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Muscle atrophy

Soh Youn Suh, Robert A Clark, Alan Le, Joseph L Demer
Purpose: To investigate changes in volumes of extraocular muscle (EOM) compartments in unilateral superior oblique (SO) palsy using magnetic resonance imaging (MRI). Methods: High-resolution, surface-coil MRI was obtained in 19 patients with unilateral SO palsy and 19 age-matched orthotropic control subjects. Rectus EOMs and the SO were divided into two anatomic compartments for volume analysis in patients with unilateral SO palsy, allowing comparison of total compartmental volumes versus controls...
October 1, 2016: Investigative Ophthalmology & Visual Science
Lorenza Brocca, Luana Toniolo, Carlo Reggiani, Roberto Bottinelli, Marco Sandri, Maria Antonietta Pellegrino
Muscle atrophy is a complex process that is in common with many different catabolic diseases including disuse/inactivity and ageing. The signalling pathways that control the atrophy program in the different disuse/inactivity conditions have not yet been completely dissected. It has been recently reported that inhibition of FoxO only partially spared muscle mass after denervation. The purposes of this study were: (i) to determine the involvement of FoxOs in hindlimb suspension disuse model, (ii) to define whether the molecular events of protein breakdown are shared among different unloaded muscles and finally (iii) to compare the data obtained in this model with another model of inactivity such as denervation...
October 21, 2016: Journal of Physiology
Yonghui Yu, Xiao Li, Lingying Liu, Jiake Chai, Zhang Haijun, Wanli Chu, Huinan Yin, Li Ma, Hongjie Duan, Mengjing Xiao
Skeletal muscle atrophy is a common clinical feature among patients with severe burns. Previous studies have shown that miRNAs play critical roles in the regulation of stress-induced skeletal muscle atrophy. Our previous study showed that burn-induced skeletal muscle atrophy is mediated by miR-628. In this study, compared with sham rats, rats subjected to burn injury exhibited skeletal muscle atrophy, as well as significantly decreased insulin receptor substrate 1 (IRS1) protein expression and significantly increased skeletal muscle cell apoptosis...
2016: International Journal of Biological Sciences
Akira Ikumi, Shigeki Kubota, Yukiyo Shimizu, Hideki Kadone, Aiki Marushima, Tomoyuki Ueno, Hiroaki Kawamoto, Yasushi Hada, Akira Matsumura, Yoshiyuki Sankai, Masashi Yamazaki
CONTEXT: Recently, locomotor training with robotic assistance has been found effective in treating spinal cord injury (SCI). Our case report examined locomotor training using the robotic suit hybrid assistive limb (HAL) in a patient with complete C4 quadriplegia due to chronic SCI. This is the first report examining HAL in complete C4 quadriplegia. FINDINGS: The patient was a 19-year-old man who dislocated C3/4 during judo 4 years previously. Following the injury, he underwent C3/4 posterior spinal fusion but remained paralyzed despite rehabilitation...
October 20, 2016: Journal of Spinal Cord Medicine
Alan Pestronk, Richard Keeling, Rati Choksi
OBJECTIVE: We studied mitochondrial impairment as a factor in the pathologic equivalent of sarcopenia, muscle fiber atrophy associated with increased age. METHODS: Mitochondrial oxidative enzyme activities and coenzyme Q10 levels were measured in frozen human proximal limb muscles with combined age and atrophy, age alone, atrophy alone, denervation, immune myopathies, and mitochondrial disorders with ophthalmoplegia. RESULTS: Sarcopenia (age and atrophy) had reduced mean activities of mitochondrial Complexes I, II, and II+III, with severe reduction of Complex I activity in 54% of patients...
October 19, 2016: Muscle & Nerve
Robert M Kwee, Shivani Ahlawat, Jan Fritz
OBJECTIVE: To determine the frequency of magnetic resonance imaging (MRI) findings of ischiofemoral impingement (IFI) in patients with inflammatory myositis (IM) and associated factors. METHODS: Pelvis and thigh MRI studies of 314 consecutive patients (57% women; mean age, 55.5 years; range, 18-85) with suspected muscle disease were reviewed. RESULTS: Ischiofemoral impingement at MRI was present in 11% of patients with a final diagnosis of IM and in 2% of patients with an alternative diagnosis (P = 0...
October 18, 2016: Journal of Computer Assisted Tomography
Kelechi R Okoroha, Nima Mehran, Jonathan Duncan, Travis Washington, Tyler Spiering, Michael J Bey, Marnix Van Holsbeeck, Vasilios Moutzouros
Ultrasound and magnetic resonance imaging (MRI) are both capable of diagnosing full-thickness rotator cuff tears. However, it is unknown which imaging modality is more accurate and precise in evaluating the characteristics of full-thickness rotator cuff tears in a surgical population. This study reviewed 114 patients who underwent arthroscopic repair of a full-thickness rotator cuff tear over a 1-year period. Of these patients, 61 had both preoperative MRI and ultrasound for review. Three musculoskeletal radiologists evaluated each ultrasound and MRI in a randomized and blinded fashion on 2 separate occasions...
October 18, 2016: Orthopedics
Mustafa Sancar Ataç, Yeliz Kilinç
The bony augmentation of severely atrophied mandible is generally required for the purposes of prosthetic rehabilitations. The treatment strategies have been well defined in the literature ranging from osteotomy techniques to distraction osteogenesis. Visor osteotomy is the milestone of the reconstructive surgery for the atrophied mandible which has received some modifications. In the present study, the authors describe a new modification of visor osteotomy in which a complete coronal split osteotomy down to the inferior border at the mental region has been performed...
October 14, 2016: Journal of Craniofacial Surgery
Koki Takane, Yu Hasegawa, Lin Bowen, Takashi Yokoo, Shokei Kim-Mitsuyama
OBJECTIVE: Increasing evidences suggest that patients with Alzheimer's disease (AD) show not only cognitive impairment but also physical disorder including cardiac dysfunction and sarcopenia. In this study, we investigated whether central angiotensin II, inducer of oxidative stress, led to the organ dysfunction in a mouse model of AD. DESIGN AND METHOD: 5XFAD which is an animal model of AD and C57BL/6 (WT) were each assigned to 1) normal saline and 2) angiotensin II (20 mg/kg/h) groups...
September 2016: Journal of Hypertension
Alon Abraham, Aaron Izenberg, Dubravka Dodig, Vera Bril, Ari Breiner
INTRODUCTION: Neuralgic amyotrophy (NA) is characterized by acute or subacute onset of shoulder and arm pain, followed by muscle atrophy and weakness, and variable sensory abnormalities. Historically, the site of inflammation has been localized to the brachial plexus, although involvement of individual nerve branches has been well recognized. METHODS: We describe ultrasound (US) findings in 2 cases with clinical presentation suggestive for NA, involving individual peripheral nerves, correlating with clinical and electrophysiological findings...
June 13, 2016: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
Y M Zheng, W Z Li, Z X Wang, W Zhang, H Lv, J X Xiao, Y Yuan
OBJECTIVE: To report thigh muscle magnetic resonance imaging (MRI) tests of four Chinese patients with dystrophinopathy with edema changes in adductor longus muscles that mimics adductor enthesopathy. METHODS: Four boys, who were from four unrelated families and aged from 5 to 11 years, were investigated because of the clinical manifestations including myalgia or muscle weakness or the incidental findings of elevated serum creatine kinase levels, and were diagnosed with dystrophinopathy by gene test of Duchenne muscular dystrophy (DMD)...
October 18, 2016: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
Alon Abraham, Aaron Izenberg, Dubravka Dodig, Vera Bril, Ari Breiner
PURPOSE: Neuralgic amyotrophy is characterized by acute or subacute onset of shoulder and arm pain, followed by muscle atrophy and weakness, and variable sensory abnormalities. Historically, the site of inflammation has been localized to the brachial plexus, although the involvement of individual nerve branches has been well recognized. METHODS: We describe ultrasound findings in two cases with a clinical presentation suggestive of neuralgic amyotrophy, involving individual peripheral nerves, correlating with clinical and electrophysiological findings...
October 2016: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
Owen M Slater, Jeanine Peters-Kennedy, Manigandan Lejeune, David Gummer, Bryan Macbeth, Amy Warren, Tomy Joseph, Hong Li, Cristina W Cunha, Pádraig J Duignan
Malignant catarrhal fever-like clinical disease was diagnosed in a free-ranging bighorn sheep ( Ovis canadensis ) from Alberta, Canada, in June 2015. Antemortem and gross pathology findings included muscle atrophy, marked weight loss, and bilaterally symmetric alopecia with hyperpigmentation and crusting over the face, medial surfaces of the pinnae, dorsal trunk, distal limbs, perineal area, and tail. Histologically, the skin lesions were characterized by granulomatous mural folliculitis with numerous multinucleated giant cells and fewer lymphocytes and eosinophils consistent with previous reports of chronic ovine herpesvirus-2 (OvHV-2) infection...
October 17, 2016: Journal of Wildlife Diseases
Bipradas Roy, Mary E Curtis, Letimicia S Fears, Samuel N Nahashon, Hugh M Fentress
Obesity and osteoporosis are two alarming health disorders prominent among middle and old age populations, and the numbers of those affected by these two disorders are increasing. It is estimated that more than 600 million adults are obese and over 200 million people have osteoporosis worldwide. Interestingly, both of these abnormalities share some common features including a genetic predisposition, and a common origin: bone marrow mesenchymal stromal cells. Obesity is characterized by the expression of leptin, adiponectin, interleukin 6 (IL-6), interleukin 10 (IL-10), monocyte chemotactic protein-1 (MCP-1), tumor necrosis factor-alpha (TNF-α), macrophage colony stimulating factor (M-CSF), growth hormone (GH), parathyroid hormone (PTH), angiotensin II (Ang II), 5-hydroxy-tryptamine (5-HT), Advance glycation end products (AGE), and myostatin, which exert their effects by modulating the signaling pathways within bone and muscle...
2016: Frontiers in Physiology
Brady K Huang, Eric Y Chang
OBJECTIVE: To describe infraspinatus tendon injuries with associated intramuscular edema in light of more recently elucidated anatomical knowledge. MATERIAL AND METHODS: A retrospective review was performed to identify MRI cases with infraspinatus tendon injury accompanied by muscle edema. MR images were reviewed to evaluate the location of the injury, to assess the degree of tendon retraction, and to assess for muscular changes. Clinical and surgical data were reviewed when available...
October 14, 2016: Skeletal Radiology
Gommaar D'Hulst, Louise Deldicque
Skeletal muscle wasting has been shown to be a mechanism by which humans are able to adapt to extreme altitude. Nonetheless, the literature is conflicting regarding the altitude or time point at which this phenomenon starts to occur. Using the metric recently suggested by Garvivan-Lewis et al. (8), we propose an hypoxic dose of 5000 km·h as the cut-off point above which hypoxia-induced muscle atrophy starts to develop. As such, we suggest that both elevation and hours of altitude exposure should be incorporated in future studies unraveling hypoxic regulation of muscle mass...
October 14, 2016: Journal of Applied Physiology
Gianni Biolo, Rado Pišot, Sara Mazzucco, Filippo Giorgio Di Girolamo, Roberta Situlin, Stefano Lazzer, Bruno Grassi, Carlo Reggiani, Angelina Passaro, Joern Rittweger, Mladen Gasparini, Boštjan Šimunič, Marco Narici
BACKGROUND & AIMS: Aging and experimental bed rest are associated with muscle atrophy and resistance to post-prandial stimulation of protein synthesis or anabolic resistance (AR). We have used in young and older adult volunteers, during short-term bed rest, a quick and non-invasive method, based on a single oral bolus of the stable isotope L[ring-(2)H5]phenylalanine (D5Phe), to determine post-prandial AR, defined as ratio between irreversible hydroxylation and incorporation into body protein of ingested phenylalanine...
September 30, 2016: Clinical Nutrition: Official Journal of the European Society of Parenteral and Enteral Nutrition
Xu Zhang, Qianni Cheng, Yixiang Wang, Po Sing Leung, Kinglun Kingston Mak
Bone plays a role in energy metabolism, but the interplay between bone and other organs in this process is not completely understood. Here, we show that upregulated Hh signaling in bones results in increased whole-body energy expenditure, white adipose tissue (WAT) browning, hypoglycemia and skeletal muscle atrophy. We found that Hh signaling induces PTHrP secretion from bones and causes WAT browning. Injection of PTHrP-neutralizing antibody attenuates WAT browning and improves the circulating blood glucose level while high-fat diet treatment only rescues hypoglycemia...
October 14, 2016: Cell Death and Differentiation
Annalisa Bonifacio, Gerda M Sanvee, Karin Brecht, Denise V Kratschmar, Alex Odermatt, Jamal Bouitbir, Stephan Krähenbühl
Statins are generally well tolerated, but treatment with these drugs may be associated with myopathy. The mechanisms of statin-associated myopathy are not completely understood. Statins inhibit AKT phosphorylation by an unclear mechanism, whereas insulin-like growth factor (IGF-1) activates the IGF-1/AKT signaling pathway and promotes muscle growth. The aims of the study were to investigate mechanisms of impaired AKT phosphorylation by simvastatin and to assess effects of IGF-1 on simvastatin-induced myotoxicity in C2C12 myotubes...
October 12, 2016: Archives of Toxicology
Svitlana Pasteuning-Vuhman, Johanna Boertje-van der Meulen, Maaike van Putten, Maurice Overzier, Peter Ten Dijke, Szymon M Kiełbasa, Wibowo Arindrarto, Ron Wolterbeek, Ksenia V Lezhnina, Ivan V Ozerov, Aleksandr M Aliper, Willem M Hoogaars, Annemieke Aartsma-Rus, Cindy J M Loomans
Skeletal muscle fibrosis and impaired muscle regeneration are major contributors to muscle wasting in Duchenne muscular dystrophy (DMD). Muscle growth is negatively regulated by myostatin (MSTN) and activins. Blockage of these pathways may improve muscle quality and function in DMD. Antisense oligonucleotides (AONs) were designed specifically to block the function of ALK4, a key receptor for the MSTN/activin pathway in skeletal muscle. AON-induced exon skipping resulted in specific Alk4 down-regulation, inhibition of MSTN activity, and increased myoblast differentiation in vitro Unexpectedly, a marked decrease in muscle mass (10%) was found after Alk4 AON treatment in mdx mice...
October 12, 2016: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
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