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- W2064296383 abstract "Thrombin activates endothelial cell signaling by cleaving the protease-activated receptor-1 (PAR1). However, the function of the apparently nonsignaling receptor PAR3 also expressed in endothelial cells is unknown. We demonstrate here the crucial role of PAR3 in potentiating the responsiveness of PAR1 to thrombin. We tested the hypothesis that PAR1/PAR3 heterodimerization and its effect in modifying G protein selectivity was responsible for PAR3 regulation of PAR1 sensitivity. Using bioluminescent resonance energy transfer-2, we showed that PAR1 had comparable dimerization affinity for PAR3 as for itself. We observed increased Gα 13 coupling between the PAR1/3 heterodimer compared with the PAR1/1 homodimer. Moreover, knockdown of PAR3 moderated the PAR1-activated increase in endothelial permeability. These results demonstrate a role of PAR3 in allosterically regulating PAR1 signaling governing increased endothelial permeability. Because PAR3 is a critical determinant of PAR1 function, targeting of PAR3 may mitigate the effects of PAR1 in activating endothelial responses such as vascular inflammation." @default.
- W2064296383 created "2016-06-24" @default.
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- W2064296383 date "2007-03-27" @default.
- W2064296383 modified "2023-10-11" @default.
- W2064296383 title "Protease-activated receptor-3 (PAR3) regulates PAR1 signaling by receptor dimerization" @default.
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- W2064296383 doi "https://doi.org/10.1073/pnas.0700763104" @default.
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