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The Journal of Immunology, 2004, 172: 6978-6987.
Copyright © 2004 by The American Association of Immunologists

Toll-Like Receptor 4 Signaling by Intestinal Microbes Influences Susceptibility to Food Allergy1

Mohamed Elfatih H. Bashir, Steve Louie, Hai Ning Shi and Cathryn Nagler-Anderson2

Mucosal Immunology Laboratory, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA 02129

The mechanisms by which signaling by the innate immune system controls susceptibility to allergy are poorly understood. In this report, we show that intragastric administration of a food allergen with a mucosal adjuvant induces allergen-specific IgE, elevated plasma histamine levels, and anaphylactic symptoms in three different strains of mice lacking a functional receptor for bacterial LPS (Toll-like receptor 4 (TLR4)), but not in MHC-matched or congenic controls. Susceptibility to allergy correlates with a Th2-biased cytokine response in both the mucosal (mesenteric lymph node and Peyer’s patch) and systemic (spleen) tissues of TLR4-mutant or -deficient mice. TLR4-mutant mice are not inherently impaired in their ability to regulate Th1 cytokine production because they respond to stimulation via TLR9. Coadministration of CpG oligodeoxynucleotides during sensitization of TLR4-mutant mice with allergen plus CT abrogates anaphylactic symptoms and Ag-specific IgE, and results in a Th1-polarized cytokine response. When the composition of the bacterial flora is reduced and altered by antibiotic administration (beginning at 2 wk of age), TLR4 wild-type mice become as susceptible to the induction of allergy as their TLR4-mutant counterparts. Both allergen-specific IgE and Th2 cytokine responses are reduced in antibiotic-treated mice in which the flora has been allowed to repopulate. Taken together, our results suggest that TLR4-dependent signals provided by the intestinal commensal flora inhibit the development of allergic responses to food Ags.




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