Biomaterial Database

Studies of factor IX concentrate therapy in hemophilia. 1983

M B Hultin

The effects of factor IX concentrate therapy on hemostasis in hemophilia patients were studied by means of the radiometric factor IXa assay, the coupled amidolytic assay for factor VIIa, and coagulant assays for factors II, IX, and X, and antithrombin III. Both activated and unactivated concentrates contained factors VIIa and IXa, with the highest levels in the activated concentrates. Factors VIIa and IXa were detected in patient plasma after infusion of unactivated concentrates. Increases of 3-5--fold in factors II and X were also found. Major decreases in antithrombin III activity, but not antigen, were found after unactivated concentrate therapy. This functional decrease may be due to the presence of inactive antithrombin III complexes, since a decreased mobility of antithrombin III antigen by crossed immunoelectrophoresis was found. These studies support the possible importance of factors IXa and VIIa as therapeutic agents and suggest that a transient functional deficiency in antithrombin III may be involved in the thrombotic potential of the concentrates.

UI	MeSH Term	Description	Entries
D001780	Blood Coagulation Tests	Laboratory tests for evaluating the individual's clotting mechanism.	Coagulation Tests, Blood,Tests, Blood Coagulation,Blood Coagulation Test,Coagulation Test, Blood,Test, Blood Coagulation
D003378	Counterimmunoelectrophoresis	Immunoelectrophoresis in which immunoprecipitation occurs when antigen at the cathode is caused to migrate in an electric field through a suitable medium of diffusion against a stream of antibody migrating from the anode as a result of endosmotic flow.	Electrosyneresis,Immunoelectroosmophoresis,Immunoelectrophoresis, Countercurrent,Immunoelectrophoresis, Crossover,Countercurrent Immunoelectrophoresis,Crossover Immunoelectrophoresis
D005164	Factor IX	Storage-stable blood coagulation factor acting in the intrinsic pathway of blood coagulation. Its activated form, IXa, forms a complex with factor VIII and calcium on platelet factor 3 to activate factor X to Xa. Deficiency of factor IX results in HEMOPHILIA B (Christmas Disease).	Autoprothrombin II,Christmas Factor,Coagulation Factor IX,Plasma Thromboplastin Component,Blood Coagulation Factor IX,Factor 9,Factor IX Complex,Factor IX Fraction,Factor Nine,Factor IX, Coagulation
D005167	Factor VII	Heat- and storage-stable plasma protein that is activated by tissue thromboplastin to form factor VIIa in the extrinsic pathway of blood coagulation. The activated form then catalyzes the activation of factor X to factor Xa.	Coagulation Factor VII,Proconvertin,Stable Factor,Blood Coagulation Factor VII,Factor 7,Factor Seven,Factor VII, Coagulation
D006467	Hemophilia A	The classic hemophilia resulting from a deficiency of factor VIII. It is an inherited disorder of blood coagulation characterized by a permanent tendency to hemorrhage.	Factor VIII Deficiency,Hemophilia,Autosomal Hemophilia A,Classic Hemophilia,Deficiency, Factor VIII,Factor 8 Deficiency, Congenital,Factor VIII Deficiency, Congenital,Haemophilia,Hemophilia A, Congenital,Hemophilia, Classic,As, Autosomal Hemophilia,Autosomal Hemophilia As,Classic Hemophilias,Congenital Hemophilia A,Congenital Hemophilia As,Hemophilia A, Autosomal,Hemophilia As,Hemophilia As, Autosomal,Hemophilia As, Congenital,Hemophilias, Classic
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000990	Antithrombin III	A plasma alpha 2 glycoprotein that accounts for the major antithrombin activity of normal plasma and also inhibits several other enzymes. It is a member of the serpin superfamily.	Heparin Cofactor I,Antithrombin III-Alpha,Atenativ,Heparin Co-Factor I,Kybernin,Serpin C1,Thrombate III,Antithrombin III Alpha,Antithrombin IIIAlpha,Cofactor I, Heparin,Heparin Co Factor I
D015942	Factor VIIa	Activated form of factor VII. Factor VIIa activates factor X in the extrinsic pathway of blood coagulation.	Coagulation Factor VIIa,Factor VII, Activated,Blood Coagulation Factor VII, Activated,Factor 7A,Factor Seven A,Activated Factor VII,Factor VIIa, Coagulation
D015949	Factor IXa	Activated form of factor IX. This activation can take place via the intrinsic pathway of blood coagulation by the action of factor XIa and calcium, or via the extrinsic pathway by the action of factor VIIa, thromboplastin, and calcium. Factor IXa serves to activate factor X to Xa by cleaving the arginyl-leucine peptide bond in factor X.	Coagulation Factor IXa,Factor IX, Activated,Blood Coagulation Factor IX, Activated,Factor 9A,Factor Nine A,Activated Factor IX,Factor IXa, Coagulation