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• W1511221661 abstract "In a previous study, we found that atriopeptin I was much weaker (EC50 greater than 500 nM) than atrial natriuretic factor (ANF-(8-33)) (EC50 = 0.3 nM) at increasing cyclic GMP in cultured endothelial cells. In this study, we used the cross-linking reagent disuccinimidyl suberate to investigate whether the differences in activity were due to the presence of multiple ANF receptors. When 98% of the ANF-binding sites on endothelial cells were occupied by tyrosine-atriopeptin I after cross-linking, there was no difference in the concentration-response curve to ANF-(8-33) with regard to cyclic GMP accumulation. In contrast, when 96% of the binding sites were occupied by cross-linked ANF-(8-33), a 60% decrease in the maximal cyclic GMP response was observed after the readdition of ANF-(8-33). These results suggest that ANF-(8-33) is binding to an additional site that atriopeptin I does not effectively bind. Affinity cross-linking of 125I-ANF to intact endothelial cells resulted in the labeling of two sites of Mr approximately 66,000 and approximately 130,000. Approximately 94% of the 125I-ANF binding sites had an Mr approximately 66,000. Labeling of this site was inhibited by both tyrosine-atriopeptin I (KI = 0.9 nM) and ANF-(8-33) (KI = 0.09 nM). Although 0.1 microM tyrosine-atriopeptin (AP I) inhibited labeling of the 66,000-dalton site to nearly the same degree as ANF-(8-33), it produced only a 4-fold increase in cyclic GMP compared to a 400-fold increase with ANF-(8-33). These results suggest that the 66,000-dalton site is not coupled to guanylate cyclase and cyclic GMP formation. Tyrosine-AP I (KI greater than 10 nM) was much weaker at competing for the 130,000-dalton site than ANF-(8-33) (KI = 0.075 nM). Because the EC50 for cyclic GMP stimulation for tyrosine-AP I (greater than 100 nM) and ANF-(8-33) (0.4 nM) is closer to the KI values for the 130,000-dalton protein, this site probably mediates the marked stimulation of cyclic GMP. Our results demonstrate that endothelial cells contain two binding sites for ANF-(8-33) and suggest that only the less abundant site (Mr approximately 130,000) is the receptor coupled to the activation of guanylate cyclase." @default.
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• W1511221661 date "1986-09-01" @default.
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• W1511221661 title "Identification of multiple binding sites for atrial natriuretic factor by affinity cross-linking in cultured endothelial cells." @default.
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• W1511221661 doi "https://doi.org/10.1016/s0021-9258(18)67292-8" @default.
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