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The effect of oxygen in Sirt3-mediated myocardial protection: A proof-of-concept study in cultured cardiomyoblasts

Citation

Diehl, P and Gaul, DS and Sogl, J and Flierl, U and Henstridge, DC and Pahla, J and Bugger, H and Emmert, MY and Ruschitzka, F and Bode, C and Luscher, TF and Moser, M and Matter, CM and Peter, K and Winnik, S, The effect of oxygen in Sirt3-mediated myocardial protection: A proof-of-concept study in cultured cardiomyoblasts, Journal of Thrombosis and Thrombolysis, 46, (1) pp. 102-112. ISSN 0929-5305 (2018) [Refereed Article]

Copyright Statement

Copyright 2018 Springer Science+Business Media, LLC, part of Springer Nature

DOI: doi:10.1007/s11239-018-1677-3

Abstract

Sirtuin 3 is a nicotinamide adenine dinucleotide dependent mitochondrial deacetylase that governs mitochondrial metabolism and oxidative defense. The demise in myocardial function following myocardial ischemia has been associated with mitochondrial dysfunction. Sirt3 maintains myocardial contractile function and protects from cardiac hypertrophy. The role of Sirt3 in ischemia is controversial. Our objective was to understand, under what circumstances Sirt3 is protective in different facets of ischemia, using an in vitro proof-of-concept approach based on simulated ischemia in cultured cardiomyoblasts. Cultured H9c2 cardiomyoblasts were subjected to hypoxia and/or serum deprivation, the combination of which we refer to as simulated ischemia. Apoptosis, as assessed by Annexin V staining in life-cell imaging and propidium-iodide inclusion in flow cytometry, was enhanced following simulated ischemia. Interestingly, serum deprivation was a stronger trigger of apoptosis than hypoxia. Knockdown of Sirt3 further increased apoptosis upon serum deprivation, whereas no such effect occurred upon additional hypoxia. Similarly, only upon serum deprivation but not upon simulated ischemia, silencing of Sirt3 led to a deterioration of mitochondrial function in extracellular flux analysis. In the absence of oxygen these Sirt3-dependent effects were abolished. These data indicate, that Sirt3-mediated myocardial protection is oxygen-dependent. Thus, mitochondrial respiration takes center-stage in Sirt3-dependent prevention of stress-induced myocardial damage.

Item Details

Item Type:Refereed Article
Keywords:cardiomyoblasts, Ischemia, mitochondrial function, oxygen, Sirt3, sirtuin 3, oxygen, protective agent, sirtuin 3, animal cell, animal tissue, apoptosis, cardiac muscle cell, cell function, cell structure, controlled study, cytolysis, embryo
Research Division:Biological Sciences
Research Group:Biochemistry and cell biology
Research Field:Cell metabolism
Objective Division:Health
Objective Group:Clinical health
Objective Field:Clinical health not elsewhere classified
UTAS Author:Henstridge, DC (Mr Darren Henstridge)
ID Code:133387
Year Published:2018
Deposited By:Health Sciences
Deposited On:2019-06-24
Last Modified:2019-08-30
Downloads:0

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