Epithelial tissues have varying degrees of susceptibility to Kras(G12D)-initiated tumorigenesis in a mouse model.

Ray KC, Bell KM, Yan J, Gu G, Chung CH, Washington MK, Means AL
PLoS One. 2011 6 (2): e16786

PMID: 21311774 · PMCID: PMC3032792 · DOI:10.1371/journal.pone.0016786

Activating mutations in the Kras gene are commonly found in some but not all epithelial cancers. In order to understand the susceptibility of different epithelial tissues to Kras-induced tumorigenesis, we introduced one of the most common Kras mutations, Kras(G12D), broadly in epithelial tissues. We used a mouse model in which the G12D mutation is placed in the endogenous Kras locus controlled by inducible, Cre-mediated recombination in tissues expressing cytokeratin 19 including the oral cavity, GI tract, lungs, and ducts of the liver, kidney, and the pancreas. Introduction of the Kras(G12D) mutation in adult mouse tissues led to neoplastic changes in some but not all of these tissues. Notably, many hyperplasias, metaplasias and adenomas were observed in the oral cavity, stomach, colon and lungs, suggesting that exposure to products of the outside environment promotes Kras(G12D)-initiated tumorigenesis. However, environmental exposure did not consistently correlate with tumor formation, such as in the small intestine, suggesting that there are also intrinsic differences in susceptibility to Kras activation. The pancreas developed small numbers of mucinous metaplasias with characteristics of early stage pancreatic intraepithelial neoplasms (PanINs), supporting the hypothesis that pancreatic ducts have the potential to give rise pancreatic cancer.

MeSH Terms (18)

Amino Acid Substitution Animals Aspartic Acid Carcinoma, Pancreatic Ductal Carcinoma in Situ Cell Transformation, Neoplastic Disease Models, Animal Disease Susceptibility Epithelium Glycine Mice Mice, Inbred C57BL Mice, Transgenic Mouth Neoplasms Mutation, Missense Pancreatic Neoplasms Papilloma Proto-Oncogene Proteins p21(ras)

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