Abstract
Intermittent hypoxia (IH), the key property of obstructive sleep apnea (OSA), is closely associated with endothelial dysfunction. Endothelial-cell-specific molecule-1 (ESM-1, Endocan) is a novel, reported molecule linked to endothelial dysfunction. The aim of this study is to evaluate the effect of IH on ESM-1 expression and the role of ESM-1 in endothelial dysfunction. We found that serum concentration of ESM-1, inter-cellular adhesion molecule-1 (ICAM-1), and vascular cell adhesion molecule-1 (VCAM-1) is significantly higher in patients with OSA than healthy volunteers (p < 0.01). The expression of ESM-1, hypoxia-inducible factor-1 alpha (HIF-1α), and vascular endothelial growth factor (VEGF) was significantly increased in human umbilical vein endothelial cells (HUVECs) by treated IH in a time-dependent manner. HIF-1α short hairpin RNA and vascular endothelial growth factor receptor (VEGFR) inhibitor inhibited the expression of ESM-1 in HUVECs. ICAM-1 and VCAM-1 expressions were significantly enhanced under IH status, accompanied by increased monocyte-endothelial cell adhesion rate ( p < 0.001). Accordingly, ESM-1 silencing decreased the expression of ICAM-1 and VCAM-1 in HUVECs, whereas ESM-1 treatment significantly enhanced...Continue Reading
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