© 2000 by European Society of Cardiology
Copyright © 2000, European Society of Cardiology
The role of the cytoskeleton in heart failure
aKerckhoff Clinic, Department of Thoracic Surgery, Bad Nauheim, Germany
bDepartment of Experimental Cardiology, Max-Planck-Institute, Bad Nauheim, Germany
* Corresponding author jschaper{at}kerckhoff.mpg.de
The cytoskeleton of cardiac myocytes consists of actin, the intermediate filament desmin and of
- and β-tubulin that form the microtubules by polymerization. Vinculin, talin, dystrophin and spectrin represent a separate group of membrane-associated proteins. In numerous experimental studies, the role of cytoskeletal alterations especially of microtubules and desmin, in cardiac hypertrophy and failure (CHF) has been described. Microtubules were found to be accumulated thereby posing an increased load on myocytes which impedes sarcomere motion and promotes cardiac dysfunction. Other groups were unable to confirm microtubular densification. The possibility exists that these changes are species, load and chamber dependent. Recently, damage of the dystrophin molecule and MLP (muscle LIM protein) were identified as possible causes of CHF. Our own studies in human hearts with chronic CHF due to dilated cardiomyopathy (DCM) showed that a morphological basis of reduced contractile function exists: the cytoskeletal and membrane-associated proteins are disorganized and increased in amount confirming experimental reports. In contrast, the contractile myofilaments and the proteins of the sarcomeric skeleton including titin,
-actinin, and myomesin are significantly decreased. These changes can be assumed to occur in stages and are here presented as a testable hypothesis: (1) The early and reversible stage as present in animal experiments is characterized by accumulation of cytoskeletal proteins to counteract an increased strain without loss of contractile material. (2) Further accumulation of microtubules and desmin to compensate for the increasing loss of myofilaments and titin represents the late clinical and irreversible state. We suggest, based on a structural basis for heart failure, an integrative view which closes the gap between changes within cardiac myocytes and the involvement of the extracellular matrix, including the development of fibrosis. These factors contribute significantly to structural ventricular remodeling and dilatation finally resulting in reduced cardiac function.
KEYWORDS Cardiomyopathy; Heart failure; Contractile function; Remodeling; Ventricular function
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