Abstract
Mutations in the tumour suppressor genes SMAD4 (DPC4, deleted in pancreatic cancer locus 4) and adenomatous polyposis coli (APC) have been implicated in the development of pancreatic cancer in humans. Treatment of wild-type, Smad4+/−, ApcMin/+ or ApcMin/+Smad4+/− mice with N-Nitroso-N-Methyl Urea (NMU) results in abnormal foci in pancreatic acinar cells characterized by increased levels of β-catenin. Previously such foci have been shown to be the precursors of pancreatic neoplasia. Interestingly, only NMU-treated ApcMin/+Smad4+/− mice exhibit a significant increase in abnormal pancreas, which was found to be due to increased number of abnormal foci rather than increased focus size. A range of foci sizes were analysed, but only smaller abnormal foci were characterized by morphological nuclear atypia. These studies suggest functional co-operation between TGF-β and Wnt signalling pathways in the suppression of pancreatic tumorigenesis in the mouse.
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Acknowledgements
We thank the Staff in the MMTU, Histology Laboratory and Pathology Imaging Suite, K Takaku for assistance with the Smad4 Immunohistochemistry, D Bruce and R James for assistance with DNA-DNA in situ hybridisation. NJ Sphyris, O Sansom, SM Sheahan, M Link and PA Barfoot we thank for helpful discussions. This work was funded by the Cancer Research Campaign (now Cancer Research UK).
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Cullingworth, J., Hooper, M., Harrison, D. et al. Carcinogen-induced pancreatic lesions in the mouse: effect of Smad4 and Apc genotypes. Oncogene 21, 4696–4701 (2002). https://doi.org/10.1038/sj.onc.1205673
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DOI: https://doi.org/10.1038/sj.onc.1205673