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International Immunology Advance Access originally published online on June 1, 2004
International Immunology 2004 16(7):947-959; doi:10.1093/intimm/dxh096
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International Immunology, Vol. 16, No. 7, pp. 947-959, July 2004
© 2004 Japanese Society for Immunology

CRTH2 is a prominent effector in contact hypersensitivity-induced neutrophil inflammation

Keisuke Takeshita, Tsugiko Yamasaki, Koichi Nagao, Hiromi Sugimoto, Michitaka Shichijo, Florian Gantner and Kevin B. Bacon

Bayer Yakuhin, Ltd., Research Center Kyoto, Respiratory Disease Research, 6-5-1-3, Kunimidai, Kizu-cho, Soraku-gun, 619-0216 Kyoto, Japan

Correspondence to: K. B. Bacon; Email: kevin.bacon.kb{at}bayer.co.jp
Transmitting editor: K. Inaba

Chemoattractant receptor-homologous molecule expressed on Th2 lymphocytes, CRTH2, is a cognate receptor for prostaglandin (PG) D2 and, in humans, is suggested to play a functional role in Th2-dependent allergic inflammation. While peripheral blood leukocytes expressing high levels of surface CRTH2 have been detected in disease, little is known of the functional significance of CRTH2 in disease etiology. We have utilized a Th2-dependent murine model of FITC-induced contact hypersensitivity to assess the role, if any, CRTH2-PGD2 may play in the elicitation or maintenance of such pathobiology. Expression of both PGD2 and CRTH2 in lesional skin was paralleled by the release of the chemoattractants LTB4 and the chemokine KC, as well as a profuse dermal neutrophilic and eosinophilic infiltrate, closely paralleling the acute inflammatory pathology observed in human atopic dermatitis. A small molecule CRTH2 antagonist, but not a selective PGD2R (DP) receptor antagonist, was able to completely abrogate these responses. Inflammatory cascades mediated by CRTH2 ligation may therefore represent an important early step in the elicitation and maintenance of Th2-dependent skin inflammation.

Keywords: chemokines, hypersensitivity, inflammation, leukocytes, prostanoids, skin


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