RESUMO
Background: The aim of this study was to identify novel candidate biomarker proteins differentially expressedin the plasma of patients with early stage acute myocardial infarction (AMI) using SELDI-TOF-MS as a highthroughput screening technology.Methods: Ten individuals with recent acute ischemic-type chest pain (b12 h duration) and ST-segmentelevation AMI (1STEMI) and after a second AMI (2STEMI) were selected. Blood samples were drawn at sixtimes after STEMI diagnosis. The first stage (T0) was in Emergency Unit before receiving any medication, thesecond was just after primary angioplasty (T2), and the next four stages occurred at 12 h intervals after T0.Individuals (n=7) with similar risk factors for cardiovascular disease and normal ergometric test were selectedas a control group (CG). Plasma proteomic profiling analysis was performed using the top-down (i.e. intactproteins) SELDI-TOF-MS, after processing in a Multiple Affinity Removal Spin Cartridge System (Agilent).Results: Compared with the CG, the 1STEMI group exhibited 510 differentially expressed protein peaks in thefirst 48 h after the AMI (pb0.05). The 2STEMI group, had ~85% fewer differently expressed protein peaks thanthose without previous history of AMI (76, pb0.05). Among the 16 differentially-regulated protein peakscommon to both STEMI cohorts (compared with the CG at T0), 6 peaks were persistently down-regulated atmore than one time-stage, and also were inversed correlated with serum protein markers (cTnI, CK and CKMB)during 48 h-period after IAM.Conclusions: Proteomic analysis by SELDI-TOF-MS technology combinedwith bioinformatics tools demonstrateddifferential expression during a 48 h timecourse suggests a potential role of someof these proteins as biomarkersfor the very early stages of AMI, as well as for monitoring early cardiac ischemic recovery.