title: [Nephrotic syndrome and acute interstitial nephritis after phenylbutazone].
abstract: A 59-year-old man developed a nephrotic syndrome and mild renal failure after treatment with phenylbutazone. Light microscope examination of a renal biopsy specimen showed minimal glomerular alterations, and electron microscopy showed diffuse fusion of epithelial cell foot processes without immune deposits. The interstitium revealed focal lymphocyte infiltrates identified as activated T-cells by immune histologic differentiation. The unusual combination of nephrotic syndrome with acute interstitial nephritis is a rare adverse reaction of nonsteroidal antiinflammatory drugs (NSAID). A disordered cell-mediated immunity could lead to interstitial infiltration of T-lymphocytes which, releasing lymphokines and a vascular permeability factor, cause the glomerular proteinuria. In addition, NSAID inhibition of prostaglandin synthesis may enhance production of these lymphocyte-derived substances. Since the nephrotic syndrome persisted 5 months after withdrawal of phenylbutazone, steroid therapy was initiated and 2 months later the renal insufficiency and proteinuria were resolved.
mesh_terms: D001416:Back Pain / Q000188:drug therapy; D006801:Humans; D007678:Kidney Glomerulus / Q000648:ultrastructure; D008297:Male; D008875:Middle Aged; D009395:Nephritis, Interstitial / Q000139:chemically induced*; D009404:Nephrotic Syndrome / Q000139:chemically induced*; D010653:Phenylbutazone / Q000009:adverse effects*; D013997:Time Factors
chemical_list: D010653:Phenylbutazone
vernacular_title: Nephrotisches Syndrom und akute interstitielle Nephritis nach Phenylbutazon.