Abstract
Protein homeostasis is a critical cellular process to maintain protein function. Because the genome encodes for a very large number of discrete proteins and only a fraction of this number are needed or utilized for cellular function at a given time, a closely regulated system is necessary to control the synthesis, transport, and degradation of these molecules. The turnover of proteins can vary and cells tend to accumulate a large amount of expended, sometimes aberrantly folded and oxidized proteins that must be eliminated, degraded, and/or recycled. The majority of eukaryotic protein degradation is executed by the ubiquitin proteasome system (UPS). This system has acquired a central position in our understanding of cellular protein homeostasis. The UPS is one of the many posttranslational modifications of proteins that include acylation, alkylation, glycosylation, hydroxylation, and nitrosylation. These posttranslational modifications, while essential for protein homeostasis, if perturbed sufficiently, can also lead to pathological change. Abnormalities of the UPS have been implicated in the pathogenesis of a variety of diseases including cardiovascular disease. Accumulating evidence in recent years has strongly implicated the UPS in cardiovascular physiology and pathology. This chapter will review the role of the UPS in cardiovascular pathophysiology. We will describe the basic mechanistic underpinnings of the UPS and delineate its role in vascular physiology. The potential waypoints in the UPS signaling system where pathological events are known or thought to occur will be defined. Finally, an overview of how the UPS can be pharmacologically manipulated and whether this strategy has therapeutic currency will be presented.
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Acknowledgments
Dr. Ming-Hui Zou’s laboratory is supported by NIH grants (HL079584, HL080499, HL074399, HL089920, HL096032, and HL105157), a grant-in-aid from the Juvenile Diabetes Research foundation, a Research Award from the Oklahoma Center for the Advancement of Science and Technology (OCAST), a Research Award from the American Diabetes Association, and funds from the Warren Chair of the University of Oklahoma Health Science Center. Dr. Zou is a recipient of the National Established Investigator award of American Heart Association.
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Shirwany, N.A., Zou, MH. (2012). The Ubiquitin Proteasome System in Endothelial Cell Dysfunction and Vascular Disease. In: Homeister, J., Willis, M. (eds) Molecular and Translational Vascular Medicine. Molecular and Translational Medicine. Humana Press, Totowa, NJ. https://doi.org/10.1007/978-1-61779-906-8_4
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