Local complement activation triggers neutrophil recruitment to the site of thrombus formation in acute myocardial infarction

 

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Summary

Atherosclerotic plaque rupture with subsequent mural thrombus formation is considered the main event compromising epicardial flow in acute myocardial infarction (AMI). However, the precise mechanisms underlying acute coronary occlusion are unknown.

We compared the proteomic profiles of systemic plasma and plasma derived from the site of thrombus formation of patients with AMI by two-dimensional gel electrophoresis and ELISA. We identified a local activation of the complement system, with selective accumulation of the complement activator Creactive protein (CRP) and the downstream complement effectors C3a and C5a. CRP in coronary thrombus co-localised with C1q and C3 immunoreactivities, suggesting classical complement activation. In vitro, coronary thrombus derived plasma enhanced neutrophil chemotaxis in a C5a dependent fashion. In vivo, neutrophil accumulation at the site of thrombus formation paralleled the time delay from symptom onset to first balloon inflation or aspiration, and was correlated with C5a and enzymatic infarct size. We present the first direct evidence for localised complement activation in acute coronary thrombi. Our data indicate that local complement effectors amplify the vascular occlusion process in AMI by enhanced neutrophil recruitment.

^* Both authors contributed equally.

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