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Regulatory Roles of the Ubiquitin-Proteasome System in Cardiomyocyte Apoptosis

[ Vol. 10 , Issue. 1 ]

Author(s):

W. Sohns, T. A.B. van Veen and M. A.G. van der Heyden   Pages 1 - 13 ( 13 )

Abstract:


Cardiovascular disease is the leading cause of death in the western world. The major contributor of all cardiovascular deaths is myocardial infarction, which often progresses into end-stage heart failure. The loss of cardiomyocytes is a key problem in the development of cardiovascular disease. Two main processes mediate cardiomyocyte loss: necrosis and apoptosis. In contrast to necrosis, apoptosis is a well regulated process essential in normal development and tissue homeostasis. Tight regulation of this process is crucial, especially in post mitotic cells lacking regenerative capacity, like cardiomyocytes. The ubiquitin-proteasome system, accounting for 80 to 90% of intracellular protein degradation, appears to be involved in the regulation of apoptosis. In this process, regulation is performed through the degradation of pro- and anti-apoptotic proteins involved in cell cycle control and specific apoptotic pathways. On the one hand, disturbances in this normally well regulated process are associated with a number of cardiovascular diseases. On the other hand, proteasomal dysfunction may result from ischemia, hypertrophy and heart failure, and a number of cardiomyopathies. This paper reviews the current knowledge on the role of the ubiquitin-proteasome systemmediated regulation of cardiomyocyte apoptosis in cardiovascular disease. Finally, within the ubiquitinproteasome system new molecular targets for treatment of cardiovascular disease are suggested.

Keywords:

Heart, apoptosis, ubiquitination, ubiquitin-proteasome system, cardiovascular disease, p53

Affiliation:

Department of Medical Physiology, Division Heart&Lungs, University Medical Center Utrecht, Yalelaan 50, 3584 CM, Utrecht, The Netherlands.



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