Inherited and acquired risk factors in colonic neoplasia and modulation by chemopreventive interventions

Martin Lipkin, Ran Yang, Winfried Edelmann, Harold Newmark, Kun Hua Fan, Mauro Risio, Raju Kucherlapati

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

The progressively abnormal development of epithelial cells prior to tumor development leads to widely differing chemopreventive approaches. The diversity of these approaches has resulted in different assays to measure the activities of the agents. To apply these assays to preclinical studies, we have developed rodent models in which different stages of evolution of colonic neoplasia are expressed. In one model mice carrying a truncated Apc allele with a nonsense mutation in exon 15 have been generated by gene targeting and embryonic stem cell technology (Apc1638 mice). These mice develop multiple gastrointestinal lesions including adenomas and carcinomas, focal areas of high grade dysplasia (FAD) and polypoid hyperplasias with FADS. The incidence of inherited colonic neoplasms has now been modulated by a chemopreventive regimen. Colonic lesions significantly increased in Apc1638 mice on a Western-style diet, compared to Apc1638 mice on AlN-76A diet which has lower fat content and higher calcium and vitamin D. These studies have also been carried out in normal mice, and have demonstrated without any chemical carcinogen that a Western-style diet induced colonic tumorigenesis. Modulation of cell proliferation has also been induced by Western-style diets in other organs including mammary gland, pancreas and prostate. These findings are leading to the development of new preclinical models for evaluating the efficacy of many classes of chemopreventive agents.

Original languageEnglish (US)
Pages (from-to)136-141
Number of pages6
JournalJournal of Cellular Biochemistry
Volume63
Issue numberSUPPL. 25
DOIs
StatePublished - Dec 1 1996

Keywords

  • acquired risk
  • chemoprevention
  • colon
  • genetic risk
  • neoplasia

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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