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Thin Filament Remodeling in Failing Myocardium

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Abstract

While the remodeling process in myocardial failure involves changes in ventricular structure and performance, it is now appreciated that it is also associated with changes in thin filament composition and function. As is discussed, changes at the level thick filament may affect thin filament activation in heart failure. Alterations in actin, troponin and tropomyosin isoform composition do not appear to be significant factors in human heart failure. In contrast, proteolytic degradation of troponin subunits are likely to be playing a functional role in some forms of cardiomyopathy (e.g. ischemic). Finally, phosphorylation of troponin I and troponin T by kinases (most notably protein kinase C) substantially affect thin filament function in failing human myocardium. These findings indicate that functional deficits in thin filament function in failing myocardium are largely reversible and create the potential for future targeted therapies in the treatment of this deadly disease.

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Authors and Affiliations

  1. Departments of Medicine and Molecular Physiology & Biophysics,College of Medicine, University of Vermont, USA

    Peter VanBuren MD & Yoko Okada MD

  2. College of Medicine, University of Vermont, 126C HSRF, 149 Beaumont Ave, Burlington, 05405, VT, USA

    Peter VanBuren MD

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  1. Peter VanBuren MD
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  2. Yoko Okada MD
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Correspondence to Peter VanBuren MD.

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VanBuren, P., Okada, Y. Thin Filament Remodeling in Failing Myocardium. Heart Fail Rev 10, 199–209 (2005). https://doi.org/10.1007/s10741-005-5250-8

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