A proteomic focus of the alterations occurring at the human atherosclerotic coronary intima and media

Comunicaciones a congreso

Proteomics: a poweful tool to deepen the molecular mechanisms of ischemic stroke

Comunicaciones a congreso

Hacia un completo entendimiento de la fisiopatología del síndrome coronario agudo mediante la combinación de estudios proteómicos y metabolómicos

Comunicaciones a congreso

Proteomic analysis of intimal layer from human coronary atherothrombotic arteries

Comunicaciones a congreso

Estudio de la Estenosis Aórtica Valvular desde un punto de vista proteómico

Comunicaciones a congreso

Caracterización Proteómica in vivo de células endoteliales circulantes y células progenitoras de endoteliales an pacientes con síndrome coronario agudo

Comunicaciones a congreso

Proteomic characterization of human coronary thrombus in patients with ST-segment elevation acute myocardial infarction

Acute myocardial infarction with ST-segment elevation (STEMI) initiates with intraluminal thrombosis and results in total occlusion of the coronary artery. To date, characterization of the coronary thrombus proteome in STEMI patients has not been yet accomplished. Therefore, we aimed to perform an in-depth proteomic characterization of the human coronary thrombus by means of three different approaches: 2-DE followed by mass spectrometry (MALDI MS/MS), 1-DE combined either with liquid chromatography coupled to mass spectrometry in a MALDI TOF/TOF (LC-MALDI-MS/MS), or in a LTQ-Orbitrap (LC-ESI-MS/MS). This approach allowed us to identify a total of 708 proteins in the thrombus. Expression in coronary thrombi (n=20) of 14 proteins was verified, and the expression of fibrin and 6 cell markers (platelets, monocytes, neutrophils, eosinophils, T-cells and B-cells) quantified by selected reaction monitoring (SRM). A positive correlation of 5 proteins (fermitin homolog 3, thrombospondin-1, myosin-9, beta parvin and ras-related protein Rap-1b) with CD41 was found, pointing out the potential activation of a focal adhesion pathway within thrombus platelets. DIDO1 protein was found to correlate negatively with thrombus fibrin, and was found up-regulated in the plasma of these STEMI patients, which may constitute a starting point for further analyses in the search for biomarkers of thrombosis. BIOLOGICAL SIGNIFICANCE: The proteomic characterization of the human coronary thrombus may contribute to a better understanding of the mechanisms involved in acute coronary syndrome, and thus pave the road for the identification of new therapeutic targets that may help addressing this and other thrombotic diseases. A novel methodology to characterize thrombus composition and expression of a sub-group of proteins is hereby described, which allowed linking protein expression with cellular and ECM matrix composition of the thrombus. Five proteins (fermitin homolog 3, thrombospondin-1, myosin-9, beta parvin and ras-related protein Rap-1b) co-express within the human coronary thrombus with CD41, pointing out the potential activation of a focal adhesion pathway within thrombus platelets during thrombus formation. Besides, the protein death-inducer obliterator 1, found to be expressed within the human coronary thrombus, has been proved to increase in the plasma of STEMI patients, which constitutes an important starting point for further analyses in the search for biomarkers of thrombosis.This work was supported by grants from the Instituto de Salud Carlos III (FIS PI070537, PI11/02239), Fondos Feder, Redes temáticas de Investigación Cooperativa en Salud (RD12/0042/ 0071, RD06/0014/1015), and Fundación para la Investigación Sanitaria de Castilla-La Mancha (FISCAM PI2008-08, PI2008-28, PI2008-52). These results are lined up with the Spanish initiative on the Human Proteome Project (SpHPP). The CNIC is supported by the Spanish Ministerio de Economia y Competitividad and the Fundacion Pro-CNIC. We would like to thank Dr. Gloria Alvarez-Llamas for her kind suggestions for the manuscript; Gemma Barroso from Proteomic Unit, Hospital Nacional de Paraplejicos, for her help and dedication to this work, as well as Veronica Moral and Ana Gallardo from the same Unit, and TamaraSastre andCarmenBermudez for their technical support.S