Soluble E-selectin in essential hypertension: a correlate of vascular structural changes.

BACKGROUND: Increased expression of the endothelial leukocyte adhesion molecule E-selectin is implicated in vascular disease and may accompany the development of hypertension. We evaluated plasma soluble (s) E-selectin to assess its relationship with endothelium-dependent and endothelium-independent vasodilation in patients with hypertension.
METHODS: Thirty-one previously untreated and uncomplicated essential hypertensive patients were compared with 16 normotensive controls for changes in forearm blood flow (by strain-gauge plethysmography) in response to brachial artery infusion of the endothelium-dependent vasodilator acetylcholine, and of the endothelium-independent vasodilator sodium nitroprusside. As an index of structural changes, minimal forearm vascular resistances were calculated as the ratio between maximal vasodilation after 13 min of ischemia and mean blood pressure.
RESULTS: Responses to acetylcholine were significantly lower and minimal forearm vascular resistances higher in hypertensives versus controls, whereas responses to nitroprusside were comparable. Baseline sE-selectin concentrations were (mean +/- SEM) 37.4 +/- 1.8 ng/mL in hypertensives and 27.8 +/- 0.7 ng/mL in normotensives (P < .001). In essential hypertensive patients, a significant (P < .01) correlation with the response to nitroprusside (r = -0.47) was found, but not with the response to acetylcholine or minimal forearm vascular resistances. sE-selectin was also positively correlated with age and LDL cholesterol. At multivariate analysis, sE-selectin remained significantly correlated with nitroprusside responses and LDL cholesterol.
CONCLUSIONS: In patients with essential hypertension, plasma levels of sE-selectin are higher than in normotensive controls and mostly related to structural vascular changes.