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https://www.readbyqxmd.com/read/27900258/adipocyte-specific-hypoxia-inducible-gene-2-promotes-fat-deposition-and-diet-induced-insulin-resistance
#1
Marina T DiStefano, Rachel J Roth Flach, Ozlem Senol-Cosar, Laura V Danai, Joseph V Virbasius, Sarah M Nicoloro, Juerg Straubhaar, Sezin Dagdeviren, Martin Wabitsch, Olga T Gupta, Jason K Kim, Michael P Czech
OBJECTIVE: Adipose tissue relies on lipid droplet (LD) proteins in its role as a lipid-storing endocrine organ that controls whole body metabolism. Hypoxia-inducible Gene 2 (Hig2) is a recently identified LD-associated protein in hepatocytes that promotes hepatic lipid storage, but its role in the adipocyte had not been investigated. Here we tested the hypothesis that Hig2 localization to LDs in adipocytes promotes adipose tissue lipid deposition and systemic glucose homeostasis. METHOD: White and brown adipocyte-deficient (Hig2(fl/fl) × Adiponection cre+) and selective brown/beige adipocyte-deficient (Hig2(fl/fl) × Ucp1 cre+) mice were generated to investigate the role of Hig2 in adipose depots...
December 2016: Molecular Metabolism
https://www.readbyqxmd.com/read/27891164/a-low-carbohydrate-high-fat-diet-decreases-lean-mass-and-impairs-cardiac-function-in-pair-fed-female-c57bl-6j-mice
#2
Jessica Nilsson, Madelene Ericsson, Masoumeh Motamedi Joibari, Fredrick Anderson, Leif Carlsson, Stefan K Nilsson, Anna Sjödin, Jonas Burén
BACKGROUND: Excess body fat is a major health issue and a risk factor for the development of numerous chronic diseases. Low-carbohydrate diets like the Atkins Diet are popular for rapid weight loss, but the long-term consequences remain the subject of debate. The Scandinavian low-carbohydrate high-fat (LCHF) diet, which has been popular in Scandinavian countries for about a decade, has very low carbohydrate content (~5 E %) but is rich in fat and includes a high proportion of saturated fatty acids...
2016: Nutrition & Metabolism
https://www.readbyqxmd.com/read/27882331/ectopic-fat-deposition-on-insulin-sensitivity-correlation-of-hepatocellular-lipid-content-and-m-value
#3
Beverly S Hong, Ying Li, Shuiqing Lai, Juan Liu, Hongyu Guan, Weijian Ke, Xiaoying He, Yanbing Li
Purpose. This study aimed to explore the relationship among insulin sensitivity and ectopic fat depots in participants with different glucose status. Methods. Fifty-nine men and women were enrolled in this study: 29 with normal glucose tolerance (NGT), 17 with impaired glucose tolerance (IGT), and 13 with type 2 diabetes mellitus (T2DM). All participants underwent a hyperinsulinemic-euglycemic clamp to assess the insulin sensitivity index (M value) and magnetic resonance imaging to measure the hepatocellular lipid content (HCL), skeletal muscle fat content including intramyocellular lipid (IMCL) and extramyocellular lipid (EMCL) of tibialis anterior (ta), and soleus muscle (sol)...
2016: Journal of Diabetes Research
https://www.readbyqxmd.com/read/27879248/high-fat-diet-induced-obesity-regulates-mmp3-to-modulate-depot-and-sex-dependent-adipose-expansion-in-c57bl-6j-mice
#4
Yuanyuan Wu, Mi-Jeong Lee, Yasuo Ido, Susan K Fried
Increased adipocyte size is hypothesized to signal the recruitment of adipose progenitor cells (APCs) to expand tissue storage capacity. To investigate depot- and sex-differences in adipose growth, male and female C57BL/6J mice (10-weeks-old) were challenged with high fat (HF) or low fat (LF) diets (D) for 14 weeks. The HFD increased gonadal (GON) depot weight by adipocyte hypertrophy and hyperplasia in females, but hypertrophy alone in males. In both sexes, inguinal (ING) adipocytes were smaller than GON and depot expansion was due to hypertrophy...
November 22, 2016: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/27862896/homozygous-lipe-mutation-in-siblings-with-multiple-symmetric-lipomatosis-partial-lipodystrophy-and-myopathy
#5
Sagit Zolotov, Chao Xing, Riad Mahamid, Adel Shalata, Mohammed Sheikh-Ahmad, Abhimanyu Garg
Despite considerable progress in identifying causal genes for lipodystrophy syndromes, the molecular basis of some peculiar adipose tissue disorders remains obscure. In an Israeli-Arab pedigree with a novel autosomal recessive, multiple symmetric lipomatosis (MSL), partial lipodystrophy and myopathy, we conducted exome sequencing of two affected siblings to identify the disease-causing mutation. The 41-year-old female proband and her 36-year-old brother reported marked accumulation of subcutaneous fat in the face, neck, axillae, and trunk but loss of subcutaneous fat from the lower extremities and progressive distal symmetric myopathy during adulthood...
November 11, 2016: American Journal of Medical Genetics. Part A
https://www.readbyqxmd.com/read/27859461/gene-expression-profiles-of-human-subcutaneous-and-visceral-adipose-derived-stem-cells
#6
Boyun Kim, Boram Lee, Mi-Kyung Kim, Seung Pyo Gong, Noh Hyun Park, Hyun Hoon Chung, Hee Seung Kim, Jae Hong No, Woong Yang Park, Ae Kyung Park, Jeong Mook Lim, Yong Sang Song
Subcutaneous and visceral adipose tissues show a different risk effect on metabolic disorders because they have distinct cellular properties. We isolated stem cells from the separate human adipose tissues to investigate that subcutaneous and visceral fat depots have metabolic differences. Adipose-derived stem cells (ASCs) were characterized by immunophenotype and differentiation potentials into adipogenic, osteogenic, and chondrogenic lineages. Although subcutaneous and visceral ASCs (S-ASC and V-ASC) express same surface markers (CD31(-) , CD34(-) , CD45(-) , CD73(+) , CD90(+) , and CD105(+) ) and have differentiation potentials, S-ASCs had higher capacity to proliferate and to differentiate into adipogenic lineage than V-ASCs...
November 17, 2016: Cell Biochemistry and Function
https://www.readbyqxmd.com/read/27858139/lactobacillus-plantarum-hac01-regulates-gut-microbiota-and-adipose-tissue-accumulation-in-a-diet-induced-obesity-murine-model
#7
Soyoung Park, Yosep Ji, Hoe-Yune Jung, Hyunjoon Park, Jihee Kang, Sang-Haeng Choi, Heuynkil Shin, Chang-Kee Hyun, Kyong-Tai Kim, Wilhelm H Holzapfel
The functional features of Lactobacillus plantarum HAC01 (HAC01), isolated from fermented Korean kimchi, were studied with regard to the fat mass, immunometabolic biomarkers and dysbiosis in a diet-induced obesity (DIO) murine model. L. rhamnosus GG (LGG) served as reference strain and a PBS-treated group as control. The administration of L. plantarum HAC01 resulted in reduction of the mesenteric adipose depot, the conjunctive tissue closely associated with the gastrointestinal tract, where lipid oxidative gene expression was upregulated compared to the control group...
November 17, 2016: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/27856485/ectopic-fat-depots-and-coronary-artery-calcium-in-south-asians-compared-with-other-racial-ethnic-groups
#8
Sachin K Garg, Feng Lin, Namratha Kandula, Jingzhong Ding, Jeffrey Carr, Matthew Allison, Kiang Liu, David Herrington, Dhananjay Vaidya, Eric Vittinghoff, Alka M Kanaya
BACKGROUND: South Asians have a low body mass index and high prevalence of cardiovascular disease (CVD) relative to other racial/ethnic groups. Radiographically detected ectopic fat distribution is better associated with CVD than body mass index. We assessed whether differences in ectopic fat depots explained differences in the prevalence/severity of coronary artery calcium (CAC), a predictor of incident CVD events, among South Asians compared with other racial/ethnic groups. METHODS AND RESULTS: We examined the associations of radiographically detected visceral, intermuscular, intrahepatic, and pericardial fat with CAC among adults without baseline CVD...
November 17, 2016: Journal of the American Heart Association
https://www.readbyqxmd.com/read/27856429/knock-down-of-ptrf-ameliorates-adipocyte-differentiation-and-functionality-of-human-mesenchymal-stem-cells
#9
Sergio Perez-Diaz, Beatriz Garcia-Rodriguez, Yolanda Gonzalez-Irazabal, Monica Valero, Javier Lagos, J M Arbones-Mainar
Healthy expansion of human adipose tissue requires mesenchymal stem cells (hMSC) able to proliferate and differentiate into mature adipocytes. Characterization of those factors that coordinate hMSC-to-adipocyte transition is hence of paramount importance to modulate the adipose tissue expansion. It has been previously reported that the adipogenic program of hMSC can be disrupted by up-regulating caveolar proteins and Polymerase I and Transcript Release Factor (PTRF) is an integral component of caveolae highly expressed in adipose tissue...
November 16, 2016: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/27853670/features-of-omental-adipose-tissue-in-endometrial-cancer-patients-with-standard-or-metabolically-healthy-obesity-associations-with-tumor-process-characteristics
#10
Lev M Berstein, Aglaya G Iyevleva, Marina S Mukhina, Dmitry A Vasilyev, Tatyana E Poroshina
PURPOSE: Adipose tissue products may contribute to endometrial cancer (EC) initiation and further growth that encourages the analysis of this issue in patients with different obesity phenotypes. METHODS/PATIENTS: Omental fat depot characteristics were studied in EC patients (n = 57) with "standard" (SO) or "metabolically healthy" (MHO) obesity. Collected omental samples were evaluated by immunohistochemistry /IHC/ for brown fat marker UCP1, CYP19 (aromatase) and macrophage infiltration markers (CD68, CD163, crown-like structures/CLS) expression...
2016: SpringerPlus
https://www.readbyqxmd.com/read/27844208/sirtuins-1-7-expression-in-human-adipose-derived-stem-cells-from-subcutaneous-and-visceral-fat-depots-influence-of-obesity-and-hypoxia
#11
Stefania Mariani, Giuliana Di Rocco, Gabriele Toietta, Matteo A Russo, Elisa Petrangeli, Luisa Salvatori
The sirtuin family comprises seven NAD(+)-dependent deacetylases which control the overall health of organisms through the regulation of pleiotropic metabolic pathways. Sirtuins are important modulators of adipose tissue metabolism and their expression is higher in lean than obese subjects. At present, the role of sirtuins in adipose-derived stem cells has not been investigated yet. Therefore, in this study, we evaluated the expression of the complete panel of sirtuins in adipose-derived stem cells isolated from both subcutaneous and visceral fat of non-obese and obese subjects...
November 14, 2016: Endocrine
https://www.readbyqxmd.com/read/27827997/fto-deficiency-affects-the-gene-and-microrna-expression-involved-in-brown-adipogenesis-and-browning-of-white-adipose-tissue-in-mice
#12
Justiina Ronkainen, Eleonora Mondini, Francesca Cinti, Saverio Cinti, Sylvain Sebért, Markku J Savolainen, Tuire Salonurmi
Genetic variants in the fat mass- and obesity-associated gene Fto are linked to the onset of obesity in humans. The causal role of the FTO protein in obesity is supported by evidence obtained from transgenic mice; however, the underlying molecular pathways pertaining to the role of FTO in obesity have yet to be established. In this study, we investigate the Fto gene in mouse brown adipose tissue and in the browning process of white adipose tissue. We analyze distinct structural and molecular factors in brown and white fat depots of Fto-deficient mice under normal and obesogenic conditions...
November 7, 2016: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/27818937/depot-specific-differences-in-angiogenic-capacity-of-adipose-tissue-in-differential-susceptibility-to-diet-induced-obesity
#13
Mun-Gyu Song, Hye-Jin Lee, Bo-Yeong Jin, Ruth Gutierrez-Aguilar, Kyung-Ho Shin, Sang-Hyun Choi, Sung Hee Um, Dong-Hoon Kim
OBJECTIVE: Adipose tissue (AT) expansion requires AT remodeling, which depends on AT angiogenesis. Modulation of AT angiogenesis could have therapeutic promise for the treatment of obesity. However, it is unclear how the capacity of angiogenesis in each adipose depot is affected by over-nutrition. Therefore, we investigated the angiogenic capacity (AC) of subcutaneous and visceral fats in lean and obese mice. METHODS: We compared the AC of epididymal fat (EF) and inguinal fat (IF) using an angiogenesis assay in diet-induced obese (DIO) mice and diet-resistant (DR) mice fed a high-fat diet (HFD)...
November 2016: Molecular Metabolism
https://www.readbyqxmd.com/read/27818196/distinct-functions-of-ppar%C3%AE-isoforms-in-regulating-adipocyte-plasticity
#14
Dylan Li, Feng Zhang, Xuan Zhang, Chenyi Xue, Maria Namwanje, Lihong Fan, Muredach P Reilly, Fang Hu, Li Qiang
A better understanding of the mechanisms underlying obesity and its comorbidities is key to designing new therapies and treatments. PPARγ is a master regulator of adipocyte biology but the functions of its isoforms are poorly distinguished. Here we demonstrated that PPARγ1 is preferentially expressed in catabolic fat depots while PPARγ2 presents itself at a higher level in browning-resistant depots. PPARγ2, but not PPARγ1, responds to endogenous ligands to induce adipogenesis, and the isoforms regulate distinct sets of white and brown adipocyte genes...
December 2, 2016: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/27811141/a-glucocorticoid-and-diet-responsive-pathway-toggles-adipocyte-precursor-cell-activity-in-vivo
#15
Janica C Wong, Katherine C Krueger, Maria José Costa, Abhishek Aggarwal, Hongqing Du, Tracey L McLaughlin, Brian J Feldman
Obesity is driven by excess caloric intake, which leads to the expansion of adipose tissue by hypertrophy and hyperplasia. Adipose tissue hyperplasia results from the differentiation of adipocyte precursor cells (APCs) that reside in adipose depots. Investigation into this process has elucidated a network of mostly transcription factors that drive APCs through the differentiation process. Using in vitro and in vivo approaches, our study revealed a signaling pathway that inhibited the initiation of the adipocyte differentiation program...
October 25, 2016: Science Signaling
https://www.readbyqxmd.com/read/27802964/chronic-hyperprolactinemia-evoked-by-disruption-of-lactotrope-dopamine-d2-receptors-impacts-on-liver-and-adipocyte-genes-related-to-glucose-and-insulin-balance
#16
Guillermina Maria Luque, Felicitas Lopez-Vicchi, Ana Maria Ornstein, Belen Brie, Catalina De Winne, Esteban Fiore, Maria Ines Perez Millan, Guillermo Mazzolini, Marcelo Rubinstein, Damasia Becu-Villalobos
We studied the impact of high prolactin titers on liver and adipocyte gene expression related to glucose and insulin homeostasis, in correlation with obesity onset. To that end we used mutant female mice that selectively lack dopamine type 2 receptors (D2Rs) from pituitary lactotropes (lacDrd2KO) which have chronic high prolactin levels associated with increased body weight, marked increments in fat depots, adipocyte size, and serum lipids, a metabolic phenotype which intensifies with age. LacDrd2KO mice of two developmental ages, 5 and 10 months were used...
November 1, 2016: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/27802075/kinase-inactive-tyrosine-kinase-tyk2-supports-differentiation-of-brown-fat-cells
#17
Vidisha Raje, Marta Derecka, Marc Cantwell, Jeremy Meier, Karol Szczepanek, Jennifer D Sisler, Birgit Strobl, Ana Gamero, Thurl E Harris, Andrew C Larner
It has been known for decades that brown adipose tissue plays a central role in maintaining body temperature in hibernating animals, and human infants. Recently it has become evident that there are also depots of brown fat in adult humans, and the mass of brown fat is inversely correlated with body weight. There are a variety of transcription factors implicated in the differentiation of classical Myf5+ brown preadipocytes, one of the most important of which is PRDM16. We have recently identified that in addition to PRDM16, the tyrosine kinase Tyk2 and the STAT3 transcription factor are required for the differentiation of Myf5 positive brown preadipocytes both in cell culture and in mice...
November 1, 2016: Endocrinology
https://www.readbyqxmd.com/read/27782293/peroxisome-proliferator-activated-receptor-gamma-2-modulates-late-pregnancy-homeostatic-metabolic-adaptations
#18
Yurena Vivas, Monica Díez-Hochleitner, Adriana Izquierdo-Lahuerta, Patricia Corrales, Daniel Horrillo, Ismael Velasco, Cristina Martínez-García, Mark Campbell, Julio Sevillano, Mercedes Ricote, Manuel Ros, Maria Pilar Ramos, Gema Medina-Gomez
Pregnancy requires the adaptation of maternal energy metabolism including expansion and functional modifications of adipose tissue. Insulin resistance (IR), predominantly during late gestation, is a physiological metabolic adaptation that serves to support the metabolic demands of fetal growth. The molecular mechanisms underlying these adaptations are not fully understood and may contribute to gestational diabetes mellitus. Peroxisome proliferator-activated receptor gamma (PPARγ) controls adipogenesis, glucose and lipid metabolism and insulin sensitivity...
October 19, 2016: Molecular Medicine
https://www.readbyqxmd.com/read/27780820/activation-of-%C3%AE-3-adrenoceptors-increases-in-vivo-free-fatty-acid-uptake-and-utilization-in-brown-but-not-white-fat-depots-in-high-fat-fed-rats
#19
Amy Warner, Ann Kjellstedt, Alba Carreras, Gerhard Böttcher, Xiao-Rong Peng, Patrick Seale, Nicholas Oakes, Daniel Lindén
Activation of brown adipose tissue (BAT) and browning of white adipose tissue (WAT) present potential new therapies for obesity and type 2 diabetes. Here, we examined the effects of β3-adrenergic stimulation on tissue-specific uptake and storage of free fatty acids (FFA) and its implications for whole body FFA metabolism in diet-induced obese rats using a multi-radiotracer technique. Male Wistar rats were high fat-fed for 12 wk and administered β3-agonist CL316,243 (CL, 1 mg·kg(-1)·day(-1)) or saline via osmotic minipumps during the last 3 wk...
December 1, 2016: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/27775605/tocopherols-and-tocotrienols-in-common-and-emerging-dietary-sources-occurrence-applications-and-health-benefits
#20
Fereidoon Shahidi, Adriano Costa de Camargo
Edible oils are the major natural dietary sources of tocopherols and tocotrienols, collectively known as tocols. Plant foods with low lipid content usually have negligible quantities of tocols. However, seeds and other plant food processing by-products may serve as alternative sources of edible oils with considerable contents of tocopherols and tocotrienols. Tocopherols are among the most important lipid-soluble antioxidants in food as well as in human and animal tissues. Tocopherols are found in lipid-rich regions of cells (e...
October 20, 2016: International Journal of Molecular Sciences
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