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- W1999391010 abstract "Relatively little is known concerning the regulation of uncoupling proteins (UCPs) in the heart. We investigated in the adult rodent heart 1) whether changes in workload, substrate supply, or cytokine (TNF-alpha) administration affect UCP-2 and UCP-3 expression, and 2) whether peroxisome proliferator-activated receptor alpha (PPARalpha) regulates the expression of either UCP-2 or UCP-3. Direct comparisons were made between cardiac and skeletal muscle. UCP-2, UCP-3, and PPARalpha expression were reduced when cardiac workload was either increased (pressure overload by aortic constriction) or decreased (mechanical unloading by heterotopic transplantation). Similar results were observed during cytokine administration. Reduced dietary fatty acid availability resulted in decreased expression of both cardiac UCP-2 and UCP-3. However, when fatty acid (the natural ligand for PPARalpha) supply was increased (high-fat feeding, fasting, and STZ-induced diabetes), cardiac UCP-3 but not UCP-2 expression increased. Comparable results were observed in rats treated with the specific PPARalpha agonist WY-14,643. The level of cardiac UCP-3 but not UCP-2 expression was severely reduced (20-fold) in PPARalpha-/- mice compared to wild-type mice. These results suggest that in the adult rodent heart, UCP-3 expression is regulated by PPARalpha. In contrast, cardiac UCP-2 expression is regulated in part by a fatty acid-dependent, PPARalpha-independent mechanism." @default.
- W1999391010 created "2016-06-24" @default.
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- W1999391010 date "2001-03-01" @default.
- W1999391010 modified "2023-10-09" @default.
- W1999391010 title "Uncoupling protein 3 transcription is regulated by peroxisome proliferator‐activated receptor α in the adult rodent heart" @default.
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- W1999391010 doi "https://doi.org/10.1096/fj.00-0351com" @default.
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