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Expression of c-fos and c-myc protooncogenes in an immortalized hepatocyte line harbouring SV40 T antigen and hGH as transgenes

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Abstract

A clonal hepatocyte line (FMH-202-2), derived from livers of fetal transgenic mice harbouring human growth hormone (hGH) and SV40 T antigen as transgenes, was used in the investigation of protooncogene expression involved in liver-specific growth control and/or in hepatocellular transformation. In this model system, representing an immortalized, yet untransformed phenotype, the transgenes hGH and SV40 T antigen were expressed constitutively. The c-fos protooncogene was induced by incubation with insulin, epidermal growth factor (EGF) and insulin-like growth factor (IGF-I) in a transient manner comparable to its expression in primary murine hepatocytes. Elucidation of second messenger mechanisms demonstrated that c-fos induction by hepatotrophic growth factors was not mediated by protein kinase C. In contrast to primary hepatocytes, the c-myc protooncogene exhibited a constitutive expression pattern which was independent of growth factor stimulation. These results indicate that apart from hGH and SV40 T antigen, c-myc may play a role in cellular immortalization, but that constitutive expression of these genes, even in combined coexpression, does not suffice to induce the transformed phenotype.

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Hirsch-Ernst, K.I., Paul, D., Kahl, G.F. et al. Expression of c-fos and c-myc protooncogenes in an immortalized hepatocyte line harbouring SV40 T antigen and hGH as transgenes. Transgenic Research 2, 101–108 (1993). https://doi.org/10.1007/BF01969383

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