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Obesity and genes

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https://www.readbyqxmd.com/read/27909723/inhibition-of-jnk-suppresses-autophagy-and-attenuates-insulin-resistance-in-a-rat-model-of-nonalcoholic-fatty-liver-disease
#1
Hua Yan, Yanqiong Gao, Ying Zhang
Nonalcoholic fatty liver disease (NAFLD) is a common chronic liver disease, the pathological process of which is complex. Activation of the c‑Jun N‑terminal kinase (JNK) signaling pathway is associated with the mechanism underlying obesity-induced insulin resistance. Furthermore, the JNK signaling pathway and dysfunctional autophagy serve important roles in hepatic lipid metabolism. However, the exact role of JNK in autophagy and obesity‑induced insulin resistance is not fully understood. Therefore, the present study aimed to investigate the underlying mechanisms by which the JNK signaling pathway regulates autophagy and insulin resistance in fatty liver...
November 24, 2016: Molecular Medicine Reports
https://www.readbyqxmd.com/read/27909699/aav-mediated-sirt1-overexpression-in-skeletal-muscle-activates-oxidative-capacity-but-does-not-prevent-insulin-resistance
#2
Laia Vilà, Carles Roca, Ivet Elias, Alba Casellas, Ricardo Lage, Sylvie Franckhauser, Fatima Bosch
Type 2 diabetes is characterized by triglyceride accumulation and reduced lipid oxidation capacity in skeletal muscle. SIRT1 is a key protein in the regulation of lipid oxidation and its expression is reduced in the skeletal muscle of insulin resistant mice. In this tissue, Sirt1 up-regulates the expression of genes involved in oxidative metabolism and improves mitochondrial function mainly through PPARGC1 deacetylation. Here we examined whether Sirt1 overexpression mediated by adeno-associated viral vectors of serotype 1 (AAV1) specifically in skeletal muscle can counteract the development of insulin resistance induced by a high fat diet in mice...
2016: Molecular Therapy. Methods & Clinical Development
https://www.readbyqxmd.com/read/27909561/korean-solar-salts-reduce-obesity-and-alter-its-related-markers-in-diet-induced-obese-mice
#3
Jaehyun Ju, Jia-Le Song, Eui-Seong Park, Myoung-Sool Do, Kun-Young Park
BACKGROUND/OBJECTIVES: The aim of this experiments was to show anti-obesity effects of Korean solar salt from different salt fields in diet-induced obese mice. SUBJECTS/METHODS: Diet-induced obesity (DIO) was induced by a high-fat diet (HFD; 45% cal from fat) in C57BL/6J mice for eight weeks. The mice were fed with the designated diets (chow diet for Normal, HFD for Control, 0.47%-salt-mixed HFD for purified salt (PS), Guerande solar salt from France (SS-G), solar salt from Y salt field (SS-Y), solar salts from T salt field (SS-T) and S salt field (SS-S)) for another eight weeks...
December 2016: Nutrition Research and Practice
https://www.readbyqxmd.com/read/27909560/induction-of-heme-oxygenase-1-with-dietary-quercetin-reduces-obesity-induced-hepatic-inflammation-through-macrophage-phenotype-switching
#4
Chu-Sook Kim, Hye-Seon Choi, Yeonsoo Joe, Hun Taeg Chung, Rina Yu
BACKGROUND/OBJECTIVES: Obesity-induced steatohepatitis accompanied by activated hepatic macrophages/Kupffer cells facilitates the progression of hepatic fibrinogenesis and exacerbates metabolic derangements such as insulin resistance. Heme oxyganase-1 (HO-1) modulates tissue macrophage phenotypes and thus is implicated in protection against inflammatory diseases. Here, we show that the flavonoid quercetin reduces obesity-induced hepatic inflammation by inducing HO-1, which promotes hepatic macrophage polarization in favor of the M2 phenotype...
December 2016: Nutrition Research and Practice
https://www.readbyqxmd.com/read/27909015/diabetic-human-adipose-tissue-derived-mesenchymal-stem-cells-fail-to-differentiate-in-functional-adipocytes
#5
Ignazio Barbagallo, Giovanni Li Volti, Fabio Galvano, Guido Tettamanti, Francesca R Pluchinotta, Sonia Bergante, Luca Vanella
Adipose tissue dysfunction represents a hallmark of diabetic patients and is a consequence of the altered homeostasis of this tissue. Mesenchymal stem cells (MSCs) and their differentiation into adipocytes contribute significantly in maintaining the mass and function of adult adipose tissue. The aim of this study was to evaluate the differentiation of MSCs from patients suffering type 2 diabetes (dASC) and how such process results in hyperplasia or rather a stop of adipocyte turnover resulting in hypertrophy of mature adipocytes...
November 30, 2016: Experimental Biology and Medicine
https://www.readbyqxmd.com/read/27908418/lead-pb-exposure-promotes-diabetes-in-obese-rodents
#6
Jannifer B Tyrrell, Samar Hafida, Paul Stemmer, Angie Adhami, Todd Leff
BACKGROUND: Pb (lead) exposure occurs at elevated frequency in urban inner city populations that also have high rates of obesity and diabetes. OBJECTIVES: To determine if Pb can promote the development of diabetes in a setting of obesity, we examined the effect of Pb exposure on glucose metabolism in a rodent model of obesity. METHODS: Adult female ZDF rats were exposed to Pb in drinking water for 24 weeks. Fasting blood glucose, insulin, and glucose tolerance were measured at regular intervals...
January 2017: Journal of Trace Elements in Medicine and Biology
https://www.readbyqxmd.com/read/27908299/the-infrapatellar-fat-pad-induces-inflammatory-and-degradative-effects-in-articular-cells-but-not-through-leptin-or-adiponectin
#7
Jean-Baptiste Gross, Cecile Guillaume, Pascale Gegout-Pottie, Pascal Reboul, Jean-Yves Jouzeau, Didier Mainard, Nathalie Presle
OBJECTIVES: Based on a novel approach suggesting a role of adipose tissue in osteoarthritis (OA), we aimed to determine whether the infrapatellar fat pad (IFP) may affect joint cell functions through adipokines. METHODS: The conditioned media of IFP and subcutaneous adipose tissue from OA patients were used to determine the production of leptin and adiponectin, and to stimulate chondrocytes and fibroblast-like synoviocytes (FLS). Blocking experiments were carried out to evaluate the contribution of adipokines to IFP effects...
November 13, 2016: Clinical and Experimental Rheumatology
https://www.readbyqxmd.com/read/27907930/microrna-profiling-in-clear-cell-renal-cell-carcinoma-tissues-potentially-links-tumorigenesis-and-recurrence-with-obesity
#8
X Shu, M A Hildebrandt, J Gu, N M Tannir, S F Matin, J A Karam, C G Wood, X Wu
BACKGROUND: Twenty to 40% localised RCC patients may experience recurrence after curative surgery. Limited miRNA predictors have been identified for ccRCC recurrence. METHODS: Through a multi-phase study design, we analysed miRNAs in tissues obtained from 203 ccRCC patients. Paired t-test was used for tumour-normal comparisons and Cox regression model was performed to compute hazard ratios (HRs) and corresponding 95% CIs. RESULTS: A 17-miRNA signature was identified that can concordantly classify >95% of tumour/adjacent normal samples...
December 1, 2016: British Journal of Cancer
https://www.readbyqxmd.com/read/27907186/inter-tissue-gene-co-expression-networks-between-metabolically-healthy-and-unhealthy-obese-individuals
#9
Lisette J A Kogelman, Jingyuan Fu, Lude Franke, Jan Willem Greve, Marten Hofker, Sander S Rensen, Haja N Kadarmideen
BACKGROUND: Obesity is associated with severe co-morbidities such as type 2 diabetes and nonalcoholic steatohepatitis. However, studies have shown that 10-25 percent of the severely obese individuals are metabolically healthy. To date, the identification of genetic factors underlying the metabolically healthy obese (MHO) state is limited. Systems genetics approaches have led to the identification of genes and pathways in complex diseases. Here, we have used such approaches across tissues to detect genes and pathways involved in obesity-induced disease development...
2016: PloS One
https://www.readbyqxmd.com/read/27907092/unconjugated-bile-acids-influence-expression-of-circadian-genes-a-potential-mechanism-for-microbe-host-crosstalk
#10
Kalaimathi Govindarajan, John MacSharry, Patrick G Casey, Fergus Shanahan, Susan A Joyce, Cormac G M Gahan
Disruptions to circadian rhythm in mice and humans have been associated with an increased risk of obesity and metabolic syndrome. The gut microbiota is known to be essential for the maintenance of circadian rhythm in the host suggesting a role for microbe-host interactions in the regulation of the peripheral circadian clock. Previous work suggested a role for gut bacterial bile salt hydrolase (BSH) activity in the regulation of host circadian gene expression. Here we demonstrate that unconjugated bile acids, known to be generated through the BSH activity of the gut microbiota, are potentially chronobiological regulators of host circadian gene expression...
2016: PloS One
https://www.readbyqxmd.com/read/27906547/late-diagnosis-of-pomc-deficiency-and-in-vitro-evidence-of-residual-translation-from-allele-with-c-11c-a-mutation
#11
Aleksandra S Anisimova, Petr M Rubtsov, Kseniya A Akulich, Sergey E Dmitriev, Elena Frolova, Anatoly Tiulpakov
CONTEXT: Loss-of-function mutations in the POMC gene are associated with the syndrome of adrenal insufficiency, obesity and red hair. We describe here a case of POMC deficiency, in which adrenal insufficiency was not treated until the fourth year of life. One of the disease-causative POMC mutations was characterized in vitro using a new approach. CASE DESCRIPTION: A boy presented in the first year of life with red hair, growth acceleration, moderate obesity and recurrent cholestasis, which was followed by two episodes of hypoglycemia at ages of 1...
December 1, 2016: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/27906092/alterations-to-mtorc1-signaling-in-the-skeletal-muscle-differentially-affect-whole-body-metabolism
#12
Maitea Guridi, Barbara Kupr, Klaas Romanino, Shuo Lin, Denis Falcetta, Lionel Tintignac, Markus A Rüegg
BACKGROUND: The mammalian target of rapamycin complex 1 (mTORC1) is a central node in a network of signaling pathways controlling cell growth and survival. This multiprotein complex integrates external signals and affects different nutrient pathways in various organs. However, it is not clear how alterations of mTORC1 signaling in skeletal muscle affect whole-body metabolism. RESULTS: We characterized the metabolic phenotype of young and old raptor muscle knock-out (RAmKO) and TSC1 muscle knock-out (TSCmKO) mice, where mTORC1 activity in skeletal muscle is inhibited or constitutively activated, respectively...
March 21, 2016: Skeletal Muscle
https://www.readbyqxmd.com/read/27904521/epigenetic-modifications-in-adipose-tissue-relation-to-obesity-and-diabetes
#13
Marta A Kasinska, Jozef Drzewoski, Agnieszka Sliwinska
The growing number of people suffering from obesity and type 2 diabetes mellitus (T2DM) is a global health problem that results in increased mortality from their complications, mainly cardiovascular diseases. Although the relationship between obesity and T2DM is well established, the common molecular pathomechanisms are still under investigation. Recently, it has been suggested that epigenetic modifications may be involved in both obesity and T2DM development. Epigenetics plays a pivotal role in the regulation of gene expression by the reversible modifications of chromatin structure without any changes in DNA sequence...
December 1, 2016: Archives of Medical Science: AMS
https://www.readbyqxmd.com/read/27903298/meal-rich-in-carbohydrate-but-not-protein-or-fat-reveals-adverse-immunometabolic-responses-associated-with-obesity
#14
Ehsan Parvaresh Rizi, Sonia Baig, Muhammad Shabeer, Yvonne Teo, Shao Feng Mok, Tze Ping Loh, Faidon Magkos, Sam Virtue, Antonio Vidal-Puig, E Shyong Tai, Chin Meng Khoo, Sue-Anne Toh
BACKGROUND: Obesity-related insulin resistance is linked to inflammation. Immunometabolic function differs between lean and obese subjects, but whether macronutrient composition of ingested meals affects these responses is not well known. We examined the effects of a single meal rich in fat, protein, or carbohydrate on immunometabolic responses. METHODS: Nine lean insulin sensitive (LIS) men and 9 obese insulin resistant (OIR) men ingested high-carbohydrate (HC), high-fat (HF) or high-protein (HP) mixed meals in random order...
December 1, 2016: Nutrition Journal
https://www.readbyqxmd.com/read/27902747/joint-profiling-of-mirnas-and-mrnas-reveals-mirna-mediated-gene-regulation-in-the-g%C3%A3-ttingen-minipig-obesity-model
#15
Caroline M Junker Mentzel, Ferhat Alkan, Helle Keinicke, Mette J Jacobsen, Jan Gorodkin, Merete Fredholm, Susanna Cirera
Obesity and its comorbidities are an increasing challenge for both affected individuals and health care systems, worldwide. In obese individuals, perturbation of expression of both protein-coding genes and microRNAs (miRNA) are seen in obesity-relevant tissues (i.e. adipose tissue, liver and skeletal muscle). miRNAs are small non-coding RNA molecules which have important regulatory roles in a wide range of biological processes, including obesity. Rodents are widely used animal models for human diseases including obesity...
2016: PloS One
https://www.readbyqxmd.com/read/27901601/activation-of-estrogen-response-element-independent-er%C3%AE-signaling-protects-female-mice-from-diet-induced-obesity
#16
Ali Yasrebi, Janelle A Rivera, Elizabeth A Krumm, Jennifer A Yang, Troy A Roepke
17β-estradiol (E2) regulates central and peripheral mechanisms that control energy and glucose homeostasis predominantly through estrogen receptor α (ERα) acting via receptor binding to estrogen response elements (ERE). ERα signaling is also involved in mediating the effects of E2 on diet-induced obesity (DIO), although the roles of ERE-dependent and -independent ERα signaling in ameliorating the effects of DIO remain largely unknown. We hypothesize that ERE-dependent ERα signaling is necessary to ameliorate the effects of DIO...
November 30, 2016: Endocrinology
https://www.readbyqxmd.com/read/27900559/upregulated-tnf-expression-1%C3%A2-year-after-bariatric-surgery-reflects-a-cachexia-like-state-in-subcutaneous-adipose-tissue
#17
Alexander Jürets, Bianca Karla Itariu, Magdalena Keindl, Gerhard Prager, Felix Langer, Viktor Grablowitz, Maximilian Zeyda, Thomas Michael Stulnig
BACKGROUND: Adipose tissue dysfunction contributes to obesity-associated chronic diseases. In the first year after bariatric surgery, obese patients significantly improve their metabolic status upon losing weight. We aimed to investigate whether changes in subcutaneous adipose tissue gene expression reflect a restoration of a healthy lean phenotype after bariatric surgery. METHODS: Thirty-one severely obese patients (BMI ≥ 40 kg/m(2)) were examined before and after surgery...
November 29, 2016: Obesity Surgery
https://www.readbyqxmd.com/read/27900263/islet-chrebp-%C3%AE-is-increased-in-diabetes-and-controls-chrebp-%C3%AE-and-glucose-induced-gene-expression-via-a-negative-feedback-loop
#18
Gu Jing, Junqin Chen, Guanlan Xu, Anath Shalev
OBJECTIVE: Carbohydrate-response element-binding protein (ChREBP) is the major transcription factor conferring glucose-induced gene expression in pancreatic islets, liver and adipose tissue. Recently, a novel ChREBP isoform, ChREBP-β, was identified in adipose tissue and found to be also expressed in islets and involved in glucose-induced beta cell proliferation. However, the physiological function of this less abundant β-isoform in the islet, and in diabetes, is largely unknown. The aims of the present study, therefore, were to determine how diabetes affects ChREBP-β and elucidate its physiological role in pancreatic beta cells...
December 2016: Molecular Metabolism
https://www.readbyqxmd.com/read/27900262/impaired-histone-deacetylases-5-and-6-expression-mimics-the-effects-of-obesity-and-hypoxia-on-adipocyte-function
#19
Julien Bricambert, Dimitri Favre, Saška Brajkovic, Amélie Bonnefond, Raphael Boutry, Roberto Salvi, Valérie Plaisance, Mohamed Chikri, Giulia Chinetti-Gbaguidi, Bart Staels, Vittorio Giusti, Robert Caiazzo, François Pattou, Gérard Waeber, Philippe Froguel, Amar Abderrahmani
OBJECTIVE: The goal of the study was to investigate the role of histone deacetylases (HDACs) in adipocyte function associated with obesity and hypoxia. METHODS: Total proteins and RNA were prepared from human visceral adipose tissues (VAT) of human obese and normal weight subjects and from white adipose tissue (WAT) of C57Bl6-Rj mice fed a normal or high fat diet (HFD) for 16 weeks. HDAC activity was measured by colorimetric assay whereas the gene and protein expression were monitored by real-time PCR and by western blotting, respectively...
December 2016: Molecular Metabolism
https://www.readbyqxmd.com/read/27900259/dietary-fat-and-gut-microbiota-interactions-determine-diet-induced-obesity-in-mice
#20
Raphaela Kübeck, Catalina Bonet-Ripoll, Christina Hoffmann, Alesia Walker, Veronika Maria Müller, Valentina Luise Schüppel, Ilias Lagkouvardos, Birgit Scholz, Karl-Heinz Engel, Hannelore Daniel, Philippe Schmitt-Kopplin, Dirk Haller, Thomas Clavel, Martin Klingenspor
OBJECTIVE: Gut microbiota may promote positive energy balance; however, germfree mice can be either resistant or susceptible to diet-induced obesity (DIO) depending on the type of dietary intervention. We here sought to identify the dietary constituents that determine the susceptibility to body fat accretion in germfree (GF) mice. METHODS: GF and specific pathogen free (SPF) male C57BL/6N mice were fed high-fat diets either based on lard or palm oil for 4 wks. Mice were metabolically characterized at the end of the feeding trial...
December 2016: Molecular Metabolism
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