The long term objectives of this research are: 1) elucidate intracellular mechanisms linking cardiac dysfunction to protein-mediated, cellular uptake, accumulation and turnover of lipid, in the form of triacylglyceride (TAG), and the altered fatty acid oxidation in diabetic cardiomyopathy;2)advance nondestructive, metabolic profiling of the heart using novel applications of carbon-13 (13C) NMR, to monitor distinct contributions of lipid transport processesinto the cardiac muscle cell during the altered TAG turnover that occurs in diseased and stressed hearts. Based on data acquired during the currently funded period, new experiments will test a 3-fold hypothesis: 1)The balance between long chain fatty acid uptakeand oxidation that determines TAG turnover is heavily influenced by the activity of fatty acid transport proteins on the cell membrane and that disruption of this balance in the diabetic heart contributes to the development of cardiac dysfunction;2) dynamic NMR of 13C enrichment rates of TAG in the intact, beating heart provide precise kinetic information on the activity of fatty acid transporters on the cell membrane that determine the extent of lipid deposition in both normal and diseased hearts;and 3) intramyocardial lipid content affects regional strain in the left venctricle (LV) wall by either intracellular mechanisms leading to contractile dysfunction and/or mechanical influences on LV wall dynamics. The hypotheses will betested on rats and mice using a unique multidisciplinary approach that combines 13C NMR of metabolic flux and lipid uptake dynamics in intact hearts with genetic manipulation of fatty acid uptake and oxidation for comparisonto diabetic animals, as well as in vivo cardiac tagged MRI of wall strain with in vivo chemical shift imaging and localized NMR spectroscopy of TAG content in hearts of transgenic mouse models mimicing the diabetic phenotype for TAG accumulation.
Specific aims are: 1) Define changes in fatty acid uptake and TAG turnover due to different affinities of long chain fatty acids (palmitate vs. oleate) for incorporation into the TAG pool;2) use 13CNMR of intact hearts to nondestructive^ detect perturbations of fatty acid transport/uptake into cardiomyocytesof transgenic mouse hearts and rat hearts receiving metabolic gene transfer;3) measureregional 2D strain and intra/extracellular TAG content in the LVwall of mice with altered lipid metabolism.Anticipated results will provide a mechanistic link between cardiac lipid accumulation and contractile dysfunction in diseased hearts.

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Method to Extend Research in Time (MERIT) Award (R37)
Project #
5R37HL049244-19
Application #
8321516
Study Section
Special Emphasis Panel (NSS)
Program Officer
Adhikari, Bishow B
Project Start
1993-08-01
Project End
2014-07-31
Budget Start
2012-08-01
Budget End
2014-07-31
Support Year
19
Fiscal Year
2012
Total Cost
$617,800
Indirect Cost
$224,297
Name
University of Illinois at Chicago
Department
Physiology
Type
Schools of Medicine
DUNS #
098987217
City
Chicago
State
IL
Country
United States
Zip Code
60612
Banke, Natasha H; Lewandowski, E Douglas (2015) Impaired cytosolic NADH shuttling and elevated UCP3 contribute to inefficient citric acid cycle flux support of postischemic cardiac work in diabetic hearts. J Mol Cell Cardiol 79:13-20
O'Donnell, J Michael; Fasano, Matthew J; Lewandowski, E Douglas (2015) Resolving confounding enrichment kinetics due to overlapping resonance signals from 13C-enriched long chain fatty acid oxidation and uptake within intact hearts. Magn Reson Med 74:330-5
Lahey, Ryan; Wang, Xuerong; Carley, Andrew N et al. (2014) Dietary fat supply to failing hearts determines dynamic lipid signaling for nuclear receptor activation and oxidation of stored triglyceride. Circulation 130:1790-9
Lewandowski, E Douglas; Fischer, Susan K; Fasano, Matthew et al. (2013) Acute liver carnitine palmitoyltransferase I overexpression recapitulates reduced palmitate oxidation of cardiac hypertrophy. Circ Res 112:57-65
Carley, Andrew N; Bi, Jian; Wang, Xuerong et al. (2013) Multiphasic triacylglycerol dynamics in the intact heart during acute in vivo overexpression of CD36. J Lipid Res 54:97-106
Banke, Natasha H; Yan, Lin; Pound, Kayla M et al. (2012) Sexual dimorphism in cardiac triacylglyceride dynamics in mice on long term caloric restriction. J Mol Cell Cardiol 52:733-40
Kudej, Raymond K; Fasano, Mathew; Zhao, Xin et al. (2011) Second window of preconditioning normalizes palmitate use for oxidation and improves function during low-flow ischaemia. Cardiovasc Res 92:394-400
Banke, Natasha H; Wende, Adam R; Leone, Teresa C et al. (2010) Preferential oxidation of triacylglyceride-derived fatty acids in heart is augmented by the nuclear receptor PPARalpha. Circ Res 107:233-41
Gropler, Robert J; Beanlands, Rob S B; Dilsizian, Vasken et al. (2010) Imaging myocardial metabolic remodeling. J Nucl Med 51 Suppl 1:88S-101S
Hankiewicz, Janusz H; Banke, Natasha H; Farjah, Mariam et al. (2010) Early impairment of transmural principal strains in the left ventricular wall after short-term, high-fat feeding of mice predisposed to cardiac steatosis. Circ Cardiovasc Imaging 3:710-7

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