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(Hypertension. 2001;38:665.)
© 2001 American Heart Association, Inc.

Renin-Angiotensin System

Angiotensin-(1-7): Cardioprotective Effect in Myocardial Ischemia/Reperfusion

Anderson J. Ferreira; Robson A.S. Santos; Alvair P. Almeida

Department of Physiology and Biophysics, Biological Sciences Institute, Federal University of Minas Gerais, Belo Horizonte, MG, Brazil.

Correspondence to Alvair P. Almeida, PhD, Departamento de Fisiologia e Biofísica, Av. Antônio Carlos, 6627 -ICB-UFMG, 31 270-901-Belo Horizonte, MG, Brasil. E-mail apa{at}mono.icb.ufmg.br

Abstract

Abstract—— In this study we evaluate the effects of angiotensin-(1-7) on reperfusion arrhythmias in isolated rat hearts. Rat hearts were perfused according to Langendorff technique and maintained in heated (37±1°C) and continuously gassed (95% O₂/5% CO₂) Krebs-Ringer solution at constant pressure (65 mm Hg). The electrical activity was recorded with an ECG (bipolar). Local ischemia was induced by coronary ligation for 15 minutes. After ischemia, hearts were reperfused for 30 minutes. Cardiac arrhythmias were defined as the presence of ventricular tachycardia and/or ventricular fibrillation after the ligation of the coronary artery was released. Angiotensin II (0.20 nmol/L, n=10) produced a significant enhancement of reperfusion arrhythmias. On the other hand, Ang-(1-7) presented in the perfusion solution (0.22 nmol/L, n=11) reduced incidence and duration of arrhythmias. The antiarrhythmogenic effects of Ang-(1-7) was blocked by the selective Ang-(1-7) antagonist A-779 (2 nmol/L, n=9) and by indomethacin pretreatment (5 mg/kg IP, n=8) but not by the bradykinin B₂ antagonist HOE 140 (100 nmol/L, n=10) or by L-NAME pretreatment (30 mg/kg IP, n=8). These results suggest that the antiarrhythmogenic effect of low concentrations of Ang-(1-7) is mediated by a specific receptor and that release of endogenous prostaglandins .by Ang-(1-7) contributes to the alleviation of reversible and/or irreversible ischemia-reperfusion injury.

Key Words: heart • angiotensin II • angiotensin antagonist • renin-angiotensin system • nitric oxide • prostaglandins

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