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https://www.readbyqxmd.com/read/29331478/comprehensive-analysis-of-lncrnas-and-mrnas-with-associated-co-expression-and-cerna-networks-in-c2c12-myoblasts-and-myotubes
#1
Rui Chen, Ting Jiang, Yanling She, Sidong Xie, Shanyao Zhou, Cheng Li, Jun Ou, Yulin Liu
Long non-coding RNAs (lncRNAs) are emerging as important regulators in the modulation of muscle development and muscle-related diseases. To explore potential regulators of muscle differentiation, we determined the expression profiles of lncRNAs and mRNAs in C2C12 mouse myoblast cell line using microarray analysis. Gene ontology and Kyoto Encyclopedia of Genes and Genomes pathway enrichment analyses were performed to explore their function. We also constructed co-expression, cis/trans-regulation, and competing endogenous RNA (ceRNA) networks with bioinformatics methods...
January 10, 2018: Gene
https://www.readbyqxmd.com/read/29330446/effect-of-puerarin-in-promoting-fatty-acid-oxidation-by-increasing-mitochondrial-oxidative-capacity-and-biogenesis-in-skeletal-muscle-in-diabetic-rats
#2
Xiu-Fang Chen, Lei Wang, Yong-Zheng Wu, Shi-Yu Song, Hai-Yan Min, Yan Yang, Xuan He, Qiao Liang, Long Yi, Yong Wang, Qian Gao
BACKGROUND: Type 2 diabetes is characterized by dyslipidemia and the accumulation of lipids in non-adipose tissue, including skeletal muscle. Puerarin, which is a natural isoflavonoid isolated from the root of the plant Pueraria lobata, has been shown to have antidiabetic activity. However, the lipid-reducing effect of puerarin, in particular in skeletal muscle, has not yet been addressed. METHODS: We examined the effect of puerarin on mitochondrial function and the oxidation of fatty acids in the skeletal muscle of high-fat diet/streptozotocin-induced diabetic rats...
January 12, 2018: Nutrition & Diabetes
https://www.readbyqxmd.com/read/29330311/necrosis-in-anti-srp-and-anti-hmgcr-myopathies-role-of-autoantibodies-and-complement
#3
Yves Allenbach, Louiza Arouche-Delaperche, Corinna Preusse, Helena Radbruch, Gillian Butler-Browne, Nicolas Champtiaux, Kuberaka Mariampillai, Aude Rigolet, Peter Hufnagl, Norman Zerbe, Damien Amelin, Thierry Maisonobe, Sarah Louis-Leonard, Charles Duyckaerts, Bruno Eymard, Hans-Hilmar Goebel, Cecile Bergua, Laurent Drouot, Olivier Boyer, Olivier Benveniste, Werner Stenzel
OBJECTIVE: To characterize muscle fiber necrosis in immune-mediated necrotizing myopathies (IMNM) with anti-signal recognition particle (SRP) or anti-3-hydroxy-3-methylglutarylcoenzyme A reductase (HMGCR) antibodies and to explore its underlying molecular immune mechanisms. METHODS: Muscle biopsies from patients with IMNM were analyzed and compared to biopsies from control patients with myositis. In addition to immunostaining and reverse transcription PCR on muscle samples, in vitro immunostaining on primary muscle cells was performed...
January 12, 2018: Neurology
https://www.readbyqxmd.com/read/29329560/overexpression-of-the-double-homeodomain-protein-dux4c-interferes-with-myofibrillogenesis-and-induces-clustering-of-myonuclei
#4
Céline Vanderplanck, Alexandra Tassin, Eugénie Ansseau, Sébastien Charron, Armelle Wauters, Céline Lancelot, Kelly Vancutsem, Dalila Laoudj-Chenivesse, Alexandra Belayew, Frédérique Coppée
BACKGROUND: Facioscapulohumeral muscular dystrophy (FSHD) is associated with DNA hypomethylation at the 4q35 D4Z4 repeat array. Both the causal gene DUX4 and its homolog DUX4c are induced. DUX4c is immunodetected in every myonucleus of proliferative cells, while DUX4 is present in only 1/1000 of myonuclei where it initiates a gene deregulation cascade. FSHD primary myoblasts differentiate into either atrophic or disorganized myotubes. DUX4 expression induces atrophic myotubes and associated FSHD markers...
January 12, 2018: Skeletal Muscle
https://www.readbyqxmd.com/read/29329354/palmitate-induced-er-stress-and-inhibition-of-protein-synthesis-in-cultured-myotubes-does-not-require-toll-like-receptor-4
#5
Ben D Perry, Jill A Rahnert, Yang Xie, Bin Zheng, Myra E Woodworth-Hobbs, S Russ Price
Saturated fatty acids, such as palmitate, are elevated in metabolically dysfunctional conditions like type 2 diabetes mellitus. Palmitate has been shown to impair insulin sensitivity and suppress protein synthesis while upregulating proteolytic systems in skeletal muscle. Increased sarco/endoplasmic reticulum (ER) stress and subsequent activation of the unfolded protein response may contribute to the palmitate-induced impairment of muscle protein synthesis. In some cell types, ER stress occurs through activation of the Toll-like receptor 4 (TLR4)...
2018: PloS One
https://www.readbyqxmd.com/read/29326365/disruption-of-mitochondria-associated-endoplasmic-reticulum-membranes-mams-integrity-contributes-to-muscle-insulin-resistance-in-mice-and-humans
#6
Emily Tubbs, Stéphanie Chanon, Maud Robert, Nadia Bendridi, Gabriel Bidaux, Marie-Agnès Chauvin, Jingwei Ji-Cao, Christine Durand, Daphné Gauvrit-Ramette, Hubert Vidal, Etienne Lefai, Jennifer Rieusset
Modifications of the interactions between endoplasmic reticulum (ER) and mitochondria, defined as mitochondria-associated membranes (MAMs), were recently involved in the control of hepatic insulin action and glucose homeostasis, but with conflicting results. Whereas skeletal muscle is the primary site of insulin-mediated glucose uptake and the main target for alterations in insulin resistant states, the relevance of MAM integrity in muscle insulin resistance is unknown. Deciphering the importance of MAMs on muscle insulin signaling could help to clarify this controversy...
January 11, 2018: Diabetes
https://www.readbyqxmd.com/read/29324704/dissection-of-myogenic-differentiation-signatures-in-chickens-by-rna-seq-analysis
#7
Tingting Li, Genxi Zhang, Pengfei Wu, Lian Duan, Guohui Li, Qiuhong Liu, Jinyu Wang
A series of elaborately regulated and orchestrated changes in gene expression profiles leads to muscle growth and development. In this study, RNA sequencing was used to profile embryonic chicken myoblasts and fused myotube transcriptomes, long non-coding RNAs (lncRNAs), and messenger RNAs (mRNAs) at four stages of myoblast differentiation. Of a total of 2484 lncRNA transcripts, 2288 were long intergenic non-coding RNAs (lincRNAs) and 198 were antisense lncRNAs. Additionally, 1530 lncRNAs were neighboring 2041 protein-coding genes (<10 kb upstream and downstream) and functionally enriched in several pathways related to skeletal muscle development that have been extensively studied, indicating that these genes may be in cis-regulatory relationships...
January 11, 2018: Genes
https://www.readbyqxmd.com/read/29323161/lack-of-fgf18-causes-abnormal-clustering-of-motor-nerve-terminals-at-the-neuromuscular-junction-with-reduced-acetylcholine-receptor-clusters
#8
Kenyu Ito, Bisei Ohkawara, Hideki Yagi, Hiroaki Nakashima, Mikito Tsushima, Kyotaro Ota, Hiroyuki Konishi, Akio Masuda, Shiro Imagama, Hiroshi Kiyama, Naoki Ishiguro, Kinji Ohno
FGF receptor 2 is involved in the formation of the neuromuscular junction (NMJ), but its in vivo ligand remains to be determined. Laser capture microdissection of the mouse spinal motor neurons (SMNs) revealed that Fgf18 mRNA is highly expressed in SMNs in adults. Expression of Fgf18 mRNA was the highest in the spinal cord at embryonic day (E) 15.5, which gradually decreased to postnatal day 7. FGF18 protein was localized at the NMJs of the tibialis anterior muscle at E18.5 and in adults. Fgf18-/- mice at E18...
January 11, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29318853/-effects-of-electroacupuncture-on-adaptive-hypertrophy-of-gastrocnemius-and-proliferation-and-differentiation-of-muscle-satellite-cells-in-rats
#9
Dan-Dan Zhao, Cheng-Lin Tang, Si-Qin Huang, Ao Luo, An-Ning Zhang, Quan-Hu Guo, Jing Cao, Rui-Qi Gao
OBJECTIVE: To explore the effects and mechanism of different duration electroacupuncture (EA) on adaptive hypertrophy of gastrocnemius and the expressions of proliferation cell nuclear antigen (PCNA), paired box transcription factor 7 (Pax 7), myogenic differentiation antigen (MyoD 1), myogenin (MyoG), myosin heavy chain-Ⅰ(Myh 7), transforming growth factor-β 1 (TGF-β 1), Smad 3 in rats. METHODS: Twenty-four SD adult male rats were randomly divided into normal, two-week EA (A 2), four-week EA (A 4) and eight-week EA (A 8) groups, 6 rats in each group...
December 25, 2017: Zhen Ci Yan Jiu, Acupuncture Research
https://www.readbyqxmd.com/read/29318389/myogenic-potential-of-mesenchymal-stem-cells-isolated-from-porcine-adipose-tissue
#10
Derek J Milner, Massimo Bionaz, Elisa Monaco, Jo Ann Cameron, Matthew B Wheeler
Advances in stem cell biology and materials science have provided a basis for developing tissue engineering methods to repair muscle injury. Among stem cell populations with potential to aid muscle repair, adipose-derived mesenchymal stem cells (ASC) hold great promise. To evaluate the possibility of using porcine ASC for muscle regeneration studies, we co-cultured porcine ASC with murine C2C12 myoblasts. These experiments demonstrated that porcine ASC display significant myogenic potential. Co-culture of ASC expressing green fluorescent protein (GFP) with C2C12 cells resulted in GFP+ myotube formation, indicating fusion of ASC with myoblasts to form myotubes...
January 9, 2018: Cell and Tissue Research
https://www.readbyqxmd.com/read/29317646/engineering-human-pluripotent-stem-cells-into-a-functional-skeletal-muscle-tissue
#11
Lingjun Rao, Ying Qian, Alastair Khodabukus, Thomas Ribar, Nenad Bursac
The generation of functional skeletal muscle tissues from human pluripotent stem cells (hPSCs) has not been reported. Here, we derive induced myogenic progenitor cells (iMPCs) via transient overexpression of Pax7 in paraxial mesoderm cells differentiated from hPSCs. In 2D culture, iMPCs readily differentiate into spontaneously contracting multinucleated myotubes and a pool of satellite-like cells endogenously expressing Pax7. Under optimized 3D culture conditions, iMPCs derived from multiple hPSC lines reproducibly form functional skeletal muscle tissues (iSKM bundles) containing aligned multi-nucleated myotubes that exhibit positive force-frequency relationship and robust calcium transients in response to electrical or acetylcholine stimulation...
January 9, 2018: Nature Communications
https://www.readbyqxmd.com/read/29314416/transient-microrna-expression-enhances-myogenic-potential-of-mouse-embryonic-stem-cells
#12
Joanna Bem, Iwona Grabowska, Maciej Daniszewski, Dorota Zawada, Areta Czerwinska, Lukasz Bugajski, Katarzyna Piwocka, Anna Fogtman, Maria A Ciemerych
MicroRNAs (miRNAs) are known regulators of various cellular processes, including pluripotency and differentiation of embryonic stem cells (ESCs). We analyzed differentiation of two ESC lines - D3 and B8, and observed significant differences in the expression of miRNAs and genes involved in pluripotency and differentiation. We also examined if transient miRNA overexpression could serve as a sufficient impulse modulating differentiation of mouse ESCs. ESCs were transfected with miRNA Mimics and differentiated in embryoid bodies and embryoid body outgrowths...
January 4, 2018: Stem Cells
https://www.readbyqxmd.com/read/29310935/degradation-of-brown-adipocyte-purine-nucleotides-regulates-uncoupling-protein-1-activity
#13
Tobias Fromme, Karin Kleigrewe, Andreas Dunkel, Angelika Retzler, Yongguo Li, Stefanie Maurer, Natascha Fischer, Rolf Diezko, Timo Kanzleiter, Verena Hirschberg, Thomas Hofmann, Martin Klingenspor
OBJECTIVE: Non-shivering thermogenesis in mammalian brown adipose tissue depends on thermogenic uncoupling protein 1. Its activity is triggered by free fatty acids while purine nucleotides mediate inhibition. During activation, it is thought that free fatty acids overcome purine-mediated inhibition. We measured the cellular concentration and the release of purine nucleotide metabolites to uncover a possible role of purine nucleotide degradation in uncoupling protein 1 activation. METHODS: With mass spectrometry, purine nucleotide metabolites were quantified in cellular homogenates and supernatants of cultured primary brown adipocytes...
December 26, 2017: Molecular Metabolism
https://www.readbyqxmd.com/read/29300979/high-intensity-exercise-decreases-ip6k1-muscle-content-improves-insulin-sensitivity-si2-in-glucose-intolerant-individuals
#14
Jane Naufahu, Bradley Elliott, Anatoliy Markiv, Petra Dunning-Foreman, Maggie McGrady, David Howard, Peter Watt, Richard W A Mackenzie
Context: Insulin resistance in skeletal muscle contributes to whole body hyperglycaemia and the secondary complications associated with type 2 diabetes. Inositol hexakisphosphate kinase-1 (IP6K1) may inhibit insulin-stimulated glucose transport in this tissue type. Objective: Muscle and plasma IP6K1 were correlated with two-compartment models of glucose control in insulin-resistant hyperinsulimic individuals. Muscle IP6K1 was also compared following two different exercise trials...
December 29, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29290354/palmitate-and-oleate-co-treatment-increases-myocellular-protein-content-via-impaired-protein-degradation
#15
Lance M Bollinger, Marilyn S Campbell, Jeffrey J Brault
OBJECTIVES: Protein balance is a crucial determinant of myocellular size and function. The effects of fatty acids on myocellular protein balance remain controversial. The aim of this study was to determine the direct effects of a mixed-species fatty acid environment on myocellular protein synthesis and degradation. METHODS: C2C12 myotubes were cultured in media containing equimolar (250 μM) palmitic acid and oleate (PO) or bovine serum albumin control for ≤72 h...
February 2018: Nutrition
https://www.readbyqxmd.com/read/29289885/structural-and-biological-characterization-of-new-hybrid-drugs-joining-an-hdac-inhibitor-to-different-no-donors
#16
Sandra Atlante, Konstantin Chegaev, Chiara Cencioni, Stefano Guglielmo, Elisabetta Marini, Emily Borretto, Carlo Gaetano, Roberta Fruttero, Francesco Spallotta, Loretta Lazzarato
HDAC inhibitors and NO donors have already revealed independently their broad therapeutic potential in pathologic contexts. Here we further investigated the power of their combination in a single hybrid molecule. Nitrooxy groups or substituted furoxan derivatives were joined to the α-position of the pyridine ring of the selective class I HDAC inhibitor MS-275. Biochemical analysis showed that the association with the dinitrooxy compound 31 or the furoxan derivative 16 gives hybrid compounds the ability to preserve the single moiety activities...
December 15, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29288771/s-allyl-cysteine-regulates-the-tnf%C3%AE-induced-muscle-wasting-by-suppressing-proteolysis-and-regulating-the-inflammatory-molecules-in-skeletal-muscle-myotubes
#17
Vikas Dutt, Vikram Saini, Prachi Gupta, Nirmaljeet Kaur, Manju Bala, Ravindra Gujar, Anita Grewal, Sanjeev Gupta, Anita Dua, Ashwani Mittal
BACKGROUND: Elevated levels of inflammatory molecules are the key players in muscle wasting/atrophy leading to human morbidity. TNFα is a well-known pro-inflammatory cytokine implicated in the pathogenesis of muscle wasting under diverse clinical settings. S-allyl cysteine (SAC), an active component of garlic (Allium sativum), has established anti-oxidant and anti-inflammatory effects in various cell types. However, the impact of SAC on skeletal muscle pathology remains unexplored. Owing to the known anti-inflammatory properties of SAC, we investigate whether pre-treatment with SAC has a protective role in TNFα induced atrophy in cultured myotubes...
December 27, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29284662/junctional-trafficking-and-restoration-of-retrograde-signaling-by-the-cytoplasmic-ryr1-domain
#18
Alexander Polster, Stefano Perni, Dilyana Filipova, Ong Moua, Joshua D Ohrtman, Hicham Bichraoui, Kurt G Beam, Symeon Papadopoulos
The type 1 ryanodine receptor (RyR1) in skeletal muscle is a homotetrameric protein that releases Ca2+ from the sarcoplasmic reticulum (SR) in response to an "orthograde" signal from the dihydropyridine receptor (DHPR) in the plasma membrane (PM). Additionally, a "retrograde" signal from RyR1 increases the amplitude of the Ca2+ current produced by CaV1.1, the principle subunit of the DHPR. This bidirectional signaling is thought to depend on physical links, of unknown identity, between the DHPR and RyR1. Here, we investigate whether the isolated cytoplasmic domain of RyR1 can interact structurally or functionally with CaV1...
December 28, 2017: Journal of General Physiology
https://www.readbyqxmd.com/read/29280566/%C3%AE-secretase-inhibition-induces-muscle-hypertrophy-in-a-notch-independent-mechanism
#19
Ivone Rosa de Andrade, Stephany Corrêa, Marcio Fontenele, John Douglas de Oliveira Teixeira, Eliana Abdelhay, Manoel Luis Costa, Claudia Mermelstein
A wide variety of cellular processes and signaling events are regulated by the proteolytic enzyme γ-secretase. Notch-1 is one of the substrates of γ-secretase and its role in the regulation of muscle differentiation has been well described. Importantly, besides Notch-1 a number of proteins have been identified to undergo proteolysis by γ-secretase. To date, the specific role of γ-secretase during embryonic skeletal muscle differentiation has not been studied. Therefore, we address this question through the analysis of in vitro grown chick myogenic cells during the formation of multinucleated myotubes...
December 27, 2017: Proteomics
https://www.readbyqxmd.com/read/29278895/aberrant-caspase-activation-in-laminin-%C3%AE-2-deficient-human-myogenic-cells-is-mediated-by-p53-and-sirtuin-activity
#20
Soonsang Yoon, Mary Lou Beermann, Bryant Yu, Di Shao, Markus Bachschmid, Jeffrey Boone Miller
BACKGROUND: Mutations in the LAMA2 gene encoding laminin-α2 cause congenital muscular dystrophy Type 1A (MDC1A), a severe recessive disease with no effective treatment. Previous studies have shown that aberrant activation of caspases and cell death through a pathway regulated by BAX and KU70 is a significant contributor to pathogenesis in laminin-α2-deficiency. OBJECTIVES: To identify mechanisms of pathogenesis in MDC1A. METHODS: We used immunocytochemical and molecular studies of human myogenic cells and mouse muscles-comparing laminin-α2-deficient vs...
December 20, 2017: Journal of Neuromuscular Diseases
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