Background: The angiopoietic endothelial dysfunction in ischemic cardiomyopathy (ICMP) remains unexplored. Aim: The identification of the imbalance of endothelial dysfunction mediators and the number of endothelial progenitor (EPC) and desquamated (EDC) cells in patients with coronary heart disease (CHD) with and without ICMP. Methods: A total of 87 patients (47 with ICMP and 40 without ICMP) were observed. The content of EPCs (CD14+CD34+VEGFR2+) in vein blood and EDCs (CD45−CD146+) in the blood from the coronary sinus and cubital vein was determined by flow cytometry. The contents of HIF-1α and HIF-2α in vein blood as well as that of ADMA and endothelin-1 in sinus plasma and angiopoietin-2, MMP-9 and galectin-3 in both samples were assessed using ELISA, and VEGF, PDGF, SDF-1 and MCP-1 contents using immunofluorescence. Results: ADMA and endothelin-1 levels in the sinus blood were comparable between the patient groups; a deficiency of HIF-1α and excess of HIF-2α were detected in the vein blood of ICMP patients. The EDC content in the vein blood increased in CHD patients regardless of ICMP, and the concentrations of VEGF-A, VEGF-B, PDGF, MCP-1, angiopoietin-2, and MMP-9 were normal. In ICMP patients, vein blood was characterized by an excess of galectin-3 and sinus blood by an excess of EDCs, angiopoietin-2, MMP-9 and galectin-3. Conclusion: ICMP is accompanied by angiopoietic endothelial dysfunction.

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Endothelial progenitor cells (EPCs) are the cells that play a key role in maintaining vascular integrity and repairing endothelial damage. It has been shown that EPCs can differentiate into mature endothelial cells and are also capable of producing various regulatory growth factors and cytokines. There are many studies focusing on the associations between coronary artery disease and circulating EPCs. However, it is still challenging to use EPCs for the development of diagnostic and treatment algorithms in cardiovascular diseases. This review presents data on EPCs subtypes, methods for obtaining them, biological characteristics of cell populations, and the factors of EPCs mobilization to the site of injury in cardiovascular diseases.

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Highlights. The features of subsets of monocytes in combination with the levels of desquamated endotheliocytes, endothelial damage and regeneration mediators and progenitor cell migration-enhancing factors in patients with coronary heart disease and with/without ischemic cardiomyopathy were analyzed. For the first time it was shown that in patients with ischemic cardiomyopathy, compared with CHD patients without cardiomyopathy, higher desquamation of the endothelium is associated with a deficiency of non-classical monocytes and reduced migration of progenitor endothelial cells (VEGFR2+-monocytes) with regenerative potential across the bone marrow due to a deficiency of the HIF-1α mediator in the blood.Background. The development of ischemic cardiomyopathy (ICM) is an understudied process, and one of its elements may be insufficient regeneration of blood vessels due to an imbalance of subsets of monocytes in the blood.Aim. To assess subsets of monocytes and desquamated endothelial cells in combination with endothelial damage and regeneration mediators in the blood of patients with coronary heart disease (CHD) and with/without ICM.Methods. The study included 30 patients with ICM, 22 patients with coronary heart disease without cardiomyopathy aged 55–69 years, and 18 healthy donors. In whole blood, the populations of CD45–CD146+ desquamated endothelial cells and progenitor endothelial cells related to CD14+VEGFR2+  monocytes, intermediate CD14++CD16+   and  non-classical  CD14+CD16++   monocytes  were  assessed  by flow cytometry  using  the  appropriate  monoclonal  antibodies  (BD  Biosciens, USA). In blood plasma, the levels of hypoxia-inducible factor HIF-1α, monocyte chemoattractant protein MCP-1 and matrix metalloproteinase MMP-9 were assessed by enzyme immunoassay. The results of the analysis were considered significant at p<0.05.Results. The number of progenitor and desquamated endothelial cells was increased in both groups of patients with coronary artery disease. At the same time, in patients with ICM, the number of progenitor endothelial cells did not reach the number noted in patients with CHD without cardiomyopathy, while the number of desquamated endothelial cells reached the number noted in CHD patients without cardiomyopathy. There was a deficiency of non-classical monocytes and HIF-1α in the blood of patients with ICM, and an excess of intermediate monocytes and MCP-1 was observed in CHD patients without cardiomyopathy. The concentration of MMP-9 in patients with CHD corresponded to the norm, regardless of the presence of ICM.Conclusion. In ICM, in contrast to CHD without cardiomyopathy, vascular damage is associated with a deficiency of nonclassical monocytes and reduced endothelial repair due to insufficient migration of progenitor endothelial cells across the bone marrow due to HIF-1α deficiency in the blood.