SIRT6 deacetylase transcriptionally regulates glucose metabolism in heart

Khan, Danish and Sarikhani, Mohsen and Dasgupta, Subhajit and Maniyadath, Babukrishna and Pandit, Anwit S and Mishra, Sneha and Ahamed, Faiz and Dubey, Abhinav and Fathma, Nowrin and Atreya, Hanudatta S and Kolthur-Seetharam, Ullas and Sundaresan, Nagalingam R (2018) SIRT6 deacetylase transcriptionally regulates glucose metabolism in heart. In: JOURNAL OF CELLULAR PHYSIOLOGY, 233 (7). pp. 5478-5489.

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Abstract

Sirtuins are a family of enzymes, which govern a number of cellular processes essential for maintaining physiological balance. SIRT6, a nuclear sirtuin, is implicated in the development of metabolic disorders. The role of SIRT6 in regulation of cardiac metabolism is unexplored. Although glucose is not the primary energy source of heart, defects in glucose oxidation have been linked to heart failure. SIRT6(+/-) mice hearts exhibit increased inhibitory phosphorylation of PDH subunit E1. SIRT6 deficiency enhances FoxO1 nuclear localization that results in increased expression of PDK4. We show that SIRT6 transcriptionally regulates the expression of PDK4 by binding to its promoter. SIRT6(+/-) hearts show accumulation of lactate, indicating compromised mitochondrial oxidation. SIRT6 deficiency results in decreased oxygen consumption rate and concomitantly lesser ATP production. Mechanistically, SIRT6 deficiency leads to increased FoxO1-mediated transcription of PDK4. Our findings establish a novel link between SIRT6 and cardiac metabolism, suggesting a protective role of SIRT6 in maintaining cardiac homeostasis.

Item Type:	Journal Article
Publication:	JOURNAL OF CELLULAR PHYSIOLOGY
Publisher:	Wiley-Liss Inc.
Additional Information:	The Copyright for this article belong to Wiley-Liss Inc.
Keywords:	cardiovascular diseases; FoxO1; PDC; PDK4; SIRT6
Department/Centre:	Division of Biological Sciences > Microbiology & Cell Biology Division of Chemical Sciences > NMR Research Centre (Formerly Sophisticated Instruments Facility)
Date Deposited:	14 Apr 2018 18:51
Last Modified:	02 Aug 2022 10:02
URI:	https://eprints.iisc.ac.in/id/eprint/59555

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