Summary
After an acute ischaemic event serum proteins may change reflecting the ischaemic
damage. Proteomic studies could provide new insights into potential biomarkers in
the evolution of ischaemic syndromes. In this study we have investigated the coordinated
changes in coagulation-related proteins in the evolution after an acute myocardial
infarction (AMI). Serum proteome (2D-electrophoresis and MALDI-TOF/ TOF) of AMI-patients
within the first 6 hours after event onset (admission-time) and 3 days after were
compared to controls. Systems biology and bioinformatic analysis were performed to
identify the differentially expressed canonical pathways. In silico analysis of differential proteins revealed changes in the intrinsic coagulation pathway
in the early phase post-AMI. The two identified high-molecular weight kininogen (HMWK)
clusters were inversely correlated in AMI patients at admission, being the intensity
of the low-molecular-weight form inversely related to myocardial necrosis (p<0.05).
Factor XI (FXI) levels were decreased in AMI patients at admission and normalised
3 days after (p<0.05). There was an early increase in fibrinogen gamma and D-dimer
at admission, followed by a decrease in fibrinogen turnover 3 days after (p<0.05).
The influence of elapsed time of ischaemia on fibrinogen distribution changes was
validated in coronary thrombi retrieved by thromboaspiration. In conclusion, our results
demonstrate an active exchange between HMWK forms and a decrease in FXI indicative
of intrinsic pathway activation, together with an increase in fibrinogen gamma turnover
and D-dimer formation in the early phase post-AMI. Moreover, coronary thrombi showed
a dynamic evolution in fibrinogen composition depending on the duration of ischaemia
influencing serum fibrinogen-related products content.
Keywords
Acute myocardial infarction - high-molecular weight kininogen - fibrinogen - thrombus
- proteomics