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Brown adipose

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https://www.readbyqxmd.com/read/28631352/overexpressing-stamp2-attenuates-adipose-tissue-angiogenesis-and-insulin-resistance-in-diabetic-apoe-ldlr-mouse-via-a-ppar%C3%AE-cd36-pathway
#1
Feng Wang, Lu Han, Ran-Ran Qin, Yao-Yuan Zhang, Di Wang, Zhi-Hao Wang, Meng-Xiong Tang, Yun Zhang, Ming Zhong, Wei Zhang
The aim of this study was to investigate whether overexpression of STAMP2 improves insulin resistance by regulating angiogenesis in adipose tissues. The characteristics of diabetic mice were measured by serial metabolite and pathology tests. Samples were obtained from epididymal, subcutaneous and brown adipose tissues. Histological and morphological analysis demonstrated that STAMP2 gene overexpression reduced adipocyte size, angiogenesis in epididymal and brown adipose tissues. On aortic ring assay, microvessels sprouting from aortas were significantly inhibited after STAMP2 gene overexpression...
June 19, 2017: Journal of Cellular and Molecular Medicine
https://www.readbyqxmd.com/read/28630339/ucp1-deficiency-causes-brown-fat-respiratory-chain-depletion-and-sensitizes-mitochondria-to-calcium-overload-induced-dysfunction
#2
Lawrence Kazak, Edward T Chouchani, Irina G Stavrovskaya, Gina Z Lu, Mark P Jedrychowski, Daniel F Egan, Manju Kumari, Xingxing Kong, Brian K Erickson, John Szpyt, Evan D Rosen, Michael P Murphy, Bruce S Kristal, Steven P Gygi, Bruce M Spiegelman
Brown adipose tissue (BAT) mitochondria exhibit high oxidative capacity and abundant expression of both electron transport chain components and uncoupling protein 1 (UCP1). UCP1 dissipates the mitochondrial proton motive force (Δp) generated by the respiratory chain and increases thermogenesis. Here we find that in mice genetically lacking UCP1, cold-induced activation of metabolism triggers innate immune signaling and markers of cell death in BAT. Moreover, global proteomic analysis reveals that this cascade induced by UCP1 deletion is associated with a dramatic reduction in electron transport chain abundance...
June 19, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28629569/in-depth-analysis-of-interreader-agreement-and-accuracy-in-categorical-assessment-of-brown-adipose-tissue-in-18-fdg-pet-ct
#3
Anton S Becker, Caroline Zellweger, Khoschy Schawkat, Sanja Bogdanovic, Valerie Doan Phi van, Hannes W Nagel, Christian Wolfrum, Irene A Burger
PURPOSE: To evaluate the interreader agreement of a three-tier craniocaudal grading system for brown fat activation and investigate the accuracy of the distinction between the three grades. MATERIALS AND METHODS: After IRB approval, 340 cases were retrospectively selected from patients undergoing (18)FDG-PET/CT between 2007 and 2015 at our institution, with 85 cases in each grade and 85 controls with no active brown fat. Three readers evaluated all cases independently...
June 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28626215/genetic-variation-in-the-obesity-gene-fto-is-not-associated-with-decreased-fat-oxidation-the-neo-study
#4
L L Blauw, R Noordam, S Trompet, J F P Berbée, F R Rosendaal, D van Heemst, K W van Dijk, D O Mook-Kanamori, R de Mutsert, P C N Rensen
BACKGROUND: The FTO gene harbours the strongest common genetic variant associated with obesity. Recently, rs1421085-T to -C substitution mapped in FTO was shown to induce a developmental shift of human adipocytes from an energy-combusting beige to an energy-storing white phenotype in vitro. As browning of adipocytes selectively enhances fat oxidation (FatOx), we hypothesized that rs1421085-C in FTO is associated with deceased FatOx compared with carbohydrate oxidation (CarbOx) and an increased respiratory quotient (RQ)...
June 19, 2017: International Journal of Obesity: Journal of the International Association for the Study of Obesity
https://www.readbyqxmd.com/read/28625343/short-term-cooling-increases-serum-triglycerides-and-small-high-density-lipoprotein-levels-in-humans
#5
Geerte Hoeke, Kimberly J Nahon, Leontine E H Bakker, Sabine S C Norkauer, Donna L M Dinnes, Maaike Kockx, Laeticia Lichtenstein, Diana Drettwan, Anne Reifel-Miller, Tamer Coskun, Philipp Pagel, Fred P H T M Romijn, Christa M Cobbaert, Ingrid M Jazet, Laurent O Martinez, Leonard Kritharides, Jimmy F P Berbée, Mariëtte R Boon, Patrick C N Rensen
BACKGROUND: Cold exposure and β3-adrenergic receptor agonism, which both activate brown adipose tissue, markedly influence lipoprotein metabolism by enhancing lipoprotein lipase-mediated catabolism of triglyceride-rich lipoproteins and increasing plasma high-density lipoprotein (HDL) levels and functionality in mice. However, the effect of short-term cooling on human lipid and lipoprotein metabolism remained largely elusive. OBJECTIVE: The objective was to assess the effect of short-term cooling on the serum lipoprotein profile and HDL functionality in men...
May 3, 2017: Journal of Clinical Lipidology
https://www.readbyqxmd.com/read/28624262/dibenzazepine-loaded-nanoparticles-induce-local-browning-of-white-adipose-tissue-to-counteract-obesity
#6
Chunhui Jiang, Mario Alberto Cano-Vega, Feng Yue, Liangju Kuang, Naagarajan Narayanan, Gozde Uzunalli, Madeline P Merkel, Shihuan Kuang, Meng Deng
Inhibition of Notch signaling via systemic drug administration triggers conversion of white adipocytes into beige adipocytes (browning) and reduces adiposity. However, translation of this discovery into clinical practice is challenged by potential off-target side effects and lack of control over the location and temporal extent of beige adipocyte biogenesis. Here, we demonstrate an alternative approach to stimulate browning using nanoparticles (NPs) composed of FDA-approved poly(lactide-co-glycolide) that enable sustained local release of a Notch inhibitor (dibenzazepine, DBZ)...
June 15, 2017: Molecular Therapy: the Journal of the American Society of Gene Therapy
https://www.readbyqxmd.com/read/28620456/effects-of-physical-activity-on-the-link-between-pgc-1a-and-fndc5-in-muscle-circulating-%C3%AE-risin-and-ucp1-of-white-adipocytes-in-humans-a-systematic-review
#7
Petros C Dinas, Ian M Lahart, James A Timmons, Per-Arne Svensson, Yiannis Koutedakis, Andreas D Flouris, George S Metsios
Background: Exercise may activate a brown adipose-like phenotype in white adipose tissue. The aim of this systematic review was to identify the effects of physical activity on the link between peroxisome proliferator-activated receptor gamma coactivator 1-alpha (PGC-1a) and fibronectin type III domain-containing protein 5 (FNDC5) in muscle, circulating Irisin and uncoupling protein one (UCP1) of white adipocytes in humans. Methods: Two databases (PubMed 1966 to 08/2016 and EMBASE 1974 to 08/2016) were searched using an appropriate algorithm...
2017: F1000Research
https://www.readbyqxmd.com/read/28620356/quantifying-biochemical-alterations-in-brown-and-subcutaneous-white-adipose-tissues-of-mice-using-fourier-transform-infrared-widefield-imaging
#8
Ebrahim Aboualizadeh, Owen T Carmichael, Ping He, Diana C Albarado, Christopher D Morrison, Carol J Hirschmugl
Stimulating increased thermogenic activity in adipose tissue is an important biological target for obesity treatment, and label-free imaging techniques with the potential to quantify stimulation-associated biochemical changes to the adipose tissue are highly sought after. In this study, we used spatially resolved Fourier transform infrared (FTIR) imaging to quantify biochemical changes caused by cold exposure in the brown and subcutaneous white adipose tissues (BAT and s-WAT) of 6 week-old C57BL6 mice exposed to 30°C (N = 5), 24°C (N = 5), and 10°C (N = 5) conditions for 10 days...
2017: Frontiers in Endocrinology
https://www.readbyqxmd.com/read/28615704/the-early-metabolomic-response-of-adipose-tissue-during-acute-cold-exposure-in-mice
#9
Xiyuan Lu, Ashley Solmonson, Alessia Lodi, Sara M Nowinski, Enrique Sentandreu, Christopher L Riley, Edward M Mills, Stefano Tiziani
To maintain core body temperature in cold conditions, mammals activate a complex multi-organ metabolic response for heat production. White adipose tissue (WAT) primarily functions as an energy reservoir, while brown adipose tissue (BAT) is activated during cold exposure to generate heat from nutrients. Both BAT and WAT undergo specific metabolic changes during acute cold exposure. Here, we use an untargeted metabolomics approach to characterize the initial metabolic response to cold exposure in multiple adipose tissue depots in mice...
June 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28614774/new-insight-into-the-direct-anti-inflammatory-activity-of-a-myokine-irisin-against-proinflammatory-activation-of-adipocytes-implication-for-exercise-in-obesity
#10
A I Mazur-Bialy, J Bilski, E Pochec, T Brzozowski
A biological activity of myokine irisin, has been intensively investigated in the context of a browning process occurring in white adipose tissue, but its role as a modulator of immune response has been little studied. The aim of our study was to determine the impact of irisin (0 - 100 nM) on pro-inflammatory activation of adipocyte 3T3 L1 cell line. Irisin reduced in a concentration-dependent manner the expression and activity of major proinflammatory cytokines, e.g. tumor necrosis factor-alpha (TNF-α) and interleukin 6 (IL-6) expression and their secretion into cell medium...
April 2017: Journal of Physiology and Pharmacology: An Official Journal of the Polish Physiological Society
https://www.readbyqxmd.com/read/28614714/dectin-1-activation-exacerbates-obesity-and-insulin-resistance-in-the-absence-of-myd88
#11
Angela Castoldi, Vinicius Andrade-Oliveira, Cristhiane Favero Aguiar, Mariane Tami Amano, Jennifer Lee, Marcelli Terumi Miyagi, Marcela Teatin Latância, Tarcio Teodoro Braga, Marina Burgos da Silva, Aline Ignácio, Joanna Darck Carola Correia Lima, Flavio V Loures, José Antonio T Albuquerque, Marina Barguil Macêdo, Rafael Ribeiro Almeida, Jonas W Gaiarsa, Luis A Luévano-Martínez, Thiago Belchior, Meire Ioshie Hiyane, Gordon D Brown, Marcelo A Mori, Christian Hoffmann, Marília Seelaender, Willian T Festuccia, Pedro Manoel Moraes-Vieira, Niels Olsen Saraiva Câmara
The underlying mechanism by which MyD88 regulates the development of obesity, metainflammation, and insulin resistance (IR) remains unknown. Global deletion of MyD88 in high-fat diet (HFD)-fed mice resulted in increased weight gain, impaired glucose homeostasis, elevated Dectin-1 expression in adipose tissue (AT), and proinflammatory CD11c+ AT macrophages (ATMs). Dectin-1 KO mice were protected from diet-induced obesity (DIO) and IR and had reduced CD11c+ AT macrophages. Dectin-1 antagonist improved glucose homeostasis and decreased CD11c+ AT macrophages in chow- and HFD-fed MyD88 KO mice...
June 13, 2017: Cell Reports
https://www.readbyqxmd.com/read/28614293/histone-deacetylase-3-prepares-brown-adipose-tissue-for-acute-thermogenic-challenge
#12
Matthew J Emmett, Hee-Woong Lim, Jennifer Jager, Hannah J Richter, Marine Adlanmerini, Lindsey C Peed, Erika R Briggs, David J Steger, Tao Ma, Carrie A Sims, Joseph A Baur, Liming Pei, Kyoung-Jae Won, Patrick Seale, Zachary Gerhart-Hines, Mitchell A Lazar
Brown adipose tissue is a thermogenic organ that dissipates chemical energy as heat to protect animals against hypothermia and to counteract metabolic disease. However, the transcriptional mechanisms that determine the thermogenic capacity of brown adipose tissue before environmental cold are unknown. Here we show that histone deacetylase 3 (HDAC3) is required to activate brown adipose tissue enhancers to ensure thermogenic aptitude. Mice with brown adipose tissue-specific genetic ablation of HDAC3 become severely hypothermic and succumb to acute cold exposure...
June 14, 2017: Nature
https://www.readbyqxmd.com/read/28612196/cell-source-differentiation-functional-stimulation-and-potential-application-of-human-thermogenic-adipocytes-in-vitro
#13
REVIEW
Dinh-Toi Chu, Yang Tao, Le Hoang Son, Duc-Hau Le
Recent investigations have showed that the functional thermogenic adipocytes are present in both infants and adult humans. Accumulating evidence suggests that the coexistence of classical and inducible brown (brite) adipocytes in humans at adulthood and these adipocytes function to generate heat from energy resulting in reducing body fat and improving glucose metabolism. Human thermogenic adipocytes can be differentiated in vitro from stem cells, cell lines, or adipose stromal vascular fraction. Pre-activated human brite adipocytes in vitro can maintain their thermogenic function in normal or obese immunodeficient mice; therefore, they improve glucose homeostasis and reduce fat mass in obese animals...
June 14, 2017: Journal of Physiology and Biochemistry
https://www.readbyqxmd.com/read/28611668/selective-tissue-distribution-mediates-tissue-dependent-ppar%C3%AE-activation-and-insulin-sensitization-by-int131-a-selective-ppar%C3%AE-modulator
#14
Xinni Xie, Wei Chen, Ning Zhang, Mei Yuan, Cheng Xu, Zhibing Zheng, Hua Li, Lili Wang
The mechanisms underlying the enhancement of insulin sensitivity by selective peroxisome proliferator-activated receptor γ modulators (sPPARγMs) are still not completely known. Here, the representative sPPARγM, INT131, was used as a probe to investigate the insulin-sensitizing mechanisms of sPPARγM in the context of tissue selective compound distribution and PPARγ regulation. First, 30 mg kg(-1) INT131 was observed to produce an insulin-sensitizing effect comparable to that of 10 mg kg(-1) rosiglitazone (RSG) in both db/db and DIO mice using the oral glucose and insulin tolerance tests...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28609290/functional-imaging-of-brown-adipose-tissue-in-human
#15
REVIEW
Hamza El Hadi, Roberto Vettor, Marco Rossato
Obesity has become a major public health challenge and an increasing trend is seen in its prevalence worldwide. It is a complex disorder involving an excessive amount of body fat as a result of an energy imbalance leading to caloric overload. Since the discovery of functional brown adipose tissue (BAT) in adult humans, with energy dissipating properties, this thermogenic tissue has thus emerged as an attractive therapeutic target to combat obesity and related cardiometabolic disorders. The advancements in imaging modalities to evaluate organ-specific metabolism in humans is substantially contributing to understand the physiological role of BAT...
June 13, 2017: Hormone Molecular Biology and Clinical Investigation
https://www.readbyqxmd.com/read/28608812/quantification-of-bone-fatty-acid-metabolism-and-its-regulation-by-adipocyte-lipoprotein-lipase
#16
Alexander Bartelt, Till Koehne, Klaus Tödter, Rudolph Reimer, Brigitte Müller, Friederike Behler-Janbeck, Joerg Heeren, Ludger Scheja, Andreas Niemeier
Adipocytes are master regulators of energy homeostasis. Although the contributions of classical brown and white adipose tissue (BAT and WAT, respectively) to glucose and fatty acid metabolism are well characterized, the metabolic role of adipocytes in bone marrow remains largely unclear. Here, we quantify bone fatty acid metabolism and its contribution to systemic nutrient handling in mice. Whereas in parts of the skeleton the specific amount of nutrients taken-up from the circulation was lower than in other metabolically active tissues such as BAT or liver, the overall contribution of the skeleton as a whole organ was remarkable, placing it among the top organs involved in systemic glucose as well as fatty acid clearance...
June 13, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28606728/a-histomorphometric-study-on-the-effects-of-antiretroviral-therapy-art-combined-with-a-high-calorie-diet-hcd-on-aortic-perivascular-adipose-tissue-pvat
#17
S Nel, H Strijdom, A Genis, F Everson, R Van Wijk, S H Kotzé
Perivascular adipose tissue (PVAT), surrounding arteries is metabolically active. Obesity and antiretroviral therapy (ART) may cause pathophysiological conditions in the aortic wall and surrounding PVAT. The aim of the study was to determine the histological effects on the aortic wall, aortic PVAT adipocyte morphology and leptin staining intensity in obese rats treated with ART. Wistar rats (N=36) were divided into four groups; a lean control (C/ART-), ART control (C/ART+), high-calorie diet (HCD) untreated (HCD/ART-) and HCD and ART experimental (HCD/ART+)...
June 9, 2017: Acta Histochemica
https://www.readbyqxmd.com/read/28604703/cold-induced-conversion-of-cholesterol-to-bile-acids-in-mice-shapes-the-gut-microbiome-and-promotes-adaptive-thermogenesis
#18
Anna Worthmann, Clara John, Malte C Rühlemann, Miriam Baguhl, Femke-Anouska Heinsen, Nicola Schaltenberg, Markus Heine, Christian Schlein, Ioannis Evangelakos, Chieko Mineo, Markus Fischer, Maura Dandri, Claus Kremoser, Ludger Scheja, Andre Franke, Philip W Shaul, Joerg Heeren
Adaptive thermogenesis is an energy-demanding process that is mediated by cold-activated beige and brown adipocytes, and it entails increased uptake of carbohydrates, as well as lipoprotein-derived triglycerides and cholesterol, into these thermogenic cells. Here we report that cold exposure in mice triggers a metabolic program that orchestrates lipoprotein processing in brown adipose tissue (BAT) and hepatic conversion of cholesterol to bile acids via the alternative synthesis pathway. This process is dependent on hepatic induction of cytochrome P450, family 7, subfamily b, polypeptide 1 (CYP7B1) and results in increased plasma levels, as well as fecal excretion, of bile acids that is accompanied by distinct changes in gut microbiota and increased heat production...
June 12, 2017: Nature Medicine
https://www.readbyqxmd.com/read/28597936/the-beneficial-metabolic-effects-of-insulin-sensitizers-are-not-attenuated-by-mitochondrial-pyruvate-carrier-2-hypomorphism
#19
Patrick A Vigueira, Kyle S McCommis, Wesley T Hodges, George G Schweitzer, Serena L Cole, Lalita Oonthonpan, Eric B Taylor, William G McDonald, Rolf F Kletzien, Jerry R Colca, Brian N Finck
Rosiglitazone and pioglitazone are thiazolidinedione (TZD) compounds that have been used clinically as insulin-sensitizing drugs and are generally believed to mediate their effects via activation of the peroxisome proliferator-activated receptor γ (PPARγ). Recent work has shown that it is possible to synthesize TZD compounds with potent insulin-sensitizing effects and markedly-diminished affinity for PPARγ. Both clinically-used TZDs and investigational PPARγ-sparing TZDs, such as MSDC-0602, interact with the mitochondrial pyruvate carrier (MPC) and inhibit its activity...
June 9, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/28596551/automated-segmentation-of-human-cervical-supraclavicular-adipose-tissue-in-magnetic-resonance-images
#20
Elin Lundström, Robin Strand, Anders Forslund, Peter Bergsten, Daniel Weghuber, Håkan Ahlström, Joel Kullberg
Human brown adipose tissue (BAT), with a major site in the cervical-supraclavicular depot, is a promising anti-obesity target. This work presents an automated method for segmenting cervical-supraclavicular adipose tissue for enabling time-efficient and objective measurements in large cohort research studies of BAT. Fat fraction (FF) and R2(*) maps were reconstructed from water-fat magnetic resonance imaging (MRI) of 25 subjects. A multi-atlas approach, based on atlases from nine subjects, was chosen as automated segmentation strategy...
June 8, 2017: Scientific Reports
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