• Archives of Pharmacal Research
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• 제24권3호
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• pp.214-218
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• 2001

The mechanisms responsible for the antidiabetic activity of both the white ginseng radix (Ginseng Radix Alba, GRA) and the rootlet (Cinseng Radix Palva, GRP) were investigated. After a four week oral administration, the fasting blood glucose levels in the GRA- and GRP-treated groups were lower when compared to the control group. To elucidate the hypoglycemic mechanism(s) of the ginseng radices, glucose absorption from the small intestine, hepatic hexokinase and glucose-6-phosphatase activities, in addition to PPAR-${\gamma}$ expression in adipose tissue were examined. The results strongly suggest that GRA can improve hyperglycemia in KKAy mice, possibly by blocking intestinal glucose absorption and inhibiting hepatic glucose-6-phosphatase, and GRP through the upregulation of adipocytic PPAR-$\gamma$ protein expression as well as inhibiting intestinal glucose absorption.

• KSBB Journal
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• 제27권1호
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• pp.57-60
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• 2012

In this study, we evaluated the effects of Biochanin A on glucose uptake in C2C12 myotube. We found that Biochanin A significantly stimulated 2-[N-(7-nitrobenz-2-oxa-1,3-diazol-4-yl)amino]-2-deoxy-d-glucose (2-NBDG) uptake in a dose-dependent manner. In addition, AMPK and PPAR-gamma activities were markedly increased by Biochanin A in a dose-dependent manner. However, Akt, an insulin dependent signaling molecule, did not change by Biochanin A. These results suggest that Biochanin A stimulates glucose uptake via AMPK and PPAR-gamma pathways.

• Asian-Australasian Journal of Animal Sciences
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• 제27권1호
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• pp.10-18
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• 2014

The objective of this study was to investigate the correlation between cattle breeds and deposit of adipose tissues in different positions and the gene expressions of peroxisome proliferator-activated receptor gamma ($PPAR{\gamma}$), fatty acid synthase (FASN), and Acyl-CoA dehydrogenase (ACADM), which are associated with lipid metabolism and are valuable for understanding the physiology in fat depot and meat quality. Yanbian yellow cattle and Yan yellow cattle reared under the same conditions display different fat proportions in the carcass. To understand this difference, the expression of $PPAR{\gamma}$, FASN, and ACADM in different adipose tissues and longissimus dorsi muscle (LD) in these two breeds were analyzed using the Real-time quantitative polymerase chain reaction method (qRT-PCR). The result showed that $PPAR{\gamma}$ gene expression was significantly higher in adipose tissue than in LD in both breeds. $PPAR{\gamma}$ expression was also higher in abdominal fat, in perirenal fat than in the subcutaneous fat (p<0.05) in Yanbian yellow cattle, and was significantly higher in subcutaneous fat in Yan yellow cattle than that in Yanbian yellow cattle. On the other hand, FASN mRNA expression levels in subcutaneous fat and abdominal fat in Yan yellow cattle were significantly higher than that in Yanbian yellow cattle. Interestingly, ACADM gene shows greater fold changes in LD than in adipose tissues in Yan yellow cattle. Furthermore, the expressions of these three genes in lung, colon, kidney, liver and heart of Yanbian yellow cattle and Yan yellow cattle were also investigated. The results showed that the highest expression levels of $PPAR{\gamma}$ and FASN genes were detected in the lung in both breeds. The expression of ACADM gene in kidney and liver were higher than that in other organs in Yanbian yellow cattle, the comparison was not statistically significant in Yan yellow cattle.

• 한국식품영양과학회지
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• 제42권1호
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• pp.1-7
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• 2013

본 연구에서는 3T3-L1 전지방세포를 이용하여 발효 삼정환의 지방 분화 억제 효과를 확인하고자 하였다. 삼정환을 5가지 주요 유산균으로 각각 발효시킨 후, Oil Red O 염색법으로 지방세포 분화 억제 여부를 알아보고, 이의 기전을 알기 위해서 지방생성에 핵심적인 역할을 하는 transcription factor 및 지질 조절 효소의 유전자 발현량을 비교하여 보았다. Oil Red O 염색 분석에서는 Lactobacillus plantarum, Enterococcus faecium으로 발효한 삼정환에서 지방구 수의 감소를 확인할 수 있었다. 또한 transcription factor로 $C/EPB{\alpha}$, $PPAR{\gamma}$, UCP-2 및 콜레스테롤 조절과 관련된 효소인 HMG-CoA reductase의 4가지 유전자 발현 정도를 분석하였는데, 발효시키지 않은 삼정환의 경우 농도가 $100{\mu}L/mL$ 이상일 때 네 가지 항목에서 억제 효과를 나타냈으며, 발효시켰을 때는 유산균의 종류에 따라 효과 억제효과가 있었는데, Lactobacillus plantarum으로 발효한 삼정환이 효과가 가장 좋은 것으로 나타났다. Lactobacillus plantarum으로 발효한 삼정환은 동일 농도의 발효하지 않은 삼정환과 비교했을 때, Oil Red O 실험에서 염색된 지방구 수가 더욱 감소하였으며, $PPAR{\gamma}$, UCP-2, HMG-CoA reductase의 경우 농도가 $200{\mu}L/mL$일 때 각각 35%, 57%, 54%로 5가지 발효 삼정환 중 가장 높은 억제율을 나타내었다. 이에 지방분화 억제 효과를 가진 삼정환을 발효시키면 그 효과가 더욱 증가하는 것으로 나타났는데, 특히 Lactobacillus plantarum으로 발효한 삼정환은 $PPAR{\gamma}$, UCP-2, HMG-CoA reductase의 유전자 발현조절을 통해 지방 분화를 억제시키는 것으로 밝혀져 발효 삼정환은 항비만 혹은 항고지혈증 약물로 개발 가능성이 있는 것으로 사료된다.

• 생명과학회지
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• 제21권7호
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• pp.997-1003
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• 2011

폐경과 비만은 여러 대사증후군과 관련되어 있다. 이에 본 연구는 난소절제로 폐경을 유도한 흰쥐에게 고지방식이로 비만을 유도하여 이들 지방세포에서 발현되는 PPAR${\gamma}$, PGC-$1{\alpha}$, -$1{\beta}$, NRf-1, TFAM 유전자들의 변화를 조사하고 6주간의 규칙적인 운동을 하여 그 차이에 따른 효과를 규명하는데 목적을 두고 조사하였다. 본 실험에서 사용한 암컷흰쥐는 3그룹으로 다음과 같이 구분하였다. (1) 일반식이군(C group, n=4), (2) 고지방식이 군(H group, n=4), (3) 고지방식이와 운동군(H+EX group, n=4)으로 나누었다. 규칙적인 운동은 수영운동을 하였으며, 방법은 주 5회, 총 6주간 점진적 시간증가로 수행하였다. 그 결과, 지방조직의 무게는 H 그룹에서 유의하게 높게 (p<0.01) 나타났으나 규칙적인 운동그룹은 확실히 감소되었다. 또한 규칙적인 운동은 PPAR-${\gamma}$ (p<0.05), PGC-$1{\alpha}$ (p<0.01), -$1{\beta}$ (p<0.05), NRf-1 (p<0.01), TFAM (p<0.05)의 유전자들은 모두 유의하게 증가시켰다. 이상의 결과를 종합하면 6주간의 규칙적인 수영운동은 지방세포 내 PPAR-${\gamma}$, PGC-$1{\alpha}$, -$1{\beta}$, NRf-1, TFAM의 mRNA 발현 증가와 미토콘드리아의 수 증가에 영향을 미친 것으로 추측된다. 따라서 규칙적인 운동은 폐경기 비만으로 비대해진 피하지방을 감소시키고 지방세포 내 미토콘드리아의 생합성기능을 개선시켜 미토콘드리아 수 감소를 개선할 수 있을 것으로 생각된다.

• 한국독성학회:학술대회논문집
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• 한국독성학회 2002년도 Molecular and Cellular Response to Toxic Substances
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• pp.14-40
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• 2002

15-Deoxy- Δ$\^$12,14/-prostaglandin J$_2$ (15-deoxy-PGJ$_2$), a naturally occurring ligand activates the peroxisome proliferator-activated receptor-${\gamma}$ (PPAR-${\gamma}$). Activation of PPAR-y has been found to induce cell differentiation such as adipose cell and macrophage. Here it was investigated whether 15-deoxy-PGJ$_2$ has neuronal cell differentiation and possible underlying molecular mechanisms. Dopaminergic differentiating PC 12 cells treated with 15-deoxy-PGJ$_2$ (0.2 to 1.6 ${\mu}$M) alone showed measurable neurite extension and expression of neurofilament, markers of cell differentiation. However much greater extent of neurite extension and expression of neurofilament was observed in the presence of NGF (50 ng/$m\ell$). In parallel with its increasing effect on the neurite extension and expression of neurofilament, 15-deoxy-PGJ$_2$ enhanced NGF-induced p38 MAP kinase expression and its phosphorylation in addition to the activation of transcription factor AP-1 in a dose dependent manner. Moreover, pretreatment of SD 203580, a specific inhibitor of p38 MAP kinase inhibited the promoting effect of 15-deoxy-PGJ$_2$ (0.8 ${\mu}$M) on NGF-induced neurite extension. This inhibition correlated well with the ability of SB203580 to inhibit the enhancing effect of 15-deoxy-PGJ$_2$ on the expression of p38 MAP kinase and activation of AP-1. The promoting ability of 15-deoxy-PGJ$_2$ did not occur through PPAR-${\gamma}$, as synthetic PPAR-${\gamma}$ agonist and antagonist did not change the neurite promoting effect of 15-deoxy-PGJ$_2$. In addition, contrast to other cells (embryonic midbrain and SK-N-MC cells), PPAR-${\gamma}$ was not expressed in PC-12 cells. Other structure related prostaglandins, PGD$_2$ and PGE$_2$ acting via a cell surface G-protein-coupled receptor (GPCR) did not increase basal or NGF-induced neurite extension. Moreover, GPCR (EP and DP receptor) antagonists did not alter the promoting effect of 15-deoxy-PGJ$_2$ on neurite extension and activation of p38 MAP kinase, suggesting that the promoting effect of 15-deoxy-PGJ$_2$ may not be mediated GPCR. These data demonstrate that activation of p38 MAP kinase in conjunction with AP-1 signal pathway may be important in the promoting activity of 15-deoxy-PGJ$_2$ on the differentiation of PC12 cells.

• Asian-Australasian Journal of Animal Sciences
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• 제29권2호
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• pp.184-194
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• 2016

The peroxisome proliferator-activated receptor gamma ($PPAR{\gamma}$) gene plays an important role in the biosynthesis process controlled by a number of fatty acid transcription factors. This study investigates the relationships between 130 single-nucleotide polymorphisms (SNPs) in the $PPAR{\gamma}$ gene and the fatty acid composition of muscle fat in the commercial population of Korean native cattle. We identified 38 SNPs and verified relationships between 3 SNPs (g.1159-71208 A>G, g.42555-29812 G>A, and g.72362 G>T) and the fatty acid composition of commercial Korean native cattle (n = 513). Cattle with the AA genotype of g.1159-71208 A>G and the GG genotype of g.42555-29812 G>A and g.72362 G>T had higher levels of monounsaturated fatty acids and carcass traits (p<0.05). The results revealed that the 3 identified SNPs in the $PPAR{\gamma}$ gene affected fatty acid composition and carcass traits, suggesting that these 3 SNPs may improve the flavor and quality of beef in commercial Korean native cattle.

• KSBB Journal
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• 제31권3호
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• pp.145-150
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• 2016

Boehmeria nivea (L.) Gaud., a flowering plant, has been widely cultivated in Asian countries including Korea. It has been reported that B. nivea exhibits health beneficial effects for the prevention of inflammation, oxidative stress, and virus-related diseases. In this study, we evaluated the inhibitory effect of B. nivea on adipocyte differentiation and angiogenesis. DPPH radical scavenging activities of 70% ethanol extract of B. nivea (EBN) and water extract of B. nivea (WBN) were $90.8{\pm}1.1%$ and $20{\pm}6.9%$, respectively. EBN was also effective in the reduction of adipocyte differentiation in 3T3-L1 cells. We next examined the transcriptional activity of peroxisome proliferator-activated receptor gamma ($PPAR-{\gamma}$), a pivotal target for anti-obesity. We found that treatment with rosiglitazone induced the transactivation of $PPAR-{\gamma}$. Under the same condition, $800{\mu}g/mL$ EBN reduced the transactivation of $PPAR-{\gamma}$ in rosiglitazone-induced cells. These results demonstrate that EBN-inhibited adipocyte differentiation was accompanied by $PPAR-{\gamma}$ inhibition. The study also tested whether EBN exhibits an anti-angiogenic effect by inhibiting tube formation in HUVECs. We found that EBN effectively inhibits tube formation, suggesting that EBN exhibited an anti-angiogenic effect. Taken together, B. nivea can be used as a functional food for the prevention of obesity and angiogenesis-related diseases including cancer.

• 약학회지
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• 제53권4호
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• pp.184-188
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• 2009

Fluorouracil (5-FU) is one of the most widely used chemotherapeutic drugs in the treatment of advanced colorectal cancer patients. Capsaicin (N-vanillyl-8-methyl-alpha-nonenamide), a spicy component of hot pepper, is a homovanillic acid derivative that preferentially induces cancer cells to undergo apoptosis. The purpose of the present study is to examine whether capsaicin enhances the anticancer effect of 5-fluorouracil in HT-29 human colon cancer cells by inducing apoptosis, and whether PPARgamma is involved in the capsaicin action in combination treatment with 5-FU. Treatment of the cells with either 5-FU or capsaicin alone for 48 h had little effect on the cell viability up to $50{\mu}M$ concentration, whereas co-treatment of the cells with capsaicin in the presence of 5-FU for 48 h significantly decreased the cell viability in a concentration-dependent manner. In addition, caspase-3 activity, a marker enzyme for apoptosis, was significantly increased by the combined treatment with 5-FU and capsaicin compared to the 5-FU or capsaicin alone treatment. Also, treatment with troglitazone, a peroxisome proliferator-activated receptor gamma ($PPAR{\gamma}$) agonist, further enhanced the effect of the combination treatment on the cell viability and caspase-3 activity, and bisphenol A diglycidyl ether (BADGE), a $PPAR{\gamma}$ antagonist, blocked the effect of the combination treatment. These results suggest that the combination treatment of HT-29 cells with 5-FU and capsaicin induces apoptotic cell death at relatively low concentration than each drug alone, and the combination treatment may be associated with the $PPAR{\gamma}$ pathway activation.

• Food Science and Biotechnology
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• 제16권2호
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• pp.212-217
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• 2007

Fucoidan (fucan sulfate) is a fucose-containing sulfated polysaccharide from brown algae such as Fucus vesiculosus, Ecklonia kurome, and Cladosiphon okamuranus. The aim of this study was to investigate the effect of fucoidan on the expression of diabetes-related genes in mouse cell line 3T3-L1. 3T3-L1 adipocytes were cultured for 48 hr with or without fucoidan (10, 100, and 500 ppm) on a 60 mm dish. Reverse transcription polymerase chain reaction (RT-PCR) was used for measurement of peroxisome proliferators activated receptor ${\gamma}\;(PPAR{\gamma})$, CCAAT/enhancer binding protein ${\alpha}\;(C/EBP{\gamma})$, and glucose transporter 4 (GLUT4) RT-PCR analysis revealed that expression level of GLUT4, $PPAR{\gamma}$, and $C/EBP{\alpha}$ mRNAs increased with fucoidan treatment from 10 to 500 ppm in a dose-dependent manner. Fucoidan appears to enhance insulin sensitivity by increasing the expression level of diabetes-related genes in 3T3-L1 adipocytes. Therefore, fucoidan is potentially useful as a natural therapeutic material for hyperglycemia in type II diabetes patients.