Abstract
This study was designed to examine whether endothelin is released from the intima of intact arteries, and whether endothelium-derived nitric oxide regulates its production. Endothelin was detected in the incubating medium of unstimulated pig aortae with, but not in those without endothelium. In preparations with endothelium, thrombin (2-6 U/ml) and the calcium ionophore A23187 (10(-6) M) stimulated the release of the peptide. The basal and thrombin-stimulated production of endothelin were prevented by the protein synthetase inhibitor cycloheximide (10(-6) M). The production of endothelin upon stimulation with thrombin (4 U/ml) was potentiated by L-NG-monomethyl arginine and methylene blue and reduced by superoxide dismutase and 8-bromo cyclic guanosine 5'-monophosphate (GMP), while the basal release of the peptide was unaffected. Thus, (a) endothelin is released from the intimal layer of intact blood vessels, both under basal conditions and after stimulation with thrombin and the calcium ionophore A23187, and (b) endothelium-derived nitric oxide released during stimulation with thrombin inhibits the production of the peptide via a cyclic GMP-dependent pathway.
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