CRTH2 plays an essential role in the pathophysiology of Cry j 1-induced pollinosis in mice

Rie Nomiya, Mitsuhiro Okano, Tazuko Fujiwara, Megumi Maeda, Yoshinobu Kimura, Kosuke Kino, Minehiko Yokoyama, Hiroyuki Hirai, Kinya Nagata, Toshifumi Hara, Kazunori Nishizaki, Masataka Nakamura

Research output: Contribution to journalArticlepeer-review

55 Citations (Scopus)


PGD2 is the major prostanoid produced during the acute phase of allergic reactions. Two PGD2 receptors have been isolated, DP and CRTH2 (chemoattractant receptor-homologous molecule expressed on Th2 cells), but whether they participate in the pathophysiology of allergic diseases remains unclear. We investigated the role of CRTH2 in the initiation of allergic rhinitis in mice. First, we developed a novel murine model of pollinosis, a type of seasonal allergic rhinitis. Additionally, pathophysiological differences in the pollinosis were compared between wild-type and CRTH2 gene-deficient mice. An effect of treatment with ramatroban, a CRTH2/T-prostanoid receptor dual antagonist, was also determined. Repeated intranasal sensitization with Cry j 1, the major allergen of Cryptomeria japonica pollen, in the absence of adjuvants significantly exacerbated nasal hyperresponsive symptoms, Cry j 1-specific IgE and IgGl production, nasal eosinophilia, and Cry j 1-induced in vitro production of IL-4 and IL-5 by submandibular lymph node cells. Additionally, CRTH2 mRNA in nasal mucosa was significantly elevated in Cry j 1-sensitized mice. Following repeated intranasal sensitization with Cry j 1, CRTH2 gene-deficient mice had significantly weaker Cry j 1-specific IgE/IgGl production, nasal eosinophilia, and IL-4 production by submandibular lymph node cells than did wild-type mice. Similar results were found in mice treated with ramatroban. These results suggest that the PGD2-CRTH2 interaction is elevated following sensitization and plays a proinflammatory role in the pathophysiology of allergic rhinitis, especially pollinosis in mice. The Journal of Immunology, 2008, 180: 5680-5688.

Original languageEnglish
Pages (from-to)5680-5688
Number of pages9
JournalJournal of Immunology
Issue number8
Publication statusPublished - Apr 15 2008

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology


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