Abstract #4919
Effect of Knockout of Two Acetyl-CoA Carboxylase Isoforms in the Isolated Mouse Heart on Oxidation of Exogenous and Endogenous Energy Sources
Gaurav Sharma1, Chai-Wan Kim2,3, Xiaodong Wen1, A. Dean Sherry1,4,5, Chalermchai Khemtong1,6,7, Craig R. Malloy1,2,4, and Jay D. Horton2,3
1Advanced Imaging Research Center, University of Texas Southwestern Medical Center, Dallas, TX, United States, 2Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX, United States, 3Department of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas, TX, United States, 4Department of Radiology, University of Texas Southwestern Medical Center, Dallas, TX, United States, 5Department of Chemistry, University of Texas at Dallas, Richardson, TX, United States, 6Department of Medicine, Division of Endocrinology, Diabetes and Metabolism, University of Florida, Gainesville, FL, United States, 7Department of Biochemistry and Molecular Biology, University of Florida, Gainesville, FL, United States
Synopsis
The product of acetyl-CoA carboxylase (ACC), malonyl-CoA, inhibits oxidation of long chain fatty acids by mitochondria. Cardiac-specific deletion of ACC-2 is associated with increased oxidation of fatty acids, as expected, the effects on glucose oxidation are controversial, and increased oxidation of stored triglycerides has been postulated. Expression of the other isoform, ACC-1, is preserved in ACC-2 mutant hearts, so alternative sources of malonyl-CoA may be important. We found that knock out of both isoforms was associated with a small increase in fatty acid oxidation, a small decrease in glucose oxidation, and little effect on oxidation of stored energy supplies.
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