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Neuromuscular junction

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https://www.readbyqxmd.com/read/27913592/complexin-mutants-reveal-partial-segregation-between-recycling-pathways-that-drive-evoked-and-spontaneous-neurotransmission
#1
Nadezhda Sabeva, Richard W Cho, Alexander Vasin, Agustin Gonzalez, J Troy Littleton, Maria Bykhovskaia
: Synaptic vesicles fuse at morphological specializations in the presynaptic terminal termed active zones (AZs). Vesicle fusion can occur spontaneously or in response to an action potential. Following fusion, vesicles are retrieved and recycled within nerve terminals. It is still unclear whether vesicles that fuse spontaneously or following evoked release share similar recycling mechanisms. Genetic deletion of the SNARE-binding protein complexin dramatically increases spontaneous fusion, with the protein serving as the synaptic vesicle fusion clamp at Drosophila synapses...
December 2, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/27906081/vacht-overexpression-increases-acetylcholine-at-the-synaptic-cleft-and-accelerates-aging-of-neuromuscular-junctions
#2
Satoshi Sugita, Leland L Fleming, Caleb Wood, Sydney K Vaughan, Matheus P S M Gomes, Wallace Camargo, Ligia A Naves, Vania F Prado, Marco A M Prado, Cristina Guatimosim, Gregorio Valdez
BACKGROUND: Cholinergic dysfunction occurs during aging and in a variety of diseases, including amyotrophic lateral sclerosis (ALS). However, it remains unknown whether changes in cholinergic transmission contributes to age- and disease-related degeneration of the motor system. Here we investigated the effect of moderately increasing levels of synaptic acetylcholine (ACh) on the neuromuscular junction (NMJ), muscle fibers, and motor neurons during development and aging and in a mouse model for amyotrophic lateral sclerosis (ALS)...
October 5, 2016: Skeletal Muscle
https://www.readbyqxmd.com/read/27890878/prevalence-of-electrocardiographic-abnormalities-in-patients-with-myasthenia-gravis
#3
Jun Tsugawa, Masahiro Ogawa, Shinji Ouma, Jiro Fukae, Yoshio Tsuboi
OBJECTIVE: Myasthenia gravis (MG) is an immunological disorder of the neuromuscular junction, characterized by easy fatigability and weakness of the skeletal muscles. However, it has sometimes been reported that heart diseases including cardiomyopathies leading to sudden death have been observed in patients with MG. We studied the prevalence of electrocardiographic (ECG) abnormalities and heart disease in patients newly diagnosed with MG who had not received immunotherapy. METHODS: Fifty-three patients with MG were enrolled in our study...
November 25, 2016: Rinshō Shinkeigaku, Clinical Neurology
https://www.readbyqxmd.com/read/27886889/update-on-ocular-myasthenia-gravis
#4
REVIEW
Stacy V Smith, Andrew G Lee
Ocular myasthenia gravis (OMG) is a localized form of myasthenia gravis in which autoantibodies directed against acetylcholine receptors block or destroy these receptors at the postsynaptic neuromuscular junction. The hallmark of OMG is a history of painless weakness or fatigability of the extraocular muscles and ptosis with normal pupillary function and visual acuity. Clinical, laboratory, electrophysiologic, and pharmacologic tests are available for diagnosis. Treatment can begin with symptom management; there is no cure...
February 2017: Neurologic Clinics
https://www.readbyqxmd.com/read/27883899/cut-your-losses-spastin-mediates-branch-specific-axon-loss
#5
Hagar Meltzer, Oren Schuldiner
In this issue of Neuron, Brill et al. (2016) demonstrate that, during synapse elimination in the developing neuromuscular junction, branch-specific microtubule destabilization results in arrested axonal transport and induces axon branch loss. This process is mediated in part by the neurodegeneration-associated, microtubule-severing protein spastin.
November 23, 2016: Neuron
https://www.readbyqxmd.com/read/27881401/alterations-of-colonic-function-in-the-winnie-mouse-model-of-spontaneous-chronic-colitis
#6
Ainsley M Robinson, Ahmed A Rahman, Simona Elisa Carbone, Sarron Randall-Demllo, Rhiannon Filippone, Joel Charles Bornstein, Rajaraman Eri, Kulmira Nurgali
The Winnie mouse, carrying a missense mutation in Muc2, is a model for chronic intestinal inflammation demonstrating symptoms closely resembling inflammatory bowel disease (IBD). Alterations to the immune environment, morphological structure and innervation of Winnie mouse colon have been identified; however analyses of intestinal transit and colonic functions have not been conducted. In this study, we investigated in vivo intestinal transit in radiographic studies and in vitro motility of the isolated colon in organ bath experiments...
November 23, 2016: American Journal of Physiology. Gastrointestinal and Liver Physiology
https://www.readbyqxmd.com/read/27870893/activin-receptor-type-iib-inhibition-improves-muscle-phenotype-and-function-in-a-mouse-model-of-spinal-muscular-atrophy
#7
Min Liu, David W Hammers, Elisabeth R Barton, H Lee Sweeney
Spinal muscular atrophy (SMA) is a devastating neurodegenerative disorder that causes progressive muscle atrophy and weakness. Using adeno-associated virus-mediated gene transfer, we evaluated the potential to improve skeletal muscle weakness via systemic, postnatal inhibition of either myostatin or all signaling via the activin receptor type IIB (ActRIIB). After demonstrating elevated p-SMAD3 content and differential content of ActRIIB ligands, 4-week-old male C/C SMA model mice were treated intraperitoneally with 1x1012 genome copies of pseudotype 2/8 virus encoding a soluble form of the ActRIIB extracellular domain (sActRIIB) or protease-resistant myostatin propeptide (dnMstn) driven by a liver specific promoter...
2016: PloS One
https://www.readbyqxmd.com/read/27863874/successful-autologous-haematopoietic-stem-cell-transplantation-for-refractory-myasthenia-gravis-a-case-report
#8
Irene Håkansson, Anna Sandstedt, Fredrik Lundin, Håkan Askmark, Ritva Pirskanen, Kristina Carlson, Fredrik Piehl, Hans Hägglund
Myasthenia gravis (MG) is an autoimmune disease, with immune reactivity against the post-synaptic endplate of the neuromuscular junction. Apart from symptomatic treatment with choline esterase blockers, many patients also require immunomodulatory treatment. Despite existing treatment options, some patients are treatment refractory. We describe a patient with severe MG refractory to corticosteroids, four oral immunosuppressants, cyclophosphamide, rituximab and bortezomib who was treated with autologous haematopoietic stem cell transplantation...
September 28, 2016: Neuromuscular Disorders: NMD
https://www.readbyqxmd.com/read/27863479/myasthenic-symptoms-in-anti-low-density-lipoprotein-receptor-related-protein-4-antibody-seropositive-amyotrophic-lateral-sclerosis-two-case-reports
#9
Hisashi Takahashi, Yu-Ichi Noto, Naoki Makita, Yukie Kushimura-Okada, Ryotaro Ishii, Akihiro Tanaka, Tomoyuki Ohara, Shunya Nakane, Osamu Higuchi, Masanori Nakagawa, Toshiki Mizuno
BACKGROUND: Myasthenic symptoms can be present in patients with amyotrophic lateral sclerosis (ALS). These symptoms have been considered to be caused by the degeneration of distal motor neurons and the neuromuscular junction (NMJ). Recent studies suggested that antibody to low-density lipoprotein receptor-related protein 4 (LRP4) was a pathogenic agent of myasthenia gravis (MG), and it was also detected in ALS patients. CASE PRESENTATION: Patient 1: A 58-year-old Japanese man developed progressive weakness and subsequent myasthenic symptoms including oculomotor disturbance...
November 18, 2016: BMC Neurology
https://www.readbyqxmd.com/read/27861229/what-s-in-the-literature
#10
Nicholas J Silvestri, Gil I Wolfe, David Lacomis
In this edition, we focus on neuromuscular junction disorders and myopathy. The newly published international consensus guidelines for the management of myasthenia gravis are reviewed. In addition, various emerging treatment options for myasthenia, including the use of methotrexate, rituximab, subcutaneous immunoglobulin, and thymectomy, are discussed. Recent studies examining the clinical and genetic features of several forms of congenital myasthenia gravis are also highlighted. The clinical features and treatment of late-onset Pompe disease are reviewed, as are studies in facioscapulohumeral dystrophy, idiopathic inflammatory myopathies, and calpainopathy...
December 2016: Journal of Clinical Neuromuscular Disease
https://www.readbyqxmd.com/read/27857121/guillain-barr%C3%A3-syndrome-a-century-of-progress
#11
REVIEW
John A Goodfellow, Hugh J Willison
In 1916, Guillain, Barré and Strohl reported on two cases of acute flaccid paralysis with high cerebrospinal fluid protein levels and normal cell counts - novel findings that identified the disease we now know as Guillain-Barré syndrome (GBS). 100 years on, we have made great progress with the clinical and pathological characterization of GBS. Early clinicopathological and animal studies indicated that GBS was an immune-mediated demyelinating disorder, and that severe GBS could result in secondary axonal injury; the current treatments of plasma exchange and intravenous immunoglobulin, which were developed in the 1980s, are based on this premise...
November 18, 2016: Nature Reviews. Neurology
https://www.readbyqxmd.com/read/27855736/glutamate-is-a-wake-active-neurotransmitter-in-drosophila-melanogaster
#12
John E Zimmerman, May T Chan, Olivia T Lenz, Brendan T Keenan, Greg Maislin, Allan I Pack
STUDY OBJECTIVES: In mammals, there is evidence that glutamate has a role as a wake active neurotransmitter. So using video-based analysis of Drosophila behavior we undertook a study to examine if glutamate, which has been previously shown to have an excitatory role in neuromuscular junctions in Drosophila, may have a conserved wake-active role in the adult brain. METHODS: Using 6-9 day old female flies we examined the effect of perturbations of the glutamatergic signaling on total wakefulness and wake bout architecture...
October 28, 2016: Sleep
https://www.readbyqxmd.com/read/27852784/activity-induces-fmr1-sensitive-synaptic-capture-of-anterograde-circulating-neuropeptide-vesicles
#13
Samantha L Cavolo, Dinara Bulgari, David L Deitcher, Edwin S Levitan
: Synaptic neuropeptide and neurotrophin stores are maintained by constitutive bidirectional capture of dense-core vesicles (DCVs) as they circulate in and out of the nerve terminal. Activity increases DCV capture to rapidly replenish synaptic neuropeptide stores following release. However, it is not known whether this is due to enhanced bidirectional capture. Here experiments at the Drosophila neuromuscular junction, where DCVs contain neuropeptides and a bone morphogenic protein, show that activity-dependent replenishment of synaptic neuropeptides following release is evident after inhibiting the retrograde transport with the dynactin disruptor mycalolide B or photobleaching DCVs entering a synaptic bouton by retrograde transport...
November 16, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/27848060/man1-restricts-bmp-signaling-during-synaptic-growth-in-drosophila
#14
Ulrike Laugks, Marie Hieke, Nicole Wagner
Bone morphogenic protein (BMP) signaling is crucial for coordinated synaptic growth and plasticity. Here, we show that the nuclear LEM-domain protein MAN1 is a negative regulator of synaptic growth at Drosophila larval and adult neuromuscular junctions (NMJs). Loss of MAN1 is associated with synaptic structural defects, including floating T-bars, membrane attachment defects, and accumulation of vesicles between perisynaptic membranes and membranes of the subsynaptic reticulum. In addition, MAN1 mutants accumulate more heterogeneously sized vesicles and multivesicular bodies in larval and adult synapses, the latter indicating that MAN1 may function in synaptic vesicle recycling and endosome-to-lysosome trafficking...
November 15, 2016: Cellular and Molecular Neurobiology
https://www.readbyqxmd.com/read/27843744/delayed-recovery-from-paralysis-associated-with-plasma-cholinesterase-deficiency
#15
Wenqin Zhou, Sheng Lv
INTRODUCTION: This case was to describe a patient presented a 6 h length of apnea associated with low cholinesterase activity. CASE DESCRIPTION: A 32 years old female patient (body weight 50 kg, height 160 cm) was admitted to the hospital for laparoscopy combined with hysteroscopy exploration. The preoperative interrogation revealed no significant personal or family history of adverse reaction to anesthetics. The patient was healthy, with no chronic or systemic disease...
2016: SpringerPlus
https://www.readbyqxmd.com/read/27826939/a-novel-iron-chelator-radical-scavenger-ameliorates-motor-dysfunction-and-improves-life-span-and-mitochondrial-biogenesis-in-sod1-g93a-als-mice
#16
Sagit Golko-Perez, Tamar Amit, Orit Bar-Am, Moussa B H Youdim, Orly Weinreb
The aim of the present study was to evaluate the therapeutic effect of the novel neuroprotective multitarget brain permeable monoamine oxidase inhibitor/iron chelating-radical scavenging drug, VAR10303 (VAR), co-administered with high-calorie/energy-supplemented diet (ced) in SOD1(G93A) transgenic amyotrophic lateral sclerosis (ALS) mice. Administration of VAR-ced was initiated after the appearance of disease symptoms (at day 88), as this regimen is comparable with the earliest time at which drug therapy could start in ALS patients...
November 8, 2016: Neurotoxicity Research
https://www.readbyqxmd.com/read/27813669/micrornas-and-the-evolution-of-insect-metamorphosis
#17
Xavier Belles
MicroRNAs (miRNAs) are involved in the regulation of a number of processes associated with metamorphosis, either in the less modified hemimetabolan mode or in the more modified holometabolan mode. The miR-100/let-7/miR-125 cluster has been studied extensively, especially in relation to wing morphogenesis in both hemimetabolan and holometabolan species. Other miRNAs also participate in wing morphogenesis, as well as in programmed cell and tissue death, neuromaturation, neuromuscular junction formation, and neuron cell fate determination, typically during the pupal stage of holometabolan species...
October 28, 2016: Annual Review of Entomology
https://www.readbyqxmd.com/read/27810937/deficiency-of-cpeb2-confined-chat-expression-in-the-dorsal-motor-nucleus-of-vagus-causes-hyperactivated-parasympathetic-signaling-associated-bronchoconstriction
#18
Yen-Ting Lai, Chun-Kuei Su, Si-Tse Jiang, Ya-Jen Chang, Alan Chuan-Ying Lai, Yi-Shuian Huang
: Cytoplasmic polyadenylation element binding protein 2 (CPEB2) is an RNA-binding protein and translational regulator. To understand the physiological function of CPEB2, we generated CPEB2 knockout (KO) mice and found that most died within 3 days after birth. CPEB2 is highly expressed in the brainstem, which controls vital functions like breathing. Whole-body plethysmography revealed that KO neonates had aberrant respiration with frequent apnea. Nevertheless, the morphology and function of respiratory rhythm generator and diaphragm neuromuscular junctions appeared normal...
November 3, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/27802489/prolongation-of-relaxation-time-in-extraocular-muscles-with-brain-derived-neurotrophic-factor-in-adult-rabbit
#19
Krysta R Nelson, Shanlee M Stevens, Linda K McLoon
Purpose: We tested the hypothesis that short-term treatment with brain derived neurotrophic factor (BDNF) would alter the contractile characteristics of rabbit extraocular muscle (EOM). Methods: One week after injections of BDNF in adult rabbit superior rectus muscles, twitch properties were determined in treated and control muscles in vitro. Muscles were also examined for changes in mean cross-sectional areas, neuromuscular junction size, and percent of myofibers expressing specific myosin heavy chain isoforms, and sarcoendoplasmic reticulum calcium ATPases (SERCA) 1 and 2...
October 1, 2016: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/27798141/fatigue-in-rapsyn-deficient-zebrafish-reflects-defective-transmitter-release
#20
Hua Wen, Jeffrey Michael Hubbard, Wei-Chun Wang, Paul Brehm
: Rapsyn-deficient myasthenic syndrome is characterized by a weakness in voluntary muscle contraction, a direct consequence of greatly reduced synaptic responses that result from poorly clustered acetylcholine receptors. As with other myasthenic syndromes, the general muscle weakness is also accompanied by use-dependent fatigue. Here, we used paired motor neuron target muscle patch-clamp recordings from a rapsyn-deficient mutant line of zebrafish to explore for the first time the mechanisms causal to fatigue...
October 19, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
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