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Stewart JE, Crawford JM, Mullen WE, Jacques A, Stoner MW, Scott I, Thapa D. Cardiomyocyte-specific deletion of GCN5L1 reduces lysine acetylation and attenuates diastolic dysfunction in aged mice by improving cardiac fatty acid oxidation. Biochem J 2024; 481:423-436. [PMID: 38390938 DOI: 10.1042/bcj20230421] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Revised: 02/21/2024] [Accepted: 02/22/2024] [Indexed: 02/24/2024]
Abstract
Cardiac mitochondrial dysfunction is a critical contributor to the pathogenesis of aging and many age-related conditions. As such, complete control of mitochondrial function is critical to maintain cardiac efficiency in the aged heart. Lysine acetylation is a reversible post-translational modification shown to regulate several mitochondrial metabolic and biochemical processes. In the present study, we investigated how mitochondrial lysine acetylation regulates fatty acid oxidation (FAO) and cardiac function in the aged heart. We found a significant increase in mitochondrial protein acetylation in the aged heart which correlated with increased level of mitochondrial acetyltransferase-related protein GCN5L1. We showed that acetylation status of several fatty acid and glucose oxidation enzymes (long-chain acyl-coenzyme A dehydrogenase, hydroxyacyl-coA dehydrogenase, and pyruvate dehydrogenase) were significantly up-regulated in aged heart which correlated with decreased enzymatic activities. Using a cardiac-specific GCN5L1 knockout (KO) animal model, we showed that overall acetylation of mitochondrial proteins was decreased in aged KO animals, including FAO proteins which led to improved FAO activity and attenuated cardiac diastolic dysfunction observed in the aged heart. Together, these findings indicate that lysine acetylation regulates FAO in the aged heart which results in improved cardiac diastolic function and this is in part regulated by GCN5L1.
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Affiliation(s)
- Jackson E Stewart
- Division of Pathophysiology, Rehabilitation, and Performance, West Virginia University, 1 Medical Center Drive, P.O. Box 9227, Morgantown, WV 26506, U.S.A
- Mitochondria, Metabolism and Bioenergetics Working Group, West Virginia University School of Medicine, Morgantown, WV, U.S.A
| | - Jenna M Crawford
- Division of Pathophysiology, Rehabilitation, and Performance, West Virginia University, 1 Medical Center Drive, P.O. Box 9227, Morgantown, WV 26506, U.S.A
- Mitochondria, Metabolism and Bioenergetics Working Group, West Virginia University School of Medicine, Morgantown, WV, U.S.A
| | - William E Mullen
- Division of Pathophysiology, Rehabilitation, and Performance, West Virginia University, 1 Medical Center Drive, P.O. Box 9227, Morgantown, WV 26506, U.S.A
- Mitochondria, Metabolism and Bioenergetics Working Group, West Virginia University School of Medicine, Morgantown, WV, U.S.A
| | - Angelica Jacques
- Division of Pathophysiology, Rehabilitation, and Performance, West Virginia University, 1 Medical Center Drive, P.O. Box 9227, Morgantown, WV 26506, U.S.A
- Mitochondria, Metabolism and Bioenergetics Working Group, West Virginia University School of Medicine, Morgantown, WV, U.S.A
| | - Michael W Stoner
- Division of Cardiology, University of Pittsburgh, Pittsburgh, PA, U.S.A
- Vascular Medicine Institute, University of Pittsburgh, Pittsburgh, PA, U.S.A
| | - Iain Scott
- Division of Cardiology, University of Pittsburgh, Pittsburgh, PA, U.S.A
- Vascular Medicine Institute, University of Pittsburgh, Pittsburgh, PA, U.S.A
| | - Dharendra Thapa
- Division of Pathophysiology, Rehabilitation, and Performance, West Virginia University, 1 Medical Center Drive, P.O. Box 9227, Morgantown, WV 26506, U.S.A
- Mitochondria, Metabolism and Bioenergetics Working Group, West Virginia University School of Medicine, Morgantown, WV, U.S.A
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