Suppression of intestinal polyposis in Apcmin/+ mice by targeting the nitric oxide or poly(ADP-ribose) pathways

Jon G. Mabley, Pál Pacher, Peter Bai, Rebecca Wallace, Sunali Goonesekera, Laszlo Virag, Garry J. Southan, Csaba Szabó

    Research output: Contribution to journalArticle

    24 Scopus citations

    Abstract

    Min mice have a germ-line nonsense mutation at codon 850 of the adenomatous polyposis coli (Apc) gene. These mice spontaneously develop multiple polyps in the small and large intestine at the age of 10-12 weeks. The aim of this study was to assess the role of reactive nitrogen species and poly(ADP-ribose) synthetase in tumorogenesis. Oxidative stress was found to be increased in the mucosa of the small intestine of Apcmin/+ mice with a concomitant increase in intestinal polyposis over control mice. Pharmacological inhibition of inducible nitric oxide synthase (NOS) with guanidinoethyldisulfide (GED) or stimulation of the breakdown of the nitrogen reactive species peroxynitrite using a potent decomposition catalyst, FP 15, reduced both the intestinal tumor load and the oxidative stress associated with intestinal polyposis in Apcmin/+ mice. Surprisingly, pharmacological inhibition of poly(ADP-ribose) synthetase by the phenanthridinone derivative PJ 34 also reduced the intestinal polyposis and oxidative stress in these mice, possibly through the inhibition of induction of nitric oxide synthase. These results suggest that reactive nitrogen species particularly peroxynitrite play a pivotal role in development of intestinal polyposis and that strategies to reduce both the oxidative stress and the formation of these radical species may be potential chemopreventive approaches for colorectal cancers.

    Original languageEnglish (US)
    Pages (from-to)107-116
    Number of pages10
    JournalMutation Research - Fundamental and Molecular Mechanisms of Mutagenesis
    Volume548
    Issue number1-2
    DOIs
    StatePublished - Apr 14 2004

    Keywords

    • Apc mice
    • Nitric oxide
    • Oxidative stress
    • Peroxynitrite
    • Poly(ADP-ribose) synthetase

    ASJC Scopus subject areas

    • Molecular Biology
    • Genetics
    • Health, Toxicology and Mutagenesis

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