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https://www.readbyqxmd.com/read/29040448/male-brown-fat-specific-double-knockout-of-igfir-ir-atrophy-mitochondrial-fission-failure-impaired-thermogenesis-and-obesity
#1
Vanesa Viana-Huete, Carlos Guillén, Gema García, Silvia Fernández, Ana García-Aguilar, C R Kahn, Manuel Benito
It is unknown how the lack of IR (insulin receptor)/ IGFIR (insulin like growth factor receptor) in a tissue-specific manner does affect brown fat development and mitochondrial integrity and function and its impact on the redistribution of the adipose organ and the metabolic status. To address this important issue, we have developed the IR/IGFIR double knockout in brown adipose tissue-specific manner (DKO). Lack of those receptors caused a severe brown fat atrophy, an enhanced beige cell clusters in inguinal fat, loss of mitochondrial mass, mitochondrial damage related to cristae disruption, and the loss of proteins involved in autophagosome formation, mitophagy, mitochondrial quality control and dynamics and thermogenesis...
October 10, 2017: Endocrinology
https://www.readbyqxmd.com/read/29040444/re-establishment-of-energy-balance-in-a-male-mouse-model-with-pomc-neuron-deletion-of-bmpr1a
#2
Kristy L Townsend, Christopher Madden, Magdalena Blaszkiewicz, Lindsay McDougall, Domenico Tupone, Matthew D Lynes, Yuji Mishina, Paul Yu, Shaun Morrison, Yu-Hua Tseng
The regulation of energy balance involves complex processes in the brain, including coordination by hypothalamic neurons that contain pro-opiomelanocortin (POMC). We previously demonstrated that central bone morphogenetic protein 7 (BMP7) reduces appetite. Now we show that a type 1 BMP receptor, BMPR1A, is co-localized with POMC neurons and POMC-BMPR1A-KO mice are hyperphagic, revealing physiological involvement of BMP signaling in anorectic POMC neurons in the regulation of appetite. Surprisingly, the hyperphagic POMC-BMPR1A-KO mice exhibit a lack of obesity, even on a 45% high-fat diet...
October 9, 2017: Endocrinology
https://www.readbyqxmd.com/read/29040389/the-anti-epileptic-ketogenic-diet-alters-hippocampal-transporter-levels-and-reduces-adiposity-in-aged-rats
#3
Abbi R Hernandez, Caesar M Hernandez, Keila T Campos, Leah M Truckenbrod, Yasemin Sakarya, Joseph A McQuail Ph D, Christy S Carter, Jennifer L Bizon, Andrew P Maurer, Sara N Burke
Nutritional ketosis is induced by high fat/low carbohydrate dietary regimens, which produce high levels of circulating ketone bodies, shifting metabolism away from glucose utilization. While ketogenic diets (KD) were initially introduced to suppress seizures, they are garnering attention for their potential to treat a myriad of neurodegenerative and metabolic disorders that are associated with advanced age. The feasibility and physiological impact of implementing a long-term KD in old animals, however, has not been systematically examined...
October 12, 2017: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/29036010/the-reasoning-beyond-the-potential-use-of-exclusive-enteral-nutrition-and-other-specified-diets-in-children-with-ulcerative-colitis
#4
Ron Shaoul, Stephanie Brown, Andrew S Day
The incidence of inflammatory bowel disease (IBD) is steadily on the rise in Western as well as in developing countries paralleling the increase of westernized diets, characterized by high protein and fat as well as excessive sugar intake, with less vegetables and fiber. Furthermore, nutrition is involved in several aspects of pediatric inflammatory bowel disease (IBD), ranging from disease etiology to induction and maintenance of remission of disease. Exclusive enteral nutrition (EEN) has been shown to induce remission, including in patients with isolated colonic disease, and leads to mucosal healing in Crohn disease (CD)...
October 13, 2017: Journal of Pediatric Gastroenterology and Nutrition
https://www.readbyqxmd.com/read/29035364/sympathetic-neuron-associated-macrophages-contribute-to-obesity-by-importing-and-metabolizing-norepinephrine
#5
Roksana M Pirzgalska, Elsa Seixas, Jason S Seidman, Verena M Link, Noelia Martínez Sánchez, Inês Mahú, Raquel Mendes, Vitka Gres, Nadiya Kubasova, Imogen Morris, Bernardo A Arús, Chelsea M Larabee, Miguel Vasques, Francisco Tortosa, Ana L Sousa, Sathyavathy Anandan, Erin Tranfield, Maureen K Hahn, Matteo Iannacone, Nathanael J Spann, Christopher K Glass, Ana I Domingos
The cellular mechanism(s) linking macrophages to norepinephrine (NE)-mediated regulation of thermogenesis have been a topic of debate. Here we identify sympathetic neuron-associated macrophages (SAMs) as a population of cells that mediate clearance of NE via expression of solute carrier family 6 member 2 (SLC6A2), an NE transporter, and monoamine oxidase A (MAOA), a degradation enzyme. Optogenetic activation of the sympathetic nervous system (SNS) upregulates NE uptake by SAMs and shifts the SAM profile to a more proinflammatory state...
October 9, 2017: Nature Medicine
https://www.readbyqxmd.com/read/29035280/adipocyte-cannabinoid-receptor-cb1-regulates-energy-homeostasis-and-alternatively-activated-macrophages
#6
Inigo Ruiz de Azua, Giacomo Mancini, Raj Kamal Srivastava, Alejandro Aparisi Rey, Pierre Cardinal, Laura Tedesco, Cristina Maria Zingaretti, Antonia Sassmann, Carmelo Quarta, Claudia Schwitter, Andrea Conrad, Nina Wettschureck, V Kiran Vemuri, Alexandros Makriyannis, Jens Hartwig, Maria Mendez-Lago, Laura Bindila, Krisztina Monory, Antonio Giordano, Saverio Cinti, Giovanni Marsicano, Stefan Offermanns, Enzo Nisoli, Uberto Pagotto, Daniela Cota, Beat Lutz
Dysregulated adipocyte physiology leads to imbalanced energy storage, obesity, and associated diseases, imposing a costly burden on current health care. Cannabinoid receptor type-1 (CB1) plays a crucial role in controlling energy metabolism through central and peripheral mechanisms. In this work, adipocyte-specific inducible deletion of the CB1 gene (Ati-CB1-KO) was sufficient to protect adult mice from diet-induced obesity and associated metabolic alterations and to reverse the phenotype in already obese mice...
October 16, 2017: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/29035138/body-weight-predicts-nicotinamide-n-methyltransferase-activity-in-mouse-fat
#7
Bianca Rudolphi, Benedikt Zapp, Nils A Kraus, Franziska Ehebauer, Bettina J Kraus, Daniel Kraus
AIM: Nicotinamide N-methyltransferase (NNMT) is a novel regulator of energy homeostasis in adipose tissue. NNMT expression is higher in obese mice than in lean mice, and NNMT knockdown prevents diet-induced obesity. Little is known about the regulation of enzyme activity during the development of obesity. The aim of this study was to analyze NNMT activity in tissues of mice with incipient and established obesity. METHODS: A fluorescence-based, sensitive, low-volume, high-throughput method was developed to assay NNMT activity...
October 16, 2017: Endocrine Research
https://www.readbyqxmd.com/read/29033835/farnesol-has-an-anti-obesity-effect-in-high-fat-diet-induced-obese-mice-and-induces-the-development-of-beige-adipocytes-in-human-adipose-tissue-derived-mesenchymal-stem-cells
#8
Hye-Lin Kim, Yunu Jung, Jinbong Park, Dong-Hyun Youn, JongWook Kang, Seona Lim, Beom Su Lee, Mi-Young Jeong, Seong-Kyu Choe, Raekil Park, Kwang Seok Ahn, Jae-Young Um
Brown adipocytes dissipate energy as heat and hence have an important therapeutic capacity for obesity. Development of brown-like adipocytes (also called beige) is also another attractive target for obesity treatment. Here, we investigated the effect of farnesol, an isoprenoid, on adipogenesis in adipocytes and on the browning of white adipose tissue (WAT) as well as on the weight gain of high-fat diet (HFD)-induced obese mice. Farnesol inhibited adipogenesis and the related key regulators including peroxisome proliferator-activated receptor γ (PPARγ) and CCAAT/enhancer binding protein α through the up-regulation of AMP-activated protein kinase in 3T3-L1 murine adipocytes and human adipose tissue-derived mesenchymal stem cells (hAMSCs)...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/29031716/adipocyte-glucocorticoid-receptor-is-important-in-lipolysis-and-insulin-resistance-due-to-exogenous-steroids-but-not-insulin-resistance-caused-by-high-fat-feeding
#9
Yachen Shen, Hyun Cheol Roh, Manju Kumari, Evan D Rosen
OBJECTIVE: The critical role of adipose tissue in energy and nutrient homeostasis is influenced by many external factors, including overnutrition, inflammation, and exogenous hormones. Prior studies have suggested that glucocorticoids (GCs) in particular are major drivers of physiological and pathophysiological changes in adipocytes. In order to determine whether these effects directly require the glucocorticoid receptor (GR) within adipocytes, we generated adipocyte-specific GR knockout (AGRKO) mice...
October 2017: Molecular Metabolism
https://www.readbyqxmd.com/read/29026214/treatment-with-the-tgf-b-superfamily-cytokine-mic-1-gdf15-reduces-the-adiposity-and-corrects-the-metabolic-dysfunction-of-mice-with-diet-induced-obesity
#10
Vw-W Tsai, H P Zhang, R Manandhar, K K M Lee-Ng, H Lebhar, C P Marquis, Y Husaini, A Sainsbury, D A Brown, S N Breit
OBJECTIVES: To test the potential efficacy of recombinant macrophage inhibitory cytokine-1 (MIC-1/GDF15) as an obesity therapeutic. METHODS: Male C57BL/6J mice, either fed on normal-chow or high-fat-diet for 16 weeks in order to induce diet-induced obesity, were infused with either recombinant MIC-1/GDF15 or vehicle for 34 days by osmotic-mini-pump. During the experimental period metabolic parameters were measured. Blood and tissue were collected for analysis of inflammatory markers...
October 13, 2017: International Journal of Obesity: Journal of the International Association for the Study of Obesity
https://www.readbyqxmd.com/read/29023211/factors-influencing-dietary-fat-intake-among-black-emerging-adults
#11
Shalonda E B Horton, Gayle M Timmerman, Adama Brown
OBJECTIVE: To determine what factors influenced dietary fat intake (DFI) among Black emerging adults. PARTICIPANTS: Sample included 251 Black emerging adults, ages 18-25 years, living in the U.S. METHODS: This was a non-experimental cross sectional study based on self-report data. RESULTS: The sample had high DFI. Factors related to DFI were gender (rpb = -.22, p < .001), perceived barriers for healthy eating (r = ...
October 12, 2017: Journal of American College Health: J of ACH
https://www.readbyqxmd.com/read/29021924/large-unilateral-adrenal-mass-with-surrounding-brown-fat-a-case-report
#12
Gabriel O Ologun, Zinal M Patel, Navpreet K Rana, Andrew Trecartin, Alice Shen, Douglas Trostle, David Bertsch
Pheochromocytomas are rare tumors derived from chromaffin cells located in the adrenal and extra adrenal tissues. Pheochromocytomas are diagnosed biochemically and localized using different imaging modalities. The definitive management is surgical resection. Brown adipose tissues are normally present during fetal development, with regression over time. Brown adipose tissues are thermogenic and usually located in the neck, mediastinum, and retroperitoneum. Here, we report a case of a unilateral pheochromocytoma surrounded by brown fat...
August 9, 2017: Curēus
https://www.readbyqxmd.com/read/28993285/insulin-like-peptides-and-dna-trna-methyltransferases-are-involved-in-the-nutritional-regulation-of-female-reproduction-in-nilaparvata-lugens-st%C3%A3-l
#13
Kai Lu, Xia Chen, Wenru Li, Yue Li, Zhichao Zhang, Qiang Zhou
Insulin-like peptides (ILPs) sense and transduce nutritional information and are linked to female reproduction in many insect species. Our previous studies have shown that "Target of rapamycin" (TOR) pathway functions through juvenile hormone (JH) to regulate amino acids-mediated vitellogenesis in the brown planthopper, Nilaparvata lugens, one of the most destructive rice pests in Asia. Recent reports have demonstrated that DNA methyltransferases (Dnmts) are also involved in female reproduction of N. lugens...
October 7, 2017: Gene
https://www.readbyqxmd.com/read/28990936/olfactory-receptor-544-reduces-adiposity-by-steering-fuel-preference-toward-fats
#14
Chunyan Wu, Su Hyeon Hwang, Yaoyao Jia, Joobong Choi, Yeon-Ji Kim, Dahee Choi, Duleepa Pathiraja, In-Geol Choi, Seung-Hoi Koo, Sung-Joon Lee
Olfactory receptors (ORs) are present in tissues outside the olfactory system; however, the function of these receptors remains relatively unknown. Here, we determined that olfactory receptor 544 (Olfr544) is highly expressed in the liver and adipose tissue of mice and regulates cellular energy metabolism and obesity. Azelaic acid (AzA), an Olfr544 ligand, specifically induced PKA-dependent lipolysis in adipocytes and promoted fatty acid oxidation (FAO) and ketogenesis in liver, thus shifting the fuel preference to fats...
October 9, 2017: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/28989572/effects-of-ingredients-of-korean-brown-rice-cookies-on-attenuation-of-cholesterol-level-and-oxidative-stress-in-high-fat-diet-fed-mice
#15
Sun Hee Hong, Mijeong Kim, Minji Woo, Yeong Ok Song
BACKGROUND/OBJECTIVES: Owing to health concerns related to the consumption of traditional snacks high in sugars and fats, much effort has been made to develop functional snacks with low calorie content. In this study, a new recipe for Korean rice cookie, dasik, was developed and its antioxidative, lipid-lowering, and anti-inflammatory effects and related mechanisms were elucidated. The effects were compared with those of traditional rice cake dasik (RCD), the lipid-lowering effect of which is greater than that of traditional western-style cookies...
October 2017: Nutrition Research and Practice
https://www.readbyqxmd.com/read/28988965/do-estrogens-enhance-activation-of-brown-and-beiging-of-adipose-tissues
#16
Aaron P Frank, Biff F Palmer, Deborah J Clegg
Obesity and its associated co-morbidities are worldwide public health concerns. Obesity is characterized by excessive adipose tissue accumulation; however, it is important to recognize that human and rodent adipose tissues are made up of several distinct adipose tissue sub-types. White adipose tissue (WAT) is considered the prototypical fat cell, due to its capacity and capability to store large amounts of lipid. In contrast, brown adipose tissue (BAT) oxidizes substrates to generate heat. BAT contains more mitochondria than WAT and express uncoupling protein-1 (UCP1), which mediates BAT thermogenesis...
October 5, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28988821/cold-induced-thermogenesis-depends-on-atgl-mediated-lipolysis-in-cardiac-muscle-but-not-brown-adipose-tissue
#17
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/28988565/effect-of-age-and-gender-on-carcass-traits-and-meat-quality-of-farmed-brown-hares
#18
A Trocino, M Birolo, S Dabbou, F Gratta, N Rigo, G Xiccato
A total of 48 sub-adult hares and adult reproducing farmed hares were used to characterize carcass and meat traits according to the age and gender of animals. With respect to carcass traits, when age increased, the carcass weight significantly increased (2022 to 3391 g; P<0.001), but dressing out percentages did not change. The dissectible fat (1.3% to 2.2%; P<0.05) and Longissimus lumborum (LL) proportions (13.5% to 14.5%; P<0.001) and muscle-to-bone ratio of hind legs (5.11 to 6.23; P<0.001) increased, whereas the hind leg proportions decreased (37...
October 9, 2017: Animal: An International Journal of Animal Bioscience
https://www.readbyqxmd.com/read/28986166/sildenafil-induces-browning-of-subcutaneous-white-adipose-tissue-in-overweight-adults
#19
Shuguang Li, Yixiang Li, Lin Xiang, Jing Dong, Min Liu, Guangda Xiang
OBJECTIVE: To investigate that short-term treatment of sildenafil can induce browning of subcutaneous white adipose tissue (sWAT) in human adults. DESIGN: A randomized, double-blinded, placebo-controlled, parallel group trial. METHODS: Sixteen eligibility overweight male subjects were recruited, comparing 100 mg/day sildenafil versus an identical placebo therapy for 7 days. sWAT samples were collected from subjects before and after 7-day sildenafil or placebo intervention...
October 3, 2017: Metabolism: Clinical and Experimental
https://www.readbyqxmd.com/read/28983743/pet-imaging-of-human-brown-adipose-tissue-with-the-tspo-tracer-11-c-pbr28
#20
Chongzhao Ran, Daniel S Albrecht, Miriam A Bredella, Jing Yang, Jian Yang, Steven H Liang, Aaron M Cypess, Marco L Loggia, Nazem Atassi, Anna Moore
PURPOSE: Brown adipose tissue (BAT) in adult humans has been recently rediscovered and intensively investigated as a new potential therapeutic target for obesity and type 2 diabetes (T2D). However, reliable assessment of BAT mass in vivo represents a considerable challenge. The purpose of this investigation is to demonstrate for the first time that human BAT depots can be imaged with a translocator protein (TSPO)-specific positron emission tomography (PET) tracer [(11)C]PBR28 under thermoneutral conditions...
October 5, 2017: Molecular Imaging and Biology: MIB: the Official Publication of the Academy of Molecular Imaging
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