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- W2051904687 abstract "We characterized the tracheal and bronchial relaxation caused by proteinase-activated receptor-2 (PAR-2) activation in ddY mice and/or in wild-type and PAR-2-knockout mice of C57BL/6 background. Ser-Leu-Ile-Gly-Arg-Leu-amide (SLIGRL-NH<sub>2</sub>) and Thr-Phe-Leu-Leu-Arg-amide, PAR-2- and PAR-1-activating peptides, respectively, caused relaxation in the isolated ddY mouse trachea and main bronchus. The relaxation was abolished by specific inhibitors of cyclooxygenase (COX)-1, COX-2, mitogen-activated protein kinase kinase (MEK), and p38 MAP kinase. The MEK and p38 MAP kinase inhibitors did not affect prostaglandin E<sub>2</sub>-induced relaxation. Inhibitors of cytosolic Ca<sup>2+</sup>-dependent phospholipase A<sub>2</sub> (PLA), Ca<sup>2+</sup>-independent PLA<sub>2</sub>, diacylglycerol lipase, tyrosine kinase, and protein kinase C exhibited no or only minor inhibitory effects on the PAR-mediated relaxation. Trypsin, a PAR-2 activator, and 2-furoyl-Leu-Ile-Gly-Arg-Leu-amide, a potent PAR-2-activating peptide, in addition to SLIGRL-NH<sub>2</sub>, caused airway relaxation in wild-type C57BL/6 mice, as in ddY mice. In PAR-2-knockout mice, the peptide effects were absent and the potency of trypsin decreased. Desensitization of PAR-2 and/or PAR-1greatly suppressed the relaxant effect of trypsin. The bronchial and tracheal tissues displayed distinct sensitivities toward trypsin and the PAR-2-activating peptides. Our data indicate an involvement of both COX-1 and COX-2, and the MEK-extracellular signal-regulated kinase and p38 MAP kinase signaling pathways in the PAR-2- and PAR-1-triggered relaxation of mouse airway tissue, and substantiate a role for PAR-2 in regulating both the trachea and bronchial responsiveness in the mouse lung." @default.
- W2051904687 created "2016-06-24" @default.
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- W2051904687 date "2004-06-15" @default.
- W2051904687 modified "2023-10-14" @default.
- W2051904687 title "Proteinase-Activated Receptor-2-Mediated Relaxation in Mouse Tracheal and Bronchial Smooth Muscle: Signal Transduction Mechanisms and Distinct Agonist Sensitivity" @default.
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- W2051904687 doi "https://doi.org/10.1124/jpet.104.068387" @default.
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