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• W2110583109 abstract "As thrombin binding to the G protein-coupled proteinase activated receptor-1 (PAR-1) induces endothelial adhesivity to leukocytes through NF-kappaB activation and intercellular adhesion molecule-1 (ICAM-1) expression, we determined the signaling pathways mediating the response. Studies showed that the heterotrimeric G proteins, Galpha(q), and the Gbetagamma dimer were key determinants of the PAR-1 agonist peptide (TFLLRNPNDK)-induced NF-kappaB activation and ICAM-1 expression in endothelial cells. Cotransfection of RGS3T, a regulator of G-protein signaling that inhibits Galpha(q), or alpha-transducin (Galpha(t)), a scavenger of the Gbetagamma, markedly decreased NF-kappaB activity induced by PAR-1 activation. We determined the downstream signaling targets activated by Galpha(q) and Gbetagamma that mediate NF-kappaB activation. Expression of the kinase-defective protein kinase C (PKC)-delta mutant inhibited NF-kappaB activation induced by the constitutively active Galpha(q) mutant, but had no effect on NF-kappaB activity induced by Gbeta(1)gamma(2). In related experiments, NF-kappaB as well as ICAM-1 promoter activation induced by Gbeta(1)gamma(2) were inhibited by the expression of the dominant-negative mutant of 85-kDa regulatory subunit of PI 3-kinase; however, the expression of this mutant had no effect on the response induced by activated Galpha(q). Cotransfection of the catalytically inactive Akt mutant inhibited the NF-kappaB activation induced by the constitutively active PI 3-kinase mutant as well as that by the activated forms of Galpha(q) and PKC-delta. These results support a model in which ligation of PAR-1 induces NF-kappaB activation and ICAM-1 transcription by the engagement of parallel Galphaq/PKC-delta and Gbetagamma/PI3-kinase pathways that converge at Akt." @default.
• W2110583109 created "2016-06-24" @default.
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• W2110583109 date "2002-09-06" @default.
• W2110583109 modified "2023-10-02" @default.
• W2110583109 title "Gα_qand Gβγ Regulate PAR-1 Signaling of Thrombin-Induced NF-κB Activation and ICAM-1 Transcription in Endothelial Cells" @default.
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• W2110583109 doi "https://doi.org/10.1161/01.res.0000033520.95242.a2" @default.
• W2110583109 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/12215488" @default.
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