Abstract
Sirtuin 3 (SIRT3) is a mitochondrial NAD+-dependent deacetylase that regulates energy metabolic enzymes by reversible protein lysine acetylation in various extracardiac tissues. The role of SIRT3 in myocardial energetics and in the development of mitochondrial dysfunction in cardiac pathologies, such as the failing heart, remains to be elucidated. To investigate the role of SIRT3 in the regulation of myocardial energetics and function SIRT3−/− mice developed progressive age-related deterioration of cardiac function, as evidenced by a decrease in ejection fraction and an increase in enddiastolic volume at 24 but not 8 weeks of age using echocardiography. Four weeks following transverse aortic constriction, ejection fraction was further decreased in SIRT3−/− mice compared to WT mice, accompanied by a greater degree of cardiac hypertrophy and fibrosis. In isolated working hearts, a decrease in cardiac function in SIRT3−/− mice was accompanied by a decrease in palmitate oxidation, glucose oxidation, and oxygen consumption, whereas rates of glycolysis were increased. Respiratory capacity and ATP synthesis were decreased in cardiac mitochondria of SIRT3−/− mice. HPLC measurements revealed a decrease of the myocardial ATP/AMP ratio and of myocardial energy charge. Using LC–MS/MS, we identified increased acetylation of 84 mitochondrial proteins, including 6 enzymes of fatty acid import and oxidation, 50 subunits of the electron transport chain, and 3 enzymes of the tricarboxylic acid cycle. Lack of SIRT3 impairs mitochondrial and contractile function in the heart, likely due to increased acetylation of various energy metabolic proteins and subsequent myocardial energy depletion.
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Abbreviations
- 4-HNE:
-
4-hydroxynonenal
- ACN:
-
Acetonitrile
- ANT1:
-
Adenine nucleotide translocator 1
- ATPase6:
-
ATP synthase F0 subunit 6
- Cox II:
-
Cytochrome c oxidase subunit 2
- Cox IV:
-
Cytochrome c oxidase subunit 4
- Cpt:
-
Carnitine palmitoyltransferase
- Errα:
-
Estrogen-related receptor alpha
- FOXO3a:
-
Forkhead box O3a
- GDH:
-
Glutamate dehydrogenase
- Hadhβ:
-
Hydroxyacyl CoA dehydrogenase beta
- KHB:
-
Krebs Henseleit buffer
- Lcad:
-
Long-chain acyl-CoA dehydrogenase
- Mcad:
-
Medium-chain acyl-CoA dehydrogenase
- mt-Nd2:
-
NADH dehydrogenase 2, mitochondrial
- MVO2 :
-
Myocardial oxygen consumption
- Ndufv1:
-
NADH dehydrogenase [ubiquinone] flavoprotein 1
- Ndufa9:
-
NADH dehydrogenase [ubiquinone] 1 alpha subcomplex subunit 9
- Pparα:
-
Peroxisome proliferator-activated receptor alpha
- Uqcrc1:
-
Ubiquinol cytochrome c reductase core protein 1
- Nrf1:
-
Nuclear respiratory factor 1
- Pgc-1α:
-
Peroxisome proliferator-activated receptor gamma coactivator 1 alpha
- Pgc-1β:
-
Peroxisome proliferator-activated receptor gamma coactivator 1 beta
- Sod2:
-
Manganese superoxide dismutase
- Sdh1:
-
Succinate dehydrogenase flavoprotein subunit 1
- TAC:
-
Transverse aortic constriction
- Tfam:
-
Mitochondrial transcription factor A
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Acknowledgments
We like to thank the laboratory of E. Dale Abel for expert technical assistance in establishing the isolated working heart perfusion. This study was supported by a research grant of the Deutsche Forschungsgemeinschaft to H. B. (Bu2126/2-1).
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Koentges, C., Pfeil, K., Schnick, T. et al. SIRT3 deficiency impairs mitochondrial and contractile function in the heart. Basic Res Cardiol 110, 36 (2015). https://doi.org/10.1007/s00395-015-0493-6
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DOI: https://doi.org/10.1007/s00395-015-0493-6