Reduced circulating endothelial progenitor cells in the coronary slow flow phenomenon
Quanzhong Li1, Jinjie Han, Hua Chen
1Department of Cardiology, The Affiliated Hospital of Guilin Medical College, Guangxi, China. drquanzhongli@yahoo.com.cn
Insights
Patients with coronary slow flow (CSF) have significantly fewer circulating endothelial progenitor cells (EPCs). This reduction in EPCs may play a role in the development of CSF.
Area of Science:
- Cardiovascular Research
- Cell Biology
- Vascular Medicine
Background:
- Endothelial progenitor cells (EPCs) are crucial for maintaining endothelial health.
- Coronary slow flow (CSF) is a condition affecting coronary artery blood flow.
- The role of EPCs in CSF pathogenesis is not fully understood.
Purpose of the Study:
- To investigate the levels of circulating EPCs in patients with CSF.
- To determine if reduced EPCs contribute to the development of CSF.
Main Methods:
- Compared EPC counts in 20 CSF patients versus 20 healthy controls.
- Utilized the Thrombolysis in Myocardial Infarction (TIMI) frame count to assess coronary flow.
- Isolated and identified EPCs using Ficoll density gradient centrifugation and immunofluorescence staining.
Main Results:
- CSF patients exhibited significantly lower EPC counts (36.95±6.1) compared to controls (53.95±6.7).
- A negative correlation was observed between TIMI frame counts and EPC numbers in CSF patients (B=-0.65, P<0.01).
Conclusions:
- Reduced circulating EPCs are associated with coronary slow flow.
- Lower EPC levels may be implicated in the pathophysiology of CSF.
Introduction:
Endothelial progenitor cells (EPCs) are important for maintaining the normal function and structure of endothelial cells. We tested the hypothesis that patients with coronary slow flow (CSF) have reduced circulating EPCs that may contribute to the pathogenesis of the CSF phenomenon.
Materials And Methods:
Twenty patients with angiographically proven normal coronary flow (the control group; mean age=55.6±8.2 years) and 20 patients with angiographically proven CSF in any coronary artery (the patient group; mean age=56.6±9.7 years) were included in the study. The thrombolysis in myocardial infarction (TIMI) frame count technique was used to document the coronary flow rates for all of the patients. Ficoll density gradient centrifugation was used to isolate mononuclear cells from peripheral blood cells. An inverted fluorescence microscope and direct fluorescent antibody staining were used to identify EPCs.
Results:
The number of EPCs was significantly reduced in the CSF patient group compared with the control group (36.95±6.1 vs. 53.95±6.7 EPCs/×200 field, P<0.01). A multivariate stepwise regression showed a significant negative correlation between the mean TIMI frame counts and the numbers of EPCs (regression coefficient B=-0.65, P<0.01).
Conclusion:
The number of EPCs was reduced and correlated negatively with the TIMI frame count in the CSF patients. Reduced EPCs may be associated with the pathophysiological process of CSF phenomenon.
