Biomaterial Database

Urokinase and non-urokinase fibrinolytic activity in protease-inhibitor-deprived plasma, assayed by a fibrin micro-plate method. 1996

S Fossum, and N O Hoem

Department of Pharmacology, School of Pharmacy, University of Oslo, Norway.

In the classical fibrin-plate assay, fibrinolytic activity is determined by measuring the area of the lysis zone formed when sample is applied on a planar fibrin gel. However, this method is characterized by low capacity and uncertainty in the determination of the lysis zones. To overcome these limitations an assay modified for microtiter plates was developed. Fibrin clots, with a suitable dye incorporated, were formed in wells of standard high adsorbtion microtiter plates. Each plate contained a serial dilution of urokinase as standard. Citrated test plasmas were treated with acetone to remove inhibitors before applied to the wells. The lyzate formed after appropriate incubation was removed, and the remaining volume of fibrin photometrically determined after being completely dissolved by plasmin. The fibrinolytic activity was determined as the difference in absorption before and after lysis. This is an accurate and relatively simple method for the assessment of urokinase and non-urokinase fibrinolytic activity in plasma. It is further a sensitive and quantitative fibrinolytic micro-technique with a high capacity.

UI	MeSH Term	Description	Entries
D011480	Protease Inhibitors	Compounds which inhibit or antagonize biosynthesis or actions of proteases (ENDOPEPTIDASES).	Antiprotease,Endopeptidase Inhibitor,Endopeptidase Inhibitors,Peptidase Inhibitor,Peptidase Inhibitors,Peptide Hydrolase Inhibitor,Peptide Hydrolase Inhibitors,Peptide Peptidohydrolase Inhibitor,Peptide Peptidohydrolase Inhibitors,Protease Antagonist,Protease Antagonists,Antiproteases,Protease Inhibitor,Antagonist, Protease,Antagonists, Protease,Hydrolase Inhibitor, Peptide,Hydrolase Inhibitors, Peptide,Inhibitor, Endopeptidase,Inhibitor, Peptidase,Inhibitor, Peptide Hydrolase,Inhibitor, Peptide Peptidohydrolase,Inhibitor, Protease,Inhibitors, Endopeptidase,Inhibitors, Peptidase,Inhibitors, Peptide Hydrolase,Inhibitors, Peptide Peptidohydrolase,Inhibitors, Protease,Peptidohydrolase Inhibitor, Peptide,Peptidohydrolase Inhibitors, Peptide
D005337	Fibrin	A protein derived from FIBRINOGEN in the presence of THROMBIN, which forms part of the blood clot.	Antithrombin I
D005342	Fibrinolysis	The natural enzymatic dissolution of FIBRIN.	Fibrinolyses
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D001681	Biological Assay	A method of measuring the effects of a biologically active substance using an intermediate in vivo or in vitro tissue or cell model under controlled conditions. It includes virulence studies in animal fetuses in utero, mouse convulsion bioassay of insulin, quantitation of tumor-initiator systems in mouse skin, calculation of potentiating effects of a hormonal factor in an isolated strip of contracting stomach muscle, etc.	Bioassay,Assay, Biological,Assays, Biological,Biologic Assay,Biologic Assays,Assay, Biologic,Assays, Biologic,Bioassays,Biological Assays
D014568	Urokinase-Type Plasminogen Activator	A proteolytic enzyme that converts PLASMINOGEN to FIBRINOLYSIN where the preferential cleavage is between ARGININE and VALINE. It was isolated originally from human URINE, but is found in most tissues of most VERTEBRATES.	Plasminogen Activator, Urokinase-Type,U-Plasminogen Activator,Urinary Plasminogen Activator,Urokinase,Abbokinase,Kidney Plasminogen Activator,Renokinase,Single-Chain Urokinase-Type Plasminogen Activator,U-PA,Single Chain Urokinase Type Plasminogen Activator,U Plasminogen Activator,Urokinase Type Plasminogen Activator