The endothelium modulates vascular tone by the release of constricting and relaxing substances that act on the underlying smooth muscle. This regulatory activity of the endothelium is dysfunctional in a number of cardiovascular conditions, including essential hypertension and hypercholesterolemia. Previous studies from our group have implicated a decreased action of endothelium-derived nitric oxide (NO) as the mechanism responsible for this abnormality. Whether this reduced bioactivity of NO is related to vasoactive prostanoids remains uncertain.

We propose to test the hypothesis that an increased production of vasoactive prostanoids by the cyclooxygenase (COX) system is responsible for the reduced bioactivity of NO in essential hypertension and hypercholesterolemia. We will investigate the effect of COX inhibition by aspirin (ASA) on resting vascular tone, and on both endothelium-dependent and independent vasodilation in normal subjects, hypertensive patients, and hypercholesterolemic patients.

For this purpose, we propose to analyze the regional vascular responses to acetylcholine (ACH) and to sodium nitroprusside (SNP) before and after the administration of ASA. We will also analyze the basal forearm blood flow (FBF) responses to increasing doses of ASA infusion. We will employ infusion of drugs into the brachial artery and we will measure the responses of the forearm vasculature by means of strain gauge plethysmography.