title: Crescent-forming mechanism in an irreversible Thy-1 model in rats.
abstract: BACKGROUND
  The crescent-forming mechanism has not yet been fully clarified and a cell which constitutes a crescent still remains controversial. This study was undertaken to analyze the crescent-forming mechanism in an irreversible Thy-1 model by applying a new marker-recognizing monoclonal antibody (mAb) OS-3.
  
  
  METHODS
  An irreversible Thy-1 model was induced by an intravenous injection of 500 microg of anti-Thy-1 mAb 1-22-3 to unilaterally nephrectomized Wistar rats. Seven rats were sacrificed 3, 7 and 14 days after the mAb injection respectively and the renal tissues were examined histologically and immunohistochemically.
  
  
  RESULTS
  Inflammatory cells were demonstrated mostly in the interstitium, but they were located within advanced cellular crescents in later stages. OS-3, which stained parietal glomerular epithelial cell (PGEC) only partly in a normal rat kidney section, reacted to PGEC more extensively at day 3 and also with cellular crescents at day 7. During the course of this model the podocytes lost their characteristic to be stained by anti-podocalyxcin Ab and obtained a new marker of a diseased state, i.e. to be positively stained by OS-3.
  
  
  CONCLUSIONS
  Glomerular epithelial cells, but not inflammatory cells, are suggested to directly participate in the crescent formation in early stages, and podocytes with phenotypic changes might be partly involved in the formation of the crescents.
authors.affiliation: Department of Cell Biology, Institute of Nephrology, Niigata University School of Medicine, Niigata, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Oyanagi
authors.forename: M
authors.initials: M
authors.lastname: Orikasa
authors.forename: H
authors.initials: H
authors.lastname: Kawachi
authors.forename: Y
authors.initials: Y
authors.lastname: Ito
authors.forename: H
authors.initials: H
authors.lastname: Koike
authors.forename: F
authors.initials: F
authors.lastname: Gejo
authors.forename: F
authors.initials: F
authors.lastname: Shimizu
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000494:pharmacology*; D004195:Disease Models, Animal; D004847:Epithelial Cells / Q000473:pathology; D005260:Female; D005455:Fluorescent Antibody Technique; D005921:Glomerulonephritis / Q000276:immunology* / Q000473:pathology*; D007678:Kidney Glomerulus / Q000276:immunology / Q000473:pathology / Q000648:ultrastructure; D008264:Macrophages / Q000473:pathology; D016253:Microscopy, Immunoelectron; D011507:Proteinuria / Q000276:immunology / Q000473:pathology; D051381:Rats; D017208:Rats, Wistar; D018800:Thy-1 Antigens / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D018800:Thy-1 Antigens