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Mol. Cell. Biol., Jun 1995, 3012-3022, Vol 15, No. 6
SS Lee, T Pineau, J Drago, EJ Lee, JW Owens, DL Kroetz, PM Fernandez-Salguero, H Westphal and FJ Gonzalez
To gain insight into the function of peroxisome proliferator-activated
receptor (PPAR) isoforms in rodents, we disrupted the ligand-binding domain
of the alpha isoform of mouse PPAR (mPPAR alpha) by homologous
recombination. Mice homozygous for the mutation lack expression of mPPAR
alpha protein and yet are viable and fertile and exhibit no detectable
gross phenotypic defects. Remarkably, these animals do not display the
peroxisome proliferator pleiotropic response when challenged with the
classical peroxisome proliferators, clofibrate and Wy-14,643. Following
exposure to these chemicals, hepatomegaly, peroxisome proliferation, and
transcriptional-activation of target genes were not observed. These results
clearly demonstrate that mPPAR alpha is the major isoform required for
mediating the pleiotropic response resulting from the actions of peroxisome
proliferators. mPPAR alpha-deficient animals should prove useful to further
investigate the role of this receptor in hepatocarcinogenesis, fatty acid
metabolism, and cell cycle regulation.
Copyright © 1995, American Society for Microbiology
Targeted disruption of the alpha isoform of the peroxisome proliferator- activated receptor gene in mice results in abolishment of the pleiotropic effects of peroxisome proliferators
Laboratory of Molecular Carcinogenesis, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892, USA.
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