Inhibition of neutral endopeptidase 3.4.24.11 in conscious dogs with pacing induced heart failure

• Published in: Cardiovascular research 1993-06, Vol.27 (6), p.1015-1023
• Main Authors: Seymour, Andrea A, Asaad, Magdi M, Lanoce, Vita M, Fennell, Susan A, Cheung, Hong S, Rogers, W Lynn
• Format: Article
• Language: English
• Subjects: Alanine - analogs & derivatives; Animals; Atrial Natriuretic Factor - blood; Atrial natriuretic peptide; Cardiac Pacing, Artificial; congestive heart failure; Cyclic GMP - metabolism; Dogs; Dose-Response Relationship, Drug; Female; Heart Failure - physiopathology; Hemodynamics - drug effects; Kidney - drug effects; Male; natriuresis; Natriuresis - drug effects; Neprilysin - antagonists & inhibitors; Neprilysin - pharmacology; neutral endopeptidase inhibitor; Protease Inhibitors - pharmacology; Urine
• ISSN: 0008-6363; 1755-3245
• DOI: 10.1093/cvr/27.6.1015

Objective: The effects of a selective neutral endopeptidase inhibitor, SQ 28,603 (N-[2-(mercaptomethy1)-l-oxo-3-phenylpropyl]-β-alanine), were determined in an experimental model of heart failure. Methods: The symptoms of heart failure were induced by rapid ventricular pacing for one or three weeks in dogs with surgically implanted catheters for measurement of atrial pressures and mean arterial pressure and with ultrasonic flow probes for determination of cardiac output and renal blood flow. Results: Inhibition of neutral endopeptidase by 10, 30, or 100 μmo1·kg−1 SQ 28,603 given intravenously increased sodium excretion, cyclic GMP excretion, and plasma concentrations of atrial natriuretic peptide in a dose related manner in conscious dogs paced for one week. SQ 28,603 (100 μmol·kg−1) stimulated similar natriuretic and cyclic GMP responses in dogs paced for three weeks although baseline glomerular filtration rate was reduced. Because the natriuresis was maintained despite the smaller filtered sodium load, the increase in fractional sodium excretion was significantly greater after three weeks of pacing (from 0.5(0.2) to 3.7(0.7)%) than after one week of tachycardia (from 0.1(0.0) to 2.0(0.3)%). By contrast, SQ 28,603 (100 μmol·kg−1) did not affect renal, haemodynamic, or hormonal variables in normal conscious dogs where baseline atrial natriuretic peptide (18(3) fmol·ml−1) was lower than in the paced animals (104(10) fmol·ml−1). Conclusions: Inhibition of neutral endopeptidase in dogs with pacing induced heart failure protected endogenous atrial natriuretic peptide from degradation and stimulated sustained natriuresis, presumably via a tubular mechanism. Cardiovascular Research 1993;27:1015-1023