BLT2 is upregulated in allergen-stimulated mast cells and mediates the synthesis of Th2 cytokines

Kyung Jin Cho, Ji Min Seo, Min Goo Lee, Jae Hong Kim

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)


Mast cells are effector cells that mediate the allergic response through Ag stimulation of IgE bound to FcεRI. In allergic reactions, cross-linking of the surface receptors for IgE on mast cells results in the synthesis of Th2 cytokines such as IL-4 and IL-13, which are critical for the initiation and progression of the allergic response. Despite the important roles of these cytokines, the signaling mechanism by which Ag stimulation mediates the production of IL-4 and IL-13 in mast cells is not clearly understood. In the present study, we found that Ag-stimulated bone marrow-derived mast cells (BMMCs) highly upregulated the expression of BLT2, a leukotriene B4 receptor, and that blockade of BLT2 with the specific antagonist LY255283 or small interfering RNA knockdown completely abolished the production of Th2 cytokines. Furthermore, BMMCs overexpressing BLT2 showed significantly enhanced production of Th2 cytokines compared with wild-type BMMCs. Additionally, we found that the generation of Nox1-derived reactive oxygen species occurs downstream of BLT2, thus mediating the synthesis of Th2 cytokines. Taken together, our results suggest that the BLT2-Nox1-reactive oxygen species cascade is a previously unsuspected mediatory signaling mechanism to Th2 cytokine production in Ag-stimulated BMMCs, thus contributing to allergic response.

Original languageEnglish
Pages (from-to)6329-6337
Number of pages9
JournalJournal of Immunology
Issue number10
Publication statusPublished - 2010 Nov 15

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology


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