New insights into the role of PPARs.
Montagner A, Rando G, Degueurce G, Leuenberger N, Michalik L, Wahli W.
Prostaglandins Leukot Essent Fatty Acids. 2011 Jul 19. [Epub ahead of print]
Center for Integrative Genomics, National Research Center “Frontiers in Genetics”, University of Lausanne, Genopode Building, CH-1015 Lausanne, Switzerland.
Peroxisome proliferator-activated receptors (PPARs) are fatty acid-activated transcription factors belonging to the nuclear hormone receptor family. While PPARs are best known as regulators of energy homeostasis, evidence also has accumulated recently for their involvement in basic cellular functions. We review novel insights into PPAR functions in skin wound healing and liver, with emphasis on PPARβ/δ and PPARα, respectively. Activation of PPARβ/δ expression in response to injury promotes keratinocyte survival, directional sensing, and migration over the wound bed. In addition, interleukin (IL)-1 produced by the keratinocytes activates PPARβ/δ expression in the underlying fibroblasts, which hinders the mitotic activity of keratinocytes via inhibition of IL-1 signaling. Initially, roles were identified for PPARα in fatty acid catabolism. However, PPARα is also involved in downregulating many genes in female mammals. We have elucidated the mechanism of this repression, which requires sumoylation of PPARα. Physiologically, this control confers protection against estrogen-induced intrahepatic cholestasis.
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