Abstract
Lysine-acetylation within a protein is considered as a functionally relevant post-translation modification regulating activity of the target protein. While protein acetylation is regulated by acetyl-transferases, deacetylation is catalyzed by deacetylases. Recently a family of nicotinamide-adenine-dinucleotide (NAD)-dependent deacetylases, called sirtuins, has been identified, which are emerging as key regulators of many biological functions, spanning from cell growth to longevity. Among the seven sirtuin isoforms (SIRT1–SIRT7) expressed in mammalian cells, two isoforms SIRT1 and SIRT3 have been studied with some detail for their roles in regulating cardiac adaptation to increased workload. SIRT1 was found to regulate Akt signaling and plays an essential role for the development of cardiac hypertrophy. SIRT3 on the other hand was found to act as a negative regulator of cardiac hypertrophy, which also protects cardiomyocytes from oxidative stress-mediated apoptosis. The mechanism behind anti-growth and anti-apoptotic activity of SIRT3 seems to stem from its ability to deacetylate several mitochondrial target proteins and thereby promoting overall function of mitochondria to generate less reactive oxygen species (ROS) and more ATP synthesis. As both SIRT1 and SIRT3 are activated by physical exercise and calorie restriction, some of the cardiac benefits arising from these interventions are likely to be stemming from the activation of these two molecules. This chapter gives a brief overview of sirtuin biology and then focuses on the opposite roles of SIRT1 and SIRT3 to regulate cardiac remodeling associated with hypertrophy.
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This study was supported by grants from AHA and NIH.
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Pillai, V.B., Gupta, M.P. (2013). Role of Sirtuins in Regulation of Cardiac Adaptation Associated with Hypertrophy. In: Ostadal, B., Dhalla, N. (eds) Cardiac Adaptations. Advances in Biochemistry in Health and Disease, vol 4. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-5203-4_19
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DOI: https://doi.org/10.1007/978-1-4614-5203-4_19
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