| http://purl.uniprot.org/citations/18622013 | http://www.w3.org/1999/02/22-rdf-syntax-ns#type | http://purl.uniprot.org/core/Journal_Citation |
| http://purl.uniprot.org/citations/18622013 | http://www.w3.org/1999/02/22-rdf-syntax-ns#type | http://purl.uniprot.org/core/Journal_Citation |
| http://purl.uniprot.org/citations/18622013 | http://www.w3.org/2000/01/rdf-schema#comment | "Proteinase-activated receptor 2 (PAR2), a seven-transmembrane G protein-coupled receptor, is activated at inflammatory sites by proteolytic cleavage of its extracellular N terminus by trypsin-like enzymes, exposing a tethered, receptor-activating ligand. Synthetic agonist peptides (AP) that share the tethered ligand sequence also activate PAR2, often measured by Ca2+ release. PAR2 contributes to inflammation through activation of NF-kappaB-regulated genes; however, the mechanism by which this occurs is unknown. Overexpression of human PAR2 in HEK293T cells resulted in concentration-dependent, PAR2 AP-inducible NF-kappaB reporter activation that was protein synthesis-independent, yet blocked by inhibitors that uncouple Gi proteins or sequester intracellular Ca2+. Because previous studies described synergistic PAR2- and TLR4-mediated cytokine production, we hypothesized that PAR2 and TLR4 might interact at the level of signaling. In the absence of TLR4, PAR2-induced NF-kappaB activity was inhibited by dominant negative (DN)-TRIF or DN-TRAM constructs, but not by DN-MyD88, findings confirmed using cell-permeable, adapter-specific BB loop blocking peptides. Co-expression of TLR4/MD-2/CD14 with PAR2 in HEK293T cells led to a synergistic increase in AP-induced NF-kappaB signaling that was MyD88-dependent and required a functional TLR4, despite the fact that AP exhibited no TLR4 agonist activity. Co-immunoprecipitation of PAR2 and TLR4 revealed a physical association that was AP-dependent. The response to AP or lipopolysaccharide was significantly diminished in TLR4(-/-) and PAR2(-/-) macrophages, respectively, and SW620 colonic epithelial cells exhibited synergistic responses to co-stimulation with AP and lipopolysaccharide. Our data suggest a unique interaction between two distinct innate immune response receptors and support a novel paradigm of receptor cooperativity in inflammatory responses."xsd:string |
| http://purl.uniprot.org/citations/18622013 | http://purl.org/dc/terms/identifier | "doi:10.1074/jbc.m804800200"xsd:string |
| http://purl.uniprot.org/citations/18622013 | http://purl.org/dc/terms/identifier | "doi:10.1074/jbc.m804800200"xsd:string |
| http://purl.uniprot.org/citations/18622013 | http://purl.uniprot.org/core/author | "Fasano A."xsd:string |
| http://purl.uniprot.org/citations/18622013 | http://purl.uniprot.org/core/author | "Fasano A."xsd:string |
| http://purl.uniprot.org/citations/18622013 | http://purl.uniprot.org/core/author | "Vogel S.N."xsd:string |
| http://purl.uniprot.org/citations/18622013 | http://purl.uniprot.org/core/author | "Vogel S.N."xsd:string |
| http://purl.uniprot.org/citations/18622013 | http://purl.uniprot.org/core/author | "Rallabhandi P."xsd:string |
| http://purl.uniprot.org/citations/18622013 | http://purl.uniprot.org/core/author | "Rallabhandi P."xsd:string |
| http://purl.uniprot.org/citations/18622013 | http://purl.uniprot.org/core/author | "Piao W."xsd:string |
| http://purl.uniprot.org/citations/18622013 | http://purl.uniprot.org/core/author | "Piao W."xsd:string |
| http://purl.uniprot.org/citations/18622013 | http://purl.uniprot.org/core/author | "Medvedev A.E."xsd:string |
| http://purl.uniprot.org/citations/18622013 | http://purl.uniprot.org/core/author | "Medvedev A.E."xsd:string |
| http://purl.uniprot.org/citations/18622013 | http://purl.uniprot.org/core/author | "Hollenberg M.D."xsd:string |
| http://purl.uniprot.org/citations/18622013 | http://purl.uniprot.org/core/author | "Hollenberg M.D."xsd:string |
| http://purl.uniprot.org/citations/18622013 | http://purl.uniprot.org/core/author | "Nhu Q.M."xsd:string |
| http://purl.uniprot.org/citations/18622013 | http://purl.uniprot.org/core/author | "Nhu Q.M."xsd:string |
| http://purl.uniprot.org/citations/18622013 | http://purl.uniprot.org/core/author | "Toshchakov V.Y."xsd:string |
| http://purl.uniprot.org/citations/18622013 | http://purl.uniprot.org/core/author | "Toshchakov V.Y."xsd:string |
| http://purl.uniprot.org/citations/18622013 | http://purl.uniprot.org/core/date | "2008"xsd:gYear |
| http://purl.uniprot.org/citations/18622013 | http://purl.uniprot.org/core/date | "2008"xsd:gYear |
| http://purl.uniprot.org/citations/18622013 | http://purl.uniprot.org/core/name | "J. Biol. Chem."xsd:string |
| http://purl.uniprot.org/citations/18622013 | http://purl.uniprot.org/core/name | "J. Biol. Chem."xsd:string |