COX-1 mediates IL-33-induced extracellular signal-regulated kinase activation in mast cells: Implications for aspirin sensitivity

JOURNAL OF ALLERGY AND CLINICAL IMMUNOLOGY

卷:143

Article

Pan, Dingxin^1,2  Buchheit, Kathleen M.^1,2  Samuchiwal, Sachin K.^1,2  Liu, Tao^1,2  Cirka, Haley²  Raff, Hannah²  Boyce, Joshua A.^1,2 

[1] Harvard Med Sch, Dept Med, Boston, MA 02115 USA

[2] Brigham & Womens Hosp, Div Rheumatol Immunol & Allergy, 75 Francis St, Boston, MA 02115 USA

关键词: Eicosanoids;    mast cells;    IL-33;    aspirin-exacerbated respiratory disease;    cyclooxygenase asthma;   

DOI  :  10.1016/j.jaci.2018.06.033

来源: Elsevier

【 摘 要 】

Background: Classical Fc epsilon RI-induced mast cell (MC) activation causes synthesis of arachidonic acid (AA)-derived eicosanoids (leukotriene [LT] C-4, prostaglandin [PG] D-2, and thromboxane A(2)), 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. Objectives: 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. Methods: 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). Results: IL-33 potently liberates AA and elicits LTC4, PGD(2), and thromboxane A(2) 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 FceRI-driven CysLT production. Inhibition of COX-1 prevented IL-33-induced phosphorylation of extracellular signal-related kinase, an upstream effector of cytosolic phospholipase A(2), 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 PGD(2) and LTC4 in a model of AERD in which MC activation is IL-33 driven. Conclusions: 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.

【 授权许可】

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