RESUMO
BACKGROUND: Endothelial dysfunction has been suggested as a potential mechanism contributing to the development and progression of heart failure (HF). Levels of circulating endothelial cells (CECs), endothelial progenitor cells (EPCs), and hematopoietic stem and progenitor cells (HSPCs) have been recognized as useful markers of vascular damage and endothelial repair in response to tissue injury. AIMS: To evaluate the circulating levels of EPCs, CECs, and HSPCs among patients with HF with reduced ejection fraction (HFrEF). METHODS: In 82 individuals (42 patients with HFrEF and 42 age-matched subjects without established cardiovascular disease), peripheral blood was drawn and levels of EPCs, CECs, and HSPCs were quantified by flow cytometry. RESULTS: Patients with HFrEF showed lower levels of circulating EPCs (5.28 × 10-3 ± 6.83 × 10-4% vs. 7.76 × 10-3 ± 4.91 × 10-4%, p ≤0.001) and CECs (5.11 × 10-3 ± 7.87 × 10-4% vs. 6.51 × 10-3 ± 5.21 × 10-4%, p = 0.005) when compared to the age-matched group. Circulating levels of HSPCs were not significantly different between groups (p = 0.590). Additionally, the number of EPCs and CECs was significantly higher in HFrEF patients with overweight/obesity (n = 24) compared to patients with normal weight (n = 17). CONCLUSION: Circulating levels of EPCs and CECs were significantly decreased in patients with HFrEF in comparison to age-matched subjects without established cardiovascular disease, suggesting that the levels of CECs and EPCs may be potential biomarkers of the cellular response to vascular injury in patients with HFrEF.
