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• W2891625845 abstract "Classical FcεRI-induced mast cell (MC) activation causes synthesis of arachidonic acid (AA)–derived eicosanoids (leukotriene [LT] C4, prostaglandin [PG] D2, and thromboxane A2), which mediate vascular leak, bronchoconstriction, and effector cell chemotaxis. Little is known about the significance and regulation of eicosanoid generation in response to nonclassical MC activation mechanisms.We sought to determine the regulation and significance of MC-derived eicosanoids synthesized in response to IL-33, a cytokine critical to innate type 2 immunity.We used an ex vivo model of mouse bone marrow–derived mast cells and an IL-33–dependent in vivo model of aspirin-exacerbated respiratory disease (AERD).IL-33 potently liberates AA and elicits LTC4, PGD2, and thromboxane A2 production by bone marrow–derived mast cells. Unexpectedly, the constitutive function of COX-1 is required for IL-33 to activate group IVa cytosolic phospholipase A2 with consequent AA release for synthesis of all eicosanoids, including CysLTs. In contrast, COX-1 was dispensable for FcεRI-driven CysLT production. Inhibition of COX-1 prevented IL-33–induced phosphorylation of extracellular signal-related kinase, an upstream effector of cytosolic phospholipase A2, which was restored by exogenous PGH2, implying that the effects of COX-1 required its catalytic function. Administration of a COX-1–selective antagonist to mice completely prevented the generation of both PGD2 and LTC4 in a model of AERD in which MC activation is IL-33 driven.MC-intrinsic COX-1 amplifies IL-33–induced activation in the setting of innate type 2 immunity and might help explain the phenomenon of therapeutic desensitization to aspirin by nonselective COX inhibitors in patients with AERD." @default.
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• W2891625845 date "2018-10-01" @default.
• W2891625845 modified "2023-10-18" @default.
• W2891625845 title "DMSO-induced drastic changes in cellular processes and epigenetic landscape in vitro" @default.
• W2891625845 doi "https://doi.org/10.1016/j.toxlet.2018.06.927" @default.
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