Biomaterial Database

The role of factor XI in the coagulant activity of platelets. 1977

J M Connellan, and P A Castaldi, and R H Muntz

Washed platelets were ruptured by freezing and thawing; a coagulant activity was released which would correct the clotting time of factor XI (FXI)-deficient plasma only in the presence of kaolin. Platelets from a FXI-deficient patient treated in a similar fashion also released a coagulant activity which could be absorbed onto Sepharose-heparin and eluted similarly to plasma FXI. Collagen was employed to induce a coagulant activity in platelet-poor plasma (PPP) and platelet-rich plasma (PRP) in the presence and absence of antibodies developed to purified FXI and FXII. The presence of FXII antibody had little effect on the activity induced in PRP. However, the presence of FXI antibody eliminated the difference between PPP and PRP. An activity was induced when FXI-deficient PRP was incubated with collagen and none with PPP. One type of collagen failed to induce a coagulant activity.

UI	MeSH Term	Description	Entries
D010974	Platelet Aggregation	The attachment of PLATELETS to one another. This clumping together can be induced by a number of agents (e.g., THROMBIN; COLLAGEN) and is part of the mechanism leading to the formation of a THROMBUS.	Aggregation, Platelet
D001777	Blood Coagulation	The process of the interaction of BLOOD COAGULATION FACTORS that results in an insoluble FIBRIN clot.	Blood Clotting,Coagulation, Blood,Blood Clottings,Clotting, Blood
D001792	Blood Platelets	Non-nucleated disk-shaped cells formed in the megakaryocyte and found in the blood of all mammals. They are mainly involved in blood coagulation.	Platelets,Thrombocytes,Blood Platelet,Platelet,Platelet, Blood,Platelets, Blood,Thrombocyte
D004591	Electrophoresis, Polyacrylamide Gel	Electrophoresis in which a polyacrylamide gel is used as the diffusion medium.	Polyacrylamide Gel Electrophoresis,SDS-PAGE,Sodium Dodecyl Sulfate-PAGE,Gel Electrophoresis, Polyacrylamide,SDS PAGE,Sodium Dodecyl Sulfate PAGE,Sodium Dodecyl Sulfate-PAGEs
D005169	Factor VIII	Factor VIII of blood coagulation. Antihemophilic factor that is part of the factor VIII/von Willebrand factor complex. Factor VIII is produced in the liver and acts in the intrinsic pathway of blood coagulation. It serves as a cofactor in factor X activation and this action is markedly enhanced by small amounts of thrombin.	Coagulation Factor VIII,Factor VIII Clotting Antigen,Factor VIII Coagulant Antigen,Factor VIII Procoagulant Activity,Thromboplastinogen,Blood Coagulation Factor VIII,F VIII-C,Factor 8,Factor 8 C,Factor Eight,Factor VIIIC,Hyate-C,Hyatt-C,F VIII C,Hyate C,HyateC,Hyatt C,HyattC
D005172	Factor XI	Stable blood coagulation factor involved in the intrinsic pathway. The activated form XIa activates factor IX to IXa. Deficiency of factor XI is often called hemophilia C.	Coagulation Factor XI,Plasma Thromboplastin Antecedent,Blood Coagulation Factor XI,Factor 11,Factor Eleven,Antecedent, Plasma Thromboplastin,Factor XI, Coagulation,Thromboplastin Antecedent, Plasma
D005173	Factor XI Deficiency	A hereditary deficiency of blood coagulation factor XI (also known as plasma thromboplastin antecedent or PTA or antihemophilic factor C) resulting in a systemic blood-clotting defect called hemophilia C or Rosenthal's syndrome, that may resemble classical hemophilia.	Hemophilia C,Rosenthal Syndrome,Deficiency, Factor 11,Deficiency, Factor Eleven,Deficiency, Factor XI,Factor 11 Deficiency,Factor Eleven Deficiency,Plasma Thromboplastin Antecedent Deficiency,Rosenthal's Syndrome,Deficiencies, Factor 11,Deficiencies, Factor Eleven,Deficiencies, Factor XI,Factor 11 Deficiencies,Factor Eleven Deficiencies,Factor XI Deficiencies,Rosenthal Syndromes,Rosenthal's Syndromes,Rosenthals Syndrome,Syndrome, Rosenthal,Syndrome, Rosenthal's
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man