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skeletal muscle mass

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https://www.readbyqxmd.com/read/28087734/increased-mitophagy-in-the-skeletal-muscle-of-spinal-and-bulbar-muscular-atrophy-patients
#1
Doriana Borgia, Adriana Malena, Marco Spinazzi, Maria Andrea Desbats, Leonardo Salviati, Aaron P Russell, Giovanni Miotto, Laura Tosatto, Elena Pegoraro, Gianni Sorarù, Maria Pennuto, Lodovica Vergani
Spinal and bulbar muscular atrophy (SBMA) is a neuromuscular disorder caused by polyglutamine expansion in the androgen receptor (AR) and characterized by the loss of lower motor neurons. Here we investigated pathological processes occurring in muscle biopsy specimens derived from SBMA patients and, as controls, age-matched healthy subjects and patients suffering from amyotrophic lateral sclerosis (ALS) and neurogenic atrophy. We detected atrophic fibers in the muscle of SBMA, ALS and neurogenic atrophy patients...
January 13, 2017: Human Molecular Genetics
https://www.readbyqxmd.com/read/28078418/absolute-quantification-of-myosin-heavy-chain-isoforms-by-selected-reaction-monitoring-can-underscore-skeletal-muscle-changes-in-a-mouse-model-of-amyotrophic-lateral-sclerosis
#2
Caterina Peggion, Maria Lina Massimino, Giancarlo Biancotto, Roberto Angeletti, Carlo Reggiani, Maria Catia Sorgato, Alessandro Bertoli, Roberto Stella
Skeletal muscle fibers contain different isoforms of myosin heavy chain (MyHC) that define distinctive contractile properties. In light of the muscle capacity to adapt MyHC expression to pathophysiological conditions, a rapid and quantitative assessment of MyHC isoforms in small muscle tissue quantities would represent a valuable diagnostic tool for (neuro)muscular diseases. As past protocols did not meet these requirements, in the present study we applied a targeted proteomic approach based on selected reaction monitoring that allowed the absolute quantification of slow and fast MyHC isoforms in different mouse skeletal muscles with high reproducibility...
January 11, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28074267/reduced-serum-myostatin-concentrations-associated-with-genetic-muscle-disease-progression
#3
Peter M Burch, Oksana Pogoryelova, Joe Palandra, Richard Goldstein, Donald Bennett, Lori Fitz, Michela Guglieri, Chiara Marini Bettolo, Volker Straub, Teresinha Evangelista, Hendrik Neubert, Hanns Lochmüller, Carl Morris
Myostatin is a highly conserved protein secreted primarily from skeletal muscle that can potently suppress muscle growth. This ability to regulate skeletal muscle mass has sparked intense interest in the development of anti-myostatin therapies for a wide array of muscle disorders including sarcopenia, cachexia and genetic neuromuscular diseases. While a number of studies have examined the circulating myostatin concentrations in healthy and sarcopenic populations, very little data are available from inherited muscle disease patients...
January 10, 2017: Journal of Neurology
https://www.readbyqxmd.com/read/28072766/the-impact-of-body-composition-parameters-on-ipilimumab-toxicity-and-survival-in-patients-with-metastatic-melanoma
#4
Louise E Daly, Derek G Power, Áine O'Reilly, Paul Donnellan, Samantha J Cushen, Kathleen O'Sullivan, Maria Twomey, David P Woodlock, Henry P Redmond, Aoife M Ryan
BACKGROUND: Body composition is an important predictor of drug toxicity and outcome. Ipilimumab (Ipi), a monoclonal antibody used to treat metastatic melanoma, has specific toxicities. No validated biomarkers that predict Ipi toxicity and efficacy exist. Also, the impact of Ipi on body composition has not been established. METHODS: Patients with metastatic melanoma treated with Ipi between 2009 and 2015 were included. Body composition was assessed by computed tomography at baseline and after four cycles of Ipi...
January 10, 2017: British Journal of Cancer
https://www.readbyqxmd.com/read/28070865/sphingosine-1-phosphate-pretreatment-amends-hypoxia-induced-metabolic-dysfunction-and-impairment-of-myogenic-potential-in-differentiating-c2c12-myoblasts-by-stimulating-viability-calcium-homeostasis-and-energy-generation
#5
Babita Rahar, Sonam Chawla, Sanjay Pandey, Anant Narayan Bhatt, Shweta Saxena
Sphingosine-1-phosphate (S1P) has a role in transpiration in patho-physiological signaling in skeletal muscles. The present study evaluated the pre-conditioning efficacy of S1P in facilitating differentiation of C2C12 myoblasts under a normoxic/hypoxic cell culture environment. Under normoxia, exogenous S1P significantly promoted C2C12 differentiation as evident from morphometric descriptors and differentiation markers of the mature myotubes, but it could facilitate only partial recovery from hypoxia-induced compromised differentiation...
January 9, 2017: Journal of Physiological Sciences: JPS
https://www.readbyqxmd.com/read/28068193/the-improvement-in-walking-speed-induced-by-resistance-training-is-associated-with-increased-muscular-strength-but-not-skeletal-muscle-mass-in-older-women
#6
Leandro Santos, Alex S Ribeiro, Brad J Schoenfeld, Matheus A Nascimento, Crisieli M Tomeleri, Mariana F Souza, Fábio L C Pina, Edilson S Cyrino
OBJECTIVE: The purpose of the present study was to analyze whether improvements in fast walking speed induced by resistance training (RT) are associated with changes in body composition, muscle quality, and muscular strength in older women. METHODS: Twenty-three healthy older women (69.6 ± 6.4 years, 64.95 ± 12.9 kg, 1.55 ± 0.07 m, 27.06 ± 4.6 kg/m²) performed a RT program for 8 weeks consisting of 8 exercises for the whole body, 3 sets of 10-15 repetitions maximum, 3 times a week...
January 9, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/28064564/aspartate-inhibits-lps-induced-mafbx-and-murf1-expression-in-skeletal-muscle-in-weaned-pigs-by-regulating-akt-ampk%C3%AE-and-foxo1
#7
Yulan Liu, Xiuying Wang, Weibo Leng, Dingan Pi, Zhixiao Tu, Huiling Zhu, Haifeng Shi, Shuang Li, Yongqing Hou, Chien-An Andy Hu
Infection and inflammation can result in the rapid loss of muscle mass and myofibrillar proteins (muscle atrophy). In addition, aspartate (Asp) is necessary for protein synthesis in mammalian cells. We hypothesized that Asp could attenuate LPS-induced muscle atrophy in a piglet model. Twenty-four weaning piglets were allotted to four treatments, including non-challenged control, LPS challenged control, LPS+0.5% Asp and LPS+1.0% Asp. On d 21, the piglets were injected with i.p. injection of LPS (100 ug/kg BM) or saline...
January 2017: Innate Immunity
https://www.readbyqxmd.com/read/28063507/prevalence-of-low-muscle-mass-according-to-body-mass-index-in-older-adults
#8
Christophe E Graf, Claude Pichard, François R Herrmann, Cornel C Sieber, Dina Zekry, Laurence Genton
OBJECTIVE: Low muscle mass has been associated with increased morbi-mortality and should be identified for optimizing preventive and therapeutic strategies. This study evaluates the prevalence of bioelectrical impedance analysis (BIA)-derived low muscle mass in older persons using definitions found through a systematic literature search and determines the link between body mass index (BMI) and low muscle mass. METHODS: We performed a systematic search of trials involving ≥100 persons that derived low muscle mass from BIA and reported cut-offs for low muscle mass normalized for body height or weight...
February 2017: Nutrition
https://www.readbyqxmd.com/read/28061324/oral-corticosterone-administration-reduces-insulitis-but-promotes-insulin-resistance-and-hyperglycemia-in-male-nonobese-diabetic-mice
#9
Susan J Burke, Heidi M Batdorf, Adrianna E Eder, Michael D Karlstad, David H Burk, Robert C Noland, Z Elizabeth Floyd, J Jason Collier
Steroid-induced diabetes is the most common form of drug-induced hyperglycemia. Therefore, metabolic and immunological alterations associated with chronic oral corticosterone were investigated using male nonobese diabetic mice. Three weeks after corticosterone delivery, there was reduced sensitivity to insulin action measured by insulin tolerance test. Body composition measurements revealed increased fat mass and decreased lean mass. Overt hyperglycemia (>250 mg/dL) manifested 6 weeks after the start of glucocorticoid administration, whereas 100% of the mice receiving the vehicle control remained normoglycemic...
January 4, 2017: American Journal of Pathology
https://www.readbyqxmd.com/read/28060442/effects-of-6%C3%A2-months-of-aerobic-and-resistance-exercise-training-on-carotid-artery-intima-media-thickness-in-overweight-and-obese-older-women
#10
Jinkee Park, Hyuntea Park
AIM: We studied the effects of exercise on carotid intima-media thickness, luminal diameter, and flow velocity in overweight and obese older women, and the associations between carotid parameters changes and other variables. METHODS: A total of 41 overweight and obese older women (aged 65-77 years, fat mass percent ≥ 32%), who were divided into a control group (n = 20) and a supervised combined exercise group (n = 21). The 24-week combined exercise program (aerobic and resistance exercise) consisted of sessions 40-80 min in length 5 days per week under the supervision of an exercise specialist...
January 6, 2017: Geriatrics & Gerontology International
https://www.readbyqxmd.com/read/28059464/adults-with-initial-metabolic-syndrome-have-altered-muscle-deoxygenation-during-incremental-exercise
#11
Alessandro da Costa Machado, Thales Coelho Barbosa, Allan Robson Kluser Sales, Marcio Nogueira de Souza, Antonio Claudio Lucas da Nóbrega, Bruno Moreira Silva
OBJECTIVE: Reduced aerobic power is independently associated with metabolic syndrome (MetS) incidence and prevalence in adults. This study investigated whether muscle deoxygenation (proxy of microvascular O2 extraction) during incremental exercise is altered in MetS and associated with reduced oxygen consumption ( V˙O2peak ). METHODS: Twelve men with initial MetS (no overt diseases and medication-naive; mean ± SD, age 38 ± 7 years) and 12 healthy controls (HCs) (34 ± 7 years) completed an incremental cycling test to exhaustion, in which pulmonary ventilation and gas exchange (metabolic analyzer), as well as vastus lateralis deoxygenation (near infrared spectroscopy), were measured...
January 6, 2017: Obesity
https://www.readbyqxmd.com/read/28053000/myoblast-replication-is-reduced-in-the-iugr-fetus-despite-maintained-proliferative-capacity-in-vitro
#12
Susan M Soto, Amy C Blake, Stephanie R Wesolowski, Paul J Rozance, Kristen B Barthel, Bifeng Gao, Byron Hetrick, Carrie McCurdy, Natalia G Garza, William Hay, Leslie A Leinwand, Jacob E Friedman, Laura D Brown
Adults who were affected by intrauterine growth restriction (IUGR) suffer from reductions in muscle mass and insulin resistance, suggesting muscle growth may be restricted by molecular events that occur during fetal development. To explore the basis of restricted fetal muscle growth, we used a sheep model of progressive placental insufficiency-induced IUGR to assess myoblast proliferation within intact skeletal muscle in vivo and isolated myoblasts stimulated with insulin in vitro. Gastrocnemius and soleus muscle weights were reduced by 25% in IUGR fetuses compared to controls (CON)...
January 4, 2017: Journal of Endocrinology
https://www.readbyqxmd.com/read/28052593/panoramic-ultrasound-a-novel-and-valid-tool-for-monitoring-change-in-muscle-mass
#13
Jessica M Scott, David S Martin, Robert Ploutz-Snyder, Timothy Matz, Timothy Caine, Meghan Downs, Kyle Hackney, Roxanne Buxton, Jeffrey W Ryder, Lori Ploutz-Snyder
BACKGROUND: The strong link between reduced muscle mass and morbidity and mortality highlights the urgent need for simple techniques that can monitor change in skeletal muscle cross-sectional area (CSA). Our objective was to examine the validity of panoramic ultrasound to detect change in quadriceps and gastrocnemius size in comparison with magnetic resonance imaging (MRI) in subjects randomized to 70 days of bed rest (BR) with or without exercise. METHODS: Panoramic ultrasound and MRI images of the quadriceps and gastrocnemius muscles were acquired on the right leg of 27 subjects (26 male, 1 female; age: 34...
January 3, 2017: Journal of Cachexia, Sarcopenia and Muscle
https://www.readbyqxmd.com/read/28051799/%C3%A2-sarcopenia-predicts-reduced-survival-in-patients-with-hepatocellular-carcinoma-at-first-diagnosis
#14
Paola Begini, Elia Gigante, Giulio Antonelli, Francesco Carbonetti, Elsa Iannicelli, Giulia Anania, Barbara Imperatrice, Adriano Maria Pellicelli, Gianfranco Delle Fave, Massimo Marignani
:  Background. Sarcopenia is a complication and independent risk factor for mortality in patients with liver cirrhosis. AIM: To assess the prevalence and influence of sarcopenia on overall survival in a cohort of cirrhotic patients with hepatocellular carcinoma managed in a tertiary center. MATERIAL AND METHODS: Abdominal computed tomography of 92 consecutive hepatocellular carcinoma cirrhotic patients, enrolled and followed from 2004 to 2014, were retrospectively studied with a software analyzing the cross-sectional areas of muscles at third lumbar vertebra level...
January 2017: Annals of Hepatology
https://www.readbyqxmd.com/read/28050676/nutritional-risk-in-allogeneic-stem-cell-transplantation-rationale-for-a-tailored-nutritional-pathway
#15
Takashi Aoyama, Osamu Imataki, Keita Mori, Kanako Yoshitsugu, Masafumi Fukaya, Ikue Okamura, Terukazu Enami, Raine Tatara, Takashi Ikeda
Hematopoietic stem cell transplantation carries nutrition-related risks. Therefore, nutritional therapy needs to be initiated before transplantation even takes place. We assessed nutritional risk among patients who underwent allogeneic stem cell transplantation. We assessed nutrient supply (calorie supply and protein supply) by chart review. Assessments were made from the pretreatment phase of transplantation to after the end of parenteral nutrition in 51 patients who underwent allogeneic stem cell transplantation at Shizuoka Cancer Center between 2007 and 2012...
January 3, 2017: Annals of Hematology
https://www.readbyqxmd.com/read/28046182/regulation-in-free-amino-acid-profile-and-protein-synthesis-pathway-of-growing-pig-skeletal-muscles-by-low-protein-diets-for-different-time-periods
#16
Y H Li, H K Wei, F N Li, S W Kim, C Y Wen, Y H Duan, Q P Guo, W L Wang, H N Liu, Y L Yin
The objective of the study was to explore the extent to which the dietary CP level can be reduced for maintaining muscle protein deposition in growing pigs as well as the related mechanism and whether the response to dietary protein restriction is diversely modified throughout the 2 trial periods. A total of 36 pigs (9.57 ± 0.64 kg initial BW) were individually penned and fed 1 of 3 diets for 10 or 25 d. During each period, the diets contained 20, 17, and 14% CP, respectively. Both the 17% CP diet and the 14% CP diet were supplemented with Lys, Met, Thr, and Trp to provide the same total concentrations as those in the 20% CP diet...
December 2016: Journal of Animal Science
https://www.readbyqxmd.com/read/28042532/satellite-cells-contribution-to-exercise-mediated-muscle-hypertrophy-and-repair
#17
REVIEW
Behzad Bazgir, Rouhollah Fathi, Mojtaba Rezazadeh Valojerdi, Paul Mozdziak, Alireza Asgari
Satellite cells (SCs) are the most abundant skeletal muscle stem cells. They are widely recognized for their contributions to maintenance of muscle mass, regeneration and hypertrophy during the human life span. These cells are good candidates for cell therapy due to their self-renewal capabilities and presence in an undifferentiated form. Presently, a significant gap exists between our knowledge of SCs behavior and their application as a means for human skeletal muscle tissue repair and regeneration. Both physiological and pathological stimuli potentially affect SCs activation, proliferation, and terminal differentiation the former category being the focus of this article...
2017: Cell Journal
https://www.readbyqxmd.com/read/28039429/limited-potential-of-genetic-predisposition-scores-to-predict-muscle-mass-and-strength-performance-in-flemish-caucasians-between-19-73-years-of-age
#18
Ruben Charlier, Maarten Caspers, Sara Knaeps, Evelien Mertens, Diether Lambrechts, Johan Lefevre, Martine Thomis
Since both muscle mass and strength performance are polygenic in nature, the current study compared four Genetic Predisposition Scores (GPS) in their ability to predict these phenotypes. Data were gathered within the framework of the first generation Flemish Policy Research Centre 'Sport, Physical Activity and Health' (2002-2004). Results are based on muscle characteristics data of 565 Flemish Caucasians (19-73 yr, 365 men). Skeletal muscle mass (SMM) was determined using bioelectrical impedance. The Biodex dynamometer was used to measure isometric (PTstatic120°) and isokinetic strength (PTdynamic60° and PTdynamic240°), ballistic movement speed (S20%) and muscular endurance (Work) of the knee extensors...
December 30, 2016: Physiological Genomics
https://www.readbyqxmd.com/read/28039408/nrf2-deficiency-does-not-affect-denervation-induced-alterations-in-mitochondrial-fission-and-fusion-proteins-in-skeletal-muscle
#19
Yu Kitaoka, Kohei Takeda, Yuki Tamura, Shin Fujimaki, Tohru Takemasa, Hideo Hatta
Oxidative stress-induced mitochondrial dysfunction is associated with age-related and disuse-induced skeletal muscle atrophy. However, the role of nuclear factor erythroid 2-related factor 2 (Nrf2) during muscle fiber atrophy remains to be elucidated. In this study, we examined whether deficiency of Nrf2, a master regulator of antioxidant transcription, promotes denervation-induced mitochondrial fragmentation and muscle atrophy. We found that the expression of Nrf2 and its target antioxidant genes was upregulated at 2 weeks after denervation in wild-type (WT) mice...
December 2016: Physiological Reports
https://www.readbyqxmd.com/read/28039397/physical-exercise-in-aging-human-skeletal-muscle-increases-mitochondrial-calcium-uniporter-expression-levels-and-affects-mitochondria-dynamics
#20
Sandra Zampieri, Cristina Mammucari, Vanina Romanello, Laura Barberi, Laura Pietrangelo, Aurora Fusella, Simone Mosole, Gaia Gherardi, Christian Höfer, Stefan Löfler, Nejc Sarabon, Jan Cvecka, Matthias Krenn, Ugo Carraro, Helmut Kern, Feliciano Protasi, Antonio Musarò, Marco Sandri, Rosario Rizzuto
Age-related sarcopenia is characterized by a progressive loss of muscle mass with decline in specific force, having dramatic consequences on mobility and quality of life in seniors. The etiology of sarcopenia is multifactorial and underlying mechanisms are currently not fully elucidated. Physical exercise is known to have beneficial effects on muscle trophism and force production. Alterations of mitochondrial Ca(2+) homeostasis regulated by mitochondrial calcium uniporter (MCU) have been recently shown to affect muscle trophism in vivo in mice...
December 2016: Physiological Reports
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