Abstract
BACKGROUND: The study sends to quantify type 9 matrix metalloproteinase in serum in patients with coronary heart disease, since this enzyme is able to provoke an immunoinflammatory process leading to destabilization of atherosclerotic plaque, the development of unstable angina and acute coronary syndrome.
 AIM: Is to conduct a comparative analysis of the quantitative content of MMR-9 in serum in patients with coronary heart disease (CHD) with a different course of angina and atherosclerosis and in relatively healthy individuals.
 MATERIALS AND METHODS: Blood serum samples of 66 CHD patients were examined. All patients based on clinical examination were divided into 3 groups, depending on the severity of the disease. Quantitative MMR-9 analysis was performed using the Thermo Fisher ELISA kits (BMS2016-2). Determination of the amount of MMR-9 in serum was recorded in the ELX 800 ELISA reader plate. Data processing was carried out using Statistica 6.0 statistical analysis (StatSof, USA). The results were presented as means and mean errors.
 RESULTS: The obtained results indicate a significant decrease in the concentration of MMR-9 in the serum of patients with an unstable course of the disease compared to the control group (relatively healthy people). This is probably due to the effect on the content and activity of its MMR-9 inhibitor TIMP-1. Further studies will investigate whether MMR-9 can be considered as a marker of destabilization of atherosclerotic plaque and act as an independent predictor of acute clinical complications in patients with cardiovascular pathology.
 CONCLUSIONS: The study made it possible to establish a significant decrease in the concentration of MMR-9 in the serum of patients with an unstable course of atherosclerosis compared to the control group (relatively healthy people). In addition, in patients with an unstable course of atherosclerosis, a tendency to reduce the concentration of this enzyme compared to persons with stable atherosclerosis was revealed.
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