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• W1964571515 abstract "Factor (F)VIII functions as a cofactor in the tenase complex responsible for phospholipid (PL)-dependent FXa generation by FIXa. We have recently reported that the FVIIIa C2 domain (residues 2228-2240) interacts with the FIXa Gla domain in this complex. We examined the role of this interaction in the generation of tenase activity during the process of clot formation, using a synthetic peptide corresponding to residues 2228-2240. The peptide 2228-2240 inhibited FVIIIa/FIXa-mediated FX activation dose-dependently in the presence of PL by >95% (IC50; ~10 μM). This effect was significantly greater than that obtained by peptide 1804-1818 (IC50; ~180 μM) which corresponds to another FIXa-interactive site in the light chain that provides the majority of binding energy for FIXa interaction. Peptide 2228-2240 had little effect on the prothrombin time and did not inhibit FIX activation in the coagulation process mediated by FVIIa/tissue factor or FXIa, suggesting specific inhibition of the intrinsic tenase complex. Clot waveform analysis, a plasma based-assay used to evaluate the process of intrinsic coagulation, demonstrated that peptide 2228-2240 significantly depressed both maximum coagulation velocity (|min1|) and acceleration (|min2|), reflecting the propagation of clot formation, although the clotting time was only marginally prolonged. Thromboelastography, an alternative whole blood based-assay, demonstrated that the peptide inhibited clot formation time, α-angle and maximal clot firmness, but had little effect on the clotting time. Interactions of the FVIIIa C2 domain (residues 2228-2240) with the FIXa Gla domain in the tenase complex appeared to contribute essentially to the propagation of clot formation." @default.
• W1964571515 created "2016-06-24" @default.
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• W1964571515 date "2011-01-01" @default.
• W1964571515 modified "2023-09-23" @default.
• W1964571515 title "Interactions between residues 2228–2240 within factor VIIIa C2 domain and factor IXa Gla domain contribute to propagation of clot formation" @default.
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• W1964571515 doi "https://doi.org/10.1160/th11-03-0203" @default.
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