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Muscle insulin resistance

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https://www.readbyqxmd.com/read/28547918/exercise-with-weight-loss-improves-adipose-tissue-and-skeletal-muscle-markers-of-fatty-acid-metabolism-in-postmenopausal-women
#1
Heidi K Ortmeyer, Andrew P Goldberg, Alice S Ryan
OBJECTIVE: The effects of 6-month weight loss (WL) versus aerobic exercise training (AEX)+WL on fat and skeletal muscle markers of fatty acid metabolism were determined in normal (NGT) and impaired (IGT) glucose tolerant African-American and Caucasian postmenopausal women with overweight/obesity. METHODS: Fat (gluteal and abdominal) lipoprotein lipase (LPL), skeletal muscle LPL, acyl-CoA synthase (ACS), ß-hydroxacyl-CoA dehydrogenase, carnitine palmitoyltransferase (CPT-1), and citrate synthase (CS) activities were measured at baseline (n = 104) and before and after WL (n = 34) and AEX+WL (n = 37)...
May 26, 2017: Obesity
https://www.readbyqxmd.com/read/28545403/long-lasting-effect-of-obesity-on-skeletal-muscle-transcriptome
#2
Ilhem Messaoudi, Mithila Handu, Maham Rais, Suhas Sureshchandra, Byung S Park, Suzanne S Fei, Hollis Wright, Ashley E White, Ruhee Jain, Judy L Cameron, Kerri M Winters-Stone, Oleg Varlamov
BACKGROUND: Reduced physical activity and increased intake of calorically-dense diets are the main risk factors for obesity, glucose intolerance, and type 2 diabetes. Chronic overnutrition and hyperglycemia can alter gene expression, contributing to long-term obesity complications. While caloric restriction can reduce obesity and glucose intolerance, it is currently unknown whether it can effectively reprogram transcriptome to a pre-obesity level. The present study addressed this question by the preliminary examination of the transcriptional dynamics in skeletal muscle after exposure to overnutrition and following caloric restriction...
May 25, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28544394/muscle-metabolic-alterations-induced-by-genetic-ablation-of-4e-bp1-and-4e-bp2-in-response-to-diet-induced-obesity
#3
Olivier Le Bacquer, Kristell Combe, Christophe Montaurier, Jérôme Salles, Christophe Giraudet, Véronique Patrac, Carla Domingues-Faria, Christelle Guillet, Katie Louche, Yves Boirie, Nahum Sonenberg, Cédric Moro, Stéphane Walrand
SCOPE: In recent years, several studies reported the role of eIF4E-binding proteins (4E-BPs) on the development of diet-induced obesity and insulin resistance. Our aim was to investigate the effect of 4E-BP protein deletion on lipid accumulation and metabolism in skeletal muscle in response to a high fat diet-induced obesity in 4E-BP1/2 DKO mice. METHODS AND RESULTS: Diet-induced obesity engendered increased ectopic accumulation of lipotoxic species in skeletal muscle of 4E-BP1 and 4E-BP2 double-knockout mice (4E-BP1/2 DKO), namely diacylglycerols and ceramides...
May 21, 2017: Molecular Nutrition & Food Research
https://www.readbyqxmd.com/read/28544355/temporal-overexpression-of-sirt1-in-skeletal-muscle-of-adult-mice-does-not-improve-insulin-sensitivity-or-markers-of-mitochondrial-biogenesis
#4
Kristoffer Svensson, Samuel A LaBarge, Vitor F Martins, Simon Schenk
AIMS: Activation of the NAD(+) dependent protein deacetylase SIRT1 has been proposed as a therapeutic strategy to treat mitochondrial dysfunction and insulin resistance in skeletal muscle. However, life-long overexpression of SIRT1 in skeletal muscle does not improve parameters of mitochondrial function and insulin sensitivity. In this study we investigated whether temporal overexpression of SIRT1 in muscle of adult mice would affect skeletal muscle mitochondrial function and insulin sensitivity...
May 22, 2017: Acta Physiologica
https://www.readbyqxmd.com/read/28538106/intramuscular-triglyceride-content-precedes-impaired-glucose-metabolism-without-evidence-for-mitochondrial-dysfunction-during-early-development-of-a-diabetic-phenotype
#5
Zachary J Callahan, Michael James Oxendine, Paul J Schaeffer
The incidence of type 2 diabetes is highly correlated with obesity; however, there is a lack of research elucidating the temporal progression. Transgenic FVB/N UCP-dta mice, which develop a diabetic phenotype, and their non-transgenic littermates were fed either a high-fat or normal-chow diet and were studied at 6, 9, 12, 15, 18, 21, and 24 weeks of age in order to test the hypothesis that increased lipid accumulation in skeletal muscle causes mitochondrial dysfunction, leading to the development of insulin resistance...
May 24, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28531105/high-mobility-group-box-1-disrupts-metabolic-function-with-cigarette-smoke-exposure-in-a-ceramide-dependent-manner
#6
Oliver J Taylor, Mikayla O Thatcher, Sheryl T Carr, Jonathan L Gibbs, Annie M Trumbull, Mitchell E Harrison, Duane R Winden, Mackenzie J Pearson, Trevor S Tippetts, William L Holland, Paul R Reynolds, Benjamin T Bikman
We have previously found that cigarette smoke disrupts metabolic function, in part, by increasing muscle ceramide accrual. To further our understanding of this, we sought to determine the role of the cytokine high-mobility group box 1 (HMGB1), which is increased with smoke exposure, in smoke-induced muscle metabolic perturbations. To test this theory, we determined HMGB1 from lungs of human smokers, as well as from lung cells from mice exposed to cigarette smoke. We also treated cells and mice directly with HMGB1, in the presence or absence of myriocin, an inhibitor of serine palmitoyltransferase, the rate-limiting enzyme in ceramide biosynthesis...
May 20, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28529958/spatiotemporal-regulators-for-insulin-stimulated-glut4-vesicle-exocytosis
#7
REVIEW
Xiaoxu Zhou, Ping Shentu, Yingke Xu
Insulin increases glucose uptake and storage in muscle and adipose cells, which is accomplished through the mobilization of intracellular GLUT4 storage vesicles (GSVs) to the cell surface upon stimulation. Importantly, the dysfunction of insulin-regulated GLUT4 trafficking is strongly linked with peripheral insulin resistance and type 2 diabetes in human. The insulin signaling pathway, key signaling molecules involved, and precise trafficking itinerary of GSVs are largely identified. Understanding the interaction between insulin signaling molecules and key regulatory proteins that are involved in spatiotemporal regulation of GLUT4 vesicle exocytosis is of great importance to explain the pathogenesis of diabetes and may provide new potential therapeutic targets...
2017: Journal of Diabetes Research
https://www.readbyqxmd.com/read/28529490/microgravity-induced-transcriptome-adaptation-in-mouse-paraspinal-longissimus-dorsi-muscle-highlights-insulin-resistance-linked-genes
#8
Guido Gambara, Michele Salanova, Stefano Ciciliot, Sandra Furlan, Martina Gutsmann, Gudrun Schiffl, Ute Ungethuem, Pompeo Volpe, Hanns-Christian Gunga, Dieter Blottner
Microgravity as well as chronic muscle disuse are two causes of low back pain originated at least in part from paraspinal muscle deconditioning. At present no study investigated the complexity of the molecular changes in human or mouse paraspinal muscles exposed to microgravity. The aim of this study was to evaluate longissimus dorsi adaptation to microgravity at both morphological and global gene expression level. C57BL/N6 male mice were flown aboard the BION-M1 biosatellite for 30 days (BF) or housed in a replicate flight habitat on ground (BG)...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28529179/mitochondria-and-endoplasmic-reticulum-targets-for-a-better-insulin-sensitivity-in-skeletal-muscle
#9
REVIEW
Alexis Boulinguiez, Bart Staels, Helene Duez, Steve Lancel
Obesity and its associated metabolic disorders represent a major health burden, with economic and social consequences. Although adapted lifestyle and bariatric surgery are effective in reducing body weight, obesity prevalence is still rising. Obese individuals often become insulin-resistant. Obesity impacts on insulin responsive organs, such as the liver, adipose tissue and skeletal muscle, and increases the risk of cardiovascular diseases, type 2 diabetes and cancer. In this review, we discuss the effects of obesity and insulin resistance on skeletal muscle, an important organ for the control of postprandial glucose...
May 18, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28528355/increased-retinol-free-rbp4-contributes-to-insulin-resistance-in-gestational-diabetes-mellitus
#10
Yanmin Chen, Ping Lv, Mengkai Du, Zhaoxia Liang, Menglin Zhou, Danqing Chen
PURPOSE: Retinol-binding protein 4 (RBP4) is a circulating retinol transporter that is strongly associated with insulin resistance. The aim of this study was to evaluate the RBP4 and retinol level in rat model of gestational diabetes mellitus and the relationship between retinol-free RBP4 (apo-RBP4), retinol-bound RBP4 (holo-RBP4) and insulin resistance. METHODS: Pregnant rats were administered streptozotocin to induce diabetes. The RBP4 and retinol levels were evaluated in GDM and normal pregnant rats...
May 20, 2017: Archives of Gynecology and Obstetrics
https://www.readbyqxmd.com/read/28526870/time-course-responses-of-circulating-micrornas-to-three-resistance-training-protocols-in-healthy-young-men
#11
Shufang Cui, Biao Sun, Xin Yin, Xia Guo, Dingming Chao, Chunni Zhang, Chen-Yu Zhang, Xi Chen, Jizheng Ma
Circulating microRNAs (c-miRNAs) in human plasma have been described as a potential marker of exercise. The present study investigated the effects of three acute resistance training (RT) protocols on the time-course changes of the c-miRNAs profiles in young males. The subjects (n = 45) were randomly divided into three groups: muscular strength endurance (SE), muscular hypertrophy (MH) and maximum strength (MS). Venous blood samples were obtained before exercise and immediately, 1 h and 24 h after each RT protocol to assess the following biological parameters: c-miRNAs, anabolic and catabolic hormones, inflammatory cytokines and muscle damage markers...
May 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28526321/effects-of-dehp-and-its-metabolite-mehp-on-insulin-signalling-and-proteins-involved-in-glut4-translocation-in-cultured-l6-myotubes
#12
Mangala Priya Viswanathan, Vigneswari Mullainadhan, Mayilvanan Chinnaiyan, Balasubramanian Karundevi
Di-(2-ethylhexyl)phthalate (DEHP) is the plasticizer used in variety of medical and consumer products to impart structural flexibility. DEHP and its primary metabolite mono-(2-ethyl hexyl)phthalate (MEHP) posed a considerable interest because of their contribution to insulin resistance, type-2 diabetes and obesity. Experimental and epidemiological data have shown that DEHP affects blood glucose homeostasis. However, direct effect of DEHP and its metabolite MEHP on insulin signal transduction and glucose transporter 4 (GLUT4) translocation remain obscure...
May 16, 2017: Toxicology
https://www.readbyqxmd.com/read/28522731/effect-of-metformin-on-bioactive-lipid-metabolism-in-insulin-resistant-muscle
#13
Piotr Zabielski, Marta Chacinska, Karol Charkiewicz, Marcin Baranowski, Jan Gorski, Agnieszka U Blachnio-Zabielska
Intramuscular accumulation of bioactive lipids leads to insulin resistance and type 2 diabetes (T2D). There is lack of consensus concerning which of the lipid mediators has the greatest impact on muscle insulin action in vivo Our aim was to elucidate the effects of high-fat diet (HFD) and metformin (Met) on skeletal muscle bioactive lipid accumulation and insulin resistance (IR) in rats. We employed a [U-(13)C]palmitate isotope tracer and mass spectrometry to measure the content and fractional synthesis rate (FSR) of intramuscular long-chain acyl-CoA (LCACoA), diacylglycerols (DAG) and ceramide (Cer)...
June 2017: Journal of Endocrinology
https://www.readbyqxmd.com/read/28516213/expression-of-concern-aspirin-attenuates-insulin-resistance-in-muscle-of-diet-induced-obese-rats-by-inhibiting-inducible-nitric-oxide-synthase-production-and-s-nitrosylation-of-ir%C3%AE-irs-1-and-akt
#14
M A Carvalho-Filho, E R Ropelle, R J Pauli, D E Cintra, D M L Tsukumo, L R Silveira, R Curi, J B C Carvalheira, L A Velloso, M J A Saad
No abstract text is available yet for this article.
May 17, 2017: Diabetologia
https://www.readbyqxmd.com/read/28515340/turning-back-the-clock
#15
Ashley H Shoemaker
Increased DNA breaks in aging skeletal muscle activate the DNA-PK pathway, whereas blocking this pathway improves mitochondrial density, physical fitness, body weight, and insulin resistance in mice.
May 17, 2017: Science Translational Medicine
https://www.readbyqxmd.com/read/28515080/effect-of-resistance-exercise-under-conditions-of-reduced-blood-insulin-on-ampk%C3%AE-ser485-491-inhibitory-phosphorylation-and-ampk-pathway-activation
#16
Kohei Kido, Takumi Yokokawa, Satoru Ato, Koji Sato, Satoshi Fujita
Insulin stimulates skeletal muscle glucose uptake via activation of the protein kinase B/Akt (Akt) pathway. Recent studies suggest that insulin down-regulates AMP-activated protein kinase (AMPK) activity via Ser485/491 phosphorylation of the AMPK α-subunit. Thus, lower blood insulin concentrations may induce AMPK signal activation. Acute exercise is one method to stimulate AMPK activation; however, no study has examined the relationship between blood insulin levels and acute resistance exercise-induced AMPK pathway activation...
May 17, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/28507343/non-alcoholic-fatty-liver-disease-vascular-inflammation-and-insulin-resistance-are-exacerbated-by-trail-deletion-in-mice
#17
Siân P Cartland, Hanis H Harith, Scott W Genner, Lei Dang, Victoria C Cogger, Melissa Vellozzi, Belinda A Di Bartolo, Shane R Thomas, Leon A Adams, Mary M Kavurma
Non-alcoholic fatty liver disease (NAFLD) incorporates steatosis, non-alcoholic steato-hepatitis (NASH) and liver cirrhosis, associating with diabetes and cardiovascular disease (CVD). TNF-related apoptosis-inducing ligand (TRAIL) is protective of CVD. We aimed to determine whether TRAIL protects against insulin resistance, NAFLD and vascular injury. Twelve-week high fat diet (HFD)-fed Trail (-/-) mice had increased plasma cholesterol, insulin and glucose compared to wildtype. Insulin tolerance was impaired with TRAIL-deletion, with reduced p-Akt, GLUT4 expression and glucose uptake in skeletal muscle...
May 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28505476/gender-difference-in-the-association-between-lower-muscle-mass-and-metabolic-syndrome-independent-of-insulin-resistance-in-a-middle-aged-and-elderly-taiwanese-population
#18
You-Ci Ou, Hai-Hua Chuang, Wen-Cheng Li, I-Shiang Tzeng, Jau-Yuan Chen
BACKGROUND: Loss of muscle mass was reported to be associated with metabolic syndrome (MetS), but little is known about the gender difference. Thus, the aim of this study was to evaluate the relationship between lower muscle mass and MetS and determine whether there was any gender difference or not. METHODS: A total of 394 middle-aged and elderly Taiwanese adults (138 males and 256 females) were enrolled and completed our health survey. They were stratified into three groups according to appendicular skeletal muscle mass divided by weight...
May 8, 2017: Archives of Gerontology and Geriatrics
https://www.readbyqxmd.com/read/28503098/absence-of-4-1bb-reduces-obesity-induced-atrophic-response-in-skeletal-muscle
#19
Ngoc Hoan Le, Chu-Sook Kim, Thai Hien Tu, Byung-Sam Kim, Taesun Park, Jung Han Yoon Park, Tsuyoshi Goto, Teruo Kawada, Tae Youl Ha, Rina Yu
Obesity-induced inflammation causes skeletal muscle atrophy accompanied by disruption of oxidative metabolism and is implicated in metabolic complications such as insulin resistance and type 2 diabetes. We previously reported that 4-1BB, a member of the tumor necrosis factor receptor superfamily, participated in obesity-induced skeletal muscle inflammation. Here, we show that the absence of 4-1BB in obese mice fed a high-fat diet led to a decrease in expression of atrophic factors (MuRF1 and Atrogin-1) with suppression of NF-κB activity, and that this was accompanied by increases in mitochondrial oxidative metabolic genes/proteins (e...
2017: Journal of Inflammation
https://www.readbyqxmd.com/read/28501806/exercise-in-type-2-diabetes-genetic-metabolic-and-neuromuscular-adaptations-a-review-of-the-evidence
#20
REVIEW
Silvano Zanuso, Massimo Sacchetti, Carl Johan Sundberg, Giorgio Orlando, Paolo Benvenuti, Stefano Balducci
The biological responses to exercise training are complex, as almost all organs and systems are involved in interactions that result in a plethora of adaptations at the genetic, metabolic and neuromuscular levels.To provide the general practitioner and the sports medicine professionals with a basic understanding of the genetic, metabolic and neuromuscular adaptations at a cellular level that occur with aerobic and resistance exercise in subjects with type 2 diabetes.For each of the three domains (genetic, metabolic and neuromuscular), the results of the major systematic reviews and original research published in relevant journals, indexed in PubMed, were selected...
May 13, 2017: British Journal of Sports Medicine
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