Genome-wide analysis of dietary eicosapentaenoic acid- and oleic acid-induced modulation of colon inflammation in interleukin-10 gene-deficient mice.
OBJECTIVE
Dietary n-3 polyunsaturated fatty acids can reduce inflammation via a range of mechanisms. This study tested the effect of dietary eicosapentaenoic acid (EPA) on intestinal inflammation using interleukin-10 gene-deficient (Il10(-/-)) mice.


METHODS
At 35 days of age, 12 weaned Il10(-/-) and 12 C57 mice were randomly assigned to one of two modified AIN-76A diets, supplemented with 3.7% purified ethyl esters of either EPA (n-3) or oleic acid (OA, control). To identify genes relevant to colon inflammation, transcription profiling (microarrays and qRT-PCR) and bioinformatic analyses were used.


RESULTS
In this study, dietary EPA reversed the decrease in colon fatty acid beta-oxidation gene expression observed in OA-fed Il10(-/-) compared to C57 mice. Il10(-/-) mice fed the OA diet showed decreased expression of antioxidant enzyme genes, as well as those involved in detoxification of xenobiotics, compared to C57 mice on the same diet. In contrast, dietary EPA increased the expression of these genes in Il10(-/-) mice.


CONCLUSIONS
These data indicate that dietary EPA-induced endogenous lipid oxidation which might have a potential anti-inflammatory effect on colon tissue. This is supported by the activation of the Ppara gene that regulates the expression of pro-inflammatory and immunomodulatory genes and proteins.
Food, Metabolism & Microbiology Section, Food & Textiles Group, AgResearch Grasslands, Palmerston North, New Zealand.
Bianca
B
Knoch
Matthew P G
MP
Barnett
Shuotun
S
Zhu
Zaneta A
ZA
Park
Katia
K
Nones
Yvonne E M
YE
Dommels
Scott O
SO
Knowles
Warren C
WC
McNabb
Nicole C
NC
Roy
D000818:Animals; D001835:Body Weight / Q000187:drug effects / Q000235:genetics / Q000502:physiology; D003092:Colitis / Q000139:chemically induced* / Q000235:genetics*; D004042:Dietary Fats, Unsaturated / Q000009:adverse effects; D004435:Eating / Q000187:drug effects / Q000235:genetics / Q000502:physiology; D015118:Eicosapentaenoic Acid / Q000009:adverse effects*; D020869:Gene Expression Profiling; D053263:Gene Regulatory Networks; D055106:Genome-Wide Association Study; D016753:Interleukin-10 / Q000235:genetics*; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D008954:Models, Biological; D019301:Oleic Acid / Q000009:adverse effects*; D020411:Oligonucleotide Array Sequence Analysis; D000685:Serum Amyloid A Protein / Q000032:analysis
D004042:Dietary Fats, Unsaturated; D000685:Serum Amyloid A Protein; D016753:Interleukin-10; D019301:Oleic Acid; D015118:Eicosapentaenoic Acid