[Stromal progenitor cells and blood leukocytes after implantation of drug-eluting stents].

Aim of the study was to assess participation in development of restenosis of circulating in blood progenitor cells of stromal line of differentiation and polymorphonuclear granulocytes. We compared levels of osteonectin positive progenitor cells, neutrophils, eosinophils, and basophils in blood of patients with ischemic heart disease (IHD) in whom according to data of angiographic study after endovascular myocardial revascularization with the help of stents with drug coating (Cypher, Cordis Corp, USA) restenosis was detected (n=15), in patients without restenosis (n=23), and in healthy persons (n=17). Levels of stromal progenitor cells and polymorphonuclear granulocytes in blood were measured with the help of methods of flow cytometry. In groups of patients with IHD with and without restenosis number of osteonectin positive cells in blood was higher than in healthy subjects (2.4+/-0.7 and 2.5+/-0.9 vs 1.5+/-0.5 cells/ microL, respectively, p=0.004) without significant differences between groups (p=0.59). These 2 groups of patients did not differ by numbers of leukocytes, neutrophils, and basophils in blood. At the same time we found that in patients with restenosis number of eosinophils in blood was significantly greater than in the group of patients without restenosis (262+/-68 vs 124+/-67 cells/ microL, respectively p<0.001). Moreover in patients with level of eosinophils exceeding 170 cells/ microL rate of development of restenosis was 74% against 5% in patients with number of eosinophils less than 170 cells/ microL (p<0.001). Thus level of stromal progenitor cells in blood of patients with IHD was higher than in healthy persons and remained equally high in groups with and without restenosis. Number of blood eosinophilic leukocytes in patients who had been subjected to coronary stenting in whom later restenosis developed was significantly higher than in patients without restenosis. The data obtained indicate at the presence of link between development of in - stent restenosis and elevated content of eosinophilic granulocytes in blood of patients with IHD.