Serum was analyzed by 2D-electrophoresis and mass-spectrometry (MALDI-TOF/TOF) in controls and de novo AMI-patients within the first 6 h after onset (admission time), and 3 days after.
Among differential proteins two functional groups showed coordinated changes: immune response-inflammation (alpha-1B-glycoprotein, fetuin-A, serum amyloid P-component (SAP), and complex-forming glycoprotein HC) and complement system (C1r, C3 and factor-B). Immune-related proteins showed a decrease 3 days after admission except for SAP that depicted a progressive increase from the early phase. Specifically, fetuin-A decrease was associated with the extent of myocardial necrosis. C1r and C3 were increased in the early phase with a subsequent decrease 3 days after, being C1r levels at admission correlated with necrosis and troponin-T and GPT levels. Contrarily, factor-B was decreased in the early and late phase post-AMI.
Our results demonstrate that in the late phase post-AMI there is a coordinated decrease in immune response-inflammation proteins, except for SAP which showed an increase related to the specific activation of the classical complement pathway. Changes in immunity and complement-related proteins affect the severity of organ damage influencing prognosis after AMI.
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