Abstract
Prehypertension is associated with significant damage to the coronary vasculature and increased rates of adverse cardiovascular events. Circulating endothelial progenitor cells (EPCs) are critical to vascular repair and the formation of new blood vessels. We tested the hypothesis that prehypertension is associated with EPC dysfunction. Peripheral blood samples were collected from 83 middle-aged and older adults (51 male and 32 female): 40 normotensive subjects (age 53±2 years; BP 111/74±1/1 mm Hg) and 43 prehypertensive subjects (age 54±2 years; 128/77±1/1 mm Hg). EPCs were isolated from peripheral blood, and EPC colony-forming capacity (colony-forming unit (CFU) assay), migratory activity (Boyden chamber) and apoptotic susceptibility (active caspase-3 concentrations) were determined. There were no significant differences in the number of EPC CFUs (10±2 vs 9±1), EPC migration (1165±82 vs 1120±84 fluorescent units) or active intracellular caspase-3 concentrations (2.7±0.3 vs 2.3±0.2 ng ml−1) between the normotensive and prehypertensive groups. When groups were stratified into low prehypertension (n=27; systolic blood pressure: 120–129 mm Hg) and high prehypertension (n=16; 130–139 mm Hg), it was found that EPCs from the high prehypertensive group produced fewer (∼65%, P<0.05) CFUs compared with the low prehypertensive (4±1 vs 12±2) and normotensive adults. In conclusion, EPC colony-forming capacity is impaired only in prehypertensive adults with systolic BP greater than 130 mm Hg. Prehypertension is not associated with migratory dysfunction or enhanced apoptosis of EPCs.
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Acknowledgements
We would like to thank all the subjects who participated in the study, as well as Yoli Casas and Jeremy Stoner for their technical assistance. This study was supported by the National Institutes of Health Awards HL068030, DK062061, HL076434 and MO1 #RR00051.
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MacEneaney, O., DeSouza, C., Weil, B. et al. Prehypertension and endothelial progenitor cell function. J Hum Hypertens 25, 57–62 (2011). https://doi.org/10.1038/jhh.2010.31
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DOI: https://doi.org/10.1038/jhh.2010.31
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