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Honokiol enhances adipocyte differentiation by potentiating insulin signaling in 3T3-L1 preadipocytes

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Abstract

Adipose tissue plays an essential role in energy homeostasis as a metabolic and endocrine organ. Accordingly, adipocytes are emerging as a major drug target for obesity and obesity-mediated metabolic syndrome. Dysfunction of enlarged adipocytes in obesity is involved in obesity-mediated metabolic syndrome. Adipocytokines, such as adiponectin released from small adipocytes, are able to prevent these disorders. In this study, we found that honokiol, an ingredient of Magnolia officinalis used in traditional Chinese and Japanese medicines, enhanced adipocyte differentiation in 3T3-L1 preadipocytes. Oil Red O staining showed that treatment with honokiol in the presence of insulin dose-dependently increased lipid accumulation in 3T3-L1 preadipoyctes although its activity was weak compared with rosiglitazone. During adipocyte differentiation, the expression of peroxisome proliferator-activated receptor γ2 (PPARγ2) mRNA and PPARγ target genes such as adipocyte protein 2 (aP2), adiponectin, and GLUT4 was induced by treatment with 10 μM honokiol. However, honokiol failed to show direct binding to the PPARγ ligand-binding domain in vitro. In preadipocytes, treatment with honokiol in the presence of insulin increased the phosphorylation of extracellular signal-regulated kinase (ERK) 1/2 protein and Akt protein, early insulin signaling pathways related to adipocyte differentiation, compared with insulin-only treatment. Taken together, our results suggest that honokiol promotes adipocyte differentiation through increased expression of PPARγ2 mRNA and potentiation of insulin signaling pathways such as the Ras/ERK1/2 and phosphoinositide-3-kinase (PI3K)/Akt signaling pathways.

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Authors and Affiliations

  1. Research Institute for Biological Functions, Chubu University, 1200 Matsumoto, Kasugai, Aichi, 487-8501, Japan

    Sun-Sil Choi, Byung-Yoon Cha, Kagami Iida, Young-Sil Lee, Toshiaki Teruya, Takayuki Yonezawa, Kazuo Nagai & Je-Tae Woo

  2. Department of Biological Chemistry, Chubu University, 1200 Matsumoto, Kasugai, Aichi, 487-8501, Japan

    Masako Sato, Kazuo Nagai & Je-Tae Woo

  3. Department of Research and Development, Erina Co., Inc, 1-9-2 Higashi-Shinbashi, Minato-ku, Tokyo, 105-0021, Japan

    Je-Tae Woo

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  1. Sun-Sil Choi
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  2. Byung-Yoon Cha
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Correspondence to Je-Tae Woo.

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Choi, SS., Cha, BY., Iida, K. et al. Honokiol enhances adipocyte differentiation by potentiating insulin signaling in 3T3-L1 preadipocytes. J Nat Med 65, 424–430 (2011). https://doi.org/10.1007/s11418-011-0512-3

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  • DOI: https://doi.org/10.1007/s11418-011-0512-3

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