Abstract
The gene CTNNB1 encoding β-catenin is mutated in about 30% of hepatocellular carcinoma, generally often combined with other genetic alterations. In transgenic mice, it has been shown that activation of β-catenin in more than 70% of all hepatocytes causes immediate proliferation leading to hepatomegaly. In this study we established a novel mouse model where β-catenin is activated only in individual, dispersed hepatocytes. Hepatocyte-specific expression of activated point-mutated β-catenin (human β-cateninS33Y) was established using the Cre/loxP system. Expression of several downstream targets of β-catenin signaling such as glutamine synthetase and several cytochrome P450 isoforms was confirmed by immunostaining. Only a minor portion of hepatocytes expressed the β-cateninS33Y transgene, which were mainly positioned as dispersed individual cells within the normal liver parenchyma. The hepatocytes with activated β-catenin did not show increased proliferation and the mice did not develop hepatomegaly. In conclusion, activated β-catenin in single hepatocytes induces a gene expression pattern in hepatocytes which is similar to that of Ctnnb1-mutated mouse liver tumors, but is apparently not sufficient to induce increased cell proliferation. Therefore, onset of proliferation seems to require concomitant activation of β-catenin in clusters of hepatocytes, suggesting a role of cell–cell communication in this process.
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Acknowledgment
We acknowledge technical assistance by Elke Zabinsky, Johanna Mahr, and Silvia Vetter. We also acknowledge the gift of pβCatS33Y/CIneo by Dr. O. Müller (Dortmund, Germany), of CYP1A2 antiserum by Dr. R. Wolf (Dundee, UK), and of Lect2 antibody by Dr. S. Yamagoe (Tokyo, Japan). This work was supported by the Deutsche Krebshilfe [grant 106356], by the European Union [grant Cancer-Sys], by the Deutsche Forschungsgemeinschaft [grant SFB773], and by the Bundesministerium für Bildung und Forschung-funded network “Virtual liver”.
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Schreiber, S., Rignall, B., Braeuning, A. et al. Phenotype of single hepatocytes expressing an activated version of β-catenin in liver of transgenic mice. J Mol Hist 42, 393–400 (2011). https://doi.org/10.1007/s10735-011-9342-6
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DOI: https://doi.org/10.1007/s10735-011-9342-6