Circulation Research. 2001
Published online before print April 27, 2001, doi: 10.1161/hh0901.089882
Published online before print April 27, 2001, doi: 10.1161/hh0901.089882
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© 2001 American Heart Association, Inc.
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Cardiac Angiotensin II Formation in the Clinical Course of Heart Failure and Its Relationship With Left Ventricular Function
From Clinica Medica Generale e Cardiologia (G.G.N.S., M.B., I.C., S.V., M.C., M.L.P., B.B., I.B., G.P., P.A.M.), University of Florence, and Institute of Thoracic and Cardiovascular Surgery (T.T., M.M.), University of Siena, Italy.
Correspondence to Gian Gastone Neri Serneri, MD, Clinica Medica Generale e Cardiologia, University of Florence, Viale Morgagni 85, 50134 Florence, Italy.
Abstract
Abstract—In 76 patients with heart failure (HF) (New York Heart Association [NYHA] classes I through IV) and in 15 control subjects, cardiac angiotensin II (Ang II) generation and its relationship with left ventricular function were investigated by measuring aorta–coronary sinus concentration gradients of endogenous angiotensins and in a part of patients by studying 125I-labeled Ang I kinetics. Gene expression and cellular localization of the cardiac renin-angiotensin system components, the density of AT1 and AT2 on membranes and isolated myocytes, and the capacity of isolated myocytes for synthesizing the hypertrophying growth factors insulin-like growth factor-I (IGF-I) and endothelin (ET)-1 were also investigated on 22 HF explanted hearts (NYHA classes III and IV) and 7 nonfailing (NF) donor hearts. Ang II generation increased with progression of HF, and end-systolic wall stress was the only independent predictor of Ang II formation. Angiotensinogen and angiotensin-converting enzyme mRNA levels were elevated in HF hearts, whereas chymase levels were not, and mRNAs were almost exclusively expressed on nonmyocyte cells. Ang II was immunohistochemically detectable both on myocytes and interstitial cells. Binding studies showed that AT1 density on failing myocytes did not differ from that of NF myocytes, with preserved AT1/AT2 ratio. Conversely, AT1 density was lower in failing membranes than in NF ones. Ang II induced IGF-I and ET-1 synthesis by isolated NF myocytes, whereas failing myocytes were unable to respond to Ang II stimulation. This study demonstrates that (1) the clinical course of HF is associated with progressive increase in cardiac Ang II formation, (2) AT1 density does not change on failing myocytes, and (3) failing myocytes are unable to synthesize IGF-I and ET-1 in response to Ang II stimulation.
Key Words: angiotensins • congestive heart failure • AT receptors • failing myocytes • cardiomyopathy
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