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PPAR Research
Volume 2007 (2007), Article ID 74364, 12 pages
http://dx.doi.org/10.1155/2007/74364
Review Article

PPARs in the Control of Uncoupling Proteins Gene Expression

Department of Biochemistry and Molecular Biology, University of Barcelona, Barcelona 585 08007, Spain

Received 31 July 2006; Revised 18 October 2006; Accepted 18 October 2006

Academic Editor: Sander Kersten

Copyright © 2007 Francesc Villarroya et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Uncoupling proteins (UCPs) are mitochondrial membrane transporters involved in the control of energy conversion in mitochondria. Experimental and genetic evidence relate dysfunctions of UCPs with metabolic syndrome and obesity. The PPAR subtypes mediate to a large extent the transcriptional regulation of the UCP genes, with a distinct relevance depending on the UCP gene and the tissue in which it is expressed. UCP1 gene is under the dual control of PPARγ and PPARα in relation to brown adipocyte differentiation and lipid oxidation, respectively. UCP3 gene is regulated by PPARα and PPARδ in the muscle, heart, and adipose tissues. UCP2 gene is also under the control of PPARs even in tissues in which it is the predominantly expressed UCP (eg, the pancreas and liver). This review summarizes the current understanding of the role of PPARs in UCPs gene expression in normal conditions and also in the context of type-2 diabetes or obesity.