Journal Article

<i>Ha-ras</i><sup>Va112</sup> but not <i>p53</i><sup>Ser247</sup> leads to a significant neoplastic transformation rate of the putative rat liver stem cells (oval cell)

Roger Becker, Birgit Luthgens, Franz Oesch, Hans-Peter Dienes and ablo Steinberg

in Carcinogenesis

Volume 17, issue 12, pages 2635-2640
Published in print December 1996 | ISSN: 0143-3334
Published online December 1996 | e-ISSN: 1460-2180 | DOI: http://dx.doi.org/10.1093/carcin/17.12.2635
Ha-rasVa112 but not
                        p53Ser247 leads to a significant neoplastic
                    transformation rate of the putative rat liver stem cells (oval
                    cell)

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In order to test the controversially discussed hypothesis that oval cells are part of a liver stem cell compartment and can give rise to cholangiocellular as well as hepatocellular carcinomas in the course of liver carcinogenesis, we trans-fected an oval cell line established in our laboratory with an oncogenically activated genomic Ha-ras clone (pUC EJ 6.6), carrying a valine at position 12 instead of the wild-type glycine, or a rat p53 cDNA mutated by site-directed mutagenes is at codon 247, which corresponds to codon 249 in the human p53. This codon is of particular interest since it represents a mutation hotspot observed in hepatocellular carcinoma especially in regions with high aflatoxin B1 exposure. Independent Ha-rasVal112Wain and p53Ser247 recombinant clones were subcutaneously injected into syngeneic newborn rats and the resulting tumours were analysed histopathologically. Each of two p53Ser247 clones gave negligible tumour yields (one tumour out of 13 injected animals), whereas each of two Ha-rasVal12 clones gave marked tumour yields (four tumours out of 13 and seven out of 12 treated animals, respectively). In addition, the p53Ser247-induced tumours appeared only after 11 months and were small, whereas the Ha-ras-induced tumours appeared already after 6–8 weeks and grew rapidly. Histopathological analysis of the tumours revealed only undifferentiated carcinomas. Interestingly, one tumour that arose upon injection of Ha-rasVal12-transfected cells stained positive for albumin, showing at least a partial hepatocytic differentiation.

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Subjects: Clinical Cytogenetics and Molecular Genetics

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