• Journal of Nutrition and Health
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• v.35 no.10
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• pp.1023-1030
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• 2002

This study was conducted to examine the effects of dietary xylooligosaccharides on lipoprotein lipase (LPL) activitiy in epididymal adipose tissue and lipid composition in serum of rats fed normal or high fat diet. Male Sprague-Dawley male rats weighing 100 $\pm$ 10 g were randomly divided into four groups, two normal diets and two high fat diets containing 1% cholesterol and 10% lard. Two normal diets were classified into a basal diet (normal group) and that with 10% xylooligosaccharide diet (NX group). The high fat diet groups were classified into a HF group without xylooligosaccharides diet and HFX group supplemented with 10% xylooligosacchride diet. Experimental diets were fed ad libitum to the rats for 4 weeks and then they were sacrificed. Body weight, epididymal weight and abdominal weight in HF group were hevier than the those of normal group, but HFX group was significantly reduced compared to HF group. Relative body weight to epididymal weight and relative body weight to abdominal weight in HF group were increased to 50%, 51%, respectively, compared to normal group, but HFX group was reduced 22%, 16%, respectively, compared to HF group. The levels of serum triglyceride, total cholesterol, LDL-cholesterol and atherogenic index in HFX groups were significantly lower than those of HF group, whereas HDL-cholesterol levels were significant increased. Triglyceride contents of epididymal adipose tissue in HF group was increased to 39%, compared to normal group, but HFX group was reduced to 15.8%, compared to HF group. Cholesterol contents of epididymal adipose tissue in HF group was increased 121%, compared to normal group, but HFX group was reduced to 26%, compared to HF group. The activity of LPL in epididymal adipose tissue was increased to 259% in HF group, compared to normal group and HFX group was reduced to 66%, compared to HF group. These result of this study suggested that improved lipid metabolism observed in rats fed xylooligosaccharides may be caused by an alteration of LPL activity in epididymal adipose tissue and lipid composition in serum.

• The Korean Journal of Physiology and Pharmacology
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• v.25 no.4
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• pp.355-363
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• 2021

Dynamic changes in adipose tissue blood flow (ATBF) with nutritional status play a role in the regulation of metabolic and endocrine functions. Activation of the sympathetic nervous system via β-adrenergic receptors (β-AR) contributes to the control of postprandial enhancement of ATBF. Herein, we sought to identify the role of each β-AR subtype in the regulation of ATBF in mice. We monitored the changes in visceral epididymal ATBF (VAT BF), induced by local infusion of dobutamine, salbutamol, and CL316,243 (a selective β1-, β2-, and β3-AR agonist, respectively) into VAT of lean CD-1 mice and global adipose triglyceride lipase (ATGL) knockout (KO) mice, using laser Doppler flowmetry. Administration of CL316,243, known to promote lipolysis in adipocytes, significantly increased VAT BF of CD-1 mice to a greater extent compared to that of the vehicle, whereas administration of dobutamine or salbutamol did not produce significant differences in VAT BF. The increase in VAT BF induced by β3-AR stimulation disappeared in ATGL KO mice as opposed to their wild-type (WT) littermates, implying a role of ATGL-mediated lipolysis in the regulation of VAT BF. Different vascular reactivities occurred despite no significant differences in vessel density and adiposity between the groups. Additionally, the expression levels of the angiogenesis-related genes were significantly higher in VAT of ATGL KO mice than in that of WT, implicating an association of ATBF responsiveness with angiogenic activity in VAT. Our findings suggest a potential role of β3-AR signaling in the regulation of VAT BF via ATGL-mediated lipolysis in mice.

• Journal of Sasang Constitutional Medicine
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• v.19 no.1
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• pp.171-185
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• 2007

1. Objectvies This experimental study was designed to investigate the effect of cheongpesagan-tang extract on the obstruction of the lipase activity and weight, plasma, UCP1, 2 mRNA in db/db mouse. Material and Methods: The body weight loss, food intake, feeding efficiency ratio, weight of the internal organs (liver, kidney, epididymal fat, brown adipose tissue), plasma glucose, triglyceride, total cholesterol, white adipose tissue, adipocyte size distribution, expression of UCP1, 2 mRNA were measured in db/db mouse administered Cheongpesagan-tang extract for 6 weeks. These were then compared with those of control groups administered the diet. 2. Results 1) Inhibitory effect against lipase activity was Kilgyung(81.7%), Nabokja (73.1%), Seungma(73.0%), Daewhang (68.4%), Kalgeun (55.3%), Kobon(34.5%), Hwanggeum(4.2%). 2) In the sample group, the body weight was significantly decrease than that of control group. 3) In the sample group, the weight of epididymal fat showed significantly decrease than that of control group. 4) In the sample group, triglyceride showed significantly decrease than that of control group. 5) In the sample group, distribution of adipose tissue showed significantly larger than that of control group. 6) In the sample group, UCP1, 2 mRNA in BAT showed significantly increase than that of control group. 3. Conclusions These results show that cheongpesagan-tang has an effect on the treatment of obesity.

• Journal of Animal Science and Technology
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• v.55 no.4
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• pp.303-314
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• 2013

Knowledge regarding lipid catabolism has been of great interest in the field of animal sciences. In the livestock industry, excess fat accretion in meat is costly to the producer and undesirable to the consumer. However, intramuscular fat (marbling) is desirable to enhance carcass and product quality. The manipulation of lipid content to meet the goals of animal production requires an understanding of the detailed mechanisms of lipid catabolism to help meticulously design nutritional, pharmacological, and physiological approaches to regulate fat accretion. The concept of a basic system of lipases and their co-regulators has been identified. The major lipases cleave triacylglycerol (TAG) stored in lipid droplets in a sequential manner. In adipose tissue, adipose triglyceride lipase (ATGL) performs the first and rate-limiting step of TAG breakdown through hydrolysis at the sn-1 position of TAG to release a non-esterified fatty acid (NEFA) and diacylglycerol (DAG). Subsequently, cleavage of DAG occurs via the rate-limiting enzyme hormone-sensitive lipase (HSL) for DAG catabolism, which is followed by monoglyceride lipase (MGL) for monoacylglycerol (MAG) hydrolysis. Recent identification of the co-activator (Comparative Gene Identification-58) and inhibitor [G(0)/G(1) Switch Gene 2] of ATGL have helped elucidate this important initial step of TAG breakdown, while also generating more questions. Additionally, the roles of these lipolysis-related enzymes in muscle, liver and skin tissue have also been found to be of great importance for the investigation of systemic lipolytic regulation.

• Journal of Korean Medicine for Obesity Research
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• v.17 no.2
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• pp.101-110
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• 2017

Objectives: In this study, the lipolytic effects of Eriobotrya folium extract (EFE) on local fat was investigated in high fat diet (HFD)-induced obesity mouse and 3T3-L1 adipocytes. Methods: C57BL/6J mice (5 weeks) were fed HFD for 6 weeks to induce obesity. EFE (20 mg/ml, $100{\mu}l$) or saline ($100{\mu}l$) as a normal control was injected into left inguinal fat pad region, 3 times per a week for last 2 weeks. After sacrifice, body weight, and histological changes of the inguinal fat pad were evaluated. The expressions of hormone-sensitive lipase (HSL) and adipose triglyceride lipase (ATGL) in inguinal fat pad were analyzed by Western blotting. Also, lipid accumulation and lipases release were determined in 3T3-L1 adipocytes by oil red o staining. Results: EFE significantly reduced the weight of inguinal fat pad and the size of adipocytes in HFD-induced obesity mice compared to control. The treatment of EFE up-regulated the expressions of HSL and ATGL in inguinal fat pads of obesity mice, as well as 3T3-L1 adipocytes. In addition, EFE inhibited the lipid accumulation in 3T3-L1 adipocytes in a dose dependent manner. Conclusions: EFE showed lipolytic effect on local fat of HFD-induced obesity mice by up-regulation of the lipases secretion. This suggests that EFE could be considered as anti-obese substance with lipolytic property on local fat.

• Food Science and Biotechnology
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• v.18 no.6
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• pp.1500-1504
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• 2009

Effects of methanol extract from turmeric (Curcuma longa L.) (CME) on underlying mechanisms of lipolysis were investigated in 3T3-L1 adipocytes. Compared to the control, lipid accumulation with 72 hr treatment of CME at the concentration $20\;{\mu}g/mL$ was significantly decreased by 19.9% as quantified by Oil red O dye. Intracellular triglyceride (TG) content was also lowered by 19.3%. To determine the mechanism for TG content reduction, glycerol release level was measured. Incubation of 3T3-L1 adipocytes with 15 and $20\;{\mu}g/mL$ of CME significantly elevated the level of free glycerol released into the cultured medium by 20.4 and 28.6%, respectively. In subsequent measurements using quantitative real-time polymerase chain reaction (PCR), mRNA levels of hormone-sensitive lipase (HSL) and adipose triglyceride lipase (ATGL) were significantly increased by 21.2 and 24.9%, respectively, at the concentration $20\;{\mu}g/mL$. Results indicated that CME stimulated lipolysis through induction of HSL and ATGL mRNA expressions, resulting in increased glycerol release.

• The Journal of Internal Korean Medicine
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• v.37 no.4
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• pp.579-590
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• 2016

Objectives: This study aimed to investigate the impact of Ephedra sinica pharmacopuncture on the weight and lipid metabolism of obese mice.Methods: Obesity was induced in male C57BL/6 mice by a 60% fat diet. The animals were divided into three groups (n=5) fed a normal diet, high-fat diet, and high-fat diet with Ephedra sinica pharmacopuncture. After 13 wk, fasting blood sugar levels were measured in each group, and oral glucose tolerance tests were conducted. After 15 wk, body weight, epididymal fat pad weight, subcutaneous fat pad weight, and serum lipid and gene expression of hormone sensitive lipase (HSL), adipose triglyceride lipase (ATGL), monoacylglycerol lipase (MGL), perilipin, and peroxisome proliferator-activated receptor (PPAR)-γ were measured in each group.Results: In the Ephedra group, body weight, fasting blood sugar, and oral glucose tolerance were significantly decreased. In addition, in the Ephedra group, the gene expression of HSL was significantly increased, whereas that of perilipin was significantly decreased.Conclusions: These results provide evidence that E. sinicapharmacopuncture affects obesity and obesity-induced metabolic syndrome, including insulin resistance and dyslipidemia, by activating lipolysis via the HSL pathway in adipose tissue.

• BMB Reports
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• v.51 no.5
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• pp.249-254
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• 2018

Natural pterocarpan Medicarpin (Med) has been shown to have various beneficial biological roles, including inhibition of osteoclastogenesis, stimulation of bone regeneration and induction of apoptosis. However, the effect of the Med on lipolysis in adipocytes has not been reported. Here, we show the effect of Med on lipolysis in different mouse adipocytes and elucidate the underlying mechanism. We observed that Med treatment promoted release of glycerol in the media. Differentiated mouse brown adipose tissue cells were treated with Med. RNA-Seq analysis was performed to elucidate the effect of med and subsequently was confirmed by qRT-PCR and western blotting analyses. Med treatment increased both protein and gene expression levels of hormone-sensitive lipase (Hsl) and adipose triglyceride lipase (Atgl), which are two critical enzymes necessary for lipolysis. Mechanistic study showed that Med activates Protein Kinase A (PKA) and phosphorylates Hsl at PKA target position at $Serine^{660}$. Silencing of PKA gene by short interfering RNA attenuated the Med-induced increase in glycerol release and Hsl phosphorylation. The results unveil that Med boosts lipolysis via a PKA-dependent pathway in adipocytes and may provide a possible avenue of further research of Med mediated reduction of body fat.

• Journal of Nutrition and Health
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• v.10 no.4
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• pp.10-18
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• 1977

Activities of lipoprotein lipase (LPL) and hormone-sensitive lipase (HSL) in adipose tissue, accumulation of carcass fat, and serum triglyceride have been determined in meal-fed (MF) and ad libitum-fed (AD) rats. At each feeding frequency, the animals received diets providing total fat as 15% or 30% of calories and polyunsaturated fatty acids (PUFA) as 2.5% or 11% of calories. The food intake of the MF rats was 75% of that consumed by the AD rats but MF rat utilized their food more efficiently, as evidenced by weight gain per 100 Kcal consumed. Meal feeding, as contrasted to ad libitum feeding, resulted in greater activities of both LPL and HSL. This suggested a higher turnover of fat in the adipose tissue of MF rats. In AD rats, body fat was significantly correlated with LPL and the ratio of LPL/HSL. Meal feeding significantly increased the ratio of LPL/HSL, indicating a greater capacity for energy storage and fat deposition in the MF rat. However, at the limited caloric intake, MF rats failed to realize this potential; there was no significant difference in percentage of body fat at the two feeding frequencies. Body fat deposition was greater in rats fed the 30% fat diet, as compared with the 15% diet, regardless of the rate of food ingestion. This was coupled with a higher ratio of LPL/HSL. The significant correlation of serum triglycerides with body fat and with the ratio of LPL/HSL in AD rats suggests that LPL activity and fat deposition may be controlled by the concentration of circulating triglycerides. Both serum triglycerides and adipose LPL activity were significantly reduced when the diet contained high levels of PUFA. The percentage of body fat was also lower in animals whose intake of PUFA was high.

• Journal of the Korean Society of Food Science and Nutrition
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• v.46 no.3
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• pp.389-393
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• 2017

This study investigated the effects of Sinetrol-XPur (polyphenolic Citrus spp. and Paullinia cupana Kunth dry extract) on lipolysis using leptin-deficient obese (ob/ob) mice. Obese mice were treated with two different doses, 100 mg/kg body weight (B.W.) and 300 mg/kg B.W. in each AIN93G supplement, for 7 weeks. Body weight gain in obese mice treated with both low and high doses of Sinetrol-XPur was reduced compared with control obese mice. Abdominal and visceral adipose tissue weight of mice were reduced in high dose supplemented groups. Epididymal adipose tissue weight was reduced in both low and high dose supplemented groups by 18.27% and 41.05%, respectively. Phosphodiesterase 3B (PDE3B) mRNA levels decreased upon Sinetrol supplementation in adipose tissue of ob/ob mice, whereas A kinase anchor protein 1 (AKAP1), adipose triglyceride lipase (ATGL), and perilipin (PLIN) mRNA levels increased. These results suggest that Sinetrol-XPur supplementation partially stimulates lipolysis through reduction of PDE3B and induction of AKAP1, ATGL, and/or PLIN gene expression, resulting in reduced body and white adipose tissue weight.