Associations Between Plasma Levels of NLRP3 Protein, Interleukin-1 Beta and Features of Acute ST-Elevation Myocardial Infarction

BACKGROUND: Phenotyping inflammation in ST-elevation myocardial infarction (STEMI) is a challenge for modern cardiology. NLRP3 inflammasome is a proven predictor of adverse outcomes in cardiovascular disease, but its specificity in stratifying inflammatory activity in patients with myocardial infarction (MI) has not been demonstrated. The aim of this paper is to describe the levels of NLRP3 protein and IL-1β concentrations and their changes in dynamics and associations with clinical, laboratory and instrumental characteristics of patients with STEMI. METHODS: A total of 45 patients with STEMI were enrolled. Concentrations of NLRP3 and IL-1β were evaluated in arterial and venous EDTA blood from the infarct-related coronary and peripheral arteries and veins on days 1, 3 and 7 after MI. RESULTS AND CONCLUSIONS: The concentrations of markers were higher on the first day after MI with a maximum decrease on the third day. The levels of both markers in venous plasma correlated with those in arterial blood, allowing their routine determination in venous plasma on the first day after MI. IL-1β levels correlated directly with the wall motion index and inversely with left ventricular ejection fraction and stroke volume, which characterize the potential contribution to adverse myocardial remodeling. There were two multidirectional trends in changes in NLRP3 and IL-1β levels during hospitalization. Initially higher levels with a gradual decrease by day 7 were associated with a longer duration of myocardial ischemia and higher plasma troponin I levels. Further evaluation of the long-term outcomes of MI will allow identifying inflammatory factors that input to the development of secondary major adverse cardiac events and will provide a new step in the understanding of inflammatory phenotyping.