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Muscle catabolism

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https://www.readbyqxmd.com/read/28526870/time-course-responses-of-circulating-micrornas-to-three-resistance-training-protocols-in-healthy-young-men
#1
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/28506762/the-nuclear-phosphatase-scp4-regulates-foxo-transcription-factors-during-muscle-wasting-in-chronic-kidney-disease
#2
Xinyan Liu, Rizhen Yu, Lijing Sun, Giacomo Garibotto, Xia Lin, Yanlin Wang, Sandhya S Thomas, Rongshan Li, Zhaoyong Hu
Chronic kidney disease (CKD) and related inflammatory responses stimulate protein-energy wasting, a complication causing loss of muscle mass. Primarily, muscle wasting results from accelerated protein degradation via autophagic/lysosomal and proteasomal pathways, but mechanisms regulating these proteolysis pathways remain unclear. Since dephosphorylation of FoxOs regulates ubiquitin/proteasome protein metabolism, we tested whether a novel nuclear phosphatase, the small C-terminal domain phosphatase (SCP) 4, regulates FoxOs signaling and, in turn, muscle wasting...
May 12, 2017: Kidney International
https://www.readbyqxmd.com/read/28505179/food-restriction-increase-the-expression-of-mtorc1-complex-genes-in-the-skeletal-muscle-of-juvenile-pacu-piaractus-mesopotamicus
#3
Tassiana Gutierrez de Paula, Bruna Tereza Thomazini Zanella, Bruno Evaristo de Almeida Fantinatti, Leonardo Nazário de Moraes, Bruno Oliveira da Silva Duran, Caroline Bredariol de Oliveira, Rondinelle Artur Simões Salomão, Rafaela Nunes da Silva, Carlos Roberto Padovani, Vander Bruno Dos Santos, Edson Assunção Mareco, Robson Francisco Carvalho, Maeli Dal-Pai-Silva
Skeletal muscle is capable of phenotypic adaptation to environmental factors, such as nutrient availability, by altering the balance between muscle catabolism and anabolism that in turn coordinates muscle growth. Small noncoding RNAs, known as microRNAs (miRNAs), repress the expression of target mRNAs, and many studies have demonstrated that miRNAs regulate the mRNAs of catabolic and anabolic genes. We evaluated muscle morphology, gene expression of components involved in catabolism, anabolism and energetic metabolism and miRNAs expression in both the fast and slow muscle of juvenile pacu (Piaractus mesopotamicus) during food restriction and refeeding...
2017: PloS One
https://www.readbyqxmd.com/read/28475354/role-of-glucagon-in-catabolism-and-muscle-wasting-of-critical-illness-and-modulation-by-nutrition
#4
Steven E Thiessen, Sarah Derde, Inge Derese, Thomas Dufour, Chloé Albert Vega, Lies Langouche, Chloë Goossens, Nele Peersman, Pieter Vermeersch, Sarah Vander Perre, Jens J Holst, Pieter J Wouters, Ilse Vanhorebeek, Greet Van den Berghe
RATIONALE: Critical illness is hallmarked by muscle wasting and disturbances in glucose, lipid and amino acid homeostasis. Circulating concentrations of glucagon, a catabolic hormone that affects these metabolic pathways, are elevated during critical illness. Insight in the nutritional regulation of glucagon and its metabolic role during critical illness is lacking. OBJECTIVES: We evaluated whether macronutrient infusion can suppress plasma glucagon during critical illness and studied the role of illness-induced glucagon abundance in the disturbed glucose, lipid and amino acid homeostasis and in muscle wasting during critical illness...
May 5, 2017: American Journal of Respiratory and Critical Care Medicine
https://www.readbyqxmd.com/read/28469577/interference-with-ca-2-dependent-proteolysis-does-not-alter-the-course-of-muscle-wasting-in-experimental-cancer-cachexia
#5
Fabrizio Pin, Valerio G Minero, Fabio Penna, Maurizio Muscaritoli, Roberta De Tullio, Francesco M Baccino, Paola Costelli
Protein hypercatabolism significantly contributes to the onset and progression of muscle wasting in cancer cachexia. In this regard, a major role is played by the ATP-ubiquitin-proteasome-dependent pathway and by autophagy. However, little is known about the relevance of the Ca(2+)-dependent proteolytic system. Since previous results suggested that this pathway is activated in the skeletal muscle of tumor hosts, the present study was aimed to investigate whether inhibition of Ca(2+)-dependent proteases (calpains) may improve cancer-induced muscle wasting...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28467934/ppar%C3%AE-promotes-running-endurance-by-preserving-glucose
#6
Weiwei Fan, Wanda Waizenegger, Chun Shi Lin, Vincenzo Sorrentino, Ming-Xiao He, Christopher E Wall, Hao Li, Christopher Liddle, Ruth T Yu, Annette R Atkins, Johan Auwerx, Michael Downes, Ronald M Evans
Management of energy stores is critical during endurance exercise; a shift in substrate utilization from glucose toward fat is a hallmark of trained muscle. Here we show that this key metabolic adaptation is both dependent on muscle PPARδ and stimulated by PPARδ ligand. Furthermore, we find that muscle PPARδ expression positively correlates with endurance performance in BXD mouse reference populations. In addition to stimulating fatty acid metabolism in sedentary mice, PPARδ activation potently suppresses glucose catabolism and does so without affecting either muscle fiber type or mitochondrial content...
May 2, 2017: Cell Metabolism
https://www.readbyqxmd.com/read/28467016/body-fat-attenuates-muscle-mass-catabolism-among-physically-active-humans-in-temperate-and-cold-high-altitude-environments
#7
Cara J Ocobock
OBJECTIVE: Typical diet plans are based on an individual's body mass; however, body composition may be important to consider when an individual is in a negative energy balance. This study examines if high initial body fat and dietary macronutrient content reduce muscle mass catabolism during excursions in temperate and cold high altitude environments. METHODS: Subjects-53 healthy, un-acclimated volunteers (37 males and 16 females)-took part in 12-16 week-long outdoor education courses in moderately high altitude temperate and cold climates in the western United States...
May 3, 2017: American Journal of Human Biology: the Official Journal of the Human Biology Council
https://www.readbyqxmd.com/read/28462983/alterations-in-metabolic-patterns-have-a-key-role-in-diagnosis-and-progression-of-primrose-syndrome
#8
Alberto Casertano, Paolo Fontana, Raoul C Hennekam, Marco Tartaglia, Rita Genesio, Tina Barbaro Dieber, Lucia Ortega, Lucio Nitsch, Daniela Melis
Primrose syndrome is characterized by unusual facial features, macrocephaly, intellectual disability, enlarged, and calcified external ears, sparse body hair, and distal muscle wasting. Nine patients have been described in the literature. The disorder is due to missense mutations in ZBTB20. Here we describe one newly diagnosed 18-month-old patient and provide 10 year follow-up of an earlier reported patient, highlighting the progression and complexity of the disorder. Metabolic studies showed reduced glucose tolerance with prevalence of amino acids and fatty acids catabolism, ketogenesis, and gluconeogenesis, resulting in a Krebs cycle reversion...
April 30, 2017: American Journal of Medical Genetics. Part A
https://www.readbyqxmd.com/read/28462693/sarcopenia-in-patients-with-advanced-liver-disease
#9
Francesca Romana Ponziani, Antonio Gasbarrini
Sarcopenia is the loss of muscle mass and function, affecting up to 70% of patients with advanced liver disease. Liver cirrhosis is characterized by an altered glucose metabolism, lipid oxidation, ketogenesis and protein catabolism, leading to the loss of adipose and muscle tissue. The gastrointestinal dysfunction of cirrhotic patients results in inadequate nutrients intake and is responsible for muscle weakness thus limiting physical exercise and perpetuating the reduction of muscle mass. Recently, alterations of hormonal pathways involved in muscle growth, increased intestinal permeability and changes in the gut microbiota composition have been reported in cirrhotic patients...
April 28, 2017: Current Protein & Peptide Science
https://www.readbyqxmd.com/read/28461063/low-intensity-pulsed-ultrasound-promotes-exercise-induced-muscle-hypertrophy
#10
Liang Tang, Jing Zhang, Xinjuan Zhao, Nan Li, Wenqi Jian, Shuxin Sun, Jianzhong Guo, Lijun Sun, Dean Ta
The purpose of this study was to investigate whether low-intensity pulsed ultrasound (LIPUS) promotes exercise-induced muscle hypertrophy. Twenty-four adult Sprague-Dawley (SD) rats were randomly assigned to three groups (n = 8 per group): normal control group (NC), treadmill exercise group (TE) and treadmill exercise + LIPUS group (TE + LIPUS). The TE + LIPUS group received a LIPUS treatment (1 MHz, 30 mW/cm(2)) at the gastrocnemius for 20 min/d after treadmill exercise. The TE group was sham-treated...
April 28, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28458807/denervation-does-not-induce-muscle-atrophy-through-oxidative-stress
#11
Eva Pigna, Emanuela Greco, Giulio Morozzi, Silvia Grottelli, Alessio Rotini, Alba Minelli, Stefania Fulle, Sergio Adamo, Rosa Mancinelli, Ilaria Bellezza, Viviana Moresi
Denervation leads to the activation of the catabolic pathways, such as the ubiquitin-proteasome and autophagy, resulting in skeletal muscle atrophy and weakness. Furthermore, denervation induces oxidative stress in skeletal muscle, which is thought to contribute to the induction of skeletal muscle atrophy. Several muscle diseases are characterized by denervation, but the molecular pathways contributing to muscle atrophy have been only partially described. Our study delineates the kinetics of activation of oxidative stress response in skeletal muscle following denervation...
February 24, 2017: European Journal of Translational Myology
https://www.readbyqxmd.com/read/28456887/heterogeneous-phenotypes-in-lipid-storage-myopathy-due-to-etfdh-gene-mutations
#12
Corrado Angelini, Daniela Tavian, Sara Missaglia
We present six novel patients affected by lipid storage myopathy (LSM) presenting mutations in the ETFDH gene. Although the diagnosis of multiple acyl-coenzyme-A dehydrogenase deficiency (MADD) in adult life is difficult, it is rewarding because of the possibility of treating patients with carnitine or riboflavin, leading to a full recovery. In our patients, a combination of precipitating risk factors including previous anorexia, alcoholism, poor nutrition, and pregnancy contributed to a metabolic critical condition that precipitated the catabolic state...
April 30, 2017: JIMD Reports
https://www.readbyqxmd.com/read/28456475/advanced-glycation-end-products-and-strontium-ranelate-promote-osteogenic-differentiation-of-vascular-smooth-muscle-cells-in%C3%A2-vitro-preventive-role-of-vitamin-d
#13
María Silvina Molinuevo, Juan Manuel Fernández, Ana María Cortizo, Antonio Desmond McCarthy, León Schurman, Claudia Sedlinsky
Advanced glycation end products (AGE) have been demonstrated to induce the osteogenic trans-differentiation of vascular smooth muscle cells (VSMC). Strontium ranelate (SR) is an anti-osteoporotic agent that has both anti-catabolic and anabolic actions on bone tissue. However, in the last years SR has been associated with an increase of cardiovascular risk. We hypothesize that SR can increase the osteoblastic trans-differentiation of VSMC and the induction of extracellular calcifications, an effect that could be potentiated in the presence of AGE and inhibited by simultaneous administration of vitamin D...
April 26, 2017: Molecular and Cellular Endocrinology
https://www.readbyqxmd.com/read/28448552/transcriptomic-analysis-of-the-hepatic-response-to-stress-in-the-red-cusk-eel-genypterus-chilensis-insights-into-lipid-metabolism-oxidative-stress-and-liver-steatosis
#14
Sebastian Naour, Brisa M Espinoza, Jorge E Aedo, Rodrigo Zuloaga, Jonathan Maldonado, Macarena Bastias-Molina, Herman Silva, Claudio Meneses, Cristian Gallardo-Escarate, Alfredo Molina, Juan Antonio Valdés
Teleosts exhibit a broad divergence in their adaptive response to stress, depending on the magnitude, duration, and frequency of stressors and the species receiving the stimulus. We have previously reported that the red cusk-eel (Genypterus chilensis), an important marine farmed fish, shows a physiological response to stress that results in increased skeletal muscle atrophy mediated by over-expression of components of the ubiquitin proteasome and autophagy-lysosomal systems. To better understand the systemic effects of stress on the red cusk-eel metabolism, the present study assessed the transcriptomic hepatic response to repetitive handling-stress...
2017: PloS One
https://www.readbyqxmd.com/read/28448295/the-role-of-mitochondrial-stress-in-muscle-wasting-following-severe-burn-trauma
#15
John O Ogunbileje, David N Herndon, Andrew J Murton, Craig Porter
Increased resting metabolic rate (hypermetabolism) and skeletal muscle wasting are hallmarks of the pathophysiological stress response to severe burn trauma. However, whether these two responses occur independently in burn patients or are in fact related remains unclear. In light of recent evidence demonstrating that increased proteolysis in skeletal muscle of burned patients is accompanied by mitochondrial hypermetabolism, oxidative stress, and protein damage; in this article, we discuss the evidence for a role for the mitochondrion in skeletal muscle wasting following severe burn trauma...
April 21, 2017: Journal of Burn Care & Research: Official Publication of the American Burn Association
https://www.readbyqxmd.com/read/28446262/dietary-supplementation-of-branched-chain-amino-acids-increases-muscle-net-amino-acid-fluxes-through-elevating-their-substrate-availability-and-intramuscular-catabolism-in-young-pigs
#16
Liufeng Zheng, Fangrui Zuo, Shengjun Zhao, Pingli He, Hongkui Wei, Quanhang Xiang, Jiaman Pang, Jian Peng
Branched-chain amino acids (BCAA) have been clearly demonstrated to have anabolic effects on muscle protein synthesis. However, little is known about their roles in the regulation of net AA fluxes across skeletal muscle in vivo. This study was aimed to investigate the effect and related mechanisms of dietary supplementation of BCAA on muscle net amino acid (AA) fluxes using the hindlimb flux model. In all fourteen 4-week-old barrows were fed reduced-protein diets with or without supplemental BCAA for 28 d. Pigs were implanted with carotid arterial, femoral arterial and venous catheters, and fed once hourly with intraarterial infusion of p-amino hippurate...
April 27, 2017: British Journal of Nutrition
https://www.readbyqxmd.com/read/28441626/myobolites-muscle-derived-metabolites-with-paracrine-and-systemic-effects
#17
REVIEW
Ayon Ibrahim, Michael Neinast, Zoltan P Arany
Intracellular metabolism in skeletal muscle has been studied for more than a century and is the stuff of textbooks. In contrast, the extracellular secretion of metabolites by muscle cells, and their effects on non-muscle cells near or far, has been investigated much less extensively. Here, we describe a number of cases in which striated muscle secretes a metabolite that elicits complex responses in other cells or tissues, with involvements in normal physiology as well as obesity, type II diabetes, and cardiac remodeling...
April 22, 2017: Current Opinion in Pharmacology
https://www.readbyqxmd.com/read/28438763/the-performing-animal-causes-and-consequences-of-body-remodelling-and-metabolic-adjustments-in-red-knots-facing-contrasting-thermal-environments
#18
François Vézina, Alexander R Gerson, Christopher G Guglielmo, Theunis Piersma
Using red knots (Calidris canutus) as a model, we determined how changes in mass and metabolic activity of organs relate to temperature-induced variation in metabolic performance. In cold-acclimated birds, we expected large muscles and heart, improved oxidative capacity and lipid transport, and we predicted that this would explain variation in maximal thermogenic capacity (Msum). We also expected larger digestive and excretory organs in these birds and predicted that this would explain variation in basal metabolic rate (BMR)...
April 24, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/28428966/nutrition-and-metabolism-in-burn-patients
#19
REVIEW
Audra Clark, Jonathan Imran, Tarik Madni, Steven E Wolf
Severe burn causes significant metabolic derangements that make nutritional support uniquely important and challenging for burned patients. Burn injury causes a persistent and prolonged hypermetabolic state and increased catabolism that results in increased muscle wasting and cachexia. Metabolic rates of burn patients can surpass twice normal, and failure to fulfill these energy requirements causes impaired wound healing, organ dysfunction, and susceptibility to infection. Adequate assessment and provision of nutritional needs is imperative to care for these patients...
2017: Burns and trauma
https://www.readbyqxmd.com/read/28428077/molecular-bases-of-the-crosstalk-between-bone-and-muscle
#20
Gerard Karsenty, Paula Mera
Exercise is an evolutionary conserved survival function that nowadays has beneficial health effects. The increased metabolic activity of contracting skeletal muscle affects the biology of many organs involved in regulating muscle functions. The discovery of hormones and cytokines secreted by bone and skeletal muscle during exercise, has recently added experimental credence to the notion that a crosstalk exists between these organs. Bone through the hormone osteocalcin, promotes exercise capacity in the mouse...
April 18, 2017: Bone
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