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• W2105445556 abstract "Several preclinical studies have found a poor correlation between the ex vivo platelet inhibitory potency and the in vivo antithrombotic efficacy of GPIIb/IIIa receptor antagonists. The present study was designed to examine the differential in vitro potencies of c7E3, MK-383, DMP-728, and SM-20302 in inhibiting ex vivo platelet aggregation under normocalcemic and hypocalcemic conditions. Human blood was collected in either trisodium citrate (0.37%) or PPACK (20 µg/mL). Platelet aggregation assays were performed in platelet-rich plasma from citrate-anticoagulated blood (cPRP) and PPACK-anticoagulated blood (pPRP) using ADP (20 µM) and TRAP (10 µM) as agonists in the presence of c7E3, MK-383, DMP-728, or SM-20302. The concentration of ionized calcium in cPRP was 16–19 times lower than that in pPRP. The IC50 of c7E3 for inhibiting ADP-induced platelet aggregation in cPRP (2.76 ± 0.11 µg/mL) was 1.6 times lower than that in pPRP (4.46 ± 0.48 µg/mL; P < 0.05). Similarly, the IC50 for c7E3 for inhibiting TRAP-induced platelet aggregation in cPRP (4.52 ± 0.34 µg/mL) was 1.7 times lower than that in pPRP (7.69 ± 0.43 µg/mL; P < 0.05). MK-383, DMP-728, and SM-20302 also demonstrated 1.96-, 1.15-, and 1.43-fold lower IC50 values, respectively, in cPRP as compared with pPRP. Chelation of ionized calcium in pPRP led to a progressive increase in platelet inhibition by all the antagonists. These results suggest that the observed in vitro inhibitory potency of a GPIIb/IIIa receptor antagonist is markedly enhanced when trisodium citrate is used as an anticoagulant to collect blood for ex vivo assay. These findings indicate that dosing regimens for GPIIb/IIIa receptor antagonists based on the platelet inhibition profile in citrate may provide misleading information with respect to their true in vivo antithrombotic efficacy." @default.
• W2105445556 created "2016-06-24" @default.
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• W2105445556 date "2000-01-01" @default.
• W2105445556 modified "2023-10-16" @default.
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• W2105445556 doi "https://doi.org/10.1023/a:1018679708251" @default.
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