Korean red pine (Pinus densiflora) bark extract, PineXol (PX), was investigated for its potential antioxidant and anti-inflammation effects in vitro. It was hypothesized that PX treatment ($25-150{\mu}g/ml$) would reduce the lipid synthesis in HepG2 hepatocytes as well as lipid accumulation in 3T3-L1 adipocytes. Hepatocytes' intracellular triglycerides and cholesterol were decreased in the PX $150{\mu}g/ml$ treatment group compared with the control (p < 0.05). Consequently, de novo lipogenic proteins (acetyl-CoA carboxylase 1, stearoyl-CoA desaturase 1, elongase of very long chain fatty acids 6, glycerol-3-phosphate acyltransferase 1, and sterol regulatory element-binding protein 1) were significantly decreased in hepatocytes by PX $150{\mu}g/ml$ treatment compared with the control (p < 0.05). In differentiated 3T3-L1 adipocytes, the lipid accumulation was significantly attenuated by all PX treatments (p < 0.01). Regulators of adipogenesis, including CCAAT-enhancer-binding proteins alpha, peroxisome proliferatoractivated receptor gamma, and perilipin, were decreased in PX $100{\mu}g/ml$ treatment compared with the control (p < 0.05). In conclusion, PX might have anti-obesity effects by blocking hepatic lipogenesis and by inhibiting adipogenesis in adipocytes.
Objective: Tibetan pigs, predominantly originating from the Tibetan Plateau, have been subjected to long-term natural selection in an extreme environment. To characterize the metabolic adaptations to hypoxic conditions, transcriptomic and proteomic expression patterns in the livers of Tibetan and Yorkshire pigs were compared. Methods: RNA and protein were extracted from liver tissue of Tibetan and Yorkshire pigs (n = 3, each). Differentially expressed genes and proteins were subjected to gene ontology and Kyoto encyclopedia of genes and genomes functional enrichment analyses. Results: In the RNA-Seq and isobaric tags for relative and absolute quantitation analyses, a total of 18,791 genes and 3,390 proteins were detected and compared. Of these, 273 and 257 differentially expressed genes and proteins were identified. Evidence from functional enrichment analysis showed that many genes were involved in metabolic processes. The combined transcriptomic and proteomic analyses revealed that small molecular biosynthesis, metabolic processes, and organic hydroxyl compound metabolic processes were the major processes operating differently in the two breeds. The important genes include retinol dehydrogenase 16, adenine phosphoribosyltransferase, prenylcysteine oxidase 1, sorbin and SH3 domain containing 2, ENSSSCG00000036224, perilipin 2, ladinin 1, kynurenine aminotransferase 1, and dimethylarginine dimethylaminohydrolase 1. Conclusion: The findings of this study provide novel insight into the high-altitude metabolic adaptation of Tibetan pigs.
Jeong Won Choi;Hyeok Jin Choi;Gwang Hyeon Ryu;Seung Woo Im;Jae Won Lee;Jin Boo Jeong
Proceedings of the Plant Resources Society of Korea Conference
/
2023.04a
/
pp.46-46
/
2023
It has been reported that Rosa acicularis has anti-obesity activity by inhibiting the digestive lipase activity. However, there is a lack of clear in vitro studies regarding the anti-obesity activity of Rosa acicularis. Therefore, in this study, we aimed to verify the anti-obesity activity of Rosa acicularis leaves (RAL) and elucidate its mechanism of action in 3T3-L1 preadipocytes. RAL dose-dependently inhibited the accumulation of lipid droplets and triacylglycerol. RAL had no effect on cell proliferation and survival in undifferentiated 3T3-L1 cells, but it inhibited cell proliferation in differentiating 3T3-L1 cells. RAL increased ATGL, p-HSL, and HSL, and decreased perilipin-1 in differentiating 3T3-L1 cells. In addition, RAL reduced lipid droplet accumulation and increased free glycerol content in differentiated 3T3-L1 cells. RAL increased ATGL and HSL in differentiated 3T3-L1 cells. Also, RAL increased p-AMPK, PPARγ, UCP-1, and PGC-1α in differentiating 3T3-L1 cells. AMPK inhibition by Compound C attenuated RAL-mediated increase of ATGL, HSL, PPARγ, and UCP-1 in 3T3-L1 cells. Taken together, it is thought that RAL may inhibit lipid accumulation through lipolysis and thermogenesis via the activation of AMPK in adipocytes.
Objective: On the hypothesis that grazing of cattle prompts organs to secrete or internalize circulating microRNAs (c-miRNAs) in parallel with changes in energy metabolism, we aimed to clarify biological events in adipose, skeletal muscle, and liver tissues in grazing Japanese Shorthorn (JSH) steers by a transcriptomic approach. Methods: The subcutaneous fat (SCF), biceps femoris muscle (BFM), and liver in JSH steers after three months of grazing or housing were analyzed using microarray and quantitative polymerase chain reaction (qPCR), followed by gene ontology (GO) and functional annotation analyses. Results: The results of transcriptomics indicated that SCF was highly responsive to grazing compared to BFM and liver tissues. The 'Exosome', 'Carbohydrate metabolism' and 'Lipid metabolism' were extracted as the relevant GO terms in SCF and BFM, and/or liver from the >1.5-fold-altered mRNAs in grazing steers. The qPCR analyses showed a trend of upregulated gene expression related to exosome secretion and internalization (charged multivesicular body protein 4A, vacuolar protein sorting-associated protein 4B, vesicle associated membrane protein 7, caveolin 1) in the BFM and SCF, as well as upregulation of lipolysis-associated mRNAs (carnitine palmitoyltransferase 1A, hormone-sensitive lipase, perilipin 1, adipose triglyceride lipase, fatty acid binding protein 4) and most of the microRNAs (miRNAs) in SCF. Moreover, gene expression related to fatty acid uptake and inter-organ signaling (solute carrier family 27 member 4 and angiopoietin-like 4) was upregulated in BFM, suggesting activation of SCF-BFM organ crosstalk for energy metabolism. Meanwhile, expression of plasma exosomal miR-16a, miR-19b, miR-21-5p, and miR-142-5p was reduced. According to bioinformatic analyses, the c-miRNA target genes are associated with the terms 'Endosome', 'Caveola', 'Endocytosis', 'Carbohydrate metabolism', and with pathways related to environmental information processing and the endocrine system. Conclusion: Exosome and fatty acid metabolism-related gene expression was altered in SCF of grazing cattle, which could be regulated by miRNA such as miR-142-5p. These changes occurred coordinately in both the SCF and BFM, suggesting involvement of exosome in the SCF-BFM organ crosstalk to modulate energy metabolism.
Kim, Kyoung Kon;Kang, Yun Hwan;Kim, Dae Jung;Kim, Tae Woo;Choe, Myeon
Korean Journal of Food Science and Technology
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v.46
no.5
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pp.630-635
/
2014
Pine nut oil (PNO) is well known to impart beneficial effects in overweight individuals, but the mechanisms underlying PNO-mediated weight loss remain unclear. To investigate how PNO promotes weight loss, its composition was determined by gas chromatography coupled with mass spectrometry (GC-MS). In addition, the effects of PNO on cytotoxicity, lipid accumulation, expression of lipid metabolism-related biomarkers, and leptin secretion were assessed in 3T3-L1 cells. GC-MS analyses revealed that PNO contains several components, including linoleic acid, oleic acid, palmitic acid, and stearic acid. Moreover, PNO did not have a cytotoxic effect on 3T3-L1 cells. However, it inhibited the expression of peroxisome proliferator-activated receptor (PPAR) and adipocyte protein 2 (aP2). Finally, PNO significantly increased leptin secretion in a dose-dependent manner. Taken together, these results support the notion that PNO is useful for weight management in overweight individuals.
Ciglitazone is a member of the thiazolidinedione family, and specifically binds to peroxisome proliferator-activated receptor-γ (PPARγ), thereby promoting adipocyte differentiation. We hypothesized that ciglitazone as a PPARγ ligand in the absence of an adipocyte differentiation cocktail would increase adiponectin and adipogenic gene expression in bovine satellite cells (BSC). Muscle-derived BSCs were isolated from six, 18-month-old Yanbian Yellow Cattle. The BSC were cultured for 96 h in differentiation medium containing 5 µM ciglitazone (CL), 10 µM ciglitazone (CM), or 20 µM ciglitazone (CH). Control (CON) BSC were cultured only in a differentiation medium (containing 2% horse serum). The presence of myogenin, desmin, and paired box 7 (Pax7) proteins was confirmed in the BSC by immunofluorescence staining. The CL, CM, and CH treatments produced higher concentrations of triacylglycerol and lipid droplet accumulation in myotubes than those of the CON treatment. Ciglitazone treatments significantly increased the relative expression of PPARγ, CCAAT/enhancer-binding protein alpha (C/EBPα), C/EBPβ, fatty acid synthase, stearoyl-CoA desaturase, and perilipin 2. Ciglitazone treatments increased gene expression of Pax3 and Pax7 and decreased expression of myogenic differentiation-1, myogenin, myogenic regulatory factor-5, and myogenin-4 (p < 0.01). Adiponectin concentration caused by ciglitazone treatments was significantly greater than CON (p < 0.01). RNA sequencing showed that 281 differentially expressed genes (DEGs) were found in the treatments of ciglitazone. DEGs gene ontology (GO) analysis showed that the top 10 GO enrichment significantly changed the biological processes such as protein trimerization, negative regulation of cell proliferation, adipocytes differentiation, and cellular response to external stimulus. Kyoto Encyclopedia of Genes and Genomes pathway analysis showed that DEGs were involved in the p53 signaling pathway, PPAR signaling pathway, biosynthesis of amino acids, tumor necrosis factor signaling pathway, non-alcoholic fatty liver disease, PI3K-Akt signaling pathway, and Wnt signaling pathway. These results indicate that ciglitazone acts as PPARγ agonist, effectively increases the adiponectin concentration and adipogenic gene expression, and stimulates the conversion of BSC to adipocyte-like cells in the absence of adipocyte differentiation cocktail.
Kim, Da Hye;Kim, Sang Jun;Jeong, Seung-Il;Cheon, Chun Jin;Kim, Seon-Young
Journal of Life Science
/
v.24
no.11
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pp.1224-1230
/
2014
The red radish (Raphanus sativus L.; RR) sprout is a plant of the cruciferous family. In this study, we elucidated the effect of the water extract of RR sprout (RRSE) against ${\alpha}$-amylase, ${\alpha}$-glucosidase, and pancreatic lipase enzyme activity and adipogenesis in 3T3-L1 preadipocytes. ${\alpha}$-amylase, ${\alpha}$-glucosidase, and pancreatic lipase enzyme activity was inhibited in a concentration-dependent manner by RRSE treatment. RSSE also abolished adipocyte differentiation and lipid and triglyceride accumulation without cytotoxicity in 3T3-L1 adipocytes. In addition, RRSE modulated the expression of the proteins related to adipogenic transcription factors: peroxisome proliferator-activated receptor (PPAR)${\gamma}$, sterol regulatory element-binding protein 1 (SREBP-1), and CCAT/enhancer binding protein (C/EBP)${\alpha}$. RRSE also suppressed expression of the proteins responsible for lipid synthesis, transport, and storage: adiponectin, fatty acid synthesis (FAS), perilipin, and fatty acid bind protein-4 (FABP4). This study showed that RRS treatment has the potential to inhibit obesity by controlling the expression of adipogenic transcription factors and adipogenic proteins.
Tributyltin (TBT), an endocrine disrupting chemical, has been reported to decrease testicular function by causing apoptosis in the testis, but this mechanism is not fully understood. Thus, in this study we examined whether TBT induces adipogenesis of the Leydig cells to find out the correlation between adipogenesis and apoptosis in the testis. Three week old SD male rats were orally administrated with sesame oil, 1 mg/kg of TBT, or 10 mg/kg of TBT daily for 1 week and weighed after administration. The testes obtained on day 8 were weighed and stained with BODIPY and TUNEL kit. Using total RNA extracted from the isolated Leydig cells, adipogenesis and apoptosis-related genes were analyzed by real-time PCR. The testicular weights of the rats treated with 10 mg/kg TBT were significantly decreased compared to those in the control rats treated with sesame oil. As a result of BODIPY staining, the number of Leydig cells stained with BODIPY was increased in the rats treated with 10 mg/kg TBT compared with the control rats. Similar to BODIPY staining results, the TUNEL assay showed that the apoptosis of Leydig cells was increased in TBT treated rats. The results of the gene expression analysis in the Leydig cells showed that the expression of adipogenesis-related genes (PPAR${\gamma}$, aP2, Perilipin, CD36) and apoptosis-related genes (TNFRSF1A, TNFSF10) was increased after TBT administration. The present study demonstrates that TBT induces the expression of adipogenesis-related and apoptosis-related genes in the Leydig cells leading to adipogenesis and apoptosis in the testes. These results suggest that the dysfunction of Leydig cells by TBT exposure may cause a loss in testicular function.
The pharmacological efficacy of Dipterocarpus tuberculatus Roxb. has been verified in only several fields including photoaging, inflammation, hepatotoxicity, acute gastritis and osseointegration. To identify the novel functions of Dipterocarpus tuberculatus Roxb. on anti-obesity, inhibitory effect on lipid accumulation and stimulatory effect on lipolysis were investigated in MDI (3-isobutyl-1-methyl-xanthine, dexamethasone, and insulin) stimulated 3T3-L1 adipocytes treated with methanol extracts of Dipterocarpus tuberculatus Roxb. (MED). Lipogenic targets, including lipid accumulation, level of lipogenic transcription factors, and expression of lipogenic regulators, were downregulated in MDI-stimulated 3T3-L1 adipocytes treated with MED without any significant cytotoxicity. Also, MED treatment inhibited the mRNA levels of adipogenic targets including peroxisome proliferator-activated receptor (PPAR)γ and CCAAT-enhancer binding protein (C/EBP) α, as well as lipogeic targets including adipocyte fatty acid binding protein 2 (aP2) and fatty acid synthetase (FAS) in MDI-stimulated 3T3-L1 adipocytes. A similar decrease patterns were detected in Oil red O stained lipid droplets of MED treated MDI-stimulated 3T3-L1 adipocytes. Furthermore, several lipolytic targets, such as cAMP concentration, concentration of free glycerol, expression level of lipases, including ATGL, perilipin and HSL, were upregulated in MDI-stimulated 3T3-L1 adipocytes treated with MED. These results show that MED has a novel role as a lipogenesis inhibitor and lipolysis stimulator in MDI-stimulated 3T3-L1 adipocytes.
Purpose: Several studies have proven that EGCG, the primary green tea catechin, and glucosamine-6-phosphate (PGlc) reduce triglyceride contents in 3T3-L1 adipocytes. The objective of this study is to evaluate the combination effect of EGCG and PGlc on decline of accumulated fat in differentiated 3T3-L1 adipocytes. Methods: EGCG and PGlc were administered for 6 day for differentiation of 3T3-L1 adipocytes. Cell viability was measured using the CCK assay kit. In addition, TG accumulation in culture 3T3-L1 adipocytes was investigated by Oil Red O staining. We examined the expres-sion level of several genes and proteins associated with adipogenesis and lipolysis using real-time RT-PCR and Western blot analysis. A flow cytometer Calibar was used to assess the effect of EGCG and PGluco on cell-cycle progression of differentiating 3T3-L1 cells. Results: Intracelluar lipid accumulation was significantly decreased by combination treatment with EGCG $60{\mu}M$ and PGlc $200{\mu}g/m$ compared with control and EGCG treatment alone. In addition, use of combination treatment resulted in directly decreased expression of $PPAR{\gamma}$, $C/EBP{\alpha}$, and SREBP1. In addition, it inhibited adipocyte differentiation and adipogenesis through downstream regulation of adipogenic target genes such as FAS, ACSL1, and LPL, and the inhibitory action of EGCG and PGlc was found to inhibit the mitotic clonal expansion (MCE) process as evidenced by impaired cell cycle entry into S phase and the S to G2/M phase transition of confluent cells and levels of cell cycle regulating proteins such as cyclin A and CDK2. Conclusion: Combination treatment of EGCG and PGlc inhibited adipocyte differentiation through decreased expression of genes related to adipogenesis and adipogenic and cell cycle arrest in early stage of adipocyte differentiation.
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