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Avail Biomedical Research Institute, Basel, Switzerland
The respiratory epithelium represents the first barrier encountered by airborne Ags. Two major dust mite Ags, Der p3 and Der p9, are serine proteases that may activate lung epithelial cells by interaction with the protease-activated receptor 2 (PAR-2). In this study both Der p3 and Der p9 cleaved the peptide corresponding to the N terminus of PAR-2 at the activation site. Both Ags sequentially stimulated phosphoinositide hydrolysis, transient cytosolic Ca2+ mobilization, and release of GM-CSF and eotaxin in human pulmonary epithelial cells. These responses were similar to those observed with trypsin and a specific PAR-2 agonist and were related to the serine protease activity of Der p3 and Der p9. Cell exposure to the Ags resulted in a refractory period, indicating that a PAR had been cleaved. Partial desensitization to Der p3 and Der p9 by the PAR-2 agonist suggested that PAR-2 was one target of the Ags. However, PAR-2 was not the only target, because the PAR-2 agonist caused less desensitization to Der p3 and Der p9 than did trypsin. A phospholipase C inhibitor prevented the cytokine-releasing effect of the PAR-2 agonist and abolished or reduced (>70%) the cytokine-releasing effects of Der p3 and Der p9. Our results suggest that Der p 3 and Der p9 may induce a nonallergic inflammatory response in the airways through the release of proinflammatory cytokines from the bronchial epithelium and that this effect is at least in part mediated by PAR-2.
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