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Altered Differentiation of Hepatocytes in a Transgenic Mouse Model of Hepatocarcinogenesis

Laboratory of Pathology, Institute of Environmental Toxicology, Ibaraki 303–0043, Japan

Eric P. Sandgren

School of Veterinary Medicine, University of Wisconsin, Madison, Wisconsin 53706

Robert R. Maronpot

Laboratory of Experimental Pathology, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina 27709.

Transgenic mice carrying the SV40 T antigen (TAg) gene, which develop hepatocellular and biliary cell tumors by 4 mo of age, show ductular structures in the neonatal liver. Coexpression of c-myc with TAg increases the extent and persistence of ductular lesions and also accelerates tumor development. To analyze possible links between altered gene expression and cell differentiation and to determine the relationship between the ductular structures and tumor development in these mice, ductular cells in single (TAg) and bitransgenic (TAg X c-myc) mice were characterized for biliary and hepatocellular differentiation, transgene expression, and proliferation activity. The results show that the ductular cells in these transgenic mice have characteristics of biliary cells, including basement membrane formation, positive laminin staining, and bile duct-specific lectin (Dolichos biflorus agglutinin and peanut agglutinin) binding, and characteristics of hepatocytes, including albumin expression and ultrastructural features such as round nuclei with 1 or 2 nucleoli and well-developed cytoplasmic organelles. However, differences in transgene expression and cell proliferation between the ductular cells and nonductular hepatocytes were not apparent. Thus, the ductular cells could not be defined as tumor progenitor cells in these mouse livers. However, this model suggests that manipulation of gene expression can alter differentiation of hepatic parenchymal cells.

Key Words: Liver • neoplasms • ductular hepatocytes • cell differentiation • cell proliferation • bitransgenic mice

Toxicologic Pathology, Vol. 26, No. 4, 570-578 (1998)
DOI: 10.1177/019262339802600414


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