title: Dual inhibition of angiotensin-converting enzyme and neutral endopeptidase in rats with hypertension.
abstract: Angiotensin converting enzyme (ACE) and neutral endopeptidase (NEP), are two mechanistically similar enzymes involved in the metabolism of several vasoactive peptides. Selective inhibitors of ACE are effective antihypertensive agents in high-renin, renovascular rats and normal-renin, spontaneously hypertensive rats (SHR), but are not effective in the low-renin, deoxycorticosterone acetate (DOCA)-salt hypertensive rats. In contrast, NEP inhibitors are only effective in the low-renin model of hypertension. Treatment with a combination of selective inhibitors or with a dual inhibitor of both enzymes produces an antihypertensive response regardless of basal plasma renin activity. In this study, we compared the activities of MDL 100,173, a novel subnanomolar inhibitor of both ACE and NEP, with those of equimolar doses of captopril, a selective ACE inhibitor, following intravenous administration in these three rat models of hypertension. Treatment with MDL 100,173 significantly lowered blood pressure compared to vehicle treatment in all three models, whereas captopril treatment lowered blood pressure in the renovascular and SHR models only. Administration of MDL 100,173 also significantly elevated diuresis and natriuresis compared to either vehicle or captopril treatment in the SHR and DOCA-salt rats. Urinary excretion of atrial natriuretic peptide (ANP) was increased by MDL 100,173 treatment in all three models of hypertension. Treatment with captopril did not alter urine, sodium, or ANP excretion in any of the models. However, plasma-renin activity was elevated by both MDL 100,173 and captopril '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' ''''''''
authors.affiliation: Marion Merrell Dow Research Institute, Cincinnati, Ohio, USA.
authors.forename: J F
authors.initials: JF
authors.lastname: French
authors.forename: B A
authors.initials: BA
authors.lastname: Anderson
authors.forename: T R
authors.initials: TR
authors.lastname: Downs
authors.forename: R C
authors.initials: RC
authors.lastname: Dage
mesh_terms: D000806:Angiotensin-Converting Enzyme Inhibitors / Q000008:administration & dosage / Q000494:pharmacology / Q000627:therapeutic use*; D000818:Animals; D000959:Antihypertensive Agents / Q000008:administration & dosage / Q000494:pharmacology / Q000627:therapeutic use; D009320:Atrial Natriuretic Factor / Q000652:urine; D001552:Benzazepines / Q000008:administration & dosage / Q000494:pharmacology / Q000627:therapeutic use*; D001794:Blood Pressure / Q000187:drug effects; D002216:Captopril / Q000008:administration & dosage / Q000494:pharmacology / Q000627:therapeutic use; D004195:Disease Models, Animal; D004231:Diuresis / Q000187:drug effects; D006973:Hypertension / Q000188:drug therapy* / Q000201:enzymology; D006977:Hypertension, Renal / Q000188:drug therapy; D008297:Male; D015260:Neprilysin / Q000037:antagonists & inhibitors*; D011480:Protease Inhibitors / Q000008:administration & dosage / Q000494:pharmacology / Q000627:therapeutic use*; D011725:Pyridines / Q000008:administration & dosage / Q000494:pharmacology / Q000627:therapeutic use*; D051381:Rats; D011918:Rats, Inbred SHR; D017207:Rats, Sprague-Dawley; D012964:Sodium / Q000652:urine
chemical_list: D000806:Angiotensin-Converting Enzyme Inhibitors; D000959:Antihypertensive Agents; D001552:Benzazepines; D011480:Protease Inhibitors; D011725:Pyridines; C085684:MDL 100173; D009320:Atrial Natriuretic Factor; D002216:Captopril; D012964:Sodium; D015260:Neprilysin