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Related Experiment Video

Updated: Jun 9, 2026

Modeling Colitis-Associated Cancer with Azoxymethane AOM and Dextran Sulfate Sodium DSS
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Oxidized Polyunsaturated Fatty Acid Promotes Colitis and Colitis-Associated Tumorigenesis in Mice.

Weicang Wang1,2, Yuxin Wang1,2, Katherine Z Sanidad1,3,4,5

  • 1Department of Food Science, University of Massachusetts, Amherst, MA, USA.

Journal of Crohn'S & Colitis
|September 16, 2024
PubMed
Summary

Oxidized polyunsaturated fatty acids (PUFA) worsen inflammatory bowel disease (IBD) and associated colon cancer in mice by affecting gut microbiota and Toll-like receptor 4 (TLR4) signaling. Unoxidized PUFA did not promote colitis.

Keywords:
Polyunsaturated fatty acidcolitiscolitis-associated tumorigenesislipid oxidation

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Area of Science:

  • Gastroenterology
  • Nutrition Science
  • Cancer Research

Background:

  • Human studies link high polyunsaturated fatty acid (PUFA) intake to increased inflammatory bowel disease (IBD) risk.
  • The role of oxidized versus unoxidized PUFA in IBD development remains unclear.
  • PUFAs are susceptible to oxidation, raising questions about their impact on gut health.

Purpose of the Study:

  • To compare the effects of oxidized and unoxidized PUFA on IBD development.
  • To investigate the role of oxidized PUFA in colitis-associated colorectal cancer.
  • To elucidate the involvement of gut microbiota and Toll-like receptor 4 (TLR4) signaling.

Main Methods:

  • Utilized mouse models for dextran sodium sulfate (DSS)-induced and IL-10 knockout-induced colitis.
  • Assessed azoxymethane/DSS-induced colon tumorigenesis in mice fed diets with oxidized or unoxidized PUFA.
  • Investigated the roles of gut microbiota and TLR4 signaling in PUFA-induced effects.

Main Results:

  • Oxidized PUFA exacerbated colitis severity and associated colon tumorigenesis in mice.
  • Unoxidized PUFA did not promote colitis.
  • Oxidized PUFA worsened intestinal barrier dysfunction, increased bacterial translocation, and its effects were dependent on TLR4 and gut microbiota.

Conclusions:

  • Oxidized PUFA promotes colitis and tumorigenesis in mice through TLR4 and gut microbiota-dependent pathways.
  • Findings suggest a need to reassess food industry standards and regulations for oxidized PUFA.
  • Differentiating between oxidized and unoxidized PUFA is crucial for understanding IBD and cancer risks.