Seo, Cho-Rong;Byun, Jong Seon;An, Jae Jin;Lee, JaeHwan;Hong, Joung-Woo;Jang, Sang Ho;Park, Kye Won
Journal of the Korean Society of Food Science and Nutrition
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v.42
no.7
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pp.1015-1021
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2013
Glycyrrhiza inflata Batal, an important species of licorice, is one of the most widely used medicinal plants for over 4000 years. Glycyrrhiza plant species has been well known for its various therapeutic activities such as anti-inflammatory, anti-allergic, and anti-ulcer. The purpose of this study was to determine the effects of Glycyrrhiza inflata Batal ethanol extracts (GBE) on adipocyte and osteoblast differentiation. Mesenchymal C3H10T1/2 cells were treated with sub-cytotoxic doses of GBE, and its effects on adipocyte differentiation were assessed. We found that GBE dose-dependently increased lipid accumulation and also induced the expression of adipocyte markers, such as $PPAR{\gamma}$ and its target genes, aP2, and adiponectin, in C3H10T1/2 cells. Consistently, similar effects of GBE on lipid accumulation were also observed in preadipocyte 3T3-L1 cells that further supports the pro-adipogenic activities of GBE. We also investigated the effects of GBE on osteoblast differentiation of mesenchymal C3H10T1/2 cells. As a results, we found that GBE increased the activity of alkaline phosphatase in a dose-dependent manner and also promoted the expression of osteoblast markers, such as ALP and RUNX2, during osteoblast differentiation of C3H10T1/2 cells. Similar pro-osteogenic effects of GBE were also observed in preosteoblast MC3T3-E1 cells. Finally, our data show that a major bioactive compound found in Glycyrrhiza inflata Batal, licochalcone A (LA) but not glycyrrhizic acid (GA), can mediate the pro-adipogenic and pro-osteogenic effects of GBE. Taken together, this study provides data to show the possibility of GBE and its bioactive component LA as putative strategies for type 2 diabetes and bone diseases.
Undaria pinnatifada has been used as a natural diet food with few calories and as a source of iodine. Even though U. pinnatifida has been regarded as a diet food, the mechanisms of its inhibitory effects on adipocyte differentiation and the accumulation of fat in adipocytes are poorly understood. In this study, the effect and mechanism of U. pinnatifida ethanol extract on 3T3-L1 differentiation into adipocytes were investigated. The effects of U. pinnatifida ethanol extract on cell viability and the anti-adipogenic effect were investigated via MTT assay, Oil red O staining, RT-PCR, and western blot. The U. pinnatifida ethanol extract did not show toxicity up to a concentration of 50 ${\mu}g/ml$. The addition of U. pinnatifida ethanol extract decreased triglyceride contents by 40% when 50 ${\mu}g/ml$ of U. pinnatifida ethanol extract was added during 3T3-L1 differentiation and adipocyte triglyceride formation. The transcription and expression of peroxisome proliferator-activated receptor ${\gamma}$ ($PPAR{\gamma}$), leptin, and hormone-sensitive lipase (HSL) as adipocyte-specific proteins were determined by RT-PCR and western blot. The overexpression of $PPAR{\gamma}$ could accelerate adipocyte differentiation. Also, leptin was secreted for triglyceride accumulation in the adipocytes and the increase of adipocyte cell size. Thus, $PPAR{\gamma}$ and leptin were used as indicators of obesity. $PPAR{\gamma}$ and leptin were repressed by the increased addition of U. pinnatifida ethanol extract. This indicates that U. pinnatifida was effective as an anti-obesity agent by repressing the differentiation of 3T3-L1 into adipocytes and inhibiting triglyceride formation in adipocytes.
Journal of the Korean Society of Food Science and Nutrition
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v.43
no.11
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pp.1688-1694
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2014
Jeju Hallabong Tangor (Citrus kiyomi${\times}$ponkan) is a Citrus species with a variety of physiological properties such as anti-oxidant, anti-inflammation, anti-cancer, and anti-obesity. We investigated the anti-obesity effects of Hallabong Tangor peel extracts before (HLB) and after (HLB-C) bioconversion with cytolase based on modulation of adipocyte differentiation and lipid metabolism in 3T3-L1 adipocytes. Treatment with cytolase decreased flavanone rutinoside forms (narirutin and hesperidin) and increased flavanone aglycone forms (naringenin and hesperetin). During adipocyte differentiation, 3T3-L1 cells were treated with 0.5 mg/mL of Sinetrol (a positive control), HLB or HLB-C. Adipocyte differentiation was inhibited in both citrus groups, but not in control and Sinetriol groups. HLB and HLB-C tended to reduce insulin-induced mRNA levels of CCAAT/enhancer-binding protein ${\alpha}$ ($C/EBP{\alpha}$) and sterol regulatory element-binding protein 1c (SREBP1c). Compared to the control and Sinetrol groups, HLB and HLB-C markedly suppressed insulin-induced protein expression of $C/EBP{\alpha}$ and peroxisome proliferator-activated receptor gamma ($PPAR{\gamma}$). The HLB and Sinetrol groups, but not HLB-C group, significantly increased adipolytic activity with higher release of free glycerol compared to the control group in differentiated 3T3-L1 adipocytes. These results suggest that bio-conversion of Hallabong Tangor peel extracts with cytolase increases aglycone flavonoids. Irrespective of bioconversion, both Hallabong Tangor peel extracts exert anti-obesity effects that may contribute to prevention of obesity through inhibition of adipocyte differentiation or induction of adipolytic activity.
Kim, Yonggyun;Lee, Seunghee;Seo, Seunghwan;Kim, Kunwoo
Korean journal of applied entomology
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v.55
no.2
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pp.129-138
/
2016
Eicosanoids are a group of C20 oxygenated polyunsaturated fatty acids (PUFAs). To monitor biosynthetic precursors of these PUFAs, this study extracted fatty acids from different tissues of the beet armyworm, Spodoptera exigua, and assessed their compositions using GC/MS. Fifth instar larvae were dissected to isolate different tissues of gut, fat body, hemocytes, and integument. From each tissue, total lipids were extracted and fractionated into neutral lipid (NL), glycolipid (GL), and phospholipid (PL). Most tissues contained palmitic acid (16:0), stearic acid (18:0), oleic acid (18:1), linoleic acid (18:2), and linolenic acid (18:3). However, their compositions were different among tissues and lipid types. Fat body and hemocytes possessed other type of fatty acids such as myristic acid (14:0) and three unknown fatty acids. Among lipid types, PL contained relatively high levels of linolenic acid than NL and GL, while it had lower saturated fatty acids. Total unsaturated fatty acid composition was varied among tissues and lipid types. PL was rich in unsaturated fatty acids in fat body, gut, and hemocytes. There was a significant influence of calcium-independent phospholipase $A_2$ ($iPLA_2$) on maintaining fatty acid composition because RNA interference of $iPLA_2$ expression significantly modified fatty acid compositions in NL and PL. However, this study did not detect arachidonic acid, a main eicosanoid biosynthesis precursor, in all tissues. This suggests an alternative biosynthesis of eicosanoids in insects, which is distinct from the biosynthetic pathway of mammals.
Insulin stimulates the fusion of intracellular vesicles containing glucose transporter 4 (GLUT4) with plasma membrane in adipocytes and muscle cells. Here we show that adipocyte differentiation results in enhanced insulin sensitivity of glucose uptake. On the other hand, glucose uptake in response to platelet-derived growth factor (PDGF) stimulation was markedly reduced by adipocyte differentiation. Expression level of insulin receptor and caveolin-1 was dramatically increased during adipocyte differentiation. Adipocyte differentiation caused :ilightly enhanced activation of acutely transforming retrovirus AKT8 in rodent T cell lymphoma (Akt) by insulin stimulation. However, activation of Akt by PDGF stimulation was largely reduced. Activation of ERK was not detected in both fibroblasts and adipocytes after stimulation with insulin. PDGF-dependent activation of ERK was reduced by adipocyte differentiation. Insulin-dependent glucose uptake was abrogated by LY294002, a phosphatidylinositol 3-kinase (PI3K) inhibitor, in both fibroblasts and adipocytes. Also disassembly of caveolae structure by $methyl-\beta-cyclodextrin$ caused impairment of Akt activation and glucose uptake. Finally, insulin receptor, Akt, SH2-domain-containing inositol 5-phosphatase 2 (SHIP2), and regulatory subunit of PI3K are localized at lipid raft domain and the translocation was facilitated upon insulin stimulation. Given these results, we suggest that lipid raft provide proper site for insulin action for glucose uptake.
Kim, Dong-Gyu;Kang, Min Jung;Suh, Hwa Jin;Kwon, Oh Oun;Shin, Jung Hye
Journal of the Korean Society of Food Science and Nutrition
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v.45
no.8
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pp.1107-1113
/
2016
The purpose of this study was to investigate the effects of catechu water extract on adipogenesis in 3T3-L1 adipocytes. 3T3-L1 preadipocytes were differentiated with adipogenic regents by incubation for 9 days in the absence or presence of catechu extract ranging from $1{\sim}200{\mu}g/mL$. The effect of catechu extracts on cell proliferation of 3T3-L1 preadipocytes was investigated using 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay. The effect of catechu extracts on 3T3-L1 differentiation was examined by measuring intracellular lipid droplet and triglyceride contents. These results were obtained from preadipocyte proliferation and adipocyte differentiation of 3T3-L1. Catechu extracts inhibited lipid accumulation and remarkably decreased triglyceride contents in 3T3-L1 preadipocytes at a concentration showing no cytotoxicity. The anti-adipogenic effects of catechu appeared to be mediated by significant down-regulation of expression of peroxisome proliferator-activated receptor ${\gamma}$, CCAAT/enhancer-binding protein ${\alpha}$, and sterol regulatory element-binding protein 1c proteins apart from expression of hormone-sensitive lipase. We suggest that catechu extracts significantly inhibit adipogenesis and can be used for regulation of obesity.
The purpose of the study was to investigate the content of sinigrin, an index component, in Brassica juncea extract and to evaluate the differentiation of lipocytes, inhibition of production of reactive oxygen species (ROS) and reduction of protein production by lipogenic factors (PPARγ, C/EBPα, aP2) in the processing of Brassica juncea extract and sinigrin in 3T3-L1 preadipocytes which induces Bisphenol A (BPA), an endocrine disrupting environmental hormone. From the investigation, the content of sinigrin in Brassica juncea extract, measured by HPLC, is found to be 21.27±0.2 mg/g. The XTT assay result on BPA-derived 3T3-L1 adipocytes shows there is no cytotoxicity found from 180 µM of sinigrin and 300 ㎍/mL of Brassica juncea extract. Moreover, both intracellular lipid accumulation and ROS production during differentiation of lipocyte are significantly reduced in cells processed with Brassica juncea extract and sinigrin. Lastly, it was also found that the production of transcription factors of lipocyte differentiation, PPARγ, C/EBPα and aP2, were found to be suppressed by the application of Brassica juncea extract and sinigrin. Such results reveals that Brassica juncea is effective in not only suppressing lipid accumulation in the environmental hormone bisphenol A-derived lipocyte, but also in reducing the ROS. The sinigrin-containing Brassica juncea is highly expected to be used in natural functional supplements that prevents the lipid metabolism disorders caused by BPA. There are necessities for additional clinical research and follow-up studies on the in vivo model to verify the relevant mechanisms.
Purpose: Obesity is a major health problem of global significance because it is clearly associated with an increased risk of health problems, such as nonalcoholic fatty liver disease (NAFLD), diabetes, cardiovascular diseases, and cancer. Lonicera caerulea (LC) originates from high mountains or wet areas and has been used as a traditional medicine in northern Russia, China, and Japan. LC contains a range of bioactive constituents, such as vitamins, minerals, and polyphenols. This study examined the anti-obesity effects of LC during differentiation in preadipocytes. Methods: The cell viability assay was performed after the differentiation of 3T3-L1 cells for 7 days. Oil Red O staining was used to visualize the changes in lipid droplets in 3T3-L1 cells and mouse adipose-derived stem cells (MADSCs). The mRNA expression of obesity-related genes was determined by quantitative real-time PCR. Results: According to the results of Oil Red O staining, the lipid levels and size of lipid droplets in the adipocytes were reduced and the LC extract (LCE, 0.25-1 mg/mL) markedly inhibited adipogenesis in a dose-dependent manner. The treatment of LCE also decreased the mRNA expression of peroxisome proliferator-activated receptor ${\gamma}$ ($PPAR{\gamma}$), CCAAT/enhancer binding protein-${\alpha}$ ($C/EBP{\alpha}$), and sterol regulatory element binding protein 1 (SREBP1) in 3T3-L1 cells. Western blot analysis showed that the $PPAR{\gamma}$, $C/EBP{\alpha}$, and SREBP1 protein levels in both 3T3-L1 and MADSC were reduced in a dose-dependent manner. Conclusion: These results suggest that LCE can inhibit adipogenic differentiation through the regulation of adipogenesis-related markers.
Kim, Sung-Ok;Kim, Mi-Ryeo;Hwang, Kyung-A;Park, No-Jin;Jeong, Ji-Suk
Journal of the Korean Society of Food Science and Nutrition
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v.46
no.4
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pp.401-408
/
2017
Salvia plebeia R. Br. (Lamiaceae) has been used in folk medicines in Asian countries, including Korea and China, to treat inflammatory diseases. The focus of our research was on the anti-adipogenic activity of ethanol extract from Salvia plebeia R. Br. (SPE) in 3T3-L1 adipocytes. This study investigated inhibition of differentiation and lipogenesis upon SPE treatment in 3T3-L1 cells. The results reveal that SPE at non-cytotoxic concentration significantly suppressed triglyceride accumulation and reduced expression of peroxisome proliferator-activated receptor gamma, CCAAT/enhancer-binding protein-alpha, and sterol regulatory element-binding protein as adipogenic transcription factors in 3T3-L1 adipocytes compared to non-treated control cells. Inducible phosphorylation of AMP-activated protein kinase, acetyl CoA carboxylase, and hormone-sensitive lipase as well as carnitine palmitoyltransferase-1 mRNA expression increased upon SPE treatment, which suppressed expression of fatty acid synthase. In conclusion, these results demonstrate that SPE can inhibit expression of adipogenic genes in 3T3-L1 adipocytes. Our study suggests that SPE has potential anti-obesity effects and is a novel therapeutic functional agent with anti-adipogenic activity via reduction of lipogenesis.
Choi, Jae Young;Lim, Jong Seok;Sim, Bo Ram;Yang, Yung Hun
Journal of Life Science
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v.30
no.6
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pp.532-541
/
2020
In this study, we describe the inhibition of adipocyte differentiation by the lactic acid bacteria (LAB) fermentation product of Chrysanthemum indicum L. (CI) extract to control obesity. Preparation of LAB-fermented products was performed to overcome the cytotoxicity of CI extract. During fermentation and 3T3-L1 cell line experiment, cytotoxicity was not induced in the CI fermentation products over 1 day in culture. Fermented materials from highly proliferative cultures were selected for treatment of 3T3-L1 cells and for comparison with unfermented control groups. Cell survival and undifferentiated cell populations were decreased differentiation population in all experimental groups compared with controls, as measured using fluorescence-activated cell sorting analysis. Akt pathway activity increased upon treatment with these fermented extracts in 3T3-L1 cells. Gli2 depleted at the protein level in association with adipocyte differentiation. LAB KCTC 3115- and 3109-fermented extract treatment caused controlled Gli2 protein accumulation. Moreover, KCTC 3115 and 3109 were found to reduce C/EBPα and FAS was depleted, whereas pACC was increased at the protein level upon treatment with the fermentation products of each of the four LAB used in this study. With Lactococcus lactis subsp. lactis KCTC 3115 fermentation, the regulation of adipose differentiation and hedgehog signaling were also suppressed, thereby inhibiting the differentiation of progenitor cells. The basis for the activation of hedgehog signaling may provide insights into the treatment of obesity and the inhibition of adipocyte differentiation.
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