Summary
As a source of several vasoactive factors, the endothelium takes part in the regulation of vascular tone. The most important endothelium-derived vasoactive substances are nitric oxide, prostacyclin, endothelin-1 and contracting factors requiring the activity of cyclooxygenase. The endothelium is an obvious target organ of cardiovascular risk factors. Accordingly, functional alterations do occur with aging, hypertension, and lipids. All three conditions are associated with a decreased basal and stimulated release of endothelium-derived nitric oxide. On the other hand, the release of endothelin-1 appears to increase with age, while the sensitivity to the peptide markedly decreases under the same conditions. In the spontaneously hypertensive rat, acetylcholine and stretch evoke the release of cyclooxygenase-dependent endothelium-derived contracting factor, most likely prostaglandin H2. The sensitivity and circulating levels of endothelin-1, on the other hand, are reduced in this experimental model of hypertension. In the porcine coronary circulation, oxidized low-density lipoproteins selectively reduce endothelium-dependent relaxations to aggregating platelets, serotonin, and thrombin which are mediated by nitric oxide. The alterations of endothelial function occurring with aging, hypertension, and hyperlipidemia may have important clinical implications for the pathogenesis of cardiovascular disease.
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© 1991 Dr. Dietrich Steinkopff Verlag GmbH & Co. KG, Darmstadt
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Lüscher, T.F., Dohi, Y., Tanner, F.C., Boulanger, C. (1991). Endothelium-dependent control of vascular tone: effects of age, hypertension and lipids. In: Drexler, H., Zeiher, A.M., Bassenge, E., Just, H. (eds) Endothelial Mechanisms of Vasomotor Control. Steinkopff. https://doi.org/10.1007/978-3-642-72461-9_15
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