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Journal Article
Review
The clinical potential of endothelin receptor antagonists in cardiovascular medicine.
Drugs 1996 January
The endothelin family of peptides are extremely potent endogenous vasoconstrictor and pressor agents. Of the 3 isoforms, endothelin-1 is the major isoform produced by the vascular endothelium and is, therefore, likely to be of most importance for regulation of vascular function. Two endothelin receptor subtypes have so far been cloned in mammalian species; ET A, and ET B. Both receptor subtypes are found on smooth muscle cells and mediate the vasoconstrictor and pressor actions of endothelin. The ET B receptor is also found on vascular endothelial cells and mediates endothelin-dependent vasodilatation through release of nitric oxide and prostacyclin. Since their discovery in 1988, the endothelins have been the subject of intense research on their physiological function and potential pathophysiological role in cardiovascular disease. There is now good evidence that endothelin regulates vascular tone and blood pressure, and studies to support the development of endothelin receptor antagonists in conditions associated with chronic vasoconstriction, such as hypertension and heart failure, as well as in vasospastic disorders, such as subarachnoid haemorrhage and Raynaud's disease. There are now a number of selective ET A and combined ET A/B receptor antagonists available for preclinical studies. However, it is still not clear which of these will prove to be of most therapeutic value. Some of these agents are currently being assessed in early phase clinical trials. Endothelin receptor antagonists represent a novel therapeutic approach to a fundamental and newly discovered endogenous vasoconstrictor mechanism. The results of the current clinical trials are awaited with considerable interest.
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