Endothelium-dependent hyperpolarization: a role in the control of vascular tone
- PMID: 7732600
- DOI: 10.1016/s0165-6147(00)88969-5
Endothelium-dependent hyperpolarization: a role in the control of vascular tone
Erratum in
- Trends Pharmacol Sci 1995 May;16(5):177
Abstract
Endothelial-dependent relaxation of vascular smooth muscle cells evoked by a number of agonists, including cholinomimetics and substance P, is often accompanied by an increase (repolarization and/or hyperpolarization) in the membrane potential. This change in membrane potential appears predominantly to reflect the action of an endothelial-derived hyperpolarizing factor (EDHF), which is distinct from NO (or endothelial-derived relaxing factor), and is discussed in this article by Chris Garland and colleagues. In large conducting arteries, EDHF may provide a secondary system to NO, which assumes primary importance in some disease states such as pulmonary hypertension and atherosclerosis. However, in small resistance arteries (100-300 microns), EDHF appears to be a major determinant of vascular calibre under normal conditions, and may therefore be of primary importance in the regulation of vascular resistance.
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