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01-07-2011 | Original Paper

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

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

Published in: Journal of Natural Medicines | Issue 3-4/2011

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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Title: Honokiol enhances adipocyte differentiation by potentiating insulin signaling in 3T3-L1 preadipocytes
Authors: Sun-Sil Choi
Byung-Yoon Cha
Kagami Iida
Masako Sato
Young-Sil Lee
Toshiaki Teruya
Takayuki Yonezawa
Kazuo Nagai
Je-Tae Woo
Publication date: 01-07-2011
Publisher: Springer Japan
Published in: Journal of Natural Medicines / Issue 3-4/2011
Print ISSN: 1340-3443
Electronic ISSN: 1861-0293
DOI: https://doi.org/10.1007/s11418-011-0512-3

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

Abstract

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Abstract

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