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- W4382310435 abstract "Proteinase-activated receptors (PARs, nomenclature as agreed by the NC-IUPHAR Subcommittee on Proteinase-activated Receptors [39]) are unique members of the GPCR superfamily activated by proteolytic cleavage of their amino terminal exodomains. Agonist proteinase-induced hydrolysis unmasks a tethered ligand (TL) at the exposed amino terminus, which acts intramolecularly at the binding site in the body of the receptor to effect transmembrane signalling. TL sequences at human PAR1-4 are SFLLRN-NH2, SLIGKV-NH2, TFRGAP-NH2 and GYPGQV-NH2, respectively. With the exception of PAR3, synthetic peptides with these sequences (as carboxyl terminal amides) are able to act as agonists at their respective receptors. Several proteinases, including neutrophil elastase, cathepsin G and chymotrypsin can have inhibitory effects at PAR1 and PAR2 such that they cleave the exodomain of the receptor without inducing activation of Gαq-coupled calcium signalling, thereby preventing activation by activating proteinases but not by agonist peptides. Neutrophil elastase (NE) cleavage of PAR1 and PAR2 can however activate MAP kinase signaling by exposing a TL that is different from the one revealed by trypsin [87]. PAR2 activation by NE regulates inflammation and pain responses [115, 76] and triggers mucin secretion from airway epithelial cells [116]." @default.
- W4382310435 created "2023-06-28" @default.
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- W4382310435 date "2023-04-26" @default.
- W4382310435 modified "2023-09-25" @default.
- W4382310435 title "Proteinase-activated receptors in GtoPdb v.2023.1" @default.
- W4382310435 doi "https://doi.org/10.2218/gtopdb/f59/2023.1" @default.
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