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• W2121900331 endingPage "1293.e10" @default.
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• W2121900331 abstract "BackgroundAirway tolerance is critical for protecting the lung from inflammatory disease driven by allergens. However, factors that disrupt tolerance processes and then lead to susceptibility to developing allergic asthma remain elusive.ObjectiveTo investigate whether recognition of bacterial microbial-associated molecular patterns in the lung may result in susceptibility to developing allergic reactions, and to understand the molecular mechanisms by which such triggers block natural tolerance.MethodsLigands of intracellular microbial-associated molecular pattern recognition receptors—the nucleotide-binding oligomerization domain (Nod)-like receptors, Nod1 and Nod2—were given intranasally with antigen, and their ability to modulate airway tolerance was analyzed.ResultsIntranasal Nod2 ligand rapidly induced lung expression of the innate cytokines thymic stromal lymphopoietin and IL-25, and thymic stromal lymphopoietin promoted expression of OX40 ligand, a T-cell–costimulatory ligand, on lung CD11c+CD11b+ cells and B220+ cells. Together these 3 molecules blocked the generation of antigen-specific CD4+forkhead box protein 3+ adaptive regulatory T cells and concomitantly drove IL-4–producing CD4 T cells. By altering the regulatory T/TH2–cell balance, tolerance was blocked, and sensing of Nod2 ligand resulted in subsequent susceptibility to developing eosinophil-dominated airway inflammation.ConclusionWe show that a Nod-like receptor is a novel, previously unrecognized, pathway that adversely links innate and adaptive immunity and leads to allergic disease and asthmatic lung inflammation. Airway tolerance is critical for protecting the lung from inflammatory disease driven by allergens. However, factors that disrupt tolerance processes and then lead to susceptibility to developing allergic asthma remain elusive. To investigate whether recognition of bacterial microbial-associated molecular patterns in the lung may result in susceptibility to developing allergic reactions, and to understand the molecular mechanisms by which such triggers block natural tolerance. Ligands of intracellular microbial-associated molecular pattern recognition receptors—the nucleotide-binding oligomerization domain (Nod)-like receptors, Nod1 and Nod2—were given intranasally with antigen, and their ability to modulate airway tolerance was analyzed. Intranasal Nod2 ligand rapidly induced lung expression of the innate cytokines thymic stromal lymphopoietin and IL-25, and thymic stromal lymphopoietin promoted expression of OX40 ligand, a T-cell–costimulatory ligand, on lung CD11c+CD11b+ cells and B220+ cells. Together these 3 molecules blocked the generation of antigen-specific CD4+forkhead box protein 3+ adaptive regulatory T cells and concomitantly drove IL-4–producing CD4 T cells. By altering the regulatory T/TH2–cell balance, tolerance was blocked, and sensing of Nod2 ligand resulted in subsequent susceptibility to developing eosinophil-dominated airway inflammation. We show that a Nod-like receptor is a novel, previously unrecognized, pathway that adversely links innate and adaptive immunity and leads to allergic disease and asthmatic lung inflammation." @default.
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• W2121900331 date "2010-12-01" @default.
• W2121900331 modified "2023-10-16" @default.
• W2121900331 title "Innate signals from Nod2 block respiratory tolerance and program TH2-driven allergic inflammation" @default.
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• W2121900331 doi "https://doi.org/10.1016/j.jaci.2010.09.021" @default.
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