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Molecular Pharmacology

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Research ArticleArticle

Evidence for Peroxisome Proliferator-Activated Receptor (PPAR)α-Independent Peroxisome Proliferation: Effects of PPARγ/δ-Specific Agonists in PPARα-Null Mice

John G. DeLuca, Thomas W. Doebber, Linda J. Kelly, Ramon K. Kemp, Sylvain Molon-Noblot, Soumya P. Sahoo, John Ventre, Margaret S. Wu, Jeffrey M. Peters, Frank J. Gonzalez and David E. Moller
Molecular Pharmacology September 2000, 58 (3) 470-476; DOI: https://doi.org/10.1124/mol.58.3.470
John G. DeLuca
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Thomas W. Doebber
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Linda J. Kelly
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Ramon K. Kemp
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Sylvain Molon-Noblot
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Soumya P. Sahoo
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John Ventre
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Margaret S. Wu
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Jeffrey M. Peters
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Frank J. Gonzalez
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David E. Moller
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Abstract

Peroxisome proliferators are a diverse group of compounds that cause hepatic hypertrophy and hyperplasia, increase peroxisome number, and on chronic high-dose administration, lead to rodent liver tumorigenesis. Various lines of evidence have led to the conclusion that these agents induce their pleiotropic effects exclusively via agonism of peroxisome proliferator-activated receptor (PPAR)α, a member of the steroid receptor superfamily involved in the regulation of fatty acid metabolism. Recently, agonists of two other members of this receptor family have been identified. PPARγ is predominantly expressed in adipocytes where it mediates differentiation; PPARδ is a widely expressed orphan receptor with yet unresolved physiologic functions. In the course of characterizing newer PPAR ligands, we noted that highly selective PPARγ agonists or dual PPARγ/PPARδ agonists, lacking apparent murine PPARα agonist activity, cause peroxisome proliferation in CD-1 mice. We therefore made use of PPARα knockout mice to investigate whether these effects resulted from agonism of PPARα by these agents at very high dose levels or whether PPARγ (or PPARδ) agonism alone can result in peroxisome proliferation. We report here that several parameters linked to the hepatic peroxisome proliferation response in mice that were seen with these agents resulted from PPARα-independent effects.

Footnotes

    • Received February 2, 2000.
    • Accepted June 15, 2000.
  • Send reprint requests to: John G. DeLuca, WP45-302, Merck Research Labs, West Point, PA 19438. E-mail:delucaj{at}merck.com

  • The American Society for Pharmacology and Experimental Therapeutics
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Molecular Pharmacology: 58 (3)
Molecular Pharmacology
Vol. 58, Issue 3
1 Sep 2000
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Research ArticleArticle

Evidence for Peroxisome Proliferator-Activated Receptor (PPAR)α-Independent Peroxisome Proliferation: Effects of PPARγ/δ-Specific Agonists in PPARα-Null Mice

John G. DeLuca, Thomas W. Doebber, Linda J. Kelly, Ramon K. Kemp, Sylvain Molon-Noblot, Soumya P. Sahoo, John Ventre, Margaret S. Wu, Jeffrey M. Peters, Frank J. Gonzalez and David E. Moller
Molecular Pharmacology September 1, 2000, 58 (3) 470-476; DOI: https://doi.org/10.1124/mol.58.3.470

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Research ArticleArticle

Evidence for Peroxisome Proliferator-Activated Receptor (PPAR)α-Independent Peroxisome Proliferation: Effects of PPARγ/δ-Specific Agonists in PPARα-Null Mice

John G. DeLuca, Thomas W. Doebber, Linda J. Kelly, Ramon K. Kemp, Sylvain Molon-Noblot, Soumya P. Sahoo, John Ventre, Margaret S. Wu, Jeffrey M. Peters, Frank J. Gonzalez and David E. Moller
Molecular Pharmacology September 1, 2000, 58 (3) 470-476; DOI: https://doi.org/10.1124/mol.58.3.470
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