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Correspondence

Specific Removal of β1-Adrenergic Autoantibodies from Patients with Idiopathic Dilated Cardiomyopathy

N Engl J Med 2002; 347:1806November 28, 2002

Article

To the Editor:

The pathophysiologic relevance of autoantibodies against cardiac proteins in the induction or maintenance of idiopathic dilated cardiomyopathy is still unclear. It has been shown that induction of antibodies against cardiac β1-adrenergic–receptor structures in rabbits leads to significant cardiac dilatation.1,2 Examinations of cardiac myocytes from neonatal rats have shown that this antibody type isolated from patients with idiopathic dilated cardiomyopathy acts like a β-adrenergic agonist.3 Removal of class G immunoglobulins from plasma has been shown to improve cardiac performance within one year after immunoadsorption in patients with idiopathic dilated cardiomyopathy.4 Since immunoadsorption removes a whole class of immunoglobulins, all autoantibodies of that particular class were eliminated. We report the effect on cardiac performance of selective elimination of autoantibodies against the β1-adrenergic receptor after one year in eight patients. The prevalence of these autoantibodies in patients with idiopathic dilated cardiomyopathy is about 80 percent.4

Specific immunoadsorption was performed with peptide columns (Coraffin, Affina). The peptides mimic the autoantibody-binding epitopes of the β1-adrenergic receptor. All eight patients (one woman and seven men; mean [±SE] age, 49.4±9.4 years; mean duration of heart failure, 7.7±7.0 years) had idiopathic dilated cardiomyopathy: on base-line echocardiography, the two-dimensional left ventricular ejection fraction was 28.5±6.1 percent; the left ventricular diastolic dimension, 69.3±8.5 mm; and the maximal wall-motion velocity in systole, 4.9±0.6 cm per second. All the patients had been receiving full, standard medication for heart failure for at least six months, including beta-blockers, angiotensin-converting–enzyme inhibitors, and aldosterone antagonists. Autoantibody removal was performed on five consecutive days, with a reduction from 5.0±0.5 laboratory units (LU) at base line to 1.2±0.6 LU after five days. After one year, the ejection fraction had increased to 36.6.±10.7 percent (95 percent confidence interval of the P value, 0.002 to 0.02 by the Wilcoxon test with bootstrapping simulation); the left ventricular dimension had become 65.6±14.2 mm (P value, 0.10 to 0.12 for the comparison with base line), and maximal wall velocity had increased to 7.2±2.2 cm per second (P value, 0.006 to 0.01 for the comparison with base line). The autoantibody level remained at 0.6±0.6 LU (P value, 0.001 to 0.004) one year after elimination.

Until recently, no column was available to remove selectively the specific type of autoantibody against the β1-adrenergic receptor that was hypothesized to influence cardiac performance negatively. Substitution of immunoglobulins, a widely used procedure after unselective immunoadsorption, can be avoided. Selective removal of autoantibodies against β1-adrenergic receptors had favorable effects on cardiac performance in patients with idiopathic dilated cardiomyopathy.

Gerd Wallukat, Ph.D.
Max Delbrück Center for Molecular Medicine, 13125 Berlin, Germany

Johannes Müller, M.D.
Roland Hetzer, M.D., Ph.D.
Deutsches Herzzentrum Berlin, 13353 Berlin, Germany

4 References
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    Iwata M, Yoshikawa T, Baba A, et al. Autoimmunity against the second extracellular loop of beta(1)-adrenergic receptors induces beta-adrenergic receptor desensitization and myocardial hypertrophy in vivo. Circ Res 2001;88:578-586
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    Magnusson Y, Wallukat G, Waagstein F, Hjalmarson A, Hoebeke J. Autoimmunity in idiopathic dilated cardiomyopathy: characterization of antibodies against the beta 1-adrenoreceptor with positive chronotropic effect. Circulation 1994;89:2760-2767
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