Abstract 336: Metabolites Reflecting Fresh Venous Thrombus: Lactic Acid and Guanine Enhance Whole Blood Coagulation
Background: Thrombus formation is a multicellular dynamic process involving platelets, leukocytes, and erythrocytes. Recent studies demonstrated that microemvironment affects cellular metabolism and that metabolites can alter the cellular function. The present study aims to identify metabolites reflecting fresh venous thrombus and their role on thrombus formation in rabbit. Methods: We performed metabolomic analysis of rabbit venous blood and jugular venous thrombus 4 hours after endothelial denudation and blood stasis using capillary electrophoresis-time of flight mass spectrometry. Effects of the altered metabolites on blood coagulation and platelet aggregation were assessed with rotation thromboelastometry and platelet aggregometer. Results: The metabolomics analysis identified 226 metabolites (133 cationic and 93 anionic metabolites) in the venous blood and thrombus. The levels of 7 or 4 of them were significantly more (thrombus/ blood ratio >5) or less (thrombus/ blood ratio <1/2) in thrombus than those in blood, and the metabolites included glycolysis, nucleotides, and redox-related metabolites. Three metabolites were detectable only in the blood or venous thrombus. Among the metabolites (thrombus/ blood ratio >5), lactic acid and guanine dose-dependently enhanced whole blood clotting with thromboelastometry. Adenosine monophosphate inhibited collagen-induced platelet aggregation. Conclusion: The glycolysis, nucleotides, and redox-related metabolites may reflect fresh venous thrombus, and lactic acid and guanine may enhance blood coagulation in venous thrombus formation. The metabolic change could provide new insight into the process of venous thrombus formation.