title: Rapidly progressive glomerulonephritis in a patient with Chlamydia pneumoniae infection: a possibility of superantigenic mechanism of its pathogenesis.
abstract: Herein we describe a case of a patient with rapidly progressive glomerulonephritis after Chlamydia pneumoniae infection. An 88-year-old woman who had had C. pneumoniae infection two months previously was admitted to our hospital with complaints of dyspnea and generalized edema. Laboratory tests revealed acute renal failure, polyclonal hypergammaglobulinemia, highly increased level of C-reactive protein, and hematoproteinuria. A renal biopsy revealed mesangial and endocapillary proliferative glomerulonephritis with crescents. She responded to high-dose steroids, cyclophosphamide, minocycline, and plasma exchange treatment with the remission of oliguric renal failure. The percentage of the subset of CD3+ TCR+ Vbeta11+ cells markedly increased to 9.6% (normal range: < 1.04%) at the onset of the disease and decreased to 0.1% after the treatment. These clinicopathological features were similar to those of superantigen-associated glomerulonephritis after methicillin-resistant Staphylococcus aureus infection. We suggest that the superantigenic mechanism is one of the possible pathomechanisms of this glomerulonephritis.
authors.affiliation: Department of Nephrology, Showa University School of Medicine, Tokyo, Japan. iyoda@med.showa-u.ac.jp
authors.forename: M
authors.initials: M
authors.lastname: Iyoda
authors.forename: T
authors.initials: T
authors.lastname: Hato
authors.forename: K
authors.initials: K
authors.lastname: Matsumoto
authors.forename: J
authors.initials: J
authors.lastname: Ito
authors.forename: Y
authors.initials: Y
authors.lastname: Ajiro
authors.forename: A
authors.initials: A
authors.lastname: Kuroki
authors.forename: T
authors.initials: T
authors.lastname: Shibata
authors.forename: K
authors.initials: K
authors.lastname: Kitazawa
authors.forename: T
authors.initials: T
authors.lastname: Sugisaki
mesh_terms: D000368:Aged; D002690:Chlamydia Infections / Q000150:complications*; D016993:Chlamydophila pneumoniae / Q000276:immunology*; D018450:Disease Progression; D005260:Female; D005921:Glomerulonephritis / Q000209:etiology* / Q000276:immunology* / Q000473:pathology; D006801:Humans; D007150:Immunohistochemistry; D018089:Superantigens / Q000276:immunology*
chemical_list: D018089:Superantigens