Accelerated growth of intestinal tumours after radiation exposure in Mlh1-knockout mice: evaluation of the late effect of radiation on a mouse model of HNPCC.

International Journal of Experimental Pathology
Yutaka TokairinYoshiya Shimada

Abstract

Mlh1-knockout mice have been developed as a useful model of hereditary non-polyposis colorectal cancer (HNPCC). In this study, we analyzed the pathology of gastrointestinal tumours (GIT) in these mice in detail and examined the possible effects of ionizing radiation on the induction of intestinal tumours to evaluate the late response to radiotherapy in HNPCC. Mlh1-/- mice spontaneously developed GIT and thymic lymphomas by 48 weeks. GIT included not only well differentiated adenocarcinomas but also poorly differentiated and mucinous adenocarcinomas, suggesting that this mouse is a good model for HNPCC. In contrast to colon cancers from HNPCC patients, however, carcinomas of Mlh1-/- mice expressed p53 and showed a lack of transforming growth factor (TGF)-betaRII mutation, which resulted in the expression of TGF-betaRII protein. Irradiation of 10-week-old Mlh1-/- mice accelerated GIT development but had little effect at 2 weeks. Mlh1+/- and Mlh1+/+ mice were not susceptible to spontaneous or radiation-induced thymic lymphomas and GIT until 72 weeks after birth. The development and pathology of GIT in Mlh1-/- mice suggest that this mouse is a good model for HNPCC, although tumour-related responsible genes might be different from H...Continue Reading

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Citations

Sep 6, 2008·International Journal of Colorectal Disease·Heiying JinMin Ni
Aug 12, 2009·Cancer Causes & Control : CCC·Wade S SamowitzMartha L Slattery
Oct 16, 2012·Journal of Gastrointestinal Cancer·Juliette SheridanJacintha O'Sullivan
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Mar 10, 2007·Oncology·Kazuki TaniguchiYoshiya Shimada
Apr 16, 2018·Stem Cells Translational Medicine·Rutulkumar PatelScott M Welford

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