Abstract 12616: Interactive Protein Network of Factor XIII In Platelet Lipid Rafts

Abstract

Background: Factor XIII plays a pivotal role in platelet aggregation. Factor XIII depends on lipid rafts to assemble the proteins required for clot retraction. Several proteins in this assembly remain unidentified. The aim of this study was to investigate which proteins localized in platelet lipid rafts are related to Factor XIII. Methods: Lipid rafts of platelets were isolated by using Lubrol WX 0.05% (w/v) and sucrose gradient. After ultracentrifugation, sucrose fractions were sampled. Lipidomic analysis was performed to identify the platelet lipid raft fractions enriched in cholesterol (Ch) and sphingomyelin (SM) and less so in phosphatidylcholine (PC). These fractions were selected for further proteomic analyses. The network of associated proteins was drawn by STRING database. Results: Sucrose fractions containing platelet lipid rafts were identified (Figure 1A). After proteomics analysis, an interactive network of proteins around FXIIIA was observed (Figure 1B). For these 19 proteins, their STRING score (range 0.576 to 0.900) and the type of their interaction with FXIIIA (activation, binding, catalysis and reaction) are summarized in Table 1. Conclusion: We identified 19 associated proteins with Factor XIII in human platelet lipid rafts. This could provide further insights into clinical targets of pathways through this molecule.