Factor IXa Inhibition Contributes to the Heparin Effect
نویسندگان
چکیده
منابع مشابه
Heparin-stimulated inhibition of factor IXa generation and factor IXa neutralization in plasma.
Generation and inhibition of activated factor IXa was studied in factor XIa-activated plasma containing 4 mmol/L free calcium ions and 20 mumol/L phospholipid (25 mol% phosphatidylserine/75 mol% phosphatidylcholine). Interference of other (activated) clotting factors with the factor IXa activity measurements could be avoided by using a highly specific and sensitive bioassay. Factor IXa generati...
متن کاملInhibition of factor IXa and factor Xa by antithrombin III/heparin during factor X activation.
We investigated the kinetics of the inhibitory action of antithrombin III and antithrombin III plus heparin during the activation of factor X by factor IXa. Generation and inactivation curves were fitted to a three-parameter two-exponentional model to determine the pseudo first-order rate constants of inhibition of factor IXa and factor Xa by antithrombin III/heparin. In the absence of heparin,...
متن کاملLocalization of the heparin binding exosite of factor IXa.
Factor IXa (FIXa) is known to have a binding site for heparin that has not been mapped by a mutagenesis study. By homology modeling based on structural data, we identified eight basic residues in the catalytic domain of FIXa that can potentially bind to heparin. These residues, Lys(98), Lys(126), Arg(165), Arg(170), Lys(173), Lys(230), Arg(233), and Lys(239) (chymotrypsin numbering) were substi...
متن کاملThe molecular-weight dependence of the rate-enhancing effect of heparin on the inhibition of thrombin, factor Xa, factor IXa, factor XIa, factor XIIa and kallikrein by antithrombin.
Heparin fractions of different molecular weight and with high affinity for antithrombin were studied with respect to their ability to potentiate the inhibition of activated clotting factors by antithrombin. Inhibition of thrombin, Factor IXa and Factor XIa showed similarities in the dependence on the molecular weight of heparin and was found to decrease with decreasing molecular weight. Inactiv...
متن کاملMechanism of catalysis of inhibition of factor IXa by antithrombin in the presence of heparin or pentasaccharide.
Because of the homology between factor IXa and factor Xa (f.IXa and f.Xa, respectively), and the critical upstream position of f.IXa in the coagulation cascade, the contribution of the heparin-derived pentasaccharide to antithrombin-mediated inhibition of f.IXa was investigated. Pentasaccharide promotes inhibition of both f.IXa and f.Xa generated in recalcified plasma. This result demonstrates ...
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ژورنال
عنوان ژورنال: Thrombosis and Haemostasis
سال: 1991
ISSN: 0340-6245,2567-689X
DOI: 10.1055/s-0038-1646412