EP4 receptor stimulation down-regulates human eosinophil function |
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Authors: | Luschnig-Schratl Petra Sturm Eva M Konya Viktoria Philipose Sonia Marsche Gunther Fröhlich Eleonore Samberger Claudia Lang-Loidolt Doris Gattenlöhner Stefan Lippe Irmgard Th Peskar Bernhard A Schuligoi Rufina Heinemann Akos |
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Affiliation: | 1. Institute of Experimental and Clinical Pharmacology, Medical University of Graz, Universitaetsplatz 4, 8010, Graz, Austria 2. Center for Medical Research, Medical University of Graz, Graz, Austria 3. Department of Otorhinolaryngology, Medical University of Graz, Graz, Austria 4. Institute of Pathology, Medical University of Graz, Graz, Austria
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Abstract: | Accumulation of eosinophils in tissue is a hallmark of allergic inflammation. Here we observed that a selective agonist of the PGE2 receptor EP4, ONO AE1-329, potently attenuated the chemotaxis of human peripheral blood eosinophils, upregulation of the adhesion molecule CD11b and the production of reactive oxygen species. These effects were accompanied by the inhibition of cytoskeletal rearrangement and Ca2+ mobilization. The involvement of the EP4 receptor was substantiated by a selective EP4 antagonist, which reversed the inhibitory effects of PGE2 and the EP4 agonist. Selective kinase inhibitors revealed that the inhibitory effect of EP4 stimulation on eosinophil migration depended upon activation of PI 3-kinase and PKC, but not cAMP. Finally, we found that EP4 receptors are expressed by human eosinophils, and are also present on infiltrating leukocytes in inflamed human nasal mucosa. These data indicate that EP4 agonists might be a novel therapeutic option in eosinophilic diseases. |
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