Functional Impairment of Endothelial Colony Forming Cells (ECFC) in Patients with Severe Atherosclerotic...

Area of Science:

• Cardiovascular Research
• Cell Biology
• Immunology

Background:

• Endothelial dysfunction is central to atherosclerosis development.
• The relationship between endothelial repair mechanisms and atherosclerotic cardiovascular disease (ASCVD) severity remains incompletely understood.
• Circulating endothelial progenitor cells (EPCs) are crucial for vascular repair.

Purpose of the Study:

• To investigate the link between ASCVD severity, inflammation, and the function of circulating endothelial progenitor cells, specifically endothelial colony-forming cells (ECFCs).
• To assess how ASCVD impacts the reparative and angiogenic properties of ECFCs.
• To explore the association between ECFC alterations, inflammation, and cellular senescence.

Main Methods:

• Quantified circulating progenitor cells (CD34+, CD45+CD34+KDR+) using flow cytometry in 243 subjects.
• Assessed ECFC colony-forming capacity, proliferation, senescence, and vasculogenic properties via ex vivo culture.
• Measured plasma IL-6 and VEGF-A levels using Cytokine Array.
• Correlated ECFC function with ASCVD severity (number of vascular territories involved).

Main Results:

• ASCVD patients exhibited increased circulating progenitor cells but impaired ECFC colony-forming capacity and angiogenic potential.
• These functional deficits in ECFCs were dependent on ASCVD severity.
• Impaired ECFC function correlated with an increased senescent phenotype and elevated plasma IL-6 levels.

Conclusions:

• ASCVD progressively impairs the repair capacity of ECFCs in a severity-dependent manner.
• This endothelial progenitor cell dysfunction occurs within a context of increased inflammation and cellular senescence.
• Findings highlight the role of inflammation and senescence in reduced endothelial repair in ASCVD.