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The Effect of Methanolic Valeriana officinalis Root Extract on Adipocyte Differentiation and Adiponectin Production in 3T3-L1 Adipocytes

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Abstract

Adipose tissue is an endocrine organ and its endocrine function is closely associated with type 2 diabetes mellitus. Valeriana officinalis (Valerian) exerts some physiological effects; however, its influence on adipocytes remains unclear. We investigated the effect of methanolic Valerian root extract (Vale) on 3T3-L1 adipocytes. Vale (1, 10, and 100 μg/mL) dose-dependently promoted adipocyte differentiation with increasing lipid accumulation. In addition, Vale significantly increased the mRNA levels in genes associated with adipocyte differentiation, including peroxisome proliferator-activated receptor γ (PPARγ), CCAAT/enhancer-binding protein α , and adipocyte protein 2, in dose-dependent manner. Vale also significantly enhanced mRNA and protein levels in adiponectin. A PPARγ antagonist assay and a PPARγ binding assay revealed that Vale-induced increased adipocyte differentiation and adiponectin production were partly associated with direct binding to PPARγ. Valerenic acid, a characteristic component in Valerian, also demonstrated the ability to induce adipocyte differentiation and adiponectin secretion, suggesting that it is one of the functional components in Vale.

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Abbreviations

BADGE:

bisphenol a diglycidyl ether

C/EBPα:

CCAAT/enhancer-binding protein α

DMEM:

Dulbecco’s modified Eagle’s medium (high glucose) with L-glutamine, phenol red, and sodium pyruvate

DMSO:

dimethyl sulfoxide

MTT:

3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide

PPARα:

peroxisome proliferator-activated receptor α

PPARγ:

peroxisome proliferator-activated receptor γ

Rosi:

Rosiglitazone

SE:

standard error

Vale:

methanolic Valerian root extract

Valerian:

Valeriana officinalis

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Funding

This study was partly funded by The Foundation for Dietary Scientific Research (granted to Kazuo Kobayashi-Hattori).

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Correspondence to Kazuo Kobayashi-Hattori.

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Harada, K., Kato, Y., Takahashi, J. et al. The Effect of Methanolic Valeriana officinalis Root Extract on Adipocyte Differentiation and Adiponectin Production in 3T3-L1 Adipocytes. Plant Foods Hum Nutr 75, 103–109 (2020). https://doi.org/10.1007/s11130-019-00790-2

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