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© 1996 Oxford University Press

research-article

CANCER BIOLOGY: Analysis of differentiation-associated proteins in rat bladder carcinogenesis

Kumiko Ogawa 1, Tung-Tien Sun 2 and Samuel M. Cohen 1 3

1Department of Pathology and Microbiology and Eppley Institute for Research on Cancer and Allied Diseases, University of Nebraska Medical Center 600 South 42nd Street, Omaha, NE 68198-3135
2Epithelial Biology Unit, The Ronald O.Perelman Department of Dermatology and the Department of Pharmacology, Kaplan Comprehensive Cancer Center, New York University School of Medicine New York, NY 10016, USA

3To whom reprint requests should be addressed

Uroplakins are the major integral membrane proteins synthesized in terminally differentiated, superficial urothel-ial cells. Alteration of cell differentiation during rat urinary bladder carcinogenesis was analyzed immunohistochemi-cally 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.


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