Cited by 307Genomics, phytochemicals, and oxidative stressInflammatory Bowel DiseaseBioactive Compounds and Antitumor Agents

Increased susceptibility of Nrf2 knockout mice to colitis-associated colorectal cancer

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Khor, Tin Oo, Huang, Mou-Tuan, Prawan, Auemduan, Liu, Yue, Hao, Xingpei, Yu, Siwang, Cheung, William Ka Lung, Chan, Jefferson Y. +3 more·2008·Cancer Prevention Research

Published version of a preprint

Abstract

The nuclear factor-erythroid 2-related factor 2 (Nrf2) plays a critical role in protecting various tissues against inflammation, which is a potential risk factor for colorectal and other cancers. Our previously published mouse model work showed that Nrf2 helps protect against dextran sulfate sodium (DSS)-induced colitis/inflammation, and others have shown that Nrf2 helps protect against inflammation-associated colorectal carcinogenesis (aberrant crypt foci). The present study extended these important earlier findings by exploring the role of Nrf2 in colitis-associated colorectal cancer in a mouse model involving azoxymethane/DSS-induced colorectal carcinogenesis in Nrf2 knockout mice. Azoxymethane/DSS-treated Nrf2 knockout mice had increased incidence, multiplicity, and size of all colorectal tumors, including adenomas, versus treated wild-type (WT) mice, and the proportion of tumors that were adenocarcinoma was much higher in knockout (80%) versus WT (29%) mice. Compared with WT mice, knockout mice also had increased markers of inflammation in tumor tissue (cyclooxygenase-2 and 5-lipoxygenase expressions and prostaglandin E(2) and leukotriene B(4) levels) and in inflamed colonic mucosa (nitrotyrosine expression), supporting the association of knockout mouse tumor formation with inflammation. The phase II detoxifying/antioxidant enzymes NAD(P)H-quinone reductase 1 and UDP-glucurosyltransferase 1A1 were elevated in the normal mucosa of WT, but not Nrf 2 knockout, mice treated with azoxymethane/DSS. Our findings show that Nrf2 plays a critical role in protecting against inflammation-associated colorectal cancer.

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Crossref · 10.1158/1940-6207.capr-08-0028

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  • Tissue and plasma from Nrf2KO mice present higher levels of inflammation at 4 months of age.

    “Our data show that tissue and plasma from Nrf2KO mice present higher levels of inflammation at 4 month of age (measured by the cytokine levels), corroborating previous reports (Ishii et al., 2005; Khor et al., 2008).”

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Authors
Khor, T. O., Huang, M.-T., Prawan, A., Liu, Y., Hao, X., Yu, S., Cheung, W. K. L., Chan, J. Y., Reddy, B. S., Yang, C. S., & Kong, A.-N.
Affiliations
Rutgers, The State University of New Jersey (US)
Corresponding author
Kong, Ah-Ng
Venue
Cancer Prevention Research
Published
2008-07-25
Volume
1
Issue
3
Pages
187-191
ISSN
  • 1940-6207 (ISSN-L)
  • 1940-6215
OpenAlex
W2141004419
Cited by
306
References
22
Citations by year
2026: 6 · 2025: 9 · 2024: 9 · 2023: 17 · 2022: 18 · 2021: 10 · 2020: 23 · 2019: 28 · 2018: 21 · 2017: 34 · 2016: 22 · 2015: 22 · 2014: 18 · 2013: 16 · 2012: 16
FWCI
5.07
Type
journal article
Language
en
Open access
Locations
  • Cancer Prevention Research (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Cancer Institute (R01CA073674)
  • National Institute of Environmental Health Sciences (P30ES005022)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics, phytochemicals, and oxidative stress
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Inflammatory Bowel Disease
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Toxicology › Bioactive Compounds and Antitumor Agents
Keywords
Nrf2, colitis-associated colorectal cancer, Nrf2 knockout mice, inflammation-associated carcinogenesis, colorectal adenoma, cyclooxygenase-2, 5-lipoxygenase, prostaglandin E2, leukotriene B4, nitrotyrosine, UDP-glucuronosyltransferase 1A1, phase II enzymes, antioxidant defense
MeSH terms
Adenocarcinoma, Adenoma, Animals, Azoxymethane, Colitis, Male, Mice, Inbred C57BL, Colorectal Neoplasms, Gene Expression Regulation, Neoplastic, Dextran Sulfate, Mice, Knockout, Cytoprotection, Genetic Predisposition to Disease, NF-E2-Related Factor 2, Mice, Cyclooxygenase 2

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