Alterations in cardiac adrenergic signaling and calcium cycling differentially affect the progression of cardiomyopathy

K. Freeman, I. Lerman, E. G. Kranias, T. Bohlmeyer, M. R. Bristow, R. J. Lefkowitz, G. Iaccarino, W. J. Koch, L. A. Leinwand

Research output: Contribution to journalArticle

Abstract

The medical treatment of chronic heart failure has undergone a dramatic transition in the past decade. Short-term approaches for altering hemodynamics have given way to long-term, reparative strategies, including β-adrenergic receptor (βAR) blockade. This was once viewed as counterintuitive, because acute administration causes myocardial depression. Cardiac myocytes from failing hearts show changes in βAR signaling and excitation-contraction coupling that can impair cardiac contractility, but the role of these abnormalities in the progression of heart failure is controversial. We therefore tested the impact of different manipulations that increase contractility on the progression of cardiac dysfunction in a mouse model of hypertrophic cardiomyopathy. High-level overexpression of the β2AR caused rapidly progressive cardiac failure in this model. In contrast, phospholamban ablation prevented systolic dysfunction and exercise intolerance, but not hypertrophy, in hypertrophic cardiomyopathy mice. Cardiac expression ora peptide inhibitor of the βAR kinase 1 not only prevented systolic dysfunction and exercise intolerance but also decreased cardiac remodeling and hypertrophic gene expression. These three manipulations of cardiac contractility had distinct effects on disease progression, suggesting that selective modulation of particular aspects of βAR signaling or excitation-contraction coupling can provide therapeutic benefit.

Original languageEnglish
Pages (from-to)967-974
Number of pages8
JournalJournal of Clinical Investigation
Volume107
Issue number8
Publication statusPublished - 2001

ASJC Scopus subject areas

  • Medicine(all)

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    Freeman, K., Lerman, I., Kranias, E. G., Bohlmeyer, T., Bristow, M. R., Lefkowitz, R. J., Iaccarino, G., Koch, W. J., & Leinwand, L. A. (2001). Alterations in cardiac adrenergic signaling and calcium cycling differentially affect the progression of cardiomyopathy. Journal of Clinical Investigation, 107(8), 967-974.