Kim, Dong Yeol;Kim, Han Rae;Kim, Kwang Kon;Park, Jeong Woo;Lee, Byung Ju
Molecules and Cells
/
v.38
no.2
/
pp.145-150
/
2015
Continuous intra- and extracellular stresses induce disorder of $Ca^{2+}$ homeostasis and accumulation of unfolded protein in the endoplasmic reticulum (ER), which results in ER stress. Severe long-term ER stress triggers apoptosis signaling pathways, resulting in cell death. Neural epidermal growth factor-like like protein 2 (NELL2) has been reported to be important in protection of cells from cell death-inducing environments. In this study, we investigated the cytoprotective effect of NELL2 in the context of ER stress induced by thapsigargin, a strong ER stress inducer, in Cos7 cells. Overexpression of NELL2 prevented ER stress-mediated apoptosis by decreasing expression of ER stress-induced C/EBP homologous protein (CHOP) and increasing ER chaperones. In this context, expression of anti-apoptotic Bcl-xL was increased by NELL2, whereas NELL2 decreased expression of pro-apoptotic proteins, such as cleaved caspases 3 and 7. This anti-apoptotic effect of NELL2 is likely mediated by extracellular signal-regulated kinase (ERK) signaling, because its inhibitor, U0126, inhibited effects of NELL2 on the expression of anti- and pro-apoptotic proteins and on the protection from ER stress-induced cell death.
Resveratrol is a non-flavonoid polyphenol which belongs to the stilbenes group and is naturally generated in several plants in response to damage or fungal invasion. It has been shown in published studies that resveratrol has an anti-adipogenic effect. A good consensus regarding the involvement of a down-regulation of $C/EBP{\alpha}$ and $PPAR{\gamma}$ in this effect has been reached. In addition, different metabolic pathways involved in triacylglycerol metabolism in white adipose tissue have been shown to be regulated by resveratrol. Concerning lipolysis, though this compound in itself seems to be unable to cause lipolysis, it increases lipid mobilization stimulated by ${\beta}-adrenergic$ agents. The increase in brown adipose tissue thermogenesis, and accordingly the associated energy dissipation, can attribute to accounting for the body-fat reducing effect of resveratrol. Besides its effects on adipose tissue, resveratrol can also acts on other organs and tissues. Therefore, it increases mitochondrial biogenesis and accordingly fatty acid oxidation in skeletal muscle and liver. This effect can also attribute to the body-fat reducing effect of this molecule. The present review purposes to collect the evidence concerning the potential mechanisms of action which underlie the anti-obesity effects of resveratrol, acquired either in cultured cells lines and animal models.
Jeong, Hyun Young;Jin, Soojung;Nam, Soo Wan;Hyun, Sook Kyung;Kim, Sung Gu;Kim, Byung Woo;Kwon, Hyun Ju
Journal of Life Science
/
v.24
no.2
/
pp.137-147
/
2014
Cortex ulmi pumilae, the cortex of Ulmus davidiana var. japonica, has been used in traditional folk medicine for its anti-inflammatory effect. Although its various bioactivities such as anti-inflammatory, anti-microbial, and anti-cancer, have been reported, the anti-adipogenic activity of cortex ulmi pumilae remains unclarified. In the present study, we investigated the effect of cortex ulmi pumilae extract on adipocyte differentiation in 3T3-L1 preadipocytes. Treatment with cortex ulmi pumilae extract significantly reduced the formation of lipid droplets and triglyceride content in a dose-dependent manner; this is associated with an inhibition of the adipogenic transcription factors, CCAAT/enhancer binding protein ${\alpha}$ ($C/EBP{\alpha}$), $C/EBP{\beta}$, and peroxisome proliferator-activated receptor ${\gamma}$ ($PPAR{\gamma}$). In addition, cortex ulmi pumilae extract treatment during the early stage of adipogenesis showed more efficient anti-adipogenic activity than treatment during other stages of adipogenesis. Cortex ulmi pumilae extract also inhibited cell proliferation and induced G1 arrest of 3T3-L1 cells in the early stage of adipogenesis. This was associated with upregulated expression of Cdk inhibitor p21 and downregulated expression of cyclin E and phospho-Rb, indicating that cortex ulmi pumilae extract blocks mitotic clonal expansion by cell cycle regulation. Taken together, these results suggest that cortex ulmi pumilae extract possesses anti-adipogenic activity through the inhibition of adipocyte differentiation by blocking mitotic clonal expansion.
Lee, Ki Yeon;Hong, Soo Young;Kim, Tae Hee;Kim, Jai Eun;Park, A-Reum;Noh, Hee Sun;Kim, Si Chang;Park, Jong Yeol;Ahn, Mun Seob;Jeong, Won Jin;Kim, Hee Yeon
Journal of Food Hygiene and Safety
/
v.33
no.2
/
pp.131-139
/
2018
Our review begins with the maize hybrid for grain, called 'Seakso 1,' which was developed in 2008 by the Gangwon Agricultural Research and Extension Services in Korea, and subsequently registered in 2011. In this study, we aimed to investigate the lipid metabolic enzyme activity and inhibitory effect on the adipocyte differentiation, in 3T3-L1 cells of the identified Seakso 1 corn husk and cob extracts (EHCS). We investigated the pancreatic lipase inhibitory effect and anti-adipogenic effect of EHCS.The lipid accumulation and adipocyte differentiation were measured by the procedure of Oil Red O staining, Real-time PCR and the Western blot analysis. The pancreatic lipase inhibitory activity of EHCS was measured at higher levels than those of the positive control (orlistat) at 100, 500, and $1,000{\mu}g/mL$. In particular, EHCS was noted as being significantly inhibited and including a measured adipocyte differentiation and lipid accumulation, when treated during the adipocyte differentiation process in 3T3-L1 cells. Based on the Oil Red O staining, EHCS inhibited lipid accumulation at 19.19%, 33.30% at $1000{\mu}g/mL$, $2000{\mu}g/mL$, respectively. The real-time PCR and Western blot analysis showed that EHCS significantly decreased in the mRNA expression and protein level of obesity-related factors, such as peroxisome-proliferatorsactivated-receptor-${\gamma}$ ($PPAR{\gamma}$) and CCAAT enhancer-binding-proteins ${\alpha}$ ($C/EBP{\alpha}$). This study potentially suggests that the Saekso 1 corn husk and cob extracts may improve lipid metabolism and reduce lipid accumulation.
Jang, Y. S.;Yoon, D. H.;Kim, T. H.;Cheong, I. C.;Jo, J. K.
Journal of Animal Science and Technology
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v.45
no.2
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pp.169-182
/
2003
To understand the structure and regulation of bovine ADRP (Adipocyte Differentiation Related Protein) gene, we have isolated the genomic clone of bovine ADRP and determined its sequence. A genomic Southern blot analysis confirmed that ADRP gene is present as a single copy in bovine genome and the ADRP gene spans 12 kb. Bovine ADRP genomic clone, HwADRPg-1, had 8 exons and 7 introns, and all splicing sites conformed to the GT/AG rule with the exon-intron boundaries located exactly. Analysis of the upstream 649 bp of the sequence of HwADRPg-1 showed that it does not contain any canonical TATAA boxes; however Sp1 binding sites and CAAT boxes are found. The promoter contained potential binding sites for AP-1, AP-2 and several putative transcription factor binding sites. The 5'-flanking region of HwADRPg-1 contained muscle specific transcription activator Myo G and C/EBP (CCAAT/ enhancer binding protein) recognizing site. These results suppose that the Myo G transcription activator regulate the transcription of bovine ADRP gene in muscular tissue and its transcriptional activity was triggered by degree of muscular development. Our results provide the necessary analysis for other flanking sequences are needed in addition to the proximal cis elements of this promoter to confer adipocyte differentiation-dependent or growth-dependent transcriptional control.
Kang, Byung Tae;Choe, Won Kyung;Park, Dong Cheol;Kim, Jong Kuk;Park, Mora;Kim, Sung Ok;Kim, Mi Ryeo
The Korea Journal of Herbology
/
v.29
no.2
/
pp.15-21
/
2014
Objectives : The purpose of this study was to investigate inhibitory effects of steamed Polygonatum odoratum extract (POE) on differentiation and adipogenesis in 3T3-L1 adipocytes. Methods : Polygonatum odoratum (P. odoratum) extract was extracted with ethyl acetate. Total phenolic and flavonoid contents in POE were measured for antioxidant activity. The spectrophotometric method was used to determine the DPPH and ABTS radical scavenging activity and ferric-reducing antioxidant potential (FRAP). MTT assay was examined for cell toxicity, oil red O staining was performed for intracelluar adipogenesis in differentiated 3T3-L1 adipocytes. Western blot analysis for measurement of CCAAT/enhancer-binding protein ${\alpha}$ ($C/EBP{\alpha}$), peroxisome proliferator-activated receptor${\gamma}$ ($PPAR{\gamma}$) and AMP-activated protein kinase (AMPK) expressions were performed. Results : The results revealed that POE has antioxidant activities. Contents of total polyphenolics and flavonoids were $50.83{\pm}1.52$ GAE mg/100g dry weight of POE and $17.05{\pm}2.47$ RE mg/100g dry weight of POE, respectively. DPPH radical scavenging activity, and FRAP in 10 mg/ml concentration were $92.1{\pm}0.6%$, $244.8{\pm}9.0{\mu}M$ Fe(II) and ABTS inhibition in 5 mg/ml concentration was $84.8{\pm}4.1%$. Treatment of POE in adipocytes inhibited the differentiation and adipogenesis of 3T3-L1 adipocytes compared to those of vehicle control. Additionally, protein expressions of $C/EBP{\alpha}$ and $PPAR{\gamma}$, major transcription factor for the adipogenic genes, were significantly decreased compared to those of vehicle control (p<0.05). Futhermore, phosphorylation of AMPK was increased in 3T3-L1 adipocytes treated with POE compared to that of vehicle control (p<0.05). Conclusions : we demonstrate that steamed P. odoratum extract (POE) has potentiating antioxidant activities, inhibits differentiation and lipid accumulation and also induces energy expenditure in adipocytes, which may contribute to antiobesity property.
Lee, Jeongkun;Lee, Yeong Hun;Park, Chae Lim;Kim, Chi Hyun
Journal of Biomedical Engineering Research
/
v.39
no.3
/
pp.109-115
/
2018
Obesity is a worldwide disease caused by the excessive proliferation of adipocytes. Multiple factors, including melatonin and physical loading, are involved in the control of obesity. Melatonin has been shown to induce apoptosis on preadipocytes while physical loading such as fluid shear stress (FSS) affects the proliferation and differentiation of adipocytes. Here, we studied the combined effects of melatonin and FSS on 3T3-L1 preadipocytes. For physical loading, preadipocytes were stimulated with a maximum dynamic fluid shear stress of 1 Pa at 1 Hz for 2 hours with/without melatonin. The experiment conditions were divided into four groups: (1) control, (2) 1 mM melatonin treatment, (3) FSS, and (4) combined 1 mM melatonin and FSS. All groups had a fixed duration time of 2 hours. ERK, p-ERK, COX-2, $C/EBP{\beta}$, $PPAR{\gamma}$, osteopontin, Bax, caspase-3 and caspase-8 proteins were assessed by Western blot analysis. GAPDH was used as a control. Results showed that combined melatonin and FSS treatment activated the ERK/MAPK pathway but not COX-2. Furthermore, combined melatonin and FSS treatment significantly decreased $C/EBP{\beta}$ and $PPAR{\gamma}$ compared to other groups. However, caspase-3 and caspase-8 did not result in significant changes. In summary, combined melatonin and FSS appears to have the potential to inhibit adipogenesis and treat obesity.
Park, Jung Ae;Jin, Kyong-Suk;Oh, You Na;Hyun, Sook Kyung;Choi, Yung Hyun;Kwon, Hyun Ju;Kim, Byung Woo
Journal of Life Science
/
v.23
no.1
/
pp.69-78
/
2013
Vitis amurensis Rupreche, a sort of grape, grows naturally in Asian countries. It is known for important biological effects such as antioxidation, anti-inflammation, neuroprotection, and angiogenesis inhibition. Although its root is used as a traditional folk medicine in Korea, the root's biological activities are poorly studied. In the present study, the effects of V. amurensis root methanol extract (VARM) and its solvent fractions on adipocyte differentiation and adipogenesis in 3T3-L1 preadipocytes were investigated. The VARM significantly suppressed adipocyte differentiation, lipid accumulation, and the triglyceride (TG) content of 3T3-L1 preadipocytes in a dose-dependent manner, without cytotoxicity. To identify active molecules, the VARM was fractionated with a series of organic solvents including dichloromethane ($CH_2Cl_2$), ethyl acetate (EtOAc), and n-butanol (n-BuOH). All the fractions also showed inhibition of lipid accumulation in the 3T3-L1 preadipocytes. The $CH_2Cl_2$ fraction showed the most powerful anti-obesity effect through the modulation of cytidine-cytidine-adenosine-adenosinethymidine (CCAAT)/enhancer binding protein ${\alpha}$ ($C/EBP{\alpha}$), $C/EBP{\beta}$, peroxisome proliferator-activated receptor ${\gamma}$ ($PPAR{\gamma}$) gene and protein expression. Oleanolic acid was one of the main active compounds involved in the anti-obesity activity of the V. amurensis root. These results provide important new insight into the potential potent anti-adipogenic effect of the V. amurensis root and illustrate that one of the main compounds involved in this effect is oleanolic acid.
In this study we cloned and characterized a novel lipid-accumulating gene, the oxidized low-density lipoprotein receptor 1 (OLR1), which is associated with lipogenesis. We analyzed the gene structure and detected the mRNA transcriptional expression levels in pig adipose tissues at different months of age (MA) and in different economic types (lean type and obese type) using real-time fluorescence quantitative PCR. OLR1 expression profile in different tissues of pig was analyzed. Finally, we studied the correlation between OLR1 and lipid metabolism related genes including peroxisome proliferator-activated $receptor{\gamma}2$ ($PPAR{\gamma}2$), fatty acid synthetase (FAS), triacylglycerol hydrolase (TGH), CAAT/enhancer binding protein $\alpha$ ($C/EBP{\alpha}$) and sterol regulatory element binding protein-1c (SREBP-1c). Results indicated that the OLR1 gene of the pig exhibited the highest homology with the cattle (84%), and the lowest with the mouse (27%). The signal peptide located from amino acid 38 to 60 and the domain from amino acid 144 to 256 were shared by the C-type lectin family. The expression level of OLR1 in pig lung was exceedingly higher than other tested tissues (p<0.01). In pig adipose tissue, the expression level of OLR1 mRNA increased significantly with growth (p<0.01). The expression level of OLR1 mRNA in obese-type pigs was significantly higher than that of lean-type pigs of the same monthly age (p<0.05). In adipose tissue, the expression of OLR1 correlated with $PPAR{\gamma}2$, FAS and SREBP-1c, but not TGH or C/EBP${\alpha}$. In conclusion, OLR1 was highly associated with fat deposition and its transcription, as suggested by high correlations, was possibly regulated by $PPAR{\gamma}2$ and SREBP-1c.
Oh, Ah Ran;Park, Jungchan;Jeong, Ji Seon;Lee, Jin Young;Choi, Ji Won;Kim, Hara;Sim, Woo Seog
The Korean Journal of Pain
/
v.35
no.2
/
pp.224-230
/
2022
Background: An epidural blood patch (EBP) is a procedure to treat intracranial hypotension that does not respond to conservative treatment. EBPs are commonly repeated when the symptoms persist. In this study, we used a large single-center retrospective cohort and evaluated the factors associated with repeated EBPs. Methods: From January 2010 to December 2020, a total of 596 patients were treated with EBPs for intracranial hypotension. We evaluated the factors associated with repeated EBPs in the entire population, in patients with spontaneous intracranial hypotension (SIH), and in those with available myelographies. Results: In a total of 596 patients, 125 (21.1%) patients required repeated EBPs, and 96/278 (34.5%) in SIH and 29/314 (9.2%) in iatrogenic population. In patients with SIH, international normalized ratio (INR) and cerebrospinal fluid (CSF) leakage on myelographies consistently exhibited significant associations (odds ratio [OR], 1.38; 95% confidence interval [CI], 1.02-1.87; P = 0.043 and OR, 2.18; 95% CI, 1.28-3.69; P = 0.004). In patients with iatrogenic injury, INR and CSF leakage on myelogram did not show difference in repeated EBPs. Conclusions: Repeated EBPs may be more frequently required in patients with SIH. Prolonged INR and CSF leakage were associated with repeated EBPs in patient with SIH. Further studies are needed to determine factors associated with repeated EBP requirements.
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