Impaired endothelial progenitor cell function predicts age-dependent carotid intimal thickening
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We investigated whether qualitative or quantitative alterations of the endothelial progenitor cell (EPC) pool predict age-related structural vessel wall changes.
We have previously shown that age-related endothelial dysfunction is accompanied by qualitative rather than quantitative changes of EPCs. Animal studies suggest that impaired EPC functions lead to accelerated arterial intimal thickening.
Intima-media thickness (IMT) was measured in the common carotid artery in our previously published groups of younger (25 ± 1 years, n = 20) and older (61 ± 2 years, n = 20) healthy non-smoking volunteers without arterial hypertension, hypercholesterolemia, and diabetes mellitus. Endothelial progenitor cells (EPCs, KDR+/CD34+ and KDR+/CD133+) were counted in peripheral blood using flow cytometry. In ex vivo expanded EPCs, the function was determined as chemotaxis to VEGF, proliferation, and survival.
We observed thicker IMT in older as compared to younger subjects (0.68 ± 0.03 mm Vs. 0.48 ± 0.02 mm, P < 0.001). Importantly, there were significant inverse univariate correlations between IMT, EPC chemotaxis, and survival (r = −0.466 P < 0.05; r = −0.463, P < 0.01). No correlation was observed with numbers of circulating EPCs. Multivariate regression analysis revealed that age, mean arterial pressure and migration of EPCs were independent predictors of IMT (R 2 = 0.58).
Impaired EPC function may lead to accelerated vascular remodeling due to chronic impairment of endothelial maintenance.
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- Impaired endothelial progenitor cell function predicts age-dependent carotid intimal thickening
Basic Research in Cardiology
Volume 103, Issue 6 , pp 582-586
- Cover Date
- Print ISSN
- Online ISSN
- D. Steinkopff-Verlag
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- Intima-media thickness
- endothelial progenitor cells
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- Author Affiliations
- 1. Medical Clinic I, Dept. of Medicine, Division of Cardiology, Pulmonology, and Vascular Medicine, RWTH University Hospital Aachen, Pauwelstraße 30, 52074, Aachen, Germany
- 2. Dept. of Vascular Medicine, Swiss Cardiovascular Center, Inselspital, University Hospital, Bern, Switzerland
- 3. Division of Cardiology, University of California, San Francisco, CA, USA