Colitis and colitis-associated cancer are exacerbated in mice deficient for tumor protein 53-induced nuclear protein 1.

Abstract

Tumor protein 53-induced nuclear protein 1 (TP53INP1) is an antiproliferative and proapoptotic protein involved in cell stress response. To address its physiological roles in colorectal cancer and colitis, we generated and tested the susceptibility of Trp53inp1-deficient mice to the development of colorectal tumors induced by injection of the carcinogen azoxymethane followed by dextran sulfate sodium (DSS)-induced chronic colitis. Trp53inp1-deficient mice showed an increased incidence and multiplicity of tumors compared to those of wild-type (WT) mice. Furthermore, acute colitis induced by DSS treatment was more severe in Trp53inp1-deficient mice than in WT mice. Treatment with the antioxidant N-acetylcysteine prevented colitis and colitis-associated tumorigenesis more efficiently in WT mice than in Trp53inp1-deficient mice, suggesting a higher oxidative load in the latter. Consistently, we demonstrated by electron spin resonance and spin trapping that colons derived from deficient mice produced more free radicals than those of the WT during colitis and that the basal blood level of the antioxidant ascorbate was decreased in Trp53inp1-deficient mice. Collectively, these results indicate that the oxidative load is higher in Trp53inp1-deficient mice than in WT mice, generating a more-severe DSS-induced colitis, which favors development of colorectal tumors in Trp53inp1-deficient mice. Therefore, TP53INP1 is a potential target for the prevention of colorectal cancer in patients with inflammatory bowel disease.

• Authors: Julien Gommeaux, Carla Cano, Stéphane Garcia, Meritxell Gironella, Sylvia Pietri, Marcel Culcasi, Marie-Josèphe Pébusque, Bernard Malissen, Nelson Dusetti, Juan Iovanna, Alice Carrier
• Journal: Molecular and cellular biology (Mol Cell Biol) Vol. 27 Issue 6 Pg. 2215-28 (Mar 2007) ISSN: 0270-7306 [Print] United States
• PMID: 17242209 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Carrier Proteins
• NF-kappa B
• Nuclear Proteins
• Reactive Oxygen Species
• tumor protein 53-induced nuclear protein 1, mouse
• Dextran Sulfate

Topics

• Acute Disease
• Animals
• Carrier Proteins (genetics, metabolism)
• Cell Transformation, Neoplastic (genetics, metabolism, pathology)
• Chronic Disease
• Colitis (complications, genetics, metabolism, pathology)
• Colonic Neoplasms (complications, genetics, metabolism, pathology)
• Dextran Sulfate (pharmacology)
• Lipid Peroxidation
• Mice
• Mice, Knockout
• Mutation (genetics)
• NF-kappa B (metabolism)
• Nuclear Proteins (genetics, metabolism)
• Oxidative Stress
• Reactive Oxygen Species