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  • Title: Reversible nephrotic syndrome in a patient with amyloid A amyloidosis of the kidney following methicillin-resistant Staphylococcus aureus infection.
    Author: Yokota N, Morita H, Iwasaki S, Ooba H, Ideura T, Yoshimura A.
    Journal: Nephron; 2001 Feb; 87(2):177-81. PubMed ID: 11244314.
    Abstract:
    A common form of methicillin-resistant Staphylococcus aureus (MRSA) associated glomerulonephritis is either an endocapillary proliferative glomerulonephritis or a crescentic glomerulonephritis. This report describes the development of reversible nephrotic syndrome following MRSA infection in a patient with amyloid A amyloidosis. The patient had been diagnosed as having rheumatoid arthritis for 50 years. Suppurative arthritis due to MRSA became complicated 2 years prior to admission to our hospital. In the meantime, a nonnephrotic-range proteinuria developed. Two weeks before admission, nephrotic syndrome developed. The serum creatinine level remained unchanged throughout the course, but common features characteristic of MRSA-associated glomerulonephritis were observed in this patient, such as elevated serum IgG and IgA levels. A renal biopsy specimen showed glomerular amyloid A amyloidosis of a nodular type, infiltrated mononuclear cells in the mesangium, deposition of IgG, IgA, and C3, and swelling of glomerular endothelial cells. There were no crescentic glomeruli. Following surgical eradication of the MRSA focus in the right knee joint, nephrotic syndrome disappeared. Hence, it was highly possible that MRSA infection induced a reversible nephrotic syndrome by causing reversible injuries to glomerular endothelial cells. The description of this case serves to illustrate the range of MRSA infections that may cause various forms of glomerulonephritides.
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