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Journal of Lipid Research, Vol. 41, 1801-1807, November 2000
Copyright © 2000 by Lipid Research, Inc.
Pristanic acid and phytanic acid: naturally occurring ligands for the nuclear receptor peroxisome proliferator-activated receptor
Anna W. M. Zomera,b,
Bart van der Burga,
Gerbert A. Jansenc,
Ronald J. A. Wandersc,d,
Bwee Tien Poll-Theb, and
Paul T. van der Saaga
a Hubrecht Laboratory, Netherlands Institute for Developmental Biology, 3584 CT Utrecht, The Netherlands
b Department of Pediatrics/Metabolic Diseases, University Medical Center Utrecht, 3584 EA Utrecht, The Netherlands
c Departments of Pediatrics, Laboratory for Genetic Metabolic Diseases, Academic Medical Center, University of Amsterdam, 1100 DE Amsterdam, The Netherlands
d (Emma Children's Hospital) and Clinical Chemistry, Laboratory for Genetic Metabolic Diseases, Academic Medical Center, University of Amsterdam, 1100 DE Amsterdam, The Netherlands
Correspondence to:
Anna W. M. Zomer
Phytanic acid and pristanic acid are branched-chain fatty acids, present at micromolar concentrations in the plasma of healthy individuals. Here we show that both phytanic acid and pristanic acid activate the peroxisome proliferator-activated receptor (PPAR ) in a concentration-dependent manner. Activation is observed via the ligand-binding domain of PPAR as well as via a PPAR response element (PPRE). Via the PPRE significant induction is found with both phytanic acid and pristanic acid at concentrations of 3 and 1 µM, respectively. The trans-activation of PPAR and PPAR by these two ligands is negligible. Besides PPAR , phytanic acid also trans-activates all three retinoic X receptor subtypes in a concentration-dependent manner. In primary human fibroblasts, deficient in phytanic acid -oxidation, trans-activation through PPAR by phytanic acid is observed. This clearly demonstrates that phytanic acid itself, and not only its metabolite, pristanic acid, is a true physiological ligand for PPAR . Because induction of PPAR occurs at ligand concentrations comparable to the levels found for phytanic acid and pristanic acid in human plasma, these fatty acids should be seen as naturally occurring ligands for PPAR .
These results demonstrate that both pristanic acid and phytanic acid are naturally occurring ligands for PPAR , which are present at physiological concentrations. Zomer, A. W. M., B. van der Burg, G. A. Jansen, R. J. A. Wanders, B. T. Poll-The, and P. T. van der Saag. Pristanic acid and phytanic acid: naturally occurring ligands for the nuclear receptor peroxisome proliferator-activated receptor . J. Lipid Res. 2000. 41: 1801;1807.
Supplementary key words:
natural ligand, peroxisomal disorder, retinoic X receptor, phytol derivatives

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Copyright © 2000 by the American Society for Biochemistry and Molecular Biology.
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