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Muscle insulin resistance

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https://www.readbyqxmd.com/read/28327588/pharmacological-inhibition-of-adipose-triglyceride-lipase-corrects-high-fat-diet-induced-insulin-resistance-and-hepatosteatosis-in-mice
#1
Martina Schweiger, Matthias Romauch, Renate Schreiber, Gernot F Grabner, Sabrina Hütter, Petra Kotzbeck, Pia Benedikt, Thomas O Eichmann, Sohsuke Yamada, Oskar Knittelfelder, Clemens Diwoky, Carina Doler, Nicole Mayer, Werner De Cecco, Rolf Breinbauer, Robert Zimmermann, Rudolf Zechner
Elevated circulating fatty acids (FAs) contribute to the development of obesity-associated metabolic complications such as insulin resistance (IR) and non-alcoholic fatty liver disease (NAFLD). Hence, reducing adipose tissue lipolysis to diminish the mobilization of FAs and lower their respective plasma concentrations represents a potential treatment strategy to counteract obesity-associated disorders. Here we show that specific inhibition of adipose triglyceride lipase (Atgl) with the chemical inhibitor, Atglistatin, effectively reduces adipose tissue lipolysis, weight gain, IR and NAFLD in mice fed a high-fat diet...
March 22, 2017: Nature Communications
https://www.readbyqxmd.com/read/28324067/gestational-protein-restriction-impairs-glucose-disposal-in-the-gastrocnemius-muscles-of-female-rats
#2
C S Blesson, V Chinnathambi, S Kumar, C Yallampalli
Gestational low protein (LP) diet causes hyperglycemia and insulin resistance in adult offspring but the mechanism is not clearly understood. In this study, we explored the role of insulin signaling in gastrocnemius muscles of gestational LP exposed female offspring. Pregnant rats were fed control (20% protein) or isocaloric LP (6%) diet from gestational day 4 until delivery. Normal diet was given to mothers after delivery and to pups after weaning until necropsy. Offspring were euthanized at 4 months and gastrocnemius muscles were treated with insulin ex vivo for 30 min...
January 30, 2017: Endocrinology
https://www.readbyqxmd.com/read/28324055/substrate-metabolism-and-insulin-sensitivity-during-fasting-in-obese-human-subjects-impact-of-gh-blockade
#3
Morten Høgild Pedersen, Mads Vandsted Svart, Janne Lebeck, Martin Bidlingmaier, Hans Stødkilde-Jørgensen, Steen Bønløkke Pedersen, Niels Møller, Niels Jessen, Jens O L Jørgensen
Context: Insulin resistance and metabolic inflexibility are features of obesity and are amplified by fasting. GH secretion increases during fasting and GH causes insulin resistance. Objective: To study the metabolic effects of GH blockade during fasting in obese subjects. Subjects and Methods: Nine obese males were studied thrice in a randomized design: 1) After an overnight fast (Control), 2) After 72 h fasting (Fasting) and 3) After 72 h fasting with GH blockade (pegvisomant) (Fasting + GHA)...
January 18, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28323991/whole-body-vibration-mimics-the-metabolic-effects-of-exercise-in-male-leptin-receptor-deficient-mice
#4
Meghan E McGee-Lawrence, Karl H Wenger, Sudipta Misra, Catherine L Davis, Norman K Pollock, Mohammed Elsalanty, Kehong Ding, Carlos M Isales, Mark W Hamrick, Joanna R Erion, Marlena Wosiski-Kuhn, Phonepasong Arounleut, Mark P Mattson, Roy G Cutler, Jack C Yu, Alexis M Stranahan
Whole-body vibration has gained attention as a potential exercise mimetic, but direct comparisons with the metabolic effects of exercise are scarce. To determine whether whole-body vibration recapitulates the metabolic and osteogenic effects of physical activity, we exposed male wildtype (Wt) and leptin receptor deficient (db/db) mice to daily treadmill exercise or whole-body vibration for three months. Body weights were analyzed and compared with Wt and db/db mice that remained sedentary. Glucose and insulin tolerance testing revealed comparable attenuation of hyperglycemia and insulin resistance in db/db mice following treadmill exercise or whole-body vibration...
March 15, 2017: Endocrinology
https://www.readbyqxmd.com/read/28323978/assisted-reproductive-technologies-predispose-to-insulin-resistance-and-obesity-in-male-mice-challenged-with-a-high-fat-diet
#5
David Cerny, Claudio Sartori, Stefano F Rimoldi, Théo Meister, Rodrigo Soria, Elisa Bouillet, Urs Scherrer, Emrush Rexhaj
ART alters glucose homeostasis in mice and humans, but the underlying mechanisms are incompletely understood. ART induces endothelial dysfunction and arterial hypertension by epigenetic alteration of the eNOS gene. In eNOS deficient mice, insulin resistance is related to impaired insulin stimulation of muscle blood flow and substrate delivery and defective intrinsic skeletal muscle glucose uptake. We, therefore, assessed glucose tolerance, insulin sensitivity (euglycemic clamp), insulin stimulation of muscle blood flow in vivo and muscle glucose uptake in vitro in male ART and control mice fed a normal chow (NC) or challenged with a high fat diet (HFD) during 8 weeks...
February 8, 2017: Endocrinology
https://www.readbyqxmd.com/read/28323977/short-term-vs-long-term-effects-of-adipocyte-toll-like-receptor-4-activation-on-insulin-resistance-in-male-mice
#6
Caroline Tao, William L Holland, Qiong A Wang, Mengle Shao, Lin Jia, Kai Sun, Xiaoli Lin, Yi-Chun Kuo, Joshua A Johnson, Ruth Gordillo, Joel K Elmquist, Philipp E Scherer
Chronic exposure to diets high in saturated fat (HFD) increases the prevalence of obesity and contributes to the development of low-grade inflammation and insulin resistance. A possible mediator accounting for obesity-associated inflammation and insulin resistance is Toll-like receptor 4 (TLR4). We investigated the role of adipocyte TLR4 in lipid and glucose homeostasis through an inducible, adipocyte-specific deletion of TLR4, the "TADIPO mouse". Consistent with a critical role for inflammation as a positive force for healthy adipose tissue expansion, chronic HFD exposure resulted in exacerbated whole body and muscle insulin resistance in the absence of TLR4 in the adipocyte...
February 24, 2017: Endocrinology
https://www.readbyqxmd.com/read/28323975/muscle-sympathetic-nerve-activity-is-associated-with-elements-of-the-plasma-lipidomic-profile-in-young-asian-adults
#7
Nina Eikelis, Elisabeth A Lambert, Sarah Phillips, Carolina Ika Sari, Piyushkumar A Mundra, Jacquelyn M Weir, Kevin Huynh, Mariee T Grima, Nora E Straznicky, John B Dixon, Markus P Schlaich, Peter J Meikle, Gavin W Lambert
Background: Asian subjects are at increased cardio-metabolic risk at comparatively lower BMI compared with Caucasians. Sympathetic nervous system activation and dyslipidaemia, both characteristics of increased adiposity, appear to be related. We therefore analysed the association of muscle sympathetic nerve activity (MSNA) with the plasma lipidomic profile in young Asian and Caucasian subjects. Methods: Blood samples were collected from 101 participants of either Asian or Caucasian background, aged 18-30, BMI 28...
March 15, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28323973/how-to-measure-adipose-tissue-insulin-sensitivity
#8
Esben Søndergaard, Ana Elena Espinosa De Ycaza, Maria Morgan-Bathke, Michael D Jensen
Background: Adipose tissue insulin resistance may be a proximate cause of hepatic and skeletal muscle insulin resistance by releasing excess FFA. However, no consensus exists on how to quantify adipose tissue insulin sensitivity. We compared three methods for measuring adipose tissue insulin sensitivity ranging from the complex multistep pancreatic clamp technique to the simple adipose tissue insulin resistance index (Adipo-IR). Methods: We completed studies of 25 adults with a wide range of insulin sensitivity...
January 31, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28322789/high-glucose-impairs-insulin-signaling-via-activation-of-pkr-pathway-in-l6-muscle-cells
#9
Mary Priyanka Udumula, Mangali Suresh Babu, Audesh Bhat, Indu Dhar, Dharmarajan Sriram, Arti Dhar
Double stranded RNA (dsRNA) activated protein kinase R (PKR), a ubiquitously expressed serine/threonine kinase is a key inducer of inflammation, insulin resistance and glucose homeostasis in obesity. Recent studies have demonstrated that PKR can respond to metabolic stress in mice as well as in humans. However the underlying molecular mechanism is not fully understood. The aim of the present study was to examine the effect of high glucose on cultured rat L6 muscle cells and to investigate whether inhibition of PKR could prevent any deleterious effects of high glucose in these cells...
March 17, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28322786/adp-ribosylation-factor-like-gtpase-15-enhances-insulin-induced-akt-phosphorylation-in-the-ir-irs1-akt-pathway-by-interacting-with-asap2-and-regulating-pdpk1-activity
#10
Jie Zhao, Min Wang, Wuquan Deng, Daping Zhong, Youzhao Jiang, Yong Liao, Bing Chen, Xiaoli Zhang
Decreased phosphorylation in the insulin signalling pathway is a hallmark of insulin resistance. The causes of this phenomenon are complicated and multifactorial. Recently, genomic analyses have identified ARL15 as a new candidate gene related to diabetes. However, the ARL15 protein function remains unclear. Here, we show that ARL15 is upregulated by insulin stimulation. This effect was impaired in insulin-resistant pathophysiology in TNF-α-treated C2C12 myotubes and in the skeletal muscles of leptin knockout mice...
March 17, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28320096/a-natural-compound-jaceosidin-ameliorates-endoplasmic-reticulum-stress-and-insulin-resistance-via-upregulation-of-serca2b
#11
Zijun Ouyang, Wanshuai Li, Qianqian Meng, Qi Zhang, Xingqi Wang, Ahmed Elgehama, Xudong Wu, Yan Shen, Yang Sun, Xuefeng Wu, Qiang Xu
Increased endoplasmic reticulum (ER) stress has emerged as a vital contributor to dysregulated glucose homeostasis, and impaired function of sarco-endoplasmic reticulum Ca(2+)-ATPase 2b (SERCA2b) is one of the central mechanisms underlying ER stress. In this study, we reported that SERCA2b upregulation contributed to the amelioration of ER stress and insulin resistance by a small natural compound jaceosidin. In a model of differentiated C2C12 myotubes, jaceosidin-triggered SERCA2b upregulation enhanced insulin sensitivity and decreased ER stress...
March 17, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28320046/increased-insulin-resistance-and-glucagon-levels-in-mild-inactive-systemic-lupus-patients-despite-normal-glucose-tolerance
#12
Cíntia Nh Miyake, Bruno Gualano, Wagner S Dantas, Renato T Pereira, William Neves, Vanessa O Zambelli, Samuel K Shinjo, Rosa M Pereira, Elizabeth R Silva, Ana Lúcia Sá-Pinto, Eduardo Borba, Hamilton Roschel, Eloisa Bonfá, Fabiana B Benatti
OBJECTIVE: To assess insulin sensitivity in patients with systemic lupus erythematosus (SLE) in response to a meal tolerance test (MTT). METHODS: In this cross-sectional study, 33 adult females mild/inactive SLE and 16 age- and body mass index (BMI)-matched female healthy controls (CTRL) underwent a MTT and were assessed for insulin sensitivity and beta-cell function. Skeletal muscle protein expressions of total and membrane GLUT-4 were also evaluated (SLE, n=10; CTRL, n=5); muscle biopsies were performed after MTT...
March 20, 2017: Arthritis Care & Research
https://www.readbyqxmd.com/read/28318384/increased-adipose-and-muscle-insulin-sensitivity-without-changes-in-serum-adiponectin-in-young-female-collegiate-athletes
#13
Kaori Kitaoka, Mika Takeuchi, Ayaka Tsuboi, Satomi Minato, Miki Kurata, Shigehiro Tanaka, Tsutomu Kazumi, Keisuke Fukuo
BACKGROUND: Effects of endurance training on adipose insulin sensitivity in association with body composition, circulating adipokines, and markers of inflammation have been studied less in young Asian subjects. METHODS: Adipose insulin sensitivity/resistance was compared between 170 female Japanese collegiate athletes and 311 nonathletes (18-24 years), who underwent measurements of serum adipokines, markers of insulin sensitivity, inflammation, and dual-energy X-ray absorptiometry...
March 20, 2017: Metabolic Syndrome and related Disorders
https://www.readbyqxmd.com/read/28318372/white-blood-cell-counts-insulin-resistance-vitamin-d-levels-and-sarcopenia-in-korean-elderly-men
#14
Sang-Hwan Kim, Hyun Seok Kwon, Hee-Jin Hwang
Sarcopenia is a major determinant of frailty, disability and mortality in the elderly. Whether low-grade inflammation, insulin resistance and vitamin D are independently associated with sarcopenia remains unclear. In our study, sarcopenia was defined as an appendicular skeletal muscle mass divided by height squared (ASM/Ht(2)) that was <2 SD below the normal means for young adults. Insulin resistance was estimated using the homeostasis model assessment of insulin resistance (HOMA-IR) index [(insulin (IU/mL) × fasting glucose (mg/dL)/18)/22...
May 2017: Scandinavian Journal of Clinical and Laboratory Investigation
https://www.readbyqxmd.com/read/28317297/cardiometabolic-risk-factors-in-type-2-diabetes-with-high-fat-and-low-muscle-mass-at-baseline-and-in-response-to-exercise
#15
Tasuku Terada, Normand G Boulé, Mary Forhan, Carla M Prado, Glen P Kenny, Denis Prud'homme, Eiji Ito, Ronald J Sigal
OBJECTIVE: To examine the interplay between high fat and low muscle mass on cardiometabolic risk factors at baseline and in response to exercise in type 2 diabetes. METHODS: Using baseline percent body fat and skeletal muscle mass index, 248 participants were divided into high fat versus low fat and low muscle versus high muscle. Linear mixed models were used to examine the main effects of fat mass and muscle mass and their interaction on baseline cardiometabolic risk factors and changes in risk factors in response to 6-month exercise training...
March 20, 2017: Obesity
https://www.readbyqxmd.com/read/28316139/changes-in-body-composition-and-metabolic-profile-during-interleukin-6-inhibition-in-rheumatoid-arthritis
#16
Anne Tournadre, Bruno Pereira, Fréderic Dutheil, Charlotte Giraud, Daniel Courteix, Vincent Sapin, Thomas Frayssac, Sylvain Mathieu, Sandrine Malochet-Guinamand, Martin Soubrier
BACKGROUND: Rheumatoid arthritis (RA) is a chronic inflammatory disease characterized by increased mortality associated with cardiometabolic disorders including dyslipidaemia, insulin resistance, and cachectic obesity. Tumour necrosis factor inhibitors and interleukin 6 receptor blocker licensed for the treatment of RA decrease inflammation and could thus improve cardiovascular risk, but their effects on body composition and metabolic profile need to be clarified. We investigated the effects of tocilizumab (TCZ), a humanized anti-interleukin 6 receptor antibody, on body composition and metabolic profile in patients treated for RA...
March 18, 2017: Journal of Cachexia, Sarcopenia and Muscle
https://www.readbyqxmd.com/read/28315350/irisin-acts-as-a-regulator-of-macrophages-host-defense
#17
Agnieszka Irena Mazur-Bialy
AIM: Irisin, the adipomyokine, released mainly by exercised muscles, participate in the browning of adipose tissue and contribute to the restriction of insulin resistance and diabetes mellitus 2 development. Because of the limited reports describing the effect of irisin on inflammation and immunocompetent cells activation, the present study attempted to assess the influence of various irisin concentrations on basic macrophage activity. MAIN METHODS: Studies were carried out on murine RAW 264...
March 14, 2017: Life Sciences
https://www.readbyqxmd.com/read/28315335/microrna-99a-inhibits-insulin-induced-proliferation-migration-dedifferentiation-and-rapamycin-resistance-of-vascular-smooth-muscle-cells-by-inhibiting-insulin-like-growth-factor-1-receptor-and-mammalian-target-of-rapamycin
#18
Zi-Wei Zhang, Rui-Wei Guo, Jin-Lin Lv, Xian-Mei Wang, Jin-Shan Ye, Ni-Hong Lu, Xing Liang, Li-Xia Yang
Patients with type 2 diabetes mellitus (T2DM) are characterized by insulin resistance and are subsequently at high risk for atherosclerosis. Hyperinsulinemia has been associated with proliferation, migration, and dedifferentiation of vascular smooth muscle cells (VSMCs) during the pathogenesis of atherosclerosis. Moreover, insulin-like growth factor-1 receptor (IGF-1R) and mammalian target of rapamycin (mTOR) have been demonstrated to be the underlying signaling pathways. Recently, microRNA-99a (miR-99a) has been suggested to regulate the phenotypic changes of VSMCs in cancer cells...
March 15, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28300563/sestrin-2-induces-autophagy-and-attenuates-insulin-resistance-by-regulating-ampk-signaling-in-c2c12-myotubes
#19
Huige Li, Sujuan Liu, Hairui Yuan, Yanmei Niu, Li Fu
Impaired insulin-stimulated glucose uptake in skeletal muscle serves a critical role in the development of insulin resistance (IR), whereas the precise mechanism of the process remains unknown. Recently, the evolutionarily conserved, stress-inducible protein Sestrin2 (Sesn2) has been proposed to play a protective role against obesity-induced IR and diabetes. Activation of Sesn2 may activate AMP-activated protein kinase (AMPK) accompanied by suppression of mammalian target of rapamycin (mTOR), which may ultimately lead to autophagy induction...
March 12, 2017: Experimental Cell Research
https://www.readbyqxmd.com/read/28299976/leukocyte-telomere-length-is-inversely-associated-with-post-load-but-not-with-fasting-plasma-glucose-levels
#20
Mykola Khalangot, Dmytro Krasnienkov, Alexander Vaiserman, Ivan Avilov, Volodymir Kovtun, Nadia Okhrimenko, Alexander Koliada, Victor Kravchenko
Type 2 diabetes mellitus is characterized by shorter leukocyte telomere length, but the relationship between leukocyte telomere length and type 2 diabetes mellitus development is rather questioned. Fasting and post-load glycaemia associated with different types of insulin resistance and their relation with leukocyte telomere length remains unknown. We compared leukocyte telomere length and fasting or post-load glucose levels in persons who do not receive glucose lowering treatment. For 82 randomly selected rural residents of Ukraine, aged 45+, not previously diagnosed with type 2 diabetes mellitus, the WHO oral glucose tolerance test and anthropometric measurements were performed...
April 2017: Experimental Biology and Medicine
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