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Am J Physiol Gastrointest Liver Physiol. 2016 Jun 1;310(11):G906-19. doi: 10.1152/ajpgi.00345.2015. Epub 2016 Mar 31.

High-fat diets rich in saturated fat protect against azoxymethane/dextran sulfate sodium-induced colon cancer.

Author information

1
Department of Pathology, Microbiology & Immunology, School of Medicine, University of South Carolina, Columbia, South Carolina; and.
2
Department of Exercise Science, University of South Carolina, Columbia, South Carolina.
3
Department of Pathology, Microbiology & Immunology, School of Medicine, University of South Carolina, Columbia, South Carolina; and Angela.Murphy@uscmed.sc.edu.

Abstract

High-fat-diet (HFD) consumption is associated with colon cancer risk. However, little is known about how the lipid composition of a HFD can influence prooncogenic processes. We examined the effects of three HFDs differing in the percentage of total calories from saturated fat (SF) (6, 12, and 24% of total caloric intake), but identical in total fat (40%), and a commercially available Western diet (26 and 41% saturated and total fat, respectively) on colon cancer development using the azoxymethane (AOM)/dextran sulfate sodium (DSS) murine model. A second dose-response experiment was performed using diets supplemented with the saturated-fatty-acid (SFA)-rich coconut oil. In experiment 1, we found an inverse association between SF content and tumor burden. Furthermore, increased SF content was associated with reduced inflammation, increased apoptosis, and decreased proliferation. The second dose-response experiment was performed to test whether this effect may be attributed to the SF content of the diets. Consistent with the initial experiment, we found that high SF content was protective, at least in male mice; there was a decrease in mortality in mice consuming the highest concentration of SFAs. To explore a potential mechanism for these findings, we examined colonic mucin 2 (Muc2) protein content and found that the HFDs with the highest SF content had the greatest concentration of Muc2. Our data suggest that high dietary SF is protective in the AOM/DSS model of colon cancer, which may be due, at least in part, to the ability of SF to maintain intestinal barrier integrity through increased colonic Muc2.

KEYWORDS:

high-fat diet; inflammation; mucin 2

PMID:
27033117
PMCID:
PMC4935479
DOI:
10.1152/ajpgi.00345.2015
[Indexed for MEDLINE]
Free PMC Article

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