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Adipose triglyceride lipase

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https://www.readbyqxmd.com/read/29046479/lipoprotein-lipase-reaches-the-capillary-lumen-in-chickens-despite-an-apparent-absence-of-gpihbp1
#1
Cuiwen He, Xuchen Hu, Rachel S Jung, Mikael Larsson, Yiping Tu, Sandra Duarte-Vogel, Paul Kim, Norma P Sandoval, Tara R Price, Christopher M Allan, Brian Raney, Haibo Jiang, André Bensadoun, Rosemary L Walzem, Richard I Kuo, Anne P Beigneux, Loren G Fong, Stephen G Young
In mammals, GPIHBP1 is absolutely essential for transporting lipoprotein lipase (LPL) to the lumen of capillaries, where it hydrolyzes the triglycerides in triglyceride-rich lipoproteins. In all lower vertebrate species (e.g., birds, amphibians, reptiles, fish), a gene for LPL can be found easily, but a gene for GPIHBP1 has never been found. The obvious question is whether the LPL in lower vertebrates is able to reach the capillary lumen. Using purified antibodies against chicken LPL, we showed that LPL is present on capillary endothelial cells of chicken heart and adipose tissue, colocalizing with von Willebrand factor...
October 19, 2017: JCI Insight
https://www.readbyqxmd.com/read/29046332/adipose-tissue-lpl-methylation-is-associated-with-triglyceride-concentrations-in-the-metabolic-syndrome
#2
Daniel Castellano-Castillo, Isabel Moreno-Indias, José Carlos Fernández-García, Juan Alcaide-Torres, Inmaculada Moreno-Santos, Luis Ocaña, Enrique Gluckman, Francisco Tinahones, María Isabel Queipo-Ortuño, Fernando Cardona
BACKGROUND: DNA methylation is one of the epigenetic mechanisms that regulate gene expression. DNA methylation may be modified by environmental and nutritional factors. Thus, epigenetics could potentially provide a mechanism to explain the etiology of metabolic disorders, such as metabolic syndrome (MetS). The aim of this study was to analyze the level of DNA methylation of several lipoprotein lipase (LPL)-promoter-CpG dinucleotides in a CpG island region and relate this to the gene and protein expression levels in human visceral adipose tissue (VAT) from individuals with and without MetS...
October 18, 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/29021760/saponins-and-flavonoids-from-adzuki-bean-vigna-angularis-l-ameliorate-high-fat-diet-induced-obesity-in-icr-mice
#3
Rui Liu, Yinan Zheng, Zongwei Cai, Baojun Xu
Background and purpose: As an herbal medicine, adzuki bean has been practiced since the Tang Dynasty of China to maintain health and control weight; this practice is still very popular in China nowadays. However, it is still lack of sufficient scientific basis to explain scientific principle of this popular civil practice in weight control using adzuki bean. The purpose of this study was to verify and explain the anti-obesity effects of adzuki bean through in vitro enzymatic assays, in vitro lipolysis and in vivo study of obese mice model...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28988821/cold-induced-thermogenesis-depends-on-atgl-mediated-lipolysis-in-cardiac-muscle-but-not-brown-adipose-tissue
#4
Renate Schreiber, Clemens Diwoky, Gabriele Schoiswohl, Ursula Feiler, Nuttaporn Wongsiriroj, Mahmoud Abdellatif, Dagmar Kolb, Joris Hoeks, Erin E Kershaw, Simon Sedej, Patrick Schrauwen, Guenter Haemmerle, Rudolf Zechner
Fatty acids (FAs) activate and fuel UCP1-mediated non-shivering thermogenesis (NST) in brown adipose tissue (BAT). Release of FAs from intracellular fat stores by adipose triglyceride lipase (ATGL) is considered a key step in NST. Accordingly, the severe cold intolerance of global ATGL knockout (AKO) mice has been attributed to defective BAT lipolysis. Here we show that this conclusion is incorrect. We demonstrate that although the BAT-specific loss of ATGL impairs BAT lipolysis and alters BAT morphology, it does not compromise the β3-adrenergic thermogenic response or cold-induced NST...
October 5, 2017: Cell Metabolism
https://www.readbyqxmd.com/read/28980208/calcitriol-concomitantly-enhances-insulin-sensitivity-and-alters-myocellular-lipid-partitioning-in-high-fat-treated-skeletal-muscle-cells
#5
Grace E Jefferson, David M Schnell, D Travis Thomas, Lance M Bollinger
Vitamin D reduces myocellular insulin resistance, but the effects of vitamin D on intramyocellular lipid (IMCL) partitioning are unknown. The purpose of this study was to understand how calcitriol, the active vitamin D metabolite, affects insulin sensitivity and lipid partitioning in skeletal muscle cells. C2C12 myotubes were treated with calcitriol (100 nM) or vehicle control for 96 h. Insulin-stimulated Akt phosphorylation (Thr 308) was determined by western blot. Intramyocellular triacylglycerol (IMTG), diacylglycerol (DAG), and ceramide content were measured by LC/MS...
October 4, 2017: Journal of Physiology and Biochemistry
https://www.readbyqxmd.com/read/28971098/the-nutraceutic-silybin-counteracts-excess-lipid-accumulation-and-ongoing-oxidative-stress-in-an-in-vitro-model-of-non-alcoholic-fatty-liver-disease-progression
#6
Giulia Vecchione, Elena Grasselli, Federica Cioffi, Francesca Baldini, Paulo J Oliveira, Vilma A Sardão, Katia Cortese, Antonia Lanni, Adriana Voci, Piero Portincasa, Laura Vergani
Non-alcoholic fatty liver disease (NAFLD) is a major cause of liver-related morbidity and mortality. Oxidative stress and release of pro-inflammatory cytokines, such as tumor necrosis factor α (TNFα), are major consequences of hepatic lipid overload, which can contribute to progression of NAFLD to non-alcoholic steatohepatitis (NASH). Also, mitochondria are involved in the NAFLD pathogenesis for their role in hepatic lipid metabolism. Definitive treatments for NAFLD/NASH are lacking so far. Silybin, the extract of the milk thistle seeds, has previously shown beneficial effects in NAFLD...
2017: Frontiers in Nutrition
https://www.readbyqxmd.com/read/28962527/hepatic-amiodarone-lipotoxicity-is-ameliorated-by-genetic-and-pharmacological-inhibition-of-endoplasmatic-reticulum-stress
#7
Noam Erez, Einav Hubel, Roy Avraham, Raya Cohen, Sigal Fishman, Heike Bantel, Michael Manns, Boaz Tirosh, Isabel Zvibel, Oren Shibolet
Amiodarone is a commonly used antiarrhythmic drug and can cause liver steatosis. We investigated the role of endoplasmic reticulum (ER) stress/unfolded protein response in the pathogenesis of amiodarone-induced steatosis. Amiodarone-induced liver injury was obtained by 1 intraperitoneal injection to wild-type (WT) or C/EBP homologous protein knock-out mice (Ddit3-/-). Amiodarone directly reduced intracellular ATP and Ca2+ in hepatocytes invitro, inducing ER stress and lipid accumulation. In vivo, amiodarone-driven liver damage and lipid accumulation was accompanied by activation of ER stress/unfolded protein response, as demonstrated by up-regulation of genes encoding key ER stress mediators and by phosphorylation of eIF2α...
October 1, 2017: Toxicological Sciences: An Official Journal of the Society of Toxicology
https://www.readbyqxmd.com/read/28953873/inflammasome-driven-catecholamine-catabolism-in-macrophages-blunts-lipolysis-during-ageing
#8
Christina D Camell, Jil Sander, Olga Spadaro, Aileen Lee, Kim Y Nguyen, Allison Wing, Emily L Goldberg, Yun-Hee Youm, Chester W Brown, John Elsworth, Matthew S Rodeheffer, Joachim L Schultze, Vishwa Deep Dixit
Catecholamine-induced lipolysis, the first step in the generation of energy substrates by the hydrolysis of triglycerides, declines with age. The defect in the mobilization of free fatty acids in the elderly is accompanied by increased visceral adiposity, lower exercise capacity, failure to maintain core body temperature during cold stress, and reduced ability to survive starvation. Although catecholamine signalling in adipocytes is normal in the elderly, how lipolysis is impaired in ageing remains unknown...
October 5, 2017: Nature
https://www.readbyqxmd.com/read/28946914/17%C3%AE-estradiol-lowers-triglycerides-in-adipocytes-via-estrogen-receptor-%C3%AE-and-it-may-be-attenuated-by-inflammation
#9
Fei Luo, Wen-Yu Huang, Yuan Guo, Gui-Yun Ruan, Ran Peng, Xiang-Ping Li
BACKGROUND: Estrogen was reported to protect against obesity, however the mechanism remains unclear. We aimed to investigate the impact of 17β-estradiol (17β-E2) on triglyceride metabolism in adipocytes with or without lipopolysacchride (LPS) stimulating, providing novel potential mechanism for estrogen action. METHODS: 3T3-L1 adipocytes were cultured and differentiated into mature adipocytes in vitro. The differentiated 3T3-L1 cells were divided into six groups: (i) control group, treated with 0...
September 25, 2017: Lipids in Health and Disease
https://www.readbyqxmd.com/read/28938451/antibody-mediated-targeting-of-the-fgfr1c-isoform-increases-glucose-uptake-in-white-and-brown-adipose-tissue-in-male-mice
#10
Jo E Lewis, Ricardo J Samms, Scott Cooper, Jeni C Luckett, Alan C Perkins, James D Dunbar, Dennis P Smith, Paul J Emmerson, Andrew C Adams, Francis J P Ebling, Kostas Tsintzas
The increased prevalence of obesity and its cardiometabolic implications demonstrates the imperative to identify novel therapeutic targets able to effect meaningful metabolic changes in this population. Antibody-mediated targeting of fibroblast growth factor receptor 1c isoform (FGFR1c) has been shown to ameliorate hyperglycemia and protect from diet- and genetically-induced obesity in rodents and nonhuman primates. However, it is currently unknown which tissue(s) contribute to this glucose-lowering effect...
October 1, 2017: Endocrinology
https://www.readbyqxmd.com/read/28928121/novel-pharmacological-probes-reveal-abhd5-as-a-locus-of-lipolysis-control-in-white-and-brown-adipocytes
#11
Elizabeth A Rondini, Ljiljana Mladenovic-Lucas, William R Roush, Geoff Halvorsen, Alex E Green, James G Granneman
Current knowledge regarding acute regulation of adipocyte lipolysis is largely based on receptor-mediated activation or inhibition of pathways that influence intracellular levels of cyclic AMP (cAMP), thereby affecting protein kinase A (PKA) activity. We recently identified synthetic ligands of α-β-hydrolase domain containing 5 (ABHD5) that directly activate adipose triglyceride lipase (ATGL) by dissociating ABHD5 from its inhibitory regulator, perilipin-1 (PLIN1). In the current study we used these novel ligands to determine the direct contribution of ABHD5 to various aspects of lipolysis control in white (3T3-L1) and brown adipocytes...
September 19, 2017: Journal of Pharmacology and Experimental Therapeutics
https://www.readbyqxmd.com/read/28928093/effect-of-sodium-glucose-cotransporter-2-sglt2-inhibition-on-weight-loss-is-partly-mediated-by-liver-brain-adipose-neurocircuitry
#12
Yoshikazu Sawada, Yoshihiko Izumida, Yoshinori Takeuchi, Yuichi Aita, Nobuhiro Wada, EnXu Li, Yuki Murayama, Xianying Piao, Akito Shikama, Yukari Masuda, Makiko Nishi-Tatsumi, Midori Kubota, Motohiro Sekiya, Takashi Matsuzaka, Yoshimi Nakagawa, Yoko Sugano, Hitoshi Iwasaki, Kazuto Kobayashi, Shigeru Yatoh, Hiroaki Suzuki, Hiroaki Yagyu, Yasushi Kawakami, Takashi Kadowaki, Hitoshi Shimano, Naoya Yahagi
Sodium-glucose cotransporter 2 (SGLT2) inhibitors have both anti-diabetic and anti-obesity effects. However, the precise mechanism of the anti-obesity effect remains unclear. We previously demonstrated that the glycogen depletion signal triggers lipolysis in adipose tissue via liver-brain-adipose neurocircuitry. In this study, therefore, we investigated whether the anti-obesity mechanism of SGLT2 inhibitor is mediated by this mechanism. Diet-induced obese mice were subjected to hepatic vagotomy (HVx) or sham operation and loaded with high fat diet containing 0...
November 4, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28925902/adipose-triglyceride-lipase-regulation-an-overview
#13
Ines Katrin Cerk, Lisa Wechselberger, Monika Oberer
Adipose triglyceride lipase (ATGL) is the key-enzyme for the release of fatty acids (FAs) from triacylglycerol (TG) stores during intracellular lipolysis producing FAs used for energy production. There is growing evidence that the products and intermediates from lipolytic breakdown during the FA mobilization process also have fundamental regulatory functions affecting cell signaling, gene expression, metabolism, cell growth, cell death, and lipotoxicity. Regulation of ATGL is therefore vital for maintaining a defined balance between lipid storage and mobilization...
September 18, 2017: Current Protein & Peptide Science
https://www.readbyqxmd.com/read/28918476/effects-of-stocking-density-on-lipid-deposition-and-expression-of-lipid-related-genes-in-amur-sturgeon-acipenser-schrenckii
#14
Yuanyuan Ren, Haishen Wen, Yun Li, Jifang Li, Feng He, Meng Ni
To investigate the correlation between lipid deposition variation and stocking density in Amur sturgeon (Acipenser schrenckii) and the possible physiological mechanism, fish were conducted in different stocking densities (LSD 5.5 kg/m(3), MSD 8.0 kg/m(3), and HSD 11.0 kg/m(3)) for 70 days and then the growth index, lipid content, lipase activities, and the mRNA expressions of lipid-related genes were examined. Results showed that fish subjected to higher stocking density presented lower final body weights (FBW), specific growth ratio (SGR), and gonad adipose tissue index (GAI) (P < 0...
December 2017: Fish Physiology and Biochemistry
https://www.readbyqxmd.com/read/28891024/resveratrol-supplementation-improves-lipid-and-glucose-metabolism-in-high-fat-diet-fed-blunt-snout-bream
#15
Dingdong Zhang, Yanan Yan, Hongyan Tian, Guangzhen Jiang, Xiangfei Li, Wenbin Liu
Here, we aimed to investigate whether resveratrol (RSV) can ameliorate high-fat diet (HFD)-induced metabolic disorder in fish. Blunt snout bream (Megalobrama amblycephala) with average weight 27.99 ± 0.56 g were fed a normal fat diet (NFD, 5% fat, w/w), a HFD (11% fat), or a HFD supplemented with 0.04, 0.36, or 1.08% RSV for 10 weeks. As expected, fish fed a HFD developed hepatic steatosis, as shown by elevated hepatic and plasma triglycerides, raised whole body fat, intraperitoneal fat ratio and hepatosomatic index, and increased plasma alanine aminotransferase (ALT) and aspartate aminotransferase (AST)...
September 10, 2017: Fish Physiology and Biochemistry
https://www.readbyqxmd.com/read/28873429/cd18-deficiency-improves-liver-injury-in-the-mcd-model-of-steatohepatitis
#16
Andrew A Pierce, Caroline C Duwaerts, Kevin Siao, Aras N Mattis, Amanda Goodsell, Jody L Baron, Jacquelyn J Maher
Neutrophils and macrophages are important constituents of the hepatic inflammatory infiltrate in non-alcoholic steatohepatitis. These innate immune cells express CD18, an adhesion molecule that facilitates leukocyte activation. In the context of fatty liver, activation of infiltrated leukocytes is believed to enhance hepatocellular injury. The objective of this study was to determine the degree to which activated innate immune cells promote steatohepatitis by comparing hepatic outcomes in wild-type and CD18-mutant mice fed a methionine-choline-deficient (MCD) diet...
2017: PloS One
https://www.readbyqxmd.com/read/28873005/recycling-the-danger-via-lipid-droplet-biogenesis-after-autophagy
#17
Yuan Li, Wei-Xing Zong, Wen-Xing Ding
Fatty acids are an important cellular energy source under starvation conditions. However, excessive free fatty acids (FFAs) in the cytoplasm cause lipotoxicity. Therefore, it is important to understand the mechanisms by which cells mobilize lipids and maintain a homeostatic level of fatty acids. Recent evidence suggests that cells can break down lipid droplets (LDs), the intracellular organelles that store neutral lipids, via PNPLA2/adipose triglyceride lipase and a selective type of macroautophagy/autophagy termed lipophagy, to release FFAs under starvation conditions...
September 5, 2017: Autophagy
https://www.readbyqxmd.com/read/28851734/cardiac-overexpression-of-perilipin-2-induces-dynamic-steatosis-prevention-by-hormone-sensitive-lipase
#18
Masami Ueno, Jinya Suzuki, Masamichi Hirose, Satsuki Sato, Michiko Imagawa, Yasuo Zenimaru, Sadao Takahashi, Shoichiro Ikuyama, Tsutomu Koizumi, Tadashi Konoshita, Fredric B Kraemer, Tamotsu Ishizuka
Cardiac intracellular lipid accumulation (steatosis) is a pathophysiological phenomenon observed in starvation and diabetes mellitus. Perilipin 2 (PLIN2) is a lipid droplet (LD)-associated protein expressed in non-adipose tissues, including the heart. To explore the pathophysiological function of myocardial PLIN2, we generated transgenic (Tg) mice by cardiac-specific overexpression of PLIN2. Tg hearts showed accumulation of numerous small LDs associated with mitochondrial chains, and high cardiac triacylglycerol (TAG) content (8-fold greater than wild-type (Wt) mice)...
August 29, 2017: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28843519/microrna-profiles-of-fibroblasts-derived-from-in-vivo-fertilized-and-fat-1-transgenic-cattle
#19
Yang Lv, Yu Wang, Jiajia Sun, Chunling Gong, Yan Chen, Guanghua Su, Guangqi Gao, Chunling Bai, Zhuying Wei, Lisheng Zhang, Shorgan Bou, Guangpeng Li
Fat-1 transgenic cattle have high levels of ω-3 fatty acids, which regulate several genes in fatty acid metabolism. In the current study, fibroblasts derived from in vivo fertilized (Ferti) and fat-1 transgenic (TG) Luxi cattle (Bos taurus), a local breed in China, were cultured and their miRNA expression was characterized. Expression of 352 known miRNAs differed in cells from Ferti and TG cattle: 83 miRNAs were found to be specifically expressed in cells from Ferti cattle while 23 miRNAs were found to be specifically expressed in cells from TG cattle...
December 15, 2017: Gene
https://www.readbyqxmd.com/read/28830524/lipases-and-lipid-droplet-associated-protein-expression-in-subcutaneous-white-adipose-tissue-of-cachectic-patients-with-cancer
#20
Renata Silvério, Fábio S Lira, Lila M Oyama, Cláudia M Oller do Nascimento, José P Otoch, Paulo S M Alcântara, Miguel L Batista, Marília Seelaender
BACKGROUND: Cancer cachexia is a multifactorial metabolic syndrome characterized by marked loss of adipose tissue and skeletal muscle. Fat loss from adipose tissue in cancer cachexia is partly the result of increased lipolysis. Despite the growing amount of studies focused on elucidating the mechanisms through which lipolysis-related proteins regulate the lipolytic process, there are scarce data concerning that profile in the adipose tissue of cancer cachectic patients. Considering its fundamental importance, it was our main purpose to characterize the expression of the lipolysis-related proteins in the white adipose tissue of cachectic cancer patients...
August 22, 2017: Lipids in Health and Disease
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