Characterisation of progenitor cells in human atherosclerotic vessels

Area of Science:

• Vascular Biology
• Atherosclerosis Research
• Stem Cell Biology

Background:

• Animal models indicate endothelial and smooth muscle progenitor cells drive atherosclerosis.
• The presence and role of progenitor cells in human atherosclerotic vessels remain uncharacterized.

Purpose of the Study:

• To investigate the existence and characteristics of vascular progenitor cells in human atherosclerotic arteries.
• To quantify progenitor cell presence in normal versus atherosclerotic human vessels.

Main Methods:

• Human arterial segments (internal mammary artery, aorta) from bypass surgery patients were analyzed.
• Immunofluorescence staining was employed to detect progenitor cell markers (CD34, Sca-1, c-kit, VEGFR2, CD133).

Main Results:

• Vascular progenitor cells were identified in neointimal lesions and adventitia of atherosclerotic arteries.
• A two- to three-fold increase in adventitial progenitor cells was observed in atherosclerotic vessels compared to controls.
• Increased frequency of VEGFR2-expressing cells was noted in atherosclerotic adventitia (p<0.05).

Conclusions:

• This study provides the first evidence of vascular progenitor cells within human atherosclerotic lesions.
• An elevated number of progenitor cells in the adventitia of human atherosclerotic vessels suggests a role in disease progression.
• These progenitor cells may serve as a source for smooth muscle cells, macrophages, and endothelial cells in atherosclerotic plaques.