Ramipril inhibition of rabbit (Oryctolagus cuniculus) small intestinal brush border membrane angiotensin converting enzyme |
| |
| Authors: | B R Stevens M I Phillips A Fernandez |
| |
| Affiliation: | Department of Physiology, College of Medicine, University of Florida, Gainesville 32610. |
| |
| Abstract: | 1. Rabbit small intestinal brush border membranes possessed prominent angiotensin converting enzyme (ACE) activity. 2. Intestinal ACE was located on the lumen surface, as verified by ACE co-enrichment with brush border membrane marker enzymes. 3. Hydrolysis kinetics of rabbit intestinal ACE were comparable to the lung, utilizing the substrate (N-[3-(2-furyl)acryloyl]-L-phenylalanylglycylglycine; the Vmax = 543 +/- 51 mumol/min/g and Km = 0.62 +/- 0.09 mmol/l. 4. Intestinal brush border ACE activity was strongly inhibited by the antihypertensive drug Ramipril, which yielded an IC50 value of 5 nmol/l; the ACE activity remained completely inhibited during 15 days after a single dose of 10 mumol/l Ramipril. |
| |
| Keywords: | |
|
|
