Loss of hepatic PPARα promotes inflammation and serum hyperlipidemia in diet-induced obesity
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- David E. Stec
- Department of Physiology & Biophysics, Mississippi Center for Obesity Research, University of Mississippi Medical Center, Jackson, Mississippi
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- Darren M. Gordon
- Department of Physiology and Pharmacology, University of Toledo College of Medicine, Toledo, Ohio
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- Jennifer A. Hipp
- Department of Pathology, University of Toledo College of Medicine, Toledo, Ohio
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- Stephen Hong
- Department of Physiology and Pharmacology, University of Toledo College of Medicine, Toledo, Ohio
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- Zachary L. Mitchell
- Department of Physiology & Biophysics, Mississippi Center for Obesity Research, University of Mississippi Medical Center, Jackson, Mississippi
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- Natalia R. Franco
- Department of Physiology & Biophysics, Mississippi Center for Obesity Research, University of Mississippi Medical Center, Jackson, Mississippi
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- J. Walker Robison
- Department of Physiology & Biophysics, Mississippi Center for Obesity Research, University of Mississippi Medical Center, Jackson, Mississippi
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- Christopher D. Anderson
- Department of Surgery and Medicine, University of Mississippi Medical Center, Jackson, Mississippi
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- Donald F. Stec
- Small Molecule NMR Facility Core, Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee
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- Terry D. Hinds
- Department of Physiology and Pharmacology, University of Toledo College of Medicine, Toledo, Ohio
抄録
<jats:p> Agonists for PPARα are used clinically to reduce triglycerides and improve high-density lipoprotein (HDL) cholesterol levels in patients with hyperlipidemia. Whether the mechanism of PPARα activation to lower serum lipids occurs in the liver or other tissues is unknown. To determine the function of hepatic PPARα on lipid profiles in diet-induced obese mice, we placed hepatocyte-specific peroxisome proliferator-activated receptor-α (PPARα) knockout ( Ppara<jats:sup>HepKO</jats:sup>) and wild-type ( Ppara<jats:sup>fl/fl</jats:sup>) mice on high-fat diet (HFD) or normal fat diet (NFD) for 12 wk. There was no significant difference in weight gain, percent body fat mass, or percent body lean mass between the groups of mice in response to HFD or NFD. Interestingly, the Ppara<jats:sup>HepKO</jats:sup> mice on HFD had worsened hepatic inflammation and a significant shift in the proinflammatory M1 macrophage population. These changes were associated with higher hepatic fat mass and decreased hepatic lean mass in the Pparα<jats:sup>HepKO</jats:sup> on HFD but not in NFD as measured by Oil Red O and noninvasive EchoMRI analysis (31.1 ± 2.8 vs. 20.2 ± 1.5, 66.6 ± 2.5 vs. 76.4 ± 1.5%, P < 0.05). We did find that this was related to significantly reduced peroxisomal gene function and lower plasma β-hydroxybutyrate in the Ppara<jats:sup>HepKO</jats:sup> on HFD, indicative of reduced metabolism of fats in the liver. Together, these provoked higher plasma triglyceride and apolipoprotein B100 levels in the Ppara<jats:sup>HepKO</jats:sup> mice compared with Ppara<jats:sup>fl/fl</jats:sup> on HFD. These data indicate that hepatic PPARα functions to control inflammation and liver triglyceride accumulation that prevent hyperlipidemia. </jats:p>
収録刊行物
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- American Journal of Physiology-Regulatory, Integrative and Comparative Physiology
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American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 317 (5), R733-R745, 2019-11-01
American Physiological Society