Abstract
Fatty acid oxidation (FAO) is a primary energy source for meeting the heart's energy requirements1,2,3. Peroxisome proliferator-activated receptor-δ (PPAR-δ) may have important roles in FAO4,5,6,7,8. But it remains unclear whether PPAR-δ is required for maintaining basal myocardial FAO. We show that cre-loxP-mediated cardiomyocyte-restricted deletion of PPAR-δ in mice downregulates constitutive expression of key FAO genes and decreases basal myocardial FAO. These mice have cardiac dysfunction, progressive myocardial lipid accumulation, cardiac hypertrophy and congestive heart failure with reduced survival. Thus, chronic myocardial PPAR-δ deficiency leads to lipotoxic cardiomyopathy. Together, our data show that PPAR-δ is a crucial determinant of constitutive myocardial FAO and is necessary to maintain energy balance and normal cardiac function. We suggest that PPAR-δ is a potential therapeutic target in treating lipotoxic cardiomyopathy and other heart diseases.
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Acknowledgements
We thank J. Chatham and G.H. Gibbons for reading of the manuscript. This work was partially supported by a starting grant from Morehouse Cardiovascular Research Institute (Enhancement of Cardiovascular and Related Research Areas, NIH/NHLBI 5 UH1 HL03676-02), grants from the US National Institutes of Health (MBRS S06GM08248 and G12-RR03034) and a scientist development award from the American Heart Association national center.
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Supplementary information
Supplementary Fig. 1
Generation of CR-PPAR-δ−/− mice. (PDF 76 kb)
Supplementary Fig. 2
Transcript levels of PPAR-α and PPAR-γ. (PDF 120 kb)
Supplementary Fig. 3
Relative protein levels of PGC-1α. (PDF 92 kb)
Supplementary Fig. 4
Heart weight to tibia length ratios. (PDF 78 kb)
Supplementary Fig. 5
Transcript levels of FAO genes. (PDF 120 kb)
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Cheng, L., Ding, G., Qin, Q. et al. Cardiomyocyte-restricted peroxisome proliferator-activated receptor-δ deletion perturbs myocardial fatty acid oxidation and leads to cardiomyopathy. Nat Med 10, 1245–1250 (2004). https://doi.org/10.1038/nm1116
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DOI: https://doi.org/10.1038/nm1116
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