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Assay Method Information

Assay Name:  Plasma-based Clot Lysis Assay
Description:  The clot-lysis test system configures the kinetics of clot formation and degradation in vitro and allows quantifying modulation of the process by selected test compounds.The test compounds were dissolved in 1% acetic acid and further complemented with an equal volume of DMSO. The resulting stock solutions were serially diluted in 0.5% acetic acid/50% DMSO. 1 μL aliquots of these solutions were placed into 384 well microplates (Greiner, black, transparent bottom), followed by 30 μL of diluted human citrated plasma (platelet-poor, final concentration: 5%; supplemented with fibrinogen, final concentration: 3 μM; dilution buffer: 20 mM HEPES, 150 mM NaCl, 0.01% Brij (pH 7)). The reactions were started by addition of 20 μL of CaCl2 (final concentration: 10 mM), and tPA (tissue plasminogen activator, final concentration: 0.2 nM) in dilution buffer, followed by an additional volume of 20 μL dilution buffer for improved mixing. The reactions were incubated at 37 C. Clot formation and degradation was monitored spectrophotometrically by kinetic optical density measurements at 405 nm. IC50 values were determined by comparing the resulting time courses with the time course of a blank control reaction.
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Last update November 1, 2007
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