Published online before print May 28, 2002, doi: 10.1161/01.CIR.0000018605.14470.DD
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(Circulation. 2002;105:2867.)
© 2002 American Heart Association, Inc.
Clinical Investigation and Reports |
Carvedilol Decreases Elevated Oxidative Stress in Human Failing Myocardium
From the Department of Cardiovascular Medicine, Okayama University Graduate School of Medicine and Dentistry, Okayama, and Department of Pathology and Biology of Diseases (S.T.), Graduate School of Medicine, Kyoto University, Kyoto, Japan.
Correspondence to Kazufumi Nakamura, MD, PhD, Department of Cardiovascular Medicine, Okayama University Graduate School of Medicine and Dentistry, 2-5-1 Shikata-cho, Okayama 700-8558, Japan. E-mail ichibun{at}cc.okayama-u.ac.jp
Background— Oxidative stress has been implicated in the pathogenesis of heart failure. However, direct evidence of oxidative stress generation in the human failing myocardium has not been obtained. Furthermore, the effect of carvedilol, a vasodilating ß-blocker with antioxidant activity, on oxidative stress in human failing hearts has not been assessed. This study was therefore designed to determine whether levels of lipid peroxides are elevated in myocardia of patients with dilated cardiomyopathy (DCM) and whether carvedilol reduces the lipid peroxidation level.
Methods and Results— Endomyocardial biopsy samples obtained from 23 patients with DCM and 13 control subjects with normal cardiac function were studied immunohistochemically for the expression of 4-hydroxy-2-nonenal (HNE)-modified protein, which is a major lipid peroxidation product. Expression of HNE-modified protein was found in all myocardial biopsy samples from patients with DCM. Expression was distinct in the cytosol of cardiac myocytes. Myocardial HNE-modified protein levels in patients with DCM were significantly increased compared with the levels in control subjects (P<0.0001). Endomyocardial biopsy samples from 11 patients with DCM were examined before and after treatment (mean, 9±4 months) with carvedilol (5 to 30 mg/d; mean dosage, 22±8 mg/d). After treatment with carvedilol, myocardial HNE-modified protein levels decreased by 40% (P<0.005) along with amelioration of heart failure.
Conclusions— Oxidative stress is elevated in myocardia of patients with heart failure. Administration of carvedilol resulted in a decrease in the oxidative stress level together with amelioration of cardiac function.
Key Words: cardiomyopathy • immunohistochemistry • myocardium
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