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https://www.readbyqxmd.com/read/27906497/neuroembryology
#1
REVIEW
Diana Darnell, Scott F Gilbert
How is it that some cells become neurons? And how is it that neurons become organized in the spinal cord and brain to allow us to walk and talk, to see, recall events in our lives, feel pain, keep our balance, and think? The cells that are specified to form the brain and spinal cord are originally located on the outside surface of the embryo. They loop inward to form the neural tube in a process called neurulation. Structures that are nearby send signals to the posterior neural tube to form and pattern the spinal cord so that the dorsal side receives sensory input and the ventral side sends motor signals from neurons to muscles...
December 1, 2016: Wiley Interdisciplinary Reviews. Developmental Biology
https://www.readbyqxmd.com/read/27906462/histopathological-evaluation-of-skeletal-muscle-with-specific-reference-to-mouse-models-of-muscular-dystrophy
#2
Rebecca L Terry, Dominic J Wells
The muscular dystrophies are a diverse group of degenerative diseases for which many mouse models are available. These models are frequently used to assess potential therapeutic interventions and histological evaluation of multiple muscles is an important part of this assessment. Histological evaluation is especially useful when combined with tests of muscle function. This unit describes a protocol for necropsy, processing, cryosectioning, and histopathological evaluation of murine skeletal muscles, which is applicable to both models of muscular dystrophy and other neuromuscular conditions...
December 1, 2016: Current Protocols in Mouse Biology
https://www.readbyqxmd.com/read/27906453/syk-inhibition-blocks-airway-constriction-and-protects-from-th2-induced-airway-inflammation-and-remodeling-in-mice
#3
Christoph Tabeling, Julia Herbert, Andreas C Hocke, David Lamb, Lutz Wollin, Klaus Erb, Ekaterina Boiarina, Hesam Movassagh, Jörg Scheffel, Jan M Doehn, Stefan Hippenstiel, Marcus Maurer, Abdelilah S Gounni, Wolfgang M Kuebler, Norbert Suttorp, Martin Witzenrath
BACKGROUND: Spleen tyrosine kinase (Syk) is an intracellular non-receptor tyrosine kinase, which has been implicated as central immune modulator promoting allergic airway inflammation. Syk inhibition has been proposed as a new therapeutic approach in asthma. However, the direct effects of Syk inhibition on airway constriction independent of allergen sensitization remain elusive. METHODS: Spectral confocal microscopy of human and murine lung tissue was performed to localize Syk expression...
December 1, 2016: Allergy
https://www.readbyqxmd.com/read/27906172/inflammatory-macrophages-can-transdifferentiate-into-myofibroblasts-during-renal-fibrosis
#4
Xiao-Ming Meng, Shuang Wang, Xiao-Ru Huang, Chen Yang, Jun Xiao, Yang Zhang, Ka-Fai To, David J Nikolic-Paterson, Hui-Yao Lan
Myofibroblasts play a central role in renal fibrosis although the origin of these cells remains controversial. We recently reported that bone marrow-derived macrophages can give rise to myofibroblasts through macrophage to myofibroblast transition (MMT). However, several important issues remain to be addressed, including whether MMT occurs in human kidney disease and verification of the MMT process through lineage tracing. Biopsies from a cohort of 58 patients with various forms of kidney disease were examined for MMT cells that co-express macrophage (CD68) and myofibroblast (α-smooth muscle actin, α-SMA) markers...
December 1, 2016: Cell Death & Disease
https://www.readbyqxmd.com/read/27906130/braf-activates-pax3-to-control-muscle-precursor-cell-migration-during-forelimb-muscle-development
#5
Jaeyoung Shin, Shuichi Watanabe, Soraya Hoelper, Marcus Krüger, Sawa Kostin, Jochen Pöling, Thomas Kubin, Thomas Braun
Migration of skeletal muscle precursor cells is a key step during limb muscle development and depends on the activity of PAX3 and MET. Here, we demonstrate that BRAF serves a crucial function in formation of limb skeletal muscles during mouse embryogenesis downstream of MET and acts as a potent inducer of myoblast cell migration. We found that a fraction of BRAF accumulates in the nucleus after activation and endosomal transport to a perinuclear position. Mass spectrometry based screening for potential interaction partners revealed that BRAF interacts and phosphorylates PAX3...
December 1, 2016: ELife
https://www.readbyqxmd.com/read/27906129/the-evolutionary-origin-of-bilaterian-smooth-and-striated-myocytes
#6
Thibaut Brunet, Antje Hl Fischer, Patrick Rh Steinmetz, Antonella Lauri, Paola Bertucci, Detlev Arendt
The dichotomy between smooth and striated myocytes is fundamental for bilaterian musculature, but its evolutionary origin is unsolved. In particular, interrelationships of visceral smooth muscles remain unclear. Absent in fly and nematode, they have not yet been characterized molecularly outside vertebrates. Here, we characterize expression profile, ultrastructure, contractility and innervation of the musculature in the marine annelid Platynereis dumerilii and identify smooth muscles around the midgut, hindgut and heart that resemble their vertebrate counterparts in molecular fingerprint, contraction speed, and nervous control...
December 1, 2016: ELife
https://www.readbyqxmd.com/read/27906116/embracing-change-striated-for-smooth-muscle-replacement-in-esophagus-development
#7
REVIEW
Robert S Krauss, Daisuke Chihara, Anthony I Romer
The esophagus functions to transport food from the oropharyngeal region to the stomach via waves of peristalsis and transient relaxation of the lower esophageal sphincter. The gastrointestinal tract, including the esophagus, is ensheathed by the muscularis externa (ME). However, while the ME of the gastrointestinal tract distal to the esophagus is exclusively smooth muscle, the esophageal ME of many vertebrate species comprises a variable amount of striated muscle. The esophageal ME is initially composed only of smooth muscle, but its developmental maturation involves proximal-to-distal replacement of smooth muscle with striated muscle...
August 8, 2016: Skeletal Muscle
https://www.readbyqxmd.com/read/27906115/established-cell-surface-markers-efficiently-isolate-highly-overlapping-populations-of-skeletal-muscle-satellite-cells-by-fluorescence-activated-cell-sorting
#8
Claire C Maesner, Albert E Almada, Amy J Wagers
BACKGROUND: Fluorescent-activated cell sorting (FACS) has enabled the direct isolation of highly enriched skeletal muscle stem cell, or satellite cell, populations from postnatal tissue. Several distinct surface marker panels containing different positively selecting surface antigens have been used to distinguish muscle satellite cells from other non-myogenic cell types. Because functional and transcriptional heterogeneity is known to exist within the satellite cell population, a direct comparison of results obtained in different laboratories has been complicated by a lack of clarity as to whether commonly utilized surface marker combinations select for distinct or overlapping subsets of the satellite cell pool...
November 8, 2016: Skeletal Muscle
https://www.readbyqxmd.com/read/27906114/p38%C3%AE-mapk-disables-kmt1a-mediated-repression-of-myogenic-differentiation-program
#9
Biswanath Chatterjee, David W Wolff, Mathivanan Jothi, Munmun Mal, Asoke K Mal
BACKGROUND: Master transcription factor MyoD can initiate the entire myogenic gene expression program which differentiates proliferating myoblasts into multinucleated myotubes. We previously demonstrated that histone methyltransferase KMT1A associates with and inhibits MyoD in proliferating myoblasts, and must be removed to allow differentiation to proceed. It is known that pro-myogenic signaling pathways such as PI3K/AKT and p38α MAPK play critical roles in enforcing associations between MyoD and transcriptional activators, while removing repressors...
August 22, 2016: Skeletal Muscle
https://www.readbyqxmd.com/read/27906113/dystrophin-restoration-therapy-improves-both-the-reduced-excitability-and-the-force-drop-induced-by-lengthening-contractions-in-dystrophic-mdx-skeletal-muscle
#10
Pauline Roy, Fredérique Rau, Julien Ochala, Julien Messéant, Bodvael Fraysse, Jeanne Lainé, Onnik Agbulut, Gillian Butler-Browne, Denis Furling, Arnaud Ferry
BACKGROUND: The greater susceptibility to contraction-induced skeletal muscle injury (fragility) is an important dystrophic feature and tool for testing preclinic dystrophin-based therapies for Duchenne muscular dystrophy. However, how these therapies reduce the muscle fragility is not clear. METHODS: To address this question, we first determined the event(s) of the excitation-contraction cycle which is/are altered following lengthening (eccentric) contractions in the mdx muscle...
July 20, 2016: Skeletal Muscle
https://www.readbyqxmd.com/read/27906112/chromatin-wide-and-transcriptome-profiling-integration-uncovers-p38%C3%AE-mapk-as-a-global-regulator-of-skeletal-muscle-differentiation
#11
Jessica Segalés, Abul B M M K Islam, Roshan Kumar, Qi-Cai Liu, Pedro Sousa-Victor, F Jeffrey Dilworth, Esteban Ballestar, Eusebio Perdiguero, Pura Muñoz-Cánoves
BACKGROUND: Extracellular stimuli induce gene expression responses through intracellular signaling mediators. The p38 signaling pathway is a paradigm of the mitogen-activated protein kinase (MAPK) family that, although originally identified as stress-response mediator, contributes to establishing stem cell differentiation fates. p38α is central for induction of the differentiation fate of the skeletal muscle stem cells (satellite cells) through not fully characterized mechanisms. METHODS: To investigate the global gene transcription program regulated by p38α during satellite cell differentiation (myogenesis), and to specifically address whether this regulation occurs through direct action of p38α on gene promoters, we performed a combination of microarray gene expression and genome-wide binding analyses...
March 15, 2016: Skeletal Muscle
https://www.readbyqxmd.com/read/27906111/the-functional-significance-of-the-skeletal-muscle-clock-lessons-from-bmal1-knockout-models
#12
REVIEW
Stefano Schiaffino, Bert Blaauw, Kenneth A Dyar
The circadian oscillations of muscle genes are controlled either directly by the intrinsic muscle clock or by extrinsic factors, such as feeding, hormonal signals, or neural influences, which are in turn regulated by the central pacemaker, the suprachiasmatic nucleus of the hypothalamus. A unique feature of circadian rhythms in skeletal muscle is motor neuron-dependent contractile activity, which can affect the oscillation of a number of muscle genes independently of the muscle clock. The role of the intrinsic muscle clock has been investigated using different Bmal1 knockout (KO) models...
October 13, 2016: Skeletal Muscle
https://www.readbyqxmd.com/read/27906110/failed-upregulation-of-tfam-protein-and-mitochondrial-dna-in-oxidatively-deficient-fibers-of-chronic-obstructive-pulmonary-disease-locomotor-muscle
#13
Yana Konokhova, Sally Spendiff, R Thomas Jagoe, Sudhakar Aare, Sophia Kapchinsky, Norah J MacMillan, Paul Rozakis, Martin Picard, Mylène Aubertin-Leheudre, Charlotte H Pion, Jean Bourbeau, Russell T Hepple, Tanja Taivassalo
BACKGROUND: Low mitochondrial content and oxidative capacity are well-established features of locomotor muscle dysfunction, a prevalent and debilitating systemic occurrence in patients with chronic obstructive pulmonary disease (COPD). Although the exact cause is not firmly established, physical inactivity and oxidative stress are among the proposed underlying mechanisms. Here, we assess the impact of COPD pathophysiology on mitochondrial DNA (mtDNA) integrity, biogenesis, and cellular oxidative capacity in locomotor muscle of COPD patients and healthy controls...
February 18, 2016: Skeletal Muscle
https://www.readbyqxmd.com/read/27906108/heme-oxygenase-and-carbon-monoxide-protect-from-muscle-dystrophy
#14
Mun Chun Chan, Olivia Ziegler, Laura Liu, Glenn C Rowe, Saumya Das, Leo E Otterbein, Zoltan Arany
BACKGROUND: Duchenne muscle dystrophy (DMD) is one of the most common lethal genetic diseases of children worldwide and is 100% fatal. Steroids, the only therapy currently available, are marred by poor efficacy and a high side-effect profile. New therapeutic approaches are urgently needed. METHODS: Here, we leverage PGC-1α, a powerful transcriptional coactivator known to protect against dystrophy in the mdx murine model of DMD, to search for novel mechanisms of protection against dystrophy...
November 28, 2016: Skeletal Muscle
https://www.readbyqxmd.com/read/27906106/loss-of-niche-satellite-cell-interactions-in-syndecan-3-null-mice-alters-muscle-progenitor-cell-homeostasis-improving-muscle-regeneration
#15
Addolorata Pisconti, Glen B Banks, Farshad Babaeijandaghi, Nicole Dalla Betta, Fabio M V Rossi, Jeffrey S Chamberlain, Bradley B Olwin
BACKGROUND: The skeletal muscle stem cell niche provides an environment that maintains quiescent satellite cells, required for skeletal muscle homeostasis and regeneration. Syndecan-3, a transmembrane proteoglycan expressed in satellite cells, supports communication with the niche, providing cell interactions and signals to maintain quiescent satellite cells. RESULTS: Syndecan-3 ablation unexpectedly improves regeneration in repeatedly injured muscle and in dystrophic mice, accompanied by the persistence of sublaminar and interstitial, proliferating myoblasts...
October 4, 2016: Skeletal Muscle
https://www.readbyqxmd.com/read/27906103/progressive-impairment-of-cav1-1-function-in-the-skeletal-muscle-of-mice-expressing-a-mutant-type-1-cu-zn-superoxide-dismutase-g93a-linked-to-amyotrophic-lateral-sclerosis
#16
Donald Beqollari, Christin F Romberg, Gabriella Dobrowolny, Martina Martini, Andrew A Voss, Antonio Musarò, Roger A Bannister
BACKGROUND: Amyotrophic lateral sclerosis (ALS) is an adult-onset neurodegenerative disorder that is typically fatal within 3-5 years of diagnosis. While motoneuron death is the defining characteristic of ALS, the events that underlie its pathology are not restricted to the nervous system. In this regard, ALS muscle atrophies and weakens significantly before presentation of neurological symptoms. Since the skeletal muscle L-type Ca(2+) channel (CaV1.1) is a key regulator of both mass and force, we investigated whether CaV1...
June 23, 2016: Skeletal Muscle
https://www.readbyqxmd.com/read/27906101/characterization-of-a-dmd-egfp-reporter-mouse-as-a-tool-to-investigate-dystrophin-expression
#17
Mina V Petkova, Susanne Morales-Gonzales, Karima Relizani, Esther Gill, Franziska Seifert, Josefine Radke, Werner Stenzel, Luis Garcia, Helge Amthor, Markus Schuelke
BACKGROUND: Dystrophin is a rod-shaped cytoplasmic protein that provides sarcolemmal stability as a structural link between the cytoskeleton and the extracellular matrix via the dystrophin-associated protein complex (DAPC). Mutations in the dystrophin-encoding DMD gene cause X-linked dystrophinopathies with variable phenotypes, the most severe being Duchenne muscular dystrophy (DMD) characterized by progressive muscle wasting and fibrosis. However, dystrophin deficiency does not only impair the function of skeletal and heart muscle but may also affect other organ systems such as the brain, eye, and gastrointestinal tract...
July 5, 2016: Skeletal Muscle
https://www.readbyqxmd.com/read/27906098/direct-reprogramming-of-urine-derived-cells-with-inducible-myod-for-modeling-human-muscle-disease
#18
Ellis Y Kim, Patrick Page, Lisa M Dellefave-Castillo, Elizabeth M McNally, Eugene J Wyatt
BACKGROUND: Cellular models of muscle disease are taking on increasing importance with the large number of genes and mutations implicated in causing myopathies and the concomitant need to test personalized therapies. Developing cell models relies on having an easily obtained source of cells, and if the cells are not derived from muscle itself, a robust reprogramming process is needed. Fibroblasts are a human cell source that works well for the generation of induced pluripotent stem cells, which can then be differentiated into cardiomyocyte lineages, and with less efficiency, skeletal muscle-like lineages...
September 15, 2016: Skeletal Muscle
https://www.readbyqxmd.com/read/27906092/alterations-to-mtorc1-signaling-in-the-skeletal-muscle-differentially-affect-whole-body-metabolism
#19
Maitea Guridi, Barbara Kupr, Klaas Romanino, Shuo Lin, Denis Falcetta, Lionel Tintignac, Markus A Rüegg
BACKGROUND: The mammalian target of rapamycin complex 1 (mTORC1) is a central node in a network of signaling pathways controlling cell growth and survival. This multiprotein complex integrates external signals and affects different nutrient pathways in various organs. However, it is not clear how alterations of mTORC1 signaling in skeletal muscle affect whole-body metabolism. RESULTS: We characterized the metabolic phenotype of young and old raptor muscle knock-out (RAmKO) and TSC1 muscle knock-out (TSCmKO) mice, where mTORC1 activity in skeletal muscle is inhibited or constitutively activated, respectively...
March 21, 2016: Skeletal Muscle
https://www.readbyqxmd.com/read/27906090/muscle-specific-deletion-of-socs3-increases-the-early-inflammatory-response-but-does-not-affect-regeneration-after-myotoxic-injury
#20
Kristy Swiderski, Savant S Thakur, Timur Naim, Jennifer Trieu, Annabel Chee, David I Stapleton, René Koopman, Gordon S Lynch
BACKGROUND: Muscles of old animals are injured more easily and regenerate poorly, attributed in part to increased levels of circulating pro-inflammatory cytokines. The Janus kinase/signal transducers and activators of transcription (JAK/STAT) signaling cascade is a key mediator of inflammatory cytokine action, and signaling via this pathway is increased in muscles with aging. As a negative regulator of JAK/STAT signaling, a key mediator of myogenic proliferation and differentiation, altered expression of suppressor of cytokine signaling (SOCS3) is likely to have important consequences for muscle regeneration...
October 24, 2016: Skeletal Muscle
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