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Muscle insulin resistance

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https://www.readbyqxmd.com/read/28443029/superior-effects-of-eccentric-to-concentric-knee-extensor-resistance-training-on-physical-fitness-insulin-sensitivity-and-lipid-profiles-of-elderly-men
#1
Trevor Chung-Ching Chen, Wei-Chin Tseng, Guan-Ling Huang, Hsin-Lian Chen, Kuo-Wei Tseng, Kazunori Nosaka
It has been reported that eccentric training of knee extensors is effective for improving blood insulin sensitivity and lipid profiles to a greater extent than concentric training in young women. However, it is not known whether this is also the case for elderly individuals. Thus, the present study tested the hypothesis that eccentric training of the knee extensors would improve physical function and health parameters (e.g., blood lipid profiles) of older adults better than concentric training. Healthy elderly men (60-76 years) were assigned to either eccentric training or concentric training group (n = 13/group), and performed 30-60 eccentric or concentric contractions of knee extensors once a week...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28439848/the-janus-head-of-oxidative-stress-in-metabolic-diseases-and-during-physical-exercise
#2
REVIEW
Dominik Pesta, Michael Roden
PURPOSE OF REVIEW: Oxidative stress describes an imbalance between production and degradation of reactive oxygen species (ROS), which can damage macromolecules. However, ROS may also serve as signaling molecules activating cellular pathways involved in cell proliferation and adaptation. This review describes alterations in metabolic diseases including obesity, insulin resistance, and/or diabetes mellitus as well as responses to acute and chronic physical exercise. RECENT FINDINGS: Chronic upregulation of oxidative stress associates with the development of insulin resistance and type 2 diabetes (T2D)...
June 2017: Current Diabetes Reports
https://www.readbyqxmd.com/read/28439217/pediatric-metabolic-syndrome-pathophysiology-and-laboratory-assessment
#3
Victoria Higgins, Khosrow Adeli
Pediatric overweight and obesity is an emerging public health priority as rates have rapidly increased worldwide. Obesity is often clustered with other metabolic abnormalities including hypertension, dyslipidemia, and insulin resistance, leading to increased risk of cardiovascular disease. This cluster of risk factors, termed the metabolic syndrome, has traditionally been reported in adults. However, with the increased prevalence of pediatric obesity, the metabolic syndrome is now evident in children and adolescents...
March 2017: EJIFCC
https://www.readbyqxmd.com/read/28437447/carbonic-anhydrase-iii-car3-is-not-required-for-fatty-acid-synthesis-and-does-not-protect-against-high-fat-diet-induced-obesity-in-mice
#4
Sarah W Renner, Lauren M Walker, Lawrence J Forsberg, Jonathan Z Sexton, Jay E Brenman
Carbonic anhydrases are a family of enzymes that catalyze the reversible condensation of water and carbon dioxide to carbonic acid, which spontaneously dissociates to bicarbonate. Carbonic anhydrase III (Car3) is nutritionally regulated at both the mRNA and protein level. It is highly enriched in tissues that synthesize and/or store fat: liver, white adipose tissue, brown adipose tissue, and skeletal muscle. Previous characterization of Car3 knockout mice focused on mice fed standard diets, not high-fat diets that significantly alter the tissues that highly express Car3...
2017: PloS One
https://www.readbyqxmd.com/read/28432282/loss-of-function-myostatin-mutation-increases-insulin-sensitivity-and-browning-of-white-fat-in-meishan-pigs
#5
Chunbo Cai, Lili Qian, Shengwang Jiang, Youde Sun, Qingqing Wang, Dezun Ma, Gaojun Xiao, Biao Li, Shanshan Xie, Ting Gao, Yaoxing Chen, Jie Liu, Xiaorong An, Wentao Cui, Kui Li
Myostatin-deficient mice showed a remarkable hypertrophy of skeletal muscle, with a decreased fat mass and enhanced insulin sensitivity. Currently, it is unclear if the inhibition of myostatin could be used as an approach to treat human obesity and insulin resistance. In this study, we investigated if the inhibition of porcine myostatin has any effect on fat deposition and insulin sensitivity using genetically engineered Meishan pigs containing a myostatin loss-of-function mutation (Mstn -/- ). Our results indicated that, when compared with wild-type pigs, the amount of subcutaneous fat and leaf fat of Mstn -/- pigs were significantly decreased mainly due to the browning of subcutaneous adipose tissue...
April 4, 2017: Oncotarget
https://www.readbyqxmd.com/read/28432201/mg53-biological-function-and-potential-as-a-therapeutic-target
#6
Yan Zhang, Hong-Kun Wu, Fengxiang Lv, Rui-Ping Xiao
MG53 (also known as TRIM72) is a cardiac and skeletal muscle-specific TRIM-family protein that exhibits multiple biological functions. First, MG53 participates in plasma membrane repair of the heart, skeletal muscle and other tissues. Second, MG53 is essentially involved in the cardioprotection of cardiac ischemic, pre-conditioning and post-conditioning, by activating the PI3K-Akt-GSK3β and ERK1/2 survival signaling pathways. Moreover, systemic delivery of recombinant MG53 protein ameliorates the impact of a range of injury insults on heart, skeletal muscle, lung, kidney, skin and brain...
April 21, 2017: Molecular Pharmacology
https://www.readbyqxmd.com/read/28432116/effects-of-exercise-and-aging-on-skeletal-muscle
#7
Giovanna Distefano, Bret H Goodpaster
A substantial loss of muscle mass and strength (sarcopenia), a decreased regenerative capacity, and a compromised physical performance are hallmarks of aging skeletal muscle. These changes are typically accompanied by impaired muscle metabolism, including mitochondrial dysfunction and insulin resistance. A challenge in the field of muscle aging is to dissociate the effects of chronological aging per se on muscle characteristics from the secondary influence of lifestyle and disease processes. Remarkably, physical activity and exercise are well-established countermeasures against muscle aging, and have been shown to attenuate age-related decreases in muscle mass, strength, and regenerative capacity, and slow or prevent impairments in muscle metabolism...
April 21, 2017: Cold Spring Harbor Perspectives in Medicine
https://www.readbyqxmd.com/read/28431322/xanthohumol-and-8-prenylnaringenin-ameliorate-diabetic-related-metabolic-dysfunctions-in-mice
#8
Raquel Costa, Ilda Rodrigues, Luísa Guardão, Sílvia Rocha-Rodrigues, Carolina Silva, José Magalhães, Manuel Ferreira-de-Almeida, Rita Negrão, Raquel Soares
Type 2 diabetes mellitus (T2DM) is a chronic disease characterized by metabolic disturbances in specific tissues. The present work aimed to analyze the effects of xanthohumol (XN) and 8-prenylnaringenin (8PN), two beer-derived polyphenols, in liver and skeletal muscle lipid and glycolytic metabolism in T2DM mice model. Thirty C57Bl/6 mice were randomly divided into five groups: standard diet (control), high-fat diet (DM), high-fat diet plus ethanol (DM-Ethanol), high-fat diet plus 10 mg/L XN (DM-XN) and high-fat diet plus 10 mg/L 8PN (DM-8PN) during 20 weeks...
April 6, 2017: Journal of Nutritional Biochemistry
https://www.readbyqxmd.com/read/28429889/omentin-treatment-of-epicardial-fat-improves-its-anti-inflammatory-activity-and-paracrine-benefit-on-smooth-muscle-cells
#9
Ángel Fernández-Trasancos, Rosa María Agra, Jose María García-Acuña, Ángel Luis Fernández, José Ramón González-Juanatey, Sonia Eiras
OBJECTIVE: Epicardial adipose tissue (EAT) in coronary artery disease is insulin resistant and has a proinflammatory profile. This study examined the regulation of EAT by exogenous omentin and its consequence on vascular cells. METHODS: Stromal vascular cells (SC) of EAT and subcutaneous adipose tissue (SAT) from patients who underwent heart surgery were cultured and exposed to adipogenic factors with or without omentin. Proinflammatory cytokine regulation by omentin was analyzed in SC and mature adipocytes...
April 21, 2017: Obesity
https://www.readbyqxmd.com/read/28428964/micrornas-mediated-regulation-of-skeletal-muscle-glut4-expression-and-translocation-in-insulin-resistance
#10
REVIEW
João Victor Esteves, Francisco Javier Enguita, Ubiratan Fabres Machado
The solute carrier family 2 facilitated glucose transporter member 4 (GLUT4) plays a key role in the insulin-induced glucose uptake by muscle and adipose tissues. In prediabetes and diabetes, GLUT4 expression/translocation has been detected as reduced, participating in mechanisms that impair glycemic control. Recently, a class of short endogenous noncoding RNAs named microRNAs (miRNAs) has been increasingly described as involved in the posttranscriptional epigenetic regulation of gene expression. The present review focuses on miRNAs potentially involved in the expression of GLUT4 expression, and proteins related to GLUT4 and translocation in skeletal muscle, seeking to correlate them with insulin resistance and diabetes...
2017: Journal of Diabetes Research
https://www.readbyqxmd.com/read/28428072/membrane-lipid-alterations-in-the-metabolic-syndrome-and-the-role-of-dietary-oils
#11
REVIEW
Javier S Perona
The metabolic syndrome is a cluster of pathological conditions, including hypertension, hyperglycemia, hypertriglyceridemia, obesity and low HDL levels that is of great concern worldwide, as individuals with metabolic syndrome have an increased risk of type-2 diabetes and cardiovascular disease. Insulin resistance, the key feature of the metabolic syndrome, might be at the same time cause and consequence of impaired lipid composition in plasma membranes of insulin-sensitive tissues like liver, muscle and adipose tissue...
April 18, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28428045/sco2-deficient-mice-develop-increased-adiposity-and-insulin-resistance
#12
Shauna Hill, Sathyaseelan S Deepa, Kavithalakshmi Sataranatarajan, Pavithra Premkumar, Daniel Pulliam, Yuhong Liu, Vanessa Y Soto, Kathleen E Fischer, Holly Van Remmen
Cytochrome c oxidase (COX) is an essential transmembrane protein complex (Complex IV) in the mitochondrial respiratory electron chain. Mutations in genes responsible for the assembly of COX are associated with Leigh syndrome, cardiomyopathy, spinal muscular atrophy and other fatal metabolic disorders in humans. Previous studies have shown that mice lacking the COX assembly protein Surf1 (Surf1(-/-) mice) paradoxically show a number of beneficial metabolic phenotypes including increased insulin sensitivity, upregulation of mitochondrial biogenesis, induction of stress response pathways and increased lifespan...
April 17, 2017: Molecular and Cellular Endocrinology
https://www.readbyqxmd.com/read/28423886/adiponectin-induced-ampk-impairment-mediates-insulin-resistance-in-bama-mini-pig-fed-high-fat-and-high-sucrose-diet
#13
Miaomiao Niu, Lei Xiang, Yaqian Liu, Yuqiong Zhao, Jifang Yuan, Xin Dai, Hua Chen
Objective: Adipose tissue is no longer considered as an inert storage organ for lipid, but instead is thought to play an active role in regulating insulin effects via secretion adipokines. However, conflicting reports have emerged regarding the effects of adipokines. In this study, we investigated the role of adipokines in glucose metabolism and insulin sensitivity in obese Bama mini-pigs. Methods: An obesity model was established in Bama mini-pigs, by feeding with high-fat and high-sucrose diet for 30 weeks...
March 25, 2017: Asian-Australasian Journal of Animal Sciences
https://www.readbyqxmd.com/read/28420763/reduced-body-weight-gain-in-ubiquilin-1-transgenic-mice-is-associated-with-increased-expression-of-energy-sensing-proteins
#14
Fangfang Qiao, Kirsty R Longley, Shelley Feng, Sabrina Schnack, Hongbo Gao, Yifan Li, Evelyn H Schlenker, Hongmin Wang
Ubiquilin-1 (Ubqln1), a ubiquitin-like protein, is implicated in a variety of pathophysiological processes, but its role in mediating body weight gain or metabolism has not been determined. Here, we demonstrate that global overexpression of Ubqln1 in a transgenic (Tg) mouse reduces the animal's body weight gain. The decreased body weight gain in Tg mice is associated with lower visceral fat content and higher metabolic rate. The Ubqln1 Tg mice exhibited reduced leptin and insulin levels as well as increased insulin sensitivity manifested by homeostatic model assessment of insulin resistance...
April 2017: Physiological Reports
https://www.readbyqxmd.com/read/28420091/dietary-sugars-and-endogenous-formation-of-advanced-glycation-endproducts-emerging-mechanisms-of-disease
#15
REVIEW
Manuela Aragno, Raffaella Mastrocola
The rapid increase in metabolic diseases, which occurred in the last three decades in both industrialized and developing countries, has been related to the rise in sugar-added foods and sweetened beverages consumption. An emerging topic in the pathogenesis of metabolic diseases related to modern nutrition is the role of Advanced Glycation Endproducts (AGEs). AGEs can be ingested with high temperature processed foods, but also endogenously formed as a consequence of a high dietary sugar intake. Animal models of high sugar consumption, in particular fructose, have reported AGE accumulation in different tissues in association with peripheral insulin resistance and lipid metabolism alterations...
April 14, 2017: Nutrients
https://www.readbyqxmd.com/read/28420087/skeletal-muscle-nucleo-mitochondrial-crosstalk-in-obesity-and-type-2-diabetes
#16
REVIEW
Prasad P Devarshi, Sean M McNabney, Tara M Henagan
Skeletal muscle mitochondrial dysfunction, evidenced by incomplete beta oxidation and accumulation of fatty acid intermediates in the form of long and medium chain acylcarnitines, may contribute to ectopic lipid deposition and insulin resistance during high fat diet (HFD)-induced obesity. The present review discusses the roles of anterograde and retrograde communication in nucleo-mitochondrial crosstalk that determines skeletal muscle mitochondrial adaptations, specifically alterations in mitochondrial number and function in relation to obesity and insulin resistance...
April 14, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28417082/improving-glucose-tolerance-by-muscle-damaging-exercise
#17
Chien-Te Ho, Machiko Otaka, Chia-Hua Kuo
Tissue damage is regarded as an unwanted medical condition to be avoided. However, introducing tolerable tissue damages has been used as a therapeutic intervention in traditional and complementary medicine to cure discomfort and illness. Eccentric exercise is known to cause significant necrosis and insulin resistance of skeletal muscle. The purpose of this study was to determine the magnitude of muscle damage and blood glucose responses during an oral glucose tolerance test (OGTT) after eccentric training in 21 young participants...
April 2017: Journal of Traditional and Complementary Medicine
https://www.readbyqxmd.com/read/28416312/periapical-lesions-increase-macrophage-infiltration-and-inflammatory-signaling-in-muscle-tissue-of-rats
#18
Renato Felipe Pereira, Luciano Tavares Angelo Cintra, Gestter Willian Lattari Tessarin, Fernando Yamamoto Chiba, Maria Sara de Lima Coutinho Mattera, Natalia Francisco Scaramele, Thais Verônica Saori Tsosura, Edilson Ervolino, Sandra Helena Penha de Oliveira, Doris Hissako Sumida
INTRODUCTION: Our previous studies have shown that periapical lesions (PLs) in rats cause systemic disorders such as increased tumor necrosis factor-α plasma levels, insulin resistance, and impairment in insulin signal transduction in muscle tissue. However, the mechanisms involved in these alterations are not fully understood. Under chronic inflammatory conditions such as obesity, it has been shown that the skeletal muscle is affected by inflammation, and the number of resident macrophages that are associated with impairments of insulin action and sensitivity is increased...
April 14, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28411689/moutan-cortex-and-paeoniae-radix-rubra-reverse-high-fat-diet-induced-metabolic-disorder-and-restore-gut-microbiota-homeostasis
#19
Ling-Jun Zhong, Zhi-Sheng Xie, Hua Yang, Ping Li, Xiao-Jun Xu
The present study was designed to investigate the therapeutic effcts of Moutan Cortex (CM, root bark of Paeonia suffruticosa Andr) and Paeoniae Radix Rubra (PR, root of Paeonia veitchii Lynch) on metabolic disorders, focusing on the infuence of CM and PR on the obesity-related gut microbiota homeostasis. The diet-induced obese (DIO) mouse model was used to test the therapeutic effects of CM and PR. The mice were orally administered with CM and PR for 6 weeks, and oral glucose tolerance test (OGTT) and insulin tolerance test (ITT) were performed to evaluate the insulin sensitivity of the mice...
March 2017: Chinese Journal of Natural Medicines
https://www.readbyqxmd.com/read/28405802/vasculo-protective-effect-of-bms-309403-is-independent-of-its-specific-inhibition-of-fatty-acid-binding-protein-4
#20
Yuta Okamura, Kosuke Otani, Akihiro Sekiguchi, Taisuke Kogane, Chiharu Kakuda, Yuzaburo Sakamoto, Tomoko Kodama, Muneyoshi Okada, Hideyuki Yamawaki
Fatty acid-binding protein (FABP) 4 is an adipocytokine mainly expressed in adipocyte and macrophage. Blood FABP4 is related not only to metabolic disorders including insulin resistance and atherosclerosis but also increased blood pressure. We tested the hypothesis that FABP4 plays roles in pathogenesis of hypertension development including proliferation, migration, and inflammation of vascular smooth muscle cells (SMCs) as well as contractile reactivity. FABP4 alone had no influence on proliferation, migration, and inflammation of rat mesenteric arterial SMCs, while it significantly enhanced smooth muscle contraction and increases of systolic blood pressure (SBP) induced by noradrenaline (NA)...
April 13, 2017: Pflügers Archiv: European Journal of Physiology
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