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- W2024289568 abstract "Summary Proteinase‐activated receptors (PARs) can activate a number of signalling events, including T‐cell signal‐transduction pathways. Recent data suggest that the activation of PARs 1, 2 and 3 in Jurkat T‐leukaemic cells induces tyrosine phosphorylation of the haematopoietic signal transducer protein, VAV1. To activate the PARs, this study used the agonist peptides SFLLRNPNDK, SLIGKVDGTS and TFRGAPPNSF, which are based on the sequences of the tethered ligand sequences of human PARs 1, 2 and 3, respectively. Here, we show that peptides based on either the human or murine PAR 3 ‐derived tethered ligand sequences (TFRGAP‐NH 2 or SFNGGP‐NH 2 ) do not activate PAR 3 , but rather activate PARs 1 and 2, either in Jurkat or in other PAR‐expressing cells. Furthermore, whilst thrombin activates only Jurkat PAR 1 , trypsin activates both PARs 1 and 2 and also disarms Jurkat PAR 1 for thrombin activation. We conclude therefore that in Jurkat or related T cells, signalling via PARs that can affect VAV1 phosphorylation is mediated via PAR 1 or 2, or both, and that distinct serine proteinases may potentially differentially affect T‐cell function in the settings of inflammation." @default.
- W2024289568 created "2016-06-24" @default.
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- W2024289568 date "2004-04-27" @default.
- W2024289568 modified "2023-10-16" @default.
- W2024289568 title "Tethered ligand-derived peptides of proteinase-activated receptor 3 (PAR3) activate PAR1 and PAR2 in Jurkat T cells" @default.
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- W2024289568 doi "https://doi.org/10.1111/j.1365-2567.2004.01870.x" @default.
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