Cell Reports
Volume 15, Issue 12, 21 June 2016, Pages 2809-2824
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Article
Dietary Fiber and Bacterial SCFA Enhance Oral Tolerance and Protect against Food Allergy through Diverse Cellular Pathways

https://doi.org/10.1016/j.celrep.2016.05.047Get rights and content
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Highlights

  • Dietary fiber with vitamin A increases the potency of tolerogenic CD103+ DCs

  • High-fiber diet protects mice against peanut allergy via gut microbiota and SCFA

  • High-fiber effects rely on epithelial GPR43 and immune cell GPR109a

  • Dietary fiber promotes TFH and IgA responses

Summary

The incidence of food allergies in western countries has increased dramatically in recent decades. Tolerance to food antigens relies on mucosal CD103+ dendritic cells (DCs), which promote differentiation of regulatory T (Treg) cells. We show that high-fiber feeding in mice improved oral tolerance and protected from food allergy. High-fiber feeding reshaped gut microbial ecology and increased the release of short-chain fatty acids (SCFAs), particularly acetate and butyrate. High-fiber feeding enhanced oral tolerance and protected against food allergy by enhancing retinal dehydrogenase activity in CD103+ DC. This protection depended on vitamin A in the diet. This feeding regimen also boosted IgA production and enhanced T follicular helper and mucosal germinal center responses. Mice lacking GPR43 or GPR109A, receptors for SCFAs, showed exacerbated food allergy and fewer CD103+ DCs. Dietary elements, including fiber and vitamin A, therefore regulate numerous protective pathways in the gastrointestinal tract, necessary for immune non-responsiveness to food antigens.

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