title: Analysis of differentiation-associated proteins in rat bladder carcinogenesis.
abstract: Uroplakins are the major integral membrane proteins synthesized in terminally differentiated, superficial urothelial cells. Alteration of cell differentiation during rat urinary bladder carcinogenesis was analyzed immunohistochemically for the expression of uroplakins. Expression of uroplakins was compared in N-[4-(5-nitro-2-furyl)-2-thiazolyl]-formamide (FANFT)-, uracil-, sodium saccharin- or sodium ascorbate-induced urothelial simple hyperplasia, papillary-nodular hyperplasia, papilloma and carcinoma. In controls, uroplakins were located only in superficial cells, especially the luminal surface membrane. In FANFT-induced hyperplasia, including simple hyperplasia, intermediate cells also stained and the staining pattern was disorderly and intermittent. In uracil-induced simple hyperplasia, intermediate cells were stained but in an orderly fashion. In sodium saccharin- or sodium ascorbate-induced simple hyperplasia, superficial cells were swollen but alterations were not observed in the staining pattern. In carcinoma induced by FANFT and uracil, uroplakin expression was very disorderly and focal, usually with no expression on surface cells. It appears that disorderly differentiation is an index of bladder malignancy and is an early event in FANFT-induced lesions but a late event in uracil-, sodium saccharin- and sodium ascorbate-induced lesions.
authors.affiliation: Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha 68198-3135, USA.
authors.forename: K
authors.initials: K
authors.lastname: Ogawa
authors.forename: T T
authors.initials: TT
authors.lastname: Sun
authors.forename: S M
authors.initials: SM
authors.lastname: Cohen
mesh_terms: D000818:Animals; D005200:FANFT / Q000633:toxicity; D008297:Male; D008562:Membrane Glycoproteins / Q000032:analysis*; D008565:Membrane Proteins / Q000032:analysis*; D051381:Rats; D011916:Rats, Inbred F344; D012439:Saccharin / Q000633:toxicity; D014498:Uracil / Q000633:toxicity; D001749:Urinary Bladder Neoplasms / Q000139:chemically induced / Q000737:chemistry*; D060170:Uroplakin II; D060171:Uroplakin III
chemical_list: D008562:Membrane Glycoproteins; D008565:Membrane Proteins; D060170:Uroplakin II; D060171:Uroplakin III; D014498:Uracil; D005200:FANFT; D012439:Saccharin