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Circulation. 2002;105:1548-1550
Published online before print March 18, 2002, doi: 10.1161/01.CIR.0000013847.07035.B9
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(Circulation. 2002;105:1548.)
© 2002 American Heart Association, Inc.


Brief Rapid Communications

Angiotensin-(1–7) Attenuates the Development of Heart Failure After Myocardial Infarction in Rats

Annemarieke E. Loot, MSc; Anton J.M. Roks, PhD; Robert H. Henning, MD, PhD; René A. Tio, MD, PhD; Albert J.H. Suurmeijer, MD, PhD; Frans Boomsma, PhD; Wiek H. van Gilst, PhD

From the Department of Clinical Pharmacology, University of Groningen (A.E.L., A.J.M.R., R.H.H., W.H.v.G.); Departments of Cardiology (R.A.T., W.H.v.G.) and Pathology (A.J.H.S.), University Hospital Groningen; and Department of Internal Medicine, Erasmus University Medical Center, Rotterdam (F.B.), the Netherlands.

Correspondence to A.E. Loot, A. Deusinglaan 1, 9713 AV Groningen, The Netherlands. E-mail a.e.loot{at}med.rug.nl

Background The renin-angiotensin system (RAS) is a key player in the progression of heart failure. Angiotensin-(1–7) is thought to modulate the activity of the RAS. Furthermore, this peptide may play a part in the beneficial effects of angiotensin-converting enzyme inhibitors in cardiovascular disease. We assessed the effects of angiotensin-(1–7) on the progression of heart failure.

Methods and Results Male Sprague-Dawley rats underwent either coronary ligation or sham surgery. Two weeks after induction of myocardial infarction, intravenous infusion of angiotensin-(1–7) (24 µg/kg per hour) or saline was started by minipump. After 8 weeks of treatment, hemodynamic parameters were measured, endothelial function was assessed in isolated aortic rings, and plasma angiotensin-(1–7) levels were determined. Myocardial infarction resulted in a significant deterioration of left ventricular systolic and diastolic pressure, dP/dt, and coronary flow. Raising plasma levels 40-fold, angiotensin-(1–7) infusion attenuated this impairment to a nonsignificant level, markedly illustrated by a 40% reduction in left ventricular end-diastolic pressure. Furthermore, angiotensin-(1–7) completely preserved aortic endothelial function, whereas endothelium-dependent relaxation in aortas of saline-treated infarcted rats was significantly decreased.

Conclusions Angiotensin-(1–7) preserved cardiac function, coronary perfusion, and aortic endothelial function in a rat model for heart failure.


Key Words: angiotensin • heart failure • hemodynamics • myocardial infarction




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