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lüll Critical role of the nitric oxide/reactive oxygen species balance in endothelial progenitor dysfunction Fleissner F; Thum TAntioxid Redox Signal 2011[Aug]; 15 (4): 933-48Endothelial injury and dysfunction are critical events in the pathogenesis of cardiovascular disease. During these processes, an impaired balance of nitric oxide bioavailability and oxidative stress is mechanistically involved. Circulating angiogenic cells (including early and late outgrowth endothelial progenitor cells (EPC)) contribute to formation of new blood vessels, neovascularization, and homeostasis of the vasculature, and are highly sensitive for misbalance between NO and oxidative stress. We here review the role of the endothelial nitric oxide synthase and oxidative stress producing enzyme systems in EPC during cardiovascular disease. We also focus on the underlying molecular mechanisms and potential emerging drug- and gene-based therapeutic strategies to improve EPC function in cardiovascular diseased patients.|Cardiovascular Diseases/metabolism[MESH]|Endothelium, Vascular/*metabolism[MESH]|Humans[MESH]|Neovascularization, Physiologic[MESH]|Nitric Oxide Synthase/metabolism[MESH]|Nitric Oxide/*metabolism[MESH]|Oxidative Stress/physiology[MESH]|Reactive Oxygen Species/*metabolism[MESH]|Stem Cells/*metabolism[MESH] |