Uncoupling protein 3 deficiency impairs myocardial fatty acid oxidation and contractile recovery following ischemia/reperfusion.

Autor: Edwards KS; Department of Physiology and Biophysics, University of Mississippi Medical Center, 2500 N. State St., Jackson, MS, 39216-4505, USA.; Mississippi Center for Obesity Research, University of Mississippi Medical Center, Jackson, MS, USA.; Mississippi Center for Heart Research, University of Mississippi Medical Center, Jackson, MS, USA., Ashraf S; Department of Physiology and Biophysics, University of Mississippi Medical Center, 2500 N. State St., Jackson, MS, 39216-4505, USA.; Mississippi Center for Obesity Research, University of Mississippi Medical Center, Jackson, MS, USA.; Mississippi Center for Heart Research, University of Mississippi Medical Center, Jackson, MS, USA., Lomax TM; Department of Physiology and Biophysics, University of Mississippi Medical Center, 2500 N. State St., Jackson, MS, 39216-4505, USA.; Mississippi Center for Obesity Research, University of Mississippi Medical Center, Jackson, MS, USA.; Mississippi Center for Heart Research, University of Mississippi Medical Center, Jackson, MS, USA., Wiseman JM; Department of Physiology and Biophysics, University of Mississippi Medical Center, 2500 N. State St., Jackson, MS, 39216-4505, USA.; Mississippi Center for Obesity Research, University of Mississippi Medical Center, Jackson, MS, USA.; Mississippi Center for Heart Research, University of Mississippi Medical Center, Jackson, MS, USA., Hall ME; Department of Physiology and Biophysics, University of Mississippi Medical Center, 2500 N. State St., Jackson, MS, 39216-4505, USA.; Mississippi Center for Obesity Research, University of Mississippi Medical Center, Jackson, MS, USA.; Mississippi Center for Heart Research, University of Mississippi Medical Center, Jackson, MS, USA.; Department of Medicine, University of Mississippi Medical Center, Jackson, MS, USA., Gava FN; Department of Physiology and Biophysics, University of Mississippi Medical Center, 2500 N. State St., Jackson, MS, 39216-4505, USA.; Mississippi Center for Obesity Research, University of Mississippi Medical Center, Jackson, MS, USA., Hall JE; Department of Physiology and Biophysics, University of Mississippi Medical Center, 2500 N. State St., Jackson, MS, 39216-4505, USA.; Mississippi Center for Obesity Research, University of Mississippi Medical Center, Jackson, MS, USA., Hosler JP; Department of Cell and Molecular Biology, University of Mississippi Medical Center, Jackson, MS, USA., Harmancey R; Department of Physiology and Biophysics, University of Mississippi Medical Center, 2500 N. State St., Jackson, MS, 39216-4505, USA. rharmancey@umc.edu.; Mississippi Center for Obesity Research, University of Mississippi Medical Center, Jackson, MS, USA. rharmancey@umc.edu.; Mississippi Center for Heart Research, University of Mississippi Medical Center, Jackson, MS, USA. rharmancey@umc.edu.
Jazyk: angličtina
Zdroj: Basic research in cardiology [Basic Res Cardiol] 2018 Oct 29; Vol. 113 (6), pp. 47. Date of Electronic Publication: 2018 Oct 29.
DOI: 10.1007/s00395-018-0707-9
Abstrakt: Patients with insulin resistance and type 2 diabetes have poor cardiac outcomes following myocardial infarction (MI). The mitochondrial uncoupling protein 3 (UCP3) is down-regulated in the heart with insulin resistance. We hypothesized that decreased UCP3 levels contribute to poor cardiac recovery following ischemia/reperfusion (I/R). After confirming that myocardial UCP3 levels were systematically decreased by 20-49% in animal models of insulin resistance and type 2 diabetes, we genetically engineered Sprague-Dawley rats with partial loss of UCP3 (ucp3 +/- ). Wild-type littermates (ucp3 +/+ ) were used as controls. Isolated working hearts from ucp3 +/- rats were characterized by impaired recovery of cardiac power and decreased long-chain fatty acid (LCFA) oxidation following I/R. Mitochondria isolated from ucp3 +/- hearts subjected to I/R in vivo displayed increased reactive oxygen species (ROS) generation and decreased respiratory complex I activity. Supplying ucp3 +/- cardiac mitochondria with the medium-chain fatty acid (MCFA) octanoate slowed electron transport through the respiratory chain and reduced ROS generation. This was accompanied by improvement of cardiac LCFA oxidation and recovery of contractile function post ischemia. In conclusion, we demonstrated that normal cardiac UCP3 levels are essential to recovery of LCFA oxidation, mitochondrial respiratory capacity, and contractile function following I/R. These results reveal a potential mechanism for the poor prognosis of type 2 diabetic patients following MI and expose MCFA supplementation as a feasible metabolic intervention to improve recovery of these patients at reperfusion.
Databáze: MEDLINE
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