Biomaterial Database

Effects of inhibitors of arachidonic acid metabolism on thromboplastin activity in human monocytes. 1984

D J Crutchley

Human isolated monocytes possess low levels of procoagulant activity, which was stimulated 10-30 fold by brief (2 hr) exposure to 10 micrograms/ml endotoxin. This activity was expressed in normal or factor XII-deficient plasma, but lost in plasma deficient in factors X or VII, indicating that it was due to thromboplastin. The stimulation of monocyte thromboplastin by endotoxin was inhibited in a dose-dependent manner by two phospholipase A2 inhibitors, 4-bromophenacyl bromide and quinacrine, and by two lipoxygenase inhibitors, eicosatetraynoic acid and nordihydroguaiaretic acid. Two cyclooxygenase inhibitors, aspirin and indomethacin, prevented endotoxin-induced increases in thromboxane B2 production but had no effect on thromboplastin production. These results suggest that a component in the sequence of lipid deacylation, arachidonic acid release, and metabolism via lipoxygenase may mediate the stimulation of monocyte thromboplastin activity by endotoxin.

UI	MeSH Term	Description	Entries
D009000	Monocytes	Large, phagocytic mononuclear leukocytes produced in the vertebrate BONE MARROW and released into the BLOOD; contain a large, oval or somewhat indented nucleus surrounded by voluminous cytoplasm and numerous organelles.	Monocyte
D010741	Phospholipases A	Phospholipases that hydrolyze one of the acyl groups of phosphoglycerides or glycerophosphatidates.
D004731	Endotoxins	Toxins closely associated with the living cytoplasm or cell wall of certain microorganisms, which do not readily diffuse into the culture medium, but are released upon lysis of the cells.	Endotoxin
D005168	Factor VII Deficiency	An autosomal recessive characteristic or a coagulation disorder acquired in association with VITAMIN K DEFICIENCY. FACTOR VII is a Vitamin K dependent glycoprotein essential to the extrinsic pathway of coagulation.	Hypoproconvertinemia,Deficiency, Factor 7,Deficiency, Factor Seven,Deficiency, Factor VII,Factor 7 Deficiency,Deficiencies, Factor 7,Deficiencies, Factor Seven,Deficiencies, Factor VII,Factor 7 Deficiencies,Factor Seven Deficiencies,Factor Seven Deficiency,Factor VII Deficiencies,Hypoproconvertinemias
D005171	Factor X Deficiency	Blood coagulation disorder usually inherited as an autosomal recessive trait, though it can be acquired. It is characterized by defective activity in both the intrinsic and extrinsic pathways, impaired thromboplastin time, and impaired prothrombin consumption.	Deficiency, Factor 10,Deficiency, Factor Ten,Deficiency, Factor X,Deficiency, Stuart-Prower,Deficiency, Stuart-Prower Factor,Factor 10 Deficiency,Factor Ten Deficiency,Stuart-Prower Deficiency,Stuart-Prower Factor Deficiency,Deficiencies, Factor 10,Deficiencies, Factor Ten,Deficiencies, Factor X,Deficiency, Stuart Prower,Deficiency, Stuart Prower Factor,Factor 10 Deficiencies,Factor Ten Deficiencies,Factor X Deficiencies,Stuart Prower Deficiency,Stuart Prower Factor Deficiency,Ten Deficiencies, Factor
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D001091	Arachidonate Lipoxygenases	Enzymes catalyzing the oxidation of arachidonic acid to hydroperoxyarachidonates. These products are then rapidly converted by a peroxidase to hydroxyeicosatetraenoic acids. The positional specificity of the enzyme reaction varies from tissue to tissue. The final lipoxygenase pathway leads to the leukotrienes. EC 1.13.11.- .	Arachidonic Acid Lipoxygenase,Lipoxygenase, Arachidonic Acid,Lipoxygenases, Arachidonate
D001095	Arachidonic Acids		Eicosatetraenoic Acids,Acids, Arachidonic,Acids, Eicosatetraenoic
D013925	Thromboplastin	Constituent composed of protein and phospholipid that is widely distributed in many tissues. It serves as a cofactor with factor VIIa to activate factor X in the extrinsic pathway of blood coagulation.	Antigens, CD142,CD142 Antigens,Coagulation Factor III,Factor III,Tissue Factor,Tissue Thromboplastin,Blood Coagulation Factor III,Coagulin,Glomerular Procoagulant Activity,Prothrombinase,Tissue Factor Procoagulant,Urothromboplastin,Activity, Glomerular Procoagulant,Factor III, Coagulation,Procoagulant Activity, Glomerular,Procoagulant, Tissue Factor,Thromboplastin, Tissue
D013929	Thromboxane B2	A stable, physiologically active compound formed in vivo from the prostaglandin endoperoxides. It is important in the platelet-release reaction (release of ADP and serotonin).	B2, Thromboxane