Abstract | OBJECTIVES: DESIGN AND METHODS: In-vitro NEP and ACE inhibition was studied by radioinhibitory binding assay using rat renal membranes and the specific NEP inhibitor radioligand 125I-RB104 and the specific ACE inhibitor radioligand 125I-MK351A, respectively (n = 3 per curve). In-vivo NEP and ACE inhibition was studied using in-vitro autoradiography in rats that received oral gemopatrilat (1, 3, 10 mg/kg; n = 4 per dose) and were killed 1 h later, or received oral gemopatrilat (3, 10 mg/kg) and were killed at time points 1, 2, 4, 8, 18, 24 and 48 h (n = 4 per time point). RESULTS:
Gemopatrilat caused a concentration-dependent displacement of specific radioligands from renal membrane NEP (IC50 305 +/- 5.4 nmol/I) and ACE (IC50 3.6 +/- 0.02 nmol/). In the dose-response study gemopatrilat (1, 3 and 10 mg/kg) caused significant inhibition of plasma ACE (P< 0.01), and renal ACE and NEP (3, 10 mg/kg, P < 0.01). In the time course experiment, gemopatrilat (10 mg/kg) increased plasma renin activity for 8 h (P< 0.01) and inhibited plasma ACE (P< 0.05), renal NEP (P< 0.01) and renal ACE (P< 0.05) for 48 h. CONCLUSIONS:
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Authors | R A Hubner, E Kubota, D J Casley, C I Johnston, L M Burrell |
Journal | Journal of hypertension
(J Hypertens)
Vol. 19
Issue 5
Pg. 941-6
(May 2001)
ISSN: 0263-6352 [Print] England |
PMID | 11393678
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Angiotensin-Converting Enzyme Inhibitors
- Dipeptides
- Enzyme Inhibitors
- Iodine Radioisotopes
- Iodobenzenes
- Protease Inhibitors
- L-proline, N2-((1S)-1-carboxy-3-phenylpropyl)-N6-((4-hydroxyphenyl)iminomethyl)-L-lysyl-
- RB 104
- gamma-Aminobutyric Acid
- Neprilysin
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Topics |
- Administration, Oral
- Angiotensin-Converting Enzyme Inhibitors
(pharmacology)
- Animals
- Binding, Competitive
- Dipeptides
(metabolism)
- Dose-Response Relationship, Drug
- Enzyme Inhibitors
(pharmacology)
- In Vitro Techniques
- Iodine Radioisotopes
- Iodobenzenes
(metabolism)
- Male
- Neprilysin
(antagonists & inhibitors)
- Protease Inhibitors
(pharmacology)
- Rats
- Rats, Sprague-Dawley
- Time Factors
- gamma-Aminobutyric Acid
(analogs & derivatives, metabolism)
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