• Ocean and Polar Research
• /
• 제44권1호
• /
• pp.61-67
• /
• 2022

In this study, in order to evaluate the anti-obesity effect of sargassum horneri extract, the effects of the extract on lipase activity and preadipocyte differentiation in 3T3-L1 cells were investigated. S. horneri extract between 0.0 and 1.0 mg/mL showed no cytotoxicity and inhibited lipase activity by 68.1%. When S. horneri extract was utilized at levels of 0.25, 0.5, and 1.0 mg/mL in 3T3-L1 cells, preadipocytes differentiation decreased by 11.4, 19.7, and 25.6%, respectively, showing anti-obesity effects. In addition, after treatment with 1.0 mg/mL S. horneri extract, the mRNA expression levels of sterol regulatory element binding proteins-1c (SREBP-1c), peroxisome proliferator activated receptor-γ (PPAR-γ), CCAAT enhancer binding protein-α (CEBP-α), fatty acid synthase (FAS), and stearoyl-CoA desaturase1 (SCD1) in 3T3-L1 cells were significantly decreased (p < 0.05) by 65.2, 54.9, 50.0, 33.8, and 33.8% respectively. These results showed that S. horneri extract suppresses lipase activity and prophylactic preadipocyte differentiation in 3T3-L1, and thus can be used as an anti-obesity agent in functional foods and medicines.

• Journal of Veterinary Science
• /
• 제23권1호
• /
• pp.4.1-4.15
• /
• 2022

Background: Flavonoids are natural polyphenols found widely in citrus fruit and peel that possess anti-adipogenic effects. On the other hand, the detailed mechanisms for the antiadipogenic effects of flavonoids are unclear. Objectives: The present study observed the anti-adipogenic effects of five major citrus flavonoids, including hesperidin (HES), narirutin (NAR), nobiletin (NOB), sinensetin (SIN), and tangeretin (TAN), on AMP-activated protein kinase (AMPK) activation in palmitate (PA)-treated HepG2 cells. Methods: The intracellular lipid accumulation and triglyceride (TG) contents were quantified by Oil-red O staining and TG assay, respectively. The glucose uptake was assessed using 2-[N-(7-Nitrobenz-2-oxa-1,3-diazol-4-yl)amino]-2-deoxy-d-glucose (2-NBDG) assay. The levels of AMPK, acetyl-CoA carboxylase (ACC), and glycogen synthase kinase 3 beta (GSK3β) phosphorylation, and levels of sterol regulatory element-binding protein 2 (SREBP-2) and 3-hydroxy-3-methylglutaryl-CoA reductase (HMGCR) expression were analyzed by Western blot analysis. The potential interaction between the flavonoids and the γ-subunit of AMPK was investigated by molecular docking analysis. Results: The flavonoid treatment reduced both intracellular lipid accumulation and TG content in PA-treated HepG2 cells significantly. In addition, the flavonoids showed increased 2-NBDG uptake in an insulin-independent manner in PA-treated HepG2 cells. The flavonoids increased the AMPK, ACC, and GSK3β phosphorylation levels and decreased the SREBP-2 and HMGCR expression levels in PA-treated HepG2 cells. Molecular docking analysis showed that the flavonoids bind to the CBS domains in the regulatory γ-subunit of AMPK with high binding affinities and could serve as potential AMPK activators. Conclusion: The overall results suggest that the anti-adipogenic effect of flavonoids on PA-treated HepG2 cells results from the activation of AMPK by flavonoids.

• Natural Product Sciences
• /
• 제26권3호
• /
• pp.230-235
• /
• 2020

A pregnane steroid, 3α-hydroxy-pregn-7-ene-6,20-dione (1), was isolated from a Hydractinia-associated Cladosporium sphaerospermum SW67 by repetitive column chromatographic separation and high-performance liquid chromatography (HPLC) purification. The planar structure of 1 was elucidated from the analysis of the spectroscopic data (1D and 2D NMR spectra) and LC-MS data. The absolute configuration of 1 was determined by interpretation of ROESY spectrum of 1, together with the comparison of reported spectroscopic values in previous studies. To the best of our knowledge, this is the first report of the identification of the pregnane scaffold from C. sphaerospermum, a natural source. Compound 1 was evaluated for its effects on lipid metabolism and adipogenesis during adipocyte maturation and showed that compound 1 substantially inhibited lipid accumulation compared to the control. Consistently, the expression of the adipocyte marker gene (Adipsin) was reduced upon incubation with 1. Further, we evaluated the effects of 1 on lipid metabolism by measuring the transcription of lipolytic and lipogenic genes. The expression of the lipolytic gene ATGL was significantly elevated upon exposure to 1 during adipogenesis, whereas the expression of lipogenic genes FASN and SREBP1 was significantly reduced upon treatment with 1. Thus, our findings provide experimental evidence that the steroid derived from Hydractinia-associated C. sphaerospermum SW67 is a potential therapeutic agent for obesity.

• 동의생리병리학회지
• /
• 제30권6호
• /
• pp.447-451
• /
• 2016

In this study, Albizziae Cortex extracts (ACE) have potent effects on adipogenesis and on lipolysis in OP9 cells. There was no cytotoxicity while cells were treated with ACE in designated time intervals, unaffected by various concentrations. In the cells with ACE-treated, increases in fat storage were inhibited, and also confirmed by Oil red O. To understand the underlying mechanism at the molecular level, the effects of ACE were examined on the expression of the genes involved in adipogenesis by using real-time PCR. In this cell model, the mRNA level of adipogenic genes such as peroxisome-proliferator-activated receptors gamma ($PPAR{\gamma}$) and CAAAT/enhancer binding protein alpha ($C/EBP{\alpha}$) were decreased by ACE treatment, comparing with those of control group. Collectively, our data suggest that ACE may have great potential as a novel anti-obesity agent.

• Journal of Microbiology and Biotechnology
• /
• 제32권1호
• /
• pp.72-80
• /
• 2022

In this study, the survival capacity (acid and bile salt tolerance, and adhesion to gut epithelial cells) and probiotic properties (enzyme activity-inhibition and anti-inflammatory activities, inhibition of adipogenesis, and stress hormone level reduction) of Lactiplantibacillus plantarum LRCC5314, isolated from kimchi (Korean traditional fermented cabbage), were investigated. LRCC5314 exhibited very stable survival at ph 2.0 and in 0.2% bile acid with 89.9% adhesion to Caco-2 intestinal epithelial cells after treatment for 2 h. LRCC5314 also inhibited the activities of α-amylase and α-glucosidase, which are involved in elevating postprandial blood glucose levels, by approximately 72.9% and 51.2%, respectively. Treatment of lipopolysaccharide (LPS)-stimulated RAW 264.7 cells with the LRCC5314 lysate decreased the levels of the inflammatory factors nitric oxide, tumor necrosis factor (TNF-α), interleukin (IL)-1β, and interferon-γ by 88.5%, 49.3%, 97.2%, and 99.8%, respectively, relative to those of the cells treated with LPS alone. LRCC5314 also inhibited adipogenesis in differentiating preadipocytes (3T3-L1 cells), showing a 14.7% decrease in lipid droplet levels and a 74.0% decrease in triglyceride levels, as well as distinct reductions in the mRNA expression levels of adiponectin, FAS, PPAR/γ, C/EBPα, TNF-α, and IL-6. Moreover, LRCC5314 reduced the level of cortisol, a hormone with important effect on stress, by approximately 35.6% in H295R cells. L. plantarum LRCC5314 is identified as a new probiotic with excellent in vitro multifunctional properties. Subsequent in vivo studies may further demonstrate its potential as a functional food or pharmabiotic.

• 한국자원식물학회지
• /
• 제29권1호
• /
• pp.1-10
• /
• 2016

본 연구는 식방풍잎(PJT) 물추출물의 항비만 효과를 알아보기 위해 지방전구세포인 3T3-L1과 5주령된 C57BL/6 수컷 쥐를 이용하여 실험을 실시하였다. 먼저, 3T3-L1 분화실험에서는 PJT를 처리함으로써 지방세포 형성 관련 인자인 C/EBPα 와 PPARγ의 유전자를 억제하였고, 그로 인하여 지방세포의 분화 및 지방 축적을 억제하였다. 다음으로, 동물실험은 C57BL/6 수컷 쥐30마리를 1주일간 적응시킨 후 정상식이군 고지방식이군으로 나눈 뒤 2주간 사육하여 다시 고지방식이군은 고지방식이군, PJT100, PJT300, PJT500 군으로 나누어 4주간 실시하였다. 체중 및 체중증가량은 고지방식이군에서 유의적으로 증가하였으며, PJT 섭취군에서 감소하였다. 지방조직의 무게도 고지방식이군에 비하여 PJT섭취군에서 낮았다. 고지방 식이에 의한 혈청 중 지질함량, leptin 수준 증가는 PJT 섭취에 따라 낮아졌다. 반면, adiponectin 과 HDL-C 수준감소는 PJT 섭취에 따라 증가하였다. H&E staining으로 관찰한 지방세포의 크기도 PJT 섭취 시 감소하였으며 부고환 지방조직에서 관찰한 지방생성 관련 유전자인 PPARγ, SREBP-1c, FAS의 발현은 고지방식이군과 비교시 PJT 섭취군에서 억제되었다. 이상의 실험결과 PJT의 섭취는 지방전구세포 및 고지방식이로 유도된 비만모델에서 지방합성관련인자의 유전자 발현을 감소하고 혈중 adipokine의 농도를 개선시켜 체지방 축적을 억제시켰다. 이로 인해 고지방식이로 유도된 체중을 감소시키고 더불어 이상지질혈증에도 긍정적 영향을 미치는 것으로 나타났다.

• 한국식품영양과학회지
• /
• 제45권8호
• /
• pp.1107-1113
• /
• 2016

지방전구세포가 지방세포로 분화하는 과정에서 아선약 추출물의 영향을 확인하고자 분화유도제를 처리하여 3T3-L1 세포에서 아선약의 세포독성, 지방축적 억제 효과, triglyceride 억제 효능, 지방분화 관련 단백질들의 발현을 확인하였다. 아선약 추출물을 최대 $200{\mu}g/mL$ 농도까지 세포에 처리하여 세포독성을 측정한 결과 아선약 추출물은 $100{\mu}g/mL$ 이하의 농도에서는 세포에 독성을 유발하지 않는 것으로 확인되었다. Oil red-O 염색을 통해 지방축적률을 확인한 결과 아선약 추출물에 의한 농도 의존적인 지방축적의 감소 효과가 있었다. Triglyceride 생성량 역시 농도 의존적인 감소가 확인되었다. 아선약에 의한 지방분화의 감소가 어떠한 기작에 의해 조절되는지 확인하고자 관련 지표단백질인 $PPAR{\gamma}$와 SREBF-1 그리고 $C/EBP{\alpha}$의 발현량 변화를 확인해본 결과 $100{\mu}g/mL$ 농도에서 유의성 있게 감소하였다. 이상의 결과를 종합해볼 때 아선약 추출물은 지방세포의 분화억제와 분화된 지방세포의 지방축적을 저해함으로써 항비만 효과를 유도할 것으로 기대된다.

• 대한본초학회지
• /
• 제29권1호
• /
• pp.45-52
• /
• 2014

Objectives : The aim of this study was to investigate the effects water extract of fermented new korean medicinal mixture, combinations of Mori Folium, Adenophorae Radix, Phllostachyos Folium and Citri Pericarpium (F-MAPC), on adipocyte differentiation, adipogenesis and glucose uptake using undiffernentiated 3T3-L1 adipocytes and L6 myoblasts. Methods : Each herb and those mixture were respectively fermented and then extracted with water. We carried on MTT assay for check-up on cell toxicity, Oil Red O staining for determination of cell differentiation and intracelluar adipogenesis. Western blot analysis for measurement of pAMPK and pACC, $C/EBP{\alpha}$, $PPAR{\gamma}$ and Glut-4 protein expressions were performed. Results : F-MAPC showed significant inhibitory activity on adipocyte differentiation in 3T3-L1 preadipocytes without affecting cell toxicity as assessed by measuring fat accumulation, and this effect was 2 fold higher in 0.2 mg/ml F-MAPC than that of the same dose of each fermented herbal extract alone. In addition, these effects were associated with modulation of adipogenic transcription factors, such as $C/EBP{\alpha}$, $PPAR{\gamma}$, as well as stimulated phosphorylations of AMPK and ACC. Translocation of Glut-4 was significantly increased by 10.2% in L6 cells treated with 0.2 mg/ml F-MAPC compared with that of control. Conclusions : These results demonstrate that F-MAPC may be an ideal candidate for therapy of obesity and diabetes by disturbing the differentiation into adipocytes, as well as the inducement of intramuscular glucose uptake from blood.

• 한방재활의학과학회지
• /
• 제32권4호
• /
• pp.1-8
• /
• 2022

Objectives This study is to investigate the effects and mechanisms of Gastrodia elata extract (GEE) on the high-fat diet-induced obesity model. Methods C57BL/6 mice were randomly assigned into 5 groups (n=10). Control group was fed normal diet (ND). Obesity group was fed 60% high fat diet (HFD). The other three groups were fed HFD with 100, 200, 500 mg/kg GEE. After five weeks, body weight, liver and epididymal fat weight, triglyceride concentration in liver and serum, sterol regulatory element-binding protein-1 (SREBP-1), acetyl-CoA carboxylase (ACC), fatty acid synthase, peroxisome proliferator-activated receptor 𝛾 (PPAR-𝛾), CCAAT/enhancer binding protein 𝛼 (C/EBP-𝛼) expression level, insulin concentration in serum were measured. Results The GEE (100, 200, and 500 mg/kg)-treated animals exhibited substantial decreases in body mass, liver weight and epididymal white adipose tissue collate to the HFD-fed group. GEE treatment also reduced hepatic and serum triglyceride level. Furthermore, GEE treatment significantly inhibited adipogenesis in the GEE group by reducing the protein expression of SREBP-1, ACC and the messenger RNA expression of PPAR𝛾, C/EBP-𝛼, which are adipocyte differentiation-related genes. Conclusions These research outcomes recommend that GEE is possibly valuable for the prevention of HFD-induced obesity via modification of various pathways related with adipogenesis and adipocyte differentiation.

• 생명과학회지
• /
• 제21권5호
• /
• pp.720-728
• /
• 2011

본 연구에서는 3T3-L1 지방전구세포에서 생마늘 및 흑마늘 열수추출물이 insulin, dexamethasone 및 IBMX 등과 같은 분화유도인자에 의하여 유발되는 lipid droplet 및 triglyceride 생성 등과 같은 지방세포로의 분화와 함께 이러한 분화과정에 중요한 역할을 하는 adipogenic transcription factor인 PPAR${\gamma}$, C/EBP${\alpha}$ 및 C/EBP${\beta}$의 발현에 어떠한 영향을 미치는지를 조사하였다. 이를 위하여 성숙한 지방세포에서 나타나는 lipid droplet의 생성에 어떠한 영향을 미치는 지를 확인한 결과, WEABG 처리군에서 lipid droplet의 생성이 현저하게 억제되는 것으로 나타났다. Lipid droplet과 함께 성숙한 지방세포에서 나타나는 특징 중 하나로서 비만의 원인으로 작용하는 지방세포 내의 저장 지방인 triglyceride 생성 정도를 확인한 결과에서도 WEABG 처리군에서 triglyceride 억제효과가 강하게 나타났다. 또한 WERG 및 WEABG-A는 분화유도인자에 의하여 유발된 PPAR${\gamma}$, C/EBP${\alpha}$ 및 C/EBP${\beta}$의 발현 억제에는 큰 영향을 미치지 못하였지만 WEABG는 그들의 발현을 전사 및 번역 수준에서 현저하게 억제시켰다. 이는 WEABG가 adipogenic transcription factor의 발현을 효과적으로 억제함으로서 lipid droplet 및 triglyceride 생성을 억제하여 지방세포로의 분화를 막는 항비만 효능을 가질 수 있음을 의미하는 결과이다. 본 연구 결과는 흑마늘의 비만억제 가능성을 제시하는 것으로서 항비만 기전에 대한 생화학적 해석 및 이를 활용한 향후 지속적인 연구를 위한 귀중한 자료로서 그 가치가 매우 높을 것으로 생각된다.