Dietary antioxidant micronutrients alter mucosal inflammatory risk in a murine model of genetic and microbial susceptibility

作者：Pierre Joseph F; Hinterleitner Reinhard; Bouziat Romain; Hubert Nathan A; Leone Vanessa; Miyoshi Jun; Jabri Bana; Chang Eugene B^*

来源：Journal of Nutritional Biochemistry, 2018, 54: 95-104.

DOI：10.1016/j.jnutbio.2017.12.002

• Self-filling loops
• Pouchitis
• Inflammatory bowel disease
• Antioxidants
• Retinoic acid
• Ascorbic acid
• Ulcerative colitis

Inflammatory bowel diseases (IBD) are caused by the convergence of microbial, environmental, and genetic factors. Diet significantly alters these interactions by affecting both the host and microbiome. Using a mucosal inflammatory model that resembles the human condition of ileal pouchitis, we investigated the effects of Control (CONT) or Antioxidant (AOX) diet, containing pharmacologically relevant levels of 4 micronutrients, on disease risk in wild-type and IL-10(-/-) animals following surgical self-filling (SF) ileal blind loop placement. Although no differences were found in body weight change or survival, IL-10(-/-) CONT animals had significantly larger lymphoid organs compared with IL-10(-/-) AOX or with WT. SF loops from IL-10(-/-) CONT loop mucosa demonstrated histological inflammation, characterized by goblet cell depletion, increased mucosal myeloperoxidase (MPO), and elevated IFN gamma, TNF alpha, and IL-17 alpha gene expression, which AOX attenuated. AOX elevated luminal IgA in IL-10(-/-) animals, but not significantly in WT. In IL-10(-/-) animals, AOX significantly decreased the percentage of CD4 + T-bet and CD4 + ROR gamma T-cells compared with CONT, with no changes in CD4 + Foxp3+ Treg cells. 16S rRNA gene sequencing demonstrated AOX increased microbial alpha diversity compared with CONT in both genotypes. Notably, colonizing germ-free IL-10(-/-) hosts with CONT bacterial communities, but not AOX, recapitulated the inflammatory phenotype. Collectively, these findings highlight that common dietary antioxidant micronutrients reshape the gut microbial community to mitigate intestinal inflammatory profiles in genetically susceptible hosts. Insights into the dietary-immune-microbial nexus may improve understanding for recurrent inflammatory episodes in susceptible patient populations and opportunities for practical therapeutics to restore immune and microbial homeostasis.

• 出版日期2018-4