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denervated muscle

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
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
Suma Babu, Erik P Pioro, Jianbo Li, Yuebing Li
INTRODUCTION: We compared the yield of limb and thoracic paraspinal muscles for revealing lower motor neuron (LMN) dysfunction on electromyography (EMG) in amyotrophic lateral sclerosis (ALS). METHODS: A retrospective review of 354 patients with clinically definite or probable ALS was performed. Seventeen limb muscles and thoracic paraspinal muscles were evaluated for the presence of both active and chronic denervation. RESULTS: Distal limb muscles showed the highest electrodiagnostic sensitivities of LMN dysfunction in ALS regardless of onset region and diagnostic certainty at the time of diagnosis...
October 19, 2016: Muscle & Nerve
M M C da Silva, R A Corcha, A M Oliveira da Silva, F J B Z Franco, J R de Souza Almeida, I F S F Boin
BACKGROUND: Patients in the immediate post-operative liver transplantation (LxT) period can develop respiratory and functional complications. In the postoperative months, these functions tend to improve. Nevertheless, there are few studies that evaluate precisely and specifically respiratory function in post-LxT long-term after surgery. The objective of the study was to describe the respiratory profile of patients 1 to 6 months after LxT, accompanied by LxT outpatients. METHODS: We included patients between 25 and 60 years old...
September 2016: Transplantation Proceedings
Stanislaw Sobotka, Jingming Chen, Themba Nyirenda, Liancai Mu
Background Our recent work has demonstrated that the native motor zone (NMZ) within a given skeletal muscle is the best site for muscle reinnervation. This study was designed to explore the outcomes of direct nerve implantation (DNI) into the NMZ of denervated sternomastoid (SM) muscle in a rat model. Methods The right SM muscle was experimentally denervated by transecting its innervating nerve. The proximal stump of the severed SM nerve was immediately implanted into a small muscle slit made in the NMZ of the muscle where denervated motor endplates were concentrated...
October 13, 2016: Journal of Reconstructive Microsurgery
Naohiko Okabe, Takashi Shiromoto, Naoyuki Himi, Feng Lu, Emi Maruyama-Nakamura, Kazuhiko Narita, Nobuhisa Iwachidou, Yoshiki Yagita, Osamu Miyamoto
Motor map reorganization is believed to be one mechanism underlying rehabilitation-induced functional recovery. Although the ipsilesional secondary motor area has been known to reorganize motor maps and contribute to rehabilitation-induced functional recovery, it is unknown how the secondary motor area is reorganized by rehabilitative training. In the present study, using skilled forelimb reaching tasks, we investigated neural network remodeling in the rat rostral forelimb area (RFA) of the secondary motor area during 4 weeks of rehabilitative training...
October 7, 2016: Neuroscience
Giovanni Nardo, Maria Chiara Trolese, Giuseppe de Vito, Roberta Cecchi, Nilo Riva, Giorgia Dina, Paul R Heath, Angelo Quattrini, Pamela J Shaw, Vincenzo Piazza, Caterina Bendotti
BACKGROUND: Increasing evidence suggests that the immune system has a beneficial role in the progression of amyotrophic lateral sclerosis (ALS) although the mechanism remains unclear. Recently, we demonstrated that motor neurons (MNs) of C57SOD1(G93A) mice with slow disease progression activate molecules classically involved in the cross-talk with the immune system. This happens a lot less in 129SvSOD1(G93A) mice which, while expressing the same amount of transgene, had faster disease progression and earlier axonal damage...
October 7, 2016: Journal of Neuroinflammation
Adam M Butensky, Leah P Gruss, Zachary L Gleit
BACKGROUND: A pseudohernia is an abdominal wall bulge that may be mistaken for a hernia but that lacks the disruption of the abdominal wall that characterizes a hernia. Thus, the natural history and treatment of this condition differ from those of a hernia. This is the first report of a pseudohernia due to cough-associated rib fracture. CASE PRESENTATION: A case of pseudohernia due to fractures of the 10(th) and 11(th) ribs in a 68-year-old white woman is presented...
October 1, 2016: Journal of Medical Case Reports
Krista J Spiller, Clark R Restrepo, Tahiyana Khan, Anna M Stieber, Linda K Kwong, John Q Trojanowski, Virginia M-Y Lee
In order to treat progressive paralysis in ALS patients, it is critical to develop a mouse that closely models human ALS in both pathology and also in the timing of these events. We have recently generated new TDP-43 bigenic mice (called rNLS8) with doxycycline (Dox)-suppressible expression of human TDP-43 (hTDP-43) harboring a defective nuclear localization signal (hTDP-43∆NLS) under the control of the NEFH promoter. Our previous studies characterized the pathology and disease course in young rNLS8 mice following induction of neuronal hTDP-43ΔNLS...
September 29, 2016: Acta Neuropathologica Communications
Elisa Giorgetti, Zhigang Yu, Jason P Chua, Ryosuke Shimamura, Lili Zhao, Fan Zhu, Sriram Venneti, Maria Pennuto, Yuanfang Guan, Gene Hung, Andrew P Lieberman
Spinal and bulbar muscular atrophy (SBMA), a progressive degenerative disorder, is caused by a CAG/glutamine expansion in the androgen receptor (polyQ AR). Recent studies demonstrate that skeletal muscle is an important site of toxicity that contributes to the SBMA phenotype. Here, we sought to identify critical pathways altered in muscle that underlie disease manifestations in AR113Q mice. This led to the unanticipated identification of gene expression changes affecting regulators of carbohydrate metabolism, similar to those triggered by denervation...
September 27, 2016: Cell Reports
Claire Mietton, Laurent Schaeffer, Nathalie Streichenberger, Vincent Cunin, Berrouz Kassai, Isabelle Poirot
OBJECTIVE: Botulinum toxin is one of the treatments available to treat spasticity in patients with cerebral palsy (CP) from 2 years of age. The long-term action of the toxin on the neuromuscular junction (NMJ) and muscle structure is still unknown. We formulated the hypothesis that repeated injections of botulinum toxin could modify muscle structure. The main aim of our 3-year monocentric descriptive study is to evaluate the long-term effect of repeated injections of botulinum toxin on the muscle and the neuromuscular junction in patients with CP...
September 2016: Annals of Physical and Rehabilitation Medicine
Sana Salah, Houda Migaou, Zied Belaaj, Soumaya Boudokhane, Anis Jellad, Abderrazak Abid, Zohra Ben Salah Frih
OBJECTIVE: Winging of the scapula has a variety of causes and a variable prognosis. It contributes to a disruption of the scapulohumeral rhythm with a decreased flexion and abduction of the upper extremity and a source of a considerable pain. This condition can affect the ability to perform activities of daily living. The most common cause of scapula winging is serratus anterior paralysis resulting from a lesion of the long thoracic nerve. The rupture of the muscle itself remains uncommon...
September 2016: Annals of Physical and Rehabilitation Medicine
Deanna Gigliotti, Jeff R S Leiter, Peter B MacDonald, Jason Peeler, Judy E Anderson
BACKGROUND: Rotator-cuff injury (RCI) is common and painful; even after surgery, joint stability and function may not recover. Relative contributions to atrophy from disuse, fibrosis, denervation, and satellite-cell responsiveness to activating stimuli are not known. METHODS AND FINDINGS: Potential contributions of denervation and disrupted satellite cell responses to growth signals were examined in supraspinatus (SS) and control (ipsilateral deltoid) muscles biopsied from participants with RCI (N = 27)...
2016: PloS One
Yu-Cheng Pei, Hsueh-Yu Li, Cheng-Lun Chen, Alice M K Wong, Pei-Chi Huang, Tuan-Jen Fang
OBJECTIVE: The detailed characteristics and prognosis of nonsurgery-related unilateral vocal fold paralysis (NSUVFP) are currently unclear. This study evaluated the extent of laryngeal nerve lesions and the individual characteristics for patients with NSUVFP. STUDY DESIGN: Retrospective, case series. METHODS: Patients with unilateral vocal fold paralysis (UVFP) were evaluated using videolaryngostroboscopy and quantitative laryngeal electromyography...
September 26, 2016: Laryngoscope
Gang Li, Qing-Shan Li, Wen-Bin Li, Jian Wei, Wen-Kai Chang, Zhi Chen, Hu-Yun Qiao, Ying-Wei Jia, Jiang-Hua Tian, Bing-Sheng Liang
Denervation often results in skeletal muscle atrophy. Different mechanisms seem to be involved in the determination between denervated slow and fast skeletal muscle atrophy. At the epigenetic level, miRNAs are thought to be highly involved in the pathophysiological progress of denervated muscles. We used miRNA microarrays to determine miRNA expression profiles from a typical slow muscle (soleus muscle) and a typical fast muscle (tibialis anterior muscle) at an early denervation stage in a rat model. Results showed that miR-206, miR-195, miR-23a, and miR-30e might be key factors in the transformation process from slow to fast muscle in denervated slow muscles...
August 2016: Neural Regeneration Research
G F Martínez, P Bianchimano, M M Brauer
Estrogen inhibits the growth and causes the degeneration (pruning) of sympathetic nerves supplying the rat myometrium. Previous cryoculture studies evidenced that substrate-bound signals contribute to diminish the ability of the estrogenized myometrium to support sympathetic nerve growth. Using electron microscopy, here we examined neurite-substrate interactions in myometrial cryocultures, observing that neurites grew associated to collagen fibrils present in the surface of the underlying cryosection. In addition, we assessed quantitatively the effects of estrogen on myometrial collagen organization in situ, using ovariectomized rats treated with estrogen and immature females undergoing puberty...
September 10, 2016: Autonomic Neuroscience: Basic & Clinical
Weeranut Phothong, Rungsima Wanitphakdeedecha, Phawin Keskool, Woraphong Manuskiatti
Botulinum toxin type A (BTX-A) is now extensively employed for cosmetic concerns. Upper face rejuvenation, including glabella frown lines and crow's feet lines, received FDA approval for cosmetic uses. However, other off-label uses for lower face conditions have been employed for texture and contouring purposes, including masseter hypertrophy and vertical banding of the neck. BTX-A for rejuvenation of the aging neck is an effective and popular treatment with high patient satisfaction rates. Alleviating the aging appearance of the neck by BTX-A is the result of denervation of hyperkinetic platysma...
September 16, 2016: Journal of Cosmetic Dermatology
Patrick Trévidic, Gisella Criollo-Lamilla
BACKGROUND: Platysma bands are one of the first signs of aging of the neck. Current theories suggest that these bands develop due to skin sagging followed by loss of muscle tone. Treatment strategies, therefore, aim to tighten skin and muscle. The aim of the present study was to demonstrate that platysma bands are due to muscular activity during the aging process and not secondary to skin sagging. This suggests a new approach to managing platysma bands. METHODS: A descriptive, prospective clinical study of 25 patients who presented with definitive, unilateral, facial palsy following otoneurosurgical treatment...
September 10, 2016: Plastic and Reconstructive Surgery
Sally Spendiff, Madhusudanarao Vuda, Gilles Gouspillou, Sudhakar Aare, Anna Perez, José A Morais, Robert T Jagoe, Marie-Eve Filion, Robin Glicksman, Sophia Kapchinsky, Norah MacMillan, Charlotte H Pion, Mylène Aubertin-Leheudre, Stefan Hettwer, José A Correa, Tanja Taivassalo, Russell T Hepple
Experimental denervation modulates mitochondrial function, where changes in both reactive oxygen species (ROS) and sensitivity to permeability transition are implicated in the resultant muscle atrophy. Notably, although denervation occurs sporadically in ageing muscle, its impact on ageing muscle mitochondria is unknown. As this information has important therapeutic implications concerning targeting the mitochondrion in ageing muscle, we examined mitochondrial function in skeletal muscle from four groups of humans, comprising two active (mean age 23...
September 13, 2016: Journal of Physiology
Neil G Simon, Yu-Ichi Noto, Craig M Zaidman
Skeletal muscle imaging is increasingly used as a complement to clinical and electrophysiological examination in neuromuscular disease. Ultrasound and MRI have developed as the modalities of choice, each with strengths and limitations. Characteristic changes of muscle denervation and myopathy are seen on imaging which may delineate the nature of the disease process or help guide muscle biopsy. Identifying patterns of muscle involvement in hereditary myopathies may inform genetic testing. This review discusses skeletal muscle imaging in neuromuscular disease focusing on practical applications of current and emerging ultrasound and MRI techniques...
November 2016: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
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