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pubmed-article:19050285pubmed:abstractTextRespiratory exposure to allergens can lead to airway tolerance. Factors that antagonize tolerance mechanisms in the lung might result in susceptibility to diseases such as asthma. We show that inhalation of endotoxin/LPS with Ag prevented airway tolerance and abolished protection from T cell-driven asthmatic lung inflammation. Under conditions leading to tolerance, adaptive Ag-specific CD4(+)Foxp3(+) T regulatory cells (Treg) were generated following exposure to intranasal Ag and outnumbered IL-4- and IFN-gamma-producing CD4 T cells by 100:1 or greater. Inhaled LPS altered the ratio of Treg to IL-4(+) or IFN-gamma(+) T cells by concomitantly suppressing Treg generation and promoting effector T cell generation. LPS induced OX40L expression on dendritic cells and B cells that resulted in a synergistic activity between TLR4 and OX40 signals, leading to production of IL-4, IFN-gamma, and IL-6, which blocked Treg development. Furthermore, inhibiting OX40/OX40L interactions prevented LPS from suppressing tolerance, and resulted in the generation of greater numbers of adaptive Treg. Thus, cooperation between TLR4 and OX40 controls susceptibility to developing airway disease via modulating the balance between adaptive Treg and IL-4(+) or IFN-gamma(+) T cells. Targeting OX40L then has the potential to improve the efficacy of Ag immunotherapy to promote tolerance.lld:pubmed
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