Accumulation of CRTH2-positive leukocytes in human allergic nasal mucosa.
BACKGROUND
Prostaglandin D2 (PGD2) has been thought to be a potent mediator involved in allergic rhinitis because PGD2 has been recovered from the nasal lavage fluid of patients with allergic rhinitis after allergen provocation and because PGD2 receptor antagonists relieved nasal allergic symptoms in an animal model of allergic rhinitis. The inflammatory effects of PGD2 are exerted through high-affinity interactions with 2 G protein-coupled receptors: D-prostanoid receptor 1 and chemoattractant-homologous receptor expressed on TH2 cells (CRTH2). CRTH2 may mediate the recruitment of leukocytes during a nasal allergic response.


OBJECTIVE
To evaluate the number of CRTH2-expressing cells in allergic and nonallergic human nasal mucosa by means of immunohistochemical analysis.


METHODS
Human turbinates were obtained after turbinectomy from 14 patients with nasal obstruction refractory to medical therapy. To identify cells expressing the CRTH2 protein, double immunostaining was performed using anti-CRTH2 antibody and monoclonal anti-leukocyte antibodies.


RESULTS
The immunohistochemical study revealed that anti-CRTH2 antibody labeled eosinophils, macrophages, mast cells, T lymphocytes, epithelial cells, and submucosal glands in the nasal mucosa. CRTH2 expressions of these leukocytes in allergic nasal mucosa are significantly up-regulated compared with those in nonallergic nasal mucosa.


CONCLUSIONS
These results suggest that CRTH2 may play an important role in the recruitment of leukocytes into allergic nasal mucosa.
Shirasaki
Hideaki
H
Department of Otolaryngology, Sapporo Medical University, School of Medicine, Sapporo, Japan. shira@sapmed.ac.jp
Kikuchi
Megumi
M
Kanaizumi
Etsuko
E
Himi
Tetsuo
T
D000328:Adult; D002478:Cells, Cultured; D002634:Chemotaxis, Leukocyte; D004804:Eosinophils / Q000276:immunology; D005260:Female; D005786:Gene Expression Regulation; D006801:Humans; D007150:Immunohistochemistry; D008264:Macrophages / Q000276:immunology; D008297:Male; D008407:Mast Cells / Q000276:immunology; D008875:Middle Aged; D009297:Nasal Mucosa / Q000276:immunology*; D011971:Receptors, Immunologic / Q000276:immunology*; D011982:Receptors, Prostaglandin / Q000276:immunology*; D018418:Th2 Cells / Q000276:immunology*; D055815:Young Adult
D011971:Receptors, Immunologic; D011982:Receptors, Prostaglandin; C036293:prostaglandin D2 receptor