Monoclonal antibodies directed against P-selectin allow labeling and quantification of degranulated platelets
Monoclonal antibodies directed against P-selectin allow labeling and quantification of degranulated platelets. added additional capabilities to investigate specific platelet proteins. With this chapter, we statement methods for using genetic and pharmacological approaches to investigate H3F1K the function of platelet signaling proteins. While the explained experiments focus on the part of the dual-specificity phosphatase 3 (DUSP3) in platelet signaling, the offered methods are applicable to any signaling enzyme. Specifically, we describe a testing strategy that includes (1) aggregation and secretion experiments with mouse and human being platelets, (2) immunoprecipitation and immunoblot assays to study platelet signaling events, (3) detailed PKC (19-36) protocols to use selected animal models in order to investigate thrombosis and hemostasis in vivo, and (4) strategies for utilizing pharmacological inhibitors on human being platelets. followed by 5 min at 100 at space temperature. Collect cautiously the top layer supernatant comprising the platelet rich plasma (PRP) and transfer to a clean 15 mL conical tube. PRP from different mice of the same genotype can be pooled in one sample (10 min at space temperature. Discard supernatant and dry the 15 mL tube walls using Tork wiping paper. Resuspend washed platelets pellet in 1 mL of 1 1 Tyrodes buffer comprising 1 U/mL apyrase (space temperature). Blend softly by pipetting using 1 mL suggestions. To depend cells, take an aliquot of 20 L of washed platelet suspension and add 180 L of Tyrodes buffer. Blend softly by pipetting using a 1 mL tip and continue with counting using a hematology analyzer. Setup the machine for mouse protocol. Platelets should be resuspended in 1 Tyrodes buffer comprising 1 U/mL apyrase to a concentration of 350 103 platelets/L for aggregation and secretion experiments, and to 500 103 platelets/L for immunoblot and immunoprecipitation (IP) experiments. 3.3. Mouse Platelet Aggregation Assay Light transmission aggregometry is definitely a widely used method to assess platelet reactions to agonists, inhibitors, or after depletion of a specific protein . Platelet aggregation can be monitored by measuring the transmission of light (indicated as percentage of light transmission) through a platelet suspension (PRP or washed platelets). Solitary platelets in suspension form a turbid remedy that reduces the transmission of light. After addition of a platelet receptor agonist, platelets form aggregates that reduce the sample turbidity resulting in an increase of light transmission [13, 14]. Light transmission aggregometry is considered the platinum standard for screening platelet function and allows rapid collection of data for platelet responsiveness to a variety of platelet receptor agonists in small sample volumes . Therefore, we recommend this method as the first step to display for platelet function problems in knockout animals. However, because this method is only semi-quantitative and performed under non-physiological conditions that do not fully mimic aggregate formation in PKC (19-36) PKC (19-36) vivo, it should be combined with additional experiments (as explained below) to assess platelet function. Aliquot 270 L (350 103/L mouse platelets) of washed platelets in 450 L cuvettes comprising one siliconized PKC (19-36) stir bar. Let the platelets rest for 15 min at space temperature. Meanwhile, arranged the aggregometer to optical mode at 37 C and 1200 rpm. Start the AGGRO/LINK8 program and select the test process within the Aggregometer windowpane. Select the quantity of channels to be used (usually two or four, depending on the available equipment. We used the ChronoLog Lumi-Aggregometer). Select run patient within the aggregometer windowpane and show the test conditions when prompted. Make sure to place the cuvette with 500 L Tyrodes buffer in appropriate reference well. Start the assay by clicking on OK. Press collection baselines pushbutton for each test channel. After baselines have stabilized, click on Stop test switch and restart current test within the aggregometer windowpane. Using the 200 L gel loading suggestions, add 2.7 L of the 100 mM CaCl2 stock means to PKC (19-36) fix each cuvette. About 30 s later on, add the receptor agonist to be tested to each cuvette/sample. Start with the highest concentration agonist to be tested. For example, 0.5C1 g/mL of collagen-related peptide (CRP) induces a full, irreversible aggregation of crazy type (WT) mouse platelets 2 min after stimulation. Platelets from WT mice should always become used like a research. Complete aggregation should be reached in the control conditions. When a total (80C100 %) irreversible aggregation is definitely achieved under control conditions,.