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(Hypertension. 2001;38:1227.)
© 2001 American Heart Association, Inc.
Fourth International Seminar on Cardiovascular Biology |
From the Centre dInvestigation Clinique INSERM-CHU and Department Of Cardiology (F.Z., F.A.) and the Department of Biochemistry (B.D.), Centre Hospitalier Universitaire, Equipe dAccueil EA 2403, University Henri Poincaré, Nancy, France,
Correspondence to Prof Faiez Zannad, Centre dInvestigation Clinique INSERM-CHU, Hôpital Jeanne dArc, 54200 Toul, France. E-mail cic{at}chu-nancy.fr
Abstract
Abstract Cardiac extracellular matrix undergoes extensive and continuous turnover involved in the lesion-reparation process, such as in cardiac remodeling, in hypertensive cardiac hypertrophy, in dilated cardiomyopathy, after myocardial infarction in the transition to heart failure, and during the progression of left ventricular dysfunction. Cardiac fibrosis is a major determinant of diastolic dysfunction and pumping capacity, and it may provide the structural substrate for arrhythmogenicity, thus potentially contributing the to progression of heart failure and sudden death. Aldosterone was shown to promote cardiac fibrosis in various experimental models. It was demonstrated that spironolactone may oppose the effect of aldosterone in promoting cardiac fibrosis. Measurement of cardiac collagen turnover by use of serological markers is a useful tool for monitoring cardiac tissue repair and fibrosis in experimental models or clinical conditions. We found that high serum levels of a marker of collagen turnover (procollagen type III N-terminal peptide ) in patients with chronic heart failure receiving conventional therapy, including ACE inhibitors, was associated with high mortality and hospitalization rates. In RALES (Randomized Aldactone Evaluation Study), in patients randomized to placebo, markers continued to increase or remained unchanged after 6-month follow-up. On the contrary, adding spironolactone 25 mg daily significantly decreased the levels of these serum markers during the same period. Most importantly, the spironolactone-related morbidity and mortality benefit was most predominant in subgroups with highest baseline levels of serum markers. These results suggest that limitation of the aldosterone-related excessive extracellular matrix turnover may be one of the various extrarenal mechanisms contributing to the beneficial effect of spironolactone in patients with chronic heart failure.
Key Words: aldosterone renin-angiotensin system collagen extracellular matrix heart failure
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