Abstract
The tumor suppressor SMAD4, also known as DPC4, deleted in pancreatic cancer, is a central mediator of TGF-β signaling. It was previously shown that mice homozygous for a null mutation of Smad4 (Smad4−/−) died prior to gastrulation displaying impaired extraembryonic membrane formation and endoderm differentiation. Here we show that Smad4+/− mice began to develop polyposis in the fundus and antrum when they were over 6–12 months old, and in the duodenum and cecum in older animals at a lower frequency. With increasing age, polyps in the antrum show sequential changes from hyperplasia, to dysplasia, in-situ carcinoma, and finally invasion. These alterations are initiated by a dramatic expansion of the gastric epithelium where Smad4 is expressed. However, loss of the remaining Smad4 wild-type allele was detected only in later stages of tumor progression, suggesting that haploinsufficiency of Smad4 is sufficient for tumor initiation. Our data also showed that overexpression of TGF-β1 and Cyclin D1 was associated with increased proliferation of gastric polyps and tumors. These studies demonstrate that Smad4 functions as a tumor suppressor in the gastrointestinal tract and also provide a valuable model for screening factors that promote or prevent gastric tumorigenesis.
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Acknowledgements
We thank W Qiao for technical assistance and A Roberts and L Ferrin for critically reading the manuscript and helpful discussion.
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Xu, X., Brodie, S., Yang, X. et al. Haploid loss of the tumor suppressor Smad4/Dpc4 initiates gastric polyposis and cancer in mice. Oncogene 19, 1868–1874 (2000). https://doi.org/10.1038/sj.onc.1203504
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DOI: https://doi.org/10.1038/sj.onc.1203504
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