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https://www.readbyqxmd.com/read/28109720/ucp1-in-adipose-tissues-two-steps-to-full-browning
#1
Anastasia V Kalinovich, Jasper M A de Jong, Barbara Cannon, Jan Nedergaard
The possibility that brown adipose tissue thermogenesis can be recruited in order to combat the development of obesity has led to a high interest in the identification of "browning agents", i.e. agents that increase the amount and activity of UCP1 in brown and brite/beige adipose tissues. However, functional analysis of the browning process yields confusingly different results when the analysis is performed in one of two alternative steps. Thus, in one of the steps, using cold acclimation as a potent model browning agent, we find that if the browning process is followed in mice initially housed at 21 °C (the most common procedure), there is only weak molecular evidence for increases in UCP1 gene expression or UCP1 protein abundance in classical brown adipose tissue; however, in brite/beige adipose depots, there are large increases, apparently associating functional browning with events only in the brite/beige tissues...
January 18, 2017: Biochimie
https://www.readbyqxmd.com/read/28109166/a-novel-dual-amylin-and-calcitonin-receptor-agonist-dacra-kbp-089-induces-weight-loss-through-a-reduction-in-fat-but-not-lean-mass-while-improving-food-preference
#2
Sofie Gydesen, Sara Toftegaard Hjuler, Zenia Freving, Kim Vietz Andreassen, Nina Sonne, Lars I Hellgren, Morten Asser Karsdal, Kim Henriksen
BACKGROUND AND PURPOSE: Obesity and associated co-morbidities, such as type 2 diabetes and non-alcoholic fatty liver disease, are major health challenges - hence, development of weight loss therapies with the ability to reduce the co-morbidities is key. EXPERIMENTAL APPROACH: The effect of the dual amylin and calcitonin receptor agonist (DACRA), KBP-089, on bodyweight, glucose homeostasis, and fatty acid accumulation in liver and muscle tissue, food preference was investigated...
January 21, 2017: British Journal of Pharmacology
https://www.readbyqxmd.com/read/28108609/visualization-and-quantification-of-browning-using-a-ucp1-2a-luciferase-knock-in-mouse-model
#3
Liufeng Mao, Baoming Nie, Tao Nie, Xiaoyan Hui, Xuefei Gao, Xiaoliang Lin, Xin Liu, Yong Xu, Xiaofeng Tang, Ran Yuan, Kuai Li, Peng Li, Ke Ding, Yu Wang, Aimin Xu, Jian Fei, Weiping Han, Pentao Liu, Lise Madsen, Karsten Kristiansen, Zhiguang Zhou, Sheng Ding, Donghai Wu
Both mammals and adult humans possess classic brown adipocytes and beige adipocytes, and the amount and activity of these adipocytes are considered key factors in combating obesity and its associated metabolic diseases. Uncoupling protein 1 (Ucp1) is the functional marker of both brown and beige adipocytes. To facilitate a reliable, easy, and sensitive measurement of Ucp1 expression both in vivo and in vitro, we generated a Ucp1-2A-luciferase knock-in mouse by deleting the stop codon for the mouse Ucp1 gene and replacing it with a 2A peptide...
February 2017: Diabetes
https://www.readbyqxmd.com/read/28105114/in-utero-exposure-to-di-2-ethylhexyl-phthalate-induces-metabolic-disorder-and-increases-fat-accumulation-in-visceral-depots-of-c57bl-6j-mice-offspring
#4
Hailun Gu, Yali Liu, Wei Wang, Lifeng Ding, Weiping Teng, Li Liu
Excessive visceral fat accumulation is associated with metabolic disorders. Di-(2-ethylhexyl) phthalate (DEHP), a candidate environmental obesogen, affects lipid metabolism and adipogenesis. Perinatal exposure to DEHP may be associated with metabolic disorders of dams and offspring. The aim of the present study was to explore the effects of exposure of pregnant dams to DEHP on the metabolism and fat distribution of their offspring, and to determine the mechanisms for these effects. Pregnant C57BL/6J mice were administered DEHP via gavage (0...
December 2016: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28104743/active-brown-fat-during-18fdg-pet-ct-imaging-defines-a-patient-group-with-characteristic-traits-and-an-increased-probability-of-brown-fat-redetection
#5
Carlos Gerngroß, Johanna Schretter, Martin Klingenspor, Markus Schwaiger, Tobias Fromme
Brown adipose tissue (BAT) provides a means of non-shivering thermogenesis. In humans, active BAT can be visualized by (18)F-fluoro-desoxyglucose (FDG) uptake as detected by positron emission tomography (PET) combined with computer tomography (CT). The retrospective analysis of clinical scans is a valuable source to identify anthropometric parameters that influence BAT mass and activity and thus the potential efficacy of envisioned drugs targeting this tissue to treat metabolic disease. We analyzed 2854 FDG-PET/CT scans from 1644 patients and identified 98 scans from 81 patients with active BAT...
January 19, 2017: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/28101321/switching-away-from-pipotiazine-palmitate-a-naturalistic-study
#6
Feras Ali Mustafa
BACKGROUND: In March 2015, pipotiazine palmitate depot antipsychotic was globally withdrawn due to the shortage of its active ingredient. Thus, all patients receiving this medication had to be switched to an alternative antipsychotic drug. In this study we set to evaluate the process of switching away from pipotiazine palmitate within our clinical service, and its impact on hospitalization. METHODS: Demographic and clinical data on patients who were receiving pipotiazine palmitate in Northamptonshire at the time of its withdrawal were anonymously extracted from their electronic records and analyzed using descriptive statistics...
January 2017: Therapeutic Advances in Psychopharmacology
https://www.readbyqxmd.com/read/28100477/inability-to-replete-white-adipose-tissue-during-the-recovery-phase-of-sepsis-is-associated-with-increased-autophagy-apoptosis-and-proteasome-activity
#7
Kristen T Crowell, David I Soybel, Charles H Lang
Adipose tissue is an important energy depot and endocrine organ, and the degree of adiposity impacts the host response to infection. However, little is known regarding the mechanisms by which white adipose tissue (WAT) is lost acutely and then restored after resolution of sepsis. Therefore, signaling pathways governing protein synthesis, autophagy, apoptosis and the ubiquitin-proteasome were investigated to identify potential mechanisms mediating the acute (24 h) loss of WAT after cecal ligation and puncture (CLP) as well as the failure to replenish WAT during recovery (day 10)...
January 18, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/28099124/browning-of-white-adipose-tissue-lessons-from-experimental-models
#8
Thereza Cristina Lonzetti Bargut, Vanessa Souza-Mello, Marcia Barbosa Aguila, Carlos Alberto Mandarim-de-Lacerda
Beige or brite (brown-in-white) adipocytes are present in white adipose tissue (WAT) and have a white fat-like phenotype that when stimulated acquires a brown fat-like phenotype, leading to increased thermogenesis. This phenomenon is known as browning and is more likely to occur in subcutaneous fat depots. Browning involves the expression of many transcription factors, such as PR domain containing 16 (PRDM16) and peroxisome proliferator-activated receptor (PPAR)-γ, and of uncoupling protein (UCP)-1, which is the hallmark of thermogenesis...
January 18, 2017: Hormone Molecular Biology and Clinical Investigation
https://www.readbyqxmd.com/read/28096887/thylakoids-reduce-body-fat-and-fat-cell-size-by-binding-to-dietary-fat-making-it-less-available-for-absorption-in-high-fat-fed-mice
#9
Karin G Stenkula, Eva-Lena Stenblom, Caroline Montelius, Emil Egecioglu, Charlotte Erlanson-Albertsson
BACKGROUND: Dietary thylakoids derived from spinach have beneficial effects on body fat accumulation and blood lipids as demonstrated in humans and rodents. Important mechanisms established include delayed fat digestion in the intestine, without causing steatorrhea, and increased fatty acid oxidation in intestinal cells. The objective of our study was to elucidate if increased fecal fat excretion is an important mechanism to normalize adipose tissue metabolism during high-fat feeding in mice supplemented with thylakoids...
2017: Nutrition & Metabolism
https://www.readbyqxmd.com/read/28095800/diet-gonadal-sex-and-sex-chromosome-complement-influence-white-adipose-tissue-mirna-expression
#10
Jenny C Link, Yehudit Hasin-Brumshtein, Rita M Cantor, Xuqi Chen, Arthur P Arnold, Aldons J Lusis, Karen Reue
BACKGROUND: MicroRNAs (miRNAs) are small non-coding RNA molecules that regulate gene expression by targeting specific mRNA species for degradation or interfering with translation. Specific miRNAs are key regulators of adipogenesis, and are expressed at different levels in adipose tissue from lean and obese mice. The degree of lipid accumulation and distribution of white adipose tissue differs between males and females, and it is unknown whether sex differences in adipose tissue-specific miRNA expression may contribute to this dimorphism...
January 17, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28091879/new-medical-therapies-on-the-horizon-oral-octreotide
#11
REVIEW
Nienke R Biermasz
Somatostatin analog treatment is first line medical treatment in patients with acromegaly. This drug is currently mainly administered by monthly depot preparations of octreotide and lanreotide. With the innovative transient permeability enhancer, a technology enabling the absorption of drug molecules via transient opening of the tight junctions of the gut epithelium, it is possible to achieve therapeutic octreotide levels after oral ingestion. The present review summarized the preclinical work and the recently reported phase I and III study on oral octreotide capsules in patients with acromegaly...
January 16, 2017: Pituitary
https://www.readbyqxmd.com/read/28090302/three-dimensional-micro-computed-tomography-analysis-of-the-lung-vasculature-and-differential-adipose-proteomics-in-the-sugen-hypoxia-rat-model-of-pulmonary-arterial-hypertension
#12
Kelly J Shields, Kostas Verdelis, Michael J Passineau, Erin M Faight, Lee Zourelias, Changgong Wu, Rong Chong, Raymond L Benza
Pulmonary arterial hypertension (PAH) is a rare disease characterized by significant vascular remodeling. The obesity epidemic has produced great interest in the relationship between small visceral adipose tissue depots producing localized inflammatory conditions, which may link metabolism, innate immunity, and vascular remodeling. This study used novel micro computed tomography (microCT) three-dimensional modeling to investigate the degree of remodeling of the lung vasculature and differential proteomics to determine small visceral adipose dysfunction in rats with severe PAH...
December 2016: Pulmonary Circulation
https://www.readbyqxmd.com/read/28089705/so-as-we-worry-we-weigh-visible-burrow-system-stress-and-visceral-adiposity
#13
REVIEW
Michelle T Foster
The visible borrow system (VBS) simulates a natural rodent habitat that supports genuine stress provoking social interactions. This model allows investigation of behavioral, neural and endocrine alterations caused by chronic stress. The Sakai lab further used this model to investigate metabolic outcomes of stress in relation to dominance hierarchies formed within the VBS. Communal social conflict occurs among all VBS rats, but only the SUB rats succumb to the redistribution of lipids in the visceral cavity and consequent metabolic dysregulation, such as hyper-insulinemia...
January 12, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28089515/navigation-through-the-plasma-membrane-molecular-landscape-shapes-random-organelle-movement
#14
Alison R Dun, Gabriel J Lord, Rhodri S Wilson, Deirdre M Kavanagh, Katarzyna I Cialowicz, Shuzo Sugita, Seungmee Park, Lei Yang, Annya M Smyth, Andreas Papadopulos, Colin Rickman, Rory R Duncan
Eukaryotic plasma membrane organization theory has long been controversial, in part due to a dearth of suitably high-resolution techniques to probe molecular architecture in situ and integrate information from diverse data streams [1]. Notably, clustered patterning of membrane proteins is a commonly conserved feature across diverse protein families (reviewed in [2]), including the SNAREs [3], SM proteins [4, 5], ion channels [6, 7], and receptors (e.g., [8]). Much effort has gone into analyzing the behavior of secretory organelles [9-13], and understanding the relationship between the membrane and proximal organelles [4, 5, 12, 14] is an essential goal for cell biology as broad concepts or rules may be established...
January 9, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28089233/epicardial-adipose-tissue-and-myocardial-ischemia-assessed-by-computed-tomography-perfusion-imaging-and-invasive-fractional-flow-reserve
#15
Rahul G Muthalaly, Nitesh Nerlekar, Dennis T L Wong, James D Cameron, Sujith K Seneviratne, Brian S Ko
BACKGROUND: Epicardial adipose tissue (EAT) is a metabolically active fat depot that is associated with incident coronary artery disease (CAD) and major adverse cardiovascular events. The relationship between EAT and myocardial ischemia remains unclear. This study investigated the relationship between EAT volume and the presence of perfusion defects on myocardial computed tomographic perfusion imaging (CTP) and functional stenoses on invasive fractional flow-reserve (FFR). METHODS: Data were obtained from a previous prospective cross-sectional study in patients with suspected CAD...
December 30, 2016: Journal of Cardiovascular Computed Tomography
https://www.readbyqxmd.com/read/28088478/comparison-of-the-adjuvant-activity-of-emulsions-with-different-physicochemical-properties-on-the-antibody-response-towards-the-venom-of-west-african-carpet-viper-echis-ocellatus
#16
Juan Manuel Valverde, Karina Rodríguez, María Herrera, Álvaro Segura, Mariángela Vargas, Mauren Villalta, Mavis Montero, Jose María Gutiérrez, Guillermo León
Adjuvant emulsions are widely used to enhance the antibody response of the animals used as immunoglobulin source for producing antivenoms. Usually, the adjuvant activity of emulsions is attributed both to their ability to trigger "danger" signals from cells in which they induce death, and to form depots from which immunogens are slowly released. However, there is contradictory evidence suggesting that adjuvant activity of emulsions is independent of the dispersion type and the rate of immunogen release. In order to test how physical properties of emulsions, composed of mineral oil and water, affect their ability to enhance the antibody response towards snake venoms, we compared water-in-oil (W/O) emulsions prepared at volume ratios of 70/30, 50/50 or 30/70, a 50/50 oil-in-water (O/W) emulsion, and a water-in-oil-in-water (W/O/W) multiple emulsion...
January 11, 2017: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/28088466/teneurin-2-tenm2-deficiency-induces-ucp1-expression-in-differentiating-human-fat-cells
#17
D Tews, T Fromme, M Keuper, S M Hofmann, K M Debatin, M Klingenspor, M Wabitsch, P Fischer-Posovszky
Under certain conditions UCP1 expressing adipocytes arise in white adipose tissue depots of both mice and humans. It is still not fully understood whether these cells differentiate de novo from specific progenitor cells or if they transdifferentiate from mature white adipocytes. Performing expression pattern analysis comparing adipocyte progenitor cells from deep and subcutaneous neck adipose tissue, we recently identified teneurin-2 (TENM2) enriched in white adipocyte progenitor cells. Here we tested whether TENM2 deficiency in adipocyte progenitor cells would lead to a brown adipocyte phenotype...
January 11, 2017: Molecular and Cellular Endocrinology
https://www.readbyqxmd.com/read/28087595/is-epicardial-fat-depot-associated-with-atrial-fibrillation-a-systematic-review-and-meta-analysis
#18
Maddalena Gaeta, Francesco Bandera, Federico Tassinari, Capasso Lorenzo, Miriam Cargnelutti, Gabriele Pelissero, Alexis Elias Malavazos, Cristian Ricci
AIMS: Atrial fibrillation (AF) is the leading rhythm disorder in western countries. A direct relationship between left atrium (LA) enlargement and electromechanical remodelling has been established. A causative link between epicardial fat (EF), visceral adipose tissue deposited around the heart, and AF has been hypothesized. Several reports suggested the association between EF and the presence of AF. The aim of this study was to verify the relationship between AF and EF depot, performing a meta-analysis of observational case series studies...
January 13, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/28078080/three-cases-of-anaphylaxis-following-injection-of-a-depot-corticosteroid-with-evidence-of-ige-sensitization-to-macrogols-rather-than-the-active-steroid
#19
Nicolaj Brandt, Lene H Garvey, Ulla Bindslev-Jensen, Henrik Fomsgaard Kjaer, Carsten Bindslev-Jensen, Charlotte G Mortz
We present three cases with anaphylaxis after injection of a depot corticosteroid. First, the steroid was suspected as the elicitor, but after evaluation the excipient macrogol was found to be the elicitor. One of the patients had reactions to several unrelated drugs. Increased awareness of anaphylaxis to excipients such as macrogols is needed, especially when allergy tests for the active drug is negative and in patients with a history of repeated anaphylaxis to seemingly unrelated drugs. To establish the correct diagnosis it is important to test with the exact formulation of the culprit drug, as well as all the ingredients including excipients...
2017: Clinical and Translational Allergy
https://www.readbyqxmd.com/read/28077863/what-have-human-experimental-overfeeding-studies-taught-us-about-adipose-tissue-expansion-and-susceptibility-to-obesity-and-metabolic-complications
#20
REVIEW
D J Cuthbertson, T Steele, J P Wilding, J C G Halford, J A Harrold, M Hamer, F Karpe
Overfeeding experiments, in which we impose short-term positive energy balance, help unravel the cellular, physiological and behavioural adaptations to nutrient excess. These studies mimic longer-term mismatched energy expenditure and intake. There is considerable inter-individual heterogeneity in the magnitude of weight gain when exposed to similar relative caloric excess reflecting variable activation of compensatory adaptive mechanisms. Significantly, given similar relative weight gain, individuals may be protected from/predisposed to metabolic complications (insulin resistance, dyslipidaemia, hypertension), non-alcoholic fatty liver disease and cardiovascular disease...
January 12, 2017: International Journal of Obesity: Journal of the International Association for the Study of Obesity
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