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Research Article Free access | 10.1172/JCI114226
Department of Internal Medicine, University of South Florida College of Medicine, Tampa 33612.
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Department of Internal Medicine, University of South Florida College of Medicine, Tampa 33612.
Find articles by Gomez-Sanchez, C. in: JCI | PubMed | Google Scholar
Department of Internal Medicine, University of South Florida College of Medicine, Tampa 33612.
Find articles by Foecking, M. in: JCI | PubMed | Google Scholar
Department of Internal Medicine, University of South Florida College of Medicine, Tampa 33612.
Find articles by Chiou, S. in: JCI | PubMed | Google Scholar
Published September 1, 1989 - More info
Endothelins are a group of potent vasoconstrictors whose structure was deduced from genomic DNA. ET-1 was first isolated from culture supernatants from porcine endothelial cells and ET-3 was identified from a rat DNA library. We report on the binding of 125I-ET-1 to zona glomerulosa cells in culture and on its ability to stimulate aldosterone secretion. Cultured calf adrenal zona glomerulosa cells have saturable, high affinity [Kd = 1.00 +/- 0.17 X 10(-10) M (SEM)] receptors which bind ET-1 in a temperature and time dependent manner. Binding was specific and angiotensin II, vasopressin, ANP, BNP, apamin, calcium channel agonists or antagonists did not interact with the receptor. ET-3 displaced 125I-ET-1 from the receptor with a relative potency of 0.39 +/- 0.1% (SEM) that of ET-1. ET-1 incubated with cultured glomerulosa cells stimulated aldosterone secretion in a dose dependent manner but it was less potent than angiotensin II. ET-3 had less than 1% the relative potency of ET-1 stimulating aldosterone secretion. This data suggest that ET-1 is an independent stimulator of aldosterone secretion and we are speculating that it might be important in those situations, like in malignant hypertension, where endothelial damage might result in increased ET-1 production.
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