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Research ArticleArticle

Ligand-Mediated Regulation of Peroxisome Proliferator-Activated Receptor (PPAR) β/δ: A Comparative Analysis of PPAR-Selective Agonists and All-trans Retinoic Acid

Markus Rieck, Wolfgang Meissner, Simone Ries, Sabine Müller-Brüsselbach and Rolf Müller
Molecular Pharmacology November 2008, 74 (5) 1269-1277; DOI: https://doi.org/10.1124/mol.108.050625
Markus Rieck
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Wolfgang Meissner
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Simone Ries
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Sabine Müller-Brüsselbach
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Rolf Müller
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Abstract

Peroxisome proliferator-activated receptors (PPARs) are members of the nuclear hormone receptor superfamily that modulate target gene expression in response to natural fatty acid ligands and synthetic agonists. It is noteworthy that all trans-retinoic acid (atRA) has recently been reported to act as a ligand for PPARβ/δ, to activate its transcriptional activity, and, in contrast to the “classic” function of atRA, to stimulate cell proliferation (Schug et al., 2007). Here, we report that in contrast to synthetic PPARβ/δ agonists, atRA failed to induce the transcriptional activity of PPARβ/δ using different types of reporter gene assays. Likewise, atRA did not affect the expression of the bona fide PPARβ/δ target genes ADRP and ANGPTL4 but strongly increased expression of the retinoic acid target gene CYP26A under the identical experimental conditions. Consistent with these observations, atRA did not compete with established PPARβ/δ agonists in a ligand binding assay, and atRA did not enable the interaction of PPARβ/δ with a coactivator peptide in a time-resolved fluorescence resonance energy transfer assay in vitro. These results are in sharp contrast to the effect of established PPARβ/δ agonists in both in vitro assays. Taken as a whole, these data strongly suggest that atRA does not function as a ligand of PPARβ/δ in any of the experimental systems tested and that the previously reported atRA effects are more likely to reflect an uncharacterized and less direct mechanism.

Footnotes

  • This work was supported by the Deutsche Forschungsgemeinschaft (SFB-TR17).

  • M.R. and W.M. and contributed equally to this work.

  • ABBREVIATIONS: PPAR, peroxisome proliferator-activated receptor; PPRE, peroxisome proliferator response element; RXR, retinoid X receptor; GW501516, 2-methyl-4-((4-methyl-2-(4-trifluoromethylphenyl)-1,3-thiazol-5-yl)-methylsulfanyl)phenoxy-acetic acid; RA, retinoic acid; RAR, retinoic acid receptor; atRA, all-trans retinoic acid; LBD, ligand binding domain; PBS, phosphate-buffered saline; 9-cis RA, 9-cis retinoic acid; GW1929, (2S)-((2-benzoylphenyl)amino-3-(4-[2-(methylpyridin-2-ylamino)ethoxy]phenyl)propionic acid; AA, arachidonic acid; Ro 13-7410, 4-[E-2-(5,6,7,8-tetrahydro-5,5,8,8-tetramethyl-2-naphthalenyl)-1-propenyl]benzoic acid (TTNPB); HEK, human embryonic kidney; PCR, polymerase chain reaction; TR-FRET, time-resolved fluorescence resonance energy transfer; ADRP, adipocyte differentiation-related protein; Angptl4, angiopoietin-like protein 4.

    • Received July 16, 2008.
    • Accepted August 13, 2008.
  • The American Society for Pharmacology and Experimental Therapeutics
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Molecular Pharmacology: 74 (5)
Molecular Pharmacology
Vol. 74, Issue 5
1 Nov 2008
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Research ArticleArticle

Ligand-Mediated Regulation of Peroxisome Proliferator-Activated Receptor (PPAR) β/δ: A Comparative Analysis of PPAR-Selective Agonists and All-trans Retinoic Acid

Markus Rieck, Wolfgang Meissner, Simone Ries, Sabine Müller-Brüsselbach and Rolf Müller
Molecular Pharmacology November 1, 2008, 74 (5) 1269-1277; DOI: https://doi.org/10.1124/mol.108.050625

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Research ArticleArticle

Ligand-Mediated Regulation of Peroxisome Proliferator-Activated Receptor (PPAR) β/δ: A Comparative Analysis of PPAR-Selective Agonists and All-trans Retinoic Acid

Markus Rieck, Wolfgang Meissner, Simone Ries, Sabine Müller-Brüsselbach and Rolf Müller
Molecular Pharmacology November 1, 2008, 74 (5) 1269-1277; DOI: https://doi.org/10.1124/mol.108.050625
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