Proteomic analysis of plasma from patients during an acute coronary syndrome
Petra J Mateos-Cáceres1, Antonio García-Méndez, Antonio López Farré
1Cardiovascular Institute, Hospital Clínico San Carlos, Madrid, Spain.
Objectives:
The aim of this study was to analyze modifications in the plasma protein map during an acute coronary syndrome (ACS) using proteomics.
Background:
Proteomics is a new technology that allows the detection and identification of several proteins at a given time in a sample.
Methods:
Plasma from 19 patients, 11 with acute myocardial infarction (AMI) and 8 with unstable angina (UA), was investigated. The control group included nine age-matched volunteers.
Results:
In two-dimensional electrophoresis using a pH range of 4 to 7, constant differences were found in at least four different areas within the plasma protein map. In area 1, we identified the presence of seven alpha(1)-antitrypsin (AAT) isoforms in plasma from control subjects. alpha(1)-antitrypsin isoform 1 was undetectable in plasma from UA and AMI patients. The AAT isoforms 5, 6, and 7 were reduced in plasma from AMI patients when compared with UA patients. Three fibrinogen gamma chain isoforms were identified in area 2. Fibrinogen gamma chain isoforms 1 and 2 were increased in AMI patients with respect to UA patients. Five apolipoprotein A-I isoforms were identified in area 3. All of them were reduced in plasma from AMI patients with respect to UA patients. In area 4, the gamma-immunoglobulin heavy chains were detected and were found increased in plasma from ACS patients.
Conclusions:
Plasma proteomic analysis makes it possible to develop a map of the protein isoforms that are expressed in plasma during an ACS.
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