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• W2034717109 abstract "1 To determine the binding characteristics of a highly potent agonist for protease-activated receptor-2 (PAR2), 2-furoyl-Leu-Ile-Gly-Arg-Leu-amide (2-furoyl-LIGRL-NH(2)), whole-cell binding assays were performed utilising a radioactive ligand, [(3)H]2-furoyl-LIGRL-NH(2). 2 Specific binding of [(3)H]2-furoyl-LIGRL-NH(2) was observed in NCTC2544 cells, dependent upon PAR2 expression, and competitively displaced by the addition of unlabeled PAR2 agonists. Scatchard analysis of specific saturation binding suggested a single binding site, with K(d) of 122+/-26.1 nM and a corresponding B(max) of 180+/-6 f mol in 3.0 x 10(5) cells. 3 The relative binding affinities of a series of modified PAR2 agonist peptides obtained from competition studies paralleled their relative EC(50) values for Ca(2+) mobilisation assays, indicating improved binding affinities by substitution with 2-furoyl at the N-terminus serine. 4 Pretreatment of cells with trypsin reduced specific binding of [(3)H]2-furoyl-LIGRL-NH(2), demonstrating direct competition between the synthetic agonist peptide and the proteolytically revealed tethered ligand for the binding site of the receptor. 5 In HCT-15 cells endogenously expressing PAR2, the binding of [(3)H]2-furoyl-LIGRL-NH(2) was displaced by addition of unlabeled ligands, Ser-Leu-Ile-Gly-Lys-Val (SLIGKV-OH) or 2-furoyl-LIGRL-NH(2). The relative binding affinity of 2-furoyl-LIGRL-NH(2) to SLIGKV-OH was comparable to its relative EC(50) value for Ca(2+) mobilisation assays. 6 The binding assay was successfully performed in monolayers of PAR2 expressing NCTC2544 and human umbilical vein endothelial cells (HUVEC), in 96- and 24-well plate formats, respectively. 7 These studies indicate that [(3)H]2-furoyl-LIGRL-NH(2) binds to human PAR2 at its ligand-binding site. The use of this radioligand will be valuable for characterising chemicals that interact to PAR2." @default.
• W2034717109 created "2016-06-24" @default.
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• W2034717109 date "2005-05-01" @default.
• W2034717109 modified "2023-10-13" @default.
• W2034717109 title "Binding of a highly potent protease-activated receptor-2 (PAR2) activating peptide, [³ H]2-furoyl-LIGRL-NH₂ , to human PAR2" @default.
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• W2034717109 doi "https://doi.org/10.1038/sj.bjp.0706189" @default.
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