Effect of Peroxisome Proliferator-activated Receptor-α Ligands in the Interaction Between Adipocytes and Macrophages in Obese Adipose Tissue

Authors

  • Takuya Toyoda,

    1. Department of Molecular Medicine and Metabolism, Medical Research Institute, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo, Japan
    2. Center of Excellence Program for Frontier Research on Molecular Destruction and Reconstitution of Tooth and Bone, Medical Research Institute, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo, Japan
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  • Yasutomi Kamei,

    1. Department of Molecular Medicine and Metabolism, Medical Research Institute, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo, Japan
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  • Hirotsugu Kato,

    1. Department of Molecular Medicine and Metabolism, Medical Research Institute, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo, Japan
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  • Satoshi Sugita,

    1. Department of Molecular Medicine and Metabolism, Medical Research Institute, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo, Japan
    2. Center of Excellence Program for Frontier Research on Molecular Destruction and Reconstitution of Tooth and Bone, Medical Research Institute, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo, Japan
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  • Motohiro Takeya,

    1. Department of Cell Pathology, Graduate School of Medical Sciences, Kumamoto University, Honjo, Kumamoto, Japan
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  • Takayoshi Suganami,

    1. Department of Molecular Medicine and Metabolism, Medical Research Institute, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo, Japan
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  • Yoshihiro Ogawa

    Corresponding author
    1. Department of Molecular Medicine and Metabolism, Medical Research Institute, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo, Japan
    2. Center of Excellence Program for Frontier Research on Molecular Destruction and Reconstitution of Tooth and Bone, Medical Research Institute, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo, Japan
      (ogawa.mmm@mri.tmd.ac.jp)
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(ogawa.mmm@mri.tmd.ac.jp)

Abstract

Objective: This study was designed to examine the effect of peroxisome proliferator-activated receptor-α (PPAR-α) ligands on the inflammatory changes induced by the interaction between adipocytes and macrophages in obese adipose tissue.

Methods and Procedures: PPAR-α ligands (Wy-14,643 and fenofibrate) were added to 3T3-L1 adipocytes, RAW264 macrophages, or co-culture of 3T3-L1 adipocytes and RAW264 macrophages in vitro, and monocyte chemoattractant protein-1 (MCP-1) and tumor necrosis factor-α (TNF-α) mRNA expression and secretion were examined. PPAR-α ligands were administered to genetically obese ob/ob mice for 2 weeks. Moreover, the effect of PPAR-α ligands was also evaluated in the adipose tissue explants and peritoneal macrophages obtained from PPAR-α-deficient mice.

Results: In the co-culture of 3T3-L1 adipocytes and RAW264 macrophages, PPAR-α ligands reduced MCP-1 and TNF-α mRNA expression and secretion in vitro relative to vehicle-treated group. The anti-inflammatory effect of Wy-14,643 was observed in adipocytes treated with macrophage-conditioned media or mouse recombinant TNF-α and in macrophages treated with adipocyte-conditioned media or palmitate. Systemic administration of PPAR-α ligands inhibited the inflammatory changes in adipose tissue from ob/ob mice. Wy-14,643 also exerted an anti-inflammatory effect in the adipose tissue explants but not in peritoneal macrophages obtained from PPAR-α-deficient mice.

Discussion: This study provides evidence for the anti-inflammatory effect of PPAR-α ligands in the interaction between adipocytes and macrophages in obese adipose tissue, thereby improving the dysregulation of adipocytokine production and obesity-related metabolic syndrome.

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