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In hypertensive rats without generalized vascular overexpression, however, expression of ET-1 was often enhanced in intramyocardial coronary arteries, suggesting a role of endothelin in myocardial ischemia in hypertension. In rats overexpressing ET-1, ET<jats:sub>A\/B<\/jats:sub>and ET<jats:sub>A<\/jats:sub>-selective receptor antagonists lowered blood pressure and reduced vascular growth, particularly in small arteries, beyond what could be attributed to blood pressure lowering, suggesting a direct effect of ET-1 on growth. Hypertensive rats treated with endothelin antagonists are protected from stroke and renal injury. The ET<jats:sub>A\/B<\/jats:sub>antagonist bosentan induced blood-pressure reductions in mildly hypertensive patients similar to those achieved with an angiotensin-converting enzyme inhibitor. Moderately to severely hypertensive patients presented with enhanced expression of prepro-ET-1 mRNA in the endothelium of subcutaneous resistance arteries, suggesting that these stages of hypertension may respond particularly well to endothelin antagonism. Hypertensive patients with coronary artery disease have increased arterial expression of ET-1, and increased plasma levels of immunoreactive endothelin have been described in black patients. ET-1 plays an important role in atherosclerosis, for which hypertension is an important risk factor. Thus, ET-1 may be involved in experimental and human hypertension. Endothelin antagonists may prove effective as disease-modifying agents if they are shown clinically, as they are experimentally, to offer target organ protection and reduce long-term complications of hypertension. 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