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https://www.readbyqxmd.com/read/29161316/acute-exercise-alters-skeletal-muscle-mitochondrial-respiration-and-h2o2-emission-in-response-to-hyperinsulinemic-euglycemic-clamp-in-middle-aged-obese-men
#1
Adam J Trewin, Itamar Levinger, Lewan Parker, Christopher S Shaw, Fabio R Serpiello, Mitchell J Anderson, Glenn K McConell, David L Hare, Nigel K Stepto
Obesity, sedentary lifestyle and aging are associated with mitochondrial dysfunction and impaired insulin sensitivity. Acute exercise increases insulin sensitivity in skeletal muscle; however, whether mitochondria are involved in these processes remains unclear. The aim of this study was to investigate the effects of insulin stimulation at rest and after acute exercise on skeletal muscle mitochondrial respiratory function (JO2) and hydrogen peroxide emission (JH2O2), and the associations with insulin sensitivity in obese, sedentary men...
2017: PloS One
https://www.readbyqxmd.com/read/29159769/diversity-effect-of-capsaicin-on-different-types-of-skeletal-muscle
#2
Gan Zhou, Lina Wang, Yaqiong Xu, Kelin Yang, Lv Luo, Leshan Wang, Yongxiang Li, Jiawen Wang, Gang Shu, Songbo Wang, Ping Gao, Xiaotong Zhu, Qianyun Xi, Jiajie Sun, Yongliang Zhang, Qingyan Jiang
Capsaicin is a major pungent content in green and red peppers which are widely used as spice, and capsaicin may activate different receptors. To determine whether capsaicin has different effects on different types of skeletal muscle, we applied different concentrations (0, 0.01, and 0.02%) of capsaicin in the normal diet and conducted a four-week experiment on Sprague-Dawley rats. The fiber type composition, glucose metabolism enzyme activity, and different signaling molecules' expressions of receptors were detected...
November 20, 2017: Molecular and Cellular Biochemistry
https://www.readbyqxmd.com/read/29159199/dna-mediated-gene-therapy-in-a-mouse-model-of-limb-girdle-muscular-dystrophy-2b
#3
Julia Ma, Christophe Pichavant, Haley du Bois, Mital Bhakta, Michele P Calos
Mutations in the gene for dysferlin cause a degenerative disorder of skeletal muscle known as limb girdle muscular dystrophy 2B. To achieve gene delivery of plasmids encoding dysferlin to hind limb muscles of dysferlin knockout mice, we used a vascular injection method that perfused naked plasmid DNA into all major muscle groups of the hind limb. We monitored delivery by luciferase live imaging and western blot, confirming strong dysferlin expression that persisted over the 3-month time course of the experiment...
December 15, 2017: Molecular Therapy. Methods & Clinical Development
https://www.readbyqxmd.com/read/29158884/a-mitochondrial-disorder-in-a-middle-age-iranian-patient-report-of-a-rare-case
#4
Mostafa Almasi, Mohammad Reza Motamed, Masoud Mehrpour, Bahram Haghi-Ashtiani, Fahimeh Haji Akhondi, Yalda Nilipour, Seyed-Mohammad Fereshtehnejad
Introduction: Mitochondrial encephalopathy, lactic acidosis, and stroke-like episodes (MELAS) can involve multiple systems and cause stroke-like episodes and status epilepticus. Case Presentation: A 48-year-old female with history of early fatigability, migraine-type headaches, and bilateral sensory-neural hearing loss presented 3 episodes of serial seizures. On admission she was affected by Wernicke aphasia and, then, right hemiparesis. Investigations showed elevated arterial lactate and ragged red fibers on muscle biopsy...
July 2017: Basic and Clinical Neuroscience
https://www.readbyqxmd.com/read/29157904/anti-fatigue-activity-of-an-arabinan-rich-pectin-from-acerola-malpighia-emarginata
#5
Rafael Roberto Klosterhoff, Luiz K S Kanazawa, Ana L D M Furlanetto, Joao V C Peixoto, Claudia R Corso, Eliana R Adami, Marcello Iacomini, Rosalvo T H Fogaça, Alexandra Acco, Silvia M S C Cadena, Roberto Andreatini, Lucimara M C Cordeiro
A fraction composed of an arabinan-rich pectin was extracted from acerola fruit (Malpighia emarginata) and named ACWS. This fraction presented 93% of total carbohydrate, relative molecular weight of 7.5×10(4)g/mol, galacturonic acid, arabinose, galactose, xylose and rhamnose in 52.1:32.4:7.2:4.8:3.5 molar ratio and had its structure confirmed by NMR analysis. The anti-fatigue activity of ACWS was evaluated using the weight load swim test on trained mice. ACWS was orally administered at doses of 50mg/kg, 100mg/kg and 200mg/kg for 28 days...
November 17, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29157784/deriving-muscle-fiber-diameter-from-recorded-single-fiber-potential
#6
Ewa Zalewska
OBJECTIVE: The aim of the study was to estimate muscle fiber diameters through analysis of single muscle fiber potentials (SFPs) recorded in the frontalis muscle of a healthy subject. METHODS: Our previously developed analytical and graphic method to derive fiber diameter from the analysis of the negative peak duration and the amplitude of SFP, was applied to a sample of ten SFPs recorded in vivo. RESULTS: Muscle fiber diameters derived from the simulation method for the sample of frontalis muscle SFPs are consistent with anatomical data for this muscle...
November 17, 2017: Neurophysiologie Clinique, Clinical Neurophysiology
https://www.readbyqxmd.com/read/29156093/functional-and-molecular-outcomes-of-the-human-masticatory-muscles
#7
REVIEW
Gaetano Isola, Giuseppe Anastasi, Giovanni Matarese, Ray C Williams, Giuseppina Cutroneo, Pietro Bracco, Maria Grazia Piancino
The masticatory muscles achieve a broad range of different activities such as chewing, sucking, swallowing and speech. In order to accomplish these duties, masticatory muscles have a unique and heterogeneous structure and fibre composition, enabling them to produce their strength and contraction speed largely dependent on their motor units and myosin proteins that can change in response to genetic and environmental factors. Human masticatory muscles express unique myosin isoforms, including a combination of thick fibers, expressing myosin light chains (MyLC) and myosin class I and II heavy chains (MyHC) -IIA, -IIX, α-cardiac, embryonic and neonatal and thin fibers, respectively...
November 20, 2017: Oral Diseases
https://www.readbyqxmd.com/read/29155791/improved-protocol-for-chromatin-immunoprecipitation-from-mouse-skeletal-muscle
#8
Shilpy Joshi, Vanessa Ueberschlag-Pitiot, Daniel Metzger, Irwin Davidson
We describe an efficient and reproducible protocol for the preparation of chromatin from adult mouse skeletal muscle, a physically resistant tissue with a high content of structural proteins. Dissected limb muscles from adult mice are physically disrupted by mechanical homogenisation, or a combination of mincing and douncing, in a hypotonic buffer before formaldehyde fixation of the cell lysate. The fixed nuclei are purified by further cycles of mechanical homogenisation or douncing and sequential filtrations to remove cell debris...
November 6, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29154979/small-fiber-neuropathy-diagnosis-causes-and-treatment
#9
Damien Sène
Small fiber neuropathy, which affects the sensory A≏ and C fibers, is now a major diagnostic and therapeutic challenge. Nearly 7% of the general population have chronic neuropathic pain responsible for severe quality-of-life impairments. Awareness must therefore be raised among clinicians of the somatosensory and autonomic symptoms that can reveal small fiber neuropathy, appropriate diagnostic investigations, most common causes, and best treatment options for each patient profile. To help achieve this goal, the present review article discusses the clinical presentation of neuropathic pain and paresthesia and/or autonomic dysfunction due to involvement of nerves supplying exocrine glands and smooth muscle; normal findings from standard electrophysiological investigations; most informative diagnostic tests (epidermal nerve fiber density in a skin biopsy, laser-evoked potentials, heat- and cold-detection thresholds, electrochemical skin conductance); main causes, which consist chiefly of metabolic diseases (diabetes mellitus, glucose intolerance), dysimmunity syndromes (Sjögren's syndrome, sarcoidosis, monoclonal gammopathy), and genetic abnormalities (familial amyloidosis due to a transthyretin mutation, Fabry disease, sodium channel diseases); and the available symptomatic and etiological treatments...
November 15, 2017: Joint, Bone, Spine: Revue du Rhumatisme
https://www.readbyqxmd.com/read/29154423/the-contractile-adaption-to-preload-depends-on-the-amount-of-afterload
#10
Hanna Schotola, Samuel T Sossalla, André Renner, Jan Gummert, Bernhard C Danner, Peter Schott, Karl Toischer
AIMS: The Frank-Starling mechanism (rapid response (RR)) and the secondary slow response (SR) are known to contribute to increases contractile performance. The contractility of the heart muscle is influenced by pre-load and after-load. Because of the effect of pre-load vs. after-load on these mechanisms in not completely understood, we studied the effect in isolated muscle strips. METHODS AND RESULTS: Progressive stretch lead to an increase in shortening/force development under isotonic (only pre-load) and isometric conditions (pre- and after-load)...
November 2017: ESC Heart Failure
https://www.readbyqxmd.com/read/29153706/load-sharing-in-the-lumbosacral-spine-in-neutral-standing-flexed-postures-a-combined-finite-element-and-inverse-static-study
#11
Tao Liu, Kinda Khalaf, Sadegh Naserkhaki, Marwan El-Rich
Understanding load-sharing in the spine during in-vivo conditions is critical for better spinal implant design and testing. Previous studies of load-sharing that considered actual spinal geometry applied compressive follower load, with or without moment, to simulate muscle forces. Other studies used musculoskeletal models, which include muscle forces, but model the discs by simple beams or spherical joints and ignore the articular facet joints. This study investigated load-sharing in neutral standing and flexed postures using a detailed Finite Element (FE) model of the ligamentous lumbosacral spine, where muscle forces, gravity loads and intra-abdominal pressure, as predicted by a musculoskeletal model of the upper body, are input into the FE model...
November 6, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29151827/tumor-necrosis-factor-like-weak-inducer-of-apoptosis-regulates-quadriceps-muscle-atrophy-and-fiber-type-alteration-in-a-rat-model-of-chronic-obstructive-pulmonary-disease
#12
Jun-Juan Lu, Qing Wang, Li Hua Xie, Qiang Zhang, Sheng Hua Sun
Background: In chronic obstructive pulmonary disease (COPD), weakness and muscle mass loss of the quadriceps muscle has been demonstrated to predict survival and mortality rates of patients. Tumor necrosis factor (TNF)-like weak inducer of apoptosis (TWEAK), as a member of the TNF superfamily, has recently been identified as a key regulator of skeletal muscle wasting and metabolic dysfunction. So our aim was to study the role of TWEAK during quadriceps muscle atrophy and fiber-type transformation in COPD model rats and its possible pathway...
2017: Tobacco Induced Diseases
https://www.readbyqxmd.com/read/29151592/diet-resistant-obesity-is-characterized-by-a-distinct-plasma-proteomic-signature-and-impaired-muscle-fiber-metabolism
#13
A B Thrush, G Antoun, M Nikpay, D A Patten, C DeVlugt, J-F Mauger, B L Beauchamp, P Lau, R Reshke, É Doucet, P Imbeault, R Boushel, D Gibbings, J Hager, A Valsesia, R Slack, O Y Al-Dirbashi, R Dent, R McPherson, M-E Harper
BACKGROUND/OBJECT: Inter-individual variability in weight loss during obesity treatment is complex and poorly understood. Here we use whole body and tissue approaches to investigate fuel oxidation characteristics in skeletal muscle fibers, cells, and distinct circulating protein biomarkers before and after a high fat meal (HFM) challenge in those who lost the most (obese diet-sensitive; ODS), vs the least (obese diet-resistant; ODR) amount of weight in a highly controlled weight management program...
November 20, 2017: International Journal of Obesity: Journal of the International Association for the Study of Obesity
https://www.readbyqxmd.com/read/29150079/mechanism-hypotheses-for-the-electrophysiological-manifestations-of-two-cases-of-endplate-acetylcholinesterase-deficiency-related-congenital-myasthenic-syndrome
#14
Qingyun Ding, Dongchao Shen, Yi Dai, Youfang Hu, Yuzhou Guan, Mingsheng Liu, Liying Cui
OBJECTIVE: To summarize the electrophysiological characteristics of two cases of endplate acetylcholinesterase deficiency (EAD) related congenital myasthenic syndrome (CMS) caused by COLQ mutation and to discuss the possible mechanism of these electrophysiological phenomena. METHODS: Electrophysiological examinations were conducted including nerve conduction studies, routine electromyography (EMG), repetitive nerve stimulation (RNS) and single fiber EMG (SFEMG)...
November 14, 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/29147923/anti-aminoacyl-trna-synthetase-related-myositis-and-dermatomyositis-clues-for-differential-diagnosis-on-muscle-biopsy
#15
Bruna Cerbelli, Annalinda Pisano, Serena Colafrancesco, Maria Gemma Pignataro, Marco Biffoni, Silvia Berni, Antonia De Luca, Valeria Riccieri, Roberta Priori, Guido Valesini, Giulia d'Amati, Carla Giordano
Anti-synthetase syndrome is an autoimmune disease characterized by autoantibodies toward amino acyl-tRNA synthetases (ARS), anti-Jo 1 being the most commonly detected. Muscle damage develops in up to 90% of ARS-positive patients, characterized by a necrotizing myositis restricted to the perifascicular region. This topographic distribution of muscle damage may lead to a misdiagnosis of dermatomyositis (DM) at muscle biopsy. We compared morphological, immunohistochemical, and histoenzymatic features of muscle from ARS-positive patients (n = 11) with those of DM (n = 7) providing clues for their differential diagnosis...
November 16, 2017: Virchows Archiv: An International Journal of Pathology
https://www.readbyqxmd.com/read/29147102/the-relationships-between-muscle-fiber-characteristics-intramuscular-fat-content-and-fatty-acid-compositions-in-m-longissimus-lumborum-of-hanwoo-steers
#16
Seon-Tea Joo, Sung-Hyun Joo, Young-Hwa Hwang
The objective of this study was to investigate the relationship between muscle fiber characteristics, intramuscular fat (IMF) content, and fatty acids composition in longissimus lumborum (LL) muscle from Hanwoo steers. The LL muscles were obtained from four quality grades (QG) carcasses and subjected to histochemical analysis. There were significant (p<0.05) differences in fiber number percentage (FNP) and fiber area percentage (FAP) of muscle fiber types among muscles from four QGs. Both FNP and FAP of type I increased while those of type IIB decreased with increasing QG from QG 2 to QG 1(++) (p<0...
2017: Korean Journal for Food Science of Animal Resources
https://www.readbyqxmd.com/read/29147095/histochemical-characteristics-in-relation-to-meat-quality-traits-of-eight-major-muscles-from-hanwoo-steers
#17
Sung-Hyun Joo, Kyu-Won Lee, Young-Hwa Hwang, Seon-Tea Joo
The objective of this study was to determine the relationship between composition of muscle fiber types and meat quality traits of eight major muscles from Hanwoo steers. Longissimus lumborum (LL), psoas major (PM), semimembranosus (SM), semitendinosus (ST), gluteus medius (GM), triceps brachii (TB), rectus abdominis (RA) and superficialis flexor (SF) muscles were obtained from 9 Hanwoo steers and subjected to histochemical analysis. There were significant (p<0.05) differences in fiber number percentage (FNP) and fiber area percentage (FAP) of fiber types among these 8 major muscles...
2017: Korean Journal for Food Science of Animal Resources
https://www.readbyqxmd.com/read/29146687/exercise-induces-muscle-fiber-type-switching-via-transient-receptor-potential-melastatin-2-trpm2-dependent-ca-2-signaling
#18
Seo-Ho Lee, Byung-Ju Kim, Dae-Ryoung Park, Uh-Hyun Kim
The aim of the present study was to examine whether transient receptor potential melastatin 2 (TRPM2) plays a role in muscle fiber type transition during exercise. Mice were trained at a speed of 12 m/min at a slope of 0 ° for 60 min 5 consecutive d/wk for 4-wk. Exhaustion tests were performed on the treadmill (the speed was set at 6 m/min at a slope of 0° and increased at a rate of 1 m/min every 6 min). Isolated primary skeletal muscle cells from TRPM2 knockout (KO) mice showed lower amplitudes of electrical stimuli (ES)-induced Ca(2+) signals when compared to wild-type (WT) mice, due to a defect in Ca(2+) influx...
November 16, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29146092/ultrasonographic-evaluation-of-changes-in-the-muscle-architecture-of-the-gastrocnemius-with-botulinum-toxin-treatment-for-lower-extremity-spasticity-in-children-with-cerebral-palsy
#19
Akihiro Kawano, Taiichiro Yanagizono, Ichiro Kadouchi, Tetsuya Umezaki, Etsuo Chosa
BACKGROUND: Botulinum toxin A treatment involves injecting botulinum toxin A to relax muscle spasticity. Using ultrasonography, this study examined changes in the muscle architecture before and after treatment to evaluate the influence of botulinum toxin A injection on muscles. METHODS: The participants included 18 children (mean age, 6.2 years) with cerebral palsy who were treated with botulinum toxin A for lower extremity spasticity and 27 healthy children (mean age, 6...
November 13, 2017: Journal of Orthopaedic Science: Official Journal of the Japanese Orthopaedic Association
https://www.readbyqxmd.com/read/29145886/are-mice-good-models-for-human-neuromuscular-disease-comparing-muscle-excursions-in-walking-between-mice-and-humans
#20
Xiao Hu, James P Charles, Turgay Akay, John R Hutchinson, Silvia S Blemker
BACKGROUND: The mouse is one of the most widely used animal models to study neuromuscular diseases and test new therapeutic strategies. However, findings from successful pre-clinical studies using mouse models frequently fail to translate to humans due to various factors. Differences in muscle function between the two species could be crucial but often have been overlooked. The purpose of this study was to evaluate and compare muscle excursions in walking between mice and humans. METHODS: Recently published musculoskeletal models of the mouse hindlimb and human lower limb were used to simulate muscle-tendon dynamics during mouse and human walking, a key daily activity...
November 16, 2017: Skeletal Muscle
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