Project description:Blood platelets destined for transfusion release panoply of molecules during preparation and storage. The leukoreduction process made the transfusion safer but did not completely abolish the adverse events. The rationale is to study the proteome profile of platelet components SDA-PC (platelet pellets) involved in transfusion adverse events.
Project description:Blood platelets destined for transfusion release panoply of molecules during preparation and storage. The leukoreduction process made the transfusion safer but did not completely abolish the adverse events. The rationale is to study the proteome profile of platelet components PPC (platelet pellets) involved in transfusion adverse events.
Project description:Genotypic and phenotypic characteristics of Escherichia coli involved in transfusion transmitted bacterial infections:implications for preventive strategies
Project description:We report a transfusion-transmitted hepatitis A virus infection in an immunocompromised patient in France, detected shortly after a transfusion of pathogen-reduced pooled platelets. This case raises questions about the efficacy of donor screening methods. Additional safety measures, such as routine donation screening, should be considered.
Project description:The purpose of this study is to determine if there is an association between hepatitis C infection and kidney cancer. All patients who are diagnosed with kidney cancer and who will either have a biopsy or surgery will be offered to be tested for hepatitis C. The control group will be colon cancer patients. Both groups would be of recent diagnosis (6 months).
Project description:Clinical use of intraoperative auto-transfusion requires the removal of platelets and plasma proteins due to the pump-based suction and water-soluble anticoagulant administration, which causes dilutional coagulopathy. Herein, we develop a carboxylated and sulfonated heparin-mimetic polymer-modified sponge that could spontaneously adsorb blood (1.149 kg/m-2 s-1/2) along with instantaneous anticoagulation. We demonstrate that intrinsic coagulation factors (especially XI) are inactivated by adsorption to the sponge surface, while inactivation of thrombin in the sponge-treated plasma effectively inhibits the common coagulation pathway. Benefiting from the multiple inhibitory effects of sponge on coagulation enzymes and calcium depletion, the whole blood auto-transfusion in trauma-induced hemorrhage is unprecedentedly realized. The transfusion of collected blood favors faster recovery of hemostasis compared to traditional heparinized blood in an animal model. Our work not only develops a safe and convenient approach for whole blood auto-transfusion, but also provides the mechanism of action of self-anticoagulant heparin-mimetic polymer-modified surfaces.
Project description:Proteases, and specifically metalloproteinases, have been linked to the loss of platelet function during storage before transfusion, albeit the mechanism remains unknown. We used a dedicated N-terminomics technique, multiplex iTRAQ-TAILS (Terminal Amine Isotope Labeling of Substrates), to characterize the human platelet proteome, N-terminome, and their post-translational modifications throughout platelet storage under blood banking conditions. From the identified 2,938 proteins and 7,503unique peptides we characterized N-terminal methionine excision, co- and post-translational N-acetylation, maturation and proteolytic processing of proteins in human platelets. We also identified for the first time in platelets 10 proteins previously classified as “missing” in the human proteome. Most of identified N-termini (77%) were internal, of which 105 were novel potential alternative translation start sites, with 2,180 representing stable proteolytic products, thus highlighting a prominent previously uncharacterized role of proteolytic processing during platelet storage. Protease inhibitor studies revealed metalloproteinases as being primarily responsible for proteolytic processing (as opposed to degradation) during storage. System-wide identification of metallo- and other proteinase substrates and their respective cleavage sites offers novel potential mechanisms of their effect on protein activity and platelet function during storage.
Project description:Background: Knowledge about extracellular vesicles (EV) and their molecular cargo in gestational parasitic infections, particularly by Plasmodium and soil-transmitted helminths (STH), is almost non-existent. Objective: To perform isolation and molecular characterization of plasma-derived EVs from Colombian pregnant women and compare quantity, size, concentration and protein cargo of those EVs according to the infectious status. Methodology: Five study groups were formed: 1), Pregnant women with Plasmodium infection. 2), Pregnant women with STH infection. 3), Pregnant women with coinfection Plasmodium and STH. 4), Pregnant women without infection with Plasmodium nor STH. 5), Non-pregnant women without infection with Plasmodium nor STH. Plasma-derived EVs were isolated by size exclusion chromatography (SEC) and fractions containing EVs identified by a bead-based flow cytometric assay for tetraspanin CD9; the size and concentration of EVs were quantified by nanoparticle tracking analysis, and proteins associated with EVs were identified by liquid chromatography-mass spectrometry (LC-MS) in a pool of samples per study group.
