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Rubus Crataegifolius Bunge Regulates Adipogenesis Through Akt and Inhibits High-Fat Diet-Induced Obesity in Rats

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Rubus Crataegifolius Bunge Regulates Adipogenesis Through Akt and Inhibits High-Fat Diet-Induced Obesity in Rats Touro Scholar NYMC Faculty Publications Faculty 4-27-2016 Rubus Crataegifolius Bunge Regulates Adipogenesis Through Akt and Inhibits High-Fat Diet-Induced Obesity in Rats Min-Sup Jung Soo-Jung Lee Yuno Song Sun-Hee Jang Wongi Min See next page for additional authors Follow this and additional works at: https://touroscholar.touro.edu/nymc_fac_pubs Part of the Environmental Health Commons Recommended Citation Jung, M. S., Lee, S. J., Song, Y., Jang, S. H., Min, W., Won, C. K., et al. (2016). Rubus crataegifolius bunge regulates adipogenesis through akt and inhibits high-fat diet-induced obesity in rats. Nutrition & Metabolism, 13, 29. doi:10.1186/s12986-016-0091-0 This Article is brought to you for free and open access by the Faculty at Touro Scholar. It has been accepted for inclusion in NYMC Faculty Publications by an authorized administrator of Touro Scholar. For more information, please contact [email protected]. Authors Min-Sup Jung, Soo-Jung Lee, Yuno Song, Sun-Hee Jang, Wongi Min, Chung-Kil Won, Hong-Duck Kim, Tae Hoon Kim, and Jae-Hyeon Cho This article is available at Touro Scholar: https://touroscholar.touro.edu/nymc_fac_pubs/39 Jung et al. Nutrition & Metabolism (2016) 13:29 DOI 10.1186/s12986-016-0091-0 RESEARCH Open Access Rubus crataegifolius Bunge regulates adipogenesis through Akt and inhibits high-fat diet-induced obesity in rats Min-Sup Jung1†, Soo-Jung Lee2†, Yuno Song1, Sun-Hee Jang1, Wongi Min1, Chung-Kil Won1, Hong-Duck Kim3, Tae Hoon Kim4 and Jae-Hyeon Cho1,5* Abstract Background: Obesity is one of the greatest public health problems and major risk factors for serious metabolic diseases and significantly increases the risk of premature death. The aim of this study was to determine the inhibitory effects of Rubus crataegifolius Bunge (RCB) on adipocyte differentiation in 3 T3-L1 cells and its anti-obesity properties in high fat diet (HFD)-induced obese rats. Methods: 3 T3-L1 adipocytes and HFD-induced obese rats were treated with RCB, and its effect on gene expression was analyzed using RT-PCR and Western blotting experiments. Results: RCB treatment significantly inhibited adipocyte differentiation by suppressing the expression of C/EBPβ,C/ EBPα, and PPARγ in the 3 T3-L1 adipocytes. Subsequently, the expression of the PPARγ target genes aP2 and fatty acid synthase (FAS) decreased following RCB treatment during adipocyte differentiation. In uncovering the specific mechanism that mediates the effects of RCB, we demonstrated that the insulin-stimulated phosphorylation of Akt strongly decreased and that its downstream substrate phospho-GSK3β was downregulated following RCB treatment in the 3 T3-L1 adipocytes. Moreover, LY294002, an inhibitor of Akt phosphorylation, exerted stronger inhibitory effects on RCB-mediated suppression of adipocyte differentiation, leading to the inhibition of adipocyte differentiation through the downregulation of Akt signaling. An HFD-induced obesity rat model was used to determine the inhibitory effects of RCB on obesity. Body weight gain and fat accumulation in adipose tissue were significantly reduced by the supplementation of RCB. Moreover, RCB treatment caused a significant decrease in adipocyte size, associated with a decrease in epididymal fat weight. The serum total cholesterol (TC) and triglyceride (TG) levels decreased in response to RCB treatment, whereas HDL cholesterol (HDL-C) increased, indicating that RCB attenuated lipid accumulation in adipose tissue in HFD-induced obese rats. Conclusion: Our results demonstrate an inhibitory effect of RCB on adipogenesis through the reduction of the adipogenic factors PPARγ,C/EBPα, and phospho-Akt. RCB had a potent anti-obesity effect, reducing body weight gain in HFD-induced obese rats. Keywords: Rubus crataegifolius Bunge (RCB), 3 T3-L1 adipocyte, Adipogenesis, Akt, High fat diet, Obesity * Correspondence: [email protected] †Equal contributors 1Institute of Animal Medicine, College of Veterinary Medicine, Gyeongsang National University, Jinju 660-701, Korea 5College of Veterinary Medicine, Gyeongsang National University, Jiju Daero 501, Jinju-city, Gyeongsangnamdo 660-701, Korea Full list of author information is available at the end of the article © 2016 Jung et al. Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated. Jung et al. Nutrition & Metabolism (2016) 13:29 Page 2 of 14 Background fresh and processed food items, such as jams, jellies and Obesity arises from adipocyte hyperplasia and hyper- juices, represents a multimillion dollar industry [18], their trophy caused by the intake of excess energy [1]. Excess medicinal properties—including their anti-inflammatory fat accumulates in adipocytes as excessive amounts of effects on ulcers and their capacity to reduce blood chol- lipids (triglycerides), resulting in elevated triglyceride esterol levels [19] and cell proliferation [20] in animal levels in plasma and in tissues such as liver and muscle, models—have recently attracted the attention of the inter- which leads to pathological dysfunction in these tissues national market. However, no reports documenting the [2, 3]. Thus, adipocyte hyperplasia may be an important anti-obesity effects of RCB have been published. factor in the development of obesity. To prevent obesity, In this study, we hypothesized that RCB could exert it is important to maintain an adequate balance between the inhibitory effect on the differentiation of 3 T3-L1 energy accumulation and energy consumption. preadipocytes and its in vivo inhibition of high fat diet The excessive accumulation of adipose tissue is caused (HFD)-induced obesity in rats. To study this possibility, by increased adipogenesis accompanied by adipocyte dif- the inhibitory effects of RCB on differentiation of 3 T3-L1 ferentiation, which converts immature pre-adipocytes into preadipocytes into adipocytes was examined by measuring adipocytes. Abnormal fat accumulation and adipocyte triglyceride accumulation levels and expression levels of differentiation in adipose tissue are associated with the de- genes involved in adipogenesis and lipogenesis in adipo- velopment of obesity [4]. Adipogenesis, the process of adi- cytes. We also investigated the underlying mechanism pose cell development, is associated with multiple steps in whether Akt signaling is critical for the anti-obesity func- the regulation of several transcription factors. During the tion of RCB. Moreover, we examined the effects of RCB differentiation process, many key transcriptional factors on body weight, adipose tissue mass, and lipid metabolism are involved, such as CCAAT-enhancer-binding protein in HFD-induced obese rats. (C/EBP)-δ and C/EBPβ, which can collectively induce the expression of peroxisome proliferator-activated receptor Methods (PPAR)-γ and C/EBPα [5, 6]. PPARγ and C/EBPα also play Preparation of Rubus crataegifolius Bunge (RCB) extracts important roles as major transcription factors in adipo- The fresh fruits of Rubus crataegifolius Bunge (RCB) genesis [5]. In addition, these transcription factors are were collected in Gyeongsan-si, Gyeongsangbuk-do, involved in the acceleration of lipogenesis and lipid Korea in September 2013. A voucher specimen repre- homeostasis by modulating the expression of target genes, senting this collection was identified by Prof. Gon-Sup such as adipocyte fatty acid-binding protein 2 (aP2) and Kim and deposited at the Animal Bio Resources Bank of fatty acid synthase (FAS) [7]. Gyeongsang National University. The fresh fruits of RCB The intracellular signaling cascade involving insulin/ were prepared by alcohol extraction. The fruit bodies phosphoinositide 3-kinase (PI3K)/Akt plays a major role were peeled off and air-dried in an oven at an initial in adipocyte differentiation. Akt phosphorylates and regu- temperature of 30 °C, which was increased by 5 °C every lates a number of substrates that are involved in a diverse 3 h until it reached 40 °C. The dried fruit bodies of RCB array of biological processes [8], and it is essential in the were milled into a powder (40 mesh). Fifteen grams of induction of PPARγ expression [9]. Pharmacological in- RCB powder were then suspended in an 80 % (v/v) etha- hibition of the PI3K/Akt signaling pathway [10, 11] and nol solution using a mixer, followed by the extraction of dominant negative mutations [12] can abolish adipocyte the samples for 3 days with vigorous shaking at room differentiation by inhibiting PI3K/Akt activity. Moreover, temperature and filtering through Whatman No. 1 filter the overexpression of constitutively active Akt increases paper. The 80 % ethanol extracts of RCB were concen- glucose uptake and adipocyte differentiation in 3 T3-L1 trated using rotary-vacuum evaporation at 50 °C and adipocytes [13]. then freeze-dried. The RCB extract was stored in the Rubus crataegifolius Bunge (RCB) is a type of red rasp- freezer until it was used for experiments. berry and is a member of the Rosaceae family. Rubus is one of the most diverse and largest genera in the Rosaceae family and is comprised
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