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Extreme Acetylation of the Cardiac Mitochondrial Proteome Does Not Promote Heart Failure.

Publication ,  Journal Article
Davidson, MT; Grimsrud, PA; Lai, L; Draper, JA; Fisher-Wellman, KH; Narowski, TM; Abraham, DM; Koves, TR; Kelly, DP; Muoio, DM
Published in: Circ Res
September 25, 2020

RATIONALE: Circumstantial evidence links the development of heart failure to posttranslational modifications of mitochondrial proteins, including lysine acetylation (Kac). Nonetheless, direct evidence that Kac compromises mitochondrial performance remains sparse. OBJECTIVE: This study sought to explore the premise that mitochondrial Kac contributes to heart failure by disrupting oxidative metabolism. METHODS AND RESULTS: A DKO (dual knockout) mouse line with deficiencies in CrAT (carnitine acetyltransferase) and Sirt3 (sirtuin 3)-enzymes that oppose Kac by buffering the acetyl group pool and catalyzing lysine deacetylation, respectively-was developed to model extreme mitochondrial Kac in cardiac muscle, as confirmed by quantitative acetyl-proteomics. The resulting impact on mitochondrial bioenergetics was evaluated using a respiratory diagnostics platform that permits comprehensive assessment of mitochondrial function and energy transduction. Susceptibility of DKO mice to heart failure was investigated using transaortic constriction as a model of cardiac pressure overload. The mitochondrial acetyl-lysine landscape of DKO hearts was elevated well beyond that observed in response to pressure overload or Sirt3 deficiency alone. Relative changes in the abundance of specific acetylated lysine peptides measured in DKO versus Sirt3 KO hearts were strongly correlated. A proteomics comparison across multiple settings of hyperacetylation revealed ≈86% overlap between the populations of Kac peptides affected by the DKO manipulation as compared with experimental heart failure. Despite the severity of cardiac Kac in DKO mice relative to other conditions, deep phenotyping of mitochondrial function revealed a surprisingly normal bioenergetics profile. Thus, of the >120 mitochondrial energy fluxes evaluated, including substrate-specific dehydrogenase activities, respiratory responses, redox charge, mitochondrial membrane potential, and electron leak, we found minimal evidence of oxidative insufficiencies. Similarly, DKO hearts were not more vulnerable to dysfunction caused by transaortic constriction-induced pressure overload. CONCLUSIONS: The findings challenge the premise that hyperacetylation per se threatens metabolic resilience in the myocardium by causing broad-ranging disruption to mitochondrial oxidative machinery.

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Published In

Circ Res

DOI

EISSN

1524-4571

Publication Date

September 25, 2020

Volume

127

Issue

8

Start / End Page

1094 / 1108

Location

United States

Related Subject Headings

  • Sirtuin 3
  • Proteomics
  • Proteome
  • Protein Processing, Post-Translational
  • Oxidative Stress
  • Myocytes, Cardiac
  • Mitochondrial Proteins
  • Mitochondria, Heart
  • Mice, Knockout
  • Mice, Inbred C57BL
 

Citation

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Davidson, M. T., Grimsrud, P. A., Lai, L., Draper, J. A., Fisher-Wellman, K. H., Narowski, T. M., … Muoio, D. M. (2020). Extreme Acetylation of the Cardiac Mitochondrial Proteome Does Not Promote Heart Failure. Circ Res, 127(8), 1094–1108. https://doi.org/10.1161/CIRCRESAHA.120.317293
Davidson, Michael T., Paul A. Grimsrud, Ling Lai, James A. Draper, Kelsey H. Fisher-Wellman, Tara M. Narowski, Dennis M. Abraham, Timothy R. Koves, Daniel P. Kelly, and Deborah M. Muoio. “Extreme Acetylation of the Cardiac Mitochondrial Proteome Does Not Promote Heart Failure.Circ Res 127, no. 8 (September 25, 2020): 1094–1108. https://doi.org/10.1161/CIRCRESAHA.120.317293.
Davidson MT, Grimsrud PA, Lai L, Draper JA, Fisher-Wellman KH, Narowski TM, et al. Extreme Acetylation of the Cardiac Mitochondrial Proteome Does Not Promote Heart Failure. Circ Res. 2020 Sep 25;127(8):1094–108.
Davidson, Michael T., et al. “Extreme Acetylation of the Cardiac Mitochondrial Proteome Does Not Promote Heart Failure.Circ Res, vol. 127, no. 8, Sept. 2020, pp. 1094–108. Pubmed, doi:10.1161/CIRCRESAHA.120.317293.
Davidson MT, Grimsrud PA, Lai L, Draper JA, Fisher-Wellman KH, Narowski TM, Abraham DM, Koves TR, Kelly DP, Muoio DM. Extreme Acetylation of the Cardiac Mitochondrial Proteome Does Not Promote Heart Failure. Circ Res. 2020 Sep 25;127(8):1094–1108.

Published In

Circ Res

DOI

EISSN

1524-4571

Publication Date

September 25, 2020

Volume

127

Issue

8

Start / End Page

1094 / 1108

Location

United States

Related Subject Headings

  • Sirtuin 3
  • Proteomics
  • Proteome
  • Protein Processing, Post-Translational
  • Oxidative Stress
  • Myocytes, Cardiac
  • Mitochondrial Proteins
  • Mitochondria, Heart
  • Mice, Knockout
  • Mice, Inbred C57BL