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• W2802192734 abstract "Objective— Platelet activation after stimulation of PAR (protease-activated receptor) 4 is heightened in platelets from blacks compared with those from whites. The difference in PAR4 signaling by race is partially explained by a single-nucleotide variant in PAR4 encoding for either an alanine or threonine at amino acid 120 in the second transmembrane domain. The current study sought to determine whether the difference in PAR4 signaling by this PAR4 variant is because of biased G q signaling and whether the difference in PAR4 activity results in resistance to traditional antiplatelet intervention. Approach and Results— Membranes expressing human PAR4-120 variants were reconstituted with either G q or G 13 to determine the kinetics of G protein activation. The kinetics of G q and G 13 activation were both increased in membranes expressing PAR4-Thr120 compared with those expressing PAR4-Ala120. Further, inhibiting PAR4-mediated platelet activation by targeting COX (cyclooxygenase) and P2Y 12 receptor was less effective in platelets from subjects expressing PAR4-Thr120 compared with PAR4-Ala120. Additionally, ex vivo thrombus formation in whole blood was evaluated at high shear to determine the relationship between PAR4 variant expression and response to antiplatelet drugs. Ex vivo thrombus formation was enhanced in blood from subjects expressing PAR4-Thr120 in the presence or absence of antiplatelet therapy. Conclusions— Together, these data support that the signaling difference by the PAR4-120 variant results in the enhancement of both G q and G 13 activation and an increase in thrombus formation resulting in a potential resistance to traditional antiplatelet therapies targeting COX-1 and the P2Y 12 receptor." @default.
• W2802192734 created "2018-05-17" @default.
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• W2802192734 date "2018-07-01" @default.
• W2802192734 modified "2023-10-10" @default.
• W2802192734 title "Genetic Variant in Human PAR (Protease-Activated Receptor) 4 Enhances Thrombus Formation Resulting in Resistance to Antiplatelet Therapeutics" @default.
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• W2802192734 doi "https://doi.org/10.1161/atvbaha.118.311112" @default.
• W2802192734 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6023764" @default.
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