Angiogenic T-Cells and Putative Endothelial Progenitor Cells in Hypertension-Related Cerebral Small Vessel Disease

Background and Purpose— Cerebral small vessel disease (CSVD) may be caused by endothelial dysfunction, whereas endothelial progenitor cells (EPC) may attenuate endothelial dysfunction. Their vitality is lower in CSVD. A subset of lymphocytes, angiogenic T-cells, is capable to stimulate EPC function. The purpose of our study was to explore the relation between CSVD manifestations, angiogenic T-cells, and EPC in hypertensive patients with CSVD. Methods— We compared 32 essential hypertensive patients with CSVD (white matter lesions, asymptomatic lacunar infarcts, or microbleeds on 1.5-Tesla MRI) to 29 age-matched and sex-matched hypertensive controls. We counted angiogenic T-cells (CD3 + /CD31 + /CD184 + ) and putative EPC (CD31 + /CD34 + /CD45 - /KDR + ) by flow cytometry and determined EPC vitality by in vitro cluster formation. Results— Putative EPC numbers were lower in hypertensive individuals with CSVD than in those without (10±7 . 10 3 /mL versus 13±6 . 10 3 /mL [median±interquartile range]; P =0.011). Angiogenic T-cell numbers were also lower in hypertensive individuals with CSVD than in those without (0.56±0.25 . 10 9 /mL versus 0.78±0.50 . 10 9 /mL; P =0.008). Higher angiogenic T-cell numbers independently related to absence of CSVD (odds ratio, 0.088; 95% confidence interval, 0.012–0.627). Conclusions— Our data suggest that angiogenic T-cells and putative EPC independently relate to radiological CSVD manifestations in hypertensive patients.