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- W2331667319 abstract "Summary Angiotensin-converting enzyme (ACE) has two enzymatically active domains: a C-domain in the carboxy terminal region and an N-domain in the amino terminal region. We based the pharmacologic characterization of these sites on the rat testis-lung model. In testis, only a truncate form of ACE is present (C-site), whereas both N- and C-sites are present in lung. In this model, captopril was shown to be N-selective and delaprilat to be C-selective. Ro 31-8472, a cilazapril derivative, and enalaprilat proved to be not site selective. We used these drugs to evaluate the affinity of C and N sites in various human tissues involved in the cardiovascular actions of ACE and used [125I]Ro31-8472 as ligand. The number and affinity of ACE binding sites were 17,680 ± 2,345 fmol/mg protein (Kd = 0.32 ± 0.04 nM) in lung, 560 ± 65 (Kd = 0.36 ± 0.05 nM) in heart, 237 ± 51 (Kd = 0.37 0.06 nM) in coronary artery, 236 ± 63 (Kd = 0.14 ± 0.05 nM) in saphenous vein, and 603 ± 121 (Kd = 0.50 ± 0.06 nM) in mammary artery. The affinity (pKi) of captopril for the N sites ranged from 9.40 ± 0.14 (lung) to 8.41 ± 0.10 (coronary artery). The affinity for the C-site by delaprilat ranged from 9.97 ± 0.15 (coronary artery) to 9.10 ± 0.14 (mammary artery). Therefore, the affinity of C- and N- sites of ACE for ACE inhibitor (ACEI) drugs is different according to the organ involved. Because ACE is a glycosylated enzyme and glycosylation is organ dependent, we suggest that organ-specific glycosylation affects the binding characteristics of ACE inhibitors to N- or C-site of human tissular ACE." @default.
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- W2331667319 date "1996-10-01" @default.
- W2331667319 modified "2023-10-14" @default.
- W2331667319 title "Affinity of Angiotensin I-Converting Enzyme (ACE) Inhibitors For N- and C-Binding Sites of Human ACE Is Different in Heart, Lung, Arteries, and Veins" @default.
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- W2331667319 doi "https://doi.org/10.1097/00005344-199610000-00003" @default.
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