mL (0.34–3.88 μU/mL), anti-microsomal (anti-thyroid-peroxidase) antibody was 1600 T (up to 100), anti-thyroglobulin antibody was 400 T (up to 100), and TSH-receptor antibody was 84% (up to ±10%). These results are consistent with a diagnosis of Graves’ disease. Electron microscopy examination of a renal biopsy specimen revealed electron-dense deposits located in the subepithelial spaces, and immunofluorescence microscopy examination demonstrated bright granular stainings of immunoglobulin G along the glomerular capillary walls. These findings are characteristic of membranous nephropathy. To investigate the relationship between the membranous nephropathy and Graves’ disease, we carried out a second immunofluorescence study, which revealed that the immunoglobulin G granular deposits corresponded to glomerular granular staining of thyroid-peroxidase, whereas staining for thyroglobulin was absent. It was therefore assumed that the deposition of immune complexes mediated by thyroid-peroxidase had caused the membranous nephropathy in this patient. This is the first report of membranous nephropathy associated with Graves’ disease in which deposits of thyroid-peroxidase, rather than thyroglobulin, have been confirmed in the kidney.
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Shima, Y., Nakanishi, K., Togawa, H. et al. Membranous nephropathy associated with thyroid-peroxidase antigen. Pediatr Nephrol 24, 605–608 (2009). https://doi.org/10.1007/s00467-008-0973-0
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DOI: https://doi.org/10.1007/s00467-008-0973-0