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Muscle-specific knockout of general control of amino acid synthesis 5 (GCN5) does not enhance basal or endurance exercise-induced mitochondrial adaptation.
Mol Metab. 2017 12; 6(12):1574-1584.MM

Abstract

OBJECTIVE

Lysine acetylation is an important post-translational modification that regulates metabolic function in skeletal muscle. The acetyltransferase, general control of amino acid synthesis 5 (GCN5), has been proposed as a regulator of mitochondrial biogenesis via its inhibitory action on peroxisome proliferator activated receptor-γ coactivator-1α (PGC-1α). However, the specific contribution of GCN5 to skeletal muscle metabolism and mitochondrial adaptations to endurance exercise in vivo remain to be defined. We aimed to determine whether loss of GCN5 in skeletal muscle enhances mitochondrial density and function, and the adaptive response to endurance exercise training.

METHODS

We used Cre-LoxP methodology to generate mice with muscle-specific knockout of GCN5 (mKO) and floxed, wildtype (WT) littermates. We measured whole-body energy expenditure, as well as markers of mitochondrial density, biogenesis, and function in skeletal muscle from sedentary mice, and mice that performed 20 days of voluntary endurance exercise training.

RESULTS

Despite successful knockdown of GCN5 activity in skeletal muscle of mKO mice, whole-body energy expenditure as well as skeletal muscle mitochondrial abundance and maximal respiratory capacity were comparable between mKO and WT mice. Further, there were no genotype differences in endurance exercise-mediated mitochondrial biogenesis or increases in PGC-1α protein content.

CONCLUSION

These results demonstrate that loss of GCN5 in vivo does not promote metabolic remodeling in mouse skeletal muscle.

Authors+Show Affiliations

School of Sport, Exercise and Rehabilitation Sciences, University of Birmingham, UK.Department of Orthopaedic Surgery, University of California, La Jolla, San Diego, CA, USA; Biomedical Sciences Graduate Program, University of California, La Jolla, San Diego, CA, USA.Department of Orthopaedic Surgery, University of California, La Jolla, San Diego, CA, USA.Department of Orthopaedic Surgery, University of California, La Jolla, San Diego, CA, USA.Department of Orthopaedic Surgery, University of California, La Jolla, San Diego, CA, USA.Department of Orthopaedic Surgery, University of California, La Jolla, San Diego, CA, USA.Department of Orthopaedic Surgery, University of California, La Jolla, San Diego, CA, USA.Program in Physical Therapy, Washington University School of Medicine, St Louis, MO, USA.School of Sport, Stirling University, Stirling, UK.Department of Orthopaedic Surgery, University of California, La Jolla, San Diego, CA, USA; Biomedical Sciences Graduate Program, University of California, La Jolla, San Diego, CA, USA. Electronic address: sschenk@ucsd.edu.School of Sport, Exercise and Rehabilitation Sciences, University of Birmingham, UK. Electronic address: a.philp@bham.ac.uk.

Pub Type(s)

Journal Article
Research Support, N.I.H., Extramural
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

29111103

Citation

Dent, Jessica R., et al. "Muscle-specific Knockout of General Control of Amino Acid Synthesis 5 (GCN5) Does Not Enhance Basal or Endurance Exercise-induced Mitochondrial Adaptation." Molecular Metabolism, vol. 6, no. 12, 2017, pp. 1574-1584.
Dent JR, Martins VF, Svensson K, et al. Muscle-specific knockout of general control of amino acid synthesis 5 (GCN5) does not enhance basal or endurance exercise-induced mitochondrial adaptation. Mol Metab. 2017;6(12):1574-1584.
Dent, J. R., Martins, V. F., Svensson, K., LaBarge, S. A., Schlenk, N. C., Esparza, M. C., Buckner, E. H., Meyer, G. A., Hamilton, D. L., Schenk, S., & Philp, A. (2017). Muscle-specific knockout of general control of amino acid synthesis 5 (GCN5) does not enhance basal or endurance exercise-induced mitochondrial adaptation. Molecular Metabolism, 6(12), 1574-1584. https://doi.org/10.1016/j.molmet.2017.10.004
Dent JR, et al. Muscle-specific Knockout of General Control of Amino Acid Synthesis 5 (GCN5) Does Not Enhance Basal or Endurance Exercise-induced Mitochondrial Adaptation. Mol Metab. 2017;6(12):1574-1584. PubMed PMID: 29111103.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Muscle-specific knockout of general control of amino acid synthesis 5 (GCN5) does not enhance basal or endurance exercise-induced mitochondrial adaptation. AU - Dent,Jessica R, AU - Martins,Vitor F, AU - Svensson,Kristoffer, AU - LaBarge,Samuel A, AU - Schlenk,Noah C, AU - Esparza,Mary C, AU - Buckner,Elisa H, AU - Meyer,Gretchen A, AU - Hamilton,D Lee, AU - Schenk,Simon, AU - Philp,Andrew, Y1 - 2017/10/16/ PY - 2017/09/12/received PY - 2017/09/29/revised PY - 2017/10/10/accepted PY - 2017/11/8/pubmed PY - 2019/1/2/medline PY - 2017/11/8/entrez KW - Acetylation KW - Deacetylase KW - GCN5 KW - Mitochondria KW - PGC-1α KW - SIRT1 SP - 1574 EP - 1584 JF - Molecular metabolism JO - Mol Metab VL - 6 IS - 12 N2 - OBJECTIVE: Lysine acetylation is an important post-translational modification that regulates metabolic function in skeletal muscle. The acetyltransferase, general control of amino acid synthesis 5 (GCN5), has been proposed as a regulator of mitochondrial biogenesis via its inhibitory action on peroxisome proliferator activated receptor-γ coactivator-1α (PGC-1α). However, the specific contribution of GCN5 to skeletal muscle metabolism and mitochondrial adaptations to endurance exercise in vivo remain to be defined. We aimed to determine whether loss of GCN5 in skeletal muscle enhances mitochondrial density and function, and the adaptive response to endurance exercise training. METHODS: We used Cre-LoxP methodology to generate mice with muscle-specific knockout of GCN5 (mKO) and floxed, wildtype (WT) littermates. We measured whole-body energy expenditure, as well as markers of mitochondrial density, biogenesis, and function in skeletal muscle from sedentary mice, and mice that performed 20 days of voluntary endurance exercise training. RESULTS: Despite successful knockdown of GCN5 activity in skeletal muscle of mKO mice, whole-body energy expenditure as well as skeletal muscle mitochondrial abundance and maximal respiratory capacity were comparable between mKO and WT mice. Further, there were no genotype differences in endurance exercise-mediated mitochondrial biogenesis or increases in PGC-1α protein content. CONCLUSION: These results demonstrate that loss of GCN5 in vivo does not promote metabolic remodeling in mouse skeletal muscle. SN - 2212-8778 UR - https://www.unboundmedicine.com/medline/citation/29111103/Muscle_specific_knockout_of_general_control_of_amino_acid_synthesis_5__GCN5__does_not_enhance_basal_or_endurance_exercise_induced_mitochondrial_adaptation_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S2212-8778(17)30696-8 DB - PRIME DP - Unbound Medicine ER -