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Brown adipose oxygen consumption

Yuanting Cui, Li Li, Peng Gao, Liqun Ma, Daoyan Liu, Zhiming Zhu
OBJECTIVE: Obesity is global healthy problem. Uncoupling protein 1 (UCP1) mainly expresses on brown adipose tissue (BAT), uncouples energy substrate oxidation from mitochondrial ATP production and results in the loss of potential energy as heat. Transient receptor potential vanilloid subfamily, member 1 (TRPV1) is the heat-gated cation ion channel. The aim of this study was to investigate the in vivo role of TRPV1 and UCP1 co-action in obesity. DESIGN AND METHOD: We generated and characterized UCP1 mice lacking TRPV1 activity (TRPV1/UCP1 mice)...
September 2016: Journal of Hypertension
L Dollet, J Magré, M Joubert, C Le May, A Ayer, L Arnaud, C Pecqueur, V Blouin, B Cariou, X Prieur
Loss-of-function mutations in BSCL2 are responsible for Berardinelli-Seip congenital lipodystrophy, a rare disorder characterized by near absence of adipose tissue associated with insulin resistance. Seipin-deficient (Bscl2(-/-)) mice display an almost total loss of white adipose tissue (WAT) with residual brown adipose tissue (BAT). Previous cellular studies have shown that seipin deficiency alters white adipocyte differentiation. In this study, we aimed to decipher the consequences of seipin deficiency in BAT...
October 17, 2016: Scientific Reports
Justin Darcy, Samuel McFadden, Yimin Fang, Joshua A Huber, Chi Zhang, Liou Y Sun, Andrzej Bartke
Ames dwarf mice (Prop1(df/df)) are long-lived due to a loss of function mutation resulting in deficiency of growth hormone (GH), thyroid-stimulating hormone and prolactin. Along with a marked extension of longevity, Ames dwarf mice have improved energy metabolism as measured by an increase in their oxygen consumption (VO2) and heat production, as well as a decrease in their respiratory quotient (RQ). Along with alterations in energy metabolism, Ames dwarf mice have a lower core body temperature (Tco). Moreover, Ames dwarf mice have functionally altered epididymal white adipose tissue (eWAT) that improves, rather than impairs, their insulin sensitivity due to a shift from pro- to anti-inflammatory cytokine secretion...
October 14, 2016: Endocrinology
Jonathan C Jun, Ronald Devera, Dileep Unnikrishnan, Mi-Kyung Shin, Shannon Bevans-Fonti, Qiaoling Yao, Aman Rathore, Haris Younas, Nils Halberg, Philipp E Scherer, Vsevolod Y Polotsky
: Hypoxia-inducible factor-1α (HIF-1α) in adipose tissue is known to promote obesity. We hypothesized that HIF-1α interferes with brown fat thermogenesis, thus decreasing energy expenditure. To test this hypothesis, we compared transgenic mice constitutively expressing HIF-1α in adipose tissues (HIF-1α++) at usual temperature (22 °C), where brown fat is somewhat active, or at thermoneutrality (30 °C), where brown fat is minimally active. HIF-1α++ mice or control litter mates were separated into room temperature (22 °C) or thermoneutrality (30 °C) groups...
October 14, 2016: Journal of Molecular Medicine: Official Organ of the "Gesellschaft Deutscher Naturforscher und Ärzte"
Suriyan Ponnusamy, Quynh T Tran, Innocence Harvey, Heather S Smallwood, Thirumagal Thiyagarajan, Souvik Banerjee, Daniel L Johnson, James T Dalton, Ryan D Sullivan, Duane D Miller, Dave Bridges, Ramesh Narayanan
Most satiety-inducing obesity therapeutics, despite modest efficacy, have safety concerns that underscore the need for effective peripherally acting drugs. An attractive therapeutic approach for obesity is to optimize/maximize energy expenditure by increasing energy-utilizing thermogenic brown adipose tissue. We used in vivo and in vitro models to determine the role of estrogen receptor β (ER-β) and its ligands on adipose biology. RNA sequencing and metabolomics were used to determine the mechanism of action of ER-β and its ligands...
October 12, 2016: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
Gregory Lacraz, Volatiana Rakotoarivelo, Sebastien M Labbé, Mathieu Vernier, Christophe Noll, Marian Mayhue, Jana Stankova, Adel Schwertani, Guillaume Grenier, André Carpentier, Denis Richard, Gerardo Ferbeyre, Julie Fradette, Marek Rola-Pleszczynski, Alfredo Menendez, Marie-France Langlois, Subburaj Ilangumaran, Sheela Ramanathan
OBJECTIVE: IL-15 is an inflammatory cytokine secreted by many cell types. IL-15 is also produced during physical exercise by skeletal muscle and has been reported to reduce weight gain in mice. Contrarily, our findings on IL-15 knockout (KO) mice indicate that IL-15 promotes obesity. The aim of this study is to investigate the mechanisms underlying the pro-obesity role of IL-15 in adipose tissues. METHODS: Control and IL-15 KO mice were maintained on high fat diet (HFD) or normal control diet...
2016: PloS One
Sadat A Aziz, Luisa A Wakeling, Satomi Miwa, Goiuri Alberdi, John E Hesketh, Dianne Ford
Promoting the development of brown or beige adipose tissue may protect against obesity and related metabolic features, and potentially underlies protective effects of genistein in mice. We observed that application of genistein to 3T3-L1 adipocytes changed the lipid distribution from large droplets to a multilocular distribution, reduced mRNAs indicative of white adipocytes (ACC, Fasn, Fabp4, HSL, chemerin and resistin) and increased mRNAs that are a characteristic feature of brown/beige adipocytes (CD-137 and UCP1)...
September 27, 2016: Molecular Nutrition & Food Research
Yuanting Cui, Li Li, Peng Gao, Liqun Ma, Daoyan Liu, Zhiming Zhu
OBJECTIVE: Obesity is global healthy problem. Uncoupling protein 1 (UCP1) mainly expresses on brown adipose tissue (BAT), uncouples energy substrate oxidation from mitochondrial ATP production and results in the loss of potential energy as heat. Transient receptor potential vanilloid subfamily, member 1 (TRPV1) is the heat-gated cation ion channel. The aim of this study was to investigate the in vivo role of TRPV1 and UCP1 co-action in obesity. DESIGN AND METHOD: We generated and characterized UCP1 mice lacking TRPV1 activity (TRPV1/UCP1 mice)...
September 2016: Journal of Hypertension
Brennan K Smith, Rebecca J Ford, Eric M Desjardins, Alex E Green, Meghan C Hughes, Vanessa P Houde, Emily A Day, Katarina Marcinko, Justin D Crane, Emilio P Mottillo, Christopher G R Perry, Bruce E Kemp, Mark A Tarnopolsky, Gregory R Steinberg
Salsalate is a prodrug of salicylate that lowers blood glucose in patients with type 2 diabetes (T2D) and reduces non-alcoholic fatty liver disease (NAFLD) in animal models; however, the mechanism mediating these effects is unclear. Salicylate directly activates AMP-activated protein kinase (AMPK) via the β1 subunit but whether salsalate requires AMPK β1 to improve T2D and NAFLD has not been examined. Therefore, wild-type (WT) and AMPK β1 knockout mice (AMPK β1KO) were treated with a salsalate dose resulting in clinically relevant serum salicylate concentrations (∼1 mM)...
August 23, 2016: Diabetes
A V Kalinovich, C L Mattsson, M R Youssef, N Petrovic, M Ost, V P Skulachev, I G Shabalina
BACKGROUND: A membrane-penetrating cation, dodecyltriphenylphosphonium (C12TPP), facilitates the recycling of fatty acids in the artificial lipid membrane and mitochondria. C12TPP can dissipate mitochondrial membrane potential and may affect total energy expenditure and body weight in animals and humans. METHODS: We investigated the metabolic effects of C12TPP in isolated brown-fat mitochondria, brown adipocyte cultures and mice in vivo. Experimental approaches included the measurement of oxygen consumption, carbon dioxide production, Western blotting, magnetic resonance imaging and bomb calorimetry...
August 18, 2016: International Journal of Obesity: Journal of the International Association for the Study of Obesity
Andrew C McCourt, Lovisa Jakobsson, Sara Larsson, Cecilia Holm, Sarah Piel, Eskil Elmér, Maria Björkqvist
Huntington's disease (HD) is a fatal, autosomal dominantly inherited neurodegenerative disorder, characterised not only by progressive cognitive, motor and psychiatric impairments, but also of peripheral pathology. In both human HD and in mouse models of HD there is evidence of increased energy expenditure and weight loss, alongside altered body composition. Unlike white adipose tissue (WAT), brown adipose tissue (BAT), as well as brown-like cells within WAT, expresses the mitochondrial protein, uncoupling protein 1 (UCP1)...
2016: PloS One
Yun-Hee Lee, Sou Hyun Kim, Sang-Nam Kim, Hyun-Jung Kwon, Jeong-Dong Kim, Ji Youn Oh, Young-Suk Jung
Higher susceptibility to metabolic disease in male exemplifies the importance of sexual dimorphism in pathogenesis. We hypothesized that the higher incidence of non-alcoholic fatty liver disease in males involves sex-specific metabolic interactions between liver and adipose tissue. In the present study, we used a methionine-choline deficient (MCD) diet-induced fatty liver mouse model to investigate sex differences in the metabolic response of the liver and adipose tissue. After 2 weeks on an MCD-diet, fatty liver was induced in a sex-specific manner, affecting male mice more severely than females...
July 9, 2016: Oncotarget
X Zhang, Q-X Zhang, X Wang, L Zhang, W Qu, B Bao, C-A Liu, J Liu
BACKGROUND: Two brown-like adipocytes, including classical brown adipocytes from brown adipose tissues and beige cells from white adipose tissues, regulate thermogenesis. The developmental and functional induction of brown-like cells provides a defense against obesity and associated metabolic diseases. Our previous study suggests dietary luteolin can improve diet-induced obesity and insulin resistance in mice. Here we further elucidated the action of the natural flavonoid on energy expenditure and adaptive thermogenesis...
July 5, 2016: International Journal of Obesity: Journal of the International Association for the Study of Obesity
X B Zheng, H Y Ai, S H Yuan, H Y Cao, H Liang, J P Weng, F Xu
OBJECTIVE: To investigate the effect of silent mating type information regulation 2 homolog 1 (SIRT1) deficiency on function of brown adipose tissue (BAT) in high-fat diet (HFD)-induced obese mice. METHODS: Male SIRT1 deficient heterozygous (SIRT1(+ /-)) mice and their wild-type (WT) littermates were challenged with a HFD diet for 16 weeks to induce obesity model.Energy metabolic cages were used to measure oxygen consumption and heat production, and cold tolerance test was to evaluate the adaptive thermogenic function...
June 21, 2016: Zhonghua Yi Xue za Zhi [Chinese medical journal]
Maude Giroud, Michael Karbiener, Didier F Pisani, Rayane A Ghandour, Guillaume E Beranger, Tarja Niemi, Markku Taittonen, Pirjo Nuutila, Kirsi A Virtanen, Dominique Langin, Marcel Scheideler, Ez-Zoubir Amri
In response to cold or β3-adrenoreceptor stimulation brown adipose tissue (BAT) promotes non-shivering thermogenesis, leading to energy dissipation. BAT has long been thought to be absent or scarce in adult humans. The recent discovery of thermogenic brite/beige adipocytes has opened the way to development of novel innovative strategies to combat overweight/obesity and associated diseases. Thus it is of great interest to identify regulatory factors that govern the brite adipogenic program. Here, we carried out global microRNA (miRNA) expression profiling on human adipocytes to identify miRNAs that are regulated upon the conversion from white to brite adipocytes...
2016: Scientific Reports
Naresh C Bal, Santosh K Maurya, Sushant Singh, Xander H T Wehrens, Muthu Periasamy
Skeletal muscle has been suggested as a site of nonshivering thermogenesis (NST) besides brown adipose tissue (BAT). Studies in birds, which do not contain BAT, have demonstrated the importance of skeletal muscle-based NST. However, muscle-based NST in mammals remains poorly characterized. We recently reported that sarco/endoplasmic reticulum Ca(2+) cycling and that its regulation by SLN can be the basis for muscle NST. Because of the dominant role of BAT-mediated thermogenesis in rodents, the role of muscle-based NST is less obvious...
August 12, 2016: Journal of Biological Chemistry
Yong Hwan Han, Márcio Buffolo, Karla Maria Pires, Shaobo Pei, Philipp E Scherer, Sihem Boudina
Obesity and insulin resistance are associated with oxidative stress (OS). The causal role of adipose OS in the pathogenesis of these conditions is unknown. To address this issue, we generated mice with an adipocyte-selective deletion of manganese superoxide dismutase (MnSOD). When fed a high-fat diet (HFD), the AdSod2 knockout (KO) mice exhibited less adiposity, reduced adipocyte hypertrophy, and decreased circulating leptin. The resistance to diet-induced adiposity was the result of an increased metabolic rate and energy expenditure...
September 2016: Diabetes
Min Jeong Son, Won Kon Kim, Anna Park, Kyoung-Jin Oh, Jeong-Hoon Kim, Baek Soo Han, Il Chul Kim, Seung-Wook Chi, Sung Goo Park, Sang Chul Lee, Kwang-Hee Bae
Brown adipose tissue, which is mainly composed of brown adipocytes, plays a key role in the regulation of energy balance via dissipation of extra energy as heat, and consequently counteracts obesity and its associated-disorders. Therefore, brown adipocyte differentiation should be tightly controlled at the multiple regulation steps. Among these, the regulation at the level of post-translational modifications (PTMs) is largely unknown. Here, we investigated the changes in the expression level of the enzymes involved in protein lysine methylation during brown adipocyte differentiation by using quantitative real-time PCR (qPCR) array analysis...
April 29, 2016: Molecular and Cellular Endocrinology
Chaitanya K Gavini, William C Jones, Colleen M Novak
KEY POINTS: The ventromedial hypothalamus (VMH) and the central melanocortin system both play vital roles in regulating energy balance by modulating energy intake and utilization. Recent evidence suggests that activation of the VMH alters skeletal muscle metabolism. We show that intra-VMH melanocortin receptor activation increases energy expenditure and physical activity, switches fuel utilization to fats, and lowers work efficiency such that excess calories are dissipated by skeletal muscle as heat...
September 15, 2016: Journal of Physiology
V Barquissau, D Beuzelin, D F Pisani, G E Beranger, A Mairal, A Montagner, B Roussel, G Tavernier, M-A Marques, C Moro, H Guillou, E-Z Amri, D Langin
OBJECTIVE: Fat depots with thermogenic activity have been identified in humans. In mice, the appearance of thermogenic adipocytes within white adipose depots (so-called brown-in-white i.e., brite or beige adipocytes) protects from obesity and insulin resistance. Brite adipocytes may originate from direct conversion of white adipocytes. The purpose of this work was to characterize the metabolism of human brite adipocytes. METHODS: Human multipotent adipose-derived stem cells were differentiated into white adipocytes and then treated with peroxisome proliferator-activated receptor (PPAR)γ or PPARα agonists between day 14 and day 18...
May 2016: Molecular Metabolism
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