SIRT6 deacetylase transcriptionally regulates glucose metabolism in heart.

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 E1α. 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.

journal_name

J Cell Physiol

authors

Khan D,Sarikhani M,Dasgupta S,Maniyadath B,Pandit AS,Mishra S,Ahamed F,Dubey A,Fathma N,Atreya HS,Kolthur-Seetharam U,Sundaresan NR

doi

10.1002/jcp.26434

subject

Has Abstract

pub_date

2018-07-01 00:00:00

pages

5478-5489

issue

7

eissn

0021-9541

issn

1097-4652

journal_volume

233

pub_type

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