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https://www.readbyqxmd.com/read/29434028/effects-of-thyroid-hormones-on-thermogenesis-and-energy-partitioning
#1
Karl Alexander Iwen, Rebecca Ölkrug, Georg Brabant
Thyroid hormones (TH) are of central importance for thermogenesis, energy homeostasis, and metabolism. Here we will discuss these aspects by focussing on the physiological aspects of TH-dependent regulation in response to cold exposure and fasting which will be compared to alterations in primary hyper- and hypothyroidism. In particular, we will summarise current knowledge on regional thyroid hormone status in the central nervous system (CNS) and in peripheral cells. In contrast to hyper- and hypothyroidism, where parallel changes are observed, local alterations in the CNS differ to peripheral compartments when induced by cold exposure or fasting...
February 6, 2018: Journal of Molecular Endocrinology
https://www.readbyqxmd.com/read/29433631/ampk-signaling-to-acetyl-coa-carboxylase-is-required-for-fasting-and-cold-induced-appetite-but-not-thermogenesis
#2
Sandra Galic, Kim Loh, Lisa Murray-Segal, Gregory R Steinberg, Zane B Andrews, Bruce E Kemp
AMP-activated protein kinase (AMPK) is a known regulator of whole-body energy homeostasis, but the downstream AMPK substrates mediating these effects are not entirely clear. AMPK inhibits fatty acid synthesis and promotes fatty acid oxidation by phosphorylation of acetyl-CoA carboxylase (ACC) 1 at Ser 79 and ACC2 at Ser 212 . Using mice with Ser 79 Ala/Ser 212 Ala knock-in mutations (ACC DKI) we find that inhibition of ACC phosphorylation leads to reduced appetite in response to fasting or cold exposure. At sub-thermoneutral temperatures, ACC DKI mice maintain normal energy expenditure and thermogenesis, but fail to increase appetite and lose weight...
February 13, 2018: ELife
https://www.readbyqxmd.com/read/29430626/body-size-and-body-composition-effects-on-heat-loss-from-the-hands-during-severe-cold-exposure
#3
Stephanie Payne, Alison Macintosh, Jay Stock
OBJECTIVES: This study investigated the influence of body size and composition on maintaining hand temperature during severe cold exposure. The hand's high surface area-to-volume ratio predisposes the hand to heat loss, increasing the risk of cold injury and even hypothermia, which are major selective pressures in cold environments. While vasoregulation may reduce heat loss from the hand, the effect of body form, tissue thermogenesis, and body insulation on heat loss is unknown. MATERIALS AND METHODS: Thermal imaging was used to determine heat loss during a 3-min ice-water hand immersion test carried out on 114 volunteers (female = 63, male = 51)...
February 11, 2018: American Journal of Physical Anthropology
https://www.readbyqxmd.com/read/29414316/ppar%C3%AE-agonist-rosiglitazone-switches-fuel-preference-to-lipids-in-promoting-thermogenesis-under-cold-exposure-in-c57bl-6-mice
#4
Rong Gao, Wei Chen, Huang Yan, Xinni Xie, Dongqi Liu, Chenxi Wu, Zhaohui Zhu, Haijing Li, Fangting Dong, Lili Wang
Brown and beige adipose tissues play key roles in adaptive thermogenesis, which is essential for homoiotherms to maintain core temperature under cold exposure. PPARγ is a transcriptional regulator critical for brown adipose tissue (BAT) recruitment and white adipose tissue (WAT) browning. Here we evaluated the impact of PPARγ activation on thermogenic activity in C57BL/6 mice under thermo-neutral and 4 °C cold environment, and revealed the regulating mechanism and metabolic basis. Rosiglitazone slowed body temperature loss in cold environment in C57BL/6 mice, suppressed cold-induced decreases in blood glucose, reversed cold-promoted 18F-FDG uptake, and increased lipid consumption in BAT...
January 27, 2018: Journal of Proteomics
https://www.readbyqxmd.com/read/29378832/membrane-trafficking-protein-cdp138-regulates-fat-browning-and-insulin-sensitivity-through-controlling-catecholamine-release
#5
Qiong L Zhou, Ye Song, Chun-Hong Huang, Jun-Yuan Huang, Zhenwei Gong, Zhangping Liao, Andria G Sharma, Lily Greene, Justin Z Deng, Michael C Rigor, Xiangyang Xie, Songtao Qi, Julio E Ayala, Zhen Y Jiang
CDP138 is a calcium- and lipid-binding protein that is involved in membrane trafficking. Here we report mice without CDP138 develop obesity under normal chow diet (NCD) or high-fat diet (HFD) conditions. CDP138-/- mice have lower energy expenditure, oxygen consumption and body temperature in comparison with wild-type (WT) mice. CDP138 is exclusively expressed in adrenal medulla and is co-localized with tyrosine hydroxylase (TH), a marker of sympathetic nervous terminals, in the inguinal fat. In comparison with WT controls, CDP138-/- mice had altered catecholamine levels in the circulation, adrenal grand, and inguinal fat...
January 29, 2018: Molecular and Cellular Biology
https://www.readbyqxmd.com/read/29374543/lysosomal-acid-lipase-regulates-fatty-acid-channeling-in-brown-adipose-tissue-to-maintain-thermogenesis
#6
Madalina Duta-Mare, Vinay Sachdev, Christina Leopold, Dagmar Kolb, Nemanja Vujic, Melanie Korbelius, Dina C Hofer, Wenmin Xia, Katharina Huber, Martina Auer, Benjamin Gottschalk, Christoph Magnes, Wolfgang F Graier, Andreas Prokesch, Branislav Radovic, Juliane G Bogner-Strauss, Dagmar Kratky
Lysosomal acid lipase (LAL) is the only known enzyme, which hydrolyzes cholesteryl esters and triacylglycerols in lysosomes of multiple cells and tissues. Here, we explored the role of LAL in brown adipose tissue (BAT). LAL-deficient (Lal-/-) mice exhibit markedly reduced UCP1 expression in BAT, modified BAT morphology with accumulation of lysosomes, and mitochondrial dysfunction, consequently leading to regular hypothermic events in mice kept at room temperature. Cold exposure resulted in reduced lipid uptake into BAT, thereby aggravating dyslipidemia and causing life threatening hypothermia in Lal-/- mice...
January 24, 2018: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29357504/short-term-menthol-treatment-promotes-persistent-thermogenesis-without-induction-of-compensatory-food-consumption-in-rats-implications-for-obesity-control
#7
Robson Cristiano Lillo Vizin, Anna Carolina Parracho Motzko-Soares, Giovana Marchini Armentano, Debora T Ishikawa, Ariovaldo Pereira Cruz-Neto, Daniel Carneiro Carrettiero, Maria Camila Almeida
In this study, we aimed at evaluating the influence of daily repeated menthol treatments on body mass and thermoregulatory effectors in Wistar rats, considering that menthol is a TRPM8 channel agonist that mimics cold sensation and activates thermoregulatory cold-defense mechanisms in mammals, promoting hyperthermia and increasing energy expenditure, and has been suggested as an anti-obesity drug. Male Wistar rats were topically treated with 5% menthol for 3 or 9 consecutive days, while body mass, food intake, abdominal temperature, metabolism, cutaneous vasoconstriction and thermal preference were measured...
December 21, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29352512/trpv1-antagonists-that-cause-hypothermia-instead-of-hyperthermia-in-rodents-compounds-pharmacological-profiles-in-vivo-targets-thermoeffectors-recruited-and-implications-for-drug-development
#8
Andras Garami, Eszter Pakai, Heath A McDonald, Regina M Reilly, Arthur Gomtsyan, Joshua J Corrigan, Erika Pinter, Dawn X D Zhu, Sonya G Lehto, Narender R Gavva, Philip R Kym, Andrej A Romanovsky
AIM: Thermoregulatory side effects hinder the development of transient receptor potential vanilloid-1 (TRPV1) antagonists as new painkillers. While many antagonists cause hyperthermia, a well-studied effect, some cause hypothermia. The mechanisms of this hypothermia are unknown and were studied herein. METHODS: Two hypothermia-inducing TRPV1 antagonists, the newly synthesized A-1165901 and the known AMG7905, were used in physiological experiments in rats and mice...
January 20, 2018: Acta Physiologica
https://www.readbyqxmd.com/read/29341928/a-novel-brown-adipocyte-enriched-long-non-coding-rna-that-is-required-for-brown-adipocyte-differentiation-and-sufficient-to-drive-thermogenic-gene-program-in-white-adipocytes
#9
Yan Xiong, Feng Yue, Zhihao Jia, Yun Gao, Wen Jin, Keping Hu, Yong Zhang, Dahai Zhu, Gongshe Yang, Shihuan Kuang
The thermogenic activities of brown and beige adipocytes can be exploited to reduce energy surplus and counteract obesity. Recent RNA sequencing studies have uncovered a number of long noncoding RNAs (lncRNAs) uniquely expressed in white and brown adipose tissues (WAT and BAT), but whether and how these lncRNAs function in adipogenesis remain largely unknown. Here, we report the identification of a novel brown adipocyte-enriched LncRNA (AK079912), and its nuclear localization, function and regulation. The expression of AK079912 increases during brown preadipocyte differentiation and in response to cold-stimulated browning of white adipocytes...
January 13, 2018: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29326420/fasting-and-glucose-induced-thermogenesis-in-response-to-three-ambient-temperatures-a-randomized-crossover-trial-in-the-metabolic-syndrome
#10
K Pathak, R J Woodman, A P James, M J Soares
BACKGROUND/OBJECTIVES: Cold exposure increases thermogenesis and could improve insulin sensitivity. We hypothesized a blunted response in the metabolic syndrome (MetS). SUBJECTS/METHODS: Twenty older adults 59 ± 10.4 years (with MetS, MetS+, n = 9; without MetS, MetS-, n = 11) completed a randomized crossover design of 3.5 h exposures to 20, 25 and 27 °C on three visits. After an hour's rest at the desired temperature, resting metabolic rate (RMR), respiratory quotient (RQ), forearm to fingertip gradients (FFG), and in the ear temperature (IET) were measured over 30 min...
January 11, 2018: European Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/29320712/serca2b-cycles-its-way-to-ucp1-independent-thermogenesis-in-beige-fat
#11
Emilio P Mottillo, Vanesa D Ramseyer, James G Granneman
A new study in Nature Medicine, by Ikeda et al. (2017), reports that calcium cycling in beige adipocytes elevates energy expenditure and glucose oxidation in the absence of uncoupling protein 1. Thermogenic calcium cycling in beige fat is mediated by SERCA2b and improves cold tolerance and metabolic status.
January 9, 2018: Cell Metabolism
https://www.readbyqxmd.com/read/29310935/degradation-of-brown-adipocyte-purine-nucleotides-regulates-uncoupling-protein-1-activity
#12
Tobias Fromme, Karin Kleigrewe, Andreas Dunkel, Angelika Retzler, Yongguo Li, Stefanie Maurer, Natascha Fischer, Rolf Diezko, Timo Kanzleiter, Verena Hirschberg, Thomas Hofmann, Martin Klingenspor
OBJECTIVE: Non-shivering thermogenesis in mammalian brown adipose tissue depends on thermogenic uncoupling protein 1. Its activity is triggered by free fatty acids while purine nucleotides mediate inhibition. During activation, it is thought that free fatty acids overcome purine-mediated inhibition. We measured the cellular concentration and the release of purine nucleotide metabolites to uncover a possible role of purine nucleotide degradation in uncoupling protein 1 activation. METHODS: With mass spectrometry, purine nucleotide metabolites were quantified in cellular homogenates and supernatants of cultured primary brown adipocytes...
December 26, 2017: Molecular Metabolism
https://www.readbyqxmd.com/read/29277701/oxytocin-and-the-warm-outer-glow-thermoregulatory-deficits-cause-huddling-abnormalities-in-oxytocin-deficient-mouse-pups
#13
Christopher Harshaw, Joseph K Leffel, Jeffrey R Alberts
Oxytocin is a social and reproductive hormone that also plays critical roles in a range of homeostatic processes, including thermoregulation. Here, we examine the role of oxytocin (OT) as a mediator of brown adipose tissue (BAT) thermogenesis, cold-induced huddling, and positive thermotaxis in eight-day-old (PD8) OT 'knock out' (OTKO) mouse pups. We tested OTKO and wildtype (WT) pups in single- and mixed-genotype groups of six, exposing these to a period of ambient warmth (~35°C) followed by a period of cold (~21...
December 22, 2017: Hormones and Behavior
https://www.readbyqxmd.com/read/29235464/syk-kinase-mediates-brown-fat-differentiation-and-activation
#14
Marko Knoll, Sally Winther, Anirudh Natarajan, Huan Yang, Mengxi Jiang, Prathapan Thiru, Aliakbar Shahsafaei, Tony E Chavarria, Dudley W Lamming, Lei Sun, Jacob B Hansen, Harvey F Lodish
Brown adipose tissue (BAT) metabolism influences glucose homeostasis and metabolic health in mice and humans. Sympathetic stimulation of β-adrenergic receptors in response to cold induces proliferation, differentiation, and UCP1 expression in pre-adipocytes and mature brown adipocytes. Here we show that spleen tyrosine kinase (SYK) is upregulated during brown adipocyte differentiation and activated by β-adrenergic stimulation. Deletion or inhibition of SYK, a kinase known for its essential roles in the immune system, blocks brown and white pre-adipocyte proliferation and differentiation in vitro, and results in diminished expression of Ucp1 and other genes regulating brown adipocyte function in response to β-adrenergic stimulation...
December 13, 2017: Nature Communications
https://www.readbyqxmd.com/read/29210120/endogenous-peripheral-hydrogen-sulfide-is-propyretic-its-permissive-role-in-brown-adipose-tissue-thermogenesis-in-rats
#15
Renato N Soriano, Sara P Braga, Jéssica S C Breder, Marcelo E Batalhao, Gabriela R Oliveira-Pelegrin, Luiz Fernando R Ferreira, Maria José A Rocha, Evelin C Carnio, Luiz G S Branco
In recent years hydrogen sulfide (H2 S) has been reported as a gaseous modulator acting in several tissues in health and disease. In systemic inflammation animal models, plasma H2 S concentration increases in response to endotoxin (bacterial lipopolysaccharide, LPS). The most striking response in the acute phase reaction of systemic inflammation is fever, but reports of the peripheral action of H2 S on this thermoregulatory response are not found. We aimed at investigating whether endogenous systemic H2 S modulates LPS-induced fever...
December 6, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/29209779/central-regulation-of-brown-adipose-tissue-thermogenesis-and-energy-homeostasis-dependent-on-food-availability
#16
REVIEW
Yoshiko Nakamura, Kazuhiro Nakamura
Energy homeostasis of mammals is maintained by balancing energy expenditure within the body and energy intake through feeding. Several lines of evidence indicate that brown adipose tissue (BAT), a sympathetically activated thermogenic organ, turns excess energy into heat to maintain the energy balance in rodents and humans, in addition to its thermoregulatory role for the defense of body core temperature in cold environments. Elucidating the central circuit mechanism controlling BAT thermogenesis dependent on nutritional conditions and food availability in relation to energy homeostasis is essential to understand the etiology of symptoms caused by energy imbalance, such as obesity...
December 5, 2017: Pflügers Archiv: European Journal of Physiology
https://www.readbyqxmd.com/read/29203476/ucp1-deficiency-increases-adipose-tissue-monounsaturated-fatty-acid-synthesis-and-trafficking-to-the-liver
#17
Laura M Bond, James M Ntambi
Uncoupling protein-1 (UCP1) facilitates thermogenesis in brown and beige adipocytes and can promote energy expenditure by decreasing mitochondrial respiratory efficiency. Defects in UCP1 and brown adipose tissue thermogenesis subject animals to chronic cold stress and elicit compensatory responses to generate heat. How UCP1 regulates white adipose tissue (WAT) lipid biology and tissue crosstalk is not completely understood. Here, we probe the effect of UCP1 deficiency on fatty acid metabolism in inguinal and epididymal WAT and investigate how these metabolic perturbations influence hepatic lipid homeostasis...
December 3, 2017: Journal of Lipid Research
https://www.readbyqxmd.com/read/29200996/regulation-of-brown-adipose-tissue-activity-by-interoceptive-cns-pathways-the-interaction-between-brain-and-periphery
#18
Otto Muzik, Vaibhav A Diwadkar
To maintain thermal homeostasis, specific thermogenic tissues are under the control of central thermoregulatory networks that regulate the body's response to thermal challenges. One of these mechanisms involves non-shivering thermogenesis in brown adipose tissue (BAT), which is activated in cold environments in order to defend the body against physical damage as a result of hypothermia. The objective of our study was to assess the interaction between CNS thermoregulatory pathways and sympathetic innervation in BAT during a cold exposure paradigm...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/29170642/muscle-non-shivering-thermogenesis-and-its-role-in-the-evolution-of-endothermy
#19
REVIEW
Julia Nowack, Sylvain Giroud, Walter Arnold, Thomas Ruf
The development of sustained, long-term endothermy was one of the major transitions in the evolution of vertebrates. Thermogenesis in endotherms does not only occur via shivering or activity, but also via non-shivering thermogenesis (NST). Mammalian NST is mediated by the uncoupling protein 1 in the brown adipose tissue (BAT) and possibly involves an additional mechanism of NST in skeletal muscle. This alternative mechanism is based on Ca(2+)-slippage by a sarcoplasmatic reticulum Ca(2+)-ATPase (SERCA) and is controlled by the protein sarcolipin...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29153407/brown-fat-akt2-is-a-cold-induced-kinase-that-stimulates-chrebp-mediated-de-novo-lipogenesis-to-optimize-fuel-storage-and-thermogenesis
#20
Joan Sanchez-Gurmaches, Yuefeng Tang, Naja Zenius Jespersen, Martina Wallace, Camila Martinez Calejman, Sharvari Gujja, Huawei Li, Yvonne J K Edwards, Christian Wolfrum, Christian M Metallo, Søren Nielsen, Camilla Scheele, David A Guertin
Brown adipose tissue (BAT) is a therapeutic target for metabolic diseases; thus, understanding its metabolic circuitry is clinically important. Many studies of BAT compare rodents mildly cold to those severely cold. Here, we compared BAT remodeling between thermoneutral and mild-cold-adapted mice, conditions more relevant to humans. Although BAT is renowned for catabolic β-oxidative capacity, we find paradoxically that the anabolic de novo lipogenesis (DNL) genes encoding ACLY, ACSS2, ACC, and FASN were among the most upregulated by mild cold and that, in humans, DNL correlates with Ucp1 expression...
January 9, 2018: Cell Metabolism
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